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1、Reference number ISO/IEC 13252:1999(E) ISO/IEC 1999 INTERNATIONAL STANDARD ISO/IEC 13252 First edition 1999-07-01 Information technology Enhanced communications transport service definition Technologies delinformation Dfinition du service de transport de communications amlior ISO/IEC 13252:1999(E) P
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5、 1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any 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
6、country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO/IEC 1999 All rights reserved ISO/IEC 13252 : 1999 (E) ISO/IEC 1999 All rights reserved iii Contents Page
7、 1Scope1 2Normative references1 2.1Identical Recommendations | International Standards.1 3Definitions2 3.1Reference Model definitions.2 3.2Service definition conventions2 3.3Quality-of-Service Framework definitions2 3.4Enhanced Communications Transport Service definitions2 4Abbreviations .3 5Convent
8、ions4 5.1General conventions4 5.2Parameters.4 5.3Notations .4 6Overview and general characteristics.4 7Features of the Enhanced Communications Transport Service5 8Model of the Enhanced Communications Transport Service.5 8.1Types of Transport Connection.5 8.2Model of Transport Connection6 9Transport
9、Connection characteristics .6 9.1Active group integrity .6 9.1.1AGI policy.7 9.1.2Population7 9.1.3TC type7 9.1.4Transmit diversity7 9.1.5Receive diversity.7 9.1.6Transmit concurrency7 9.2 Quality of service.7 10Quality of service for Transport Connections 8 10.1QoS classification8 10.1.1TC performa
10、nce.8 10.1.2TC reliability.9 10.1.3TC ordering.10 10.1.4Miscellaneous11 10.2Levels of QoS agreement11 10.2.1Best effort level.11 10.2.2Guaranteed level11 10.3QoS negotiation mechanisms11 10.3.1Generic QoS negotiation.11 10.3.2OA QoS negotiation12 10.3.3SWA QoS negotiation.14 10.3.4Considerations.14
11、10.4Phases of QoS agreement15 11Enhanced Communications Transport Service primitives and parameters.16 11.1Definitions.16 11.2Sequence of primitives at a TSAP.16 iv Page 12TC Creation service21 12.1Function.21 12.2Types of primitives and parameters 21 12.2.1Called address .21 12.2.2Calling address21
12、 12.2.3Responding address.21 12.2.4TC-characteristics21 12.2.5TS-user data.22 12.2.6Reason.22 12.3Sequence of primitives22 13TC Invitation service22 13.1Function.22 13.2Types of primitives and parameters 23 13.2.1Called address .23 13.2.2Calling address23 13.2.3TC-characteristics23 13.2.4TS-user dat
13、a.23 13.3Sequence of primitives23 13.3.1Invitation for a heterogeneous TC.23 13.3.2Invitation for a late join.24 14TC Join service.24 14.1Function.24 14.2Types of primitives and parameters 24 14.2.1Called address .24 14.2.2Calling address25 14.2.3Responding address.25 14.2.4TC-characteristics25 14.2
14、.5TS-user data.25 14.2.6Reason.25 14.3Sequence of primitives25 15Data Transfer service26 15.1Function.26 15.2Types of primitives and parameters 26 15.2.1Called address .26 15.2.2Calling address26 15.2.3TC-characteristics26 15.2.4Status.27 15.2.5TS-user data.27 15.3Sequence of TS primitives 27 16Paus
15、e service 27 16.1Function.27 16.2Types of primitive and parameters28 16.2.1Reason.28 16.3Sequence of TS primitives suspending data transfer.28 17Resume service.28 17.1Function.28 17.2Types of primitive and parameters28 17.2.1Reason.29 17.3Sequence of primitives29 18Report service.29 18.1Function.29
16、18.2Types of primitive and parameters29 18.2.1Reason.29 18.3Sequence of TS primitives 30 ISO/IEC 13252 : 1999 (E) ISO/IEC 1999 All rights reserved v Page 19TC Leave service30 19.1Function.30 19.2Types of primitives and parameters 30 19.2.1Called address .31 19.2.2Calling address31 19.2.3Reason.31 19
17、.3Sequence of primitive31 19.3.1TS-user rejection of a TC Creation .31 19.3.2TS-user rejection of a TC Join 32 19.3.3TS-provider rejection of a TC Join attempt.32 19.3.4TS-user invoked Leave32 19.3.5TS-provider expulsion of a TS-user Leave .33 20TC Termination service33 20.1Function.33 20.2Types of
18、primitives and parameters 33 20.2.1Reason.33 20.2.2TS-user data.33 20.3Sequence of primitives34 20.3.1TC-owner invocation of a TC termination34 20.3.2TS-provider invocation of a TC termination.34 20.3.3Simultaneous TC-owner and TS-provider invocation of a TC termination34 20.3.4Unsuccessful TC Creat
