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FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS Prof. Edmund Yeh Jian Cao Yufang Xi Nov. 18, 2003
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MAIN CHALLENGES IN WIRELESS COMMUNICATIONS Fading Multi-user interference Power/energy limitation Randomly varying traffic Distributed implementation
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BASIC APPROACH Cohesive cross-layer framework Fundamental limits and insights Joint power control, rate allocation, routing, to maximize throughput and minimize delay
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CELLULAR NETWORKS Base Station Uplink Downlink
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RESOURCE ALLOCATION FOR UPLINK AND DOWNLINK Transmitter 1 Transmitter 2 Transmitter N Packets Fading State Queue State at time t R 1 (t), P 1 (t) R 2 (t), P 2 (t) R N (t), P N (t) Controller
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MULTI-HOP WIRELESS NETWORKS Source 2 Destination 2 Source 1 Destination 1
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RESOURCE ALLOCATION FOR MULTI-HOP WIRELESS NETWORKS 1 2 3 4 5 6 A 11 (t) A 12 (t) A 21 (t) A 31 (t) H 24 (t) H 12 (t) H 13 (t) H 36 (t) H 35 (t) V1V1 V2V2 A i1 (t) A i2 (t) A iK (t) p ij,r ij p im,r im
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FUTURE DIRECTIONS Distributed implementations Multiple antennas Delay optimization
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