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Issue No.06 - November/December (2005 vol.4)
pp: 630-640
In this paper, we propose a mobile terminal (MT) location registration/update model. In this model, the registration decision is based on two factors—the time elapsed since last call arrival and the distance the MT has traveled since last registration. It is established that the optimal registration strategy can be represented by a curve. Only when the state of the system reaches this curve is a registration performed. In order for an MT to calculate its traveled distance, an interactive implementation scheme and a distance calculation algorithm are developed. When the call interarrival times are independent and geometrically distributed, the proposed model becomes a distance-based model and, in this case, the optimal registration strategy is of threshold structure. For the distance-based model, a single sample path-based ordinal optimization algorithm is devised. In this algorithm, without any knowledge about the system parameters, the MT observes the system state transitions, estimates the ordinal of a set of strategies, and updates the registration strategy adaptively. Since only a single sample path is used, this algorithm can be implemented online. Several numerical examples are provided to compare the proposed model and the existing ones.
Index Terms- Personal communication service system, location registration, Markov decision process, single sample path-based ordinal optimization.
Zikuan Liu, "Dynamical Mobile Terminal Location Registration in Wireless PCS Networks", IEEE Transactions on Mobile Computing, vol.4, no. 6, pp. 630-640, November/December 2005, doi:10.1109/TMC.2005.88
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