Intelligent transport systems — Evolved universal terrestrial radio access network (E-UTRAN) — Part 2: Device to device communications (D2D)

This document provides specification on the ITS-Station (ITS-S) access layer for a communication interface (CI) named "ITS-LTE-D2D". This specification is appropriate in the context of LTE-D2D communications that are being used for the dissemination of ITS information from an ITS-SU to other ITS-SUs, where these ITS-SUs can be either vehicle ITS-SUs, roadside ITS-SUs, or personal ITS-SUs, as specified in ISO 21217. It provides a combination of options from relevant ETSI/3GPP releases and ITS-station management standards in ISO 24102 to enable and achieve this objective. ITS-LTE-D2D CIs are based on the evolved-universal terrestrial radio access network (E-UTRAN) device-to-device (LTE-D2D) technology standardized at 3GPP Release 13. This document enables the use of the LTE-D2D technology as an ITS access technology in an ITS station by reference to respective specifications from 3GPP, and by specifying details of the Communication Adaptation Layer (CAL) and the Management Adaptation Entity (MAE) of CIs specified in ISO 21218.

Systèmes intelligents de transport — Réseau d'accès à la radio terrestre universelle évoluée (E-UTRAN) — Partie 2: Communications directe entre appareils (D2D)

General Information

Status
Published
Publication Date
03-Aug-2020
Current Stage
6060 - International Standard published
Start Date
04-Aug-2020
Completion Date
04-Aug-2020
Ref Project

Buy Standard

Standard
ISO 17515-2:2020 - Intelligent transport systems -- Evolved universal terrestrial radio access network (E-UTRAN)
English language
26 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 17515-2
First edition
2020-08
Intelligent transport systems —
Evolved universal terrestrial radio
access network (E-UTRAN) —
Part 2:
Device to device communications
(D2D)
Systèmes intelligents de transport — Réseau d'accès à la radio
terrestre universelle évoluée (E-UTRAN) —
Partie 2: Communications directe entre appareils (D2D)
Reference number
ISO 17515-2:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 17515-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 17515-2:2020(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Usage of LTE in ITS .............................................................................................................................................................................................. 3

5.1 LTE features used in ITS .................................................................................................................................................................. 3

5.2 Device-to-device communications (D2D) ........................................................................................................................ 3

5.3 D2D communication basics .......................................................................................................................................................... 5

5.3.1 General...................................................................................................................................................................................... 5

5.3.2 User plane .............................................................................................................................................................................. 5

5.3.3 Control plane ....................................................................................................................................................................... 6

5.4 Service authorization ........................................................................................................................................................................ 6

5.5 SideLink communication related identities ................................................................................................................... 7

6 General requirements ..................................................................................................................................................................................... 7

7 ITS station .................................................................................................................................................................................................................... 8

7.1 ITS station and communication architecture ............................................................................................................... 8

7.2 Service access points ......................................................................................................................................................................... 9

7.2.1 General...................................................................................................................................................................................... 9

7.2.2 Communications service access points .....................................................................................................10

7.2.3 Management service access points ...............................................................................................................10

7.2.4 Security service access points ...........................................................................................................................10

8 Communication interface (CI) protocol stack .....................................................................................................................10

8.1 Physical layer .........................................................................................................................................................................................10

8.2 Data link layer .......................................................................................................................................................................................10

8.2.1 Basic behaviour ..............................................................................................................................................................10

8.2.2 Data link layer communication addresses ..............................................................................................10

8.2.3 Identification of higher layer protocols.....................................................................................................10

8.3 Communication adaptation sub-layer .............................................................................................................................11

9 Communication interface (CI) management ........................................................................................................................11

9.1 Basic management ............................................................................................................................................................................11

9.2 Management adaptation entity (MAE) ............................................................................................................................11

9.2.1 LTE-D2D parameters and I-Parameters ....................................................................................................11

9.2.2 LTE-D2D management commands and MI-SAP commands and requests ..................11

10 Procedures ...............................................................................................................................................................................................................12

