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A Selective Delayed Channel Access (SDCA) for the high-throughput IEEE 802.11n

Research output: Contribution in Book/Report/ProceedingsConference contribution

Published

Publication date2009
Host publicationWireless Communications and Networking Conference, 2009. WCNC 2009. IEEE
Place of publicationNew York
PublisherIEEE
Pages1173-1178
Number of pages6
ISBN (Electronic)978-1-4244-2948-6
ISBN (Print)978-1-4244-2947-9
Original languageEnglish

Conference

ConferenceIEEE Wireless Communications and Networking Conference
CityBudapest
Period5/04/098/04/09

Conference

ConferenceIEEE Wireless Communications and Networking Conference
CityBudapest
Period5/04/098/04/09

Abstract

In this paper we investigate the potential benefits of a selective delayed channel access algorithm (SDCA) for the future IEEE 802.11n based high-throughput networks. The proposed solution aims to resolve the poor channel utilization and the low efficiency that EDCA's high priority stations adhere due to shorter waiting times and consequently to the network's degrading overall end performance. The algorithm functions at the MAC level where it delays the packets from being transmitted by postponing the channel access request, based on their traffic characteristics. As a result, the flow's average aggregate size increases and consequently so is the channel efficiency. However, in some situations we notice that further deferring has a negative impact with TCP applications, thus we further introduce a traffic awareness feature that allows the algorithm to distinguish which flows are using the TCP protocol and override any additional MAC delay. We validate through various simulations that SDCA improves throughput significantly and maximizes channel utilization.