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The authors investigate a cross layer congestion control technique for TCP Reno-2 (NewReno) in CDMA-based wireless ad-hoc networks in which both TCP layer and PHY layer jointly control congestion. The PHY layer varies transmission power based on the channel condition, interference power received and congestion in the network and seeks to transmit at a minimum power level, whereas the TCP layer controls congestion using Reno-2 flow control. They show the convergence of their algorithm theoretically and through simulations. They demonstrate that their cross layer congestion control technique provides performance improvement in terms of throughput, window size variations, transmission power and converges to a stable value even with addition and deletion of flows to the network.
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