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A Semi-Soft Handoff Mechanism with Zero Frame Loss in Wireless LAM Networks  

김병호 (LG CDMA단말사업부 S/W개발실)
민상원 (광운대학교 전자통신공학과 통신프로토콜연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.12B, 2003 , pp. 1135-1144 More about this Journal
Abstract
In this paper, we proposed a semi-soft handoff mechanism to provide link mobility in IEEE 802.11 wireless LAN environment. Buffers and routing tables in APs and portals are provided in order to reroute frames, which have not been received during handoff time and have been buffered in an old AP, to a new AP after handoff is performed. For the re -routing operation, the MAC routing table should be updated by exchanging information of a mobile terminal between neighbor APs. With our proposed scheme. a wireless LAN node can perform semi soft handoff while changing its attached AP and provide mobile IP and/or real time service like voice over IP. Also, we have done simulation for evaluation of the performance of the proposed scheme. We show that our semi soft handoff mechanism can be applied for real-time service with no frame loss in mobile environment.
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