| Summary: | 碩士 === 國立交通大學 === 資訊科學學系 === 86 === In Personal Communication Services (PCS), the network tracks the
locations of the mobile stations so that incoming calls can be
delivered to the target mobile stations. At present, a two-level
mobility database system is extensively used to store location
information of the mobile stations. In this paper, we aim to
investigate how to meet real-time requirements for the mobility
database system. Under some assumptions, a set of experiments
have been conducted to evaluate the performance of various real-
time scheduling policies. Based on the experimental results, the
following suggestions are given for PCS provider to design a
high-performance mobility database system. 1) The evaluated
real-time scheduling policies have significant impact on
improving the performance. 2) Increasing power of HLR can
obviously improve the performance. 3) Giving remote accesses
higher priority to enter the system can decrease the effect of
overload spreading by the bottleneck site. 4) Memory resident
databases make little contribution to improving the performance.
5.) Mobility rate of mobile stations seriously affects the
performance.
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