Research Article
Traffic Scheduling for MPDCF MAC to Support QoS-Sensitive Data in IEEE 802.11 Wireless LANs
@INPROCEEDINGS{10.1109/COMSWA.2006.1665240, author={Hyungwook Yoon and Hyun Gi Ahn and Tae-Jin Lee and Kyunghun Jangz and Jin-Bong Chang}, title={Traffic Scheduling for MPDCF MAC to Support QoS-Sensitive Data in IEEE 802.11 Wireless LANs}, proceedings={1st International ICST Workshop on Wireless Personal and Local Area Networks}, publisher={IEEE}, proceedings_a={WILLOPAN}, year={2006}, month={8}, keywords={}, doi={10.1109/COMSWA.2006.1665240} }- Hyungwook Yoon
Hyun Gi Ahn
Tae-Jin Lee
Kyunghun Jangz
Jin-Bong Chang
Year: 2006
Traffic Scheduling for MPDCF MAC to Support QoS-Sensitive Data in IEEE 802.11 Wireless LANs
WILLOPAN
IEEE
DOI: 10.1109/COMSWA.2006.1665240
Abstract
In IEEE 802.11 wireless LAN (WLAN), it is very hard to meet QoS requirements (throughput, delay and loss rate) of multimedia traffic by using distributed coordination function (DCF). In order to support QoS in WLAN, enhanced IEEE 802.11 medium access control (MAC) protocol is discussed in IEEE 802.11 Task Group E. IEEE 802.11e uses the rather complex hybrid coordination function (HCF). In this paper, we propose a simple multipolling DCF (MPDCF) mechanism with the advantages of high channel efficiency and QoS support. In our proposed mechanism, an AP can decide the transmission order and duration of QoS-sensitive wireless stations and poll the stations whenever it needs based on the controlled backoff procedure. We propose a scheduling algorithm using the proposed MPDCF to serve real-time traffic with constant and variable bit rates. The simulation results show that QoS requirements of the traffic can be satisfied and the channel utilization is also increased with our scheduling mechanism