Research On Power Control Routing Algorithms For Wireless Sensor Networks

Wireless sensor networks have made domestic and international researchers chaseand becomes one of the most sought-after research directions because of its wide rangeof applications, such as military defense, medical rescue, transportation counseling,environmental monitoring, etc. As one of the key technologies in WSN, the research onrouting algorithm has been of vital significance and application value. As the sensornodes in wireless sensor networks generally rely on battery power, and there arelimitations about energy which is restricted, so power controlling has become one of themost important issues that need to be considered in research and design of wirelesssensor networks.The key of this paper aims at the power control routing algorithm which has becomea relatively new research direction in WSN. Based on power control technology, powercontrol routing algorithms in WSN can fit into the environment of wireless sensornetwork, and can effectively reduce the average energy consumption of the nodes andprolong the normal service life of the network. Through the analysis of currentmainstream research direction of power control technology, this thesis proposes aAODV routing algorithm based on decision threshold and a linear AODV routingalgorithm based on power balance with the traditional AODV routing algorithm forprototype which is standardized by IETF to discusses the control power routingalgorithm from different angle.Research and exploration on power control routing algorithm in this thesis aremainly explained in the following three aspects:(1) Clearly define the concept of powercontrol routing algorithm in WSN and make a detailed study of four mainstreamresearch directions in the world.(2) Propose a AODV routing algorithm based ondecision threshold (G-AODV), and this algorithm adopts the power control strategybased on local optimization, fully uses the cross layer design ideas, and shares theresidual energy information and power information of physical layer, controlling nodesto get into dormancy or activation in order to achieve the purpose of saving energy. Thisalgorithm borrows the ideas of distributed negotiation algorithm in GAF routing anddesigns a good node activation mechanism. And it is also compared with the traditionalAODV routing algorithms by simulation experiment and discusses the effect of theimpact factor initial energy decision threshold(g) and transform coefficient of decision threshold(δ) on G-AODV routing algorithm’s performance. The simulation results showthat selecting the appropriate impact factor can effectively improve the energyefficiency of G-AODV routing algorithms.(3) Propose a linear AODV routingalgorithm based on power balance (PB-AODV). As this algorithm adopted the powercontrol strategy based on particular direction, especially for linear topological structureof the wireless sensor network, original design purpose of traditional AODV routingalgorithms is for mobile Ad hoc working group on network without the consideration ofenergy efficiency. PB-AODV introduces the concept of RSSI values and powerthreshold to route discovery process to adjust transmitting power of nodes in thenetwork in order to draw energy information into of routing algorithm and finallyachieve the purpose of influencing path selection. And theoretically there is amathematical analysis that this algorithm can decrease power consumption and prolongthe network lifetime. The simulation results show that PB-AODV routing algorithm caneffectively balance the load of nodes in the linear network, and the network lifetimeincreases by14.3%comparing with the traditional AODV routing algorithm.