translates into a slightly lower grade of service (i.e. lower throughput) but not significant enough to have a major impact on the service area. Also, depending on the link balance, the mobile may use 2 dB higher transmitter power in the uplink, controlled by open loop power control. Finally, the 2 dB APD applies only when the TRX is set to maximum output power. If the entire TRX is set to the second highest output power, there is no difference between the average power of 8-PSK and GMSK signals. 2. Impact to the overall C/I. The overall impact on C/I to other users will be reduced since the 8-PSK timeslots will produce 2 dB lower average signal levels. This will 'improve' the performance of neighbouring voice and data users. However, at a maximum power of 8-PSK, the served user will have a 2 dB worse C/I SO there is a higher probability of performance degradation experienced over the larger boundary zones, depending on the average C/I for the service area. Incremental redundancy and link adaptation minimize this degradation. 3. Impact to other subscribers (i.e. voice, BA list and HO evaluations). Other mobiles trying to evaluate BCCH will measure up to 2 dB lower signal strength, which is within the tolerance level for evaluating neighbours in the BA list. This has some small impact on cell selections and reselections. Adjusting the cell reselect hysteresis (CRH) high enough can be used to minimize unnecessary cell reselections. The duty cycle of 8-PSK to GMSK on any given radio timeslot (RTSL) will be at most about 92% due to the 52 multiframe structure of a PDTCH (packet dedicated transmission channel) timeslot (which includes 2 X PTCCHs (packet transmission control channels) and 2 X idle bursts). Considering this and the fact that all PACCH (packet associated control channel), RLC signalling blocks, and dummy RLC blocks are in GMSK, the overall impact of APD across a given burst period will be minimised. Radio Network Planning and Optimisation (147 bits) 10 us 8 us 10 us 7056/13 (542.8) us 10 us 8 us 10 us Fi