1、 re International Telecommunication Union ITU-T Y.2254TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2014) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Next Generation Networks Service aspects: Interoperability of services and networks in N
2、GN Capabilities of multi-connection to support enhanced multimedia telephony services Recommendation ITU-T Y.2254 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, ap
3、plications and middleware 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
4、 applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport 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
5、Y.1800Y.1899 IPTV over NGN 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 ne
6、tworks in NGN Y.2250Y.2299Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y
7、.3000Y.3499 CLOUD COMPUTING Y.3500Y.3999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2254 (01/2014) i Recommendation ITU-T Y.2254 Capabilities of multi-connection to support enhanced multimedia telephony services Summary Recommendation ITU-T Y.2254 describes
8、requirements for network transport and service layer capabilities to support enhanced multimedia telephony (eMMTel) services over the multi-connection functional architecture. The capabilities of multi-connection to support the eMMTel services encompass, at least, the following functions, such as se
9、rvice control function, security and charging function, policy and transport function, as well as the corresponding information flows. History Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T Y.2254 2014-01-13 13 11.1002/1000/12074-en Keywords eMMTel service, multi-connection architec
10、ture, NGN. _ *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. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T Y.2254 (01/2014) FOREWORD The International Telecommunication Uni
11、on (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 questions a
12、nd 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 Recommendations on th
13、ese 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 Recommendation, the exp
14、ression “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 or applica
15、bility) 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 compliance with the
16、 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 applicabil
17、ity 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 not received notice of intellectual property, protected by patents, which may be required to implement
18、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 2014 All rights reserved. No part of this publication may be reproduced, by any means w
19、hatsoever, without the prior written permission of ITU. Rec. ITU-T Y.2254 (01/2014) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Description of service
20、features . 4 6.1 Service definition 4 6.2 Enriched call . 4 6.3 Enhanced file transfer . 4 6.4 Enhanced content sharing . 4 6.5 Enhanced messaging 5 7 Architecture of eMMTel over multi-connection 5 7.1 High level functions description . 6 7.2 Functional entities defined in the eMMTel service functio
21、n 6 8 Specific capabilities of multi-connection to support eMMTel . 7 8.1 Requirement for MAS-F . 7 8.2 Requirement for SCF 7 8.3 Requirement for MCF 7 8.4 Requirement for MMF . 8 8.5 Requirement for transport function (TF) 9 8.6 Requirement for MUE 9 9 Information flow . 10 9.1 Enriched call . 10 9
22、.2 Enhanced content sharing . 13 9.3 Enhanced file transfer . 15 9.4 Enhanced messaging 18 10 Charging consideration . 18 11 Security and privacy considerations . 19 11.1 Access security for the user-to-network interface (UNI) . 19 11.2 Security for the service . 19 11.3 Communication security . 20
23、11.4 Data confidentiality 20 11.5 Data integrity 20 Appendix I Scenarios for enhanced multimedia telephony services 21 I.1 Reliability and service continuity . 21 iv Rec. ITU-T Y.2254 (01/2014) Page I.2 Bandwidth aggregation . 21 I.3 Multiple UE receiving multimedia . 22 I.4 UE initiated network sel
24、ection . 23 I.5 Network initiated network selection . 23 I.6 Service transfer . 24 Bibliography. 25 Rec. ITU-T Y.2254 (01/2014) 1 Recommendation ITU-T Y.2254 Capabilities of multi-connection to support enhanced multimedia telephony services 1 Scope This Recommendation describes the capabilities of m
25、ulti-connection to support the enhanced multimedia telephony service (eMMTel). The scope of this Recommendation includes scenarios, service features, requirements, functional architecture, information flows and other aspects such as security and charging for eMMTel services over the multi-connection
26、 functional architecture. It is noted that eMMTel service in this Recommendation applies the IMS-based NGN environment. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the
27、 time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below
28、. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Q.1706 Recommendation ITU-T Q.1706/Y.2801 (2006), Mobility management requirements f
29、or NGN. ITU-T X.200 Recommendation ITU-T X.200 (1994) | ISO/IEC 7498-1:1994, Information technology Open Systems Interconnection Basic Reference Model: The basic model. ITU-T X.800 Recommendation ITU-T X.800 (1991), Security architecture for Open Systems Interconnection for CCITT applications. ITU-T
