Traffic Regulation based Congestion Control algorithm in Sensor Networks

In order to solve the problem that the node are respond slowly and unsteadily in the existing congestion control algorithms for sensor network traffic control with dynamic changes of network status, an algorithm based on traffic regulation is proposed. In the algorithm, congestion can be avoided and controlled by sending Traffic Regulating Factors from the father node to the children nodes according to the queue size and current traffic arrival rate of the father node. In order to produce traffic regulating factors, pre-assigned rates in bottleneck nodes are considered for the control of packet round-trip delay. At the same time, the Sink node makes reverse transmission of traffic regulating factors one hop-by-hop according to Minimum Event Detection Degrees. Based on the traffic regulating factors, the source nodes can adjust the data packet generation rate adaptively, and the congestion problem can be fundamentally resolved. Simulation results show that the proposed algorithm is an effective algorithm for congestion control, which can raise network throughput, reduce packet loss rate, and stabilize node queue length.