Browsing by Author "Lee, Hung-Wei"

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A seamless handoff mechanism for DHCP-based IEEE 802.11 WLANs
(2007-08-01)
Chen, Jen-Jee
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Tseng, Yu-Chee
;
Lee, Hung-Wei
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資訊工程學系
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Department of Computer Science
IEEE 802.11 wireless networks have gained great popularity. However, handoff is always a critical issue in this area. In this paper, we propose a novel seamless handoff mechanism for IEEE 802.11 wireless networks which support IEEE 802.11i security standard. Our approach consists of a Dynamic Tunnel Establishing procedure and a seamless handoff mechanism. Both intra- and inter-subnet handoff cases are considered in our seamless handoff approach. Our work focuses on handoffs in DHCP-based IP networks rather than Mobile IP-supported networks, but the proposed scheme can be easily tailored to Mobile IP-supported networks.
Design of QoS and admission control for VoIP services over IEEE 802.11e WLANs
(2008-07-01)
Wu, Pei-Yeh
;
Chen, Jenjee
;
Tseng, Yu-Chee
;
Lee, Hung-Wei
;
資訊工程學系
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.