Research On Energy-Efficient Protocol For Wireless Sensor Networks

With fast development of integrated circuit technique and technology of communication, wireless sensor networks (WSN) that made up with small sensors have been gaining great development and deployment. Compared with common wireless networks, WSNs usually have lower communication rate, lower power consumption level and are self-organized, sensors of which cannot be recharged due to their dreadful working environment. In the mean time, WSNs also suffer from time varying channel, which is a common problem of wireless networks. In wireless network based on CSMA, network throughput will suffer deep degradation when the channel quality is bad, which result in a declination of channel utilization rate. This drawback can be mitigated by introducing Auto Rate Fallback (ARF), and networks with ARF are called multi-rate networks. However, throughput of this kind of network is very low in that terminals with lower rate take up so much channel time that the whole network throughput get down consequently, which is called performance anomaly. In WSN, energy consumption is also a necessary consideration. This topic aims to optimize the throughput and network life time of WSN by introducing fairness, and redesign the current MAC protocol to testify our proposal. In the end, simulations are carried out to demonstrate the validation of our research, which shows a great improvement in network throughput and life time.