Supporting VoIP Services in IEEE 802.11e WLANs

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-realtime data traffic; and (ii) a conservative history-based admission control scheme for VoIP services, which accommodates the transmission rate diversity a...

• Type: Conference
• Year: 2009
• Where: QSHINE
• Authors: Jeonggyun Yu, Munhwan Choi, Daji Qiao, Sunghyun Choi
• Keywords: QSHINE 2009, Transmission Rate Diversity, VoIP, VoIP Services, Wireless Networks