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Cellular IP: A New Approach to Internet Host Mobility

Cellular IP: A New Approach to Internet Host Mobility. Reporter ：江俊毅. Outline. Cellular IP introduction Routing Protocol Paging Paging & Routing caches Handoff Conclusion. Introduction. Mobility overview Macro-mobility Mobile IP MIPV6 MIPV4 Micro-mobility Cellular IP HAWAII HIP.

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Cellular IP: A New Approach to Internet Host Mobility

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  1. Cellular IP:A New Approach to Internet Host Mobility Reporter：江俊毅

  2. Outline • Cellular IP introduction • Routing Protocol • Paging • Paging & Routing caches • Handoff • Conclusion

  3. Introduction • Mobility overview • Macro-mobility • Mobile IP • MIPV6 • MIPV4 • Micro-mobility • Cellular IP • HAWAII • HIP

  4. Cellular IP • Cellular IP represents a new mobile host protocol • simple, and flexible protocol for highly mobile hosts • CIP supports local mobility & efficiently internet works with Mobile IP

  5. Wirelss access networks and mobile IP

  6. G C E A Gateway Internet with Mobile IP F R R Beacon signal MH Home agent of MH Wireless Access network Model D B

  7. Packets will be first routed to the host's home agent and then tunneled to the gateway Packets transmitted by mobile hosts are first routed to the gateway and from there on to the Internet MOBILE IP The gateway "detunnels'' packets and forwards them toward base stations CELLULAR IP

  8. Cellular IP Paging • Idle mobile hosts that receive a packet move from idle to active state, start their active-state-timer and immediately transmit a route-update packet. • This ensures that routing cache mappings are established quickly

  9. Mobile host state machine

  10. PC RC 1 2 3 4 Mobile Host X X X Service Area Efficient Location Management PAGING & ROUTING Two parallel structures of mappings (PC &RC) 1 - idle MH keeps PC upto-date 2 - PC mappings used to find the loc of idle MH 3 - maintains RC mappings until actively connected 4 - routing of data packets to MH

  11. X : from C X : from G Internet with E G Mobile IP GW C Paging-update D A X F R B MH Illustration of Paging I don’t have a PC Paging-update packets create mappings in PCs

  12. X : from C X : from G Internet with E Mobile IP G G times out GW C D A X F R B MH PCs updated for a moving host No change in PC at A X : from F X : from F,G

  13. X : from C Internet with X : from F Mobile IP GW E G C D A F R B X MH Paging packets are routed to the mobile host by PCs X

  14. X : from F X : from C X : from E Internet with Mobile IP E G GW C D A X F R B Handoff X : from D X : from D, E

  15. Paging & Routing caches

  16. Handoff • Cellular IP handoff • Hard handoff • Semi-soft handoff • Hard handoff • During the Handoff Latency the downlink packets are lost. • Semi-soft handoff • Improvement over Hard Handoff

  17. Hard-Handoff 1.MN From Old BS to New BS 2.MN send Route Update Packet to GW 3.BSs are refresh RS 4.GW send data packets to MN

  18. Semi soft-Handoff • Improvement over Hard Handoff ; NO packet loss & smooth handoff. • Need for buffering at the cross over point :For smooth handoff

  19. Compare Mobile IP & Cellular IP • Location management • Mobile IP: Care-of-address • Cellular IP: paging update packet • Routing • Mobile IP: registration • Cellular IP: routing cache • Handoff • Mobile IP: encapsulation, triangle routing • Cellular IP: routing cache

  20. Conclusion • Cellular IP represents a new approach to IP host mobility • Cheap passive connectivity using PC and RC • Flexible handoff • The important issue : Authentication and security

  21. End • Thanks~

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