EDCA Parameter Optimization Based on Synchronized Time

IEEE 802.11 based wireless Local Area Networks (WLANs) are fast becoming the standard in homes, businesses, and public hotspots. As well as supporting conventional Internet applications such as email, file transfer and web access, WLANs are increasingly required to support Quality of Service (QoS)-centric applications such as Voice over IP (VoIP) and Video over IP, which are delay sensitive and require a certain level of throughput. This creates an urgent need for supporting QoS in 802.11-based WLANs. Whilst 802.11e goes some way towards meeting this need, severe congestion leading to unacceptable delays and packet loss can still occur. In this paper, we outline our plans to investigate how synchronized time implemented in end terminals can aid in optimizing 802.11e parameters to improve QoS for VoIP. Testing will be done using a combination of simulation using the NS-2 network simulator, with a practical test bed to back up our research.

[1]  Liam Murphy,et al.  Time Synchronization for VoIP Quality of Service , 2002, IEEE Internet Comput..

[2]  Sunghyun Choi,et al.  An analytic study of tuning systems parameters in IEEE 802.11e enhanced distributed channel access , 2007, Comput. Networks.

[3]  Chris Guy,et al.  Establishing how many VoIP calls a wireless LAN can support without performance degradation , 2006, WMuNeP '06.

[4]  Liam Murphy,et al.  An evaluation of the potential of synchronized time to improve voice over IP quality , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[5]  D.J. Leith,et al.  Experimental Evaluation of 802.11e EDCA for Enhanced Voice over WLAN Performance , 2006, 2006 4th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks.

[6]  Liam Murphy,et al.  An Evaluation of Delay-Aware Receiver Playout Strategies for VoIP Applications , 2004, NETWORKING.

[7]  Alias Mohd,et al.  Performance of voice over IP (VoIP) over a wireless LAN (WLAN) for different audio/voice codecs , 2007 .

[8]  Apurva Gaiwak,et al.  Performance Comparison of Contention-Based Channel Access Mechanism of IEEE 802.11 and 802.11e , 2007, 7th IEEE International Conference on Computer and Information Technology (CIT 2007).

[9]  Brahim Bensaou,et al.  Performance analysis of IEEE 802.11e contention-based channel access , 2004, IEEE Journal on Selected Areas in Communications.