1、 International Telecommunication Union ITU-T X.607.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2008) SERIES X: DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY OSI networking and system aspects Networking Information technology Enhanced communications transport protocol: Specification
2、 of QoS management for duplex multicast transport Recommendation ITU-T X.607.1 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY PUBLIC DATA NETWORKS X.1X.199 OPEN SYSTEMS INTERCONNECTION X.200X.299 INTERWORKING BETWEEN NETWORKS X.300X.399 MESSAGE HANDLING SYSTEMS
3、 X.400X.499DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Efficiency X.630X.639 Quality of service X.640X.649 Naming, Addressing and Registration X.650X.679 Abstract Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT X.700X.799 SECURITY X.800X.849 OSI APPLICATIONS X.
4、850X.899 OPEN DISTRIBUTED PROCESSING X.900X.999 INFORMATION AND NETWORK SECURITY X.1000X.1099 SECURE APPLICATIONS AND SERVICES X.1100X.1199 CYBERSPACE SECURITY X.1200X.1299SECURE APPLICATIONS AND SERVICES X.1300X.1399 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T
5、 X.607.1 (11/2008) i INTERNATIONAL STANDARD ISO/IEC 14476-4 RECOMMENDATION ITU-T X.607.1 Information technology Enhanced communications transport protocol: Specification of QoS management for duplex multicast transport Summary This Recommendation | International Standard describes quality of service
6、 (QoS) management functions for the duplex multicast transport defined in Recommendation ITU-T X.607 | ISO/IEC 14476-3. QoS management functions such as QoS negotiation, QoS monitoring and QoS maintenance are described. Protocol details such as packet format, parameter values and procedures are also
7、 described. This protocol can be used for applications that require many-to-one data delivery service with QoS managing facility; the protocol is expected to provide transport service to data gathering applications, etc. Source Recommendation ITU-T X.607.1 was approved on 13 November 2008 by ITU-T S
8、tudy Group 11 (2009-2012) under Recommendation ITU-T A.8 procedure. An identical text is also published as ISO/IEC 14476-4. ii Rec. ITU-T X.607.1 (11/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, informatio
9、n 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 standardizing telecommunications on a worldwid
10、e 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 is covered by the procedure laid down in WTSA
11、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 to indicate both a telecommunication administra
12、tion 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 achieved when all of these mandatory provisions
13、 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. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the
14、 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, whether asserted by ITU members or others outside of
15、 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 cautioned that this may not represent the latest i
16、nformation and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2010 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T X.607.1 (11/2008) iii CONTENTS
17、 Page 1 Scope . 1 2 Normative references 1 3 Definitions 1 3.1 Terms defined in Rec. ITU-T X.605 | ISO/IEC 13252 1 3.2 Terms defined in Rec. ITU-T X.606 | ISO/IEC 14476-1 1 3.3 Terms defined in Rec. ITU-T X.606.1 | ISO/IEC 14476-2 . 2 3.4 Terms defined in Rec. ITU-T X.607 | ISO/IEC 14476-3 2 4 Abbre
18、viations 2 4.1 Packet types. 2 4.2 Miscellaneous 3 5 Overview 3 6 Components for QoS management. 5 6.1 Base header 5 6.2 QoS parameters 6 6.3 QoS extension element. 7 6.4 Acknowledgement element . 7 6.5 Packets used for QoS management . 8 7 QoS negotiation for duplex multicast connection 8 7.1 Negot
19、iation procedures. 9 7.2 QoS negotiation in the tree hierarchy 10 7.3 Resource reservation 10 8 QoS monitoring and maintenance for the forward channel 10 8.1 QoS monitoring for the forward multicast channel. 11 8.2 QoS maintenance for the forward multicast channel. 13 9 QoS monitoring and maintenanc
20、e for the backward channel 15 9.1 QoS monitoring for the backward unicast channel . 15 9.2 QoS maintenance for the backward unicast channel . 16 Annex A Implementation considerations 18 iv Rec. ITU-T X.607.1 (11/2008) Introduction This Recommendation | International Standard specifies the Enhanced C
