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Location information is a valuable tool in personal communicationover IP (VoIP) and video streaming can be made available in wireless networks. At the same time, using information uniquely available in wireless networks, we will be able to create novel applications that are unavailable in traditional networks. Location is one example of this type of information, which enables such applications as iLocator [5] for tracking buddies or searching services in a certain area.The trend toward convergence may also change the ways that users communicate. Typically, users must initiate communications by keying in the information required to specify the identity of the message

In this paper, we propose and analyze a preemption based admission control policy for an integrated voice and Voice Message Service (VMS) CDMA system.Granted with the priority, the performance of voice calls is not affected by VMS. A multicode scheme is used for VMS traffic to transmit on multiple spreading codes in parallel.The SIR constraints of voice and VMS calls are taken into account to identify the system capacity. By using a two-dimensional Markov model, the performance of the integrated system is evaluated Under different system traMic loads, QoSbased system capacities are obtained and optimal coding schemes for VMS are specified. Finally, the effect of the VMS buffer size is discussed.

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