A Research On Wireless Sensor Networks Congestion Control Mechanisms

Congestion in wireless sensor networks will not only lead to increasing packet loss rate and delay, but also cause a waste of valuable energy of nodes. This paper presents a Priority of Energy Congestion Relief Scheme (PECR). Nodes detect the occupancy rate of the buffer queue periodically firstly to determine the current degree of congestion, when the congestion occurs, the node would try to coordinate by building the best path for the temporary shunt regulator around itself, based on the congestion degree and the residual energy. As the simulation results showed, once the scheme has been adopted, the energy consumption of nodes reduces in the region where numbers of nodes exist, and the lifetime of the entire network improves.According to the whole design analysis of transport layer in WSN, Buffer seizure size as congestion threshold to judge the network condition has been adopted. With this method, network transport control packet quantity and node energy consumption have been decreased. It is one of the innovation point in this thesis. In congestion relief part, the theory of joined congestion degree and rest of energy as the mainly foundation of shunt node pick up is presented, to avoid the uncertainly of weight addition and the blindness of path choice. It is helpful to control the signal node power consumption and enhance whole lifetime of network. Besides, one kind of thought of priority of energy have been embodied.This paper also simulated the PECR by compare with relative protocols in OMNeT++, the behavior of the improvement was obviously. The Result of simulation validated the feasibility of the improvement. At the same time, there are some limits on this mechanism.