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Dynamic Bandwidth Quasi-reservation Scheme for Real-time Services in IEEE 802.16e Networks

Dynamic Bandwidth Quasi-reservation Scheme for Real-time Services in IEEE 802.16e Networks. Yin Ge,and Geng-Sheng Kuo IEEE Wireless Communications and Networking Conference, 2007.WCNC 2007. Outline. Introduction Related Content in IEEE 802.16e Standard The Dynamic Bandwidth Quasi-Reservation

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Dynamic Bandwidth Quasi-reservation Scheme for Real-time Services in IEEE 802.16e Networks

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  1. Dynamic Bandwidth Quasi-reservation Scheme for Real-time Services in IEEE 802.16e Networks Yin Ge,and Geng-Sheng Kuo IEEE Wireless Communications and Networking Conference, 2007.WCNC 2007

  2. Outline • Introduction • Related Content in IEEE 802.16e Standard • The Dynamic Bandwidth Quasi-Reservation • Performance Simulation • Conclusion

  3. Introduction • IEEE 802.16e standard did not specify any bandwidth reservation scheme that provides quality of service (QoS) support for real-time services • Handover • real-time services > non-real-time

  4. IEEE 802.16e Standard • Two-phase activation model • Consideration for Handover • cannot be guaranteed to get the required bandwidth

  5. Dynamic bandwidth quasi-reservation scheme (DBQRS) • based on • the handover probability • the traffic arrival probability • Provide QoS guarantee for real-time multimedia services

  6. The Proposed DBQRS

  7. The probability of MS requiring BS to reserve bandwidth MS … MS 2 MS 1 Type 0 traffic Type 1 traffic SF 0 SF 1 SF 0 SF 1 SF 2 SF 3 SF 2 SF 3

  8. The probability of MS requiring BS to reserve bandwidth handover and traffic arrival are independent

  9. The probability of MS requiring BS to reserve bandwidth • Due to the different handover states as well as the diverse QoS requirements of traffics • Weighting coefficients αn • UGS • ERT-VR • RT-VR

  10. Handover states • Weighting coefficients βk • βin : immigrate into the BS’s coverage area from the neighbor cells • βstay : stay in the BS’s coverage area • βout : move out of the serving BS’s coverage area • dynamic bandwidth quasi-reservation for MSs according

  11. Admission Control Policy • Implemented a handover MS with active SFs enters the BS’s coverage, and a local MS issues new SFs • Real-time SFs arrive, non-real-time SFs must release the reserved bandwidth • By initiating DSC message to change the state of non-real-time SFs to be inactive

  12. Admission Control Policy (real-time SF)

  13. Admission Control Policy (non-real-time SF)

  14. EX … Bfree MS Bandwidth Quasi-Bandwidth reservation

  15. Performance Simulation • simulation model: OPNET Modeler • 7 hexagonal cells • 70 local MSs • 30 handover MSs per cell • evaluation on the central cell • weighting coefficients • α1=1 for UGS, α2=0.8 for RT-VR/ERT-VR • βin=1 for the incoming handover MSs, βstay=0.5 for the local MSs and βout=0.2 for the outgoing handover MSs

  16. Traffic models

  17. New SF blocking rate & Access delay

  18. Handover SF dropping rate & Bandwidth utilization

  19. Conclusion • The proposed scheme not only provides QoS guarantee for real-time services, but also ensures the fairness of admitting handover and new real-time services • The proposed scheme achieves low NSBR and HSDR, low access delay for new real-time service as well as high system bandwidth utilization

  20. Thank you!

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