SIST EN 303 798 V2.1.1:2024
(Main)Intelligent Transport Systems (ITS) - LTE-V2X and NR-V2X Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band - Release 2
Intelligent Transport Systems (ITS) - LTE-V2X and NR-V2X Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band - Release 2
The present document defines the physical layer, the data link layer and radio resource configuration, grouped into the
access layer of the ITS station reference architecture ETSI TS 103 898 [i.2]. The access layer technology that is
specified in the present document refers to what is known as the sidelink or PC5 interface of cellular V2X for the
following frequency bands:
• Operation in frequency band dedicated to ITS for safety related applications in the frequency range 5,875 GHz
to 5,925 GHz.
• Operation in frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to
5,875 GHz.
The present document is a revision of ETSI EN 303 613 [i.1], and extends the LTE-V2X access layer specification to
include NR-V2X.
Whether LTE-V2X or NR-V2X is used for message transmission in an ITS channel is determined by a system level
configuration and outside the scope of the present document.
Inteligentni transportni sistemi (ITS) - Specifikaciji LTE-V2X in NR-V2X dostopovne plasti pri inteligentnih transportnih sistemih, ki delujejo v frekvenčnem pasu 5 GHz, 2. izdaja
Ta dokument določa fizično plast, plast podatkovnih povezav in konfiguracijo radijskih virov, ki so združene v dostopovno plast referenčne arhitekture postaje ITS (ETSI TS 103 898 [i.2]). Tehnologija dostopovne plasti, določena v tem dokumentu, se navezuje na tako imenovano stransko povezavo oziroma vmesnik PC5 mobilne tehnologije V2X za naslednje frekvenčne pasove:
• delovanje v frekvenčnem pasu, namenjenem za ITS, za načine uporabe, povezane z varnostjo, v frekvenčnem območju od 5875 GHz do 5925 GHz;
• delovanje v frekvenčnih pasovih, namenjenih za ITS, za načine uporabe, ki niso povezani z varnostjo, v frekvenčnem območju od 5855 GHz do 5875 GHz.
Ta dokument je revizija standarda ETSI EN 303 613 [i.1] in razširja specifikacijo LTE-V2X dostopovne plasti tako, da vključuje NR-V2X.
Uporaba specifikacije LTE-V2X oziroma NR-V2X za prenos sporočil v kanalu ITS je določena s konfiguracijo na ravni sistema in ne spada na področje uporabe tega dokumenta.
General Information
Standards Content (Sample)
Draft ETSI EN 303 798 V2.0.1 (2023-10)
EUROPEAN STANDARD
Intelligent Transport Systems (ITS);
LTE-V2X and NR-V2X Access layer specification
for Intelligent Transport Systems operating
in the 5 GHz frequency band;
Release 2
2 Draft ETSI EN 303 798 V2.0.1 (2023-10)
Reference
REN/ITS-00446
Keywords
5G, ITS, layer 1, layer 2, LTE, MAC, radio
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ETSI
3 Draft ETSI EN 303 798 V2.0.1 (2023-10)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 9
4 General requirements . 11
4.1 Architecture . 11
4.2 Operating Frequencies . 12
4.3 Transmit and receive requirement . 12
4.4 Congestion control . 12
4.5 CEN DSRC protection . 13
4.6 Channel Configuration . 13
5 LTE-V2X access layers . 13
5.1 Physical layer . 13
5.2 MAC layer . 13
5.3 RLC layer . 13
5.4 PDCP layer . 14
5.5 RRC layer . 14
5.6 NAS layer . 14
5.7 Additional LTE-V2X access layer functionality for PC5 interface . 14
5.7.1 Transmission/reception of LTE-V2X communication over PC5 . 14
5.7.2 QoS management . 14
5.7.3 PC5 parameter provisioning . 14
5.7.4 Synchronization . 14
5.7.5 Compatibility with ETSI EN 303 613. 15
6 NR-V2X access layers. 15
6.1 Physical layer . 15
6.2 MAC layer . 15
6.3 RLC layer . 15
6.4 PDCP layer . 15
6.5 RRC layer . 15
6.6 NAS layer . 15
6.7 Additional NR-V2X access layer functionality for PC5 interface. 16
6.7.1 Transmission/reception of NR-V2X communication over PC5 . 16
6.7.2 QoS management . 16
6.7.3 PC5 parameter provisioning . 16
6.7.4 Synchronization . 16
6.8 Cast Management . 16
Annex A (normative): Information Elements . 17
A.1 LTE-V2X information elements . 17
A.2 NR-V2X information elements . 20
Annex B (normative): List of MCS-RB prohibited cases (LTE-V2X) . 43
History . 45
ETSI
4 Draft ETSI EN 303 798 V2.0.1 (2023-10)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
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essential to the present document.
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Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems
(ITS), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN Approval
Procedure.
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
5 Draft ETSI EN 303 798 V2.0.1 (2023-10)
Introduction
The present document outlines the access layer of the Sidelink (PC5 interface) of cellular based Vehicle to Everything
communication technology specified in ETSI TS 138 300 [21], which can be operated in the 5,9 GHz frequency band
allocated in Europe. NR-V2X and LTE-V2X access layers consist of RRC layer, PDCP layer, RLC layer, MAC layer
and Physical layer. A NAS layer is also introduced as part of the access layer in the present document for the provision
of control. The present document includes requirements for congestion control and for CEN DSRC protection.
The present document was made after the EU Standardization Mandate M/453 [i.7].
While deployment of LTE-V2X and NR-V2X in the same channel could be possible, it is not intended and is outside
the scope of the present document.
The present document does not override regional regulations. The regional regulations apply.
ETSI
6 Draft ETSI EN 303 798 V2.0.1 (2023-10)
1 Scope
The present document defines the physical layer, the data link layer and radio resource configuration, grouped into the
access layer of the ITS station reference architecture ETSI TS 103 898 [i.2]. The access layer technology that is
specified in the present document refers to what is known as the sidelink or PC5 interface of cellular V2X for the
following frequency bands:
• Operation in frequency band dedicated to ITS for safety related applications in the frequency range 5,875 GHz
to 5,925 GHz.
• Operation in frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to
5,875 GHz.
The present document is a revision of ETSI EN 303 613 [i.1], and extends the LTE-V2X access layer specification to
include NR-V2X.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 136 331: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification (3GPP TS 36.331 Release 16)".
[2] ETSI TS 136 300: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved
Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (3GPP
TS 36.300 Release 16)".
[3] ETSI TS 136 321: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access
Control (MAC) protocol specification (3GPP TS 36.321 Release 16)".
[4] ETSI TS 136 322: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link
Control (RLC) protocol specification (3GPP TS 36.322 Release 16)".
[5] ETSI TS 136 323: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data
Convergence Protocol (PDCP) specification (3GPP TS 36.323 Release 16)".
[6] ETSI TS 136 211: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
channels and modulation (3GPP TS 36.211 Release 16)".
[7] ETSI TS 136 212: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing
and channel coding (3GPP TS 36.212 Release 16)".
[8] ETSI TS 136 213: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures (3GPP TS 36.213 Release 16)".
[9] ETSI TS 136 214: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer;
Measurements (3GPP TS 36.214 Release 16)".
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7 Draft ETSI EN 303 798 V2.0.1 (2023-10)
[10] ETSI TS 123 285: "Universal Mobile Telecommunications System (UMTS); LTE; Architecture
enhancements for V2X services (3GPP TS 23.285 Release 16)".
[11] ETSI TS 124 385: "LTE; V2X services Management Object (MO) (3GPP TS 24.385 Release 16)".
[12] ETSI TS 124 386: "LTE; User Equipment (UE) to V2X control function; protocol aspects; Stage 3
(3GPP TS 24.386 Release 16)".
[13] ETSI TS 136 101: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment
(UE) radio transmission and reception (3GPP TS 36.101 Release 16)".
[14] ETSI TS 136 133: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements
for support of radio resource management (3GPP TS 36.133 Release 16)".
[15] ETSI TS 124 301: "Universal Mobile Telecommunications System (UMTS); LTE; 5G;
Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 (3GPP TS 24.301
Release 16)".
[16] ETSI TS 136 413: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
Application Protocol (S1AP) (3GPP TS 36.413 Release 16)".
[17] ETSI TS 136 414: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
data transport (3GPP TS 36.414 Release 16)".
[18] ETSI TS 102 792: "Intelligent Transport Systems (ITS); Mitigation techniques to avoid
interference between European CEN Dedicated Short Range Communication (CEN DSRC)
equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".
[19] ETSI TS 103 574: "Intelligent Transport Systems (ITS); Congestion Control Mechanisms for
C-V2X PC5 interface; Access layer part; Release 2".
[20] ETSI TS 138 331: "5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP
TS 38.331 Release 16)".
[21] ETSI TS 138 300: "5G; NR; NR and NG-RAN Overall description; Stage-2 (3GPP
TS 38.300 Release 16)".
[22] ETSI TS 138 321: "5G; NR; Medium Access Control (MAC) protocol specification (3GPP
TS 38.321 Release 16)".
[23] ETSI TS 138 322: "5G ; NR; Radio Link Control (RLC) protocol specification (3GPP TS 38.322
Release 16)".
[24] ETSI TS 138 323: "5G; NR; Packet Data Convergence Protocol (PDCP) specification (3GPP
TS 38.323 Release 16)".
[25] ETSI TS 138 211: "5G ; NR; Physical channels and modulation (3GPP TS 38.211 Release 16)".
[26] ETSI TS 138 212: "5G; NR; Multiplexing and channel coding (3GPP TS 38.212 Release 16)".
[27] ETSI TS 138 213: "5G; NR; Physical layer procedures for control (3GPP TS 38.213 Release 16)".
[28] ETSI TS 138 214: "5G; NR; Physical layer procedures for data (3GPP TS 38.214 Release 16)".
[29] ETSI TS 138 215: "5G; NR; Physical layer measurements (3GPP TS 38.215 Release 16)".
[30] ETSI TS 138 101-1: "5G; NR; User Equipment (UE) radio transmission and reception; Part 1:
Range 1 Standalone (3GPP TS 38.101-1 Release 16)".
[31] ETSI TS 138 133: "5G; NR; Requirements for support of radio resource management (3GPP
TS 38.133 Release 16)".
[32] ETSI TS 124 501: "5G; Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3
(3GPP TS 24.501 Release 16)".
[33] ETSI TS 138 413: "5G; NG-RAN; NG Application Protocol (NGAP) (3GPP TS 38.413
Release 16)".
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8 Draft ETSI EN 303 798 V2.0.1 (2023-10)
[34] ETSI TS 138 414: "5G; NG-RAN; NG data transport (3GPP TS 38.414 Release 16)".
[35] ETSI TS 103 723: "Intelligent Transport Systems (ITS); Profile for LTE-V2X Direct
Communication".
[36] ETSI TS 123 287: "5G; Architecture enhancements for 5G System (5GS) to support
Vehicle-to-Everything (V2X) services (3GPP TS 23.287 Release 16)".
[37] ETSI TS 103 836-4-3: "Intelligent Transport Systems (ITS) Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 3: Media-dependent functionalities for NR-V2X
PC5 and LTE-V2X PC5; Release 2".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 303 613: "Intelligent Transport Systems (ITS); LTE-V2X Access layer specification for
Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI TS 103 898: "Intelligent Transport Systems (ITS); Communications Architecture;
Release 2".
[i.3] ETSI EN 302 571: "Intelligent Transport Systems (ITS); Radiocommunications equipment
operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonised Standard covering the
essential requirements of article 3.2 of Directive 2014/53/EU".
[i.4] Commission Implementing Decision (EU) 2020/1426 of 7 October 2020 on the harmonised use of
radio spectrum in the 5 875-5 935 MHz frequency band for safety-related applications of
intelligent transport systems (ITS) and repealing Decision 2008/671/EC.
[i.5] ECC/DEC/(08)01: "The harmonised use of Safety-Related Intelligent Transport Systems (ITS) in
the 5875-5935 MHz frequency band". Approved 14 March 2008. Latest updated 18 November
2022.
[i.6] ECC Recommendation (08)01: "Use of the band 5855-5875 MHz for Intelligent Transport
Systems (ITS)". Approved 21 February 2008. Amended 3 July 2015.
[i.7] EU Standardization Mandate M/453: "Standardisation mandate addressed to CEN, CENELEC and
ETSI in the field of Information and Communication Technologies to support the interoperability
of Co-operative systems for Intelligent Transport in the European Community".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI TS 103 898 [i.2] and the following apply:
channel busy ratio: portion of sub-channels in the resource pool whose S-RSSI measured by the ITS station exceed a
(pre-)configured threshold sensed over last 100 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9] and is different to the
definition in ETSI EN 302 571 [i.3].
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9 Draft ETSI EN 303 798 V2.0.1 (2023-10)
channel occupancy ratio: fraction of the total number of sub-channels used by the ITS station for its transmissions out
of the total number of configured (granted) sub-channels over a measurement period of 1 000 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9].
