An Exploration of Transmission Power Optimization Method for Concurrently Communicating Two Access-Points in Wireless Local-Area Network

Abstract

Nowadays, IEEE 802.11n wireless local-area networks (WLAN) has become popular around the world due to advantages in capacity, reachability, and affordability. In WLAN, any host or terminal device is connected with an access-point (AP) using wireless signal. Thus, the AP transmission power should be optimized for improving the performance in WLAN, considering the capacity and interference. Previously, we proposed an AP transmission power optimizationmethod for a single AP considering the link capacity to a host. In this paper, we explore an AP transmis sion power optimization method for two concurrently communing APs in WLAN. Unlike the single AP case, it needs to consider the interference between two APs, too. As a simple method, either the maximum or minimum power is selected for each AP such that it maximizes the signal-to-noise ratio (SNR) among the four combinations. The accuracy of this proposal is investigated through extensive experiments using Raspberry Pi APs in eight network fields with various host locations. The results show that it provides the best performance except for three cases among 144 cases