1、DRAFT FOR DEVELOPMENT DD ENV 12315-1:1997 Traffic and Traveller Information (TTI) TTI Messages via Dedicated Short-Range Communication Part 1: Data Specification Downlink (Roadside to Vehicle) ICS 35.240.60DDENV12315-1:1997 This Draft for Development, having been prepared under thedirection of the E
2、lectrotechnical Sector Board, waspublished under the authorityof the Standards Boardand comes into effect on 15 April 1997 BSI 07-1999 The following BSI references relate to the work on this publication: Committee reference EPL/278 ISBN 0 580 27321 0 Committees responsible for this Draftfor Developm
3、ent The preparation of this Draft for Development was entrusted to Technical Committee EPL/278, Road transport informatics, upon which the following bodies were represented: Automatic Identification Manufacturers Association (AIM UK) British Telecommunications plc Consumer Policy Committee of BSI De
4、partment of Transport GAMBICA (BEAMA Ltd.) Road Signalling Development Association Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date CommentsDDENV12315-1:1997 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii
5、 Foreword (informative) 2 Text of ENV 12315-1 5DDENV12315-1:1997 ii BSI 07-1999 National foreword This Part of DD ENV 12315 has been prepared by Technical Committee EPL/278, and is the English language version of ENV 12315-1:1996, published by the European Committee for Standardization (CEN). This d
6、raft for Development is not to be reguarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature because the level of innovation on this subject is currently high. It should be applied on this provisional basis so that informati
7、on and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that the UK experience can be reported to the European organization responsible for its conversion to a European Standard. A review of this publication will be
8、 initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its three-year life. The commencement of the review period will be notified by an announcement in BSI Update. According to the replies received by the end of the review p
9、eriod, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the prestandard or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee EPL/278 at BSI, 389 Chiswick High Road, London, W44AL,
10、giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. Cross-references Publication referred to Corresponding British Standard ISO 8824 BS ISO/IEC 8824:1990 Information technology. Open systems interconnection. Specification of abstract sy
11、ntax notation one (ASN.1) ISO 8825 BS ISO/IEC 8825:1990 Information technology. Open systems interconnection. Specification of basic encoding rules for abstract syntax notation one (ASN.1) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENV title pag
12、e, pages 2 to 90 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN PRESTANDARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 12315-1 August 1996 ICS 35.240.60 Desc
13、riptors: Teleprocessing, road transport, traffic, traffic control, information interchange, radiocommunications, open systems interconnection, data transmission, messages, data, specifications English version Traffic and Traveller Information (TTI) TTI Messages via Dedicated Short-Range Communicatio
14、n Part 1: Data Specification Downlink (Roadside to Vehicle) This European Prestandard (ENV) was approved by CEN on 1996-07-24 as a prospective standard for provisional application. The period of validity of this ENV is limited initially to three years. After two years the members of CEN will be requ
15、ested to submit their comments, particularly on the question whether the ENV can be converted into an European Standard (EN). CEN members are required to announce the existance of this ENV in the same way as for an EN and to make the ENV available promptly at national level in an appropriate form. I
16、t is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ir
17、eland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN mem
18、bers Ref. No. ENV 12315-1:1996 EENV12315-1:1996 BSI 07-1999 2 Foreword (informative) This Prestandard has been prepared by Working Group 4 (Sub-Working Group 4.2) of Technical Committee CEN/TC 278 “Road transport and traffic telematics”, the secretariat of which is held by NNI to cover the Work Item
19、 4.2.2. In the field of Traffic and Traveller Information, the innovative rate is high, with many research and development projects under way in many countries, and there is a need to establish prospective standards which allow competitive manufacturers to introduce products to the market in the kno
