1. Handoff In All IP Networks Shinhyun Yang yangsh@hei.co.kr Hyundai Electronics Industry Co., Ltd. 2000. 5. 18 ~ 5. 19

2. 3G System Lab. 1 Overview of All IP  Characteristics of All IP Network äMove IP as close to the Air network as possible (e.g. BTS). äMake the radio access network simply another link layer äReuse of existing IP protocols and Applications äProvide a handoff mechanism that equals to or exceeds current cellular performance, and works for both voice and data.  Main Issues of All IP Network äMobility Management Model äCall Control Model äAddressing and Naming, and etc.

3. 3G System Lab. 2 Overview of Mobility Management  Importance of Mobility Management äOne of the most important function in Mobile Communication äPure IP protocol have never considered it. äQuality of Handoff is most important factor for Service Provider and User, where Handoff can be supported by Mobility Management functionality.  Hierarchical Mobility Management äMacro Mobility äMicro Mobility

4. 3G System Lab. 3 Handoff requirements in All IP Network From Lucent’s contribution in April (ALLIP-20000426-014_LT-Reqts_Sect_6.3.doc)

5. 3G System Lab. 4 Handoff in All IP Network  General Requirements for H/O Scheme älow latency äno data loss äscalability to a large internetwork  All IP specific Issues äspeedy resource reservation on IP. äreducing HA and FA overhead äsoft H/O scheme

6. 3G System Lab. 5  Mobile IP äProvides the “macro” mobility äTriangular routing and tunneling management problem 3The Route Optimization provides the framework needed for fast handoff but still remain long latency problem : data loss might be occurred in inter-FA registration process 3arise HA and FA bottleneck problem  Cellular IP äSolves the “micro” mobility äMinimize packet losses and degradation of QoS during handoff äInterwork with Mobile IP to support wide area mobility Handoff in All IP Network (Cont.)

7. 3G System Lab. 6  Hierarchical Mobility management äHierarchical FAs : a domain FA and one or more subnet FAs äReduces handoff latency and the load on the internetwork  Hierarchical MM with Pre-resource Allocation scheme äResource consuming  Mobile IP with SIP äShorter path than only Mobile IP äDHCP address allocation (similar latency with Mobile IP) Handoff in All IP Network (Cont.)

8. 3G System Lab. 7 Conclusion  To reduce handoff latency, hierarchical FA architecture can be acceptable (e.g. regional registration) äIt also can be the way to reduce HA or FA overload  To reduce data losses, Soft H/O or retransmission buffer scheme is required äTo support Soft H/O, modified wireless layer 2 protocol or enhanced PPP is required  To support scalability to a large internetwork, mixture protocol with Mobile IP can be a promising solution.