1、 International Telecommunication Union ITU-T Q.1707/Y.2804TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2008) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements and protocols for IMT-2000 SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORK
2、S Next Generation Networks Generalized mobility Generic framework of mobility management for next generation networks Recommendation ITU-T Q.1707/Y.2804 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTO
3、MATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICAT
4、IONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000
5、 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Q.1707/Y.2804 (02/20
6、08) i Recommendation ITU-T Q.1707/Y.2804 Generic framework of mobility management for next generation networks Summary Recommendation ITU-T Q.1707/Y.2804 describes a generic framework of mobility management for next generation networks. This Recommendation describes the design considerations, concep
7、tual framework, functional architecture, and high-level information flows for mobility management in the NGN. Source Recommendation ITU-T Q.1707/Y.2804 was approved on 29 February 2008 by ITU-T Study Group 19 (2005-2008) under Recommendation ITU-T A.8 procedure. Keywords Framework, handover control,
8、 location management, mobility management, NGN. ii Rec. ITU-T Q.1707/Y.2804 (02/2008) 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 Sta
9、ndardization 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 (WTSA),
10、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 fall withi
11、n 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 administration and a recognized operating agency. Compliance with this Recommend
12、ation 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 are met. The words “shall“ or some other obligatory language such as “
13、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 possibility that the practice or implementation of this Recommendation
14、 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 the Recommendation development process. As of the date of approval of
15、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 information and are therefore strongly urged to consult the TSB patent d
16、atabase at http:/www.itu.int/ITU-T/ipr/. ITU 2009 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 Q.1707/Y.2804 (02/2008) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations a
17、nd acronyms 2 5 Design considerations. 4 5.1 Network environments . 4 5.2 Design principles 4 6 Conceptual framework of MM . 6 6.1 MM control function 6 6.2 Types of MM in NGN 6 6.3 MM identifiers 7 6.4 Location management 8 6.5 Handover control 8 7 MM functional architecture 8 7.1 Mobility manageme
18、nt control function (MMCF) 8 7.2 Location management function (LMF) 12 7.3 Handover control function (HCF) 13 7.4 Relationship between MMCF and NGN-FRA functions . 14 8 High-level information flows . 15 8.1 Network attachment 15 8.2 Location registration and update 15 8.3 Location query for user dat
19、a transport 17 8.4 Handover support . 20 Bibliography. 24 iv Rec. ITU-T Q.1707/Y.2804 (02/2008) Introduction This Recommendation describes a framework of mobility management (MM) for next generation networks (NGN). This work has been motivated from the observation that NGN continues to evolve toward
20、 the convergence of fixed and wireless/mobile networks, and thus the MM is an essential functionality to provide seamless mobility for the NGN users and services. This Recommendation is a part of the MM framework for NGN. The MM framework is designed with a couple of Recommendations, rather than a s
21、ingle Recommendation, as a suite of the framework of MM for NGN. This is because the design of the MM framework includes a variety of technical issues to be addressed. Furthermore, those design issues are associated with a wide variety of mobility scenarios and protocols. In this respect, the MM fra
22、mework for NGN is described with a family of the following Recommendations: Recommendation ITU-T Q.1707/Y.2804: Generic framework of mobility management for NGN; Recommendation ITU-T Q.1708/Y.2805: Framework of location management for NGN; and Recommendation ITU-T Q.1709/Y.2806: Framework of handove
23、r control for NGN. Rec. ITU-T Q.1707/Y.2804 (02/2008) 1 Recommendation ITU-T Q.1707/Y.2804 Generic framework of mobility management for next generation networks 1 Scope The purpose of this Recommendation is to describe a generic framework of mobility management (MM) for next generation networks (NGN
24、s), which will include: Design issues common to both location management and handover control; Functional architecture for mobility management in the NGN perspective; High-level information flows for mobility management. It is noted that there are a variety of mobility types such as terminal mobilit
25、y, network mobility, services mobility, etc. This Recommendation focuses on the terminal mobility in the IP or higher layer among those MM types. MM schemes associated with a specific link-layer or lower-layer technology might be applied to the functions described in this Recommendation. However, th
26、e access-technology specific details are outside the scope of this Recommendation. This Recommendation describes a two-level architecture for MM functionality. For a scalability enhancement of MM in the NGN, the functional architecture can be extended to the architecture with more than two levels. T
27、his Recommendation also describes a high-level relationship between the MM control functions and the other functions defined in the NGN-FRA Release 1 so as to provide a guideline for further work on adding MM control functions to the NGN-FRA architecture. 2 References The following ITU-T Recommendat
28、ions and other references contain provisions which, 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 therefor
29、e encouraged to investigate the possibility of applying 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-al
