A noble cross-layer protocol for QoS optimization in wireless sensor networks

A good data transmission protocol should balance energy consumption, packets collision and some other factors well. The traditional layer protocol can´t sufficiently meet the complex requirement of data transmission. So a new cross-layer communication protocol is proposed to solve the balance issue. In the algorithm, a directed spanning tree routing algorithm is discussed to resolve unnecessary energy consumption during data transmission. Regarded as a key factor, transmission power of node should be controlled to decrease the intensity of communication contention. A NUM model is constructed to control power. Based on Prim-dual Algorithm, a Lagrange dual function is designed and optimal solution set of transmission power is deduced. Make use of these cross-layer optimal schemes, WSNs achieve energy efficiency and smooth communication mode. The simulation results show that the performance of the proposed protocol is much better in energy efficiency and improvement of communication throughput.