ETSI EN 302 636-5-1 V1.2.1 (2014-08)
Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol
Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol
REN/ITS-0030036
Inteligentni transportni sistemi (ITS) - Komunikacije med vozili - Geomreženje - 5. del: Transportni protokoli - 1. poddel: Osnovni transportni protokol
Ta dokument določa osnovni transportni protokol (BTP) za transport paketov med postajami inteligentnih transportnih sistemov (ITS). Nahaja se na vrhu protokola geomreženja, opredeljenega v ETSI EN 302 636-4-1 [5] in ETSI TS 102 636-4-2 [i.2], ter pod plastjo opreme ITS-S. Zagotavlja nezanesljivo transportno storitev brez povezave, ki poteka od enega konca do drugega.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Inteligentni transportni sistemi (ITS) - Komunikacije med vozili - Geomreženje - 5. del: Transportni protokoli - 1. poddel: Osnovni transportni protokolIntelligent Transport Systems (ITS) - Vehicular Communications - GeoNetworking - Part 5: Transport Protocols - Sub-part 1: Basic Transport Protocol35.240.60Uporabniške rešitve IT v transportu in trgoviniIT applications in transport and tradeICS:Ta slovenski standard je istoveten z:EN 302 636-5-1 Version 1.2.1SIST EN 302 636-5-1 V1.2.1:2014en01-oktober-2014SIST EN 302 636-5-1 V1.2.1:2014SLOVENSKI
STANDARD
SIST EN 302 636-5-1 V1.2.1:2014
ETSI EN 302 636-5-1 V1.2.1 (2014-08) Intelligent Transport Systems (ITS);
Vehicular Communications; GeoNetworking; Part 5: Transport Protocols;
Sub-part 1: Basic Transport Protocol
EUROPEAN STANDARD SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)2
Reference REN/ITS-0030036 Keywords addressing, autonomic networking, ITS, network, protocol ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice The present document can be downloaded from: http://www.etsi.org The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2014. All rights reserved.
DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association. SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)3 Contents Intellectual Property Rights . 4 Foreword . 4 Modal verbs terminology . 4 Introduction . 4 1 Scope . 6 2 References . 6 2.1 Normative references . 6 2.2 Informative references . 6 3 Definitions and abbreviations . 7 3.1 Definitions . 7 3.2 Abbreviations . 7 4 Services provided by the Basic Transport Protocol . 8 5 Format convention . 8 6 BTP packet structure . 9 7 BTP header . 9 7.1 Overview . 9 7.2 BTP-A header . 10 7.2.1 Structure of the BTP-A header . 10 7.2.2 Fields of the BTP-A header . 10 7.3 BTP-B header . 10 7.3.1 Structure of the BTP-B header . 10 7.3.2 Fields of the BTP-B header . 11 8 Protocol operations . 11 8.1 General . 11 8.2 Source operations . 11 8.3 Destination operations . 12 Annex A (informative): BTP data services . 13 A.1 General . 13 A.2 BTP-Data.request . 13 A.3 BTP-Data.indication . 14 Annex B (normative): Well-known BTP port numbers . 16 Annex C (informative): Bibliography . 17 History . 18
SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is 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 (http://ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, 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. Foreword This European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS). The present document is part 5, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in ETSI EN 302 636-1 [2].
