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Broadband Wireless Communication and Multimedia Laboratory, Tongji University Lianhai Shan

Predictive Group Handover Scheme with Sub- Channel Borrowing for IEEE 802.16j-enabled Vehicular Networks. Broadband Wireless Communication and Multimedia Laboratory, Tongji University Lianhai Shan shanlianhai@hotmail.com. Outline. Features of Group Handover and Problems Statement

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Broadband Wireless Communication and Multimedia Laboratory, Tongji University Lianhai Shan

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  1. Predictive Group Handover Scheme with Sub-Channel Borrowing for IEEE 802.16j-enabled Vehicular Networks Broadband Wireless Communication and Multimedia Laboratory, Tongji University Lianhai Shan shanlianhai@hotmail.com

  2. Outline • Features of Group Handover and Problems Statement • Proposed Scheme: PGHO-CB • Performance Analysis • Simulation Scenario and Result Analysis • Conclusion and Future Work

  3. Mobile RS Application Scenario Relay Station: • Enhance the signal strength • Extend the coverage

  4. Group Handover Scenario Broadband Wireless Access using IEEE802.16j for Mobile Multi-hop WiMAX SINR of a neighbor BS is larger than the current serving BS, (the hysteresis margin, threshold), then the handover of group users will happen.

  5. Problems for Group Users • Heavy burden for BS • Long system delay in the GHO process • Handover dropping probability

  6. Outline • Features of Group Handover Problems Statement • Proposed Scheme: PGHO-CB • Performance Analysis • Simulation Scenario and Result Analysis • Conclusion and Future Work

  7. GHO Flow Chart

  8. ProposedScheme • PGHO-CB: Predictive Group Handover with sub-channel borrowing Predictive Group Handover (PGHO) • Location and moving direction information Channel Borrowing (CB) • Borrowing Channels from the existing service in the target BS by decreasing the QoS level.

  9. Proposed Scheme Movement History Database Large vehicles moving routes is fixed such as light rails, subways.

  10. : CBP of rtPS in a BS; : CBP of nrtPS in a BS; Result: is the number of sub-channels needed for the coming GHO is available sub-channels in the target BS Proposed Scheme • Erlang-B formula reversely to estimate the number of sub-channel required

  11. Proposed Scheme • Sub-Channel Borrowing (CB) for PGHO Detailed CB is within my published papers, will appear in LNCS of Apweb’09.

  12. Outline • Features of Group Handover Problems Statement • Proposed Scheme • Performance Analysis • Simulation Scenario and Result Analysis • Conclusion and Future Work

  13. Single Handover Model 2-D Markov state transition diagram

  14. Single Handover • New calls blocking probability (CBP) of rtPS and nrtPS rtPS nrtPS • handover blocking probability (HBP) of rtPS and nrtPS rtPS nrtPS

  15. Proposed Group Handover Markov transition diagram for a Single MS using PGHO scheme Markov transition diagram for a Group MSs using PGHO scheme

  16. Proposed Group Handover • New calls blocking probability (CBP) of rtPS and nrtPS

  17. Proposed Group Handover • handover blocking probability (HBP) of rtPS and nrtPS

  18. Adaptive HO CAC Delay • : represents the handover CAC adaptive factor • : represents exponential factor, decided by the different service types • : the highest speed • : the largest handover CAC delay time • : the least handover CAC delay time as

  19. HO Dropping under Different Velocity : HBP in the handover CAC process : the time of handover CAC process of each time : practical delay of handover CAC process If , handover QoS will reduce If , handover dropping will happen the longest handover CAC delay that can ensure the connection

  20. Outline • Features of Group Handover Problems Statement • Proposed Scheme • Performance Analysis • Simulation Scenario and Result Analysis • Conclusion and Future Work

  21. Simulation Parameter

  22. Simulation Parameter

  23. New calls and HO blocking probability

  24. Handover dropping probability

  25. Average handover delay

  26. Outline • Features of Group Handover Problems Statement • Proposed Scheme • Performance Analysis • Simulation Scenario and Result Analysis • Conclusion and Future Work

  27. Conclusion • PGHO-CB predict the target BS for mobile RS • Target BS prepare the needed resource for HO using the Sub-Channel Borrowing • Decrease the HDP significantly of group handover

  28. Future Work • Two-level Channel Reallocation for Group Handover after Sub-channel Borrowing • System Performance of GHO

  29. Thanks Q&A

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