Research On Clustering Protocol And MAC Protocol In Wireless Sensor Network

Wireless sensor network is a kind of new network technology which based on collaborative efforts of multiple self-organized dynamic nodes, under lots of extremely constraints namely limited energy, abominable environment which are deployed, limited communication ability and so on. Without the support from any fixed infrastructure, this type of network can provides an extremely flexible method for collecting all kinds of information from the environment which are in totally distributed network system. The inherited characteristics of wireless sensor network make it useful for many applications, such as environment monitoring, battlefield surveillance and home automation. However, they also bring in a lot of research challenges at the same time. One of the important issues is the key technology in wireless sensor network, which including routing technology, data aggregation, clustering protocol, clock synchronize etc., since the conventional approaches adopted for traditional networks are not directly used in wireless sensor network because of its specific characteristics.The key technologies in wireless sensor network are the basement to the development of any real application. In this dissertation, we attempt to resolve some problems in several kind of key technology which including clustering protocol and MAC protocol. In order to enhance the performance of the classic Passive Clustering protocol(PC), we analyze the characteristics of several traditional protocol and adopt the idea of hierarchy within a cluster, finally propose a new energy-efficient hierarchical passive clustering according to the specific characteristics of wireless sensor network and current research. We used a popular emluator which name is OMNET++ to validate the protocol. The results of experiment demonstrated that this scheme has several advantages, i.e. it can efficient enhance clustering performance and saving energy.In another hand, for MAC protocol, we improve the current MAC protocol idea and propose a new W-MAC protocol based on the thinking of TDMA and awakening mechanism. We also use the emluator to validate the protocol. The results show that this scheme is better at the aspect of saving energy, short response time and lifetime.