PC5: interface between the ITS stations used for C-V2X sidelink communication
Resource Block (RB): 7 consecutive symbols in the time domain and 12 consecutive subcarriers in the frequency
domain
resource pool: set of resources that can be used for PSCCH and PSSCH
NOTE: Resource pool is defined with the help of start RB, number of sub-channels, size of sub-channel and
available subframes.
sidelink: radio link between the ITS stations for C-V2X direct communication
sub-channel: set of contiguous physical resource blocks
3.2 Symbols
For the purposes of the present document, the following symbols apply:
IN Interface between access layer and networking & transport layer
IN-SAP Interface between access layer and network & transport layer
MF Interface between management entity and facilities layer
MI Interface between management entity and access layer
MN Interface between management entity and networking & transport layer
MS Interface between management entity and security entity
NF Interface between networking & transport layer and facilities layer
SF Interface between security entity and facilities layer
SI Interface between security entity and access layer
SN Interface between security entity and networking & transport layer
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
rd
3GPP 3 Generation Partnership Project
ACK Acknowledgement
AM Acknowledged Mode
API Application Programming Interface
ARFCN Absolute Radio-Frequency Channel Number
ASN.1 Abstract Syntax Notation One
BSR Buffer Status Report
BW Bandwidth
BWP Bandwidth Part
CBR Channel Busy Ratio
CEN Comité Européen de Normalisation
CID Context Identifier
CN Core Network
CR Channel Occupancy Ratio
CSI Channel State Information
C-V2X Cellular Vehicle to Everything
DFN Direct Frame Number
DL Downlink
DMRS Demodulation Reference Signal
DRB Data Radio Bearer
DSRC Dedicated Short Range Communications
DTX Discontinuous Transmission
eNB enhance Node B
E-UTRA Evolved Universal Terrestrial Radio Access
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10 Draft ETSI EN 303 798 V2.0.1 (2023-10)
E-UTRAN Evolved Universal Terrestrial Radio Access Network
FR1 Frequency 1
FR2 Frequency 2
GBR Guaranteed Bit Rate
GFBR Guaranteed Flow Bit Rate
gNB 5G Node B
GNSS Global Navigation Satellite System
HARQ Hybrid Automatic Repeat Request
ID Identity
IE Information Element
IP Internet Protocol
ITS Intelligent Transport Systems
LCP Link Control Protocol
LTE-V2X Long Term Evolution based Vehicle-to-Everything
M/R Mandatory/Recommended
MAC Medium Access Control
MCS Modulation and Coding Scheme
MCS-RB Modulation and Coding Scheme - Resource Blocks
MFBR Maximum Flow Bit Rate
MIB-SL Master Information Block - Sidelink
N/A Not Applicable
NAS Non-Access Stratum
NR New Radio
th
NR-V2X New Radio (5 generation) Vehicle to Everything
NS Network Signalling value
PC5 Proximity-based Communication (Interface) 5
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
PHY PHYsical layer
PPPP ProSe Per-Packet Priority
PQI PC5 QoS Identifier
PRB Physical Resource Block
ProSe Proximity-based Service
PSBCH Physical Sidelink Broadcast Channel
PSCCH Physical Sidelink Control Channel
PSFCH Physical Sidelink Feedback Channel
PSSCH Physical Sidelink Shared Channel
PTRS Phase Tracking Reference Signal
PUCCH Physical Uplink Control Channel
PUSCH Physical Uplink Shared Channel
QAM Quadrature Amplitude Modulation
QoS Quality of Service
RAN Radio Access Network
RB Resource Block
RLC Radio Link Control
RLF Radio Link Failure
RoHC Robust Header Compression
RRC Radio Resource Control
RSRP Reference Signal Received Power
RSSI Received Signal Strength Indication
RSU Road Side Unit
SCI Sidelink Control Information
SCS Sub Carrier Spacing
SDAP Service Data Adaptation Protocol
SDU Service Data Unit
SFN Sub Frame Number
SLSS Sidelink Synchronization Signal
SL-SSB Sidelink Synchronization Signal Block
SN Sequence Number
SPS Semi Persistent Scheduling
S-PSS (Sidelink) Primary Synchronization Signal
S-SSS (Sidelink) Secondary Synchronization Signal
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11 Draft ETSI EN 303 798 V2.0.1 (2023-10)
SSID Service Set ID
SyncRef UE Synchronization Reference User Equipment
TB Transport Block
TDD Time Division Duplex
TX Transmit
UCI Uplink Control Information
UE User Equipment
UL Uplink
UM Unacknowledged Mode
V2X Vehicle-to-Everything
4 General requirements
4.1 Architecture
The ITS station architecture specified in ETSI TS 103 898 [i.2] is in Figure 4.1.1. LTE-V2X as defined in ETSI
TS 136 300 [2] and NR-V2X as defined in ETSI TS 138 300 [21] are two of the access layer technologies of the ITS
station architecture.
Figure 4.1.1: ITS station architecture
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12 Draft ETSI EN 303 798 V2.0.1 (2023-10)
A C-V2X access layer is shown in Figure 4.1.2.
IN-SAP
PDCP
RLC
MAC
PHY
C-V2X Access Layer in ITS Station
Figure 4.1.2: C-V2X Access Layer protocol stack
An ITS station that includes a cellular V2X technology as the access layer shall support LTE-V2X sidelink
communication as defined in ETSI TS 136 300 [2], or NR-V2X sidelink communication as defined in ETSI
TS 138 300 [21], or both. LTE-V2X and NR-V2X are different access layers.
NOTE: The present document specifies LTE-V2X and NR-V2X based on 3GPP Release-16 and contains no
backwards compatibility requirements other than those explicitly stated in clause 5.7.5.
4.2 Operating Frequencies
ETSI TS 136 101 [13], clause 5.5G defines the operating band of LTE-V2X.
ETSI TS 138 101-1 [30], clause 5.2E defines the operating bands of NR-V2X.
In Europe, ITS frequency band designation for 5 855 MHz to 5 925 MHz is defined by Commission Implementing
Decision (EU) 2020/1426 [i.4], ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
Band 47 in ETSI TS 136 101 [13] and band n47 in ETSI TS 138 101-1 [30] correspond to the European ITS spectrum
in 5 855 MHz to 5 925 MHz as defined by Commission Implementing Decision (EU) 2020/1426 [i.4],
ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
4.3 Transmit and receive requirement
An ITS station using LTE-V2X shall fulfil the transmit and receive requirement defined for Band 47 in ETSI
TS 136 101 [13] and ETSI TS 136 133 [14].
An ITS station using NR-V2X shall fulfil the transmit and receive requirement defined for Band n47 in ETSI
TS 138 101-1 [30] and ETSI TS 138 133 [31].
4.4 Congestion control
A C-V2X ITS station shall adapt its CR according to the measured Channel Busy Ratio (CBR) in order to comply with
the required CR limit, as defined in ETSI TS 103 574 [19]. The CBR measurement window shall be as specified in
ETSI TS 103 574 [19] for LTE-V2X and Table A.2.1 row 36 for NR-V2X.
ETSI
MI-SAP
Management
NAS
RRC
13 Draft ETSI EN 303 798 V2.0.1 (2023-10)
4.5 CEN DSRC protection
An ITS station using LTE-V2X in Band 47 or NR-V2X in Band n47 shall avoid harmful interference to CEN DSRC:
The ITS station shall be conformant to ETSI TS 102 792 [18].
If the ITS station is inside the protected zone, it shall adjust its output power level to maximum 10 dBm e.i.r.p.
If the ITS station is inside the protected zone, it shall fulfil the spurious emissions limit of maximum
-65 dBm/MHz within 5 795 MHz to 5 815 MHz.
An ITS station using LTE-V2X or NR-V2X in Band n47 shall avoid harmful interference to CEN DSRC.
The ITS station shall be conformant to ETSI TS 102 792 [18].
If the ITS station is inside the protected zone, it shall adjust its output power level to maximum 10 dBm e.i.r.p. If the
ITS station is inside the protected zone, it shall fulfil the spurious emissions limit of maximum -65 dBm/MHz within
5 795 MHz to 5 815 MHz.
The upper layers of the ITS station are responsible for detecting that the ITS station is within proximity of CEN DSRC
protection zone and then sending an indication to access layers to trigger power level adjustment.
4.6 Channel Configuration
The operation of NR-V2X or LTE-V2X in the overlap of 10 MHz channels with 20 MHz channels is not specified in
the present document.
NOTE: Operation in the overlap of 10 MHz channels with 20 MHz channels is not intended and is out of scope of
the present document.
5 LTE-V2X access layers
5.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 136 211 [6], ETSI TS 136 212 [7], ETSI TS 136 213 [8] and ETSI TS 136 214 [9].
The minimum set of the essential LTE-V2X information elements defined in ETSI TS 136 331 [1] and their
default/initial values shall be as in clause A.1, Tables A.1.1 to A.1.6.
Additionally, for Rel-16 PSSCH transmission, MCS-RB problematic configurations listed in Annex B shall be
excluded.
5.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for LTE-V2X sidelink
communications, and shall be as defined in ETSI TS 136 321 [3].
NOTE: There are two normal modes of channel access in LTE-V2X:
Semi-Persistent Scheduling (SPS).
Event-Based (known as One-Shot).
5.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 136 322 [4].
ETSI
14 Draft ETSI EN 303 798 V2.0.1 (2023-10)
5.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP), and shall be as defined in ETSI TS 136 323 [5].
5.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 136 331 [1].
5.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 301 [15].
5.7 Additional LTE-V2X access layer functionality for PC5
interface
5.7.1 Transmission/reception of LTE-V2X communication over PC5
Additional LTE-V2X access layer functionality for transmission/reception of LTE-V2X communication over PC5 shall
be compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
5.7.2 QoS management
An ITS station using LTE-V2X shall (de)prioritize a data packet according to its PPPP value in access layer as defined
in ETSI TS 136 331 [1] and ETSI TS 136 213 [8].
5.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform LTE-V2X Communication shall be as defined in ETSI
TS 123 285 [10], ETSI TS 123 287 [36], ETSI TS 136 413 [16], ETSI TS 136 414 [17] and ETSI TS 103 574 [19].
5.7.4 Synchronization
An ITS station using LTE-V2X shall synchronize with a synchronization reference (e.g. GNSS) in both time and
frequency before communicating with other ITS stations using LTE-V2X. The Synchronization related functionality of
an ITS station using LTE-V2X shall be compliant with ETSI TS 136 331 [1].
For the scenario where ITS station selects synchronization reference on the sidelink (PC5 interface), whether to
(pre-)configure syncOffsetIndicators as defined in ETSI TS 136 331 [1] shall be according to different regions/nations'
implementation. For the case where syncOffsetIndicators is not (pre-)configured, at least RSU ITS station shall be
allowed to transmit sidelink synchronization signalling on the subframes that are not configured to transmit LTE-V2X
messages, e.g. including the reserved subframes calculated according to ETSI TS 136 213 [8] and the subframes
indicated as "0" in sl-Subframe of the transmission pool as per ETSI TS 136 331 [1].
NOTE 1: From transmission-side perspective, whether or not to transmit sidelink synchronization signalling is
based on the ITS station's capability.
NOTE 2: From reception-side perspective, for the case where syncOffsetIndicators is not provided, the parameters
used for sidelink synchronization signalling measurement such as filterCoefficient, syncRefMinHyst and
syncRefDiffHyst may be preconfigured by implementation.
ETSI
15 Draft ETSI EN 303 798 V2.0.1 (2023-10)
5.7.5 Compatibility with ETSI EN 303 613
For the PHY and MAC layers, an ITS station using LTE-V2X Release-16 shall be backwards compatible with an ITS
station which complies with ETSI EN 303 613 [i.1] as specified in Table A.1.6.
NOTE: ETSI EN 303 613 [i.1] defines an ITS station based on LTE-V2X in 3GPP Release-14.
6 NR-V2X access layers
6.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 138 211 [25], ETSI TS 138 212 [26], ETSI TS 138 213 [27], ETSI TS 138 214 [28] and ETSI
TS 138 215 [29].
The minimum set of the essential NR-V2X information elements defined in ETSI TS 138 331 [20] and their
default/initial values shall be as in clause A.2, Table A.2.1.
NOTE: Regional regulations may apply to default/initial values.
6.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for NR-V2X sidelink
communications, and shall be as defined in ETSI TS 138 321 [22].
6.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 138 322 [23].
6.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP) and shall be as defined in ETSI TS 138 323 [24].
6.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 138 331 [20].
6.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 501 [32].
ETSI
16 Draft ETSI EN 303 798 V2.0.1 (2023-10)
6.7 Additional NR-V2X access layer functionality for PC5
interface
6.7.1 Transmission/reception of NR-V2X communication over PC5
Additional NR-V2X access layer functionality for transmission/reception of NR-V2X communication over PC5 shall be
compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
6.7.2 QoS management
An ITS station using NR-V2X shall (de)prioritize a data packet according to its Priority value in access layer as defined
in ETSI TS 138 331 [20] and ETSI TS 138 213 [27].
6.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform NR-V2X Communication shall be as defined in ETSI
TS 138 413 [33], ETSI TS 138 414 [34] and ETSI TS 103 574 [19].
6.7.4 Synchronization
An ITS station using NR-V2X shall synchronize with a synchronization reference in both time and frequency before
communicating with other ITS stations using NR-V2X. The Synchronization related functionality of an ITS station
using NR-V2X shall be compliant with ETSI TS 138 331 [20].
An ITS Station may be synchronized to a Cell (gNB/eNB), a GNSS, a SyncRef UE or its own internal clock.
A SyncRef UE transmits a combination of sidelink synchronization signals (S-PSS and S-SSS) called SLSS. There are
672 combinations of these signals, each combination represents a SLSS ID.
A SyncRef UE will indicate in the MIB-SL if it is in coverage of cell/GNSS or not.
An ITS Station may have (pre)configured the synchronization priority for an NR-V2X frequency: sl-SyncPriority (cell
or GNSS).
Five groups of SyncRef UEs:
1) MIB-SL.inCoverage=true and SLSS ID=0: SyncRef UE is in coverage of GNSS.
2) MIB-SL.inCoverage=false and SLSS ID=0: SyncRef UE is out of coverage and sync. to SyncRef UE in [20]
coverage of GNSS.
3) MIB-SL.inCoverage=true and SLSS ID={1.335}: SyncRef UE is in coverage of a cell.
4) MIB-SL.inCoverage=false and SLSS ID={1.335}: SyncRef UE is out of coverage and sync. to SyncRef UE
in coverage of a cell.
5) MIB-SL.inCoverage=false and SLSS ID={336.671}: SyncRef UE is out of coverage and sync. to its internal
clock or to a SyncRef UE which is out of coverage.
6.8 Cast Management
For NR-V2X, the cast type, i.e. broadcast, groupcast or unicast, shall be passed to the access layer as described in ETSI
TS 103 836-4-3 [37]. For the unicast and groupcast, the destination ID and the destination group ID may be passed to
the access layer respectively.
For the groupcast for an application layer connection-less group (i.e. connection-less groupcast), QoS range shall be
also passed to the access layer as described in ETSI TS 103 836-4-3 [37]. For the groupcast for an application layer
managed group (i.e. connection-oriented groupcast), the member ID and group size shall be also passed to the access
layer as described in ETSI TS 103 836-4-3 [37].
ETSI
17 Draft ETSI EN 303 798 V2.0.1 (2023-10)
Annex A (normative):
Information Elements
A.1 LTE-V2X information elements
The minimum set of the LTE-V2X information elements is defined in ETSI TS 136 331 [1]. Their default/initial values
shall be as specified in Tables A.1.1 to A.1.6. Mandatory values shall be static. Recommended values may be deviated
from, for example by negotiation between devices to improve system performance, or in an ETSI profile, unless
specified otherwise in a deployment profile.
NOTE 1: Any specific deployment can deviate from the default values below under the conditions specified in
ETSI TS 136 331 [1].
