A QoS Enhancement Scheme through Joint Control of Clear Channel Assessment Threshold and Contending Window for IEEE 802.11e Broadcasting

Table 1

Configuration of the contending window.

Channel utilization ratios	Network conditions
	Low channel utilization ratio
	Intermediate channel utilization ratio
	High channel utilization ratio

is selected from denoting four types of services in IEEE 802.11e; indicates the channel utilization ratio; is the minimum contending window of the th type of service when the network is in the low channel utilization case.