Abstract
The popularity and wider acceptance of IEEE 802.11 based WLANs has resulted in their dense deployments in diverse environments. While this massive deployment can potentially increase capacity and coverage, the current physical carrier sensing of IEEE 802.11 cannot limit the overall interference induced and also cannot insure high concurrency among transmissions. Recently, the IEEE 802.11 working group has continued efforts on developing WLAN technology through the creation of the TGax, which aims to improve efficiency of densely deployed IEEE 802.11 networks. In this paper, we propose a Dynamic Sensitivity Control for Access Point (DSC-AP) algorithm for IEEE 802.11ax. This algorithm dynamically adjusts the Carrier Sensing Threshold (CST) of an AP based on received signal strength from its associated stations and interfering APs. We show that the aggregate throughput of a dense network (under asymmetric traffic conditions) utilizing DSC (both at the stations and AP) is considerably improved (i.e. up to 32%) when compared with legacy IEEE 802.11.
Highlights
The IEEE 802.11 WG has actively continued to release new draft amendments to incorporate latest technological advances to defy new practical challenges
We extend our previous work by first providing analytical justification for dynamically adopting Carrier Sensing Threshold (CST) threshold of each station
The DYNAMIC SENSITIVITY CONTROL ALGORITHM FOR ACCESS POINTS (DSC-AP) scheme we propose operates to facilitate more concurrent transmissions to occur by tuning the CST of AP based on the Received Signal Strength Indication (RSSI) received from its furthest associated station2
Summary
The IEEE 802.11 WG has actively continued to release new draft amendments to incorporate latest technological advances to defy new practical challenges. TGax is currently working on the extension of the IEEE 802.11ac standard, but this time aiming to improve the system capacity instead of increasing the supported data rates at link level This new project is intended to improve the efficiency in scenarios that are interference limited (due to high density of IEEE 802.11 devices). We propose a DSC-AP algorithm that dynamically adjusts the CST of APs and expose an increase in throughput within a dense network while utilizing DSC at stations as well as APs. Importantly, we study the impact of DSC on system performance under asymmetric traffic that provides vital and comprehensive discussion of various aspects of the proposed scheme in more realistic environment.
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