1、 International Telecommunication Union ITU-T Q.1709/Y.2806TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2008) 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 Framework of handover control for NGN Recommendation ITU-T Q.1709/Y.2806 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS
3、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 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7
4、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 Q.1700Q.1799 SPECIFICATIONS OF
5、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.1709/Y.2806 (10/2008) i Recommendation ITU-T Q.170
6、9/Y.2806 Framework of handover control for NGN Summary Recommendation ITU-T Q.1709/Y.2806 specifies the framework of handover control for next generation networks. The handover control functionality is responsible for providing seamless services for mobile users by minimizing service disruptions dur
7、ing handover. The handover control schemes are classified into the host-based and network-based schemes. This Recommendation describes the design considerations, functional architecture and information flows for handover control. Source Recommendation ITU-T Q.1709/Y.2806 was approved on 14 October 2
8、008 by ITU-T Study Group 19 (2005-2008) under Recommendation ITU-T A.8 procedure. Keywords Handover control, mobility management, NGN. ii Rec. ITU-T Q.1709/Y.2806 (10/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunica
9、tions, 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 and issuing Recommendations on them with a view to standardizing telecommunicati
10、ons 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 these topics. The approval of ITU-T Recommendations is covered by the procedure l
11、aid 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 expression “Administration“ is used for conciseness to indicate both a telecommuni
12、cation 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 applicability) and compliance with the Recommendation is achieved when all of these mand
13、atory 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 Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws
14、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 applicability of claimed Intellectual Property Rights, whether asserted by ITU members or o
15、thers 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 this Recommendation. However, implementers are cautioned that this may not repres
16、ent the latest information and are therefore strongly urged to consult the TSB patent database 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.1709/Y.2806
17、(10/2008) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined in ITU-T Q.1707 2 3.2 Terms defined in ITU-T Q.1708 2 3.3 Terms defined in this Recommendation. 2 4 Abbreviations 2 5 Design considerations. 4 5.1 Handover and seamless handover 4 5.2 Handover operations. 5 5.3 O
18、perations for handover optimization 5 5.4 Host-based and network-based handover control. 6 6 Functional reference architecture . 6 6.1 Functional entities 6 6.2 Reference points . 8 7 Information flows for host-based handover control . 9 7.1 Generic host-based handover control . 9 7.2 Handover contr
19、ol based on handover tunnel 12 8 Information flows for network-based handover control. 13 8.1 Handover control based on LBU operation 13 8.2 Handover control based on LBU notification 16 9 Further considerations on handover control . 18 9.1 Vertical handover . 18 9.2 Inter-CN handover 19 Appendix I
20、Practical scenarios for seamless handover using MIH 20 I.1 Seamless real-time services with MIH. 20 I.2 MIP-based handover based on MIH. 21 Appendix II Advanced issues for handover control 24 II.1 Authentication procedure for fast handover. 24 II.2 Policy-based handover control . 27 II.3 Fast handov
21、er control for multi-interfaced MUE. 27 Bibliography 31 iv Rec. ITU-T Q.1709/Y.2806 (10/2008) Introduction This Recommendation describes a framework of handover control (HC) for mobility management (MM) in next generation networks (NGN). This work has been motivated from the observation that NGN con
22、tinues to evolve toward the convergence of fixed and wireless/mobile networks, and thus the mobility management is an essential functionality to provide seamless services to NGN users. This Recommendation is a part of the MM framework for NGN. The MM framework for NGN will be designed as a series of
23、 Recommendations rather than a single Recommendation. 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 framework for
24、NGN will be described within the following family of Recommendations: Recommendation ITU-T Q.1707/Y.2804: Generic framework of mobility management for next generation networks; Recommendation ITU-T Q.1708/Y.2805: Framework of location management for NGN; Recommendation ITU-T Q.1709/Y.2806: Framework
25、 of handover control for NGN. Rec. ITU-T Q.1709/Y.2806 (10/2008) 1 Recommendation ITU-T Q.1709/Y.2806 Framework of handover control for NGN 1 Scope This Recommendation describes the framework of IP-based handover control (HC) for NGN, which includes design considerations, functional architecture, an
26、d procedural information flows for handover control. This Recommendation focuses on the terminal mobility where mobile terminals move around and change their IP address in the NGN. This Recommendation also focuses on the mobility management (MM) schemes that operate in the network layer (or IP layer
27、), whereas the issues on the mobility support in the service stratum will be addressed in another ITU-T MM Framework Recommendation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommend
28、ation. 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 applying the most recent edition of the Recommendations and other references
29、 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 Q.1706 Recommendation ITU-T Q.1706/Y.2801 (2006), Mobility management r
30、equirements 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 management for NGN. ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), Gener
31、al overview of NGN. ITU-T Y.2011 Recommendation ITU-T Y.2011 (2004), General principles and general reference model for next generation networks. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2006), Functional requirements and architecture of the NGN release 1. ITU-T Y.2014 Recommendation ITU-T Y.2014 (
32、2008), Network attachment control functions in next generation networks. ITU-T Y.2091 Recommendation ITU-T Y.2091 (2007), Terms and definitions for next generation networks. ITU-T Y.2111 Recommendation ITU-T Y.2111 (2006), Resource and admission control functions in next generation networks. 2 Rec.