21、ommunications Transport Protocol (ECTP), which is a transport protocol designed to support Internet multicast applications running over multicast-capable networks. ECTP operates over IPv4/IPv6 networks that have the IP multicast forwarding capability with the help of IGMP and IP multicast routing pr
22、otocols, as shown in Figure 1. ECTP could possibly be provisioned over UDP. Figure 1 ECTP Model ECTP is designed to support tightly controlled multicast connections in simplex, duplex and N-plex applications. ECTP part 4 QoS management (this Recommendation | International Standard) specifies the qua
23、lity of service (QoS) management functionality for stable management in the duplex multicast connection. The QoS management functionality consists of QoS negotiation, QoS monitoring and QoS maintenance operations. The procedures of reliability control in duplex connection have been defined in ECTP p
24、art 3 (Recommendation ITU-T X.607 | ISO/IEC 14476-3). In ECTP-3 duplex multicast connection, the participants are classified into one Transport Connection Owner (TC-Owner) and many Transport Services users (TS-users). TC-Owner will be designated among the TS-users before the connection begins. In th
25、e duplex multicast connection, the two types of data transports are supported: multicast data transport from TC-Owner to all the other TS-users and unicast data transport from TS-users to TC-Owner. After the connection is created, TC-Owner can transmit multicast data to the group, whereas each TS-us
26、er is allowed to send unicast data to TC-Owner just after it gets a token from the TC-Owner. For QoS management in the duplex multicast connection, the TC-Owner triggers the connection creation process. Some or all of the enrolled TS-users will participate in the connection and become the designated
27、 “active TS-users“. The TS-users who are active at this stage are able to participate in negotiating the desired QoS level for the session. In the duplex multicast connection, TS-users can send the data to TC-Owner, which each TS-user negotiates with TC-Owner for a QoS parameter for backward unicast
28、 data channel. TC-Owner proposes the target value of QoS parameter for forward multicast data channel and backward unicast data channel. If QoS negotiation is enabled, each TS-user can propose modified values of QoS parameters for forward multicast data channel and backward unicast data channel. TC-
29、Owner arbitrates these modified values of QoS parameters for two types of data transport. These arbitrated values are delivered to TS-users via subsequent Heartbeat (HB) or Join Confirm (JC) packets, and will be used for QoS monitoring and maintenance. Any enrolled TS-user that is not active at this
30、 stage may participate in the connection as a late-joiner, but will have to accept the established QoS level. After the connection is created, TC-Owner begins to transmit multicast data and some of TS-users who get a token from TC-Owner can send unicast data to TC-Owner. While the connection is acti
31、ve, TC-Owner monitors the status of the session via feedback control packets from the active TS-users. TC-Owner may take a range of actions if network problems (such as severe congestion) are indicated by the feedback received from active TS-users. These actions include adjusting the data transmissi
32、on rate, suspending multicast data transmission temporarily, or in the last resort, terminating the connection. ECTP part 4 QoS management Specification can be used by the multicast applications that require supporting various QoS requirements and the corresponding billing/charging models. ISO/IEC 1
33、4476-4:2010 (E) Rec. ITU-T X.607.1 (11/2008) 1 INTERNATIONAL STANDARD RECOMMENDATION ITU-T Information technology Enhanced communications transport protocol: Specification of QoS management for duplex multicast transport 1 Scope This Recommendation | International Standard provides a specification o
34、f QoS management for accomplishing desirable QoS for a duplex multicast transport connection. For this purpose, this Specification describes the QoS management operations in duplex multicast transport connection such as QoS negotiation, QoS monitoring and QoS maintenance. This Recommendation | Inter
