航空自组网退避算法研究

Backoff Algorithm for Aeronautical Ad Hoc Networks

退避算法是一种用于多用户共享无线网络信息传输冲突的解决策略,是航空自组网研究的重要方面。退避算法能有效减小多用户节点间的碰撞概率,提高节点接入信道的公平性,改善系统性能。本文对航空自组网的MAC层退避算法进行研究,并介绍了航空自组网的MAC层协议,研究了两种常用的退避算法在航空自组网模型下的退避性能。仿真结果表明:当信道忙闲程度一定时,随着请求接入用户数的增多,二进制退避算法和P-坚持算法的平均传输次数递增,但二进制退避算法的性能明显优于P-坚持算法。

Backoff algorithm is widely used for information transmission in multi-user shared wireless networks; it can effectively reduce the collision probability, improve fairness and make system better. This paper introduces the MAC layer＇s protocol and two backoff algorithms, which are simulated in some conditions. Results indicate that when the channel＇s state is determined, the number of average transmission times is increasing with the increase of users, and the performance of the binary exponential backoff algorithm is better than that of P-insist algorithm.