Any deviation from default/initial values are documented in the LTE-V2X profile, ETSI TS 103 723 [35].
For the ASN.1 representation of the below described information elements, see clause 6 in ETSI TS 136 331 [1].
NOTE 2: A value can be mandatory (M) or recommended (R).
NOTE 3: Interoperability of implementations of LTE-V2X specified in the present document, with
implementations of ETSI EN 303 613 [i.1], may be achieved by using the default values given in
Annex B of ETSI EN 303 613 [i.1].
ETSI
18 Draft ETSI EN 303 798 V2.0.1 (2023-10)
Table A.1.1: General LTE-V2X information elements
Item LTE-V2X information Value (Note 1) Comment Mandatory/
element Recommended
Value
1 rohc-Profiles All "False" Indicates robust header compression profiles can be supported in M
SL-V2X-Preconfiguration.
2 carrierFreq The carrier frequency of Indicates one E-UTRAN frequency. M
one of the channels See (EU) 2020/1426 [i.4].
regulated in Europe for ITS
communication.
3 maxTxPower 23 Indicates maximal transmit power in dBm per ITS station in the frequency identified in R
item 2.
4 additionalSpectrumEmission NS 33 Indicates the additional spectrum emission requirements and power reduction for protected M
zone. See ETSI TS 136 101 [13].
5 sl-bandwidth n50 for 10 MHz channel. Indicates the carrier bandwidth. See ETSI TS 136 331 [1]. M
n100 for 20 MHz channel.
6 tdd-ConfigSL None TDD configuration. The value none means that Frame Structure Type 1 specified in ETSI M
TS 1
...
Final draft ETSI EN 303 798 V2.1.0 (2024-06)
EUROPEAN STANDARD
Intelligent Transport Systems (ITS);
LTE-V2X and NR-V2X Access layer specification
for Intelligent Transport Systems operating
in the 5 GHz frequency band;
Release 2
2 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Reference
REN/ITS-00446
Keywords
5G, ITS, layer 1, layer 2, LTE, MAC, radio
ETSI
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ETSI
3 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 9
4 General requirements . 11
4.1 Architecture . 11
4.2 Operating Frequencies . 12
4.3 Transmit and receive requirement . 12
4.4 Congestion control . 12
4.5 CEN DSRC protection . 12
5 LTE-V2X access layers . 12
5.1 Physical layer . 12
5.2 MAC layer . 13
5.3 RLC layer . 13
5.4 PDCP layer . 13
5.5 RRC layer . 13
5.6 NAS layer . 13
5.7 Additional LTE-V2X access layer functionality for PC5 interface . 13
5.7.1 Transmission/reception of LTE-V2X communication over PC5 . 13
5.7.2 QoS management . 13
5.7.3 PC5 parameter provisioning . 13
5.7.4 Synchronization . 14
5.7.5 Compatibility with ETSI EN 303 613. 14
6 NR-V2X access layers. 14
6.1 Physical layer . 14
6.2 MAC layer . 14
6.3 RLC layer . 14
6.4 PDCP layer . 14
6.5 RRC layer . 15
6.6 NAS layer . 15
6.7 Additional NR-V2X access layer functionality for PC5 interface. 15
6.7.1 Transmission/reception of NR-V2X communication over PC5 . 15
6.7.2 QoS management . 15
6.7.3 PC5 parameter provisioning . 15
6.7.4 Synchronization . 15
6.8 Cast Management . 16
Annex A (normative): Information Elements . 17
A.1 LTE-V2X information elements . 17
A.2 NR-V2X information elements . 20
Annex B (normative): List of MCS-RB prohibited cases (LTE-V2X) . 42
History . 44
ETSI
4 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
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DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its
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Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the ®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This final draft European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport
Systems (ITS), and is now submitted for the Vote phase of the ETSI EN Approval Procedure.
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
5 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Introduction
The present document outlines the access layer of the Sidelink (PC5 interface) of cellular based Vehicle to Everything
communication technology specified in ETSI TS 138 300 [21], which can be operated in the 5,9 GHz frequency band
allocated in Europe. NR-V2X and LTE-V2X access layers consist of RRC layer, PDCP layer, RLC layer, MAC layer
and Physical layer. A NAS layer is also introduced as part of the access layer in the present document for the provision
of control. The present document includes requirements for congestion control and for CEN DSRC protection.
The present document does not override regional regulations. The regional regulations apply.
ETSI
6 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
1 Scope
The present document defines the physical layer, the data link layer and radio resource configuration, grouped into the
access layer of the ITS station reference architecture ETSI TS 103 898 [i.2]. The access layer technology that is
specified in the present document refers to what is known as the sidelink or PC5 interface of cellular V2X for the
following frequency bands:
• Operation in frequency band dedicated to ITS for safety related applications in the frequency range 5,875 GHz
to 5,925 GHz.
• Operation in frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to
5,875 GHz.
The present document is a revision of ETSI EN 303 613 [i.1], and extends the LTE-V2X access layer specification to
include NR-V2X.
Whether LTE-V2X or NR-V2X is used for message transmission in an ITS channel is determined by a system level
configuration and outside the scope of the present document.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 136 331: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification (3GPP TS 36.331 Release 16)".
[2] ETSI TS 136 300: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved
Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (3GPP
TS 36.300 Release 16)".
[3] ETSI TS 136 321: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access
Control (MAC) protocol specification (3GPP TS 36.321 Release 16)".
[4] ETSI TS 136 322: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link
Control (RLC) protocol specification (3GPP TS 36.322 Release 16)".
[5] ETSI TS 136 323: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data
Convergence Protocol (PDCP) specification (3GPP TS 36.323 Release 16)".
[6] ETSI TS 136 211: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
channels and modulation (3GPP TS 36.211 Release 16)".
[7] ETSI TS 136 212: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing
and channel coding (3GPP TS 36.212 Release 16)".
[8] ETSI TS 136 213: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures (3GPP TS 36.213 Release 16)".
ETSI
7 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
[9] ETSI TS 136 214: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer;
Measurements (3GPP TS 36.214 Release 16)".
[10] ETSI TS 123 285: "Universal Mobile Telecommunications System (UMTS); LTE; Architecture
enhancements for V2X services (3GPP TS 23.285 Release 16)".
[11] ETSI TS 124 385: "LTE; V2X services Management Object (MO) (3GPP TS 24.385 Release 16)".
[12] ETSI TS 124 386: "LTE; User Equipment (UE) to V2X control function; protocol aspects; Stage 3
(3GPP TS 24.386 Release 16)".
[13] ETSI TS 136 101: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment
(UE) radio transmission and reception (3GPP TS 36.101 Release 16)".
[14] ETSI TS 136 133: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements
for support of radio resource management (3GPP TS 36.133 Release 16)".
[15] ETSI TS 124 301: "Universal Mobile Telecommunications System (UMTS); LTE; 5G;
Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 (3GPP
TS 24.301 Release 16)".
[16] ETSI TS 136 413: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
Application Protocol (S1AP) (3GPP TS 36.413 Release 16)".
[17] ETSI TS 136 414: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
data transport (3GPP TS 36.414 Release 16)".
[18] ETSI TS 102 792: "Intelligent Transport Systems (ITS); Mitigation techniques to avoid
interference between European CEN Dedicated Short Range Communication (CEN DSRC)
equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".
[19] ETSI TS 103 574: "Intelligent Transport Systems (ITS); Congestion Control Mechanisms for
C-V2X PC5 interface; Access layer part; Release 2".
[20] ETSI TS 138 331: "5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP
TS 38.331 Release 16)".
[21] ETSI TS 138 300: "5G; NR; NR and NG-RAN Overall description; Stage-2 (3GPP
TS 38.300 Release 16)".
[22] ETSI TS 138 321: "5G; NR; Medium Access Control (MAC) protocol specification (3GPP
TS 38.321 Release 16)".
[23] ETSI TS 138 322: "5G ; NR; Radio Link Control (RLC) protocol specification (3GPP
TS 38.322 Release 16)".
[24] ETSI TS 138 323: "5G; NR; Packet Data Convergence Protocol (PDCP) specification (3GPP
TS 38.323 Release 16)".
[25] ETSI TS 138 211: "5G ; NR; Physical channels and modulation (3GPP TS 38.211 Release 16)".
[26] ETSI TS 138 212: "5G; NR; Multiplexing and channel coding (3GPP TS 38.212 Release 16)".
[27] ETSI TS 138 213: "5G; NR; Physical layer procedures for control (3GPP TS 38.213 Release 16)".
[28] ETSI TS 138 214: "5G; NR; Physical layer procedures for data (3GPP TS 38.214 Release 16)".
[29] ETSI TS 138 215: "5G; NR; Physical layer measurements (3GPP TS 38.215 Release 16)".
[30] ETSI TS 138 101-1: "5G; NR; User Equipment (UE) radio transmission and reception;
Part 1: Range 1 Standalone (3GPP TS 38.101-1 Release 16)".
[31] ETSI TS 138 133: "5G; NR; Requirements for support of radio resource management (3GPP
TS 38.133 Release 16)".
[32] ETSI TS 124 501: "5G; Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3
(3GPP TS 24.501 Release 16)".
ETSI
8 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
[33] ETSI TS 138 413: "5G; NG-RAN; NG Application Protocol (NGAP) (3GPP TS 38.413
Release 16)".
[34] ETSI TS 138 414: "5G; NG-RAN; NG data transport (3GPP TS 38.414 Release 16)".
[35] ETSI TS 103 723: "Intelligent Transport Systems (ITS); Profile for LTE-V2X Direct
Communication".
[36] ETSI TS 123 287: "5G; Architecture enhancements for 5G System (5GS) to support
Vehicle-to-Everything (V2X) services (3GPP TS 23.287 Release 16)".
[37] ETSI TS 103 836-4-3: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 3: Media-dependent functionalities for NR-V2X
PC5 and LTE-V2X PC5; Release 2".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 303 613: "Intelligent Transport Systems (ITS); LTE-V2X Access layer specification for
Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI TS 103 898: "Intelligent Transport Systems (ITS); Communications Architecture;
Release 2".
[i.3] ETSI EN 302 571: "Intelligent Transport Systems (ITS); Radiocommunications equipment
operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonised Standard covering the
essential requirements of article 3.2 of Directive 2014/53/EU".
[i.4] Commission Implementing Decision (EU) 2020/1426 of 7 October 2020 on the harmonised use of
radio spectrum in the 5 875-5 935 MHz frequency band for safety-related applications of
intelligent transport systems (ITS) and repealing Decision 2008/671/EC.
[i.5] ECC/DEC/(08)01: "The harmonised use of Safety-Related Intelligent Transport Systems (ITS) in
the 5875-5935 MHz frequency band". Approved 14 March 2008. Latest updated 18 November
2022.
[i.6] ECC Recommendation (08)01: "Use of the band 5855-5875 MHz for Intelligent Transport
Systems (ITS)". Approved 21 February 2008. Amended 3 July 2015.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI TS 103 898 [i.2] and the following apply:
channel busy ratio: portion of sub-channels in the resource pool whose S-RSSI measured by the ITS station exceed a
(pre-)configured threshold sensed over last 100 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9] and is different to the
definition in ETSI EN 302 571 [i.3].
ETSI
9 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
channel occupancy ratio: fraction of the total number of sub-channels used by the ITS station for its transmissions out
of the total number of configured (granted) sub-channels over a measurement period of 1 000 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9].
PC5: interface between the ITS stations used for C-V2X sidelink communication
Resource Block (RB): 7 consecutive symbols in the time domain and 12 consecutive subcarriers in the frequency
domain
resource pool: set of resources that can be used for PSCCH and PSSCH
NOTE: Resource pool is defined with the help of start RB, number of sub-channels, size of sub-channel and
available subframes.
sidelink: radio link between the ITS stations for C-V2X direct communication
sub-channel: set of contiguous physical resource blocks
3.2 Symbols
For the purposes of the present document, the following symbols apply:
IN Interface between access layer and networking & transport layer
IN-SAP Interface between access layer and network & transport layer
MF Interface between management entity and facilities layer
MI Interface between management entity and access layer
MN Interface between management entity and networking & transport layer
MS Interface between management entity and security entity
NF Interface between networking & transport layer and facilities layer
SF Interface between security entity and facilities layer
SI Interface between security entity and access layer
SN Interface between security entity and networking & transport layer
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
rd
3GPP 3 Generation Partnership Project
ACK ACKnowledgement
AM Acknowledged Mode
ARFCN Absolute Radio-Frequency Channel Number
ASN.1 Abstract Syntax Notation One
BSR Buffer Status Report
BW BandWidth
BWP BandWidth Part
CBR Channel Busy Ratio
CEN Comité Européen de Normalisation
CID Context IDentifier
CN Core Network
CR Channel occupancy Ratio
CSI Channel State Information
C-V2X Cellular Vehicle to Everything
DFN Direct Frame Number
DL DownLink
DMRS DeModulation Reference Signal
DRB Data Radio Bearer
DSRC Dedicated Short Range Communications
DTX Discontinuous Transmission
eNB enhance Node B
E-UTRA Evolved Universal Terrestrial Radio Access
E-UTRAN Evolved Universal Terrestrial Radio Access Network
ETSI
10 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
FR1 FRequency 1
FR2 FRequency 2
GBR Guaranteed Bit Rate
GFBR Guaranteed Flow Bit Rate
gNB 5G Node B
GNSS Global Navigation Satellite System
HARQ Hybrid Automatic Repeat ReQuest
ID IDentity
IE Information Element
IP Internet Protocol
ITS Intelligent Transport Systems
LCP Link Control Protocol
LTE-V2X Long Term Evolution based Vehicle-to-Everything
M/R Mandatory/Recommended
MAC Medium Access Control
MCS Modulation and Coding Scheme
MCS-RB Modulation and Coding Scheme - Resource Blocks
MFBR Maximum Flow Bit Rate
MIB-SL Master Information Block - SideLink
N/A Not Applicable
NAS Non-Access Stratum
NR New Radio
th
generation) Vehicle to Everything
NR-V2X New Radio (5
NS Network Signalling value
PC5 Proximity-based Communication (Interface) 5
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
PHY PHYsical layer
PPPP ProSe Per-Packet Priority
PQI PC5 QoS Identifier
PRB Physical Resource Block
ProSe Proximity-based Service
PSBCH Physical Sidelink Broadcast CHannel
PSCCH Physical Sidelink Control CHannel
PSFCH Physical Sidelink Feedback CHannel
PSSCH Physical Sidelink Shared CHannel
PTRS Phase Tracking Reference Signal
PUCCH Physical Uplink Control CHannel
PUSCH Physical Uplink Shared CHannel
QAM Quadrature Amplitude Modulation
QoS Quality of Service
RAN Radio Access Network
RB Resource Block
RLC Radio Link Control
RLF Radio Link Failure
RoHC Robust Header Compression
RRC Radio Resource Control
RS Reference Signal
RSRP Reference Signal Received Power
RSSI Received Signal Strength Indication
RSU Road Side Unit
RX Receive
SCI Sidelink Control Information
SCS Sub Carrier Spacing
SDAP Service Data Adaptation Protocol
SDU Service Data Unit
SFN Sub Frame Number
SLSS SideLink Synchronization Signal
SL-SSB SideLink Synchronization Signal Block
SN Sequence Number
SPS Semi Persistent Scheduling
S-PSS (Sidelink) Primary Synchronization Signal
ETSI
11 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
SSID Service Set ID
S-SSS (Sidelink) Secondary Synchronization Signal
SyncRef UE Synchronization Reference User Equipment
TB Transport Block
TDD Time Division Duplex
TX Transmit
UCI Uplink Control Information
UE User Equipment
UL UpLink
UM Unacknowledged Mode
V2X Vehicle-to-Everything
4 General requirements
4.1 Architecture
The ITS station architecture specified in ETSI TS 103 898 [i.2] is in Figure 4.1.1. LTE-V2X as defined in ETSI
TS 136 300 [2] and NR-V2X as defined in ETSI TS 138 300 [21] are two of the access layer technologies of the ITS
station architecture.
