Abstract
The IEEE 802.11e standard intends to enhance the Quality of Service (QoS) by introducing Hybrid Coordination Function Controlled Channel Access (HCCA). In HCCA, the QoS-enabled Station (QSTA) is assigned a Transmission Opportunity (TXOP) based on TS Specification (TSPEC) assigned during traffic setup time. Allocating fixed TXOP is only efficient for scheduling Constant Bit Rate (CBR) applications. However, Variable Bit Rate (VBR) traffics are not adequately supported via this approach, as its usage results in non-deterministic traffic profile. More specifically, this leads to degradation in the performance of the multimedia transmission and reduction in the number of admitted traffics. In this work, we propose an efficient admission control unit, called Feedback-based Admission Control Unit (FACU). The proposed scheme aims at maximizing the utilization of the surplus bandwidth which has never been tested in previous schemes. The FACU exploits piggybacked information containing size of subsequent video frames to increase the number of admitted flows. The proposed method is analytically evaluated using different video sequences. The results show that the FACU maximizes the number of admitted video streams comparable to other proposed techniques without jeopardizing the assigned QoS constraints.
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