A Single Channel Power Controlled MAC Protocol Of Ad Hoc Networks

Mobile Ad Hoc Network is a peer-to-peer network which is composed with a series of mobile nodes, it does not rely on any existing network infrastructure, nodes in the network are in a dynamic and random distribution, they are interconnected through a wireless channel. All nodes in the network have the ability of routing and forwarding data, they can form a small area communication system at any time. Ad Hoc networks can be widely used in battlefield communication, police and health sector disaster relief, sensor networks and many other fields, its strategic significance is very high.This paper analyzes the power control problem in Ad Hoc networks, and presents a power control MAC protocol called SCPCMAC. Wherein each node maintains a dynamic neighbor information table, the control packets include transmission power and allowable interference power, the exchange of control packets between two communicating nodes determines the transmission power and restrict the transmission power of the neighbor nodes, by allocating of each node’s maximum tolerable interference power effectively, the network actual radio channel spatial reuse is improved actually. This protocol is not only an effective solution to hidden terminal and exposed terminal problem, but also it does not limit neighbor nodes’ communication absolutely in the process of communication, it can improve the reusability of cyberspace channels, also the end to end network throughput performance can be improved effectively.According to the wireless signal fading model and theoretical wireless signal reception threshold SNR, we know theoretically that SCPCMAC protocol can effectively allocate each node’s maximum tolerable interference power, improve the wireless channel spatial reuse.In the NS2 network simulation platform, we contrast SCPCMAC with ATPMAC, and the results show that, this protocol not only can improve the network throughput effectively, but also can reduce the real energy consumption of the nodes, and reduce the energy consumed when producing a unit of throughput.