Applications
ITS applications
Facilities
Logical Link Control (LLC)
Medium Access Control
Protocols
Networking & Transport
Data link
Physical
Access
Figure 4.1.1: Access Layer in the ITS station architecture
A C-V2X access layer is shown in Figure 4.1.2.
IN-SAP
PDCP
RLC
MAC
PHY
C-V2X Access Layer in ITS Station
Figure 4.1.2: C-V2X Access Layer protocol stack
An ITS station that includes a cellular V2X sidelink technology as the access layer shall support LTE-V2X sidelink
communication as defined in ETSI TS 136 300 [2], or NR-V2X sidelink communication as defined in ETSI
TS 138 300 [21], or both. LTE-V2X and NR-V2X are different access layers.
ETSI
MI-SAP
Management
NAS
RRC
12 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
NOTE: The present document specifies LTE-V2X and NR-V2X based on 3GPP Release-16 and contains no
backwards compatibility requirements other than those explicitly stated in clause 5.7.5.
4.2 Operating Frequencies
ETSI TS 136 101 [13], clause 5.5G defines the operating band of LTE-V2X.
ETSI TS 138 101-1 [30], clause 5.2E defines the operating bands of NR-V2X.
In Europe, ITS frequency band designation for 5 855 MHz to 5 925 MHz is defined by Commission Implementing
Decision (EU) 2020/1426 [i.4], ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
Band 47 in ETSI TS 136 101 [13] and band n47 in ETSI TS 138 101-1 [30] correspond to the European ITS spectrum
in 5 855 MHz to 5 925 MHz as defined by Commission Implementing Decision (EU) 2020/1426 [i.4],
ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
NOTE: While deployment of LTE-V2X and NR-V2X in the same channel could be possible, it is not intended
and is outside the scope of the present document.
4.3 Transmit and receive requirement
An ITS station using LTE-V2X shall fulfil the transmit and receive requirement defined for Band 47 in ETSI
TS 136 101 [13] and ETSI TS 136 133 [14].
An ITS station using NR-V2X shall fulfil the transmit and receive requirement defined for Band n47 in ETSI
TS 138 101-1 [30] and ETSI TS 138 133 [31].
4.4 Congestion control
A C-V2X ITS station shall adapt its CR according to the measured Channel Busy Ratio (CBR) in order to comply with
the required CR limit, as defined in ETSI TS 103 574 [19]. The CBR measurement window shall be as specified in
ETSI TS 103 574 [19] for LTE-V2X and Table A.2.1 row 36 for NR-V2X.
4.5 CEN DSRC protection
An ITS station using LTE-V2X in Band 47 or NR-V2X in Band n47 shall avoid harmful interference to CEN DSRC:
• The ITS station shall be conformant to ETSI TS 102 792 [18].
• If the ITS station is inside the protected zone, it shall adjust its output power level to maximum 10 dBm e.i.r.p.
If the ITS station is inside the protected zone, it shall fulfil the spurious emissions limit of maximum
-65 dBm/MHz within 5 795 MHz to 5 815 MHz.
The upper layers of the ITS station are responsible for detecting that the ITS station is within proximity of CEN DSRC
protection zone according to ETSI TS 102 792 [18] and then sending an indication to access layers to trigger power
level adjustment.
5 LTE-V2X access layers
5.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 136 211 [6], ETSI TS 136 212 [7], ETSI TS 136 213 [8] and ETSI TS 136 214 [9].
The minimum set of the essential LTE-V2X information elements defined in ETSI TS 136 331 [1] and their
default/initial values shall be as in clause A.1, Tables A.1.1 to A.1.6.
ETSI
13 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Additionally, for Rel-16 PSSCH transmission, MCS-RB problematic configurations listed in Annex B shall be
excluded.
5.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for LTE-V2X sidelink
communications, and shall be as defined in ETSI TS 136 321 [3].
NOTE: There are two normal modes of channel access in LTE-V2X:
Semi-Persistent Scheduling (SPS).
Event-Based (known as One-Shot).
5.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 136 322 [4].
5.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP), and shall be as defined in ETSI TS 136 323 [5].
5.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 136 331 [1].
5.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 301 [15].
5.7 Additional LTE-V2X access layer functionality for PC5
interface
5.7.1 Transmission/reception of LTE-V2X communication over PC5
Additional LTE-V2X access layer functionality for transmission/reception of LTE-V2X communication over PC5 shall
be compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
5.7.2 QoS management
An ITS station using LTE-V2X shall (de)prioritize a data packet according to its PPPP value in access layer as defined
in ETSI TS 136 331 [1] and ETSI TS 136 213 [8].
5.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform LTE-V2X Communication shall be as defined in ETSI
TS 123 285 [10], ETSI TS 123 287 [36], ETSI TS 136 413 [16], ETSI TS 136 414 [17] and ETSI TS 103 574 [19].
ETSI
14 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
5.7.4 Synchronization
An ITS station using LTE-V2X shall synchronize with a synchronization reference (e.g. GNSS) in both time and
frequency before communicating with other ITS stations using LTE-V2X. The Synchronization related functionality of
an ITS station using LTE-V2X shall be compliant with ETSI TS 136 331 [1].
For the scenario where ITS station selects synchronization reference on the sidelink (PC5 interface), whether to
(pre-)configure syncOffsetIndicators as defined in ETSI TS 136 331 [1] shall be according to different regions/nations'
implementation. For the case where syncOffsetIndicators is not (pre-)configured, at least RSU ITS station shall be
allowed to transmit sidelink synchronization signalling on the subframes that are not configured to transmit LTE-V2X
messages, e.g. including the reserved subframes calculated according to ETSI TS 136 213 [8] and the subframes
indicated as "0" in sl-Subframe of the transmission pool as per ETSI TS 136 331 [1].
NOTE 1: From transmission-side perspective, whether or not to transmit sidelink synchronization signalling is
based on the ITS station's capability.
NOTE 2: From reception-side perspective, for the case where syncOffsetIndicators is not provided, the parameters
used for sidelink synchronization signalling measurement such as filterCoefficient, syncRefMinHyst and
syncRefDiffHyst may be preconfigured by implementation.
5.7.5 Compatibility with ETSI EN 303 613
For the PHY and MAC layers, an ITS station using LTE-V2X Release-16 shall be backwards compatible with an ITS
station which complies with ETSI EN 303 613 [i.1] as specified in Table A.1.6.
NOTE: ETSI EN 303 613 [i.1] defines an ITS station based on LTE-V2X in 3GPP Release-14.
6 NR-V2X access layers
6.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 138 211 [25], ETSI TS 138 212 [26], ETSI TS 138 213 [27], ETSI TS 138 214 [28] and ETSI
TS 138 215 [29].
The minimum set of the essential NR-V2X information elements defined in ETSI TS 138 331 [20] and their
default/initial values shall be as in clause A.2, Table A.2.1.
NOTE: Regional regulations may apply to default/initial values.
6.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for NR-V2X sidelink
communications, and shall be as defined in ETSI TS 138 321 [22].
6.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 138 322 [23].
6.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP) and shall be as defined in ETSI TS 138 323 [24].
ETSI
15 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
6.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 138 331 [20].
6.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 501 [32].
6.7 Additional NR-V2X access layer functionality for
PC5 interface
6.7.1 Transmission/reception of NR-V2X communication over PC5
Additional NR-V2X access layer functionality for transmission/reception of NR-V2X communication over PC5 shall be
compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
6.7.2 QoS management
An ITS station using NR-V2X shall (de)prioritize a data packet according to its Priority value in access layer as defined
in ETSI TS 138 331 [20] and ETSI TS 138 213 [27].
6.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform NR-V2X Communication shall be as defined in ETSI
TS 138 413 [33], ETSI TS 138 414 [34] and ETSI TS 103 574 [19].
6.7.4 Synchronization
An ITS station using NR-V2X shall synchronize with a synchronization reference in both time and frequency before
communicating with other ITS stations using NR-V2X. The Synchronization related functionality of an ITS station
using NR-V2X shall be compliant with ETSI TS 138 331 [20].
An ITS Station may be synchronized to a Cell (gNB/eNB), a GNSS, a SyncRef UE or its own internal clock.
A SyncRef UE transmits a combination of sidelink synchronization signals (S-PSS and S-SSS) called SLSS. There are
672 combinations of these signals, each combination represents a SLSS ID.
A SyncRef UE will indicate in the MIB-SL if it is in coverage of cell/GNSS or not.
An ITS Station may have (pre)configured the synchronization priority for an NR-V2X frequency: sl-SyncPriority (cell
or GNSS).
Five groups of SyncRef UEs:
1) MIB-SL.inCoverage=true and SLSS ID=0: SyncRef UE is in coverage of GNSS.
2) MIB-SL.inCoverage=false and SLSS ID=0: SyncRef UE is out of coverage and sync. to SyncRef UE in ETSI
TS 138 331 [20] coverage of GNSS.
3) MIB-SL.inCoverage=true and SLSS ID={1.335}: SyncRef UE is in coverage of a cell.
4) MIB-SL.inCoverage=false and SLSS ID={1.335}: SyncRef UE is out of coverage and sync. to SyncRef UE
in coverage of a cell.
5) MIB-SL.inCoverage=false and SLSS ID={336.671}: SyncRef UE is out of coverage and sync. to its internal
clock or to a SyncRef UE which is out of coverage.
ETSI
16 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
6.8 Cast Management
For NR-V2X, the cast type, i.e. broadcast, groupcast or unicast, shall be passed to the access layer as described in ETSI
TS 103 836-4-3 [37]. For the unicast and groupcast, the destination ID and the destination group ID may be passed to
the access layer respectively.
For the groupcast for an application layer connection-less group (i.e. connection-less groupcast), QoS range shall be
also passed to the access layer as described in ETSI TS 103 836-4-3 [37]. For the groupcast for an application layer
managed group (i.e. connection-oriented groupcast), the member ID and group size shall be also passed to the access
layer as described in ETSI TS 103 836-4-3 [37].
ETSI
17 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Annex A (normative):
Information Elements
A.1 LTE-V2X information elements
The minimum set of the LTE-V2X information elements is defined in ETSI TS 136 331 [1]. Their default/initial values
shall be as specified in Tables A.1.1 to A.1.6. Mandatory values shall be static. Recommended values may be deviated
from, for example by negotiation between devices to improve system performance, or in an ETSI profile, unless
specified otherwise in a deployment profile.
NOTE 1: Any specific deployment can deviate from the default values below under the conditions specified in
ETSI TS 136 331 [1].
Any deviation from default/initial values are documented in the LTE-V2X profile, ETSI TS 103 723 [35].
For the ASN.1 representation of the below described information elements, see clause 6 in ETSI TS 136 331 [1].
NOTE 2: A value can be mandatory (M) or recommended (R).
NOTE 3: Interoperability of implementations of LTE-V2X specified in the present document, with
implementations of ETSI EN 303 613 [i.1], may be achieved by using the default values given in
Annex B of ETSI EN 303 613 [i.1].
ETSI
18 Final draft ETSI EN 303 798 V2.1.0 (2024-06)
Table A.1.1: General LTE-V2X information elements
Item LTE-V2X information Value Comment Mandatory/
element (note 1 in clause A.1) Recommended
Value
1 rohc-Profiles All "False" Indicates robust header compression profiles can be supported in M
SL-V2X-Preconfiguration.
2 carrierFreq The carrier frequency of Indicates one E-UTRAN frequency. M
one of the channels See (EU) 2020/1426 [i.4].
regulated in Europe for ITS
communication.
3 maxTxPower 23 Indicates maximal transmit power in dBm per ITS station in the frequency identified in R
item 2.
4 additionalSpectrumEmission NS 33 Indicates the additional spectrum emission requirements and power reduction for protected M
zone. See ETSI TS 136 101 [13].
5 sl-bandwidth n50 for 10 MHz channel. Indicates the carrier bandwidth. See ETSI TS 136 331 [1]. M
n100 for 20 MHz channel.
TDD configuration. The value none means that Frame Structure Type 1 specified in ETSI
6 tdd-ConfigSL None M
TS 136 211 [6] is used.
7 syncAllowed Gnss Indicates the allowed synchronization reference(s) which is (are) allowed to use the M
configured resource pool. In this case, it is a GNSS sync source.
8 syncOffsetIndicators empty Indicates the transmission windows of the sidelink synchronization signalling. By default, M
no syncOffsetIndicators shall be configured. If indicated otherwise or required by regional
regulations, the syncOffsetIndicator1 = 0 and syncOffsetIndicator2 = 80, see clause 5.7.4.
9 threshS-RSSI-CBR 9 Indicates the S-RSSI threshold for determining the contribution of a sub-channel to the M
CBR measurement.
Table A.1.2: LTE-V2X information elements for transmission pools
Item LTE-V2X Value Comment Mandatory/
information element (not
...
