1、PD ISO/TS 16460:2016 Intelligent transport systems Communications access for land mobiles (CALM) Communication protocol messages for global usage BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06PD ISO/TS 16460:2016 PUBLISHED DOCUMENT National foreword This Published
2、 Document is the UK implementation of ISO/TS 16460:2016. The UK participation in its preparation was entrusted to Technical Committee EPL/278, Intelligent transport systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not p
3、urport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 94465 9 ICS 03.220.01; 35.240.60 Compliance with a British Standard cannot confer immunity f
4、rom legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 August 2016. Amendments issued since publication Date Text affectedPD ISO/TS 16460:2016 ISO 2016 Intelligent transport systems Communications access for land mobiles
5、(CALM) Communication protocol messages for global usage Systmes intelligents de transport Accs aux communications des services mobiles terrestres (CALM) Messages de protocole de communication pour une utilisation globale TECHNICAL SPECIFICATION ISO/TS 16460 Reference number ISO/TS 16460:2016(E) Firs
6、t edition 2016-09-01PD ISO/TS 16460:2016ISO/TS 16460:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means
7、, 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 ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-12
8、14 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgPD ISO/TS 16460:2016ISO/TS 16460:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Abbreviated terms 2 5 Localized communications messages . 2 5.
9、1 Purpose 2 5.2 Localized message protocol . 3 5.3 Message formats 3 5.4 Networking features. 4 5.4.1 Subtype values . 4 5.4.2 Networking feature 0 . 5 5.4.3 Networking feature 1 . 5 5.4.4 Networking feature 2 . 6 5.4.5 N-Extensions . 7 5.4.6 TPID values . 7 5.5 Transport features . 8 5.5.1 Transpor
10、t feature 0 8 5.5.2 Transport feature 1 9 5.5.3 Transport feature 2 .10 5.5.4 T-Extensions11 5.5.5 ITS port numbers .11 5.6 Procedures .11 6 Service advertisement messages 11 6.1 Purpose .11 6.2 Unique identifiers 12 6.2.1 ITS-AID/PSID .12 6.2.2 ITS-PN 12 6.3 Service advertisement protocol 13 6.4 Se
11、rvice advertisement message 13 6.4.1 Messages 13 6.4.2 Message structure 13 6.4.3 Message header .14 6.4.4 Message body .16 6.5 Service response message 21 6.5.1 Message structure 21 6.5.2 Message header .22 6.5.3 Message body .22 6.6 Count N .26 6.7 Procedures .26 6.7.1 General.26 6.7.2 Privately a
12、llocated channels .26 6.8 Secured messages 27 7 Structure of extension elements .28 Annex A (normative) ASN.1 modules 30 Bibliography .43 ISO 2016 All rights reserved iii Contents PagePD ISO/TS 16460:2016ISO/TS 16460:2016(E) Foreword ISO (the International Organization for Standardization) is a worl
13、dwide 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
14、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 d
15、ocument 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 Direc
16、tives, 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 develo
17、pment 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 on the meaning of ISO
18、specific terms and expressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html. The committee responsible for this document is
19、 ISO/TC 204, Intelligent transport systems.iv ISO 2016 All rights reservedPD ISO/TS 16460:2016ISO/TS 16460:2016(E) Introduction This document is a member of the set of International Standards for communications access for land mobiles (CALM). An introduction to this set of International Standards is
20、 provided in ISO 21217. 2 Localized communications, i.e. communications without networking through a cloud, and service advertisement are essential protocol functionalities in Cooperative Intelligent Transport Systems (C-ITS). ISO and IEEE developed protocols with similar functionality, i.e. the ISO
21、 Fast Networking the Service Advertisement Message (SAM): an APDU to be transported in for example, an LM; the Service Response Message (SRM): an APDU acknowledging a SAM that offered a service based on an ITS application class 8to be transported in for example, an LM; the related basic requirements
