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Distributed Data Compression and Flow Balancing for Network Lifetime Optimization in Wireless Sensor Networks

The paradigm of large scale self-configuring wireless sensor networking has been at the focus of the networking and communication research for more than a decade due to their potential use in applications such as environmental sensing. Energy-efficient information extraction from the area over a wireless sensor deployed is one of the vital elements of wireless sensor networking. The sources of energy dissipation in a sensor node can be categorized into two main functional areas: communication energy dissipation and computation energy dissipation. Communication energy dissipation includes transmit and receive energy dissipation components. Computation energy dissipation includes sensing, data processing, and data compression components. Although there are many possible definitions of Quality of Service (QoS) for data networking, the definition specific to the sensor networks is the provided coverage for the sensed phenomena in the targeted area along with other metrics such as delay, jitter, and throughput. To provide the required QoS for extended operation lifetime in sensor networks the energy sources of the nodes should be used optimally, which suggests that the nodes should cooperate in sensing and transferring information for lifetime optimization (i.e., if a critical sensor node runs out of energy before the other nodes then the coverage provided by the whole sensor network deteriorates, thus, to avoid such situations the nodes in the network should cooperate to balance the energy dissipation collectively). In the general model considered for sensor networks, there is a base station in or near the sensed area and sensor nodes in the area transfer their data to the base station possibly by relaying their packets through intermediate sensor nodes acting as relays. To optimize the lifetime of such a sensor network (assuming the energy dissipation is due to communication energy dissipation consisting of transmit and receive energy dissipation components) the traffic generated by the sensor nodes should be transferred to the base station without letting some nodes run out of their limited battery energy before the other nodes. Transmit energy dissipation from node-i to node-j, ,depends on the specific parameters of the radio and the