EUROPEAN STANDARD
Intelligent Transport Systems (ITS);
LTE-V2X and NR-V2X Access layer specification
for Intelligent Transport Systems operating
in the 5 GHz frequency band;
Release 2
2 ETSI EN 303 798 V2.1.1 (2024-08)
Reference
REN/ITS-00446
Keywords
5G, ITS, layer 1, layer 2, LTE, MAC, radio
ETSI
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ETSI
3 ETSI EN 303 798 V2.1.1 (2024-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 9
4 General requirements . 11
4.1 Architecture . 11
4.2 Operating Frequencies . 12
4.3 Transmit and receive requirement . 12
4.4 Congestion control . 12
4.5 CEN DSRC protection . 12
5 LTE-V2X access layers . 12
5.1 Physical layer . 12
5.2 MAC layer . 13
5.3 RLC layer . 13
5.4 PDCP layer . 13
5.5 RRC layer . 13
5.6 NAS layer . 13
5.7 Additional LTE-V2X access layer functionality for PC5 interface . 13
5.7.1 Transmission/reception of LTE-V2X communication over PC5 . 13
5.7.2 QoS management . 13
5.7.3 PC5 parameter provisioning . 13
5.7.4 Synchronization . 14
5.7.5 Compatibility with ETSI EN 303 613. 14
6 NR-V2X access layers. 14
6.1 Physical layer . 14
6.2 MAC layer . 14
6.3 RLC layer . 14
6.4 PDCP layer . 14
6.5 RRC layer . 15
6.6 NAS layer . 15
6.7 Additional NR-V2X access layer functionality for PC5 interface. 15
6.7.1 Transmission/reception of NR-V2X communication over PC5 . 15
6.7.2 QoS management . 15
6.7.3 PC5 parameter provisioning . 15
6.7.4 Synchronization . 15
6.8 Cast Management . 16
Annex A (normative): Information Elements . 17
A.1 LTE-V2X information elements . 17
A.2 NR-V2X information elements . 20
Annex B (normative): List of MCS-RB prohibited cases (LTE-V2X) . 42
History . 44
ETSI
4 ETSI EN 303 798 V2.1.1 (2024-08)
Intellectual Property Rights
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Foreword
This European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS).
National transposition dates
Date of adoption of this EN: 12 August 2024
Date of latest announcement of this EN (doa): 30 November 2024
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 May 2025
Date of withdrawal of any conflicting National Standard (dow): 31 May 2025
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
5 ETSI EN 303 798 V2.1.1 (2024-08)
Introduction
The present document outlines the access layer of the Sidelink (PC5 interface) of cellular based Vehicle to Everything
communication technology specified in ETSI TS 138 300 [21], which can be operated in the 5,9 GHz frequency band
allocated in Europe. NR-V2X and LTE-V2X access layers consist of RRC layer, PDCP layer, RLC layer, MAC layer
and Physical layer. A NAS layer is also introduced as part of the access layer in the present document for the provision
of control. The present document includes requirements for congestion control and for CEN DSRC protection.
The present document does not override regional regulations. The regional regulations apply.
ETSI
6 ETSI EN 303 798 V2.1.1 (2024-08)
1 Scope
The present document defines the physical layer, the data link layer and radio resource configuration, grouped into the
access layer of the ITS station reference architecture ETSI TS 103 898 [i.2]. The access layer technology that is
specified in the present document refers to what is known as the sidelink or PC5 interface of cellular V2X for the
following frequency bands:
• Operation in frequency band dedicated to ITS for safety related applications in the frequency range 5,875 GHz
to 5,925 GHz.
• Operation in frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to
5,875 GHz.
The present document is a revision of ETSI EN 303 613 [i.1], and extends the LTE-V2X access layer specification to
include NR-V2X.
Whether LTE-V2X or NR-V2X is used for message transmission in an ITS channel is determined by a system level
configuration and outside the scope of the present document.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 136 331: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification (3GPP TS 36.331 Release 16)".
[2] ETSI TS 136 300: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved
Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (3GPP
TS 36.300 Release 16)".
[3] ETSI TS 136 321: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access
Control (MAC) protocol specification (3GPP TS 36.321 Release 16)".
[4] ETSI TS 136 322: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link
Control (RLC) protocol specification (3GPP TS 36.322 Release 16)".
[5] ETSI TS 136 323: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data
Convergence Protocol (PDCP) specification (3GPP TS 36.323 Release 16)".
[6] ETSI TS 136 211: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
channels and modulation (3GPP TS 36.211 Release 16)".
[7] ETSI TS 136 212: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing
and channel coding (3GPP TS 36.212 Release 16)".
[8] ETSI TS 136 213: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures (3GPP TS 36.213 Release 16)".
ETSI
7 ETSI EN 303 798 V2.1.1 (2024-08)
[9] ETSI TS 136 214: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer;
Measurements (3GPP TS 36.214 Release 16)".
[10] ETSI TS 123 285: "Universal Mobile Telecommunications System (UMTS); LTE; Architecture
enhancements for V2X services (3GPP TS 23.285 Release 16)".
[11] ETSI TS 124 385: "LTE; V2X services Management Object (MO) (3GPP TS 24.385 Release 16)".
[12] ETSI TS 124 386: "LTE; User Equipment (UE) to V2X control function; protocol aspects; Stage 3
(3GPP TS 24.386 Release 16)".
[13] ETSI TS 136 101: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment
(UE) radio transmission and reception (3GPP TS 36.101 Release 16)".
[14] ETSI TS 136 133: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements
for support of radio resource management (3GPP TS 36.133 Release 16)".
[15] ETSI TS 124 301: "Universal Mobile Telecommunications System (UMTS); LTE; 5G;
Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 (3GPP
TS 24.301 Release 16)".
[16] ETSI TS 136 413: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
Application Protocol (S1AP) (3GPP TS 36.413 Release 16)".
[17] ETSI TS 136 414: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
data transport (3GPP TS 36.414 Release 16)".
[18] ETSI TS 102 792: "Intelligent Transport Systems (ITS); Mitigation techniques to avoid
interference between European CEN Dedicated Short Range Communication (CEN DSRC)
equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".
[19] ETSI TS 103 574: "Intelligent Transport Systems (ITS); Congestion Control Mechanisms for
C-V2X PC5 interface; Access layer part; Release 2".
[20] ETSI TS 138 331: "5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP
TS 38.331 Release 16)".
[21] ETSI TS 138 300: "5G; NR; NR and NG-RAN Overall description; Stage-2 (3GPP
TS 38.300 Release 16)".
[22] ETSI TS 138 321: "5G; NR; Medium Access Control (MAC) protocol specification (3GPP
TS 38.321 Release 16)".
[23] ETSI TS 138 322: "5G ; NR; Radio Link Control (RLC) protocol specification (3GPP
TS 38.322 Release 16)".
[24] ETSI TS 138 323: "5G; NR; Packet Data Convergence Protocol (PDCP) specification (3GPP
TS 38.323 Release 16)".
[25] ETSI TS 138 211: "5G ; NR; Physical channels and modulation (3GPP TS 38.211 Release 16)".
[26] ETSI TS 138 212: "5G; NR; Multiplexing and channel coding (3GPP TS 38.212 Release 16)".
[27] ETSI TS 138 213: "5G; NR; Physical layer procedures for control (3GPP TS 38.213 Release 16)".
[28] ETSI TS 138 214: "5G; NR; Physical layer procedures for data (3GPP TS 38.214 Release 16)".
[29] ETSI TS 138 215: "5G; NR; Physical layer measurements (3GPP TS 38.215 Release 16)".
[30] ETSI TS 138 101-1: "5G; NR; User Equipment (UE) radio transmission and reception;
Part 1: Range 1 Standalone (3GPP TS 38.101-1 Release 16)".
[31] ETSI TS 138 133: "5G; NR; Requirements for support of radio resource management (3GPP
TS 38.133 Release 16)".
[32] ETSI TS 124 501: "5G; Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3
(3GPP TS 24.501 Release 16)".
ETSI
8 ETSI EN 303 798 V2.1.1 (2024-08)
[33] ETSI TS 138 413: "5G; NG-RAN; NG Application Protocol (NGAP) (3GPP TS 38.413
Release 16)".
[34] ETSI TS 138 414: "5G; NG-RAN; NG data transport (3GPP TS 38.414 Release 16)".
[35] ETSI TS 103 723: "Intelligent Transport Systems (ITS); Profile for LTE-V2X Direct
Communication".
[36] ETSI TS 123 287: "5G; Architecture enhancements for 5G System (5GS) to support
Vehicle-to-Everything (V2X) services (3GPP TS 23.287 Release 16)".
[37] ETSI TS 103 836-4-3: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 3: Media-dependent functionalities for NR-V2X
PC5 and LTE-V2X PC5; Release 2".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 303 613: "Intelligent Transport Systems (ITS); LTE-V2X Access layer specification for
Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI TS 103 898: "Intelligent Transport Systems (ITS); Communications Architecture;
Release 2".
[i.3] ETSI EN 302 571: "Intelligent Transport Systems (ITS); Radiocommunications equipment
operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonised Standard covering the
essential requirements of article 3.2 of Directive 2014/53/EU".
[i.4] Commission Implementing Decision (EU) 2020/1426 of 7 October 2020 on the harmonised use of
radio spectrum in the 5 875-5 935 MHz frequency band for safety-related applications of
intelligent transport systems (ITS) and repealing Decision 2008/671/EC.
[i.5] ECC/DEC/(08)01: "The harmonised use of Safety-Related Intelligent Transport Systems (ITS) in
the 5875-5935 MHz frequency band". Approved 14 March 2008. Latest updated 18 November
2022.
[i.6] ECC Recommendation (08)01: "Use of the band 5855-5875 MHz for Intelligent Transport
Systems (ITS)". Approved 21 February 2008. Amended 3 July 2015.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI TS 103 898 [i.2] and the following apply:
channel busy ratio: portion of sub-channels in the resource pool whose S-RSSI measured by the ITS station exceed a
(pre-)configured threshold sensed over last 100 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9] and is different to the
definition in ETSI EN 302 571 [i.3].
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9 ETSI EN 303 798 V2.1.1 (2024-08)
channel occupancy ratio: fraction of the total number of sub-channels used by the ITS station for its transmissions out
of the total number of configured (granted) sub-channels over a measurement period of 1 000 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9].
PC5: interface between the ITS stations used for C-V2X sidelink communication
Resource Block (RB): 7 consecutive symbols in the time domain and 12 consecutive subcarriers in the frequency
domain
resource pool: set of resources that can be used for PSCCH and PSSCH
NOTE: Resource pool is defined with the help of start RB, number of sub-channels, size of sub-channel and
available subframes.
sidelink: radio link between the ITS stations for C-V2X direct communication
sub-channel: set of contiguous physical resource blocks
3.2 Symbols
For the purposes of the present document, the following symbols apply:
IN Interface between access layer and networking & transport layer
IN-SAP Interface between access layer and network & transport layer
MF Interface between management entity and facilities layer
MI Interface between management entity and access layer
MN Interface between management entity and networking & transport layer
MS Interface between management entity and security entity
NF Interface between networking & transport layer and facilities layer
SF Interface between security entity and facilities layer
SI Interface between security entity and access layer
SN Interface between security entity and networking & transport layer
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
rd
3GPP 3 Generation Partnership Project
ACK ACKnowledgement
AM Acknowledged Mode
ARFCN Absolute Radio-Frequency Channel Number
ASN.1 Abstract Syntax Notation One
BSR Buffer Status Report
BW BandWidth
BWP BandWidth Part
CBR Channel Busy Ratio
CEN Comité Européen de Normalisation
CID Context IDentifier
CN Core Network
CR Channel occupancy Ratio
CSI Channel State Information
C-V2X Cellular Vehicle to Everything
DFN Direct Frame Number
DL DownLink
DMRS DeModulation Reference Signal
DRB Data Radio Bearer
DSRC Dedicated Short Range Communications
DTX Discontinuous Transmission
eNB enhance Node B
E-UTRA Evolved Universal Terrestrial Radio Access
E-UTRAN Evolved Universal Terrestrial Radio Access Network
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10 ETSI EN 303 798 V2.1.1 (2024-08)
FR1 FRequency 1
FR2 FRequency 2
GBR Guaranteed Bit Rate
GFBR Guaranteed Flow Bit Rate
gNB 5G Node B
GNSS Global Navigation Satellite System
HARQ Hybrid Automatic Repeat ReQuest
ID IDentity
IE Information Element
IP Internet Protocol
ITS Intelligent Transport Systems
LCP Link Control Protocol
LTE-V2X Long Term Evolution based Vehicle-to-Everything
M/R Mandatory/Recommended
MAC Medium Access Control
MCS Modulation and Coding Scheme
MCS-RB Modulation and Coding Scheme - Resource Blocks
MFBR Maximum Flow Bit Rate
MIB-SL Master Information Block - SideLink
N/A Not Applicable
NAS Non-Access Stratum
NR New Radio
th
generation) Vehicle to Everything
NR-V2X New Radio (5
NS Network Signalling value
PC5 Proximity-based Communication (Interface) 5
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
PHY PHYsical layer
PPPP ProSe Per-Packet Priority
PQI PC5 QoS Identifier
PRB Physical Resource Block
ProSe Proximity-based Service
PSBCH Physical Sidelink Broadcast CHannel
PSCCH Physical Sidelink Control CHannel
PSFCH Physical Sidelink Feedback CHannel
PSSCH Physical Sidelink Shared CHannel
PTRS Phase Tracking Reference Signal
PUCCH Physical Uplink Control CHannel
PUSCH Physical Uplink Shared CHannel
QAM Quadrature Amplitude Modulation
QoS Quality of Service
RAN Radio Access Network
RB Resource Block
RLC Radio Link Control
RLF Radio Link Failure
RoHC Robust Header Compression
RRC Radio Resource Control
RS Reference Signal
RSRP Reference Signal Received Power
RSSI Received Signal Strength Indication
RSU Road Side Unit
RX Receive
SCI Sidelink Control Information
SCS Sub Carrier Spacing
SDAP Service Data Adaptation Protocol
SDU Service Data Unit
SFN Sub Frame Number
SLSS SideLink Synchronization Signal
SL-SSB SideLink Synchronization Signal Block
SN Sequence Number
SPS Semi Persistent Scheduling
S-PSS (Sidelink) Primary Synchronization Signal
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11 ETSI EN 303 798 V2.1.1 (2024-08)
SSID Service Set ID
S-SSS (Sidelink) Secondary Synchronization Signal
SyncRef UE Synchronization Reference User Equipment
TB Transport Block
TDD Time Division Duplex
TX Transmit
UCI Uplink Control Information
UE User Equipment
UL UpLink
UM Unacknowledged Mode
V2X Vehicle-to-Everything
4 General requirements
4.1 Architecture
The ITS station architecture specified in ETSI TS 103 898 [i.2] is in Figure 4.1.1. LTE-V2X as defined in ETSI
TS 136 300 [2] and NR-V2X as defined in ETSI TS 138 300 [21] are two of the access layer technologies of the ITS
station architecture.
