On the Feasibility of an Adaptive Movable Access Point System in a Static Indoor WLAN Environment

Tomoki MURAKAMI  Shingo OKA  Yasushi TAKATORI  Masato MIZOGUCHI  Fumiaki MAEHARA  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.7   pp.1693-1700
Publication Date: 2018/07/01
Publicized: 2018/01/10
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3291
Type of Manuscript: PAPER
Category: Antennas and Propagation
wireless local area network (WLAN) system,  adaptive movable access point (AMAP) system,  traffic offload,  k-means method,  time of arrival (ToA),  receive signal strength indicator (RSSI),  signal to interference and noise ratio (SINR),  

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This paper investigates an adaptive movable access point (AMAP) system and explores its feasibility in a static indoor classroom environment with an applied wireless local area network (WLAN) system. In the AMAP system, the positions of multiple access points (APs) are adaptively moved in accordance with clustered user groups, which ensures effective coverage for non-uniform user distributions over the target area. This enhances the signal to interference and noise power ratio (SINR) performance. In order to derive the appropriate AP positions, we utilize the k-means method in the AMAP system. To accurately estimate the position of each user within the target area for user clustering, we use the general methods of received signal strength indicator (RSSI) or time of arrival (ToA), measured by the WLAN systems. To clarify the basic effectiveness of the AMAP system, we first evaluate the SINR performance of the AMAP system and a conventional fixed-position AP system with equal intervals using computer simulations. Moreover, we demonstrate the quantitative improvement of the SINR performance by analyzing the ToA and RSSI data measured in an indoor classroom environment in order to clarify the feasibility of the AMAP system.