As CDMA is to be used for the third generation wireless networks to provide integrated services, it is important to study how the quality of service, such as packet loss and delay, should be guaranteed. To accomplish this, we develop a cell-wise model in which user's resource consumption is characterized, and the constraint between system bandwidth and resource consumptions of users is given. This model incorporates important factors that affect user's quality of service, including the aggregation of user traffic, user the power constraint, path loss and interference. Based on this model, we develop an admission control procedure. We further study transmission schemes using one and two channels. Numerical results show the two-channel scheme can have more users admitted, especially under heavy interference from other cells and when users' traffic is bursty.
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