loop power control adjustments are based on path-loss changes, that is, slow channel variations measured by the terminals. The closed-loop power control is based on the power control commands sent by the eNodeB to try to mitigate any path-loss measurement and power amplifier errors as well as rapid changes in the inter-cell interference conditions. In Figure 13.11 the UE transmission power as a function of path loss is shown. P PUSCH varied, alpha (a) is fixed to 1 and the resource block allocation is 1. As it can be seen 0_PUSCH controls the UE transmission power based on the path loss and the higher the P PUSCH higher is the UE transmission power for a given path loss. With alpha = 1 the UE TPC is LTE Small Cell Optimization Open-loop part Closed-loop part = PUSCH PUSCH (i)+a(j)-PL+4,(i)+fi} Power offset Tx power for PUSCH Number of Cell-specific depending on in subframe i in dBm allocated resource parameter configured PUSCH transport blocks Maximum allowed UE Combination of cell- and by L3 format Downlink Power control adjustment power in this particular UE-specific components path loss derived from TPC cell, max according to configured by L3 estimate by command received in 3GPPTS 36.101 subframe (i-4) Figure 13.10 3GPP Release 8-defined uplink transmission power control for PUSCH, expressed in working as full path-loss compensation and the UE is trying to maintain P0 PUSCH dBm power at the receiver per allocated resource block. Therefore with 0_PUSCH = -60 dBm the max UE transmission power is reached at path loss 83 dB whereas with P PUSCH = -100 dBm the max UE transmission power is reached at 40 dB higher path loss of 123 dB. With fixed PO_PUSCH = -100 dBm and varying alpha values the fractional path-loss com- pensation can be used. Alpha < 1 means that only fraction of path loss is compensated as indicated in Figure 13.12. For example, with alpha = 1 and POSPUSCH = -100 dBm the max- imum UE transmission power is used at path loss 123 dB but with alpha 0.9 maximum UE transmission power is used at 123/0.9 = 1