Providing Service Guarantees in 802.11e EDCA WLANs With Legacy Stations

Download Now Date Added: Aug 2010
Format: PDF

Although the EDCA access mechanism of the 802.11e standard supports legacy DCF stations, the presence of DCF stations in the WLAN jeopardizes the provisioning of the service guarantees committed to the EDCA stations. The reason is that DCF stations compete with Contention Windows (CWs) that are predefined and cannot be modified, and as a result, the impact of the DCF stations on the service received by the EDCA stations cannot be controlled. In this paper, the authors address the problem of providing throughput guarantees to EDCA stations in a WLAN in which EDCA and DCF stations coexist.