ETSI TS 103 636-4 V1.4.1 (2023-01)

DECT-2020 New Radio (NR); Part 4: MAC layer; Release 1

RTS/DECT-00378

General Information

• Status: Not Published
• Technical Committee: DECT - Digital Enhanced Cordless Telecommunications (DECT)
• Current Stage: 12 - Completion
• Due Date: 10-Jan-2023
• Completion Date: 16-Jan-2023

Standards Content (Sample)

TECHNICAL SPECIFICATION
DECT-2020 New Radio (NR);
Part 4: MAC layer;
Release 1
Release 1 2 ETSI TS 103 636-4 V1.4.1 (2023-01)

Reference
RTS/DECT-00378
Keywords
DECT, DECT-2020, IMT-2020, MAC, NR, radio

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All rights reserved.
ETSI
Release 1 3 ETSI TS 103 636-4 V1.4.1 (2023-01)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 8
3.3 Abbreviations . 8
4 General . 10
4.1 Introduction . 10
4.2 MAC Architecture . 10
4.2.1 General . 10
4.2.2 MAC Structure . 10
4.2.3 Identities . 11
4.2.3.1 Network ID . 11
4.2.3.2 Long Radio Device ID (Long RD ID). 11
4.2.3.3 Short Radio Device ID (Short RD ID) . 12
4.3 Service . 12
4.3.1 Services provided to upper layers . 12
4.3.2 Services expected from physical layer . 13
4.4 Functions . 13
4.5 Channel Structure . 13
4.5.1 Logical and Transport Channels . 13
4.5.2 Mapping Physical layer packet . 14
4.6 Order of transmission and figure numbering conventions . 14
5 MAC Layer Procedures . 15
5.1 Spectrum Management Procedures . 15
5.1.1 General . 15
5.1.2 Operating Channel(s) and Subslot(s) selection . 15
5.1.3 Last Minute Scan . 16
5.1.4 Selecting RD for association . 16
5.1.5 Beaconing Transmissions . 17
5.1.6 Power control . 18
5.2 Broadcast Procedure . 19
5.2.1 General . 19
5.2.2 Broadcast procedure initialization . 19
5.2.3 Broadcast transmission . 19
5.3 Random Access procedure . 19
5.3.1 General . 19
5.3.2 Announcing Random access resources . 20
5.3.3 Random Access transmission . 21
5.3.4 Random Access response . 22
5.4 Scheduled access data transfer . 23
5.4.1 General . 23
5.4.2 Allocating resources for scheduled access . 23
5.4.3 Scheduled access transmission and reception . 24
5.5 HARQ Operation . 25
5.5.1 General . 25
5.5.2 Receiver Operation . 25
5.6 Multiplexing and assembly. 26
5.7 Mobility Procedures . 27
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Release 1 4 ETSI TS 103 636-4 V1.4.1 (2023-01)
5.8 Association procedure . 27
5.8.1 General . 27
5.8.2 Sending beacon for association . 28
5.8.3 Association initiation . 28
5.8.4 Sending association request . 29
5.8.5 Association response. 29
5.8.6 Association Release . 30
5.9 Security Procedures . 30
5.9.1 Mode 1 . 30
5.9.1.1 General . 30
5.9.1.2 Integrity protection . 30
5.9.1.3 Ciphering . 31
5.10 Reconfiguration . 33
6 Protocol Data Units, formats and parameters . 33
6.1 General . 33
6.2 Physical Header Field . 34
6.2.1 General . 34
6.2.2 Coding of Feedback info . 37
6.3 MAC PDU . 39
6.3.1 General . 39
6.3.2 MAC Header type . 40
6.3.3 MAC Common header . 41
6.3.3.1 DATA MAC PDU header . 41
6.3.3.2 Beacon Header . 41
6.3.3.3 Unicast Header . 41
6.3.3.4 RD Broadcasting Header . 42
6.3.4 MAC multiplexing header . 42
6.4 MAC Messages and Information Elements (IEs) . 45
6.4.1 General . 45
6.4.2 MAC messages . 45
6.4.2.1 General . 45
6.4.2.2 Network Beacon message . 45
6.4.2.3 Cluster Beacon message . 46
6.4.2.4 Association Request message. 48
6.4.2.5 Association Response message . 50
6.4.2.6 Association Release message . 51
6.4.2.7 Reconfiguration Request message . 51
6.4.2.8 Reconfiguration Response message . 52
6.4.2.9 Additional MAC message . 53
6.4.3 MAC information elements . 53
6.4.3.1 MAC Security Info IE . 53
6.4.3.2 Route Info IE . 54
6.4.3.3 Resource allocation IE . 54
6.4.3.4 Random Access Resource IE . 57
6.4.3.5 RD Capability IE . 58
6.4.3.6 Neighbouring IE . 60
6.4.3.7 Broadcast Indication IE . 61
6.4.3.8 Padding IE . 62
6.4.3.9 Group Assignment IE . 62
6.4.3.10 Load Info IE . 63
6.4.3.11 Configuration Request IE . 64
6.4.3.12 Measurement Report IE . 64
6.4.3.13 Radio Device Status IE . 65
7 Variables, and Timers. 65
7.1 General . 65
7.2 Variables. 66
7.3 Timers . 67
Annex A (normative): MAC Layer Requirements for Radio Device Capabilities . 68
A.1 Introduction . 68
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Release 1 5 ETSI TS 103 636-4 V1.4.1 (2023-01)
A.2 Radio Device Capabilities . 68
A.2.0 Release . 68
A.2.1 Operating Modes . 68
A.2.2 System Operation . 68
A.2.3 Security . 68
A.2.4 Scheduled data transfer service . 68
A.2.5 Feedback Info Formats . 68
A.2.6 HARQ feedback delay . 69
Annex B (normative): Void . 70
Annex C (informative): Change History . 71
History . 72

