NDLI: Providing Service Guarantees in 802.11e EDCA WLANs with Legacy Stations

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Providing Service Guarantees in 802.11e EDCA WLANs with Legacy Stations

Content Provider	IEEE Xplore Digital Library
Author	Banchs, A. Serrano, P. Vollero, L.
Copyright Year	2002
Abstract	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, we address the problem of providing throughput guarantees to EDCA stations in a WLAN in which EDCA and DCF stations coexist. To this aim, we propose a technique that, implemented at the Access Point (AP), mitigates the impact of DCF stations on EDCA by skipping with a certain probability the Ack reply to a frame from a DCF station. When missing the Ack, the DCF station increases its CW, and thus, our technique allows us to have some control over the CWs of the legacy DCF stations. In our approach, the probability of skipping an Ack frame is dynamically adjusted by means of an adaptive algorithm. This algorithm is based on a widely used controller from classical control theory, namely a Proportional Controller. In order to find an adequate configuration of the controller, we conduct a control-theoretic analysis of the system. Simulation results show that the proposed approach is effective in providing throughput guarantees to EDCA stations in presence of DCF stations.
Sponsorship	IEEE Computer Society
Starting Page	1057
Ending Page	1071
Page Count	15
File Size	1993311
File Format	PDF
ISSN	15361233
Volume Number	9
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless LAN Throughput Quality of service Proportional control Control theory Control systems Degradation Proposals Adaptive algorithm Control system analysis control theory. WLAN 802.11 802.11e EDCA DCF ACKS legacy stations throughput guarantees
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Electrical and Electronic Engineering Software

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