A Predictive Movement Based Handover Algorithm for Broadband Wireless Networks
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Transcript of A Predictive Movement Based Handover Algorithm for Broadband Wireless Networks
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A Predictive Movement Based Handover Algorithm for Broadband Wireless Networks
Po-Hsuan Tseng , Kai-Ten Feng
National Chiao-Tung University
WCNC 2008
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Outline
Introduction Proposed Mechanism Performance Evaluation Conclusions
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Introduction (Handover procedure of 802.16e -- Network Topology Acquisition)
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Introduction (Handover procedure of 802.16e – Handover Processing)
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Motivation and Goal
Conventional mechanism handover with signal only
To reduce the handover frequency with predictive mechanism
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Proposed PMHO Algorithm(Predictive Sideline-Traveling Scheme)
1. Initialization BSS: All the BSs that are within the transmission range of MS (except serving BS)
BSS={BSA, BSC, BSD}
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Proposed PMHO Algorithm (Predictive Sideline-Traveling Scheme)
2. Periodic Updates of the Scanning Set
BSS={BSA, BSC, BSD}BSS={BSC, BSD}
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Proposed PMHO Algorithm (Predictive Sideline-Traveling Scheme)
3. Prediction of Traveling Sideline(Delaunay triangulation)
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Proposed PMHO Algorithm (Predictive Sideline-Traveling Scheme)
3. Prediction of Traveling Sideline
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Proposed PMHO AlgorithmMSI (Moving State Indicator)
)/4log(20 0 dA
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Proposed PMHO AlgorithmMSI (Moving State Indicator)
Parameterd0 reference distance
di distance from MS to BS
λ wavelength
α enviorement change parameter
si shadowing effect
σ variance of si
Lf frequence correction
Lh height correction
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Proposed PMHO AlgorithmMSI (Moving State Indicator)
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Proposed PMHO Algorithm (Handover Decision)
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Performance Evaluation
Network layout Regular
carrier frequency(f) 2.5GHz
Antenna heights 30m for BS2m for MS
shadowing fading(σ) 10dB
correlation factor(k) 20m
velocities 0 ~ 30m/s
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Performance Evaluation
QPSK -125db
16-QAM -120db
64-QAM -115db
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Performance Evaluation
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Performance Evaluation
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Conclusions A predictive movement-based handover
(PMHO) is proposed for the IEEE 802.16e.
Without calculating the precise location of the mobile device.
The simulation results illustrate that both the handover number and size of the neighbor-scanning set can be reduced.