National transposition dates Date of adoption of this EN: 14 July 2014 Date of latest announcement of this EN (doa): 31 October 2014 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
30 April 2015 Date of withdrawal of any conflicting National Standard (dow): 30 April 2016
Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "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. Introduction The Basic Transport Protocol (BTP) provides an end-to-end, connection-less transport service in the ITS ad hoc network. Its main purpose is the multiplexing of messages from different processes at the ITS facilities layer, e.g. CAM and DENM from the cooperative awareness basic service and the distributed environmental notification basic service, for the transmission of packets via the GeoNetworking protocol as well as the de-multiplexing at the destination. BTP enables protocol entities at the ITS facilities layer to access services of the GeoNetworking protocol and to pass protocol control information between the ITS facilities layer and the GeoNetworking protocol. SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)5 Message multiplexing/demultiplexing is based on ports, an ITS station-internal 16 bit address. A port represents a communication endpoint that identifies the ITS station protocol entity at the source (source port) or the destination (destination port). The usage of ports is similar to the two-stage packet transport in the IP protocol suite, where the IP provides the routing of packets from source to destination and the transport protocol, such as UDP, multiplexes/demultiplexes messages from/to application processes. In the case of BTP, the GeoNetworking protocol transports the packets among the ITS stations and the BTP protocol delivers the packets to the entities at the ITS facilities layer. BTP also adopts the concept of "well-known ports" from the IP protocol suite that assigns fixed ports to specific ITS facilities layer protocols. The definition of the ports, however, is beyond the scope of the present document. BTP is a lightweight protocol: It has a 4-byte protocol header and requires minimal processing. It provides an unreliable transport of packets, i.e. packets can arrive out-of-order, appear duplicated or can be lost. The design of BTP assumes that entities using the protocol are either tolerant against the unreliable packet transport or provide appropriate mechanisms for reliable communication in their protocols. SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)6 1 Scope The present document specifies the Basic Transport Protocol (BTP) for the transport of packets among ITS stations. It resides on top of the GeoNetworking protocol specified in ETSI EN 302 636-4-1 [5] and ETSI TS 102 636-4-2 [i.2] and below the ITS-S facilities layer. It provides an end-to-end, connection-less and unreliable transport service. 2 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 reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://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. 2.1 Normative references The following referenced documents are necessary for the application of the present document. [1] ETSI EN 302 665: "Intelligent Transport Systems (ITS); Communications Architecture". [2] ETSI EN 302 636-1: "Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 1: Requirements". [3] ETSI EN 302 636-2: "Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 2: Scenarios". [4] ETSI TS 102 636-3: "Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 3: Network architecture". [5] ETSI EN 302 636-4-1: "Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; Sub-part 1: Media-Independent Functionality". 2.2 Informative references 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 302 663: "Intelligent Transport Systems (ITS); Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band". [i.2] ETSI TS 102 636-4-2: "Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 2: Media-dependent functionalities for ITS-G5". [i.3] ETSI EN 302 637-2: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of Applications; Part 2: Specification of Cooperative Awareness Basic Service". [i.4] ETSI EN 302 637-3: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of Applications; Part 3: Specifications of Decentralized Environmental Notification Basic Service". [i.5] ETSI TS 102 890-2: "Intelligent Transport Systems (ITS); Facilities layer function;
Part 2: Services announcement specification". SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)7 [i.6] IETF RFC 768: "User Datagram Protocol". [i.7] ISO/IEC 8802-2: "Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements; Part 2: Logical Link Control". [i.8] ISO EN 17419: "Intelligent Transport Systems - Cooperative Systems - Classification and management of ITS applications in a global context". [i.9] ISO TS 19091: "Intelligent transport systems - Cooperative Systems - SPAT (Signal Phase and Timing) message, MAP (Intersection topology) message harmonization and profile to SAE J2735". 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in ETSI EN 302 665 [1], ETSI TS 102 636-3 [4] and the following apply: BTP-PDU: protocol Protocol Data Unit exchanged between BTP peer entities destination: receiving BTP entity in the ITS station destination port: port at which the destination is expected to listen for a BTP packet GN-PDU: protocol Data Unit exchanged between peer entities of the GeoNetworking protocol ITS-FPCI: protocol Control Information passed from the ITS Facilities layer to the BTP port: ITS station-internal address that identifies a protocol entity at the ITS facilities layer and represents an endpoint of a logical connection source: originating BTP entity in the ITS station
source port: port identifying the originating protocol entity at the ITS facilities layer NOTE: Such an entity may be listening for a reply BTP packet. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in ETSI EN 302 665 [1], ETSI TS 102 636-3 [4] and the following apply: BTP Basic Transport Protocol BTP-PDU Basic Transport Protocol Protocol Data Unit BTP-SAP Basic Transport Protocol Service Access Point GN-PDU GeoNetworking protocol PDU exchanged between peer entities of the GeoNetworking protocol GN-SAP GeoNetworking Service Access Point ITS-FPCI ITS Facility layer Protocol Control Information ITS-FPDU ITS Facilities layer Protocol Data Unit ITS-FSDU ITS Facilities layer Service Data Unit
LLC Logical Link Control PCI Protocol Control Information SIST EN 302 636-5-1 V1.2.1:2014
ETSI ETSI EN 302 636-5-1 V1.2.1 (2014-08)8 4 Services provided by the Basic Transport Protocol The Basic Transport Protocol (BTP) provides an end-to-end, connection-less transport service in the ITS ad ho
...
