Figure 13.13 UE transmission power as a function of path loss when varying PO_PUSCH and alpha (a) values LTE Small Cell Optimization (i))+Po_ PUSCH (i)+f(i)} PO_PUSCH=Po_PRE+APREAMBLE_Msg3 f(0) = =APrampup++mmgg2 Figure 13.14 3GPP Release 8-defined uplink transmission power control algorithm for message 3 power on PUSCH The closed-loop power control, f(i) in Figure 13.10, is updated by the UE based on the TPC command sent by the eNodeB. In [2] it is specified that closed-loop power control part, f(i), can be either accumulation or absolute type. In case of accumulation type the previous value of f(i), that is, f(i-1) is summed together with the new TPC command from the eNodeB and in case of absolute type only the new TPC command from the eNodeB is used to update f(i). The accumulation-type TPC command is {-1, 0, 1, 3} dB and absolute type TPC command is {-4, 1, 1, 4} dB. The accumulation-type closed-loop power control always starts from the initial value, f(0), and then adjusts that initial value based on the eNodeB TPC commands from the eNodeB. The absolute closed-loop power control only uses the current TPC com- mand from the eNodeB and replaces the closed-loop power control, f(i), value with the new received one. The initial value, regardless of closed-loop power control type selected to be used, f(0), is given in [2] as a sum of TPC command given in the random access response, 8msg2, and total preamble transmission power ramp-up, AP rampup' from the first to the last (acknowledged random access response) preamble. The RRC connection request message, message 3, sent by the UE is the first message sent on PUSCH and therefore is the transmission that uses the initial value, f(0), for closed-loop power control. Message 3 total transmission power is as given in Figure 13.10 with modifications according to [2] as shown in Figure 13.14. The preamble power ramp-up is also increasing the message 3 uplink transmission power and in case of accumulation-type closed-loop power control the preamble power ramp-up impacts th