Theoretical Studies on the Service Quality Evaluation and Optimal Resource Allocation in Mobile Communication Networks

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(1) Methodology for calculating the requires spectrum for the next generation mobile radio communication systems Our proposal of the methodology and calculation results for estimating the spectrum requirements in IMT-Advanced systems was approved and accepted in the 2007 World Radiocommunication Conference. We have published the technical background and our research work in a book entitled Spectrum Requirement Planning in Wireless Communications from John Wiley and Sons (248 pages), 2008. Afterwards, we have developed a method that improves the spectrum usage, and calculated its effects based on a queuing model and simulation.(2) Calculation of the number of handovers and its application in cellular mobile communication networks In cellular mobile communication systems, the handover control is necessary when a mobile terminal moves from one cell to another for the channel allocation and location management. We have developed a theoretical model for estimating the number of handovers during one communication session using the theories of geometric probability and renewal process. The model has been applied to determine the optimal data update time for location management at the base stations in cellular mobile networks.(3) Models for evaluating the effects of time-varying traffic load on the performance of communication channels. Dynamic allocation of spectrum resource is desirable in future radio communication systems. Therefore, we have studied the time-dependent process in relevant stochastic models. We have also obtained an explicit expression for the probability density function of a busy period duration in a queue with a finite waiting room.