ETSI EN 302 636-5-1 V1.2.1 (2014-08)
EUROPEAN STANDARD
Intelligent Transport Systems (ITS);
Vehicular Communications;
GeoNetworking;
Part 5: Transport Protocols;
Sub-part 1: Basic Transport Protocol
---------------------- Page: 1 ----------------------
2 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
Reference
REN/ITS-0030036
Keywords
addressing, autonomic networking, ITS, network,
protocol
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2014.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 4
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 Services provided by the Basic Transport Protocol . 8
5 Format convention . 8
6 BTP packet structure . 9
7 BTP header . 9
7.1 Overview . 9
7.2 BTP-A header . 10
7.2.1 Structure of the BTP-A header . 10
7.2.2 Fields of the BTP-A header . 10
7.3 BTP-B header . 10
7.3.1 Structure of the BTP-B header . 10
7.3.2 Fields of the BTP-B header . 11
8 Protocol operations . 11
8.1 General . 11
8.2 Source operations . 11
8.3 Destination operations . 12
Annex A (informative): BTP data services . 13
A.1 General . 13
A.2 BTP-Data.request . 13
A.3 BTP-Data.indication . 14
Annex B (normative): Well-known BTP port numbers . 16
Annex C (informative): Bibliography . 17
History . 18
ETSI
---------------------- Page: 3 ----------------------
4 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is 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 (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, 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.
Foreword
This European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS).
The present document is part 5, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in
ETSI EN 302 636-1 [2].
National transposition dates
Date of adoption of this EN: 14 July 2014
Date of latest announcement of this EN (doa): 31 October 2014
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 April 2015
Date of withdrawal of any conflicting National Standard (dow): 30 April 2016
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "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.
Introduction
The Basic Transport Protocol (BTP) provides an end-to-end, connection-less transport service in the ITS ad hoc
network. Its main purpose is the multiplexing of messages from different processes at the ITS facilities layer, e.g. CAM
and DENM from the cooperative awareness basic service and the distributed environmental notification basic service,
for the transmission of packets via the GeoNetworking protocol as well as the de-multiplexing at the destination. BTP
enables protocol entities at the ITS facilities layer to access services of the GeoNetworking protocol and to pass
protocol control information between the ITS facilities layer and the GeoNetworking protocol.
ETSI
---------------------- Page: 4 ----------------------
5 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
Message multiplexing/demultiplexing is based on ports, an ITS station-internal 16 bit address. A port represents a
communication endpoint that identifies the ITS station protocol entity at the source (source port) or the destination
(destination port). The usage of ports is similar to the two-stage packet transport in the IP protocol suite, where the IP
provides the routing of packets from source to destination and the transport protocol, such as UDP,
multiplexes/demultiplexes messages from/to application processes. In the case of BTP, the GeoNetworking protocol
transports the packets among the ITS stations and the BTP protocol delivers the packets to the entities at the ITS
facilities layer. BTP also adopts the concept of "well-known ports" from the IP protocol suite that assigns fixed ports to
specific ITS facilities layer protocols. The definition of the ports, however, is beyond the scope of the present
document.