20、wledge that they can accommodate the future issues of the standard(s) without fundamental change to equipment. It has been submitted as a first draft to TC278 for consideration and review by TC278 plenary meeting members, for initial comment, as CEN Stage32. All comments have been reviewed and the d
21、ocument updated. It is hereby issued to CEN Central Secretariat for distribution in accordance with Internal Regulations (Part 2, Section 7) at CEN Stage 49, for formal voting. No known national standards (identical or conflicting) exist on this subject. This document constitutes: Part 1 of a two-pa
22、rt European Prestandard, being the data specification for one way (roadside to vehicle direction) of a two-way communications link. Part 2 of this Prestandard covers the reverse direction (vehicle to roadside). According to the CEN/CENELEC Internal Regulations, the national standards organisations o
23、f the following countries are bound to announce this European Prestandard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents (informative) Page Foreword (informa
24、tive) 2 Introduction (informative) 5 1 Scope (normative) 5 1.1 General 5 1.2 Embeddance in OSI 7-Layer model 6 1.3 Applications 6 1.3.1 Route guidance data 7 1.3.2 Messages and warnings 9 1.3.3 Car park info 9 1.3.4 Park & ride info 9 2 Normative references (normative) 9 3 Definitions (normative) 9
25、3.1 Definitions 9 3.2 Symbols and abbreviations 11 4 Data organization structure (normative) 12 4.1 File structure 12 4.2 Table structure 13 4.3 Checksums 14 4.3.1 Purpose of checksums 14 4.3.2 Checksum algorithm 14 4.4 Encryption 15 4.5 Organization table ORG (TID 0) 15 4.5.1 Item descriptions 16 5
26、 General data GENDAT (TID 1) (normative) 17 5.1 Item description 18 5.1.1 Fixed data part 18 5.1.2 Optional data part 20 6 Entries and exits (normative) 24 6.1 General 24 6.2 Types of beacon junctions 24 6.3 Criteria for the choice of beacon junctions 25 6.4 Exit description parameters 28 6.4.1 Exit
27、 descriptions for exits into the guided road network 28 6.4.2 Exit description for exits into the unguided road network 32 6.4.3 Parameter examples for different junction types 32 6.5 Principle of exit recognition in the vehicle and position adjustment 35 6.6 Entry/Exit definition ENEX (TID 2) 36ENV
28、12315-1:1996 BSI 07-1999 3 Page 6.6.1 Item description 37 7 Destination handling (normative) 40 7.1 General 40 7.1.1 Beacon region 40 7.1.2 Outer regions 41 7.1.3 Hierarchical division and coding 41 7.1.4 Principles of the decoding algorithm 42 7.2 General rules for coding of the data tables 43 7.2.
29、1 Boundaries of the overview package BOVP e(TID 10) 44 7.2.2 Destination zones of the beacon region DZBR (TID 11) 46 7.2.3 Boundaries of the outer regions BOUT p,e(TID 12 25) 48 7.2.4 List of corner point indices 51 7.2.5 Corner points of all regions COPxxx (TID 27, 28, 29 42) 51 7.2.6 References of
30、 route guidance information REF_RGI e(TID 44) 53 7.2.7 Route guidance information RG_INFO e(TID 45) 55 8 Vehicle and driver specific route choice (normative) 56 8.1 General 56 8.2 Coding of the data tables 57 8.2.1 Route choice table RCT (TID 3) 57 8.2.2 Data section: Road restriction groups 57 8.2.
31、3 Data section: Route type groups 59 8.2.4 Data section: Restriction class matrix 60 9 Definition of links (normative) 61 9.1 General 61 9.2 Coding of the data tables 63 9.2.1 General format of LINK_PT, LINK_TAB and LINK_ADD (TID 50, 51, 52) 63 9.2.2 Detailed description of LINK_PT (TID 50) 65 9.2.3
32、 Description of LINK_TAB (TID 51) 66 9.2.4 Detailed description of LINK_ADD (TID 52) 82 9.3 Link related text messages LINK_TEXT (TID 53) 83 10 Definition of link chains 83 10.1 General 83 10.2 Description of link chains: LC_REL e , LC_QUEUE e(TID 55, 56) 86 Page Annex A (normative) Limitations 87 A
33、nnex B (normative) Summary of tables 87 Annex C (informative) Illustrations 88 Annex D (informative) Guideline for systemdesigner 89 Figure 1 Dedicated short range communication according to OSI 7-Layer model 6 Figure 2 Table use 8 Figure 3 Disassembly of broadcast-data 12 Figure 4 Organisation with
34、 tables 14 Figure 8 Principle of junction with beacon heads in the entry and their infrared communication areas 24 Figure 9 Principle of junction with beacon heads in the exit and some of their infrared communication areas 25 Figure 10 simple beacon junction (best case) 26 Figure 11 beacon junction
