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Contention window adaptation using the busy-idle signal in 802.11 WLANs

机译：802.11 WLAN中使用忙闲信号的竞争窗口适配

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In a wireless local area network (LAN), packets can be lost for a variety of reasons, including collisions due to high traffic and channel errors due to poor channel conditions. In practice, however, nodes cannot easily differentiate between these types of loss. As a result, adaptations based on packet loss alone can result in significantly degraded performance. In 802.11 networks, wireless nodes avoid collisions via the Binary Exponential Backoff (BEB) protocol. This performs well for moderate numbers of nodes and low channel error rates, but is inefficient for large numbers of nodes, high channel error rates, or in the presence of hidden terminals. In this paper, we propose a contention window adaptation scheme in which nodes use information shared by the AP to optimize contention window sizes in a distributed fashion to improve network utility. We show via NS-2 simulations that our method can improve throughput by as much as 24% in the high node count scenario, 35% in the high channel error scenario, and 350% in the presence of hidden terminals.
机译：在无线局域网（LAN）中，由于由于信道条件不佳，由于通道条件不佳，包括由于高流量和信道错误而导致的碰撞可能会丢失数据包。然而，在实践中，节点不能轻易区分这些类型的损失。结果，仅基于分组损失的适应可能导致性能显着降低。在802.11网络中，无线节点避免了通过二进制指数退避（BEB）协议的冲突。这对中等数量的节点和低信道误差速率执行良好，但对于大量节点，高信道误差速率或在隐藏终端存在的情况下，效率低。在本文中，我们提出了一种争用窗口自适应方案，其中节点使用AP共享的信息以分布式方式优化争用窗口大小以改善网络实用程序。我们通过NS-2模拟显示，我们的方法可以在高节点计数方案中提高吞吐量，在高通道误差场景中为35％，在隐藏终端存在350％。

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