Research On Cross-layer Algorithm In WSNs

Wireless sensor networks (WSNs) have been widely studied and usefully employed in many applications. WSNs consist of small battery powered devices with limited energy resource. Once deployed, the tiny sensor nodes are usually inaccessible to the users. Hence, power efficiency is an important design goal that needs to be enhanced in order to prolong the effective time of a network with a limited power supply. And a lot of researches have been developed today.In this paper, an Integrated MAC and Routing protocol (IMR) is proposed solving the energy problem for wireless sensor networks (WSNs). IMR is proposed for WSNs deployed for detecting rare events which require prompt detection and response. IMR organizes the network into concentric tiers around the sink(s), and event is reported by forwarding them from one tier to another in the direction of (one of) the sink(s). We evaluate IMR through analysis and simulations, and compare it with S-MAC. IMR outperforms S-MAC for event-detection applications, in terms of total average power consumption.Firstly, Chapter 1 presents the basis and background of the WSNs mainly. Then points out the limit, so derives the main question: saving energy. Chapter 2 presents Data link layer and makes some analysis and tells introduces S-MAC carefully. Chapter 3 presents classification of routing protocols in WSNs and its category, then detailedly introduces Directed Diffusion protocol and LEACH protocol. Chapter 4 introduces a new solution of energy-saving according to the theory of LEACH an S-MAC. It is an integrated algorithm in MAC and routing layer. This is IMR. We give its mathematical model and evaluate IMR through analysis. Last chapter summarizes the paper and look into the future of WSNs.