重叠还是不重叠：在高密度WLAN中实现信道绑定
To overlap or not to overlap: Enabling Channel Bonding in High-Density WLANs
摘要：
无线局域网（WLAN）是最流行的一种无线互联网连接，因为它们的部署和操作简单。因此，通过WLAN访问互联网的设备（如笔记本电脑、智能手机或可穿戴设备）的数量正在急剧增加，同时应用程序的吞吐量要求也在急剧增加。为了应对这些挑战，信道绑定（CB）技术被用于通过在更宽的信道中发送来实现更高的数据率，从而提高频谱效率。然而，重要的问题，如更高的潜在的同信道和相邻信道干扰时出现绑定信道。这可能会损害载波侦听多路访问（CSMA）协议的性能，因为经常性的退避冻结，同时使节点对隐藏节点的影响更加敏感。在本文中，我们解决了以下问题：它方便高密度（HD）无线局域网使用更宽的信道和潜在的频谱重叠？首先，我们突出DCB在玩具场景中的关键方面，通过连续时间马尔可夫网络（CTMN）模型。然后，通过广泛的模拟，涵盖了广泛的流量负载和接入点（AP）密度，我们表明，动态信道绑定（DCB）-它适应每个数据包传输的信道带宽-显着优于传统的单信道平均。然而，结果也证实，DCB更容易产生不公平的情况下，无线局域网可能会饿死。与目前大多数在HD部署中推动非重叠信道的想法相反，我们强调了将尽可能宽的信道分配给WLAN的好处，同时实施自适应接入策略以应对可能出现的不公平情况。
英文摘要：
Wireless local area networks (WLANs) are the most popular kind of wireless Internet connection because of their simplicity of deployment and operation. As a result, the number of devices accessing the Internet through WLANs such as laptops, smartphones, or wearables, is increasing drastically at the same time that applications' throughput requirements do. To cope with these challenges, channel bonding (CB) techniques are used for enabling higher data rates by transmitting in wider channels, thus increasing spectrum efficiency. However, important issues like higher potential co-channel and adjacent channel interference arise when bonding channels. This may harm the performance of the carrier sense multiple access (CSMA) protocol because of recurrent backoff freezing while making nodes more sensitive to hidden node effects. In this paper, we address the following point at issue: is it convenient for high-density (HD) WLANs to use wider channels and potentially overlap in the spectrum? First, we highlight key aspects of DCB in toy scenarios through a continuous time Markov network (CTMN) model. Then, by means of extensive simulations covering a wide range of traffic loads and access point (AP) densities, we show that dynamic channel bonding (DCB) - which adapts the channel bandwidth on a per-packet transmission - significantly outperforms traditional single-channel on average. Nevertheless, results also corroborate that DCB is more prone to generate unfair situations where WLANs may starve. Contrary to most of the current thoughts pushing towards non-overlapping channels in HD deployments, we highlight the benefits of allocating channels as wider as possible to WLANs altogether with implementing adaptive access policies to cope with the unfairness situations that may appear.
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