1 An Enhancement of Mobile IP by Home Agent Handover Advisor : Chun-Chuan Yang Speaker : Li-Sheng Yu June 23, 2005 Reference: “An Enhancement of Mobile IP by Home Agent Handover,” Proceedings, IEEE 62 nd Semiannual Vehicular Technology Conference (VTC-2005Fall), Sept

2 Outline Introduction Home Agent Handover in Mobile IP (HH-MIP) HH-MIP Multicast Extension (HH-MIP/ME) Conclusion

3 Foreign Network (FN) Home Agent (HA) Foreign Agent (FA) Tunneling Correspondent Node (CN) Mobile Host (MH) Internet Mobile IP Data Delivery Home Network (HN) Conventional datagram Tunneled datagram Disadvantage : 1. Triangular Routing Problem 2. Long Handoff Delay

4 FN HA FA CN MH Internet Route Optimization (ROMIP) Protocol Overview HA oFA CN Internet nFA Disadvantage : Large Signaling Overhead Control packets nFA :new FA oFA :old FA

5 FN HA FA CN MH Internet HH-MIP Concept HN Is there possible to make HA always close to MH ? THA THA :Temporary Home Agent

6 Flow Diagram for Data Delivery in HH-MIP CNHATHAFA(MH) MWMW MRMR MUMU MAMA Control messages: M W = Binding Warning Message M R = Binding Request Message M U = Binding Update Message M A = Acknowledgement Message Conventional datagrams Tunneled datagrams SESSION

7 THA Selection in HH-MIP Initially HA is the MH’s THA HA FA1 FA2 MH If Distance (FA2, HA) < Distance (FA2, THA) then /*** MH is moving closer to its HA ***/ HA is selected as the new THA Else if Distance (FA2, THA) > Distance (FA1, THA) /*** MH is moving away from its previous THA ***/ FA2 is selected as its new THA Else MH’s THA remains the same THA

8 Flow Diagram for THA Handover CNHAold-THA Conventional datagrams Tunneled datagrams new-FA (MH) new-THA Movement & THA Handover old-FA Tunneled lost datagrams MUMU MUMU MWMW MRMR MUMU MAMA SESSION Control messages: M W = Binding Warning Message M R = Binding Request Message M U = Binding Update Message M A = Acknowledgement Message

9 HA FA1FA2FA3 Internet CN MH Dynamic Hierarchical Mobile IP (DHMIP) IEEE Journal on Selected Area in Communications, Volume: 22, Issue: 4, May 2004 Location registration Conventional datagram MH movement Tunneled datagram

10 Simulation Environment 8 x 8 Mesh Network CN MH Simulation Period : 500 time slots Move Probability : 0.2~0.9

11 Signaling Cost

12 Handoff Latency

13 End-to-End Path Length

14 HH-MIP/Multicast Extension (HH-MIP/ME) Related Work Protocol Overview Performance Evaluation

15 Related Work Multicast Sender MH1 FA1FA2 Multicast Sender MH1 MH2 FA1 HA1HA2 FA2   Tunneling Multicast Tree Link Join message delivery Remote SubscriptionBi-directional Tunneling MoM : an enhancement of Bi-directional Tunneling

16 HA FA MH1MH2MH3 Data Duplication and Tunnel Convergence Problem Internet Multicast Sender HA1HA3HA2 FA MH1MH2MH3 Data DuplicationTunnel Convergence Tunneling Multicast Tree Link

17 DMSP Handoff Multicast Sender MH1 MH2 FA1 HA1HA2 Multicast Sender MH1MH3 FA1 HA1HA2 FA2 MH2 MH3 HA3 DMSP

18 Multicast Sender MH1MH2MH3 FA1 HH-MIP/ME Data Delivery THA1 THA2THA3 FA2FA3 MH4 Multicast Sender MH2MH3 FA1 THA1 THA2THA3 FA2FA3 MH4MH1   THA1 = MH1,MH2 THA2 = MH3 THA3 = MH4

19 Multicast Sender MH1MH3 HH-MIP/ME During THA Handover FA1THA2FA3 THA1THA3    12 Tunneling Join message delivery Multicast Tree Link

20 Performance Evaluation 8 x 8 Mesh Network Multicast Sender MH Simulation Period : 500 time slot Move Probability : 0.2~0.9 Group Size : 10~50 MHs

21 End-to-End Path Length

22 Tree Maintenance Overhead

23 Number of DMSP Handoff

24 DMSP Handoff Latency

25 Conclusion HH-MIP uses THA to reduce : Triangular routing Handoff latency Signaling cost HH-MIP/ME : HH-MIP based Multicast Extension A hybrid of MoM and RS