Applications
ITS applications
Facilities
Logical Link Control (LLC)
Medium Access Control
Protocols
Networking & Transport
Data link
Physical
Access
Figure 4.1.1: Access Layer in the ITS station architecture
A C-V2X access layer is shown in Figure 4.1.2.
IN-SAP
PDCP
RLC
MAC
PHY
C-V2X Access Layer in ITS Station
Figure 4.1.2: C-V2X Access Layer protocol stack
An ITS station that includes a cellular V2X sidelink technology as the access layer shall support LTE-V2X sidelink
communication as defined in ETSI TS 136 300 [2], or NR-V2X sidelink communication as defined in ETSI
TS 138 300 [21], or both. LTE-V2X and NR-V2X are different access layers.
ETSI
MI-SAP
Management
NAS
RRC
12 ETSI EN 303 798 V2.1.1 (2024-08)
NOTE: The present document specifies LTE-V2X and NR-V2X based on 3GPP Release-16 and contains no
backwards compatibility requirements other than those explicitly stated in clause 5.7.5.
4.2 Operating Frequencies
ETSI TS 136 101 [13], clause 5.5G defines the operating band of LTE-V2X.
ETSI TS 138 101-1 [30], clause 5.2E defines the operating bands of NR-V2X.
In Europe, ITS frequency band designation for 5 855 MHz to 5 925 MHz is defined by Commission Implementing
Decision (EU) 2020/1426 [i.4], ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
Band 47 in ETSI TS 136 101 [13] and band n47 in ETSI TS 138 101-1 [30] correspond to the European ITS spectrum
in 5 855 MHz to 5 925 MHz as defined by Commission Implementing Decision (EU) 2020/1426 [i.4],
ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
NOTE: While deployment of LTE-V2X and NR-V2X in the same channel could be possible, it is not intended
and is outside the scope of the present document.
4.3 Transmit and receive requirement
An ITS station using LTE-V2X shall fulfil the transmit and receive requirement defined for Band 47 in ETSI
TS 136 101 [13] and ETSI TS 136 133 [14].
An ITS station using NR-V2X shall fulfil the transmit and receive requirement defined for Band n47 in ETSI
TS 138 101-1 [30] and ETSI TS 138 133 [31].
4.4 Congestion control
A C-V2X ITS station shall adapt its CR according to the measured Channel Busy Ratio (CBR) in order to comply with
the required CR limit, as defined in ETSI TS 103 574 [19]. The CBR measurement window shall be as specified in
ETSI TS 103 574 [19] for LTE-V2X and Table A.2.1 row 36 for NR-V2X.
4.5 CEN DSRC protection
An ITS station using LTE-V2X in Band 47 or NR-V2X in Band n47 shall avoid harmful interference to CEN DSRC:
• The ITS station shall be conformant to ETSI TS 102 792 [18].
• If the ITS station is inside the protected zone, it shall adjust its output power level to maximum 10 dBm e.i.r.p.
If the ITS station is inside the protected zone, it shall fulfil the spurious emissions limit of maximum
-65 dBm/MHz within 5 795 MHz to 5 815 MHz.
The upper layers of the ITS station are responsible for detecting that the ITS station is within proximity of CEN DSRC
protection zone according to ETSI TS 102 792 [18] and then sending an indication to access layers to trigger power
level adjustment.
5 LTE-V2X access layers
5.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 136 211 [6], ETSI TS 136 212 [7], ETSI TS 136 213 [8] and ETSI TS 136 214 [9].
The minimum set of the essential LTE-V2X information elements defined in ETSI TS 136 331 [1] and their
default/initial values shall be as in clause A.1, Tables A.1.1 to A.1.6.
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13 ETSI EN 303 798 V2.1.1 (2024-08)
Additionally, for Rel-16 PSSCH transmission, MCS-RB problematic configurations listed in Annex B shall be
excluded.
5.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for LTE-V2X sidelink
communications, and shall be as defined in ETSI TS 136 321 [3].
NOTE: There are two normal modes of channel access in LTE-V2X:
Semi-Persistent Scheduling (SPS).
Event-Based (known as One-Shot).
5.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 136 322 [4].
5.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP), and shall be as defined in ETSI TS 136 323 [5].
5.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 136 331 [1].
5.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 301 [15].
5.7 Additional LTE-V2X access layer functionality for PC5
interface
5.7.1 Transmission/reception of LTE-V2X communication over PC5
Additional LTE-V2X access layer functionality for transmission/reception of LTE-V2X communication over PC5 shall
be compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
5.7.2 QoS management
An ITS station using LTE-V2X shall (de)prioritize a data packet according to its PPPP value in access layer as defined
in ETSI TS 136 331 [1] and ETSI TS 136 213 [8].
5.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform LTE-V2X Communication shall be as defined in ETSI
TS 123 285 [10], ETSI TS 123 287 [36], ETSI TS 136 413 [16], ETSI TS 136 414 [17] and ETSI TS 103 574 [19].
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14 ETSI EN 303 798 V2.1.1 (2024-08)
5.7.4 Synchronization
An ITS station using LTE-V2X shall synchronize with a synchronization reference (e.g. GNSS) in both time and
frequency before communicating with other ITS stations using LTE-V2X. The Synchronization related functionality of
an ITS station using LTE-V2X shall be compliant with ETSI TS 136 331 [1].
For the scenario where ITS station selects synchronization reference on the sidelink (PC5 interface), whether to
(pre-)configure syncOffsetIndicators as defined in ETSI TS 136 331 [1] shall be according to different regions/nations'
implementation. For the case where syncOffsetIndicators is not (pre-)configured, at least RSU ITS station shall be
allowed to transmit sidelink synchronization signalling on the subframes that are not configured to transmit LTE-V2X
messages, e.g. including the reserved subframes calculated according to ETSI TS 136 213 [8] and the subframes
indicated as "0" in sl-Subframe of the transmission pool as per ETSI TS 136 331 [1].
NOTE 1: From transmission-side perspective, whether or not to transmit sidelink synchronization signalling is
based on the ITS station's capability.
NOTE 2: From reception-side perspective, for the case where syncOffsetIndicators is not provided, the parameters
used for sidelink synchronization signalling measurement such as filterCoefficient, syncRefMinHyst and
syncRefDiffHyst may be preconfigured by implementation.
5.7.5 Compatibility with ETSI EN 303 613
For the PHY and MAC layers, an ITS station using LTE-V2X Release-16 shall be backwards compatible with an ITS
station which complies with ETSI EN 303 613 [i.1] as specified in Table A.1.6.
NOTE: ETSI EN 303 613 [i.1] defines an ITS station based on LTE-V2X in 3GPP Release-14.
6 NR-V2X access layers
6.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 138 211 [25], ETSI TS 138 212 [26], ETSI TS 138 213 [27], ETSI TS 138 214 [28] and ETSI
TS 138 215 [29].
The minimum set of the essential NR-V2X information elements defined in ETSI TS 138 331 [20] and their
default/initial values shall be as in clause A.2, Table A.2.1.
NOTE: Regional regulations may apply to default/initial values.
6.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for NR-V2X sidelink
communications, and shall be as defined in ETSI TS 138 321 [22].
6.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 138 322 [23].
6.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP) and shall be as defined in ETSI TS 138 323 [24].
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15 ETSI EN 303 798 V2.1.1 (2024-08)
6.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 138 331 [20].
6.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 501 [32].
6.7 Additional NR-V2X access layer functionality for
PC5 interface
6.7.1 Transmission/reception of NR-V2X communication over PC5
Additional NR-V2X access layer functionality for transmission/reception of NR-V2X communication over PC5 shall be
compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
6.7.2 QoS management
An ITS station using NR-V2X shall (de)prioritize a data packet according to its Priority value in access layer as defined
in ETSI TS 138 331 [20] and ETSI TS 138 213 [27].
6.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform NR-V2X Communication shall be as defined in ETSI
TS 138 413 [33], ETSI TS 138 414 [34] and ETSI TS 103 574 [19].
6.7.4 Synchronization
An ITS station using NR-V2X shall synchronize with a synchronization reference in both time and frequency before
communicating with other ITS stations using NR-V2X. The Synchronization related functionality of an ITS station
using NR-V2X shall be compliant with ETSI TS 138 331 [20].
An ITS Station may be synchronized to a Cell (gNB/eNB), a GNSS, a SyncRef UE or its own internal clock.
A SyncRef UE transmits a combination of sidelink synchronization signals (S-PSS and S-SSS) called SLSS. There are
672 combinations of these signals, each combination represents a SLSS ID.
A SyncRef UE will indicate in the MIB-SL if it is in coverage of cell/GNSS or not.
An ITS Station may have (pre)configured the synchronization priority for an NR-V2X frequency: sl-SyncPriority (cell
or GNSS).
Five groups of SyncRef UEs:
1) MIB-SL.inCoverage=true and SLSS ID=0: SyncRef UE is in coverage of GNSS.
2) MIB-SL.inCoverage=false and SLSS ID=0: SyncRef UE is out of coverage and sync. to SyncRef UE in ETSI
TS 138 331 [20] coverage of GNSS.
3) MIB-SL.inCoverage=true and SLSS ID={1.335}: SyncRef UE is in coverage of a cell.
4) MIB-SL.inCoverage=false and SLSS ID={1.335}: SyncRef UE is out of coverage and sync. to SyncRef UE
in coverage of a cell.
5) MIB-SL.inCoverage=false and SLSS ID={336.671}: SyncRef UE is out of coverage and sync. to its internal
clock or to a SyncRef UE which is out of coverage.
ETSI
16 ETSI EN 303 798 V2.1.1 (2024-08)
6.8 Cast Management
For NR-V2X, the cast type, i.e. broadcast, groupcast or unicast, shall be passed to the access layer as described in ETSI
TS 103 836-4-3 [37]. For the unicast and groupcast, the destination ID and the destination group ID may be passed to
the access layer respectively.
For the groupcast for an application layer connection-less group (i.e. connection-less groupcast), QoS range shall be
also passed to the access layer as described in ETSI TS 103 836-4-3 [37]. For the groupcast for an application layer
managed group (i.e. connection-oriented groupcast), the member ID and group size shall be also passed to the access
layer as described in ETSI TS 103 836-4-3 [37].
ETSI
17 ETSI EN 303 798 V2.1.1 (2024-08)
Annex A (normative):
Information Elements
A.1 LTE-V2X information elements
The minimum set of the LTE-V2X information elements is defined in ETSI TS 136 331 [1]. Their default/initial values
shall be as specified in Tables A.1.1 to A.1.6. Mandatory values shall be static. Recommended values may be deviated
from, for example by negotiation between devices to improve system performance, or in an ETSI profile, unless
specified otherwise in a deployment profile.
NOTE 1: Any specific deployment can deviate from the default values below under the conditions specified in
ETSI TS 136 331 [1].
Any deviation from default/initial values are documented in the LTE-V2X profile, ETSI TS 103 723 [35].
For the ASN.1 representation of the below described information elements, see clause 6 in ETSI TS 136 331 [1].
NOTE 2: A value can be mandatory (M) or recommended (R).
NOTE 3: Interoperability of implementations of LTE-V2X specified in the present document, with
implementations of ETSI EN 303 613 [i.1], may be achieved by using the default values given in
Annex B of ETSI EN 303 613 [i.1].
ETSI
18 ETSI EN 303 798 V2.1.1 (2024-08)
Table A.1.1: General LTE-V2X information elements
Item LTE-V2X information Value Comment Mandatory/
element (note 1 in clause A.1) Recommended
Value
1 rohc-Profiles All "False" Indicates robust header compression profiles can be supported in M
SL-V2X-Preconfiguration.
2 carrierFreq The carrier frequency of Indicates one E-UTRAN frequency. M
one of the channels See (EU) 2020/1426 [i.4].
regulated in Europe for ITS
communication.
3 maxTxPower 23 Indicates maximal transmit power in dBm per ITS station in the frequency identified in R
item 2.
4 additionalSpectrumEmission NS 33 Indicates the additional spectrum emission requirements and power reduction for protected M
zone. See ETSI TS 136 101 [13].
5 sl-bandwidth n50 for 10 MHz channel. Indicates the carrier bandwidth. See ETSI TS 136 331 [1]. M
n100 for 20 MHz channel.
TDD configuration. The value none means that Frame Structure Type 1 specified in ETSI
6 tdd-ConfigSL None M
TS 136 211 [6] is used.
7 syncAllowed Gnss Indicates the allowed synchronization reference(s) which is (are) allowed to use the M
configured resource pool. In this case, it is a GNSS sync source.
8 syncOffsetIndicators empty Indicates the transmission windows of the sidelink synchronization signalling. By default, M
no syncOffsetIndicators shall be configured. If indicated otherwise or required by regional
regulations, the syncOffsetIndicator1 = 0 and syncOffsetIndicator2 = 80, see clause 5.7.4.
9 threshS-RSSI-CBR 9 Indicates the S-RSSI threshold for determining the contribution of a sub-channel to the M
CBR measurement.
Table A.1.2: LTE-V2X information elements for transmission pools
Item LTE-V2X Value Comment Mandatory/
information element (note 1 in clause A.1) Recommended
Value
1 sl-Subframe bs100-r14 Indicates the bitmap of the resource pool. By default, all bits are set to "1". Other implementation R
options may be considered.
2 adjacencyPSCCH- True Indicates whether an ITS station shall always transmit PSCCH and PSSCH in adjacent Resource M
PSSCH Blocks (RBs).
3 sizeSubchannel 10 Indicates the number of Physical Resource Blocks (PRBs) of each sub-channel in the corresponding M
resource pool.
...
