ITU-T Y 1221-2010 Traffic control and congestion control in IP-based networks (Study Group 12)《互联网协议(IP)网络中的流量控制和拥塞控制 (研究组12)》.pdf
《ITU-T Y 1221-2010 Traffic control and congestion control in IP-based networks (Study Group 12)《互联网协议(IP)网络中的流量控制和拥塞控制 (研究组12)》.pdf》由会员分享,可在线阅读,更多相关《ITU-T Y 1221-2010 Traffic control and congestion control in IP-based networks (Study Group 12)《互联网协议(IP)网络中的流量控制和拥塞控制 (研究组12)》.pdf(40页珍藏版)》请在麦多课文档分享上搜索。
1、 International Telecommunication Union ITU-T Y.1221TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2010) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Architecture, access, network capabilities and resource managemen
2、t Traffic control and congestion control in IP-based networks Recommendation ITU-T Y.1221 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middlewar
3、e Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.11
4、99 Architecture, access, network capabilities and resource management Y.1200Y.1299Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over NG
5、N Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.229
6、9 Numbering, naming and addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Future networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 For further details, please refer
7、to the list of ITU-T Recommendations. Rec. ITU-T Y.1221 (06/2010) i Recommendation ITU-T Y.1221 Traffic control and congestion control in IP-based networks Summary Recommendation ITU-T Y.1221 provides a general description as well as objectives and procedures for traffic control and congestion contr
8、ol for IP-based networks. In particular, it describes the concepts of the traffic contract between a user and the network. It specifies the IP transfer capabilities (IPTCs) including, for each IPTC, the service model, the associated traffic patterns and conformance definition. History Edition Recomm
9、endation Approval Study Group 1.0 ITU-T Y.1221 2002-03-16 13 1.1 ITU-T Y.1221 (2002) Amend. 1 2004-03-29 13 1.2 ITU-T Y.1221 (2002) Amend. 2 2005-11-29 12 1.3 ITU-T Y.1221 (2002) Amend. 3 2007-10-11 12 2.0 ITU-T Y.1221 2010-06-29 12 ii Rec. ITU-T Y.1221 (06/2010) FOREWORD The International Telecommu
10、nication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information 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
11、 questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide 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 Recommend
12、ations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA 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 Recommendat
13、ion, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g., interoperability
14、 or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions 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 complian
15、ce with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the 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
16、 applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to imp
17、lement this Recommendation. However, implementers are cautioned that this may not represent the latest information 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
18、means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y.1221 (06/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 3 6 General 3 7 Traffic param
19、eters and descriptors . 4 7.1 Definitions 4 7.2 Requirements on traffic parameters and traffic descriptors . 5 7.3 Traffic parameter specifications . 5 8 IP transfer capabilities 5 8.1 Dedicated bandwidth transfer capability 6 8.2 Statistical bandwidth transfer capability 6 8.3 Best effort transfer
20、capability . 8 8.4 Delay-sensitive statistical bandwidth transfer capability . 8 8.5 Conditionally dedicated bandwidth transfer capability 9 9 Functions for traffic control, congestion control, and overload treatment . 12 9.1 Traffic control functions . 12 9.2 Functions for congestion control and ov
21、erload treatment 13 10 Methods and tools for IP traffic engineering 14 10.1 MPLS traffic engineering . 14 10.2 DiffServ-aware MPLS traffic engineering . 14 Annex A The token bucket and the generic byte rate algorithm 15 A.1 The token bucket 15 A.2 The continuous-state token bucket . 15 A.3 The gener
22、ic byte rate algorithm 16 A.4 The virtual scheduling byte rate algorithm . 16 A.5 The continuous-state leaky bucket byte rate algorithm 17 A.6 Throughput behaviour of the GBRA algorithm . 17 Annex B Behaviour of two coordinated generic byte rate algorithms 19 iv Rec. ITU-T Y.1221 (06/2010) Page Appe
23、ndix I Illustration of token bucket behaviour . 20 I.1 Characterization of a flow with a single rate and a single token bucket 20 I.2 Characterization of a flow with two rates and two token buckets (Bp Bs) . 23 Appendix II Relation between IPTC/QoS class and IETF IntServ/DiffServ-specification 25 II
24、.1 Dedicated bandwidth IPTC associated with a suitable QoS class 25 II.2 Statistical bandwidth IPTC associated with a suitable QoS class 26 Appendix III Guidelines for support of services using IP transfer capabilities in a differentiated services environment 27 III.1 Guidelines applicable to all IT
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