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This paper studies how to achieve the maximal link throughputs in a CSMAwireless network through offered-load control. First, we propose an analyticalmodel, contention-graph-combination (CGC), to describe the relationship betweenthe offered-load and the output link throughputs of an unsaturated CSMAnetwork. Based on CGC, we then formulate a linear optimization model to improvethe aggregate link throughput through properly setting the occurrenceprobabilities of each sub-network, based on which we can obtain the optimaloffered-load of each link. Simulation results bore out the accuracy of our CGCanalysis and the maximal link throughputs can be closely achieved. Differentfrom prior work in which CSMA protocol parameters are adaptively adjusted toachieve better performance, in this paper we propose to achieve maximal linkthroughputs by adjusting the rates of the traffic pumped into the source nodesof links, which runs in a software manner and is more practical to implement inreal networks.

To Achieve Maximal Throughputs in CSMA Wireless Networks Through Offered_load Control