Research On Power Control For Wireless Ad-hoc Networks

Wireless ad-hoc network is a multi-hop network formed by a cluster of mobile hosts without fixed infrastructure provided by base stations. Since no base stations are required, one major advantage of such a network is that it can be rapidly deployed. The applications of wireless ad-hoc network appear in places whrer pre-deployment of network infrastructure is difficult such as natural disasters, battle fields. There are some technology problems, one of which is power control. Power control can affect a network in many aspects, such as connectivity, throughput, conflict, and so on. In this paper, we proposed two power control techniques based on multi-channel.We firstly proposed a multi-channel power control protocol with conflict deline mechanism(MCPCCD). In MCPCCD protocol, there are N data channel and one control channel. Nodes transmit datas with N different power levels, every of which corresponding to a data channel. This can avoid nodes with smaller power level being disturbed by nodes with bigger power level in the same channel. Besides, MCPCCD also alse introduced conflict deline mechanism to improve the spatial reuse of network. The simulation result shows that compared to DCA-PC protocol, MCPCCD protocol improved the network throughput.Then, a distributed multi-channel power control(DMCPC) algorithm was proposed. This algorithm combined power control with channel allocation. DMCPC algorithm assigns every node with a primary channel. All nodes receive messages on its primary channel, and must turn to its neighbour’s primary channel when it has message to send. DMCPC algorithm adjust nodes’ power level to control network topology, thus there are enough orthogonal channels for every node. The simulation result shows that compared to PCC algorithm, DMCPC algorithm improved the network throughput.