一种802.11功率控制MAC协议及仿真研究

A Power Control MAC Protocol Based on 802.11 and Computer Simulation

提出了一种基于IEEE 802.11的功率控制MAC(medium access control)协议,在控制包中包含发送功率和容许接收功率,通过两个通信节点之间的控制信息的交换来决定数据包的发送功率和限制其他邻节点的发送功率,有效降低隐藏终端和暴露终端之间的干扰,并且在数据接收的同时允许邻节点同时发送信息.通过仿真与802.11MAC协议进行比较,结果表明,在移动自组网中,该功率控制协议能够提高系统的吞吐量性能,而大大减少移动节点的功率消耗,提高节点的能量利用效率,并降低超过93%的系统能耗.

A power controll MAC （medium access control） protocol based on IEEE 802.11 is presented. Transmission power and the permitted receiving power of messages are comprised in the control packets. Through exchange of control information between a pair of communication nodes transmission power of the data packet is determined, and the neighbor nodes＇ transmission power is restricted, which can effectively reduce interference between hidden terminals and exposed terminals. The protocol also allows neighbor nodes to transmit messages during data receiving. In simulation the protocol is compared with the IEEE 802.11 MAC protocol. The results indicate that, in mobile ad hoc networks, the powercontrol protocol can improve the network throughput performance, while significantly reduce power consumption of mobile nodes and improve energy utilization efficiency of mobile terminals. Moreover, it can reduce energy consumption of the system by more than 93 % .