22、 for procedures. Specifications are partly done by normative references to IEEE 1609.3 TM -2016. NOTE These message format specifications and basic procedures need to be complemented by complete procedures and SAP specifications according to the context of usage, i.e. an ITS station specified in ISO
23、 21217, 2or a WAVE device specified in IEEE 1609.0 TM11or any other context. 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
24、 undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 8824-1, Information technology Abstract Syntax Notation One (ASN.1): Specification of basic notation ISO/IEC 8825-2, Information technology ASN.1 encoding rules: Specification of Packed Enc
25、oding Rules (PER) IEEE 1609.3 TM -2016, Standard for Wireless Access in Vehicular Environments (WAVE) Networking Services 3 T erms a nd definiti ons No terms and definitions are defined in this document. ISO and IEC maintain terminological databases for use in standardization at the following addres
26、ses: IEC Electropedia: available at http:/ /www.electropedia.org/ ISO Online browsing platform: available at http:/ /www.iso.org/obp TECHNICAL SPECIFICATION ISO/TS 16460:2016(E) ISO 2016 All rights reserved 1PD ISO/TS 16460:2016ISO/TS 16460:2016(E) 4 Abbreviated terms CIP communication interface par
27、ameter C-ITS cooperative ITS FNTP fast networking 2 ISO 2016 All rights reservedPD ISO/TS 16460:2016ISO/TS 16460:2016(E) dedicated forwarding performed at higher layers, e.g. at the ITS-S facilities layer of an ITS station 2 ; this is a feature useful for geo-dissemination of information; which crea
28、tes so-called “Vehicular Ad hoc NETworks” (VANETs). Routing of packets through a network in ITS will use the Internet protocol version 6 (IPv6). 5.2 Localized message protocol As this document does not specify a specific localized communications protocol but just the structure of messages of such pr
29、otocols and related basic requirements, a hypothetical localized communications protocol with the name “Localized Message Protocol” is used to simplify reading of the document. 5.3 Message formats Figure 1 illustrates the basic format of the Localized Message (LM). Unaligned packet encoding rules (U
30、PER) applied to the ASN.1 type LMnpdu defined in A.2.1 results in the intended binary presentation of this LM format. Figure 1 General format of the LM NPDU NOTE 1 In Figure 1, the “TPID” field (specified in IEEE 1609.3 TM -2016 as a one-octet unsigned integer field completely allocated in the WSMP-
31、N-Header) is split into a “Feature selector” field of the “N-Header” and a “T-Extensions flag” field of the “T-Header” (according to the general rules of the OSI model). However, the two presentations result in identical binary presentations. The LM consists of three parts: “N-Header” a 4-bit unsign
32、ed integer “Subtype” number in the range of 0 to 15 indicating a networking related feature; a 1-bit “N-Extensions flag”; a 3-bit unsigned integer “Version” number in the range of 0 to 7 indicating the version of the localized message protocol. In case a receiver does not support the version, the re
33、ceived packet cannot be processed. The first version number used is three as specified in IEEE 1609.3 TM -2016; NOTE 2 The format presented in Figure 1 is such that WAVE devices implementing version 2 of WSMP 13can identify LMs as WSMP messages with version number 3 or higher. a networking related f
34、eature specified in 5.4 and selected by the value contained in the field “Subtype”; “N-Extensions” being present if the “N-Extensions flag” is set to 1b; a 7-bit unsigned integer in the range of 0 to 127, the “Transport Protocol Identifier (TPID) feature selector”, indicating content in the “T-Heade
35、r”. “T-Header” a 1-bit “TPID - T-Extensions flag”; ISO 2016 All rights reserved 3PD ISO/TS 16460:2016ISO/TS 16460:2016(E) a transport related feature specified in 5.5 and selected by the TPID feature selector value contained in the “N-Header”; “T-Extensions” being present if the “T-Extension flag” i