33、ITU-T Q.1709/Y.2806 (10/2008) 3 Definitions 3.1 Terms defined in ITU-T Q.1707 This Recommendation uses the following terms defined in ITU-T Q.1707: 3.1.1 location identifier (LID): A topological location identifier of a UE. An IP address can be used as a location identifier. Refer also to ITU-T Y.20
34、91. 3.1.2 user identifier (UID): A series of digits, characters and symbols or any other form of data that are used to identify a subscriber (user) or user equipment in the NGN. Refer also to ITU-T Y.2091. 3.2 Terms defined in ITU-T Q.1708 This Recommendation uses the following terms defined in ITU-
35、T Q.1708: 3.2.1 LID binding update (LBU): An operation of location management to manage the mapping between persistent LIDs (PLIDs) and temporary LIDs (TLIDs). 3.2.2 persistent LID (PLID): A LID that does not change even when an MUE moves across different access networks or IP subnets. 3.2.3 tempora
36、ry LID (TLID): A LID that changes when an MUE moves across different access networks or IP subnets. 3.3 Terms defined in this Recommendation This Recommendation defines the following term: 3.3.1 LID binding query (LBQ): An operation performed by a correspondent UE or network to find the current TLID
37、 of a mobile UE. 4 Abbreviations This Recommendation uses the following abbreviations: 2G 2nd Generation 3G 3rd Generation 3GPP 3rd Generation Partnership Project A-MMCF Access MMCF AAA Authentication, Authorization, and Accounting AHC-FE Access HC-FE ALM-FE Access LM-FE AP Access Point C-MMCF Centr
38、al MMCF CHC-FE Central HC-FE CLM-FE Central LM-FE CN Core Network CPE Customer Premises Equipment CPE-BE CPE-Border Element CS Command Service Rec. ITU-T Q.1709/Y.2806 (10/2008) 3 CUE Correspondent UE ES Event Service FE Functional Entity FMIP Fast handover for MIP GPS Global Positioning System HC H
39、andover Control HCF Handover Control Function ID Identifier IMSI International Mobile Station Identity IP Internet Protocol IPTV IP TeleVision IS Information Service ISP Internet Service Provider LBQ LID Binding Query LBU LID Binding Update LID Location ID LM Location Management LM-FE Location Manag
40、ement Functional Entity LMF Location Management Function LTE Long Term Evolution MIH Media Independent Handover MIHF MIH Function MIMO Multiple-Input Multiple-Output MIP Mobile IP MIPSHOP MIPv6 Signalling and Handoff Optimization MM Mobility Management MMCF Mobility Management Control Function MUE M
41、obile User Equipment NACF Network Attachment Control Function NGN Next Generation Network OFDM Orthogonal Frequency Division Multiplexing PD-FE Policy Decision-FE PE-FE Policy Enforcement-FE PLID Persistent LID PoA Point of Attachment QoS Quality of Service RACF Resource Admission Control Function 4
42、 Rec. ITU-T Q.1709/Y.2806 (10/2008) RF Radio Frequency TCP Transmission Control Protocol TLID Temporary LID UDP User Datagram Protocol UE User Equipment UID User Identifier VoD Video on Demand VoIP Voice over IP WiMAX Worldwide Interoperability for Microwave Access WLAN Wireless Local Area Network 5
43、 Design considerations This Recommendation describes the framework of handover control (HC) for NGN. The goal of the HC functionality is to provide a mobile user equipment (MUE) with seamless services whenever it moves around in NGNs. For this purpose, the seamless handover should be supported for t
44、he MUE, through which any ongoing session or services can continue without service disruption, regardless of the change of location ID (LID). As described in ITU-T Q.1708, MM identifiers are divided into user ID (UID) and location ID (LID). The LID is further classified into persistent LID (PLID) an
45、d temporary LID (TLID). This Recommendation focuses only on the case in which IP addresses are used as LID. The UID binding operation is responsible for mapping between UID and PLID, whereas the LID binding operation is used to map between PLID and TLID. The LID binding operation is realized through
46、 the LID binding update (LBU) operation. It is noted that the LBU operation is performed for LM as well as for HC. The LBU operation itself will be performed by LM functional entities (LM-FEs) with the help of HC functional entities (HC-FEs). This Recommendation will focus on the LBU operation from
47、the viewpoint of HC functionality. By moving into a new IP subnet, which is called a layer 3 (L3) handover, an MUE changes its TLID. The configuration of the TLID will be performed differently depending on whether the HC is host-based or network-based. The LID binding information shall be updated wi
48、th the new TLID by the LBU operation. 5.1 Handover and seamless handover The L3 handover occurs when an MUE changes its IP address (i.e., TLID) by moving between different IP subnets. This Recommendation focuses on IP handover or L3 handover. It is noted that L3 handover also accompanies layer 2 (L2
49、) handover. The HC operations can be further classified into those for handover and seamless (or fast) handover, as described in clause 6.2.2 of ITU-T Q.1706. For the handover operations, when an MUE moves into a new IP subnet and thus gets a new TLID, the LBU operation will be performed. In the LBU operation, the information of mapping between PLID and TLID will be updated by interworking among suitable LM-FEs and HC-FEs. The seamless (or fast) handover operation will be performed to minimize the service disruption during
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