Drake Patrick Mirembe (PhD)

ICT& Management Consultant, Innovations & Cyber Security Specialist, Data Scientist, Business & Technology Entrepreneur, Christian & Farmer

Mugisha Ravasco Ian

Project / Thesis:

F-BaCaCs: Flow-Based Call Admission Control Scheme for 802.11e EDCA Networks

Year of Completion:


Student / Candidate Level

Masters Student

Thesis Abstract

ThegrowthofmobilewirelessnetworksspecificallyIEEE802.11standardhaslead to the growth of innovative applications and products being offered over wireless local area networks to expend tremendously, for example: wireless internet access, application of IP telephony and Voice over Internet Protocol, data and video streaminge.t.c. Notwithstanding, thatwirelesslocalareanetworkswereoriginally designedfordatatransfer,todaytheyaretremendouslysupportinginteractiveand real time applications such as Voice over IP protocol and video streaming etc. However, support for these and emerging applications that are delay, loss and bandwidth bound over IEEE 802.11wireless networks is crucial for wireless technology becoming a realistic alternative for mobile internet access. In order to supportconvergenceandaddressperformancelimitationofwirelesslocalareanetworks WLANs in supporting converged voice, video and data traffic flows, it is important that; practical schemes are employed to always ensure that the admission of the sensitive traffic flows such Voice over internet protocol over WLANs does not oversubscribe beyond the achievable throughput. The key question addressed in this study is, ‘given N number of traffic flows categorized by 802.11e access categories AC[i], existing in a QoS enabled basic service setBSS(AbasicservicesetBSSwhichisthebasicbuildingblockof802.11wireless LANs, consists of a single access point AP and associated mobile stations in infrastructuremode)-Can 802.11e network accommodate a new traffic flow with specific quality of service requirements without affecting existing flows?’. In this study, we have developed a call admission control scheme termed as FBaCaCs that uses the criteria of network utilization characterization and achievable throughput to effectively control admission of Voice over IP into IEEE 802.11 WLANs. In defining our admission control scheme F-BaCaCs, we use the network utilization characterization NUC as metric for the network load and the network achievable throughput to effectively determine whether a given new flow can be admitted or rejected. In evaluating the proposed scheme, we analyzed the different traffic flows performance through simulation and analytical means, with and without the implementation of the proposed admission control. Flow level performance metrics such as blocking probability, average transmission rate, drop probability and packet level metrics were used for performance evaluation. The results show that the proposed scheme improves the network responsiveness to changes in traffic load and admission decisions.

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