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在无线局域网(W LAN)中,由于各个站点竞争信道引起的数据帧冲突严重损害了整个网络的性能。首先分析了目前提高无线局域网性能的算法及存在的问题,在此基础上提出了一种自适应分配传输机会(TXOP)的算法ATXOP。该算法根据当前信道隙利用率,动态地调整连续传输数据帧的数目。不仅减少了由传统竞争算法引起的网络拥塞,而且避免了固定分配传输机会带来的不公平性。算法简单易行。仿真结果表明,在保证公平性的同时,该算法能够有效地提高网络的吞吐量和降低数据帧传输平均延时。
In wireless LAN (W LAN), data frame collisions caused by contending channels at various sites seriously compromise the performance of the entire network. First of all, the current algorithms and existing problems of improving the performance of wireless local area networks are analyzed. Based on the above, an ATXOP algorithm is proposed to adaptively allocate transmission opportunities (TXOP). According to the current channel slot utilization, the algorithm dynamically adjusts the number of consecutively transmitted data frames. Not only reduces the network congestion caused by the traditional competition algorithm, but also avoids the unfairness brought by the fixed allocation transmission opportunity. The algorithm is simple and easy. Simulation results show that this algorithm can effectively improve the throughput of the network and reduce the average delay of data frame transmission while ensuring the fairness.