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In this paper we address the deployment of cooperation in a cellular CDMA environment. In particular, we consider the use of amplify and forward to increase the maximum number of users that can be assigned to each base station. In our scenario, a certain number of fixed relay stations are positioned within the cell: each of them is assigned a group of mobile terminals, whose transmissions are received and retransmitted towards the base station. We study the rule for the assignment of mobile terminals to the fixed relay stations placed in the cell and we investigate the transmission power required by each user in order to reach a given average signal to interference plus noise ratio (SINR) level. We present numerical results quantifying the increased capability of a cell to accommodate users granted by cooperation in terms of coverage range and dropping probability.