Emerging IEEE 802.11e WLAN for Quality-of-Service (QoS) Provisioning
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The IEEE 802.11e Medium Access Control (MAC) is an emerging supplement to the IEEE 802.11 Wireless Local Area Network (WLAN) standard to support Quality-of-Service (QoS). The 802.11e MAC is based on both controlled and contention-based channel access mechanisms. The controlled channel access is based on the poll-and-response protocol, and can be used for the parameterized and rigid QoS support. On the other hand, the contention-based channel access is based on the carrier-sense multiple access with collision avoidance (CSMA/CA), and can be used for the prioritized and probabilistic QoS support. We first introduce the characteristics of the 802.11e based on the up-todate draft. Then, we evaluate the contention-based channel access, called enhanced distributed coordination function (EDCF), which will be a mandatory part of 802.11e, in comparison with the 802.11 legacy MAC. The EDCF provides differentiated channel access to the frames with different user priorities. Through our simulation study, with realistic home networking traffic scenarios, the 802.11e EDCF is found to provide the probabilistic QoS very well as was designed.
Abstract
The IEEE 802.11e Medium Access Control (MAC) is an emerging supplement to the IEEE 802.11 Wireless Local Area Network (WLAN) standard to support Quality-of-Service (QoS). The 802.11e MAC is based on both controlled and contention-based channel access mechanisms. The controlled channel access is based on the poll-and-response protocol, and can be used for the parameterized and rigid QoS support. On the other hand, the contention-based channel access is based on the carrier-sense multiple access with collision avoidance (CSMA/CA), and can be used for the prioritized and probabilistic QoS support. We first introduce the characteristics of the 802.11e based on the up-todate draft. Then, we evaluate the contention-based channel access, called enhanced distributed coordination function (EDCF), which will be a mandatory part of 802.11e, in comparison with the 802.11 legacy MAC. The EDCF provides differentiated channel access to the frames with different user priorities. Through our simulation study, with realistic home networking traffic scenarios, the 802.11e EDCF is found to provide the probabilistic QoS very well as was designed.