Survey of Vertical Handoff Models in Heterogeneous Wireless Networks

B.G. Kim and Hengky Susanto Hwang S. Lee Computer Science Dept. Electrical Eng. Dept. Univ. of Mass. Lowell KAIST {kim, hsusanto}@cs.uml.edu hwanglee@ee.kaist.ac.kr Abstract A vertical handoff technique switches a mobile station among wireless networks with different technologies. Since a different network may not support the same QoS, the vertical handoff technique has to consider user QoS. A few vertical handoff models are described and compared in this paper. The focus of comparison is placed on objectives of the models and handoff parameters considered for the models. All models are based on a cost or a score function, which is formulated to reflect desirable QoS connections. All functions involve some type of weighting factors in incorporating various QoS parameters. Weighting factors are an important component in the decision model and most of studies use empirical data.

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