Deterministic Backoff: Towards Efficient Polling for IEEE 802.11e HCCA in Wireless Home Networks
The emergence of video streaming over wireless home networks creates renewed interests in design and analysis of new MAC protocols towards QoS provisioning for video applications. IEEE 802.11e HCCA (Hybrid coordination function Controlled Channel Access) exhibits good QoS provisioning for Constant Bit Rate (CBR) video streams in a single collision domain. However, its performance degrades significantly for Variable Bit Rate (VBR) video streams particularly in multi-collision domains. In addition, HCCA has the disadvantage of high complexity. In this paper, the authors introduce a DEterministic Backoff (DEB) method into the HCCA mechanism, which achieves virtual polling via carrier sense on the wireless channel.