高密度无线局域网下行带宽分配的访问控制数学模型

Yuto Katayama, D. Umehara, K. Wakasugi
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引用次数: 3

摘要

在用于无线局域网(wlan)的IEEE 802.11标准中,接入点(AP)和站点(sta)有机会通过载波感知多址免碰撞(CSMA/CA)在基本服务集(BSS)中传输数据帧。当BSS中STA数量多且流量大时,AP到STA的吞吐量会下降,因为它的传输机会受到严重限制。我们建立了一个访问控制的数学模型,用于在流量饱和的情况下为从AP到sta的下行链路分配带宽。该数学模型使我们能够通过均匀回退算法推导出AP上的争用窗口(CW)大小,从而即使在双向饱和流量下也能保证下行带宽。我们使用网络模拟器ns3证明了从数学模型中获得的CW大小的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A mathematical model of access control to allocate downlink bandwidth in high-density wireless LAN
In the IEEE 802.11 standards used for wireless local area networks (WLANs), an access point (AP) and stations (STAs) have opportunities to transmit the data frame in a basic service set (BSS) by carrier sense multiple access with collision avoidance (CSMA/CA). When there are a large number of STAs with high traffic in the BSS, the throughput from AP to a STA will deteriorate since its transmit opportunities are severely limited. We develop a mathematical model of access control to allocate bandwidth for the downlink from AP to STAs in the saturated traffic. The mathematical model enables us to derive a contention window (CW) size at AP with uniform backoff algorithm such that the downlink bandwidth is guaranteed even in the bidirectional saturated traffic. We show the validity of the CW size obtained from the mathematical model using a network simulator, ns3.
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