How Physical Carrier Sense Affects System Throughput in IEEE 802.11 Wireless Networks Zheng Zeng, Yong Yang and Jennifer C. Hou Department of Computer.

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Presentation transcript:

How Physical Carrier Sense Affects System Throughput in IEEE Wireless Networks Zheng Zeng, Yong Yang and Jennifer C. Hou Department of Computer Science, University of Illinois at Urbana- Champaign IEEE INFOCOM 2008

Outline Introduction Background Material Analytical Model Simulation Conclusion

Introduction IEEE DCF ▫CSMA  Detecting ongoing transmission and Mitigating interference  Physical and Virtual carrier sense ▫Back-off  Resolving contention

Introduction (cont.) IEEE DCF ▫CS th is a tunable parameter  Spatial reuse  Transmission quality ▫CS th Interference Spatial reuse Network Throughput

Background Material p-persistent Model that Characterizes IEEE DCF in WLANs Interference Model

p-persistent Model that Characterizes IEEE DCF in WLANs

Interference Model

Analytical Model Assumption ▫ ▫Max transmission range : R tx ▫SINR : β ▫Accumulative interference contributed by nodes that are outside R CS ▫

Analytical Model Multi-hop wireless network

Analytical Model – E(I)

Analytical Model – E(N c ) and E(T c )

Tpye-1 Collision Simultaneous transmission within the interference range

Tpye-2 Collision

Tpye-3 Collision

Modification of t v

Simulation setup J-sim ( 480 nodes (240 senders) 900m* 900m D SR = 80m Data rate = 2Mbps and 6Mbps CW size = 8 ~ 256 R CS = 140m~220m CBR packets of size = 512 KB

Simulation result

Conclusion New analytical model ▫Physical carrier sense ▫SINR ▫Collision caused by accumulative interference and hidden terminals Future research ▫The effect of CW ▫The effect of routing and MAC and intra-flow interference