37 dB level. Therefore, values of alpha < 1 should be used together with higher P _PUSCH values in order to compensate the impact of fractional path-loss compensation. The UE transmission power as a function of combined fractional path-loss compensation and different PO_PUSCH values is shown in Figure 13.13. When varying P PUSCH and alpha (a) values the maximum UE transmission power is reached at path loss 124 dB with PO_PUSCH = -100 dBm and alpha (a) = 1 but at path loss 138 dB with PO_PUSCH = -60 dBm and alpha (a) = 0.6. This means that in case of large cells for Alpha = 1, P Alpha = 1, P  - 8 Alpha = 1, I =-90 Alpha = 1,1 -100 Alpha = 1, P0 =-105 Alpha =1, P0 -110 Path loss (dB) Figure 13.11 UE transmission power as a function of path loss, fixed alpha (a) and varying PO_PUSCH Capacity Optimization Alpha .7,Po=-100 Alpha = Po==100 Alpha = 0.9, P0 = -100 Alpha = Po==100 Path loss (dB) Figure 13.12 UE transmission power as a function of path loss, fixed PO_PUSCH and varying alpha (a) which the max path loss is, for example, 124 dB it is better from performance point of view to use conservative power control settings PO_PUSCH = -100 dBm and alpha (a) = 1 as then at the cell edge UE transmission power is at maximum (21 dBm) compared to PO_PUSCH = -80 dBm and alpha (a) = 0.8 with cell edge UE transmission power of 19.2 dBm. Too low UE transmission power allocation for the cell edge users can cause RRC setup failures due to missing RRC Setup Complete message (message 5), as explained in Section 13.3.2, and poor uplink throughput for cell edge users. However, open-loop power control settings where UEs close to the cell edge start to use maximum power would cause unnecessary inter-cell interference for cell edge users (many UEs transmitting with maximum power). Therefore, during mass events it is recommended to set the open-loop power control part according to the cell edge path loss SO that the UE transmission power is set as low as possible without sacrificing the call setup related signalling performance. Typically