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ISO 14827-1-2005 Transport Information and control systems - Data interfaces between centres for transport information and control systems - Part 1 Message defi.pdf

1、 Reference number ISO 14827-1:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 14827-1 First edition 2005-11-01 Transport Information and control systems Data interfaces between centres for transport information and control systems Part 1: Message definition requirements Systmes de commande et dinformatio

2、n des transports Interfaces de donnes entre les centres pour systmes de commande et dinformation des transports Partie 1: Exigences relatives la dfinition du message ISO 14827-1:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file

3、 may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat a

4、ccepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that

5、 the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in a

6、ny form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 7

7、49 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedISO 14827-1:2005(E) ISO 2005 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 2 3 Terms and definitions. 2 4 Symbols and abbreviated terms . 3

8、 5 Requirements 4 5.1 Two-way data exchange. 4 5.2 High-level definition 4 5.3 Definitions define expected functionality. 4 5.4 Timing and other issues 5 5.5 Additional attributes. 5 6 Message definition requirements 5 6.1 Name 5 6.2 Definition . 5 6.3 Remarks. 5 6.4 Message body . 5 6.5 Message typ

9、e 5 6.6 Subscription type 6 6.7 Initial publication 6 6.8 Subsequent publications . 6 6.9 Id. 6 Annex A (normative) Information object specification 7 Annex B (informative) Examples 8 Annex C (informative) Concept of operations. 10 ISO 14827-1:2005(E) iv ISO 2005 All rights reservedForeword ISO (the

10、 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 committe

11、e 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 electrotechni

12、cal standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member b

13、odies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 a

14、ny or all such patent rights. ISO 14827-1 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems, Working group 9, with the collaboration of: European Road Transport Telematics Implementation Co-ordination Organisation (ERTICO); Comite Europeen de Normalisation (CEN); American

15、 Association of State Highway and Transportation Officials (AASHTO); Institute of Transportation Engineers (ITE); and National Electrical Manufacturers Association (NEMA). ISO 14827 consists of the following parts, under the general title Transport information and control systems Data interfaces bet

16、ween centres for transport information and control systems: Part 1: Message definition requirements Part 2: DATEX-ASN ISO 14827-1:2005(E) ISO 2005 All rights reserved v Introduction In the 1980s and 1990s, transport networks became increasingly congested and computer technologies were deployed to mo

17、re efficiently manage the limited transport network. As these systems were deployed, it became increasingly important to integrate nearby systems to properly provide the required services. One of the first efforts to standardize the interface between transport control centres was a European Union ef

18、fort led by the DATEX Task Force. In May 1993, this group was established as a horizontal activity to coordinate the diverging developments which were ongoing within the framework of the Advanced Transport Telematics (ATT) Programme. Within the ATT Programme, three different data exchange systems we

19、re developed, namely INTERCHANGE, EURO-TRIANGLE and STRADA. The group produced a set of basic tools to meet existing needs, including a common Data Dictionary, a common set of EDIFACT messages and a common Geographical Location Referencing system. The initial solution provided a common interface whi

20、ch satisfied the basic requirements of existing systems and was named the Data Exchange Network (DATEX-Net) Specifications for Interoperability. During the initial efforts to deploy this standard, there was a growing sense that the message structure should be better organized and should be defined u

21、sing Abstract Syntax Notation One (ASN.1) rather than EDIFACT. ASN.1 presents a standard notation for the definition of data types and values. A data type is a class of information (for example, numeric, textual, still image or video information). A data value is an instance of such a class. ASN.1 d

22、efines several basic types and their corresponding values, and rules for combining them into more complex types and values. These types and values can then be encoded into a byte stream according to any of several standardized encoding rules. Efforts to standardize communications between transport c

23、ontrol centres were also underway in other parts of the world. In 1997, all of these efforts began to merge, with the United States developing the initial draft of the ASN.1 structures for the Data Exchange in Abstract Syntax Notation (DATEX-ASN). These structures, called data packets, were then pla

24、ced within a procedural context and submitted to the ISO standardization process. A portion of the submittal dealt with the specification of messages. As this portion of the document could apply to various protocols, it was placed in ISO 14827-1. The remainder of the original submittal formed the ba

25、sis of the Application Layer protocol and was placed in ISO 14827-2. Thus, Part 2 defines only one way to implement the messages that are specified in the format defined by Part 1. Due to the flexibility required by the rapidly developing Transport Information and Control Systems environment, the re

26、sulting International Standard uses a very generic structure. Thus, although initially intended to be an International Standard for TICS, it is flexible enough to be used for virtually any data exchange. INTERNATIONAL STANDARD ISO 14827-1:2005(E) ISO 2005 All rights reserved 1 Transport Information

27、and control systems Data interfaces between centres for transport information and control systems Part 1: Message definition requirements 1 Scope This part of ISO 14827 defines the format that should be used to document those end-application messages that are to be exchanged between and among centra

28、l systems. The format is protocol-independent to the extent practical. For example, this one format can be used to define data exchanges that may apply to DATEX-ASN, CORBA, or other application protocols. In general, each system can be viewed as consisting of the interfaces as shown in Figure 1: Key