30、one document, the status of a Recommendation. ITU-T Q.1706 Recommendation ITU-T Q.1706/Y.2801 (2006), Mobility management requirements for NGN. ITU-T Q.1708 Recommendation ITU-T Q.1708/Y.2805 (2008), Framework of location management for NGN. ITU-T Q.1709 Recommendation ITU-T Q.1709/Y.2806 (2008), Fr
31、amework of handover control for NGN. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2006), Functional requirements and architecture of the NGN release 1. ITU-T Y.2091 Recommendation ITU-T Y.2091 (2008), Terms and definitions for Next Generation Networks. 2 Rec. ITU-T Q.1707/Y.2804 (02/2008) 3 Definitions
32、 This Recommendation uses the definitions and terms that have been described in ITU-T Q.1706. In addition, this Recommendation uses the following terms: 3.1 access network: A network that is characterized by a specific wired/wireless access technology. Refer also to b-ITU-T Q.1742.2. 3.2 core networ
33、k: An architectural term related to the part of an NGN network, which is independent of a specific-access technology. Refer also to b-ITU-T Q.1741.2. 3.3 host-based mobility management: A mobility management scheme in which the MM signalling is performed based on (or controlled by) the user equipmen
34、t (UE). 3.4 network-based mobility management: A mobility management scheme in which the MM signalling is performed (or controlled) by the network entities, on behalf of the UE. 3.5 home network: The network (or service provider) to which a user has subscribed. The users subscription information is
35、managed in the home network. Refer also to ITU-T Q.1706. 3.6 visited network: The network (or service provider) outside the home network. Refer also to ITU-T Q.1706. 3.7 user identifier: A series of digits, characters and symbols or any other form of data that are used to identify a subscriber (user
36、) or user equipment in the NGN. Refer also to ITU-T Y.2091. 3.8 location identifier: A topological location identifier of a UE. An IP address can be used as a location identifier. Refer also to ITU-T Y.2091. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations: AAA Authe
37、ntication, Authorization, and Accounting A-HCF Access HCF A-LMF Access LMF A-MMCF Access MMCF AN Access Network AP Access Point AR Access Router BS Base Station BWA Broadband Wireless Access CDMA Code Division Multiple Access C-HCF Central HCF C-LMF Central LMF C-MMCF Central MMCF CN Core Network DH
38、CP Dynamic Host Configuration Protocol FA Foreign Agent FE Functional Entity Rec. ITU-T Q.1707/Y.2804 (02/2008) 3 HA Home Agent HC Handover Control HCF Handover Control Function ID Identifier IPSec IP Security Protocol IMS IP Multimedia Subsystem IP Internet Protocol L2 Layer 2 LID Location Identifi
39、er LM Location Management LMA Localized Mobility Agent LMF Location Management Function LTE Long Term Evolution MAG Mobile Access Gateway MIH Media Independent Handover MIP Mobile IP MM Mobility Management MMCF Mobility Management Control Function NAI Network Access Identifier NACF Network Attachmen
40、t Control Function NGN Next Generation Network NGN-FRA Functional Requirements and Architecture for NGN PMIP Proxy MIP PoA Point of Attachment PSTN Public Switched Telephone Network QoS Quality of Service RADIUS Remote Authentication Dial-In User Services SIP Session Initiation Protocol SSID Service
41、 Set ID UE User Equipment UID User Identifier URI Uniform Resource Identifier VoIP Voice over Internet Protocol W-CDMA Wideband-Code Division Multiple Access WLAN Wireless Local Area Network WPAN Wireless Personal Area Network 4 Rec. ITU-T Q.1707/Y.2804 (02/2008) 5 Design considerations 5.1 Network
42、environments The network environments in NGN can be illustrated as in Figure 5-1. As shown in the figure, the MM framework will be designed to support the mobility for NGN users across a wide variety of heterogeneous access networks. Figure 5-1 NGN environments From the NGN point of view, the MM fra
43、mework will be designed to provide a set of the signalling and control operations for MM. Those signalling and control operations will be performed among a variety of MM-related functional entities. In NGN, an operator may implement those MM-related functions in the core network (CN) and a variety o
44、f its access networks (ANs). With the help of the appropriate signalling operations for MM, an NGN user could benefit from the continuation of the services in the seamless manner, while it moves around the various access networks in NGN. 5.2 Design principles In this Recommendation, the MM framework
45、 will be designed with the following principles. 5.2.1 IP-based MM framework One of the major requirements for MM in NGN is that the MM schemes can operate over the IP-based networks, so as to support the mobility across a variety of heterogeneous access networks in NGN. The IP-based framework will
46、ensure that the MM functionality could be commonly applied to the various networks or systems, independently of the underlying link-layer access technologies. The IP-based MM framework will also facilitate that a variety of the well-defined existing IP-based protocols, such as AAA and DHCP, could be
47、 reused to support the MM. 5.2.2 Separation of MM control function from transport function It is noted that MM functionality can be viewed as the transport control function, rather than the transport function. MM control function will be designed as a self-contained scheme, not depending on the spec
48、ific data transport scheme. This feature will make it easier to implement and deploy the MM control functions to a variety of transport networks in NGN. Rec. ITU-T Q.1707/Y.2804 (02/2008) 5 5.2.3 Location management and handover control functions The MM framework is designed to provide the location
49、management (LM) functionality. For this purpose, the latest information of the location of a mobile user will be registered and updated, each time it continues to move around in the network. The MM framework is also designed to provide the handover control (HC) functionality. With the help of this HC function, a mobile UE can seamlessly continue the data communication during the session, even though it changes the associated IP address in the network. 5.2.4 Separation of user ID and location ID In the MM framework, user ID (a.k.