30、 Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. ITU-T Y.2027 Recommendation ITU-T Y.2027 (2012), Functional architecture of multi-connection. ITU-T Y.2233 Recommendation ITU-T Y.2233 (2008), Requirements and framework allowing accounting and charging capabilities in NGN. ITU-T Y
31、.2251 Recommendation ITU-T Y.2251 (2011), Multi-connection requirements. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 connection ITU-T X.200: A connection is an association established for the transfer of data between two or more pee
32、r-(N)-entities. This association binds the peer-(N)-entities together with the (N-1)-entities in the next lower layer. 3.1.2 confidentiality ITU-T X.800: The property that information is not made available or disclosed to unauthorized individuals, entities, or processes. 2 Rec. ITU-T Y.2254 (01/2014
33、) 3.1.3 data integrity ITU-T X.800: The property that data has not been altered or destroyed in an unauthorized manner. 3.1.4 denial of service ITU-T X.800: The prevention of authorized access to resources or the delaying of time-critical operations. 3.1.5 mobility ITU-T Q.1706: The ability for the
34、user or other mobile entities to communicate and access services irrespective of changes of the location or technical environment. 3.1.6 multi-connection ITU-T Y.2251: The functionality which provides capability to the user equipment (UE) and network to maintain more than one access network connecti
35、on simultaneously. NOTE 1 All connections are coordinated to provide service to higher layer entities. NOTE 2 In a multi-connection communications at least one UE is required to be a multi-connection UE. 3.1.7 next generation network (NGN) ITU-T Y.2001: A packet-based network able to provide telecom
36、munication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport related technologies. It enables unfettered access for users to networks and to competing service providers and/or servi
37、ces of their choice. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users. 3.1.8 offline charging ITU-T Y.2233: Charging mechanism where charging information does not affect, in real-time, the service rendered. 3.1.9 online charging ITU-T Y.2233:
38、 Charging mechanism where charging information can affect, in real-time, the service rendered and therefore a direct interaction of the charging mechanism with resource/session/service control is required. 3.1.10 threat ITU-T X.800: A potential violation of security. 3.2 Terms defined in this Recomm
39、endation This Recommendation defines the following term: 3.2.1 MC-eMMTel (eMMTel service over multi-connection): A service over multi-connection which provides real-time bidirectional conversational transfer of multiple media types (e.g., audio, video, data) between two or more terminals simultaneou
40、sly. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: 3G 3rd Generation AAA Authentication, Authorization, Accounting CDR Charging Data Record CS Circuit Switched eMMTel Enhanced Multimedia Telephony Services ID Identification IM Instant Messenger IM-FE
41、 Instant Message Functional Entity IMS IP Multimedia Subsystem IP Internet Protocol MAS-F Multi-connection Application Support Function Rec. ITU-T Y.2254 (01/2014) 3 MCF Multi-connection Control Function MC-FE Multi-connection Coordination Functional Entity MMF Multi-connection Media Function MMS Mu
42、ltimedia Messaging Service MMTel Multimedia Telephony Services MPC-FE Multi-connection Policy Control Functional Entity MR-FE Multi-connection Registration Functional Entity MSISDN Mobile Subscriber International ISDN/PSTN number MSRP Message Session Relay Protocol MT-FE Multimedia Telephony Functio
43、nal Entity MUE Multi-connection User Equipment MUP-FE Multi-connection User Profile Functional Entity NAB-FE Network Address Book Functional Entity OCS Online Charging System PR-FE Presence and Group Management Functional Entity PS Packet Switched QoS Quality of Service RTP Real-time Transport Proto
44、col SCF Service Control Function SDP Session Description Protocol SIP Session Initiation Protocol SMS Short Messaging Service SRTP Secure Real-time Transport Protocol TF Transport Function UE User Equipment UNI User-to-Network Interface VoIP Voice over Internet Protocol 5 Conventions In this Recomme
45、ndation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “is prohibited from“ indicate a requirement which must be strictly followed and from which no deviatio
46、n is permitted if conformance to this document is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus this requirement need not be present to claim conformance. 4 Rec. ITU-T Y.2254 (01/2014) The keywords “is not recommen
47、ded“ indicate a requirement which is not recommended but which is not specifically prohibited. Thus, conformance with this specification can still be claimed even if this requirement is present. The keywords “can optionally“ indicate an optional requirement which is permissible, without implying any
48、 sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it means the vendor may optionally provide the feature and still claim conformance with
49、the specification. 6 Description of service features 6.1 Service definition MMTel is a global standard based service on NGN/IMS, offering converged, fixed and mobile real-time multimedia communication using the media capabilities such as voice, real-time video, text, file transfer and sharing of pictures, audio and video clips. eMMTel is a set of mash-up services; it allows the combination of several services. eMMTel provides a new user exper