10.1 Communication interface (CI) procedures ..................................................................................................................12

10.1.1 Transmit procedure ...................................................................................................................................................12

10.1.2 Receive procedure .......................................................................................................................................................12

10.2 Management procedures ............................................................................................................................................................12

10.2.1 Cross-CI prioritization .............................................................................................................................................12

10.2.2 Operational mode ........................................................................................................................................................12

10.2.3 LTE-D2D MAC address mapping .....................................................................................................................12

10.2.4 CI connection procedure ........................................................................................................................................14

10.2.5 CI state management .................................................................................................................................................14

11 Conformance ..........................................................................................................................................................................................................14

12 Test methods ..........................................................................................................................................................................................................14

Annex A (normative) Communication interface (CI) parameters .......................................................................................15

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 17515-2:2020(E)

Annex B (normative) MI-COMMANDs ...............................................................................................................................................................18

Annex C (normative) MI-REQUESTs ....................................................................................................................................................................19

Annex D (normative) ASN.1 definitions ..........................................................................................................................................................20

Annex E (informative) CI state transitions ..................................................................................................................................................23

Bibliography .............................................................................................................................................................................................................................25

iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 17515-2:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

A list of all parts in the ISO 17515 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 17515-2:2020(E)
Introduction

Localized communications are an essential component of hybrid communications in Intelligent

Transport Systems (ITS). Various access technologies are suited for localized communications. An

increasing interest from ITS stakeholders in "Cooperative ITS" and "Urban ITS" is focussed on the access

technology known as LTE, which refers to a packet switched cellular network technology specified by

3GPP. In addition to the "traditional" features of cellular networks, LTE also supports device-to-device

communications (LTE-D2D) which can be efficiently used for ITS.

This document provides complements to LTE-D2D specifications from 3GPP needed to operate it as

an ITS access technology in an ITS station unit as specified in ISO 21217. An implementation of this

document is referred to as an ITS-LTE-D2D communication interface (CI).
ITS-LTE-D2D CIs are capable of:
— operating with the support of an LTE base station, and

— operating without the support of an LTE base station, e.g. outside an LTE coverage area,

as specified by 3GPP.
vi © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 17515-2:2020(E)
Intelligent transport systems — Evolved universal
terrestrial radio access network (E-UTRAN) —
Part 2:
Device to device communications (D2D)
1 Scope

This document provides specification on the ITS-Station (ITS-S) access layer for a communication

interface (CI) named "ITS-LTE-D2D".

This specification is appropriate in the context of LTE-D2D communications that are being used for

the dissemination of ITS information from an ITS-SU to other ITS-SUs, where these ITS-SUs can be

either vehicle ITS-SUs, roadside ITS-SUs, or personal ITS-SUs, as specified in ISO 21217. It provides a

combination of options from relevant ETSI/3GPP releases and ITS-station management standards in

ISO 24102 to enable and achieve this objective.

ITS-LTE-D2D CIs are based on the evolved-universal terrestrial radio access network (E-UTRAN)

device-to-device (LTE-D2D) technology standardized at 3GPP Release 13.

This document enables the use of the LTE-D2D technology as an ITS access technology in an ITS station

by reference to respective specifications from 3GPP, and by specifying details of the Communication

Adaptation Layer (CAL) and the Management Adaptation Entity (MAE) of CIs specified in ISO 21218.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/IEC 8825-2, Information technology — ASN.1 encoding rules: Specification of Packed Encoding Rules

(PER) — Part 2

ISO 21218, Intelligent transport systems — Hybrid communications — Access technology support

ISO 24102-3, Intelligent transport systems — ITS station management — Part 3: Service access points

3GPP TS 23.303, 3rd Generation Partnership Project; Technical Specification Group Services and System

Aspects; Proximity-based services (ProSe); Stage 2 (Release 13)

3GPP TS 24.334 V15.1.0, 3rd Generation Partnership Project; Technical Specification Group Services

and System Aspects; Proximity-services (ProSe) User Equipment (UE) to ProSe function protocol aspects

(Release 13)

3GPP TS 36.300, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network;

Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access

Network (E-UTRAN); Overall description; Stage 2 (Release 13)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2020 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO 17515-2:2020(E)

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
SideLink
UE to UE interface for direct communication between two or more nearby UEs

Note 1 to entry: The Sidelink corresponds to the PC5 (3.2) interface as defined in 3GPP TS 23.303.

