Novel Handoff Frequency Algorithms for Vehicular Area Networks
In the vehicular area networks (VANETs), mobile station will frequently switch the associated base station. Reducing the number of handoff times is an import issue on retaining the quality of connection. In this paper, we propose two algorithms to solve this issue. The first one is named the Longest Distance Algorithm (LDA). We transform the handoff problem as finding the cross points of multiple circles and a line in a graph. The base station whose cross point is closest to the destination will be the candidate. The second one is called as Least Handoff Frequency Algorithm (LHFA). In the LHFA, the base stations are treated as the vertices. The link between two base stations implies mobile station can perform the handoff operation. The LHFA uses the Dijkstra’s shortest path algorithm to optimize the number of handoff times. The simulation results show that both the proposed LDA and LHFA algorithms can greatly reduce the numbers of handoff operations than the signal-strength algorithm.
KeywordsVehicular area networks Handoff Shortest path algorithm Destination greedy algorithm
This work was supported in part by the National Science Council, Taiwan, ROC, under grant NSC100-2221-E-150-087.
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