一种无线传感器网络信道接入自适应慢速退避算法

Adaptive Slow Backoff Algorithm for Channel Access in Wireless Sensor Networks

无线传感器网络是一种特殊的无固定控制中心的多跳网络。由于其特殊性,传统CSMA协议直接应用于无线传感器网络中会带来数据包冲突增加和时延增大等问题。针对信道接入层已有退避算法,提出了一种自适应慢速退避算法。分析与仿真结果表明,与传统的IEEE802.11标准BEB算法和普通退避算法相比,该算法更为简单实用,能有效提高网络吞吐量,特别是在网路拥塞状况变化剧烈时,可减小额外开销并保持稳定的网络吞吐量。

Wireless sensor network is a special multi-hop network without a centralized administration. Because of its speciality, direct application of the traditional CSMA protocol may cause more collisions, long delay problems and so on. Based on the analysis of the existing backoff algorithms in access layer, this paper proposes an adaptive slow backoff algorithm. Analysis and simulation results show that the new algorithm can improve newwork throughput efficiently. Especially when the network congestion varies seriously, the new algorithm can reduce overhead and keep the network throughput stable.