19、ion with multiple TS-user rejection(s)35 20.3.5Overall TS-user rejections of a TC creation attempt.35 20.3.6TS-provider rejection of a TC creation attempt due to lack of local resource 36 20.3.7TS-provider rejection of a TC creation attempt due to incomplete TC-characteristics.36 21TC-ownership serv
20、ice.36 21.1Function.36 21.2Types of primitives and parameters 37 21.2.1Called address .37 21.2.2Calling address37 21.2.3Responding address.37 21.2.4TS-user data.37 21.2.5Reason.37 21.3Sequence of primitives37 21.3.1Ownership transfer to a specified TS-user 37 21.3.2Ownership transfer to the whole TS
21、-user candidates37 22Token service38 22.1Function.38 22.2Types of primitives and parameters 38 22.2.1Called address .38 22.2.2Calling address38 22.2.3Responding address.39 22.2.4TS-user data.39 22.2.5Reason.39 22.3Sequence of primitives39 22.3.1Token distribution to a specified TS-user .39 22.3.2Tok
22、en return from a specified TS-user40 22.3.3Token retrieval from a specified TS-user40 22.3.4Token request from a TS-user.41 Annex A TC ordering relationships.42 A.1Properties of ordering42 A.1.1No ordering .42 A.1.2Local ordering.42 A.1.3Causal ordering .42 A.1.4Partial ordering43 A.1.5Total orderin
23、g43 ISO/IEC 13252 : 1999 (E) ISO/IEC 1999 All rights reserved ISO/IEC?13252?:?1999?(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members
24、 of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organi
25、zations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated
26、to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 13252 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunication
27、s and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T Recommendation X.605. Annex A forms an integral part of this International Standard. vi ISO/IEC 1999 All rights reserved Introduction This Recommendation | International Standard defines
28、 a transport service, named Enhanced Communications Transport Service (ECTS), which provides for a multicast capability and enhanced Quality of Service (QoS). This Recommen- dation | International Standard defines a wide range of services ranging from unreliable unicast with best-effort QoS to relia
29、ble multicast with guaranteed QoS. In this way, this Recommendation | International Standard is meant to provide for a uniform and universal service interface between transport protocols and applications of the present and the future information age, especially for those applications requiring versa
30、tile and powerful multimedia group communication capabilities underneath. Figure Intro.1 depicts the general architectural block diagram showing how ECTS relates to other protocols in the transport, application as well as network layers. ECTP in Figure Intro. 1 is a protocol which is supposed to sup
31、port all the services defined by this Recommendation | International Standard. ECTP is (to be) defined in a separate Recommendation | International Standard. Note that not all the transport protocols shown in Figure Intro. 1 support all the services defined by ECTS. For example, TCP provides a best-
32、effort reliable unicast service; UDP supports a best-effort unreliable multicast service. MTP, RMP, and SRM support reliable multicast but with null QoS. RTP provides means for exchanging synchronization information but does not define mechanisms to provide the synchronization itself. ECTP, a compan
33、ion protocol to ECTS, further will utilize, wherever possible, the multicast capabilities of the underlying network infrastructures. For example, in operation in Internet, ECTP will make extensive use of the multicast capabilities of IPv4 and IPv6 and rely on RSVP for QoS provisioning by network res
34、ource reservation. As another example, in operation over intrinsic ATM networks, ECTP will rely on the ATM capabilities for both multicast and QoS. T0731430-98/d01 UDPTCP CLTPRTPMTPSRMECTPCOTP ECTS VOD Others New Apps T.120 Apps Other Group Multimedia Apps Conventional Apps PSDN, PSTN, ISDN, FR, ATM
35、, LAN, - - - - - - - - - - - - - - - - - - - - - Others Apps Applications Figure Intro. 1 Architectural block diagram for ECTS IPv4 / IPv6 + RSVP, CLNP ISO/IEC?13252?:?1999?(E) vii ISO/IEC 1999 All rights reserved ISO/IEC 13252 : 1999 (E) ITU-T Rec. X.605 (1998 E)1 INTERNATIONAL STANDARD ISO/IEC 132
