¡@
Journal of Information Science and Engineering, Vol. 24 No.
4, pp. 1003-1022 (July 2008)
Design of QoS and Admission Control for VoIP Services Over IEEE 802.11e WLANs
Pei-Yeh Wu, Jen-Jee Chen, Yu-Chee Tseng and Hung-Wei Lee
1Department of Computer Science
National Chiao Tung University
Hsinchu, 300 Taiwan
E-mails: {phwu; chencz; yctseng}@csie.nctu.edu.tw
2Department of Information and Computer Engineering
Chung Yuan Christian University
Chungli, 320 Taiwan
3ZyXEL Communications Corp.
Hsinchu, 300 Taiwan
E-mail: hewitt.lee@zyxel.com.tw
Supporting telephone services using wireless LAN as the access network is an important
application nowadays. The SIP and IEEE 802.11e are the two most promising
protocols to support such services. In this paper, we show how to integrate SIP and
802.11e to conduct call admission control and resource reservation to support VoIP¡¦s
QoS in IEEE 802.11e WLANs. Besides, we also suggest some adjustments and MAC
enhancements to 802.11e to facilitate VoIP traffics over WLANs.
Keywords:
call admission control, IEEE 802.11e, quality of service (QoS), voice over IP
(VoIP), wireless network
Retrieve PDF document (200807_01.pdf)
Received October 13, 2006; revised January 22, 2007; accepted March 14, 2007.
Communicated by Jenq-Neng Hwang.
*A preliminary version of this paper was presented in [1]. This research was partially supported by Taiwan
MoE ATU Program and by NSC grants No. 93-2752-E-007-001-PAE, 96-2623-7-009-002-ET, 95-2219-E-
009-007, and 94-2219-E-007-009, by Zyxel Communications Corp., by MOEA under grant No. 94-EC-17-
A-04-S1-044, and by ITRI, Taiwan.