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Wireless local area networks (WLANs) are the most popular kind of wirelessInternet connection because of their simplicity of deployment and operation. Asa result, the number of devices accessing the Internet through WLANs such aslaptops, smartphones, or wearables, is increasing drastically at the same timethat applications' throughput requirements do. To cope with these challenges,channel bonding (CB) techniques are used for enabling higher data rates bytransmitting in wider channels, thus increasing spectrum efficiency. However,important issues like higher potential co-channel and adjacent channelinterference arise when bonding channels. This may harm the performance of thecarrier sense multiple access (CSMA) protocol because of recurrent backofffreezing while making nodes more sensitive to hidden node effects. In thispaper, we address the following point at issue: is it convenient forhigh-density (HD) WLANs to use wider channels and potentially overlap in thespectrum? First, we highlight key aspects of DCB in toy scenarios through acontinuous time Markov network (CTMN) model. Then, by means of extensivesimulations covering a wide range of traffic loads and access point (AP)densities, we show that dynamic channel bonding (DCB) - which adapts thechannel bandwidth on a per-packet transmission - significantly outperformstraditional single-channel on average. Nevertheless, results also corroboratethat DCB is more prone to generate unfair situations where WLANs may starve.Contrary to most of the current thoughts pushing towards non-overlappingchannels in HD deployments, we highlight the benefits of allocating channels aswider as possible to WLANs altogether with implementing adaptive accesspolicies to cope with the unfairness situations that may appear.

To overlap or not to overlap: Enabling Channel Bonding in High-Density WLANs