SLOVENSKI STANDARD
01-oktober-2024
Inteligentni transportni sistemi (ITS) - Specifikaciji LTE-V2X in NR-V2X dostopovne
plasti pri inteligentnih transportnih sistemih, ki delujejo v frekvenčnem pasu 5
GHz, 2. izdaja
Intelligent Transport Systems (ITS) - LTE-V2X and NR-V2X Access layer specification
for Intelligent Transport Systems operating in the 5 GHz frequency band - Release 2
Ta slovenski standard je istoveten z: ETSI EN 303 798 V2.1.1 (2024-08)
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
Intelligent Transport Systems (ITS);
LTE-V2X and NR-V2X Access layer specification
for Intelligent Transport Systems operating
in the 5 GHz frequency band;
Release 2
2 ETSI EN 303 798 V2.1.1 (2024-08)
Reference
REN/ITS-00446
Keywords
5G, ITS, layer 1, layer 2, LTE, MAC, radio
ETSI
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ETSI
3 ETSI EN 303 798 V2.1.1 (2024-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 9
4 General requirements . 11
4.1 Architecture . 11
4.2 Operating Frequencies . 12
4.3 Transmit and receive requirement . 12
4.4 Congestion control . 12
4.5 CEN DSRC protection . 12
5 LTE-V2X access layers . 12
5.1 Physical layer . 12
5.2 MAC layer . 13
5.3 RLC layer . 13
5.4 PDCP layer . 13
5.5 RRC layer . 13
5.6 NAS layer . 13
5.7 Additional LTE-V2X access layer functionality for PC5 interface . 13
5.7.1 Transmission/reception of LTE-V2X communication over PC5 . 13
5.7.2 QoS management . 13
5.7.3 PC5 parameter provisioning . 13
5.7.4 Synchronization . 14
5.7.5 Compatibility with ETSI EN 303 613. 14
6 NR-V2X access layers. 14
6.1 Physical layer . 14
6.2 MAC layer . 14
6.3 RLC layer . 14
6.4 PDCP layer . 14
6.5 RRC layer . 15
6.6 NAS layer . 15
6.7 Additional NR-V2X access layer functionality for PC5 interface. 15
6.7.1 Transmission/reception of NR-V2X communication over PC5 . 15
6.7.2 QoS management . 15
6.7.3 PC5 parameter provisioning . 15
6.7.4 Synchronization . 15
6.8 Cast Management . 16
Annex A (normative): Information Elements . 17
A.1 LTE-V2X information elements . 17
A.2 NR-V2X information elements . 20
Annex B (normative): List of MCS-RB prohibited cases (LTE-V2X) . 42
History . 44
ETSI
4 ETSI EN 303 798 V2.1.1 (2024-08)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
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Foreword
This European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS).
National transposition dates
Date of adoption of this EN: 12 August 2024
Date of latest announcement of this EN (doa): 30 November 2024
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 May 2025
Date of withdrawal of any conflicting National Standard (dow): 31 May 2025
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
5 ETSI EN 303 798 V2.1.1 (2024-08)
Introduction
The present document outlines the access layer of the Sidelink (PC5 interface) of cellular based Vehicle to Everything
communication technology specified in ETSI TS 138 300 [21], which can be operated in the 5,9 GHz frequency band
allocated in Europe. NR-V2X and LTE-V2X access layers consist of RRC layer, PDCP layer, RLC layer, MAC layer
and Physical layer. A NAS layer is also introduced as part of the access layer in the present document for the provision
of control. The present document includes requirements for congestion control and for CEN DSRC protection.
The present document does not override regional regulations. The regional regulations apply.
ETSI
6 ETSI EN 303 798 V2.1.1 (2024-08)
1 Scope
The present document defines the physical layer, the data link layer and radio resource configuration, grouped into the
access layer of the ITS station reference architecture ETSI TS 103 898 [i.2]. The access layer technology that is
specified in the present document refers to what is known as the sidelink or PC5 interface of cellular V2X for the
following frequency bands:
• Operation in frequency band dedicated to ITS for safety related applications in the frequency range 5,875 GHz
to 5,925 GHz.
• Operation in frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to
5,875 GHz.
The present document is a revision of ETSI EN 303 613 [i.1], and extends the LTE-V2X access layer specification to
include NR-V2X.
Whether LTE-V2X or NR-V2X is used for message transmission in an ITS channel is determined by a system level
configuration and outside the scope of the present document.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 136 331: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification (3GPP TS 36.331 Release 16)".
[2] ETSI TS 136 300: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved
Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (3GPP
TS 36.300 Release 16)".
[3] ETSI TS 136 321: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access
Control (MAC) protocol specification (3GPP TS 36.321 Release 16)".
[4] ETSI TS 136 322: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link
Control (RLC) protocol specification (3GPP TS 36.322 Release 16)".
[5] ETSI TS 136 323: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data
Convergence Protocol (PDCP) specification (3GPP TS 36.323 Release 16)".
[6] ETSI TS 136 211: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
channels and modulation (3GPP TS 36.211 Release 16)".
[7] ETSI TS 136 212: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing
and channel coding (3GPP TS 36.212 Release 16)".
[8] ETSI TS 136 213: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures (3GPP TS 36.213 Release 16)".
ETSI
7 ETSI EN 303 798 V2.1.1 (2024-08)
[9] ETSI TS 136 214: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer;
Measurements (3GPP TS 36.214 Release 16)".
[10] ETSI TS 123 285: "Universal Mobile Telecommunications System (UMTS); LTE; Architecture
enhancements for V2X services (3GPP TS 23.285 Release 16)".
[11] ETSI TS 124 385: "LTE; V2X services Management Object (MO) (3GPP TS 24.385 Release 16)".
[12] ETSI TS 124 386: "LTE; User Equipment (UE) to V2X control function; protocol aspects; Stage 3
(3GPP TS 24.386 Release 16)".
[13] ETSI TS 136 101: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment
(UE) radio transmission and reception (3GPP TS 36.101 Release 16)".
[14] ETSI TS 136 133: "LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements
for support of radio resource management (3GPP TS 36.133 Release 16)".
[15] ETSI TS 124 301: "Universal Mobile Telecommunications System (UMTS); LTE; 5G;
Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 (3GPP
TS 24.301 Release 16)".
[16] ETSI TS 136 413: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
Application Protocol (S1AP) (3GPP TS 36.413 Release 16)".
[17] ETSI TS 136 414: "LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
data transport (3GPP TS 36.414 Release 16)".
[18] ETSI TS 102 792: "Intelligent Transport Systems (ITS); Mitigation techniques to avoid
interference between European CEN Dedicated Short Range Communication (CEN DSRC)
equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".
[19] ETSI TS 103 574: "Intelligent Transport Systems (ITS); Congestion Control Mechanisms for
C-V2X PC5 interface; Access layer part; Release 2".
[20] ETSI TS 138 331: "5G; NR; Radio Resource Control (RRC); Protocol specification (3GPP
TS 38.331 Release 16)".
[21] ETSI TS 138 300: "5G; NR; NR and NG-RAN Overall description; Stage-2 (3GPP
TS 38.300 Release 16)".
[22] ETSI TS 138 321: "5G; NR; Medium Access Control (MAC) protocol specification (3GPP
TS 38.321 Release 16)".
[23] ETSI TS 138 322: "5G ; NR; Radio Link Control (RLC) protocol specification (3GPP
TS 38.322 Release 16)".
[24] ETSI TS 138 323: "5G; NR; Packet Data Convergence Protocol (PDCP) specification (3GPP
TS 38.323 Release 16)".
[25] ETSI TS 138 211: "5G ; NR; Physical channels and modulation (3GPP TS 38.211 Release 16)".
[26] ETSI TS 138 212: "5G; NR; Multiplexing and channel coding (3GPP TS 38.212 Release 16)".
[27] ETSI TS 138 213: "5G; NR; Physical layer procedures for control (3GPP TS 38.213 Release 16)".
[28] ETSI TS 138 214: "5G; NR; Physical layer procedures for data (3GPP TS 38.214 Release 16)".
[29] ETSI TS 138 215: "5G; NR; Physical layer measurements (3GPP TS 38.215 Release 16)".
[30] ETSI TS 138 101-1: "5G; NR; User Equipment (UE) radio transmission and reception;
Part 1: Range 1 Standalone (3GPP TS 38.101-1 Release 16)".
[31] ETSI TS 138 133: "5G; NR; Requirements for support of radio resource management (3GPP
TS 38.133 Release 16)".
[32] ETSI TS 124 501: "5G; Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3
(3GPP TS 24.501 Release 16)".
ETSI
8 ETSI EN 303 798 V2.1.1 (2024-08)
[33] ETSI TS 138 413: "5G; NG-RAN; NG Application Protocol (NGAP) (3GPP TS 38.413
Release 16)".
[34] ETSI TS 138 414: "5G; NG-RAN; NG data transport (3GPP TS 38.414 Release 16)".
[35] ETSI TS 103 723: "Intelligent Transport Systems (ITS); Profile for LTE-V2X Direct
Communication".
[36] ETSI TS 123 287: "5G; Architecture enhancements for 5G System (5GS) to support
Vehicle-to-Everything (V2X) services (3GPP TS 23.287 Release 16)".
[37] ETSI TS 103 836-4-3: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 3: Media-dependent functionalities for NR-V2X
PC5 and LTE-V2X PC5; Release 2".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 303 613: "Intelligent Transport Systems (ITS); LTE-V2X Access layer specification for
Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI TS 103 898: "Intelligent Transport Systems (ITS); Communications Architecture;
Release 2".
[i.3] ETSI EN 302 571: "Intelligent Transport Systems (ITS); Radiocommunications equipment
operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonised Standard covering the
essential requirements of article 3.2 of Directive 2014/53/EU".
[i.4] Commission Implementing Decision (EU) 2020/1426 of 7 October 2020 on the harmonised use of
radio spectrum in the 5 875-5 935 MHz frequency band for safety-related applications of
intelligent transport systems (ITS) and repealing Decision 2008/671/EC.
[i.5] ECC/DEC/(08)01: "The harmonised use of Safety-Related Intelligent Transport Systems (ITS) in
the 5875-5935 MHz frequency band". Approved 14 March 2008. Latest updated 18 November
2022.
[i.6] ECC Recommendation (08)01: "Use of the band 5855-5875 MHz for Intelligent Transport
Systems (ITS)". Approved 21 February 2008. Amended 3 July 2015.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI TS 103 898 [i.2] and the following apply:
channel busy ratio: portion of sub-channels in the resource pool whose S-RSSI measured by the ITS station exceed a
(pre-)configured threshold sensed over last 100 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9] and is different to the
definition in ETSI EN 302 571 [i.3].
ETSI
9 ETSI EN 303 798 V2.1.1 (2024-08)
channel occupancy ratio: fraction of the total number of sub-channels used by the ITS station for its transmissions out
of the total number of configured (granted) sub-channels over a measurement period of 1 000 ms
NOTE: This definition is access layer dependant and is specified in ETSI TS 136 214 [9].
PC5: interface between the ITS stations used for C-V2X sidelink communication
Resource Block (RB): 7 consecutive symbols in the time domain and 12 consecutive subcarriers in the frequency
domain
resource pool: set of resources that can be used for PSCCH and PSSCH
NOTE: Resource pool is defined with the help of start RB, number of sub-channels, size of sub-channel and
available subframes.
sidelink: radio link between the ITS stations for C-V2X direct communication
sub-channel: set of contiguous physical resource blocks
3.2 Symbols
For the purposes of the present document, the following symbols apply:
IN Interface between access layer and networking & transport layer
IN-SAP Interface between access layer and network & transport layer
MF Interface between management entity and facilities layer
MI Interface between management entity and access layer
MN Interface between management entity and networking & transport layer
MS Interface between management entity and security entity
NF Interface between networking & transport layer and facilities layer
SF Interface between security entity and facilities layer
SI Interface between security entity and access layer
SN Interface between security entity and networking & transport layer
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
rd
3GPP 3 Generation Partnership Project
ACK ACKnowledgement
AM Acknowledged Mode
ARFCN Absolute Radio-Frequency Channel Number
ASN.1 Abstract Syntax Notation One
BSR Buffer Status Report
BW BandWidth
BWP BandWidth Part
CBR Channel Busy Ratio
CEN Comité Européen de Normalisation
CID Context IDentifier
CN Core Network
CR Channel occupancy Ratio
CSI Channel State Information
C-V2X Cellular Vehicle to Everything
DFN Direct Frame Number
DL DownLink
DMRS DeModulation Reference Signal
DRB Data Radio Bearer
DSRC Dedicated Short Range Communications
DTX Discontinuous Transmission
eNB enhance Node B
E-UTRA Evolved Universal Terrestrial Radio Access
E-UTRAN Evolved Universal Terrestrial Radio Access Network
ETSI
10 ETSI EN 303 798 V2.1.1 (2024-08)
FR1 FRequency 1
FR2 FRequency 2
GBR Guaranteed Bit Rate
GFBR Guaranteed Flow Bit Rate
gNB 5G Node B
GNSS Global Navigation Satellite System
HARQ Hybrid Automatic Repeat ReQuest
ID IDentity
IE Information Element
IP Internet Protocol
ITS Intelligent Transport Systems
LCP Link Control Protocol
LTE-V2X Long Term Evolution based Vehicle-to-Everything
M/R Mandatory/Recommended
MAC Medium Access Control
MCS Modulation and Coding Scheme
MCS-RB Modulation and Coding Scheme - Resource Blocks
MFBR Maximum Flow Bit Rate
MIB-SL Master Information Block - SideLink
N/A Not Applicable
NAS Non-Access Stratum
NR New Radio
th
generation) Vehicle to Everything
NR-V2X New Radio (5
NS Network Signalling value
PC5 Proximity-based Communication (Interface) 5
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
PHY PHYsical layer
PPPP ProSe Per-Packet Priority
PQI PC5 QoS Identifier
PRB Physical Resource Block
ProSe Proximity-based Service
PSBCH Physical Sidelink Broadcast CHannel
PSCCH Physical Sidelink Control CHannel
PSFCH Physical Sidelink Feedback CHannel
PSSCH Physical Sidelink Shared CHannel
PTRS Phase Tracking Reference Signal
PUCCH Physical Uplink Control CHannel
PUSCH Physical Uplink Shared CHannel
QAM Quadrature Amplitude Modulation
QoS Quality of Service
RAN Radio Access Network
RB Resource Block
RLC Radio Link Control
RLF Radio Link Failure
RoHC Robust Header Compression
RRC Radio Resource Control
RS Reference Signal
RSRP Reference Signal Received Power
RSSI Received Signal Strength Indication
RSU Road Side Unit
RX Receive
SCI Sidelink Control Information
SCS Sub Carrier Spacing
SDAP Service Data Adaptation Protocol
SDU Service Data Unit
SFN Sub Frame Number
SLSS SideLink Synchronization Signal
SL-SSB SideLink Synchronization Signal Block
SN Sequence Number
SPS Semi Persistent Scheduling
S-PSS (Sidelink) Primary Synchronization Signal
ETSI
11 ETSI EN 303 798 V2.1.1 (2024-08)
SSID Service Set ID
S-SSS (Sidelink) Secondary Synchronization Signal
SyncRef UE Synchronization Reference User Equipment
TB Transport Block
TDD Time Division Duplex
TX Transmit
UCI Uplink Control Information
UE User Equipment
UL UpLink
UM Unacknowledged Mode
V2X Vehicle-to-Everything
4 General requirements
4.1 Architecture
The ITS station architecture specified in ETSI TS 103 898 [i.2] is in Figure 4.1.1. LTE-V2X as defined in ETSI
TS 136 300 [2] and NR-V2X as defined in ETSI TS 138 300 [21] are two of the access layer technologies of the ITS
station architecture.
