1、 International Telecommunication Union ITU-T Y.2237TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2010) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Next Generation Networks Service aspects: Service capabilities and service architecture Fun
2、ctional model and service scenarios for QoS-enabled mobile VoIP service Recommendation ITU-T Y.2237 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
3、 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 applications
4、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 Y.1800Y.1899 I
5、PTV 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.2249Service aspects: Interoperability of services and networks in NGN Y
6、.2250Y.2299 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, ple
7、ase refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2237 (01/2010) i Recommendation ITU-T Y.2237 Functional model and service scenarios for QoS-enabled mobile VoIP service Summary Recommendation ITU-T Y.2237 introduces a functional model and service scenarios for QoS-enabled mobile VoIP ser
8、vice in WiFi, 3G, and mobile WiMAX networks. In this Recommendation, mobile VoIP service is assumed to be provided by application of Layer 2 authentication and make-before-break based service continuity in the transport stratum. The functional model used for the description of service scenarios prov
9、ided in this Recommendation is based on components and entities defined in Recommendation ITU-T Y.2012 covering user terminal, networks and media handling related aspects. History Edition Recommendation Approval Study Group 1.0 ITU-T Y.2237 2010-01-29 13 Keywords Mobile WiMAX, mobility, VoIP, WiFi,
10、3G. ii Rec. ITU-T Y.2237 (01/2010) FOREWORD The International Telecommunication 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
11、 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 (WTSA), which meets every four years, establishes the topic
12、s 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 fall within ITU-Ts purview, the necessary standards are prepa
13、red on a collaborative basis with ISO and IEC. NOTE In this Recommendation, 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
14、 contain certain mandatory provisions (to ensure e.g., interoperability 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 exp
15、ress 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 possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Pro
16、perty 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 Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice o
17、f intellectual property, protected by patents, which may be required to implement 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
18、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 Y.2237 (01/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2
19、 4 Abbreviations and acronyms 3 5 Conventions 4 6 Overview 4 7 Functional model 5 8 Key assumptions . 7 8.1 User terminal aspects 7 8.2 Networks aspects 7 8.3 Media handling aspects 8 8.4 End-to-end considerations 9 9 Security considerations . 9 Appendix I Service scenarios for providing QoS enabled
20、 mobile VoIP service 10 I.1 User terminal moving in a single operators network . 10 I.2 Interworking between different operators networks 15 I.3 User terminal moving between different access networks within the same operators network 19 Appendix II Mapping between functions defined in NGN and 3GPP,
21、Mobile WiMAX, WiFi entities . 23 II.1 Mapping of 3GPP entities to NGN functional entities . 23 II.2 Mapping of mobile WiMAX entities to NGN functional entities 25 II.3 Mapping of WiFi entities to NGN functional entities 25 Bibliography. 26 Rec. ITU-T Y.2237 (01/2010) 1 Recommendation ITU-T Y.2237 Fu
22、nctional model and service scenarios for QoS-enabled mobile VoIP service 1 Scope This Recommendation introduces a functional model and service scenarios related to the support of QoS-enabled mobile voice over IP (VoIP) service in WiFi, 3G, and mobile WiMAX networks. More specifically, this Recommend
23、ation provides a description of: a functional model applicable to the context of QoS-enabled mobile VoIP service; service scenarios related to the provision of QoS-enabled mobile VoIP service: in a single operators network which supports either WiFi, 3G or mobile WiMAX; in multiple operators network
24、s, each supporting a different wireless network, e.g., a WiFi, mobile WiMAX or 3G wireless network; in a single operators network where the user terminal moves between different wireless access networks. 2 References The following ITU-T Recommendations and other references contain provisions which,
25、through reference in this text, constitute provisions of this Recommendation. At the 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 apply
26、ing the most recent edition of the Recommendations and other references listed below. 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
27、Q.1706 Recommendation ITU-T Q.1706/Y.2801 (2006), Mobility management requirements for NGN. ITU-T Q.1707 Recommendation ITU-T Q.1707/Y.2804 (2008), Generic framework of mobility management for next generation networks. ITU-T Q.1708 Recommendation ITU-T Q.1708/Y.2805 (2008), Framework of location man
28、agement for NGN. ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2006), Functional requirements and architecture of the NGN. ITU-T Y.2014 Recommendation ITU-T Y.2014 (2008), Network attachment control functions in next generation ne
29、tworks. ITU-T Y.2018 Recommendation ITU-T Y.2018 (2009), Mobility management and control framework and architecture within the NGN transport stratum. ITU-T Y.2111 Recommendation ITU-T Y.2111 (2008), Resource and admission control functions in next generation networks. ITU-T Y.2201 Recommendation ITU
30、-T Y.2201 (2009), Requirements and capabilities for ITU-T NGN. ITU-T Y.2701 Recommendation ITU-T Y.2701 (2007), Security requirements for NGN release 1. 2 Rec. ITU-T Y.2237 (01/2010) ITU-T Y.2702 Recommendation ITU-T Y.2702 (2008), Authentication and authorization requirements for NGN release 1. 3 D
