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Mobility Management For VoIP Service : Mobile IP vs. SIP

Mobility Management For VoIP Service : Mobile IP vs. SIP. T.T. Kwon, UCLA M. Gerla, UCLA S. Das, UTA S. Das, Telcordia.com. IEEE Wireless Comm. Oct. 2002. Outline. Introduction Mobile IP (MIP) Session Initiation Protocol (SIP) Shadow Registration Delay/Disruption Analysis Conclusion.

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Mobility Management For VoIP Service : Mobile IP vs. SIP

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  1. Mobility Management For VoIP Service : Mobile IP vs. SIP T.T. Kwon, UCLA M. Gerla, UCLA S. Das, UTA S. Das, Telcordia.com IEEE Wireless Comm. Oct. 2002

  2. Outline • Introduction • Mobile IP (MIP) • Session Initiation Protocol (SIP) • Shadow Registration • Delay/Disruption Analysis • Conclusion

  3. Introduction • The various wireless access technologies, 802.11, Bluetooth, 2G/2.5G/3G cellular. • The handheld nodes are going to be equipped with multiple wireless comm. Interface.

  4. Introduction (cont.) • Wireless technologies convergence • The Mobile Node (MN) would be able to choose the most suitable interface for specific appls. • Voice over IP (VoIP) service play a key role in the convergence of IP-based Internet and cellular networks.

  5. Design Issue • Mobility • AAA

  6. Mobility

  7. Mobility (cont.)

  8. AAA • Authentication, Authorization, and Accounting. • Who are you ? What can you do ? How much ? • The AAA solution be performed not only when user moves into the visited network but also when the user initiates Internet connectivity.

  9. Problem • In a wireless/mobile comm. environ., delay or disruption during with macro-mobility and micro-mobility must be minimized by providing seamless VoIP service.

  10. Solution • Mobile IP in Network Layer • SIP in Application Layer

  11. Mobile IP

  12. MIP (cont.)

  13. back Binding Update MIP (cont.) No one

  14. Binding Warring Re-tunnel packet MIP (cont.) New CoA

  15. Binding Update ACK Smooth Handoff in MIP Old CoA New CoA

  16. Smooth Handoff in MIP (cont.) New CoA

  17. Regional Registration • The MN changes its CoA within the visited domain, it performs registration locally. • When an MN first arrives at a visited domain, it performs registration with its HA, and the home network generates a registration key for the MN.

  18. Regional Registration (cont.) • This registration key is distributed to the MN and visited domain, and can be used for authentication of regional registration. • The CoA registered at the HA is the public routable address of a gateway foreign agent (GFA) if the visited domain supports regional registration.

  19. Regional Registration (cont.) • This CoA will not change when MN changes FA under the same GFA.

  20. Regional Registration (cont.) Ad domain

  21. Regional Registration (cont.) • MN : Mobile Node • RFA : Regional Foreign Agent • GFA : Gateway Foreign Agent • AAAF : AAA in Foreign Network • AAAH : AAA in Home Network • HA : Home Agent

  22. Regional Registration (cont.) • AMR : AA-Mobile-Node-Request • HAR : Home Agent Request • HAA : Home Agent Answer • AMA : AA-Mobile-Node-Answer

  23. Regional Registration (cont.)

  24. Intra-domain handoff use RR

  25. Inter-domain handoff 不同AD, Signal需透過AAA認證 AMR + U U ACK B W AMA +ACK B U

  26. SIP • Originally the SIP was designed only for roaming. • The most promising approach to maintain online connectivity during the SIP session in spite of handoff is to re-invite the CN by sending an INVITE message.

  27. SIP Registration • VR : Visited Registrar • HR : Home Registrar

  28. SIP Registration (cont.) SIP Proxy Location-S User Agent-S

  29. SIP Registration (cont.) CN

  30. RTP Translator in SIP • The proxy can re-write the media destination in the outing INVITE message as the proxy server or the affiliated RTP translator. • The MN handoff in the same domain without re-establishing the channel with the CN. (Thinking: GFA in MIP)

  31. Expedited Registration • Using in micro-mobility. • MN sends a SIP REGISTER message with the new address to VR. • VR verifies the user’s credentials and registers the user of the MN in its SIP database.

  32. Problem in MIP and SIP • The signaling for the inter-domain handoff takes much longer time. (macro-mobility)

  33. Shadow Registration • The security association between the MN and the AAA server in neighboring domains is established a priori before the actual handoff occurs. • 在第一次註冊時就在visited network的AAAF的相臨的AAAF上,全部註冊MN的記錄.

  34. Shadow Registration in MIP

  35. Shadow Registration in SIP

  36. Delay/Disruption Analysis

  37. Delay/Disruption Analysis (cont.)

  38. Conclusion • The disruption for handoff of the MIP is smaller than that of the SIP. • SIP shows shorter disruption when the MN and CN are close.

  39. Discuss

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