摘要： 针对无线多跳网络环境，改进了IEEE 802.11 DCF的二进制指数退避算法，提出一种基于源节点和转发节点区分机制的退避算法。该算法能根据网络冲突状况，自适应地调节退避窗口，更适合多跳网络中流量分布不均的特点。仿真结果表明，该种区分退避机制能同时适应于低速和高速的网络环境，与BEB和AASC两种退避算法相比，在提高网络的吞吐量的同时，也提高了流间的公平性，表现出了更好的网络性能。

关键词: 无线多跳, 退避算法, IEEE 802.11

Abstract: This paper proposes a differentiated back-off algorithm for multi-hop wireless networks. The algorithm is developed from two innovative ideas: to reduce the contention in a single flow, it is necessary to reduce the transmission rate of source node; to improve the spatial utility ratio, it is important to reduce the idle slots during transmission. Simulation studies show that the DBA performances better than BEB and AASC for throughput and fairness both in low-load and high-load networks.

Key words: wireless multi-hop, back-off algorithm, IEEE 802.11

中图分类号: 

• TP393