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The IEEE 802.11e standard introduced by IEEE 802.11 Task Group E (TGe)enhances the Quality of Service (QoS) by means of HCF Controlled Channel Access(HCCA). The scheduler of HCCA allocates Transmission Opportunities (TXOPs) toQoS-enabled Station (QSTA) based on their TS Specifications (TSPECs) negotiatedat the traffic setup time so that it is only efficient for Constant Bit Rate(CBR) applications. However, Variable Bit Rate (VBR) traffics are notefficiently supported as they exhibit nondeterministic profile during the time.In this paper, we present a dynamic TXOP assignment Scheduling Algorithm forsupporting the video traffics transmission over IEEE 802.11e wireless networks.This algorithm uses a piggybacked information about the size of the subsequentvideo frames of the uplink traffic to assist the Hybrid Coordinator accuratelyassign the TXOP according to the fast changes in the VBR profile. The proposedscheduling algorithm has been evaluated using simulation with differentvariability level video streams. The simulation results show that the proposedalgorithm reduces the delay experienced by VBR traffic streams comparable toHCCA scheduler due to the accurate assignment of the TXOP which preserve thechannel time for transmission.

Providing Dynamic TXOP for QoS Support of Video Transmission in IEEE 802.11e WLANs