Se Dong Kwon  Man Yoo Han  Hyun Min Park

Vol. 9,  No. 3, pp. 385-398, Jun.  2002
10.3745/KIPSTC.2002.9.3.385

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To accommodate the increasing number of mobile terminals in the limited radio spectrum, wireless systems have been designed as micro/picocellular architectures for a higher capacity. This reduced coverage area of a cell has caused a higher rate of hand-off events, and the hand-off technology for efficient process becomes a necessity to provide a stable service. Population-based Bandwidth Reservation(PBR) Scheme is proposed to provide prioritized handling for hand-off calls by dynamically adjusting the amount of reserved bandwidth of a cell according to the amount of cellular traffic in its neighboring cells. We analyze the performance of the PBR scheme according to the changes of a fractional parameter, f , which is the ratio of request reservation to the total amount of bandwidth units required for hand-off calls that will occur for the next period. The value of this parameter, f , should be determined based on QoS(Quality of Service) requirement. To meet the requirement the value of Parameter( f ) must be able to be adjusted dynamically according to the changing traffic conditions. The best value of f can be determined by a function of the average speed of mobile stations, average call duration, cell size, and so on. This paper considers the average call duration and the cell size according to the speed of mobile stations. Although some difference exists as per speed, in the range of 0.4 <= f <= 0.6, Blocking Probability, Dropping Probability and Utilization show the best values.