Title :
QoS (quality-of-service) improvement in IEEE 802.11e enhanced distributed channel access (EDCA)
Author :
Kyung, Hyunmin ; Seo, Sangho ; Park, Sin-Chong
Author_Institution :
Syst. Integration Technol. Inst., Inf. & Commun. Univ., Taejeon, South Korea
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). IEEE 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. On the other hand, the contention-based channel access, called EDCA, is based on the carrier-sense multiple access with collision avoidance (CSMA/CA). This paper proposes an algorithm that enhances the QoS of the enhanced distributed channel access (EDCA) in 802.11e. The proposed algorithm, named enhanced distributed contention control (EDCC), estimates the congestion level of the channel without overheads and adapts it for deciding transmission of data. Simulation experiments show that the proposed algorithm increases the channel utilization ratio more than 30%, reduces collision rate more than 50%, and reduces voice drop rate about 8% and video drop rate about 75% in comparison with EDCA. Moreover, the complexity of the proposed algorithm remains similar to the EDCA, enabling the design of low-cost implementations.
Keywords :
IEEE standards; carrier sense multiple access; multimedia communication; quality of service; telecommunication congestion control; telecommunication standards; telecommunication traffic; wireless LAN; CSMA/CA; EDCA; EDCC; IEEE 802.11 wireless local area network; IEEE 802.11e enhanced distributed channel access; IEEE 802.11e medium access control; MAC; QoS improvement; algorithm complexity; carrier-sense multiple access with collision avoidance; channel congestion level estimation; channel overheads; channel utilization ratio; collision rate; contention-based channel access mechanisms; controlled channel access mechanisms; data transmission decision; enhanced distributed channel access; enhanced distributed contention control; low-cost implementations; poll-and-response protocol; quality-of-service; simulation; video drop rate; voice drop rate; Algorithm design and analysis; Communication standards; Communication system traffic control; Delay; Distributed control; Electronic mail; Media Access Protocol; Quality of service; Telecommunication traffic; Wireless LAN;
Conference_Titel :
Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on
Print_ISBN :
0-7803-8593-4
DOI :
10.1109/ISCIT.2004.1412858