抄録
This paper proposes a congestion degree estimation method for train cars using wireless LAN (WLAN) in a simple manner because the public WLAN service area has recently been expanded. WLAN stations (STAs) frequently find a WLAN access point (AP) using WLAN control frames named probe request frames. In addition, many APs for public WLAN services are located in places such as railways and airports. In this paper, we investigate the congestion degree using WLAN control frames. Compared with the case of using the number of WLAN STAs obtained by probe request frames, we clarify that the correlation between the results of evaluation by visual observations and the received signal strength indicator (RSSI) values obtained by the beacon frames of a WLAN AP is higher.