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Release 1 6 ETSI TS 103 636-4 V1.4.1 (2023-01)
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Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Digital Enhanced Cordless
Telecommunications (DECT).
The present document is part 4 of a multi-part deliverable covering the DECT-2020 New Radio (NR) technology. Full
details of the entire series can be found in part 1 [1].
DECT-2020 NR is recognized in Recommendation ITU-R M.2150 [i.2] as a component RIT fulfilling the IMT-2020
requirements of the IMT-2020 use scenarios URLLC and mMTC. The Set of Radio Interface Technology (SRIT) called
"DECT 5G SRIT" is involving 3GPP NR and DECT-2020 NR.
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.

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Release 1 7 ETSI TS 103 636-4 V1.4.1 (2023-01)
1 Scope
The present document is one of the parts of the specification of the DECT-2020 New Radio (NR).
The present document specifies the Medium Access Control (MAC) layer and interactions between the MAC layer and
physical layer and higher layers.
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 103 636-1: "DECT-2020 New Radio (NR); Part 1: Overview; Release 1".
[2] ETSI TS 103 636-2: "DECT-2020 New Radio (NR); Part 2: Radio reception and transmission
requirements; Release 1".
[3] ETSI TS 103 636-3: "DECT-2020 New Radio (NR); Part 3: Physical layer; Release 1".
[4] FIPS PUB 197: "Advanced Encryption Standard (AES)".
[5] NIST Special Publication 800-38B: "Recommendation for Block Cipher Modes of Operation: The
CMAC Mode for Authentication".
[6] ETSI TS 103 636-5: "DECT-2020 New Radio (NR); Part 5: DLC and Convergence layers;
Release 1".
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 300 175 (all parts): "Digital Enhanced Cordless Telecommunications (DECT); Common
Interface (CI)".
[i.2] Recommendation ITU-R M.2150: "Detailed specifications of the terrestrial radio interfaces of
International Mobile Telecommunications-2020 (IMT-2020)".
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Release 1 8 ETSI TS 103 636-4 V1.4.1 (2023-01)
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
Fixed Termination point (FT): operational mode of an RD where the RD initiates, coordinates local radio resources,
and provides information on how other RDs may connect and communicate with it
operating channel: single continuous part of the radio spectrum with a defined bandwidth where RDs transmit and/or
receive as defined in ETSI TS 103 636-2 [2]
Portable Termination point (PT): operational mode of RD where RD selects another RD, which is in FT mode, for
association
Radio Device (RD): device with radio transmission and reception capability which can operate in FT and/or PT mode
resource: variable length time unit defined in subslot(s) or slot(s) in the single operating channel that an RD is using for
transmission or reception of a physical layer packet
NOTE: Resource can be contentious or contention free, i.e. scheduled.
slot: unit of a radio frame as defined in ETSI TS 103 636-3 [3], clause 4
subslot: unit of a radio frame as defined in ETSI TS 103 636-3 [3], clause 4
NOTE: Subslots in the frame are numbered in increasing order and the first subslot of the radio frame is
number 0.
3.2 Symbols
For the purposes of the present document, the following symbols apply:
0x Value in hexadecimals
β Fourier transform scaling factor
NOTE: As defined in ETSI TS 103 636-3 [3].
μ Subcarrier scaling factor
NOTE: As defined in ETSI TS 103 636-3 [3].
RSSI-1 RSSI-1 measurement
NOTE: As defined in ETSI TS 103 636-2 [2].
RSSI-2 RSSI-2 measurement
NOTE: As defined in ETSI TS 103 636-2 [2].
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI TS 103 636-1 [1] and the following apply:
NOTE: An abbreviation defined in the present document takes precedence over the definition of the same
abbreviation, if any, in ETSI TS 103 636-1 [1].
ACK Acknowledgement
BCC Broadcast Control
BCCH Broadcast Control Channel
BLER Block Error Ratio
BS Buffer Size
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BSC Beacon Scanning Control
CCC Connection Configuration Control
CCCH Common Control Channel
CMAC Cipher-based Message Authentication Code
CQI Channel Quality Indicator
CTR Counter mode
DCCH Dedicated Control Channel
DCH Dedicated Channel
DF Data Field
NOTE: As defined in ETSI TS 103 636-3 [3].
DTCH Dedicated Traffic Channel
FO Frame Offset
FT Fixed Termination point
GI Guard Interval
NOTE: As defined in ETSI TS 103 636-3 [3].
HARQ Hybrid Automatic Repeat reQuest
HPC Hyper Packet Counter
HW Hardware
ID Identity
IE Information Element
IV Initialization Vector
LBT Listen Before Talk
LRC Local Radio Control
MCS Modulation and Coding Scheme
MIC Message Integrity Code
NOTE: Same as Message Authentication Code.
MIMO Multiple Input Multiple Output
MSB Most Significant Bit
MTCH Multicast (Broadcast) Traffic Channel
MUX Multiplexing