35、national Standard is an integral part of ECTP-3 (Rec. ITU-T X.607 | ISO/IEC 14476-3). All of the protocol components, including packet formats and protocol procedures specified in Rec. ITU-T X.607 | ISO/IEC 14476-3, are also valid in this Recommendation | International Standard. 2 Normative referenc
36、es 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 Recommendations and Standards are subject t
37、o 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 registers of currently valid International
38、Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. Recommendation ITU-T X.601 (2000), Multi-peer communications framework. Recommendation ITU-T X.602 (2004) | ISO/IEC 16513:2005, Information technology Group management protoc
39、ol. Recommendation ITU-T X.605 (1998) | ISO/IEC 13252:1999, Information technology Enhanced Communications Transport Service Definition. Recommendation ITU-T X.606 (2001) | ISO/IEC 14476-1:2002, Information technology Enhanced Communications Transport Protocol: Specification of simplex multicast tra
40、nsport. Recommendation ITU-T X.606.1 (2003) | ISO/IEC 14476-2:2003, Information technology Enhanced Communications Transport Protocol: Specification of QoS management for simplex multicast transport. Recommendation ITU-T X.607 (2007) | ISO/IEC 14476-3:2008, Information technology Enhanced communicat
41、ions transport protocol: Specification of duplex multicast transport. Recommendation ITU-T X.608 (2007) | ISO/IEC 14476-5:2008, Information technology Enhanced communications transport protocol: Specification of N-plex multicast transport. 3 Definitions 3.1 Terms defined in Rec. ITU-T X.605 | ISO/IE
42、C 13252 This Recommendation | International Standard is based on the concepts developed in Enhanced Communications Transport Service (Rec. ITU-T X.605 | ISO/IEC 13252): a) QoS parameters; b) QoS negotiation; c) QoS arbitration. 3.2 Terms defined in Rec. ITU-T X.606 | ISO/IEC 14476-1 This Recommendat
43、ion | International Standard is described based on the concepts and terms developed in the specification of simplex multicast transport on ECTP-1: a) application; b) packet; ISO/IEC 14476-4:2010 (E) 2 Rec. ITU-T X.607.1 (11/2008) c) sender; d) receiver; e) tree; f) parent; g) child. 3.3 Terms define
44、d in Rec. ITU-T X.606.1 | ISO/IEC 14476-2 This Recommendation | International Standard is described based on the concepts and terms developed in the specification of simplex multicast transport on ECTP-2: a) QoS monitoring; b) QoS maintenance. 3.4 Terms defined in Rec. ITU-T X.607 | ISO/IEC 14476-3
45、This Recommendation | International Standard is described based on the concepts and terms developed in the specification of duplex multicast transport on ECTP-3: a) SU (Sending TS-User) Some of the ECTP-3 TS-users can send unicast data to the TC-Owner. A sending TS-user (SU) is a TS-user who gets a
46、token from TC-Owner. Only the SU is allowed to send unicast data to TC-Owner. In other words, before sending unicast data, each user must request a token to TC-Owner. b) Token It represents the rights for a TS-user to transmit data. The TS-user who has a token is called a Sending TS-User (SU). The t
47、okens are managed by TC-Owner. c) Forward data channel It represents the multicast data channel from TC-Owner to the group members. TC-Owner sends multicast data to all the other group members over IP multicast address. d) Backward data channel It represents the unicast data channel, in which the da
48、ta packet flows from an SU to TC-Owner. An SU can send unicast data to TC-Owner over IP unicast address. 4 Abbreviations For the purposes of this Recommendation | International Standard, the following abbreviations apply: 4.1 Packet types ACK Acknowledgment CC Connection Creation Confirm CR Connecti
49、on Creation Request CT Connection Termination Request DT Data HB Heartbeat HBACK Heartbeat Acknowledgment JC Late Join Confirm ND Null Data TC Tree Join Confirm TGC Token Get Confirm TGR Token Get Request TRC Token Return Confirm TRR Token Return Request ISO/IEC 14476-4:2010 (E) Rec. ITU-T X.607.1 (11/2008) 3 4.2 Miscellaneous ADN Active Descendant Number API Application Programming Interface CHQ Controlled Highest Quality Diffserv Differentiated Services ECTP Enhanced Communications Transport Protocol ECTP-5 Enhanced Communications
