Dynamic Switching with Heterogeneous Channels in Multichannel 802.11 WLANs
In a multichannel wireless system, the performance of a link depends on many factors. The link quality is subject to temporal, spatial and spectral diversity, i.e. the SNR is time varying, link-dependent and channel-dependent. In addition, the performance also depends on MAC dynamics and the degree of congestion present in the channel. As a result, different links can experience different performance on the same channel, and the performance of a link varies across channels and time. An effective way to exploit and cope with the diversity in the wireless system is to use opportunistic channel switching.