Abstract:

 The wireless mutiplehop network has a rapid development as a promising network technology in recent years. It has the merits of high reliability and good scalability, but its multihop and dynamic self-organizing feature have brought enormous challenges to the application of multimedia services. A systematic network utility maximization (NUM) based cross-layer design approach is proposed by using convex optimization methods for the joint optimization of physical, transport and MAC layers in order to maximize the network′s overall throughput while providing end-to-end QoS (Quality of Service) for multimedia traffic. Simulation results show that our cross-layer optimization can be iteratively performed based on local link information and the optimum TCP rate control and contention control parameters, which reduce the delay and maximize the system throughput while satisfying application’s QoS requirements.

Key words: cross-layer optimization; utility maximization; wireless mutiple-hop network; QOS； TCP； MAC