BTP is a lightweight protocol: It has a 4-byte protocol header and requires minimal processing. It provides an unreliable
transport of packets, i.e. packets can arrive out-of-order, appear duplicated or can be lost. The design of BTP assumes
that entities using the protocol are either tolerant against the unreliable packet transport or provide appropriate
mechanisms for reliable communication in their protocols.
ETSI
---------------------- Page: 5 ----------------------
6 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
1 Scope
The present document specifies the Basic Transport Protocol (BTP) for the transport of packets among ITS stations. It
resides on top of the GeoNetworking protocol specified in ETSI EN 302 636-4-1 [5] and ETSI TS 102 636-4-2 [i.2] and
below the ITS-S facilities layer. It provides an end-to-end, connection-less and unreliable transport service.
2 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
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://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.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 302 665: "Intelligent Transport Systems (ITS); Communications Architecture".
[2] ETSI EN 302 636-1: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 1: Requirements".
[3] ETSI EN 302 636-2: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 2: Scenarios".
[4] ETSI TS 102 636-3: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 3: Network architecture".
[5] ETSI EN 302 636-4-1: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 1: Media-Independent Functionality".
2.2 Informative references
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 302 663: "Intelligent Transport Systems (ITS); Access layer specification for Intelligent
Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI TS 102 636-4-2: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 2: Media-dependent functionalities for ITS-G5".
[i.3] ETSI EN 302 637-2: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set
of Applications; Part 2: Specification of Cooperative Awareness Basic Service".
[i.4] ETSI EN 302 637-3: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set
of Applications; Part 3: Specifications of Decentralized Environmental Notification Basic
Service".
[i.5] ETSI TS 102 890-2: "Intelligent Transport Systems (ITS); Facilities layer function;
Part 2: Services announcement specification".
ETSI
---------------------- Page: 6 ----------------------
7 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
[i.6] IETF RFC 768: "User Datagram Protocol".
[i.7] ISO/IEC 8802-2: "Information technology - Telecommunications and information exchange
between systems - Local and metropolitan area networks - Specific requirements; Part 2: Logical
Link Control".
[i.8] ISO EN 17419: "Intelligent Transport Systems - Cooperative Systems - Classification and
management of ITS applications in a global context".
[i.9] ISO TS 19091: "Intelligent transport systems - Cooperative Systems - SPAT (Signal Phase and
Timing) message, MAP (Intersection topology) message harmonization and profile to SAE
J2735".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in ETSI EN 302 665 [1], ETSI
TS 102 636-3 [4] and the following apply:
BTP-PDU: protocol Protocol Data Unit exchanged between BTP peer entities
destination: receiving BTP entity in the ITS station
destination port: port at which the destination is expected to listen for a BTP packet
GN-PDU: protocol Data Unit exchanged between peer entities of the GeoNetworking protocol
ITS-FPCI: protocol Control Information passed from the ITS Facilities layer to the BTP
port: ITS station-internal address that identifies a protocol entity at the ITS facilities layer and represents an endpoint of
a logical connection
source: originating BTP entity in the ITS station
source port: port identifying the originating protocol entity at the ITS facilities layer
NOTE: Such an entity may be listening for a reply BTP packet.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI EN 302 665 [1], ETSI TS 102 636-3 [4] and
the following apply:
BTP Basic Transport Protocol
BTP-PDU Basic Transport Protocol Protocol Data Unit
BTP-SAP Basic Transport Protocol Service Access Point
GN-PDU GeoNetworking protocol PDU exchanged between peer entities of the GeoNetworking protocol
GN-SAP GeoNetworking Service Access Point
ITS-FPCI ITS Facility layer Protocol Control Information
ITS-FPDU ITS Facilities layer Protocol Data Unit
ITS-FSDU ITS Facilities layer Service Data Unit
LLC Logical Link Control
PCI Protocol Control Information
ETSI
---------------------- Page: 7 ----------------------
8 ETSI EN 302 636-5-1 V1.2.1 (2014-08)
4 Services provided by the Basic Transport Protocol
The Basic Transport Protocol (BTP) provides an end-to-end, connection-less transport service in the ITS ad hoc
network (ETSI TS 102 636-3 [4]). Similar to UDP (RFC 768 [i.6]), it offers a minimal transport service, i.e. the
non-guaranteed delivery of BTP-PDUs among BTP entities. It also allows protocol entities at the ITS facilities layer to
directly access the services provided by the GeoNetworking protocol.
