1、 International Telecommunication Union ITU-T Series HTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 12(11/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSGateway control protocol: Priority traffic treatment by ITU-T H.248 gateways ITU-T H-series Recommendations Supplement 12 ITU-T H-SE
2、RIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures H.240H.259 Coding of m
3、oving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.360H.369 Supplemen
4、tary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and services H.520H.529
5、 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIM
6、EDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720
7、H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 E-HEALTH MULTIMEDIA SERVICES AND APPLICATIONS Interoperability complia
8、nce testing of personal health systems (HRN, PAN, LAN and WAN) H.820H.849 Multimedia e-health data exchange services H.860H.869 For further details, please refer to the list of ITU-T Recommendations. H series Supplement 12 (11/2013) i Supplement 12 to ITU-T H-series Recommendations Gateway control p
9、rotocol: Priority traffic treatment by ITU-T H.248 gateways Summary Supplement 12 to ITU-T H-series Recommendations provides complementary information on the handling of priority traffic (e.g., international emergency preference scheme (IEPS)/emergency telecommunications service (ETS) traffic) by th
10、e ITU-T H.248 entities: Media Gateway Controller (MGC) and Media Gateway (MG). This supplement illustrates the difficulty, even impossibility, of a generic specification i.e., a generic ITU-T H.248 profile, in justifying concrete, dedicated protocol solutions in the case of an available alternative
11、for “emulation approaches“. History Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T H Suppl. 12 2013-11-08 16 11.1002/1000/12068-en _ *To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID.
12、 For example, http:/handle.itu.int/11.1002/1000/11830-en. ii H series Supplement 12 (11/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunica
13、tion 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 worldwide basis. The World Telecommunication Standardization Assembly
14、(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 Resolution 1. In some areas of information technology which fa
15、ll within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this publ
16、ication is voluntary. However, the publication may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the publication is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “mu
17、st“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the publication is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this publication may inv
18、olve 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 the publication development process. As of the date of approval of this public
19、ation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. 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:/
20、www.itu.int/ITU-T/ipr/. ITU 2014 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. H series Supplement 12 (11/2013) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere
21、 2 3.2 Terms defined in this supplement . 2 4 Abbreviations and acronyms 3 5 Conventions 4 6 Priority traffic Traffic model and profile specifications 4 6.1 Traffic model 4 6.2 Conventions for abstracted ITU-T H.248 signalling specifications . 5 6.3 Specification plane: Type of ITU-T H.248 profile .
22、 5 6.4 Specification plane: Codepoint space . 9 6.5 Specification plane: Further comments 9 Appendix I ITU-T H.248 profiles and Context attributes for priority traffic handling 11 I.1 Status ITU-T H.248 profiles . 11 I.2 Discussion of the principal ITU-T H.248 signalling options . 11 I.3 IEPS/ETS tr
23、affic support: Signalling (Stage 3) solutions 13 Appendix II Potential use cases with IEPS call indicator support 14 II.1 Overview 14 II.2 Use case #A: support of multiple, different IP QoS architectures . 14 II.3 Use case #B: IP bearer connection traversing different IP QoS architectures 15 II.4 Us
24、e case #C: Priority treatment with more than 16 priority levels 16 II.5 Use case #D: Network monitoring of signalling traffic (here: ITU-T H.248) . 17 II.6 Use case #E: National regulations which mandate the use of both IEPS call and priority indicators 17 II.7 Use case #F: Heterogeneous vendor land
25、scape 17 II.8 Summary and conclusions 18 Appendix III Mapping function Examples 19 III.1 Examples of MGC- and MG-located mapping functions . 19 III.2 Complete view on the two mapping functions in series . 20 H series Supplement 12 (11/2013) 1 Supplement 12 to ITU-T H-series Recommendations Gateway c
26、ontrol protocol: Priority traffic treatment by ITU-T H.248 gateways 1 Scope This supplement provides complementary information concerning the handling of priority traffic by the ITU-T H.248 entities: media gateway controller (MGC) and media gateway (MG). The following aspects are covered within the
27、scope: the notion of “priority traffic“ from the perspective of the ITU-T H.248 gateway control interface (clause 6); a comprehensive traffic model for priority services (as introduced by ITU-T H.248.81) with focus on the MG (clause 6.1); the specification aspects of ITU-T H.248 profiles with respec
28、t to “generic“ and “practical“ profiles (clause 6.2); a status snapshot of some ITU-T H.248 profiles and Context attribute support for priority traffic handling (Appendix I); example use cases for different gateway types supporting priority traffic (such as with possible international emergency pref
29、erence scheme (IEPS) call indicator support) (Appendix II). This supplement illustrates the difficulty, even impossibility, of a generic specification, i.e., a generic ITU-T H.248 profile, in justifying concrete, dedicated protocol solutions in the case of an available alternative for “emulation app
