dynamic bandwidth quasi-reservation scheme for real-time services in ieee 802.16e networks
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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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
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Outline
Introduction Related Content in IEEE 802.16e
Standard The Dynamic Bandwidth Quasi-
Reservation Performance Simulation Conclusion
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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
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IEEE 802.16e Standard Two-phase activation model
Consideration for Handover cannot be guaranteed to get the required
bandwidth
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Dynamic bandwidth quasi-reservation scheme (DBQRS)
based on the handover probability the traffic arrival probability
Provide QoS guarantee for real-time multimedia services
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The Proposed DBQRS
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The probability of MS requiring BS to reserve bandwidth
Type 0 traffic Type 1 traffic
MS 1MS 2
MS …
SF 3
SF 0 SF 1
SF 2 SF 3
SF 0
SF 2
SF 1
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The probability of MS requiring BS to reserve bandwidth
handover and traffic arrival are independent
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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
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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
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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
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Admission Control Policy (real-time SF)
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Admission Control Policy (non-real-time SF)
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EX
Bandwidth
MS
…
Quasi-Bandwidth reservation
Bfree
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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
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Traffic models
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New SF blocking rate & Access delay
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Handover SF dropping rate & Bandwidth utilization
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Conclusion The proposed scheme not only provides Qo
S 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
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Thank you!