一种基于自适应退避窗口的S-MAC协议改进算法研究

An Improvement Algorithm Research on S-MAC Protocol Based on Adaptive Backoff Window

在分析S-MAC协议的工作过程以及退避算法的基础上,针对二进制指数退避机制的缺点进行了改进。通过当前退避窗口值和信道忙计数器来反映当前信道的拥塞状况,使节点自适应地调节退避窗口的大小以减少再次碰撞。仿真结果表明,改进后的S-MAC在高速网络环境中提高了网络的吞吐率,并且减少了能量损耗,表现出更好的网络性能。

This paper analyzes the working process of S-MAC protocol and the principle of baekoff algorithm. An improvement is proposed aiming at the deficiencies of BEB backoff algorithm. The state of the wireless channel is informed by current backoff window and a counter that accumulates the times of busy state of the communication channel. The nodes can adaptively adjust the value of backoff window to reduce collision. The simulation results show that the performance of improved S-MAC protocol is better in both throughput and energy efficiency in the case of high-load networks.