Browsing by Author "Teklie, Mehari"

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    Incorporating Different Queuing Delay Bound in Active Drop Queue
    (Addis Ababa University, 2008-10) Teklie, Mehari; Manoj, V.N.V
    Delay sensitive applications, such as streaming video, Internet games, VoIP, etc., often sacrifice throughput for lower delay to obtain better quality. Active Drop Queue (ADQ) is an active Queue Management (AQM) technique, which guarantees queuing delay in the form of traffic contract with the assumption that all delay sensitive traffics requires the same constant queuing delay. It is a class based active queue management technique; i.e. conformant real time traffic, excess real time traffic and best-effort traffic. This thesis presents an extension of Active Drop Queue to incorporate different queuing delay bound in the original ADQ. This feature is achieved by sub-classing each real-time traffic class (conformant and excess) base on queuing delay requirements with dynamic queue size for each sub-class. The Proposed ADQ successfully incorporates different queuing delay bound in the existing ADQ. The performance and complexity of the proposed and the original ADQ is analyzed by simulation. It has been observed that the total number operation in the modified ADQ has increased, however the total number of excess packet drop is smaller than the original one as it uses use the available bandwidth effectively. Sub-classing reduces unnecessary removal of non expired excess packets due to early synchronization and lack of association of real time packets specific to application level.