35、with nearby junctions 26 Figure 12 complex beacon junction 27 Figure 13 Junction with linear exit 28 Figure 14 Vector description and real route are different 29 Figure 15 Junction with distant exit recognition area 30 Figure 16 Junction with a nearby branch 31 Figure 17 Junction in the unguided roa
36、d network 32 Figure 18 Exit recognition with 1.vector starting in the beacon junction 33 Figure 19 Exit recognition with 1.vector starting in the beacon junction 33 Figure 20 Exit recognition with 1.vector starting in the beacon junction 34 Figure 21 Exit recognition with 1.vector starting in the be
37、acon junction 34 Figure 22 Exit recognition with 1.vector starting at the next junction 34 Figure 23 Exit recognition with 1.vector starting at thenextjunction 35 Figure 24 35 Figure 25 Total region of Europe 41 Figure 26 Total region with destination zones (shaded) and areas (not shaded) 42 Figure
38、27 Destination handling 43ENV12315-1:1996 4 BSI 07-1999 Page Figure 28 Boundary lines of the overview package (BR Beacon Region, OUTi Outer Regions) 44 Figure 29 Coding sample of packages 45 Figure 30 Destination zones of the Beacon region 46 Figure 31 Coding sample of zones 47 Figure 32 Boundary li
39、nes of one outer region 49 Figure 33 Coding sample of areas 49 Figure 34 Ranges of coordinates with different scaling factors 52 Figure 35 Processing of the Route Choice Table (RCT) 56 Figure 36 62 Figure 37 Interrelation between LINK-CHAINS and LINK-Description 63 Figure 38 LINK_ADD 64 Figure 43 Li
40、nk chain tree 83 Figure 44 Link chains with different restriction classes 84 Figure 45 Interrelation between RGI and LINK_CHAINS 85 Table 1 Coding sample of packages 45 Table 2 Coding sample of zones 49 Table 3 Example of a group definition 58 Table 4 Example of a group definition 60 Table 5 Matrix
41、of route classes 60ENV12315-1:1996 BSI 07-1999 5 Introduction (informative) Traffic and Traveller Information may be disseminated through a number of services or means of communication, covering static displays, interactive terminals and in-vehicle equipment. For all such services, the data to be di
42、sseminated and the message structures involved in the various interfaces require clear definition and standard formats, in order to allow competitive products to operate with any received data. This pre-Standard focuses on the data specification for an air-interface via dedicated short-range communi
43、cation, whereby the information is produced at a central location (known as the in-station, central office or traffic information and control centre) and disseminated via a network of roadside beacons. It enables messages to be exchanged between different systems and service providers adopting a var
44、iety of applications specifications. Other pre-Standards are being produced by the CEN TC278 Working Group 4, to cover TTI dissemination via other means or services. It is anticipated that the uses of the data set(s) described in this document will be closely linked to the widespread use of in-vehic
45、le equipment which utilises them known as “beacon data” in an efficient manner to guide drivers through the road network accurately and safely. The principle of operation is to follow detailed guidance, step by step, from one beacon to another. The in-vehicle equipment is expected to offer “fall-bac
46、k” facilities to assist the driver whenever he or she is travelling in an area unequipped with beacons or if the beacon data is unavailable, for whatever reason. 1 Scope (normative) 1.1 GENERAL This pre-Standard provides a common message structure for Traffic and Traveller Information messages which
47、 are disseminated via dedicated beacon infrastructure (for short-range communications, only). It, therefore, provides the framework to enable the providers of information services to utilise such a means of dissemination to supply information into a large number of equipped vehicles, together with t
48、he suppliers of such in-vehicles equipment to receive, process and/or display the messages to the traveller (driver or passenger). The message is structured to fit into the protocol framework for DSRC links, as defined in the standards produced by CEN TC278 WG9. Such links may carry data other than
49、Traffic and Traveller Information, as shown in Figure 1, and, in itself, TTI comprises several (potential or optional) data sets, including: route guidance data messages and warning car park information park and ride information “yellow pages” directories of other services. This pre-Standard covers all discrete data sets which comprise TTI. However, since research and development of several data sets is incomplete, at this time, this is