NA Not Applicable
NACK Negative Acknowledgement
NSS Number of Spatial Streams
OFDM Orthogonal Frequency Division Multiplexing
PCC Physical Control Channel
PCCH Paging Common Channel
PCH/BCH Paging and Broadcast Channel
PDC Physical Data Channel
PDU Protocol Data Unit
PSN Packet Sequence Number
PT Portable Termination point
PTC Paging Transmission Control
RAC Random Access Control
RACH Random Access Channel
RD Radio Device
RSSI Received Signal Strength Indicator
SDU Service Data Unit
SFN System Frame Number
SNR Signal to Noise Ratio
STF Synchronization Training Field
NOTE: As defined in ETSI TS 103 636-3 [3].
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Release 1 10 ETSI TS 103 636-4 V1.4.1 (2023-01)
4 General
4.1 Introduction
The objective of this clause is to describe the MAC protocol layer architecture, used identities, used transport channels
and mapping MAC PDU into physical layer packet.
4.2 MAC Architecture
4.2.1 General
This clause describes a model of the MAC i.e. it does not specify or restrict implementations.
4.2.2 MAC Structure
The overall MAC structure is depicted in Figure 4.2.2-1. MAC provides DTCH and MTCH logical channels for
transferring higher layer data. The flow of the higher layer data and MAC internal messages to physical channels is
depicted with black solid lines. The grey dashed line corresponds to MAC internal control interfaces between MAC
functions and the MAC control entity.
Upper layers
DTCH MTCH
MAC Control Entity
PCCH BCCH CCCH DCCH
Logical Channel Prioritization (UL&DL)
(De-) (De-)
(De-) Multiplexing
Multiplexing Multiplexing
MAC security
HARQ
PCH/
DCH RACH
BCH
Physical layer
Figure 4.2.2-1: MAC structure overview
The MAC layer of the Radio Device (RD) handles the transmission and reception of the following transport channels:
• Paging and Broadcast Channel (PCH/BCH);
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• Dedicated Channel (DCH);
• Random Access Channel (RACH).
MAC Control Entity
Beacon Scanning control
Local radio control (LRC):
(BSC):
Random Access control
Broadcast control (BCC)
(RAC)
Connection configuration Paging transmission
control (CCC) control (PTC)
Figure 4.2.2-2: MAC control Entity
The MAC control entity is depicted in Figure 4.2.2-2 and described in clause 4.4.
4.2.3 Identities
4.2.3.1 Network ID
The Network ID has a length of 32 bits, and the first 24 MSB bits are used to identify a DECT-2020 network uniquely
from other DECT-2020 networks. The 8 LSB bits of the network are selected locally to minimize collision with other
networks.
The network ID is transmitted periodically in beacon messages as plain text enabling other RDs to detect which
network the transmitted beacon belongs to.
The last 8 LSB bits of the network ID are transmitted in the PHY control field of the packet as defined in clause 6.2.
The 24 MSB bits of the network ID are provided to the PHY layer to initialize the PDC scrambling sequence in
clause 7.6.6 of ETSI TS 103 636-3 [3].
The network ID can be set to any other value than 0x00000000.
NOTE: The Network ID should be set in such a manner that the maximum likelihood for a unique identity for a
network is obtained due to randomness of 2 to the power of 32.
4.2.3.2 Long Radio Device ID (Long RD ID)
The Long radio device ID has a length of 32 bits, and it identifies a radio device uniquely in a single DECT-2020
network. The coding of the Long RD ID is defined in Table 4.2.3.2-1. An RD obtains the Long RD ID as part of the
authentication process over the DECT-2020 NR system or via manual provision or by using other communication
channels.
The Long RD ID is used in:
• an association procedure to recognize associating RDs uniquely;
• MAC layer security procedures;
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Release 1 12 ETSI TS 103 636-4 V1.4.1 (2023-01)
• packet routing in mesh system operation to identify the original source and the final target receiver of the
routed data packet as defined in ETSI TS 103 636-5 [6].
Table 4.2.3.2-1: Use of Long RD ID address space
Address type Address field Comment
Reserved address 0x00000000 Shall not be used as it is considered as not defined.
Backend address 0xFFFFFFFE Indicates that a packet is to be delivered out from the DECT-2020 system, i.e. to a
backend system.
Broadcast address 0xFFFFFFFF This address can be used to indicate that a packet needs to be received by all
RDs in the system when performing packet routing.
Long RD ID 0x00000001- This address space is used to identify a radio device uniquely in a DECT-2020
0xFFFFFFFD system.
Multicast address 0x00000001- The system configuration defines a range of addresses that are used as multicast
0xFFFFFFFD addresses in the given system.
A multicast group can use any of those addresses. When the receiver address of
the packet is a multicast group the packet is intended for all members of that
group.
An RD can be part of one or multiple multicast groups.

