RECONN: Receiver-Driven Operating Channel Width Adaptation In IEEE 802.11ac WLANs

Seongho Byeon Seoul National University, Korea
Hwijae Kwon Seoul National University, Korea
Youngwook Son Seoul National University, Korea
Changmok Yang Seoul National University, Korea
Sunghyun Choi Seoul National University, Korea


State-of-the-art IEEE 802.11ac supports wide band-width operation, which enables aggregating multiple 20 MHz channels up to 160 MHz bandwidth, as a key feature to achieve high throughput. In this paper, our experiment results reveal various situations where bandwidth adaptation without changing the receiver's baseband bandwidth, called operating channel width (OCW), leads to poor reception performance due surprisingly to time-domain interference not overlapping with the incoming desired signal in frequency domain. To cope with this problem, we develop RECONN, a standard-compliant and receiver-driven OCW adaptation scheme with ease of implementation. Our prototype implementation in commercial 802.11ac devices shows that RECONN achieves up to 1.85× higher throughput by completely eliminating time-domain interference. To our best knowledge, this is the first work to discover the time-domain interference problem, and to develop OCW adaptation scheme in 802.11ac system.

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