Abstract
Channel reservation techniques have been widely studied in cellular networks in order to meet the desired Quality of Service (QoS) requirements. In this paper, a distributed predictive channel reservation scheme, called the road-map-based channel reservation scheme (RMCR), and a call admission control algorithm are proposed. The goal is to reduce the handoff dropping probability and to improve the bandwidth utilization. In the RMCR scheme, we assume that the base stations are equipped with road-map information and that the mobile stations are equipped with Global Position System (GPS) devices. The mobile stations periodically report their GPS location information to their base stations. Based on the location information of the mobile stations at two consecutive epochs, the base stations estimate the speed and the moving direction of the mobile stations. Furthermore, the base stations estimate the probability that the mobile stations enter the neighboring cells based on their velocity and the road-map information stored in the base stations. The base stations then compute the amount of bandwidth to be reserved based on this probability. With the road map information, the base stations can make more accurate prediction on the users' mobility and hence reduce unnecessary bandwidth reservations.