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Handover Management in IEEE 802.11 WLAN

Handover Management in IEEE 802.11 WLAN. Sonia Waharte School of Computer Science University of Waterloo. Introduction. New wireless technologies Access to the Internet. Challenge: Mobility Support. Outline. Mobile IPv6 Hierarchical IPv6 Fast Handover Protocol. From Mobile IPv4….

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Handover Management in IEEE 802.11 WLAN

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  1. Handover Management in IEEE 802.11 WLAN Sonia Waharte School of Computer Science University of Waterloo

  2. Introduction • New wireless technologies • Access to the Internet Challenge: Mobility Support Sonia Waharte - University of Waterloo - 05/29/2003

  3. Outline • Mobile IPv6 • Hierarchical IPv6 • Fast Handover Protocol Sonia Waharte - University of Waterloo - 05/29/2003

  4. From Mobile IPv4… • 1996: IETF designed MIPv4 (RFC 2002) Sonia Waharte - University of Waterloo - 05/29/2003

  5. … to Mobile IPv6 • February 2003: IETF draft #21 Binding Update Binding Acknowledgment Sonia Waharte - University of Waterloo - 05/29/2003

  6. IEEE 802.11 • 2 topologies • Ad hoc • Infrastructure Sonia Waharte - University of Waterloo - 05/29/2003

  7. MIPv6 Handover Procedure (1) Sonia Waharte - University of Waterloo - 05/29/2003

  8. MIPv6 Handover Procedure (2) • Verification of the uniqueness of the node link-local address (Duplication Address Detection RFC 2462) • Address auto-configuration to form a new CoA • Stateful Configuration: DHCP • Stateless Configuration: Router Advertisement • Verification of the uniqueness of the address (DAD) • Update binding process Sonia Waharte - University of Waterloo - 05/29/2003

  9. MIPv6 Handover Enhancement (1) Several CoA Sonia Waharte - University of Waterloo - 05/29/2003

  10. MIPv6 Handover Enhancement (2) • Among the CoA: Primary CoA • If unavailable, the MN can inform its HA to forward the packets intended to the old AR • Bicasting: simultaneous registration between several ARs. Packets duplication Not scalable Lots of traffic Sonia Waharte - University of Waterloo - 05/29/2003

  11. Hierarchical Mobile IPv6 MIPv6 • Binding process is time-consuming • Signaling overhead Hierarchical IPv6 • Local Registration • Minimize the amount of signaling Sonia Waharte - University of Waterloo - 05/29/2003

  12. Hierarchical Architecture (1) Sonia Waharte - University of Waterloo - 05/29/2003

  13. Modes of Hierarchical MIPv6 Basic Mode • MN has 2 addresses • Regional CoA • On-link CoA • Mobility anchor acts as a HA Extended Mode • No individual Regional CoA • Mobility: binding table Sonia Waharte - University of Waterloo - 05/29/2003

  14. Bicasting in HMIPv6 • Bicasting by HA not scalable • HMIPv6: bicasting from the Mobility anchor point • Problem of scalability still remains if the mobility anchor point has too many MNs to handle. Sonia Waharte - University of Waterloo - 05/29/2003

  15. Fast Handover Protocol (1) • Extension of MIPv6 Concept: Anticipation of the L3 handover based on L2 triggers Main L2 triggers - Link up - Link Down - L2 Handover Start Sonia Waharte - University of Waterloo - 05/29/2003

  16. FHP: Anticipated Handover 3bValidation Request 2Forwarding of L2 Triggers 4Address Validation 1L2 Triggers 3aNew CoA Sonia Waharte - University of Waterloo - 05/29/2003

  17. FHP: Tunnel Based Handover • The MN delays the CoA process • Tunnel between the old AR and the new AR • The MN create a new CoA in parallel with its communications Sonia Waharte - University of Waterloo - 05/29/2003

  18. Handover latencies Sonia Waharte - University of Waterloo - 05/29/2003

  19. Conclusions • Mobile IPv6: Significant latency • Problematic for real-time applications • In a domain: Hierarchical IPv6 • Otherwise: Fast Handover Protocol Sonia Waharte - University of Waterloo - 05/29/2003

  20. References • Montavont, N.; Noel, T. “Handover management for mobile nodes in IPv6 networks” IEEE Communications Magazine Aug 2002 Page(s): 38 -43 • IETF draft March 2003, “Fast Handover for Mobile IPv6” • IETF draft October 2002, “Hierarchical MIPv6 Mobility Management” • IETF draft February 2003, “ Mobility support in IPv6” Sonia Waharte - University of Waterloo - 05/29/2003

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