1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T F.749.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2015) SERIES F: NON-TELEPHONE TELECOMMUNICATION SERVICES Multimedia services Functional requirements for vehicle gateways Recommendation ITU-T F.749.1 ITU-T F-SERI
2、ES RECOMMENDATIONS NON-TELEPHONE TELECOMMUNICATION SERVICES TELEGRAPH SERVICE Operating methods for the international public telegram service F.1F.19 The gentex network F.20F.29 Message switching F.30F.39 The international telemessage service F.40F.58 The international telex service F.59F.89 Statist
3、ics and publications on international telegraph services F.90F.99 Scheduled and leased communication services F.100F.104 Phototelegraph service F.105F.109 MOBILE SERVICE Mobile services and multidestination satellite services F.110F.159 TELEMATIC SERVICES Public facsimile service F.160F.199 Teletex
4、service F.200F.299 Videotex service F.300F.349 General provisions for telematic services F.350F.399 MESSAGE HANDLING SERVICES F.400F.499 DIRECTORY SERVICES F.500F.549 DOCUMENT COMMUNICATION Document communication F.550F.579 Programming communication interfaces F.580F.599 DATA TRANSMISSION SERVICES F
5、.600F.699 MULTIMEDIA SERVICES F.700F.799 ISDN SERVICES F.800F.849 UNIVERSAL PERSONAL TELECOMMUNICATION F.850F.899 HUMAN FACTORS F.900F.999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T F.749.1 (11/2015) i Recommendation ITU-T F.749.1 Functional requirements for v
6、ehicle gateways Summary A vehicle gateway (VG) is a device in a vehicle that enables communications between a device in the vehicle and another device which may be physically located either inside the vehicle or outside the vehicle. Recommendation ITU-T F.749.1 describes functional requirements for
7、vehicle gateways, including transport functional requirements, networking functional requirements, network access functional requirements, communication with in-vehicle devices functional requirements and network access management and security functional requirements. This Recommendation also descri
8、bes the network protocols and communications interfaces to support seamless wired and wireless connectivity in heterogeneous access network environments. This Recommendation specifies functional requirements for a VG supporting a variety of existing and new access technologies. The VG is to a large
9、extent independent from specific communication technologies and specific intelligent transport system (ITS) applications. The VG architecture is intended to be an open architecture, which will make it easy for a manufacturer to implement, test and select an appropriate communications type according
10、to the manufacturers own requirements and network conditions. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T F.749.1 2015-11-29 16 11.1002/1000/12631 Keywords Functional requirements, gateway architecture, interfaces, vehicle gateway. * To access the Recommendation, type th
11、e URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T F.749.1 (11/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency
12、in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to
13、standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations
14、is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness t
15、o indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is
16、achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLEC
17、TUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whethe
18、r asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are caut
19、ioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of
20、ITU. Rec. ITU-T F.749.1 (11/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 3 6 Overview of VG and VGP 3 7 Functional requirements for a VG 4 7.1 Tran
21、sport-related functional requirements . 4 7.2 Networking-related functional requirements 4 7.3 Network access-related functional requirements 5 7.4 Functional requirements for communications with in-vehicle devices 7 7.5 Functional requirements for management and security 7 Bibliography. 9 Rec. ITU-
22、T F.749.1 (11/2015) 1 Recommendation ITU-T F.749.1 Functional requirements for vehicle gateways 1 Scope This Recommendation specifies functional requirements for vehicle gateways (VGs), including transport functional requirements, networking functional requirements, network access functional require
23、ments, communication-with-in-vehicle devices functional requirements, and network access management and security functional requirements. It also describes communications interfaces to support the seamless wired and wireless connectivity in the heterogeneous access network environments. 2 References
24、 The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of
25、this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation
26、 does not give it, as a stand-alone document, the status of a Recommendation. IEEE 802.11 IEEE 802.11 (2012), IEEE Standard for Information technology-Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements Part 11: Wireless LAN Medium A
27、ccess Control (MAC) and Physical Layer (PHY) Specifications. standards.ieee.org/about/get/802/802.11.html 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 functional entity b-ITU-T Y.2012: An entity that comprises an indivisible set of s
28、pecific functions. Functional entities are logical concepts, while groupings of functional entities are used to describe practical, physical implementations. 3.1.2 intelligent transport systems (ITS) b-ITU-T Y.2281: ITS is defined as systems utilizing the combination of computers, communications, po
29、sitioning and automation technologies to improve the safety, management and efficiency of terrestrial transport systems. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 nomadic devices: Nomadic devices include all types of information and communication
30、 devices as well as entertainment devices that can be brought into the vehicle by the driver and/or passengers to be used while driving. Examples include mobile phones, portable computers, tablets, mobile navigation devices, portable media players and multi-functional smart phones. 3.2.2 vehicle gat
