A Testbed for Admission Control in WLANs: Effects of RSSI on Connection Keep-Alive Time

Many devices communicate over Wireless Local Area Networks (WLANs). The IEEE 802.11e standard for WLANs is an important extension of the IEEE 802.11 standard focusing on QoS that works with any PHY implementation. The IEEE 802.11e standard introduces EDCF and HCCA. Both these schemes are useful for QoS provisioning to support delay-sensitive voice and video applications. EDCF uses the contention window to differentiate high priority and low priority services. However, it does not consider the priority of users. In this paper, in order to deal with this problem, we propose a Fuzzy-based Admission Control System (FACS). We implemented a testbed using FACS and carried out an experiment. The experimental results show that the connection keep alive time becomes longer, when the RSSI is increased. Also, the user request succsess ratio and connected time ratio are increased when the RSSI is increased.