The demand of mobile communication has grown remarkably in past years. Mobilerncommunication network (system) should use limited resources in efficient and convenientrnmanner. One way of achieving this is to use smaller cells in the expense of therncorresponding handover management and system administration overhead. The limitedrnradio frequency spectrum available cannot be longer support the increasing number ofrnmobile user, and user demand, and the required quality of service (QoS) no longer arernattainable if a best solution is not found.rnThe other simplest solution proposed to overcome this problem is to increase the networkrncapacity, which is not economical and not really practical. The work in this thesisrndemonstrates the different types of channel allocation schemes and call admission controlrnwith handover management for voice call. This paper goes through the cellular capacityrnimprovement: cell reuse, cell splitting cell tiering and cellular structure. Most of thernproposed schemes in the literature give priority to ongoing (handover) calls on the expensernof blocking the originating calls.rnWe deem to introduce a new bandwidth reservation scheme based on guard channel policy.rnAccordingly, new calls are blocked if the amount of occupied bandwidth is greater or equalrnto a bandwidth threshold; Bt. The novelty of the proposed Time Threshold Based Schemern(TTBS) is based on the elapsed real time of voice handover call and according to a timernthreshold, Tr parameter, handover calls could be either prioritized or treated as new calls.rnThe major contribution of this work is to exploit time threshold scheme to performrnautonomous and intelligent negotiation to improve wireless resource allocation. We usernsimulation study to evaluate the performance of the proposed scheme. The TTBS scheme isrnsimulated under different scenarios and the result show that, the proposed schemes providerngood performance in terms of handover call dropping probability, new call blockingrnprobability, and bandwidth utilization