ISO-16512-1-2005.pdf
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1、 Reference number ISO/IEC 16512-1:2005(E) ISO/IEC 2005 INTERNATIONAL STANDARD ISO/IEC 16512-1 First edition 2005-02-15 Information technology Relayed Multicast Control Protocol (RMCP) Part 1: Framework Technologies de linformation Protocole de multidiffusion relay (RMCP) Partie 1: Cadre gnral Copyri
2、ght International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:30:13 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 16512-1:2005(E) PDF disclaimer This PDF file
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5、tion parameters were optimized for printing. Every care has been taken to ensure that 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/IEC 2005 All rights reserved. U
6、nless 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 country of the requester. IS
7、O copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2005 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licen
8、see=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:30:13 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 16512-1:2005(E) ISO/IEC 2005 All rights reserved iii CONTENTS Page 1 Scope 1 2 Normative references . 1 3 Definitions 1 4 Abbreviations. 2 5
9、 Framework of RMCP. 2 5.1 Introduction. 2 5.2 Basic concept of RMCP 3 5.3 RMCP data delivery models . 5 5.3.1 Simplex delivery model for real-time services 5 5.3.2 Simplex delivery model for reliable services 5 5.3.3 N-plex delivery model for real-time services 6 5.3.4 N-plex delivery model for reli
10、able services 6 6 RMCP service scenario 6 7 RMCP functions. 8 7.1 Session initialization . 8 7.2 Session join. 8 7.3 Session leave. 8 7.4 Session release 8 7.5 Session maintenance. 8 7.6 Session monitoring 9 8 Message structure. 9 8.1 Basic message structure 9 8.2 Option format 9 8.2.1 Option types
11、and values 10 Bibliography 11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:30:13 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 16512-1:2
12、005(E) iv ISO/IEC 2005 All rights reserved 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 of ISO or IEC participate in the developmen
13、t 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 organizations, governmental and non-governmental,
14、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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joi
15、nt technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attent
16、ion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 16512-1:2005 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technolog
17、y, Subcommittee SC 6, Telecommunications and information exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T Rec. X.603. ISO/IEC 16512 consists of the following parts, under the general title Information technology Relayed Multicast Control Protocol (RMCP)
18、: Part 1: Framework Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:30:13 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 16512-1:2005(E) ISO
19、/IEC 2005 All rights reserved v Introduction This Recommendation | International Standard specifies the Relayed Multicast Protocol (RMCP) used for realizing relayed multicast. Relayed multicast, also known as overlay multicast or application-layer multicast, is a data-delivery scheme for group commu
20、nications applications over unicast. RMCP employs intermediate Multicast Agents for relaying application data from one or more senders to many receivers. The design of RMCP has been motivated from the following observations: In the marketplaces, diverse group applications and services have been prov
21、isioned commercially all over the world. Their examples include Internet TV, remote education, real-time streaming media applications, live broadcasting of special events such as the Victoria Show, stock-tickers, and so on. At present, most of the group applications mentioned above use a replicated
22、IP unicast method to realize multicast services. As a result, those applications have problems about degradation of service quality due to the limitation in the number of simultaneous service users. In the business model that means less revenue or profit. IP multicast has been known as an effective
23、transport technology for providing multicast services. Nevertheless, the IP multicast has not been deployed widely over the Internet due to several reasons, including the following: high deployment cost along with an uncertain Return-on-Investment model; IP multicast alone cannot support all kinds o
24、f group applications. Network services which offer, for example, group file transfer or network games, need a reliable multicast transport mechanism. However, even current reliable multicast transport mechanisms still have unresolved problems including that of scalability, flow control, congestion c
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