[SOURCE: 3GPP TS 36.300]
3.2
PC5

reference point between ProSe-enabled UEs used for control and user plane for ProSe Direct Discovery

and ProSe Direct Communication

Note 1 to entry: The lower protocol layers of the PC5 reference point can be based on E-UTRA SideLink (3.1)

capabilities.
[SOURCE: 3GPP TS 36.300]
4 Symbols and abbreviated terms
CAL communication adaptation sub-layer
CI communication interface
D2D device-to-device
eNB evolved node B
E-UTRA evolved universal terrestrial radio access
E-UTRAN evolved universal terrestrial radio access network
HSS home subscriber subsystem
ITS intelligent transport systems
ITS-SU ITS station unit
LCID logical channel identifier
MAE management adaptation entity
PPPP ProSe per packet priority
ProSe Proximity based service
RNTI radio network temporary identifier
SL SideLink
SL-RNTI SideLink RNTI
SL-SCH SideLink shared channel
2 © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 17515-2:2020(E)
UE user equipment (mobile LTE device)
UM unacknowledged mode
VCI virtual CI
5 Usage of LTE in ITS
5.1 LTE features used in ITS

The LTE network is a packet-switched cellular network specified by 3GPP. It provides features that may

be used in ITS station units (ITS-SUs), namely device-to-device communications (D2D) as described in 5.2.

5.2 Device-to-device communications (D2D)

D2D communications in LTE (LTE-D2D) are possible via LTE interface, i.e. the LTE PC5 (UE-UE)

communications interface.

The initial primary purpose of LTE-D2D communications identified so far by 3GPP provides proximity

services by using direct communications between UEs, see 3GPP TS 36.300, for example. LTE-D2D

communications can be used for the dissemination of ITS information from an ITS-SU to other ITS-SUs:

see 3GPP TR 23 303, for example, where these ITS-SUs can be either vehicle ITS-SUs, roadside ITS-SUs,

or personal ITS-SUs as specified in ISO 21217.

PC5 is an interface between UE to UE used for direct communications in an LTE-D2D network. In PC5

communications, information dissemination goes directly from a UE to other UEs.

PC5 communications are also referred to as SideLink communications. Two operational modes of

SideLink communications exist:
— operator managed;
1) with dynamic scheduling of resources;
2) without dynamic scheduling of resources;
— non-operator managed.
Table 1 shows the operational modes of E-UTRAN D2D.
Table 1 — Operational modes of E-UTRAN D2D
Served by E-UTRAN Not served by E-UTRAN Out-of-coverage
Scheduled mode eNB indicates the physical radio resource N/A
to be used on a UE-specific basis
(Mode 1)

Autonomous mode A UE on its own selects radio resource A UE on its own selects radio resource

from resource pools allocated on a non-UE from resource pools allocated on a non-UE

(Mode 2)
specific basis specific basis

eNB indicates the physical resource pool eNB indicates the physical resource pool

configuration (via SIB or RRC signalling) configuration (via SIB or RRC signalling)

In the operator-managed mode, the UE may either use communication resources scheduled by the

LTE network or select resources autonomously among resources which are pre-configured by the LTE

network; these resources are reserved for data communications of the LTE-D2D CI.

