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Adaptive bandwidth reservation in wireless cellular networks is expected to ensure bounded call level QoS when network conditions such as new call arrival rates or users' mobilities are changing. The feature of the event based adaptive bandwidth reservation is that bandwidth reservation values are distributed by the target base station to the neighboring base stations upon new call arrivals, handoffs and call terminations. This paper considers the problem of maintaining bounded forced call termination probability under adaptive admission algorithm when the user mobility changes. Our analysis shows that in order to control the forced call termination probability, a bandwidth reservation policy must be imposed on the bandwidth reservation values. Several bandwidth reservation policies have been analysed, and the range of call level QoS has been determined under variable user mobility in all the cases. The analytical results have been validated by simulations.