CONGESTION CONTROL IMPROVED QoS ROUTING SCHEME FOR WIRELESS SENSOR NETWORK

Abstract

Wireless sensor network is distributed self-governing sensors used to monitor the physical conditions of the environment. They are constructed by nodes where each of them is connected to sensors. These sensor nodes acquire real time information and transmit the information. When large number of sensor nodes are active in transmitting the information there is a possibility of congestion in the data packets. Congestion occurs due to buffer overflow, channel contention, packet collision, reporting rate, many to one nature, dynamically time varying wireless channel condition. Hence, congestion needs to be controlled in order to improve the Quality of Service (QoS) of the system in terms of packet loss which in turn decreases network performance. Many congestion control algorithms are available in literature. It is proposed to develop a QoS based congestion avoid Relative Coordinate Rumour Routing protocol with a straight line random walk approach. The main aim is to assess the performances of the proposed protocol under various scenario and considering dissimilar parameters such as network size or the positions of Beacon nodes. Performances are evaluated through network simulator2.The simulation results indicate superiority of proposed scheme compared with congestion based Rumour Routing, in terms of performance indices with minimum packet loss.