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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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Presentation on theme: "FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS Prof. Edmund Yeh Jian Cao Yufang Xi Nov. 18, 2003."— Presentation transcript:

1 FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS Prof. Edmund Yeh Jian Cao Yufang Xi Nov. 18, 2003

2 MAIN CHALLENGES IN WIRELESS COMMUNICATIONS Fading Multi-user interference Power/energy limitation Randomly varying traffic Distributed implementation

3 BASIC APPROACH Cohesive cross-layer framework Fundamental limits and insights Joint power control, rate allocation, routing, to maximize throughput and minimize delay

4 CELLULAR NETWORKS Base Station Uplink Downlink

5 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

6 MULTI-HOP WIRELESS NETWORKS Source 2 Destination 2 Source 1 Destination 1

7 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

8 FUTURE DIRECTIONS Distributed implementations Multiple antennas Delay optimization


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