Scavenging the channel share : performance on sensing and allocation
Waqar Aslam, JJ Johan Lukkien · TU/e Research Portal · 2012
Perceptually appealing high graded streaming services maintain a persistent quality, even though the entropy levels of encoded information vary temporally/spatially. Transporting the streams over the network, imposes fluctuating QoS requirements on the underlying network, to cope up with these variations. Generally these requirements are mapped statically onto scarce wireless channel bandwidth using the IEEE 802.11e standard, which supports prioritized arbitration through a set of medium access control (MAC) mechanisms. In an absolute QoS protection policy, the static mapping considers the maximum share requirements of streams, though the reservation is not always utilized over time, and therefore wasted. This offers a challenge to dynamically tune the MAC mechanisms objectively to minimize the channel bandwidth wastage. Hence this paper present a dynamic channel reservation model, which can intercept the signals of potential adaptation of MAC mechanisms distributively, and react accordingly. The model is verified by simulations. The results demonstrate the gain in channel utilization due to the dynamic approach, and compare the performance of model for different MAC mechanisms. Such a study highlights unnoticed and unintended wastage of channel, which can be avoided. In a home like scenario, these reactive systems are highly desired for improved user experience.