31、efinitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 functional entity ITU-T Y.2012: An entity that comprises an indivisible set of specific functions. Functional entities are logical concepts, while groupings of functional entities are used to
32、 describe practical, physical implementations. 3.1.2 functional model b-ITU-R M.1224: A model which identifies and defines functional entities and relationships between these functional entities. 3.1.3 host-based mobility ITU-T Y.2018: A mode of operation whereby the mobile UE takes an active role i
33、n the provision of mobility service at layer 3, in particular by contacting the mobile service provider directly to invoke this service after gaining network access. 3.1.4 location identifier (LID) ITU-T Q.1707: A topological location identifier of a user equipment (UE). An IP address can be used as
34、 a location identifier. 3.1.5 network-based mobility ITU-T Y.2018: A mode of operation whereby the mobile UE does not take an active role in the provision of mobility service at layer 3. 3.1.6 persistent location identifier (PLID) ITU-T Q.1708: A location identifier that does not change even when a
35、mobile user equipment (MUE) moves across different access networks or IP subnets. 3.1.7 seamless service ITU-T Q.1706: A service that is implemented such that it will ensure that users will not experience any service disruptions while changing the point of attachment. 3.1.8 service continuity ITU-T
36、Q.1706: The ability for a moving object to maintain ongoing service over including current states, such as users network environment and session for a service. 3.1.9 temporary location identifier (TLID) ITU-T Q.1708: A location identifier that changes when a mobile user equipment (MUE) moves across
37、different access networks or IP subnets. 3.1.10 terminal mobility ITU-T Q.1706: This is the mobility for those scenarios where the same terminal equipment is moving or is used at different locations. The ability of a terminal to access telecommunication services from different locations and while in
38、 motion, and the capability of the network to identify and locate that terminal. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 persistent IP address: An IP address that does not change even when a user equipment moves across different access networks
39、 or IP subnets. NOTE A persistent IP address can be used as a persistent location identifier; see clause 3.1.6. 3.2.2 temporary IP address: An IP address that changes when a user equipment moves across different access networks or IP subnets. NOTE A temporary IP address can be used as a temporary lo
40、cation identifier; see clause 3.1.9. Rec. ITU-T Y.2237 (01/2010) 3 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: 3G Third Generation wireless system AAA Authentication Authorization Accounting ABG-FE Access Border Gateway Functional Entity AM-FE Acce
41、ss Management Functional Entity AN-FE Access Node Functional Entity AR-FE Access Relay Functional Entity AP Access Point BSC Base Station Controller CSCF Call Session Control Function DNS Domain Name Server EN-FE Edge Node Functional Entity FRA Functional Requirements and Architecture HA Home Agent
42、HDC-FE Handover Decision and Control Functional Entity HSS Home Subscriber Server IBG-FE Interconnection Border Gateway Functional Entity I-CSC-FE Interrogating-Call Session Control Functional Entity IMS IP Multimedia Subsystem IP Internet Protocol L2 Layer 2 L2HEF Layer 2 Handover Execution Functio
43、n L3 Layer 3 L3HEF Layer 3 Handover Execution Function MAC Media Access Control MLM-FE Mobile Location Management Functional Entity MMCF Mobility Management and Control Functions NACF Network Attachment Control Functions NAC-FE Network Access Configuration Functional Entity OUT Originating User Term
44、inal P-CSCF Proxy-Call Session Control Function P-CSC-FE Proxy Call Session Control Functional Entity PDA Personal Digital Assistant PD-FE Policy Decision Functional Entity QoS Quality of Service RACF Resource and Admission Control Functions 4 Rec. ITU-T Y.2237 (01/2010) RAS Radio Access Station SAA
45、-FE Service Authentication and Authorization Functional Entity S-CSC-FE Serving-Call Session Control Functional Entity SCF Service Control Functions SIP Session Initiation Protocol SL-FE Subscription Locator Functional Entity SUP-FE Service User Profile Functional Entity TAA-FE Transport Authenticat
46、ion and Authorization Functional Entity TRC-FE Transport Resource Control Functional Entity TUT Terminating User Terminal UT User Terminal VoIP Voice over Internet Protocol WiFi Wireless Fidelity WiMAX Worldwide interoperability for Microwave Access WLAN Wireless Local Area Network 5 Conventions Non
47、e. 6 Overview In this Recommendation, mobile voice over IP service is assumed to be a seamless service as defined in clause 3.1.7, i.e., a VoIP service that is implemented such that it will ensure that mobile users will not experience any service disruptions while changing the point of attachment. M
48、obile VoIP service requires the support of service continuity for terminal mobility taking into account network conditions (e.g., the number of user sessions, mobility events and bandwidth consumption) and users requirements. QoS enabled mobile VoIP service is a mobile VoIP service which has the cha
49、racteristic of ensuring the QoS when the user terminal moves, e.g., changes from one access point to another one. This service requires some form of adaptation in order to support service continuity when users requirements and network conditions mismatch. Adaptation may include negotiation/renegotiation of network QoS and/or terminal parameters (e.g., codec change/adaptation). When the user terminal moves between different networks, network QoS parameters may either be mainta
