Maximum Throughput of IEEE 802.11 Access Points: Test Procedure
Improving throughput by tuning carrier sensing in 802.11 wireless networks
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Transcript of Improving throughput by tuning carrier sensing in 802.11 wireless networks
Improving throughput by tuning carrier sensing in 802.11 wireless networks
Computer Communications 2009
Qiang Shena, Xuming Fanga,
Rongshen Huangb, Pan Lib, Yuguang Fangb
a: Provincial Key Lab of Information Coding and Transmission, Southwest Jiaotong University b: Department of ECE, University of Florida
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Outline Introduction Wireless network models Solution to the blocking problem Performance evaluation Conclusions
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IntroductionIn 802.11 MAC protocol
Physical carrier sensing thresholdHidden terminal problem
Exposed terminal problem Spatial reuse
Tuning carrier sensing threshold(range) && Channel rateImprove the network throughput
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Wireless network models A successful reception
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Interference model Chain topology
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Wireless network models A successful reception
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How to determine the k
k = 3, S0=6.02
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Solution to the blocking problem Optimum sensing range for RTS Optimum sensing range for CTS Maximization of the achievable data
rate
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Optimum sensing range for RTS
SS RR11 22 33 44
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d
Optimum sensing range for CTS
SS RR11 22 33 44
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Maximization of the achievable data rate
The relationship between the spatial reuse and the max achievable data rate
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Simulator: NS2Payload : 8000 bitsChain topologyK = 3rc = 6Mbps
Performance evaluation
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Out of TR
Throughput of node 1-2 and 4-3
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Throughput of Node 1-2 and 3-4
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End-to-end throughput with different values of k
Chain topology: 7 nodesAlleviate intra-flow contention
Increasing the RTS sensing range of the source node (IRSR)
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End-to-end throughput comparison of different methods
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Throughput comparison of IRSR and DAW
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Delay comparison of IRSR and DAW
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Conclusions In this paper
Tuning physical carrier sensing Maximizing channel rate
Improving network throughput Increasing spatial reuse
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Thank You!!
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