In accordance with ETSI/3GPP, the non-operator managed mode, the UE may on its own select resources

among pre-configured resources which are stored in UEs.
© ISO 2020 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO 17515-2:2020(E)
In D2D communications, there exist 4 types of scenarios.

a) Scenario A (see Figure 1) can be used for non-operator managed D2D communication where UEs

are located out of LTE network coverage.
Figure 1 — D2D scenario A

b) Scenario B (see Figure 2) can be used for non-operator managed D2D communication where one

of UE is located out of LTE network coverage. Also, it can be used for ProSe UE-to-Network Relay

communication which supports LTE network connectivity to UEs located out of LTE network

coverage.
Figure 2 — D2D scenario B

c) Scenario C (see Figure 3) is for operator managed D2D communication in one LTE base station.

Figure 3 — D2D scenario C

d) Scenario D (see Figure 4) is for operator managed D2D communication in different LTE base

stations.
4 © ISO 2020 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 17515-2:2020(E)
Figure 4 — D2D scenario D (3GPP 36.843)

In this document, D2D scenarios A, B, and C are considered and specifications for use in the C-ITS

context are provided.
5.3 D2D communication basics
5.3.1 General

In D2D communications, in accordance with 3GPP 36.300, the UE supporting SideLink communication

can operate in two modes for resource allocation:
— Scheduled resource allocation is characterized by:

— UE requests resources for SideLink communication to the eNB. The eNB schedules resources for

transmission of SideLink control information and data;

— UE receives the scheduled resource for SideLink communication and transmits Sidelink control

information and data via the resource.
— UE autonomous resource selection is characterized by:

— A UE on its own selecting resources among pre-configured resources. Sidelink communication

is performed by managing Sidelink control information and data.
5.3.2 User plane

Figure 5 shows the protocol stack for the user plane, where PDCP, RLC, MAC, and PHY sublayers

(terminated at the UE) perform the functions for the user plane.
Figure 5 — User-Plane protocol stack for SideLink communication
© ISO 2020 – All rights reserved 5
---------------------- Page: 11 ----------------------
ISO 17515-2:2020(E)
5.3.3 Control plane

A UE does not establish and maintain a logical connection between UEs for SideLink communication

except for one-to-one SideLink communication including ProSe UE-to-Network Relay operation. The

control plane for one-to-one SideLink communication is shown in Figure 6.
Figure 6 — Control-Plane protocol stack for one-to-one SideLink communication
5.4 Service authorization

Service authorization and revocation for LTE-D2D communication is performed for allowing UE’s D2D

communication as specified in 3GPP TS23.303.

In accordance with 3GPP, the LTE network pre-configures the UE with the authorization information for

a list of networks where the UE is authorized to perform direct communication. If there is no associated

UE context, the ProSe Function gets the subscription information for ProSe direct communication from

HSS in Figure 7.
Figure 7 — Pre-configuration for ProSe direct communication

The UE gets the service authorization for ProSe direct communication with a given validity time, from

the ProSe Function of the HPLMN (see Figure 8).
6 © ISO 2020 – All rights reserved
---------------------- Page: 12 ----------------------
ISO 17515-2:2020(E)
Figure 8 — Service authorization for ProSe direct communication
5.5 SideLink communication related identities
The following identities are used for SideLink communication:

— SL-RNTI (SideLink Radio Network Temporary Identifier): Unique identification used for SideLink

communication scheduling;

— Source Layer-2 ID: Identifies the sender of the data in SideLink communication. The Source Layer-2

ID is 24 bits long and is used together with Destination Layer-2 ID and LCID for identification of the

RLC UM entity and PDCP entity in the receiver;

— Destination Layer-2 ID: Identifies the target of the data in SideLink communication. The Destination

Layer-2 ID is 24 bits long and is split in the MAC layer into two bit strings:

1) One bit string is the LSB part (8 bits) of Destination Layer-2 ID and is forwarded to the physical

layer as Group Destination ID. This identifies the target of the intended data in SideLink control

information and is used for filtering of packets at the physical layer.

2) The second bit string is the MSB part (16 bits) of the Destination Layer-2 ID and is carried

within the MAC header. This is used for filtering of packets at the MAC layer.

