Improved GEAR Protocol for Small-Scale Wireless Sensor Network
Xu Wang · Journal of Nanjing University of Posts and Telecommunications · 2014
As a geographic location based energy aware routing protocol in wireless sensor networks, GEAR will lead to routing void and transient routing loop during the process of packet transmission due to insufficient knowledge of network topology information and limited node energy. Considering specific scenarios of small-scale networks,GEAR protocol is optimized and an improved routing mechanism, SGEAR,is presented to select a route based on node residual energy. Through the adjustment of the cost function,previously selected nodes,void nodes and the nodes with residual energy below a threshold cannot be chosen as the next hop. The SGEAR eliminates transient routing loop caused by the delayed broadcast of the modified node cost value. The protocol performance is improved by enhancing time efficiency. Simulation results show that SGEAR can reduce the numbers of void routing and network energy consumption,and prolong network life.