Fitzgerald Emma, Körner Ulf, Landfeldt Bjorn
Department of Electrical and Information Technology, Lund University, 221 00, Lund, Sweden.
Telecommun Syst. 2017;66(2):197-215. doi: 10.1007/s11235-017-0275-6. Epub 2017 Feb 3.
TO-DCF, a new backoff scheme for 802.11, has the potential to significantly increase throughput in dense wireless LANs while also opportunistically favouring nodes with heavier traffic loads and/or better channel conditions. In this paper we present an analytical model to investigate the behaviour and performance of the TO-DCF protocol with regards to operating parameters such as the number of nodes, the contention window size and the backoff countdown probabilities. We then compare numerical results from an implementation of our model with simulations. Our model shows a high level of accuracy, even when the model assumptions are relaxed, and provides guidance for network operators to correctly configure the weight functions for nodes running TO-DCF given the network's operating conditions.
TO-DCF是一种用于802.11的新型退避机制,它有潜力显著提高密集无线局域网的吞吐量,同时还能机会性地优待流量负载较重和/或信道条件较好的节点。在本文中,我们提出了一个分析模型,以研究TO-DCF协议在诸如节点数量、竞争窗口大小和退避倒计时概率等操作参数方面的行为和性能。然后,我们将模型实现的数值结果与模拟结果进行比较。我们的模型显示出高度的准确性,即使在模型假设放宽的情况下也是如此,并为网络运营商在给定网络运行条件下为运行TO-DCF的节点正确配置权重函数提供指导。