Topology Controlling for QoS in Wireless Sensor Networks

Energy limitation is one of the most important characters in Wireless Sensor Networks (WSNs). Using energy efficiently is significant to prolong sensor network lifetime. The more repeated overlay is, the more energy is wasted. If we divide the nodes into some independent subsets and alternatively awake these subsets, the node energy is consumed slowly. However, the requirement of QoS is opposite to the energy. To solve this problem, the relationship between the desired QoS requirement and the minimum number of active nodes is analyzed in the randomly deployed sensor networks. We propose a Topology Controlling QoS (TCQS) Protocol for wireless sensor networks based on our analytical results. According to the energy and previous working status, our scheme selects the minimum number of active nodes without using any location information. Simulation results show that TCQS can not only reduce the energy consumption of nodes and increase the network lifetime, but also balance the energy consumption among nodes.