The BTP shall meet the requirements specified in ETSI EN 302 636-1 [2] and support the use cases defined in ETSI
EN 302 636-2 [3].
The BTP provides services to ITS facilities layer protocol en
...
Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
European Standard
Intelligent Transport Systems (ITS);
Vehicular Communications;
GeoNetworking;
Part 5: Transport Protocols;
Sub-part 1: Basic Transport Protocol
---------------------- Page: 1 ----------------------
2 Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
Reference
REN/ITS-0030036
Keywords
addressing, autonomic networking, ITS, network,
protocol
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2014.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3 Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
Contents
Intellectual Property Rights . 4
Foreword . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Services provided by the Basic Transport Protocol . 6
5 Format convention . 7
6 BTP packet structure . 8
7 BTP header . 8
7.1 Overview . 8
7.2 BTP-A header . 9
7.2.1 Structure of the BTP-A header . 9
7.2.2 Fields of the BTP-A header . 9
7.3 BTP-B header . 9
7.3.1 Structure of the BTP-B header . 9
7.3.2 Fields of the BTP-B header . 10
8 Protocol operations . 10
8.1 General . 10
8.2 Source operations . 10
8.3 Destination operations . 11
Annex A (informative): BTP data services . 12
A.1 General . 12
A.2 BTP-Data.request . 12
A.3 BTP-Data.indication . 13
Annex B (normative): Well-known BTP port numbers . 15
Annex C (informative): Bibliography . 16
History . 17
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4 Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is 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 (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, 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.
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 standards EN Approval Procedure.
The present document is part 5, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in
ETSI EN 302 636-1 [2].
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): 18 months after doa
Introduction
The Basic Transport Protocol (BTP) provides an end-to-end, connection-less transport service in the ITS ad hoc
network. Its main purpose is the multiplexing of messages from different processes at the ITS facilities layer, e.g. CAM
and DENM from the cooperative awareness basic service and the distributed environmental notification basic service,
for the transmission of packets via the GeoNetworking protocol as well as the de-multiplexing at the destination. BTP
enables protocol entities at the ITS facilities layer to access services of the GeoNetworking protocol and to pass
protocol control information between the ITS facilities layer and the GeoNetworking protocol.
Message multiplexing/demultiplexing is based on ports, an ITS station-internal 16 bit address. A port represents a
communication endpoint that identifies the ITS station protocol entity at the source (source port) or the destination
(destination port). The usage of ports is similar to the two-stage packet transport in the IP protocol suite, where the IP
provides the routing of packets from source to destination and the transport protocol, such as UDP,
multiplexes/demultiplexes messages from/to application processes. In the case of BTP, the GeoNetworking protocol
transports the packets among the ITS stations and the BTP protocol delivers the packets to the entities at the ITS
facilities layer. BTP also adopts the concept of "well-known ports" from the IP protocol suite that assigns fixed ports to
specific ITS facilities layer protocols. The definition of the ports, however, is beyond the scope of the present
document.
BTP is a lightweight protocol: It has a 4-byte protocol header and requires minimal processing. It provides an unreliable
transport of packets, i.e. packets can arrive out-of-order, appear duplicated or can be lost. The design of BTP assumes
that entities using the protocol are either tolerant against the unreliable packet transport or provide appropriate
mechanisms for reliable communication in their protocols.
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5 Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
1 Scope
The present document specifies the Basic Transport Protocol (BTP) for the transport of packets among ITS stations. It
resides on top of the GeoNetworking protocol specified in ETSI EN 302 636-4-1 [5] and ETSI TS 102 636-4-2 [i.2] and
below the ITS-S facilities layer. It provides an end-to-end, connection-less and unreliable transport service.
2 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
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://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.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 302 665: "Intelligent Transport Systems (ITS); Communications Architecture".
