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Published byMildred Bailey Modified over 9 years ago
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Murad Khalid, Yufeng Wang, In-ho Ra, and Ravi Sankar University of South Florida IEEE Transactions On Vehicular Technology, VOL. 60, NO. 7, SEPTEMBER 2011 Two-Relay-Based Cooperative MAC Protocol for Wireless Ad hoc Networks
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Outline Introduction Goal 2rcMAC protocol Simulation Conclusion
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Introduction The cooperative communication approach effective uses of spatial diversity in wireless ad hoc networks Improved throughput Delay performance 60s 20s
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Related Work CoopMAC I Its performance deteriorates under fading conditions due to lower direct path or relay path reliability
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Related Work UTD MAC Not fully benefit from higher throughput relay path (compared with the direct path) since it uses relay path only as a secondary backup path
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Goal We propose a 2rcMAC protocol Better transmission reliability Higher throughput through the relay path Higher performance under fast-fading conditions
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System Model 2rcMAC protocol Single-channel / Single-hop ad hoc network Multiple data rates of 1, 2, 5.5, and 11 Mb/s Control packets and headers are transmitted at 1 Mb/s
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1Mbps 2Mbps 11Mbps 5.5Mbps 2Mbps 2rcMAC protocol 1Mbps 2Mbps 11Mbps 5.5Mbps 2Mbps D D S S r1 r2
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2rcMAC protocol RR frame Eight-slot frame 7 bits per slot S S D D RTS CTS
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2rcMAC protocol The source node searches for the two best relay Start from the (11,11) rate category Total transmission time First best relay Second best relay
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2rcMAC protocol Four cases Two best relays Only one best relay No best relay No relay feedback
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2rcMAC protocol MAC header Only one relay Pick Relay NAV Adaptation
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Simulation ParameterValue Frequency2.4 GHz MAC header272 bits PHY header192 bits RTS/CTS/ACK160 bits/112 bits/112 bits Slots time20 us SIFS/DIFS10 us/50 us Payload1023 bytes CW max /CW min 1024/32 Rate for MAC, PHY header, RTS, CTS, ACK packtes1Mbps SIMULATION PARAMENTERS
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Simulation
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Thank You
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