一种基于CSMA/CA的退避改进算法

An improved back-off algorithm based on CSMA/CA

传统智能家居无线通信网络中,智能站点采用载波监听多路访问机制接入信道,站点通过竞争退避机制抢占信道,容易造成站点通信时延过长,导致信道资源利用率低的问题。针对以上问题,提出一种随机访问分组接入的信道访问机制算法,根据站点优先级将时间片动态划分成不同时间片,站点按照所划分的时间片依次对信道进行随机访问。仿真结果表明,改进后的算法能有效地降低站点退避次数,有效降低每个站点通信时延,有效地改善系统吞吐性能。

In traditional smart home wireless communication networks,smart devices access to channels according to carrier-sense multiple access mechanisms.Contention back-off mechanism easily causes long communication,resulting in low channel resource utilization.For the above problems,a channel access mechanism of random access and packet access algorithm is proposed.The time is dynamically divided into different slices in the light of the priority of the station,and stations randomly access the channel in turn according to the divided time slices.As the simulation shows,the proposed algorithm effectively reduces the number of avoidance of devices,in the meanwhile,single device communication delay is effectively reduced.The proposed algorithm also improves system throughput performance effectively.