The Long RD ID is transmitted in a MAC PDU to:
• identify the receiver and the transmitter of the packet in the association procedure for exchanging Short RD
IDs; or
• when the transmitter of the MAC PDU considers that there is a potential confusion on Short RD IDs.
When an RD is initiating authentication over a DECT-2020 NR network the RD can use a random value or application
defined value as a Long RD ID from the Long RD ID space defined in Table 4.2.3.2-1, if no valid Long RD ID value is
available from the previous authentication procedures.
4.2.3.3 Short Radio Device ID (Short RD ID)
The Short radio device ID has a length of 16 bits, and it identifies a radio device locally in a DECT-2020 NR network.
The coding of the Short RD ID is defined in Table 4.2.3.3-1.
The Short RD ID is used in the PHY control field as in transmitter or receiver fields to identify the transmitter and the
receiver of the packet.
The Short RD ID is exchanged during the association procedure between RDs performing association so that linkage
between Short RD ID and Long RD ID is obtained by both associating RD. Each radio device randomly selects a Short
RD ID value that it uses in the association.
Table 4.2.3.3-1: Use of Short RD ID address space
Address type Address field Comment
Reserved address 0x0000 Shall not be used as it is considered as not defined
Short RD ID 0x0001- This address space is used to identify RD in the PHY control field
0xFFFE
Broadcast address 0xFFFF This address can be used to indicate that transmission is a broadcast MAC
PDU
4.3 Service
4.3.1 Services provided to upper layers
The MAC layer provides the following services to upper layers:
• data transfer;
• radio resource allocation.
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4.3.2 Services expected from physical layer
The MAC layer expects the following services from the physical layer:
• data transfer services in physical layer packets;
• measurements.
4.4 Functions
The MAC layer supports the following control functions in the MAC control entity:
• Local Radio Control (LRC): This function is overall in charge of the radio resource in the local coordination
area, when the RD coordinates local radio resources, i.e. operates as an FT.
• Paging Transmission Control (PTC): This function controls paging message transmission when the RD
coordinates local radio resources, i.e. operates as FT.
• Broadcast Control (BCC): This functionality controls Beacons and other broadcast/multicast transmissions.
• Random Access Control (RAC): This functionality is in charge of random access transmissions.
• Beacon Scanning Control (BSC): This function controls scanning operations.
• Connection Configuration Control (CCC): This functionality controls multiplexing, mapping data to transport
channels, MCS, HARQ configuration, MAC security and handovers with LRC.
The MAC layer supports the following transmission functions:
• paging and broadcast signalling;
• control signalling;
• radio resource management by channel selection and channel access procedures;
• logical channel prioritization;
• mapping between logical channels and transport channels;
• multiplexing of MAC SDUs from one or different logical channels onto the MAC PDU to be delivered to the
physical layer via transport channels;
• demultiplexing of MAC SDUs to one or different logical channels from transport blocks MAC PDU delivered
from the physical layer via transport channels;
• error correction through HARQ;
• MAC layer security by providing integrity protection and ciphering.
4.5 Channel Structure
4.5.1 Logical and Transport Channels
The MAC layer provides data transfer services on logical channels. To accommodate different kinds of data transfer
services, multiple types of logical channels are defined i.e. each supporting transfer of a particular type of information.
Each logical channel type is defined by what type of information is transferred. The MAC has a set of internal logical
channels and logical channels to higher layers.
The MAC layer has the control and traffic channels listed in Table 4.5.1-1.
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Table 4.5.1-1: Logical channels provided by MAC
Logical channel name Acronym Available for higher layers Control channel Traffic channel
Broadcast Control Channel BCCH X
Paging Control Channel PCCH X
Common Control Channel CCCH X
Dedicated Control Channel DCCH X
Dedicated Traffic Channel DTCH X X
Multicast Traffic Channel MTCH X X

