Reliability Guaranteed Data Transmission With Adaptive Multi-Coverage In Wireless Sensor Networks

As a new type of network, wireless sensor networks (WSNs) are much different with traditional networks. The energy of the nodes in WSNs is limited, and the wireless link is unreliable. How to make WSNs have better performance is always a major challenge.In this thesis, we introduced the WSNs in Section one, including the procedure of WSN's formation, the architecture and the features of WSNs. In Section two, we analyzed the present routing protocols and reliable transmission mechanisms in WSNs, and proposed a problem: how to realize the reliability guaranteed data transmission with energy efficiency. In order to settle this problem, we proposed a protocol called RTAM which could deliver packets at the desired reliability with low transmission cost by employing adaptive multi-coverage strategy. We described the protocol in detail in Section three and Section four. Sensors are deployed either randomly or evenly distributed to K-cover the monitored region, such that any point or sub area information could be sensed and delivered by multiple sensors and the network guarantees the desired reliability. Furthermore, in order to control the overhead of the reliable transmission, sensors automatically join to detection and reporting according to the desired reliability and local knowledge. Thus, RTAM can jointly optimize both information reliability and energy efficiency in sensor networks.In Section five, we did the simulations to compare the RTAM with SPIN protocol and the modified Direct Diffusion protocol. In the aspects of energy cost, life time of network, reliability of transmission, system delay and the robust of the network, we show the RTAM achieves better performance. This thesis is supported by The National Natural Science Funding "Effective Data Fusion Mechanism in WSNs".