VoIP over WLANs by Adapting Transmitting Interval and Call Admission Control

VoIP over wireless local area network (WLAN) is an important application of WLAN and gaining more and more attention. In this paper, we analyze the maximum number of VoIP calls in WLAN and propose a new call admission control strategy, namely, adaptive transmitting interval call admission control (ATICAC) to enhance VoIP calls in 802.11 WLANs. In ATICAC strategy, base station (BS) adaptively changes the transmitting interval of the active stations to prevent the network from saturation by controlling the average collision probability pc of the network. The proposed model is in good agreement with our simulation results. ATICAC can not only ensure the QoS of VoIP calls in 802.11 WLANS in the network, but also increase the number of VoIP calls in the network.

[1]  Yuguang Fang,et al.  A call admission and rate control scheme for multimedia support over IEEE 802.11 wireless LANs , 2004, First International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks.

[2]  Sachin Garg,et al.  Can I add a VoIP call? , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[3]  S. Choi.  IEEE 802.11e contention-based channel access (EDCP) performance evaluation , 2003 .

[4]  Yunhao Liu,et al.  Rendered Path: Range-Free Localization in Anisotropic Sensor Networks With Holes , 2007, IEEE/ACM Transactions on Networking.

[5]  Sunghyun Choi,et al.  Enhancement of VolP over IEEE 802.11 WLAN via dual queue strategy , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[6]  Henning Schulzrinne,et al.  Experimental Measurement of the Capacity for VoIP Traffic in IEEE 802.11 WLANs , 2007, IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications.

[7]  Soung Chang Liew,et al.  Solutions to performance problems in VoIP over a 802.11 wireless LAN , 2005, IEEE Transactions on Vehicular Technology.

[8]  A. Girotra,et al.  Performance Analysis of the IEEE 802 . 11 Distributed Coordination Function , 2005 .

[9]  Hung-Yu Wei,et al.  On Admission of VoIP Calls Over Wireless Mesh Network , 2006, 2006 IEEE International Conference on Communications.

[10]  Jiandong Li,et al.  A novel self-adaptive transmission scheme over an IEEE 802.11 WLAN for supporting multi-service , 2006, Wirel. Commun. Mob. Comput..

[11]  Hongqiang Zhai,et al.  How well can the IEEE 802.11 wireless LAN support quality of service? , 2005, IEEE Transactions on Wireless Communications.

[12]  Yunhao Liu,et al.  Underground Structure Monitoring with Wireless Sensor Networks , 2007, 2007 6th International Symposium on Information Processing in Sensor Networks.

[13]  Jiandong Li,et al.  An Adaptive IEEE 802.11 Scheme for Voice and Data Services in Wireless LANs , 2007, Fifth Annual Conference on Communication Networks and Services Research (CNSR '07).