Hybrid Location-Update Scheme for Mobile Networks

초록

In this paper, we propose a hybrid location-update scheme, which combines the time- and movement-based location-update approaches. In the proposed scheme, a mobile user updates its location after the following two events have occurred: First the mobile crossed n cell boundaries, and then, a time interval T elapsed. We also examine the inverse scheme, where an update is performed after the n boundary crossings occur subsequent to the time interval T. We evaluate our scheme by applying it to various mobility models, such as exponential cell-residence times with a constant mobility pattern, exponential cell-residence times with a gamma-distributed mobility pattern, hyperexponential cell-residence times, and cell-residence times with a small coefficient of variation. From our numerical analysis and simulation results, we learn that the movement-based-only method (i.e., T = 0) performs well when the coefficient of variation of the cell-residence time is relatively small. However, when the coefficient of variation is large, the proposed hybrid scheme (i.e., T > 0, n > 0) outperforms each of the two approaches, namely, the time- and movement-based location-update schemes, when these schemes are individually applied.

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