if the threshold is exceeded then the user would likely be producing too much interference for a neighboring cell and 16 qam is not available to that user the user then moves to a qpsk scheme beginning with process 206 if the pl does not exceed the threshold process 203 determines the power p that is necessary to produce the required cinr for 16 qam process 204 then determines if the required p exceeds the maximum allowed transmission power pmax 1 for zone 1 the user this second determination may be made only based on the new user 39 s required p or may be made using the transmission power of other users in the cell using information about other users could reduce the aggregate interference from one cell to another at times of heavy usage by a particular base station thus zone 1 may be defined using dynamic criteria including the number of other active users and the total radiated power if the pmax 1 level is exceeded then 16 qam is not available to that user and the user moves to qpsk this is similar to the result of process 202 described above as shown in fig2 zone 1 is defined by both pl and p passing two threshold tests if either fails the zone 1 boundary moves to exclude the new user placing the new user in a lower interference and lower capacity zone note that some or.