Applications
ITS applications
Facilities
Logical Link Control (LLC)
Medium Access Control
Protocols
Networking & Transport
Data link
Physical
Access
Figure 4.1.1: Access Layer in the ITS station architecture
A C-V2X access layer is shown in Figure 4.1.2.
IN-SAP
PDCP
RLC
MAC
PHY
C-V2X Access Layer in ITS Station
Figure 4.1.2: C-V2X Access Layer protocol stack
An ITS station that includes a cellular V2X sidelink technology as the access layer shall support LTE-V2X sidelink
communication as defined in ETSI TS 136 300 [2], or NR-V2X sidelink communication as defined in ETSI
TS 138 300 [21], or both. LTE-V2X and NR-V2X are different access layers.
ETSI
MI-SAP
Management
NAS
RRC
12 ETSI EN 303 798 V2.1.1 (2024-08)
NOTE: The present document specifies LTE-V2X and NR-V2X based on 3GPP Release-16 and contains no
backwards compatibility requirements other than those explicitly stated in clause 5.7.5.
4.2 Operating Frequencies
ETSI TS 136 101 [13], clause 5.5G defines the operating band of LTE-V2X.
ETSI TS 138 101-1 [30], clause 5.2E defines the operating bands of NR-V2X.
In Europe, ITS frequency band designation for 5 855 MHz to 5 925 MHz is defined by Commission Implementing
Decision (EU) 2020/1426 [i.4], ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
Band 47 in ETSI TS 136 101 [13] and band n47 in ETSI TS 138 101-1 [30] correspond to the European ITS spectrum
in 5 855 MHz to 5 925 MHz as defined by Commission Implementing Decision (EU) 2020/1426 [i.4],
ECC/DEC/(08)01 [i.5] and ECC Recommendation (08)01 [i.6].
NOTE: While deployment of LTE-V2X and NR-V2X in the same channel could be possible, it is not intended
and is outside the scope of the present document.
4.3 Transmit and receive requirement
An ITS station using LTE-V2X shall fulfil the transmit and receive requirement defined for Band 47 in ETSI
TS 136 101 [13] and ETSI TS 136 133 [14].
An ITS station using NR-V2X shall fulfil the transmit and receive requirement defined for Band n47 in ETSI
TS 138 101-1 [30] and ETSI TS 138 133 [31].
4.4 Congestion control
A C-V2X ITS station shall adapt its CR according to the measured Channel Busy Ratio (CBR) in order to comply with
the required CR limit, as defined in ETSI TS 103 574 [19]. The CBR measurement window shall be as specified in
ETSI TS 103 574 [19] for LTE-V2X and Table A.2.1 row 36 for NR-V2X.
4.5 CEN DSRC protection
An ITS station using LTE-V2X in Band 47 or NR-V2X in Band n47 shall avoid harmful interference to CEN DSRC:
• The ITS station shall be conformant to ETSI TS 102 792 [18].
• If the ITS station is inside the protected zone, it shall adjust its output power level to maximum 10 dBm e.i.r.p.
If the ITS station is inside the protected zone, it shall fulfil the spurious emissions limit of maximum
-65 dBm/MHz within 5 795 MHz to 5 815 MHz.
The upper layers of the ITS station are responsible for detecting that the ITS station is within proximity of CEN DSRC
protection zone according to ETSI TS 102 792 [18] and then sending an indication to access layers to trigger power
level adjustment.
5 LTE-V2X access layers
5.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 136 211 [6], ETSI TS 136 212 [7], ETSI TS 136 213 [8] and ETSI TS 136 214 [9].
The minimum set of the essential LTE-V2X information elements defined in ETSI TS 136 331 [1] and their
default/initial values shall be as in clause A.1, Tables A.1.1 to A.1.6.
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13 ETSI EN 303 798 V2.1.1 (2024-08)
Additionally, for Rel-16 PSSCH transmission, MCS-RB problematic configurations listed in Annex B shall be
excluded.
5.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for LTE-V2X sidelink
communications, and shall be as defined in ETSI TS 136 321 [3].
NOTE: There are two normal modes of channel access in LTE-V2X:
Semi-Persistent Scheduling (SPS).
Event-Based (known as One-Shot).
5.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 136 322 [4].
5.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP), and shall be as defined in ETSI TS 136 323 [5].
5.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 136 331 [1].
5.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 301 [15].
5.7 Additional LTE-V2X access layer functionality for PC5
interface
5.7.1 Transmission/reception of LTE-V2X communication over PC5
Additional LTE-V2X access layer functionality for transmission/reception of LTE-V2X communication over PC5 shall
be compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
5.7.2 QoS management
An ITS station using LTE-V2X shall (de)prioritize a data packet according to its PPPP value in access layer as defined
in ETSI TS 136 331 [1] and ETSI TS 136 213 [8].
5.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform LTE-V2X Communication shall be as defined in ETSI
TS 123 285 [10], ETSI TS 123 287 [36], ETSI TS 136 413 [16], ETSI TS 136 414 [17] and ETSI TS 103 574 [19].
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14 ETSI EN 303 798 V2.1.1 (2024-08)
5.7.4 Synchronization
An ITS station using LTE-V2X shall synchronize with a synchronization reference (e.g. GNSS) in both time and
frequency before communicating with other ITS stations using LTE-V2X. The Synchronization related functionality of
an ITS station using LTE-V2X shall be compliant with ETSI TS 136 331 [1].
For the scenario where ITS station selects synchronization reference on the sidelink (PC5 interface), whether to
(pre-)configure syncOffsetIndicators as defined in ETSI TS 136 331 [1] shall be according to different regions/nations'
implementation. For the case where syncOffsetIndicators is not (pre-)configured, at least RSU ITS station shall be
allowed to transmit sidelink synchronization signalling on the subframes that are not configured to transmit LTE-V2X
messages, e.g. including the reserved subframes calculated according to ETSI TS 136 213 [8] and the subframes
indicated as "0" in sl-Subframe of the transmission pool as per ETSI TS 136 331 [1].
NOTE 1: From transmission-side perspective, whether or not to transmit sidelink synchronization signalling is
based on the ITS station's capability.
NOTE 2: From reception-side perspective, for the case where syncOffsetIndicators is not provided, the parameters
used for sidelink synchronization signalling measurement such as filterCoefficient, syncRefMinHyst and
syncRefDiffHyst may be preconfigured by implementation.
5.7.5 Compatibility with ETSI EN 303 613
For the PHY and MAC layers, an ITS station using LTE-V2X Release-16 shall be backwards compatible with an ITS
station which complies with ETSI EN 303 613 [i.1] as specified in Table A.1.6.
NOTE: ETSI EN 303 613 [i.1] defines an ITS station based on LTE-V2X in 3GPP Release-14.
6 NR-V2X access layers
6.1 Physical layer
The physical layer is mainly responsible for encoding/decoding, modulation/demodulation, etc. and shall be as defined
in ETSI TS 138 211 [25], ETSI TS 138 212 [26], ETSI TS 138 213 [27], ETSI TS 138 214 [28] and ETSI
TS 138 215 [29].
The minimum set of the essential NR-V2X information elements defined in ETSI TS 138 331 [20] and their
default/initial values shall be as in clause A.2, Table A.2.1.
NOTE: Regional regulations may apply to default/initial values.
6.2 MAC layer
The MAC layer of the sidelink (PC5 interface) is mainly responsible for resource allocation for NR-V2X sidelink
communications, and shall be as defined in ETSI TS 138 321 [22].
6.3 RLC layer
The Radio Link Control (RLC) of sidelink (PC5 interface) is mainly responsible for segmentation and concatenation of
SDU, and shall be as defined in ETSI TS 138 322 [23].
6.4 PDCP layer
The PDCP layer of sidelink (PC5 interface) is mainly responsible for differentiating multiple types of SDUs (e.g. IP,
Non-IP) and shall be as defined in ETSI TS 138 323 [24].
ETSI
15 ETSI EN 303 798 V2.1.1 (2024-08)
6.5 RRC layer
The RRC layer of sidelink (PC5 interface) is mainly responsible for access stratum management, and shall be as defined
in ETSI TS 138 331 [20].
6.6 NAS layer
The NAS layer of sidelink (PC5 interface) is mainly responsible for requesting the CN providing subscription
information to the RAN, as well as indicating the RRC layer for RRC establishment cause for PC5 communication, and
shall be as defined in ETSI TS 124 501 [32].
6.7 Additional NR-V2X access layer functionality for
PC5 interface
6.7.1 Transmission/reception of NR-V2X communication over PC5
Additional NR-V2X access layer functionality for transmission/reception of NR-V2X communication over PC5 shall be
compliant with ETSI TS 124 385 [11] and ETSI TS 124 386 [12].
6.7.2 QoS management
An ITS station using NR-V2X shall (de)prioritize a data packet according to its Priority value in access layer as defined
in ETSI TS 138 331 [20] and ETSI TS 138 213 [27].
6.7.3 PC5 parameter provisioning
The required provisioning parameters used by a UE to perform NR-V2X Communication shall be as defined in ETSI
TS 138 413 [33], ETSI TS 138 414 [34] and ETSI TS 103 574 [19].
6.7.4 Synchronization
An ITS station using NR-V2X shall synchronize with a synchronization reference in both time and frequency before
communicating with other ITS stations using NR-V2X. The Synchronization related functionality of an ITS station
using NR-V2X shall be compliant with ETSI TS 138 331 [20].
An ITS Station may be synchronized to a Cell (gNB/eNB), a GNSS, a SyncRef UE or its own internal clock.
A SyncRef UE transmits a combination of sidelink synchronization signals (S-PSS and S-SSS) called SLSS. There are
672 combinations of these signals, each combination represents a SLSS ID.
A SyncRef UE will indicate in the MIB-SL if it is in coverage of cell/GNSS or not.
An ITS Station may have (pre)configured the synchronization priority for an NR-V2X frequency: sl-SyncPriority (cell
or GNSS).
Five groups of SyncRef UEs:
1) MIB-SL.inCoverage=true and SLSS ID=0: SyncRef UE is in coverage of GNSS.
2) MIB-SL.inCoverage=false and SLSS ID=0: SyncRef UE is out of coverage and sync. to SyncRef UE in ETSI
TS 138 331 [20] coverage of GNSS.
3) MIB-SL.inCoverage=true and SLSS ID={1.335}: SyncRef UE is in coverage of a cell.
4) MIB-SL.inCoverage=false and SLSS ID={1.335}: SyncRef UE is out of coverage and sync. to SyncRef UE
in coverage of a cell.
5) MIB-SL.inCoverage=false and SLSS ID={336.671}: SyncRef UE is out of coverage and sync. to its internal
clock or to a SyncRef UE which is out of coverage.
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16 ETSI EN 303 798 V2.1.1 (2024-08)
6.8 Cast Management
For NR-V2X, the cast type, i.e. broadcast, groupcast or unicast, shall be passed to the access layer as described in ETSI
TS 103 836-4-3 [37]. For the unicast and groupcast, the destination ID and the destination group ID may be passed to
the access layer respectively.
For the groupcast for an application layer connection-less group (i.e. connection-less groupcast), QoS range shall be
also passed to the access layer as described in ETSI TS 103 836-4-3 [37]. For the groupcast for an application layer
managed group (i.e. connection-oriented groupcast), the member ID and group size shall be also passed to the access
layer as described in ETSI TS 103 836-4-3 [37].
ETSI
17 ETSI EN 303 798 V2.1.1 (2024-08)
Annex A (normative):
Information Elements
A.1 LTE-V2X information elements
The minimum set of the LTE-V2X information elements is defined in ETSI TS 136 331 [1]. Their default/initial values
shall be as specified in Tables A.1.1 to A.1.6. Mandatory values shall be static. Recommended values may be deviated
from, for example by negotiation between devices to improve system performance, or in an ETSI profile, unless
specified otherwise in a deployment profile.
NOTE 1: Any specific deployment can deviate from the default values below under the conditions specified in
ETSI TS 136 331 [1].
Any deviation from default/initial values are documented in the LTE-V2X profile, ETSI TS 103 723 [35].
For the ASN.1 representation of the below described information elements, see clause 6 in ETSI TS 136 331 [1].
NOTE 2: A value can be mandatory (M) or recommended (R).
NOTE 3: Interoperability of implementations of LTE-V2X specified in the present document, with
implementations of ETSI EN 303 613 [i.1], may be achieved by using the default values given in
Annex B of ETSI EN 303 613 [i.1].
ETSI
18 ETSI EN 303 798 V2.1.1 (2024-08)
Table A.1.1: General LTE-V2X information elements
Item LTE-V2X information Value Comment Mandatory/
element (note 1 in clause A.1) Recommended
Value
1 rohc-Profiles All "False" Indicates robust header compression profiles can be supported in M
SL-V2X-Preconfiguration.
2 carrierFreq The carrier frequency of Indicates one E-UTRAN frequency. M
one of the channels See (EU) 2020/1426 [i.4].
regulated in Europe for ITS
communication.
3 maxTxPower 23 Indicates maximal transmit power in dBm per ITS station in the frequency identified in R
item 2.
4 additionalSpectrumEmission NS 33 Indicates the additional spectrum emission requirements and power reduction for protected M
zone. See ETSI TS 136 101 [13].
5 sl-bandwidth n50 for 10 MHz channel. Indicates the carrier bandwidth. See ETSI TS 136 331 [1].
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