MAC Protocol Research on Wireless Sensor Network

Wireless sensor networks has become a hot research field of global information, has aroused great concern in many countries. Wireless sensor networks has become a research focus in academia and industry, and infrastructure as a wireless sensor network protocol stack MAC (Medium Access Control, MAC) protocol to determine the use of the radio channel, is responsible for the wireless node is assigned communication resources, directly affect the performance of the network as a whole, to become the most important research of wireless sensor network protocols.In this paper, an overview on wireless sensor networks, the energy consumption of the wireless sensor network MAC layer, the analysis of several typical MAC protocol, most of which are based on single channel MAC protocol, such as S-MAC、T-MAC and so on. These agreements through competition or scheduling mechanism, using the same channel transmission control information and data, reducing the channel utilization. And for the deployment of high-density, large-scale WSNs, single-channel MAC protocol will generate a large number of packet collisions, resulting in lower network throughput and latency larger problem. Relative to the single-channel MAC protocol, multi-channel MAC protocols increase network throughput and reduce latency performance has improved.In this paper, based on wireless sensor networks to improved MAC protocol. We present an energy-efficient multi-channel MAC protocol MCSMAC, designed with the objective of maximizing the throughput of WSNs by coordinating transmissions over multiple frequency channels. MCSMAC takes advantage of interference and contention-free parallel transmissions on different channels. It is based on scheduled access which eases the coordination of nodes, dynamically switching their interfaces between channels and makes the protocol operate effectively with no collisions during peak traffic. In this paper, based on scheduling multi-channel MAC Protocol (MCSMAC) contention and collision-free parallel transmission, select the appropriate time slot/channel on different channels. The simulation results show that the MCSMAC achieve the throughput is very close to maximum increase in the number of channel, MCSMAC support higher throughput, and meet wireless sensor networks typical characteristics of energy efficiency and scalability. There are36figure,1table and52references.