30、roaches“. 2 References ITU-T E.106 Recommendation ITU-T E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster relief operations. ITU-T E.107 Recommendation ITU-T E.107 (2007), Emergency Telecommunications Service (ETS) and interconnection framework for national implementations
31、of ETS. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2005), Gateway control protocol: Version 3. ITU-T H.248.52 Recommendation ITU-T H.248.52 (2008), Gateway control protocol: QoS support packages. ITU-T H.248.54 Recommendation ITU-T H.248.54 (2007), Gateway control protocol: MPLS support package. IT
32、U-T H.248.56 Recommendation ITU-T H.248.56 (2007), Gateway control protocol: Packages for virtual private network support. ITU-T H.248.79 Recommendation ITU-T H.248.79 (2012), Gateway control protocol: Guidelines for packet-based streams. ITU-T H.248.81 Recommendation ITU-T H.248.81 (2011), Gateway
33、control protocol: Guidelines on the use of the international emergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles. 2 H series Supplement 12 (11/2013) ITU-T H.Sup.9 ITU-T H-series Recommendations Supplement 9 (2008), Gateway control protocol: Operation of H
34、.248 with H.225.0, SIP, and ISUP in support of emergency telecommunications service (ETS)/International emergency preference scheme (IEPS). ITU-T I.130 Recommendation ITU-T I.130 (1988), Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an
35、 ISDN. ITU-T Q.1950 Recommendation ITU-T Q.1950 (2002), Bearer independent call bearer control protocol. ITU-T Y.2111 Recommendation ITU-T Y.2111 (2011), Resource and admission control functions in next generation networks. ETSI TS 122 153 ETSI TS 122 153 (2012), Digital cellular telecommunications
36、system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Multimedia priority service (3GPP TS 22.153 version 11.1.0 Release 11). ETSI TS 129 238 ETSI TS 129 238, Universal Mobile Telecommunications System (UMTS); LTE; Interconnection Border Control Functions (IBCF) Transition Gatew
37、ay (TrGW) interface; Ix interface; Stage 3. ETSI TS 129 334 ETSI TS 129 334, Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IMS Application Level Gateway (IMS-ALG) IMS Access Gateway (IMS-AGW); Iq Interface; Stage 3. ETSI TS 183 018 ETS
38、I TS 183 018, Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control: H.248 Profile Version 3 for controlling Border Gateway Functions (BGF) in the Resource and Admission Control Subsystem (RACS); Protocol specification. 3 De
39、finitions 3.1 Terms defined elsewhere This supplement uses the following terms defined elsewhere: 3.1.1 emergency telecommunications service (ETS) ITU-T E.107: A national service providing priority telecommunications to the ETS authorized users in times of disaster and emergencies. 3.1.2 internation
40、al emergency preference scheme (IEPS) ITU-T E.106. 3.2 Terms defined in this supplement This supplement defines the following terms: 3.2.1 bearer-dependent decision point (BDDP): The media gateway controller (MGC) is the primary decision point with respect to the mapping of call control level inform
41、ation to gateway control signalling and the applicable ITU-T H.248 context, termination and/or stream entity as bearer level elements. The MGC provides all necessary information about bearer plane protocol stack, supported QoS technologies, etc. NOTE 1 This is the usual model in the master-slave rel
42、ationship of ITU-T H.248 gateways. NOTE 2 The synonym of technology-dependent / technology-independent originates from the ITU-T resource and admission control function (RACF) architecture (see ITU-T Y.2111). H series Supplement 12 (11/2013) 3 3.2.2 bearer-independent decision point (BIDP): In contr
43、ast to clause 3.2.1, definition of BDDP, the media gateway controller (MGC) is still the primary decision point with respect to the mapping of call control level information to gateway control signalling but lacks (partially or fully) bearer-related information. The MGC applies generic signalling an
44、d delegates the final mapping to the MG. NOTE The notion of bearer-independent originates from the bearer-independent call control (BICC) architecture (see ITU-T Q.19xx-series of Recommendation); applied, for example, in the ITU-T H.248 profile bearer-independent call bearer control protocol accordi
45、ng to ITU-T Q.1950. 3.2.3 mapping function (MF): A function, located in ITU-T H.248 entities (MGC and MG), for mapping protocol objects between two interfaces (MGC: between call control and gateway control signalling; MG: between gateway control signalling and user plane protocols). The mapping func
46、tion relates to the following, hierarchical information: MF type (a) Protocol mapping: e.g., ITU-T H.248, ITU-T H.323, session initiation protocol (SIP), Internet Protocol (IP); protocol type mapping: MGC level mapping: SIP to ITU-T H.248, SIP session description protocol (SDP) to ITU-T H.248 (SDP);
47、 and MG level mapping: ITU-T H 248 to IP); NOTE 1 The MGC located mapping function (MF MGC) could affect the two protocol levels (a1) application control protocol (e.g., ITU-T H.323, SIP or BICC) and an optional embedded (a2) media description protocol (e.g., SDP). MF type (b) Type mapping: Mapping
48、of information element types (e.g., signalling element type or IP header field); NOTE 2 At a syntactic level the mapping of information element types usually implies a mapping of the information element value. MF type (c) Value mapping: Mapping of information element value. NOTE 3 The combination of
49、 signalling element/type is also known as codepoint. The mapping function may affect all three levels in any combination. NOTE 4 Appendix III illustrates some examples of different mapping functions. 4 Abbreviations and acronyms This supplement uses the following abbreviations and acronyms: BD Bearer Dependent BI Bearer Independent BDDP Bearer-dependent Decision Point BICC Bearer-Independent Call Control BIDP
