Improve Converge Casting in Collection Tree Protocol(CTP)

Abstract

Many Wireless Sensor Network(WSN) appliction depends on collection service to route data packets towards sink node. The Collection Tree Protocol is one of the tree based protocol used for data collection.It is minimum cost routing tree which selects the path having minimum cost routing gradient. It will generate one or more trees to root which is called base station. When any node has data, it sends data up the tree which is forwarded to root. CTP used Expected transmission ratio (ETX) metric for tree consturction. It will indicate number of transmissions from a node to send a packet to destination and whose acknowledgment is successfully received. The residual energy of the node is an important key factor, which plays a vital role in the lifetime of the network and hence this has to taken as one of the metric in the parent selection. To improve converge casting of CTP, energy constrain is introduced into the tree construction procedure. The revised tree construction procedure is implemented and simulation results are generated and analyzed using the performance metrics: packet delivery ratio(PDR) and duplicate packets received.