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Báo cáo hóa học: " A QoS guaranteeing MAC layer protocol for the “underdog” traffic"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : A QoS guaranteeing MAC layer protocol for the “underdog” traffic | Sarkar and Paolini EURASIP Journal on Wireless Communications and Networking 2011 2011 131 EURASIP Journal on . http jwcn.eurasipjournals.eom content 2011 1 131 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access A QoS guaranteeing MAC layer protocol for the underdog traffic Mahasweta Sarkar1 and Christopher Paolini2 Abstract With the tremendous boom in the wireless local area network arena there has been a phenomenal spike in the web traffic which has been triggered by the growing popularity of real-time multimedia applications. Towards this end the IEEE 802.11e medium access control MAC standard specifies a set of quality-of-service QoS enhancement features to ensure QoS for these delay sensitive multimedia applications. Most of these features are unfair and inefficient from the perspective of low priority non-real time traffic flows as they tend to starve the non-real time flows depriving them of appropriate channel access hence throughput. To that extent this article proposes a MAC protocol that ensures fairness in the overall network performance by still providing QoS for realtime traffic without starving the underdog or non-real-time flows. The article first presents analytical expressions supported by Matlab simulation results which highlight the performance drawbacks of biased protocols such as 802.11e. It then evaluates the efficiency of the proposed fair MAC protocol through extensive simulations conducted on the QualNet simulation platform. The simulation results validate the fairness aspect of the proposed scheme. 1. Introduction Financial organizations business houses and healthcare facilities have recently and repeatedly complained against network resource hogging by multimedia traffic when a minority section of their staff chooses to stream a video clip on Youtube which sabotages the transmission of an important data file like a patient s health record or a crucial email exchange 1 2 . This article investigates into .