36、s set to 1b; a one or two octet field indicating the number of octets contained in “User data”. Body the “User data”. The distinction of “N-Header” (networking related features) and “T-Header” (transport related features) is in support of the ITS-S networking and transport layer that combines OSI la
37、yers 3 and 4 as illustrated in ISO 21217. 2 The field “Length of User data” has a length of one or two octets dependent on the value contained in it: one octet size: Values from 0 to 127. The most significant bit is always set to zero. Presented as 0x00 (=0) to 0xEF (=127); i.e. the remaining 7 bits
38、 contain an unsigned integer number. two octet size: Values from 128 to 16383. The most significant bit of the first octet is always set to one and the second most significant bit of the first octet is always set to zero. Presented as 0x8080 (=128) to 0xBFFF (=16383); i.e. the remaining 14 bits cont
39、ain an unsigned integer number. NOTE 3 This presentation results from the unaligned packed encoding rules applied to ASN.1 types of unconstraint variable length. 5.4 Networking features 5.4.1 Subtype values Networking features are identified by a subtype value. Subtype values are presented in Table
40、1. Table 1 Subtype values Subtype N-Extensions f lag N-Extensions Networking related features Remark 0 0b Not present Null-Networking Mandatory feature specified in IEEE 1609.3 TM -2016. Format described in 5.4.2. 1b Present 1 0b Not present ITS station-internal forwarding Format specified in 5.4.3.
41、 1b Present 2 0b Not present N-hop forwarding Format specified in 5.4.4. 1b Present 3 0b Not present Geo-forwarding Reserved. Not specified in this document. 1b Present 47 0b Not present Reserved for ISO Allows for further four networking features. 1b Present 815 0b Not present Reserved for IEEE All
42、ows for further eight networking features. 1b Present N-Extensions and related basic procedures shall be as specified in 5.4.5. New networking features can be specified and linked to so far reserved subtype values at a later stage without breaking backward compatibility. NOTE Updates of N-Extensions
43、 will be published in the ISO/TS 16460 folder of the ISO standards maintenance portal at http:/ /standards.iso.org/iso/ts/16460.4 ISO 2016 All rights reservedPD ISO/TS 16460:2016ISO/TS 16460:2016(E) 5.4.2 Networking feature 0 Subtype 0 selects the “Null-Networking” feature introduced in 5.4.1. NOTE
44、Procedures on how to use this feature in the context of an ITS station unit, or a WAVE device or any other context are outside the scope of this document. The “Null-Networking” feature with Subtype 0 is the uppermost simple feature, as it requires only processing of the TPID feature selector field s
45、pecified in 5.6. Figure 2 presents the N-Header format for Subtype 0 with N-Extensions being absent. Figure 2 N-Header for Subtype 0 without N-Extensions Figure 3 presents the N-Header format for Subtype 0 with N-Extensions being present. Figure 3 N-Header for Subtype 0 with N-Extensions N-Extension
46、s and related basic procedures shall be as specified in 5.4.5. 5.4.3 Networking feature 1 Subtype 1 selects the “ITS Station-Internal Forwarding” feature introduced in 5.4.1. NOTE Procedures on how to use this feature in the context of an ITS station unit, or a WAVE device, or any other context are
47、outside the scope of this document. ITS station-internal forwarding is a feature applicable in ITS stations compliant with ISO 21218 3(Link- ID) and ISO 24102-1 4(ITS-SCU-ID). It is used to forward packets between router units and host units that are part of the same station/device. The field “Direc
48、tion” contains an unsigned integer number with the two possible values “0” (“from host to router”) and “255” (“from router to host”). The field “Counter” contains a one octet unsigned integer cyclic packet counter being unique in the unit that forwards a packet. Figure 4 presents the N-Header format for Subtype 1 with N-Extensions being absent. Figure 4 N-Header for Subtype 1 without N-Extensions Figure 5 presents the N-Header format for Subtype 1 with N-Extensions being present. ISO 2016 All rights reserved 5
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