The present invention relates to a method of optimizing the capacity of at least one WCDMA type mobile network (RT) for the creation of at least one additional service (MBMS) whose flow is predominantly downstream, the method being characterized in that it comprises the following steps: - creation (10) of at least one map (CT) of the planned traffic, representative of forecasts of the coverage of the network (RT) and the power required for the use of the services, for at least one planned deployment date (DD) of the network (RT) - calculation (20) of the available power in each of the network (CR) cells (RT) in the absence of transmission diversity then calculation ( 30) of the available power in each of the network (CR) cells (RT) in the presence of transmission diversity - creation (40) of at least one list of the cells requiring the installation of a transmission diversity , as a function of at least a number (N) of channels of the desired service transmission (MBMS) whose flow is predominantly downstream.
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