31、eway (VG): A VG is a device in a vehicle that enables communications between a device in the vehicle and another device which may be physically located either inside the vehicle or outside the vehicle (e.g., roadside station, cloud-based server, etc.). A VG provides standardized interfaces and proto
32、cols, communications across heterogeneous networks, optimized network 2 Rec. ITU-T F.749.1 (11/2015) selection based on application needs and network QoS, arbitration and integration of network communications, security and switching network connections to maintain service continuity. 3.2.3 vehicle g
33、ateway platform (VGP): A VGP is the collection of ICT hardware and software in a vehicle operating as an open platform to provide an integrated runtime environment for delivering the communications services of a VG. A VGP may also provide higher layer communications services such as interaction with
34、 the driver through the driver-vehicle access services and so on. Subsystems dedicated solely to vehicle operation are not considered part of the VGP. Supported applications/services include ITS and infotainment. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and a
35、cronyms: 2G Second Generation of cellular phone technologies 3G Third Generation of cellular phone technologies 4G Fourth Generation of cellular phone technologies CAN Controller Area Network CI Communication Interface D2D Device-to-Device DSRC Dedicated Short Range Communication EAP Extensible Auth
36、entication Protocol ECU Electronic Control Unit FM-RDS Frequency Modulation Radio Data System GNSS Global Navigation Satellite System ICT Information and Communication Technology IPv4 Internet Protocol version 4 IPv6 Internet Protocol version 6 IR Infrared ITS Intelligent Transport System NAT Networ
37、k Address Translation OSI Open Systems Interconnection RSU Road Side Unit SIM Subscriber Identity Module SPI Stateful Packet Inspection TCP Transport Control Protocol UDP User Datagram Protocol VG Vehicle Gateway VGP Vehicle Gateway Platform V2I Vehicle-to-Infrastructure V2V Vehicle-to-Vehicle WEP W
38、ired Equivalent Privacy Rec. ITU-T F.749.1 (11/2015) 3 WLAN Wireless Local Area Network WPAN Wireless Personal Area Network 5 Conventions None. 6 Overview of VG and VGP A vehicle gateway platform (VGP) is a collection of information and communication technology (ICT) hardware and software in a vehic
39、le operating as an open platform to provide an integrated runtime environment for delivering the communications services of a vehicle gateway (VG). The VGP may also provide higher layer communications services such as interaction with the driver through the driver-vehicle access services and so on.
40、Subsystems dedicated solely to vehicle operation are not considered part of the VGP. Supported applications/services include intelligent transport system (ITS) and infotainment. The VGP functional layer structure model follows the principles of the open systems interconnection (OSI) model for layere
41、d communication protocols. Based on the VGP framework, the VGP functionality straddles across OSI layers 1 to 7, whereas the VG functionality covers OSI layers 1 to 4. The VG includes transport functions, networking functions and network access functions. The coloured block in Figure 1 shows the loc
42、ation of a VG within the VGP. Figure 1 Scope of VG within the VGP Figure 2 shows the functional layers of a VG. Figure 2 Functional layers of a VG 4 Rec. ITU-T F.749.1 (11/2015) The network access functional layer can be divided into three interface groups between a VG and internal or external devic
43、es/networks as follows: Interfaces for nomadic devices, which are used for communication between the VG and consumer devices. Interfaces for external devices using networks such as cellular communications, short-to-medium range wireless communication such as legacy dedicated short range communicatio
44、n (DSRC), IEEE 802.11 (part of wireless access in vehicular environments), etc. which are used to provide communications for ITS services. Interfaces for accessing in-vehicle devices such as sensors and electronic control units (ECUs) through the in-vehicle buses like the controller area network (CA
45、N) bus. The upper layers handle transport functions and networking layers handle routing functions, reliable data delivery of service data, etc. 7 Functional requirements for a VG Figure 3 shows the functional blocks for a VG. VG functional blocks include transport functional blocks, networking func
46、tional blocks, network access functional blocks, wired and wireless access management functional blocks and security functional blocks. Figure 3 VG functional blocks 7.1 Transport-related functional requirements The VG should support several transport protocols including UDP/TCP. The VG should also
47、support the network address translation (NAT) function to provide Internet access to all in-vehicle devices. 7.2 Networking-related functional requirements The VG should support multiple optional and complementary network protocols running independent of each other: VG shall support IP protocols, e.
48、g., IPv4 or IPv6 for Internet connectivity including the routing capability to the selected network. Rec. ITU-T F.749.1 (11/2015) 5 VG should support other network protocols. These protocols are meant to support applications with severe timing constraints and low latency requirements, e.g., time-cri
49、tical safety related applications, road safety and traffic efficiency applications. 7.3 Network access-related functional requirements In this Recommendation, network access covers the OSI model physical layer (PHY) (connecting physically to the communication medium) and data link layer (DLL), which may be sub-divided into medium access control (MAC) sub-layer managing the access to the communication medium, and logical link control (LLC) sub-layer. Communication interface (CI) is an implementation of a network access technol