The MAC sublayer uses the transport channels listed in Table 4.5.1-2.
Table 4.5.1-2: Transport channels used by MAC
Transport channel name Acronym Downlink Uplink
Paging and Broadcast Channel PCH/BCH X
Dedicated Channel DCH X X
Random Access Channel RACH X X

Logical channels can be mapped as described in Table 4.5.1-3.
Table 4.5.1-3: Channel mapping
Transport channel PCH/BCH DCH RACH
Logical channel
BCCH X
PCCH X
CCCH  X
DCCH X X X
DTCH X X
MTCH X X
4.5.2 Mapping Physical layer packet
In packet transmissions transport channels are mapped to Physical Data Channels (PDC) carried in a physical layer
packet. Additionally, the MAC provides the number of used spatial streams, and the content of the Physical Layer
Control Field to the physical layer. The Physical Layer Control Field is mapped to a Physical Control Channel (PCC) of
the physical layer packet.
4.6 Order of transmission and figure numbering conventions
The transmission order is Big endian and left to right:
st
• A list of octets is transmitted 1 octet first.
• For each octet, bits are numbered 0 to 7 according to the transmission order. Bit 0 is transmitted first
(ascending transmission order).
• When bits are numbered in any other MAC structure, they are also numbered according to transmission order.
Whenever an octet or other container represents a numeric quantity the left most bit in the diagram and thus, the first to
be transmitted, is the high order or most significant bit.
For octets, the bit labelled 0 is the most significant bit and bit 7 is the least significant bit.
st st
When referring to the bits of a numerical value, ordinal numbers starting by 1 can be used to refer to the bits. 1 bit
nd
means the most significant bit, 2 bit means the second MSB (note that if the value is placed in an octet the first bit is
nd rd
transmitted in bit 0). Last bit, 2 last, 3 last, etc. can be used to refer to the 3 least significant bits of the number.
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Release 1 15 ETSI TS 103 636-4 V1.4.1 (2023-01)
NOTE: The transmission order (endianness and bit transmission order) is identical to DECT (ETSI
EN 300 175 [i.1], parts 1 to 8). However the numbering convention in figures (bit numbering in octets
carrying numeric values) has been reversed to follow generally accepted conventions.
5 MAC Layer Procedures
5.1 Spectrum Management Procedures
5.1.1 General
An RD shall support the set of cognitive radio spectrum management features, defined in clause 5.1.
In each connection between two RDs, one RD is in FT mode and the other RD is in PT mode. The RD in FT mode
coordinates local radio resources and p
...