36、52 : 1999 (E) ITU-T Rec. X.605 (1998 E) ITU-T RECOMMENDATION INFORMATION TECHNOLOGY ENHANCED COMMUNICATIONS TRANSPORT SERVICE DEFINITION 1Scope This Recommendation | International Standard defines in an abstract way the externally visible service provided by the Transport Layer in terms of: a)the pr
37、imitive actions and events of the service; b)the parameter data associated with each primitive action and event; c)the relationship between, and the valid sequences of, these actions and events. The service defined in this Recommendation | International Standard is that which is provided by the Enha
38、nced Communications Transport Protocol (in conjunction with the Network Service) and which may be used by any application protocol. The service can also be provided by other protocols possibly each supporting a subset of the services defined herein. The primitives specified in this Recommendation |
39、International Standard support a connection-mode service and a connectionless service. In some cases of connectionless-mode service supporting enhanced communications, certain operations may also be necessary prior to the commencement of data transfer, e.g. agreement on quality of service. For the d
40、ata transfer phase of either connection-mode or connectionless-mode services, there may be a range of data- ordering characteristics. No implication is made in this Recommendation | International Standard regarding the inclusion or exclusion of any of the above characteristics given the service prim
41、itives specified herein. 2Normative references The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recommendation | International Standard. At the time of publication, the editions indicated were valid. All
42、 Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation | International Standard are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain
43、 registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. 2.1Identical Recommendations | International Standards ITU-T Recommendation X.200 (1994) | ISO/IEC 7498-1:1994, Information techno
44、logy Open Systems Interconnection - Basic Reference Model: The Basic Model. ITU-T Recommendation X.210 (1993) | ISO/IEC 10731:1994, Information technology Open Systems Interconnection Basic Reference Model: Conventions for the definition of OSI services. ITU-T Recommendation X.214 (1995) | ISO/IEC 8
45、072:1996, Information technology Open Systems Interconnection Transport service definition. ITU-T Recommendation X.641 (1997) | ISO/IEC 13236:1998, Information technology Quality of Service: Framework. ITU-T Recommendation X.802 (1995) | ISO/IEC TR 13594:1995, Information technology Lower layers sec
46、urity model. ISO/IEC 13252 : 1999 (E) 2ITU-T Rec. X.605 (1998 E) 3Definitions For the purposes of this Recommendation | International Standard, the following definitions apply. 3.1Reference Model definitions This service definition is based on the concepts developed in the OSI Basic Reference Model
47、(see ITU-T Rec. X.200 | ISO/IEC 7498-1), and makes use of the following terms defined in it: a)Transport Layer; b)Transport Service; c)transport-service-access-point; d)transport-service-access-point address; e)transport-service-data-unit; f)Network Layer; g)Network Service. 3.2Service definition co
48、nventions This service definition also make use of the following terms defined in ITU-T Rec. X.210 | ISO/IEC 10731, as they apply to the Transport Layer: a)service-user; b)service-provider; c)primitive; d)request; e)indication; f)response; g)confirm. 3.3Quality-of-Service Framework definitions This
49、service definition is compliant with the QoS Framework (see ITU-T Rec. X.641 | ISO/IEC 13236) in that it describes facilities which pertain to the Transport Layer as specified in the relevant clause of the QoS Framework: a)QoS characteristic; b)QoS mechanism; c)QoS parameter. 3.4Enhanced Communications Transport Service definitions For the purposes of this Recommendation | International Standard, the following definitions also apply: 3.4.1transport connection: A multicast connection established among TS-users for the purpose of