Researches On The Policy Of Energy Reserving In The Wireless Ad Hoc Networks

Wireless Ad Hoc networks, which consist of a group of mobile nodes equipped with transceivers, is a dynamic reconstructable multi-hop network without the support of fixed infrastructures and has some characteristics such as distributed, self-organizing, self-configuring, self-managing, and so on. Due to energy limitation, the wireless Ad hoc networks face with the challenges such as lifetime, effective utilization of wireless resource and end to end delay. In such network, by utilizing the proper Policy of Energy Reserving (PER), the energy consumption can be reduced; meanwhile, the lifetime of network can be prolonged. Focusing on the problem of PER, the policy of Random Power Control (RPC), Power Control Algorithm based on Position of the node (PCAP), Time-based Broadcasting for Power-aware Routing (TBPR) protocol, Topology-based Power-aware Routing (TPR) protocol and Region-cost based Power-aware Routing (RPR) protocol are explored.Considering the characteristics of wireless Ad hoc network, the policy of RPC is firstly researched in chapter 2, in which the transmission power of nodes according to uniform distribution on the power interval. The successful probability of data transmission is analyzed by the method of random processes. Additionally, the performances are compared under the different model parameters. Results indicated that RPC can make good performance such as guaranteeing communication between nodes, reducing energy consumption and prolonging the lifetime of network.Following the idea of chapter 2, chapter 3 continues the investigation of PER at MAC layer. Therefore, the PCAP is proposed, in which analyzed the relationship of energy reserving between neighbor nodes by utilizing position distribution of node, and accomplished the power setting according to the optimized neighbor set, so the transmission power of node can be reasonably reduced.Based on the chapter 2 and chapter 3, chapter 4, 5 and 6 investigate the PER at network layer. In chapter 4, the TBPR protocol is proposed. By using mechanism of deferring route request packets and comparing accumulative power consumption in the route, the route that consumed lower energy is selected for data exchanging. In chapter 5, based on the optimized neighbor set in chapter 3 and the conception of broadcasting the route request packets in chapter 4, the TPR protocol is proposed. In the TPR protocol, the process of relaying route request packets is controlled by the optimized neighbor set. By route setting tightly combining with topology control, which is relative independence process in the traditional topology control routing protocol, the power-efficient route is established.Another research hotspot of PER at network layer, which is maximizing network lifetime for power-aware routing, is explored in chapter 6. Thus, the RPR protocol is proposed. In the RPR protocol, the energy consumption in the receiving process is considered. By controlling the process of route request packets broadcast, and balancing the energy consumption in network via introducing the region cost of node, the route that has moderate hops is selected and the lifetime of network is maximized.Finally, chapter 7 summarizes the dissertation, reviews the above research work and presents the future research directions.