Scheduling Approaches for Wireless Sensor Networks

In Wireless Sensors Network (WSN) the energy parameter is important. The traffic management needs a clever scheduling algorithm that can balance the energy consumption and the time slots also can be divided according to the traffic pattern. Every sensor node collects the environmental data and sends it to the coordinator. Using scheduling algorithm allows the communication process to be done in a collision-free mode. This work propose two scheduling algorithms called semi-dynamic and dynamic. They are executed over ZigBee/IEEE 802.15.4 network. The network coordinator is programmed to organize and synchronize the network based on the proposed algorithms. They are implemented in beacon-enabled mode. The beacon frames are defined only by the network coordinator. The beacon exchanging process between the coordinator and its child routers keep all sensor nodes synchronized. Our work is to use the scheduling algorithm in organizing beacon frames as well as super frames. We have validated our work by implementing the proposed algorithms over TelosB sensors. They are implemented under TinyOS environment.