A Seamless Vertical Handover Approach

Authors:
Rastin Pries;Dirk Staehle;Phuoc Tran-Gia;Thorsten Gutbrod
Affiliations:
Institute of Computer Science, University of Würzburg, Germany;Institute of Computer Science, University of Würzburg, Germany;Institute of Computer Science, University of Würzburg, Germany;Institute of Computer Science, University of Würzburg, Germany
Venue:
Wireless Systems and Mobility in Next Generation Internet
Year:
2008

Citing 7
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Abstract

Today, wireless network devices are equipped with multiple access technologies like UMTS andWireless LAN. The handover between the technologies has been widely studied in literature. Several of these research papers build their handover mechanisms on top of existing protocols like Mobile IP. These protocols operate on the network layer and recognize link layer changes only by timeouts. Consequently, if no cross layer approach is implemented, a seamless vertical handover between Wireless LAN and UMTS cannot be provided. In this paper, we introduce a vertical handover protocol based on a tightlycoupled network architecture. With this architecture, it is possible to perform the handover on the link layer and thus, reducing the handover delays. The protocol is implemented in a simulation environment and the results reveal that a seamless vertical handover can be performed with blackout times of only a few milliseconds.