Adaptive VoIP Playout Scheduling: Assessing User Satisfaction
IEEE Internet Computing
An Assessment of the Audio Codec Performance in Voice over WLAN (VoWLAN) Systems
MOBIQUITOUS '05 Proceedings of the The Second Annual International Conference on Mobile and Ubiquitous Systems: Networking and Services
Gauging VoIP Call Quality from 802.11 WLAN Resource Usage
WOWMOM '06 Proceedings of the 2006 International Symposium on on World of Wireless, Mobile and Multimedia Networks
Analysis of IEEE 802.11e for QoS support in wireless LANs
IEEE Wireless Communications
IEEE Network: The Magazine of Global Internetworking
Dynamic codec with priority for voice over IP in WLAN
MMSys '11 Proceedings of the second annual ACM conference on Multimedia systems
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In this paper we experimentally study the impact of two EDCA parameters, namely AIFSN and CWmin, on a mixed voice/data wireless transmission. In particular we investigate how the tuning of these parameters affects both the voice transmission quality and background data throughput. We predict end-to-end voice transmission quality from time varying transmission impairments using the latest Appendix to the ITU-T E-model. Our experimental results show that the tuning of the EDCA parameters can be used to successfully prioritize voice transmission over data in real 802.11e networks. We also demonstrate that the AIFSN parameter more effectively protects voice calls against background data traffic than CWmin. To the best of our knowledge, this is the first experimental investigation on tuning of MAC layer parameters in a real 802.11e WLAN network from the perspective of end-to-end voice transmission quality and end user satisfaction.