Research Article
Supporting VoIP Services in IEEE 802.11e WLANs
@INPROCEEDINGS{10.1007/978-3-642-10625-5_31, author={Jeonggyun Yu and Munhwan Choi and Daji Qiao and Sunghyun Choi}, title={Supporting VoIP Services in IEEE 802.11e WLANs }, proceedings={Quality of Service in Heterogeneous Networks. 6th International ICST Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness, QShine 2009 and 3rd International Workshop on Advanced Architectures and Algorithms for Internet Delivery and Applications, AAA-IDEA 2009, Las Palmas, Gran Canaria, November 23-25, 2009 Proceedings}, proceedings_a={QSHINE}, year={2012}, month={10}, keywords={IEEE 802.11e EDCA VoIP QoS}, doi={10.1007/978-3-642-10625-5_31} }- Jeonggyun Yu
Munhwan Choi
Daji Qiao
Sunghyun Choi
Year: 2012
Supporting VoIP Services in IEEE 802.11e WLANs
QSHINE
Springer
DOI: 10.1007/978-3-642-10625-5_31
Abstract
Voice over Internet Protocol (VoIP) over Wireless Local Area Network (WLAN) is becoming popular thanks to its cost efficiency. However, it has been a challenge to provide good quality of VoIP services in WLANs, which is due mainly to (i) the nature of contention-based channel access of WLAN Medium Access Control (MAC); (ii) the presence of coexisting non-real-time data traffic; and (iii) the time-varying WLAN capacity caused by transmission rate diversity and variation of stations over time. In this paper, we propose a simple, effective and viable solution to improve the quality of VoIP services in 802.11e contention-based WLANs, which basically utilizes the advanced features of 802.11e MAC for QoS support. The key ingredients of our solution include (i) a priority queue to serve the VoIP traffic with higher priority than the non-real-time data traffic; and (ii) a conservative history-based admission control scheme for VoIP services, which accommodates the transmission rate diversity and variation of ongoing VoIP sessions over time. Simulation results demonstrate that our solution admits as many VoIP calls as possible without compromising the quality of their services.