[2] ETSI EN 302 636-1: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 1: Requirements".
[3] ETSI EN 302 636-2: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 2: Scenarios".
[4] ETSI TS 102 636-3: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 3: Network architecture".
[5] ETSI EN 302 636-4-1: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 1: Media-Independent Functionality".
2.2 Informative references
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 302 663: "Intelligent Transport Systems (ITS); Access layer specification for Intelligent
Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI TS 102 636-4-2: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and
point-to-multipoint communications; Sub-part 2: Media-dependent functionalities for ITS-G5".
[i.3] ETSI EN 302 637-2: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set
of Applications; Part 2: Specification of Cooperative Awareness Basic Service".
[i.4] ETSI EN 302 637-3: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set
of Applications; Part 3: Specifications of Decentralized Environmental Notification Basic
Service".
[i.5] ETSI TS 102 890-2: "Intelligent Transport Systems (ITS); Facilities layer function;
Part 2: Services announcement specification".
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6 Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
[i.6] IETF RFC 768: "User Datagram Protocol".
[i.7] ISO/IEC 8802-2: "Information technology - Telecommunications and information exchange
between systems - Local and metropolitan area networks - Specific requirements; Part 2: Logical
Link Control".
[i.8] ISO EN 17419: "Intelligent Transport Systems - Cooperative Systems - Classification and
management of ITS applications in a global context".
[i.9] ISO TS 19091: "Intelligent transport systems - Cooperative Systems - SPAT (Signal Phase and
Timing) message, MAP (Intersection topology) message harmonization and profile to SAE
J2735".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in ETSI EN 302 665 [1], ETSI
TS 102 636-3 [4] and the following apply:
BTP-PDU: protocol Protocol Data Unit exchanged between BTP peer entities
destination: receiving BTP entity in the ITS station
destination port: port at which the destination is expected to listen for a BTP packet
GN-PDU: protocol Data Unit exchanged between peer entities of the GeoNetworking protocol
ITS-FPCI: protocol Control Information passed from the ITS Facilities layer to the BTP
port: ITS station-internal address that identifies a protocol entity at the ITS facilities layer and represents an endpoint of
a logical connection
source: originating BTP entity in the ITS station
source port: port identifying the originating protocol entity at the ITS facilities layer
NOTE: Such an entity may be listening for a reply BTP packet.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI EN 302 665 [1], ETSI TS 102 636-3 [4] and
the following apply:
BTP Basic Transport Protocol
BTP-PDU Basic Transport Protocol Protocol Data Unit
GN-PDU GeoNetworking protocol PDU exchanged between peer entities of the GeoNetworking protocol
ITS-FPCI ITS Facility layer Protocol Control Information
ITS-FPDU ITS Facilities layer Protocol Data Unit
ITS-FSDU ITS Facilities layer Service Data Unit
PCI Protocol Control Information
4 Services provided by the Basic Transport Protocol
The Basic Transport Protocol (BTP) provides an end-to-end, connection-less transport service in the ITS ad hoc
network (ETSI TS 102 636-3 [4]). Similar to UDP (RFC 768 [i.6]), it offers a minimal transport service, i.e. the non-
guaranteed delivery of BTP-PDUs among BTP entities. It also allows protocol entities at the ITS facilities layer to
directly access the services provided by the GeoNetworking protocol.
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7 Final draft ETSI EN 302 636-5-1 V1.2.1 (2014-05)
The BTP shall meet the requirements specified in ETSI EN 302 636-1 [2] and support the use cases defined in ETSI
EN 302 636-2 [3].
The BTP provides services to ITS facilities layer protocol entities (figure 1), such as cooperative awareness basic
service (ETSI EN 302 637-2 [i.3]) and DEN basic service (ETSI EN 302 637-3 [i.4]). The services are provided via the
BTP-SAP using service primitives of different types that carry parameters, i.e. Protocol Control Information
(ITS-FPCI), and the PDU of the upper protocol entity, i.e. ITS-F
...
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