No Access Stratum signalling is required for group formation and to configure Source Layer-2 ID,

Destination Layer-2 ID and Group Destination ID in the UE. These identities are either provided by a

higher layer or derived from identities provided by a higher layer. In case of groupcast and broadcast,

[11]

the ProSe UE ID provided by the higher layer is used directly as the Source Layer-2 ID and the ProSe

[11]

Layer-2 Group ID provided by the higher layer is used directly as the Destination Layer-2 ID in the

MAC layer. In case of one-to-one communications, the higher layer provides Source Layer-2 ID and

Destination Layer-2 ID.
6 General requirements

An implementation of an ITS-LTE-D2D CI is based on relevant specifications from 3GPP:

— 3GPP TS 23.303,
— 3GPP TS 24.334 V15.1.0, and
— 3GPP TS 36.300.

NOTE Further 3GPP specifications related to LTE-D2D and referenced in the basic specifications are e.g.

[11] - [20].
© ISO 2020 – All rights reserved 7
---------------------- Page: 13 ----------------------
ISO 17515-2:2020(E)
7 ITS station
7.1 ITS station and communication architecture

The ITS station architecture specified in ISO 21217 is presented in Figure 9. The ITS-LTE-D2D CI is

allocated in the ITS-S access layer of the ITS station architecture.
Figure 9 — ITS station architecture

Figure 10 shows the architecture diagram of an ITS-LTE-D2D CI communications interface (CI)

embedded in the general ITS station architecture.
8 © ISO 2020 – All rights reserved
---------------------- Page: 14 ----------------------
ISO 17515-2:2020(E)
Figure 10 — LTE-D2D CI architecture
The communication protocol layers of the ITS-LTE-D2D CI specified by 3GPP are:
a) Physical layer (PHY);
b) Data link layer (DLL).
An ITS-LTE-D2D CI as specified in this document is an ITS wireless CI:
— of MedType c-ITSatt-iso17515 as specified in ISO 17419;

— of CI class CIC-l6 as specified in ISO 21218 for one-to-many communications either with support of

a base station of a cellular network or without support of the base station;

— of CI access class CIAC-4, or CIAC-3, or CIAC-2 as specified in ISO 21218, dependent on the commercial

agreements with an operator of the cellular network.

An ITS-LTE-D2D CI provides the functionality of the IN-SAP specified in ISO 21218, and uses the

functionality of a MI-SAP, and a SI-SAP specified in ISO 24102-3.
7.2 Service access points
7.2.1 General

Requirements set up in this document to support SAPs and the related service primitives thus mean

to support the functionality. This support may be implemented either in a strict meaning, i.e. using the

ASN.1 definitions of the service primitives as "PDU" definitions, or in an abstract meaning, i.e. allowing

for proprietary solutions.

NOTE As Service Access Points (SAPs) per definition describe functional behaviour only, SAPs can be

implemented in different ways.
© ISO 2020 – All rights reserved 9
---------------------- Page: 15 ----------------------
ISO 17515-2:2020(E)
7.2.2 Communications service access points

An ITS-LTE-D2D CI shall support the IN-SAP functionality as specified in ISO 21218.

7.2.3 Management service access points

An ITS-LTE-D2D CI shall support the MI-SAP functionality of ISO 24102-3 with details as specified in

ISO 21218.
7.2.4 Security service access points

An ITS-LTE-D2D CI shall support the SI-SAP functionality of ISO 24102-3 with details as specified in

ISO 21218.
8 Communication interface (CI) protocol stack
8.1 Physical layer

The basic behaviour of the LTE-D2D CI physical layer shall be as specified in the respective LTE

standards from 3GPP, see Clause 6.
8.2 Data link layer
8.2.1 Basic behaviour

The basic behaviour of the LTE-D2D CI data link layer shall be as specified in the respective LTE

standards from 3GPP, see Clause 6.
8.2.2 Data link layer communication addresses
LTE-D2D SideLink commu
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.