Adaptive Bandwidth Reservation and Admission Control in QoS-Sensitive Cellular Networks

How to keep the probability of hand-off drops within a prespecified limit is a very important Quality-of-Service (QoS) issue in cellular networks because mobile users should be able to maintain ongoing sessions even during their hand-off from one cell to another. In order to keep the hand-off dropping probability below a prespecified target value (thus providing a probabilistic QoS guarantee), we design and evaluate predictive and adaptive schemes for bandwidth reservation for the hand-offs of ongoing sessions and the admission control of new connections. We first develop a method to estimate user mobility based on an aggregate history of hand-offs observed in each cell. This method is then used to probabilistically predict mobiles' directions and hand-off times in a cell. For each cell, the bandwidth to be reserved for hand-offs is calculated by estimating the total sum of fractional bandwidths of the expected hand-offs within a mobility-estimation time window. Three different ad...

• Type: Journal
• Year: 2002
• Where: TPDS
• Authors: Sunghyun Choi, Kang G. Shin
• Keywords: Bandwidth Reservation, Cell, Ongoing Sessions, TPDS 2002