Providing reliability and QoS in multi-hop wireless networks: the ADHOCSYS approach
Proceedings of the 3rd international conference on Mobile multimedia communications
Quality of service in wireless LAN
EHAC'08 Proceedings of the 7th WSEAS International Conference on Electronics, Hardware, Wireless and Optical Communications
Softspeak: making VoIP play well in existing 802.11 deployments
NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
A collision-free MAC scheme for multimedia wireless mesh backbone
IEEE Transactions on Wireless Communications
Recursive analysis for soft handoff schemes in CDMA cellular systems
IEEE Transactions on Wireless Communications
Performance study and system optimization on sleep mode operation in IEEE 802.16e
IEEE Transactions on Wireless Communications
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Joint optimization of power saving mechanism in the IEEE 802.16e mobile WiMAX
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Computer Networks: The International Journal of Computer and Telecommunications Networking
Mobile Networks and Applications
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Voice over wireless local area network (VoWLAN) is an emerging application taking advantage of the promising voice over Internet Protocol (VoIP) technology and the wide deployment of WLANs all over the world. The real-time nature of voice traffic determines that controlled access rather than random access should be adopted. Further, to fully exploit the capacity of the WLAN supporting voice traffic, it is essential to explore statistical multiplexing and to suppress the large overhead. In this paper, we propose mechanisms to enhance the WLAN with voice quality of service (QoS) provisioning capability when supporting hybrid voice/data traffic. Voice multiplexing is achieved by a polling mechanism in the contention-free period and a deterministic priority access for voice traffic in the contention period. Header overhead for voice traffic is also reduced significantly. Delay-tolerant data traffic is guaranteed an average portion of service time in the long run. A session admission control algorithm is presented to admit voice traffic into the system with QoS guarantee. Analytical and simulation results demonstrate the effectiveness and efficiency of our proposed solutions