Channel width adaptation and access in high-density WiFi networks
Haitao Zhao, Shaojie Zhang, Jibo Wei, Ying Li · 2014
WiFi will be an important choice to load off the ever increasing data demand of end users in future mobile converged networks, which will inevitably result in high-density WiFi deployments. However, higher density of WiFi networks is not a guarantee to obtain higher throughput, because of the increasing interference among end users and overlapped WiFi networks. As a solution to this problem, this research proposes a flexible framework for fine-grained channel width adaptation and multi-channel access in WiFi networks. The framework adopts DOFDM (Discontinuous Orthogonal Frequency Division Multiplexing) in physical layer, which allocates the frequency resource in the granularity of sub-carrier. And in MAC layer, it uses a frequency-time domain backoff scheme to decrease the access collision, resulting in higher access probability for the contending nodes.