Abstract
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-real-time data traffic; and (ii) a conservative history-based admission control scheme for VoIP services, which accommodates the transmission rate diversity and variation of ongoing VoIP sessions over time. Simulation results demonstrate that our solution admits as many VoIP calls as possible without compromising the quality of their services.
This research was supported by the MKE, Korea, under the ITRC support program supervised by the NIPA (NIPA-2009-C1090-0902-0006).
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
IEEE 802.11-1999, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, IEEE std. (August 1999)
IEEE 802.11e, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Medium Access Control Quality of Service Enhancements, IEEE std. (September 2005)
Skype. Online link, http://www.skype.com
Yu, J., Choi, S., Lee, J.: Enhancement of VoIP over IEEE 802.11 WLAN via Dual Queue Strategy. In: Proc. IEEE ICC, Paris, France (June 2004)
Park, E.-C., Kim, D.-Y., Choi, C.-H., So, J.: Improving Quality of Service and Assuring Fairness in WLAN Access Networks. IEEE Trans. Mobile Comput. 6(4), 337–350 (2007)
Zhai, H., Chen, X., Fang, Y.: A Call Admission and Rate Control Scheme for Multimedia Support over IEEE 802.11 Wireless LANs. Springer Wireless Networks 12(4), 451–463 (2006)
Mangold, S., Choi, S., Hiertz, G.R., Klein, O., Walke, B.: Analysis of IEEE 802.11e for QoS Support in Wireless LANs. IEEE Wireless Commun. Mag. 10(6), 40–50 (2003)
Choi, S., del Prado, J., Shankar, S.N., Malgold, S.: IEEE 802.11e Contention-Based Channel Access (EDCF) Performance Evaluation. In: Proc. IEEE ICC, Anchorage, Alaska, USA (May 2003)
Xiao, Y., Li, H., Choi, S.: Protection and Guarantee for Voice and Video Traffic in IEEE 802.11e Wireless LANs. In: Proc. IEEE INFOCOM 2004, Hong Kong (March 2004)
Wi-Fi Alliance. Online link, http://www.wi-fi.org
Gao, D., Cai, J., Foh, C.H., Lau, C.-T., Ngan, K.N.: Improving WLAN VoIP Capacity Through Service Differentiation. IEEE Trans. Veh. Technol. 57(1), 465–473 (2008)
Perros, H.G., Elsayed, K.M.: Call admission control schemes: A review. IEEE Commun. Mag., 82–91 (November 1996)
Park, S., Kim, K., Kim, D.C., Choi, S., Hong, S.: Collaborative QoS Architecture between DiffServ and 802.11e Wireless LAN. In: Proc. IEEE VTC 2003 Spring, Jeju, Korea (April 2003)
Collins, D.: Carrier Grade Voice over IP, 2nd edn. McGraw-Hill, New York (2002)
Yu, J., Choi, S.: Comparison of Modified Dual Queue and EDCA for VoIP over IEEE 802.11 WLAN. European Trans. Telecomms. 17(3), 371–382 (2006)
Cali, F., Conti, M., Gregori, E.: Dynamic Tuning of the IEEE 802.11 Protocol. IEEE/ACM Trans. Networking 8(6), 785–799 (2000)
Cai, L.X., Shen, X., Mark, J.W., Cai, L., Xiao, Y.: Voice Capacity Analysis of WLAN With Unbalanced Traffic. IEEE Trans. Veh. Technol. 55(3), 752–761 (2006)
The Network Simulator – ns-2, http://www.isi.edu/nsnam/ns/
Intersil, HFA3861B; Direct Sequence Spread Spectrum Baseband Processor (January 2000)
Johnson, D.B., Maltz, D.A.: Dynamic Source Routing in Ad Hoc Wireless Networks. In: Imielinski, Korth (eds.), vol. 353. Kluwer Academic Publishers, Dordrecht (1996)
Kamerman, A., Monteban, L.: WaveLAN-II: A High-Performance Wireless LAN for the Unlicensed Band. Bell Labs Technical Journal 2(3), 118–133 (1997)
ITU-T Recommendation G.107, The E-model, a computational model for use in transmission planning (December 1998)
Markopoulou, A.P., Tobagi, F.A., Karam, M.J.: Assessing the Quality of Voice Communications over Internet Backbones. IEEE/ACM Trans. Networking 11(5), 747–760 (2003)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering
About this paper
Cite this paper
Yu, J., Choi, M., Qiao, D., Choi, S. (2009). Supporting VoIP Services in IEEE 802.11e WLANs . In: Bartolini, N., Nikoletseas, S., Sinha, P., Cardellini, V., Mahanti, A. (eds) Quality of Service in Heterogeneous Networks. QShine 2009. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 22. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10625-5_31
Download citation
DOI: https://doi.org/10.1007/978-3-642-10625-5_31
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-10624-8
Online ISBN: 978-3-642-10625-5
eBook Packages: Computer ScienceComputer Science (R0)