29、 1 application interface 2 operator interface 3 communication interface 4 database interface 5 communications cloud 6 client system 7 server system NOTE The communications cloud between the systems may be complex or simple. Figure 1 System interface This part of ISO 14827 deals only with the communi

30、cation interface and is at a very high level. Other parts define how end-application messages can be exchanged using various application layer protocols. While this part of ISO 14827 has been designed to meet the unique requirements of a TICS environment, it has been designed in a generic fashion an

31、d thus could be used for other data exchanges as well. ISO 14827-1:2005(E) 2 ISO 2005 All rights reserved2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the

32、 latest edition of the referenced document (including any amendments) applies. ISO/IEC 7498-4, Information processing systems Open Systems Interconnection Basic Reference Model Part 4: Management framework ISO/IEC 8824-1, Information technology Abstract Syntax Notation One (ASN.1) Specification of b

33、asic notation ISO/IEC 8824-2, Information technology Abstract Syntax Notation One (ASN.1) Information object specification ISO/IEC 8825-1, Information technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) I

34、SO/IEC 8825-2, Information Technology ASN.1 encoding rules: Specification of Packed Encoding Rules (PER) ISO 9735, Electronic data interchange for administration, commerce and transport (EDIFACT) Application level syntax rules 3 Terms and definitions For the purposes of this document, the following

35、terms and definitions apply. 3.1 application layer top layer of the OSI seven-layer model as defined in ISO/IEC 7498-4 NOTE This layer defines the structure and format of the data packet content along with the rules and procedures for exchanging data packets. 3.2 center any computer or network that

36、is required to meet a standardized communications interface over a fixed-point communications network, regardless of whether the “center” is the only system within the building or just one of many, or even if the “center” is located in the field NOTE This part of ISO 14827 only deals with communicat

37、ions that are between “centers”. 3.3 client computer or application which requests and accepts data from a server computer or application using some kind of protocol 3.4 command data packet which is prepared by one system in order to control some function(s) of another system NOTE Commands may be co

38、nveyed as a subscription (request) or publication (reply) depending on the design of the specific data exchange. 3.5 data packet entity of data that can be sent between end-application systems in order to exchange information NOTE A data packet relates to the Application Layer of the OSI stack and m

39、ay be broken into several pieces by lower layer protocols. ISO 14827-1:2005(E) ISO 2005 All rights reserved 3 3.6 end application message message data structure that has been associated with a specific meaning and which, when properly sent in a data packet, an instance of the structure can convey in

40、formation between systems NOTE A data structure might, for example, be specified to include a list of speeds from detector stations. This one data structure could be used to specify the content of several messages (e.g. the list of current speeds being detected, the list of stored speeds that will t

41、rigger a congestion warning if current values fall below the indicated level, or a request for a list of locations where the current speed is less than the indicated speed). An instance of the message would then contain actual values. 3.7 message instance specific instance of an end application mess

42、age 3.8 message specification documentation defining the meaning of a message, the result of applying this part of ISO 14827 to a specific message 3.9 profile International Standard that defines rules by only combining requirements of other International Standard EXAMPLE An application profile is a

43、profile that specifies the application, presentation, and session layers by referencing a group of other International Standards. 3.10 protocol set of formal rules describing how to transmit data, especially across a network 3.11 publication reply data which have been prepared by a server, usually i

44、n response to a subscription NOTE In some cases, a publication may be termed a “reply” or a “response”. 3.12 server computer or application which receives and responds to requests for data from client computers or applications using some kind of protocol 3.13 subscription request data packet which i

45、s prepared by a client in order to request current or future publication(s) NOTE In some cases, a subscription may be termed a “request”. 4 Symbols and abbreviated terms ASN.1 Abstract Syntax Notation 1 (ISO/IEC 8824-1 and ISO/IEC 8824-2) BER Basic Encoding Rules (ISO/IEC 8825-1) CORBA Common Object

46、 Request Broker Architecture ISO 14827-1:2005(E) 4 ISO 2005 All rights reservedDATEX-ASN Data Exchange in Abstract Syntax Notation EDIFACT Electronic Data Interchange for Administration, Commerce and Transport (ISO 9735) OID Object Identifier OSI Open Systems Interconnect PER Packed Encoding Rules (

47、ISO/IEC 8825-2) TICS Transport Information and Control Systems 5 Requirements This part of ISO 14827 provides a standardized format that can be used to define end application messages for multiple application protocols; each application protocol has its own unique set of services. In order to provid

48、e a practical definition of messages, a number of assumptions were made about the services provided by the lower layers of the protocol stack and overall design concepts. These assumptions are documented in this clause. NOTE Nothing in this part of ISO 14827 removes the agency responsibility to ensu

49、re that the message does not contravene any legal obligation placed upon them by the laws of the respective countries. 5.1 Two-way data exchange This part of ISO 14827 assumes that the protocol provides for request-reply style of communications where the reply may be in a different format than the request. Further, it recognizes that some protocols allow for a series of replies to a single request; thus, it has been designed to allow for this operation as well. It assumes that requests are unsol

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