r control preamble ends first. The specifications in [11] describe the setting of the uplink DPCCH/DPDCH power difference. 4.3.6.4 Power Control in the PCPCH Message Part and Preamble Message part. The uplink inner or fast loop power control adjusts the UE transmit power to keep the received uplink signal-to-interference ratio (SIR) at a given SIRTARGET set by upper layer outer loop. The network estimates the SIREST of the received PCPCH, then it generates TPC com- mands and transmits the commands once per slot according to the following rule: if SIREST > SIRTARGET then the TPC command to transmit = '0', or if < SIRtarget then the TPC command to transmit = '1'. The UE derives a TPC_cmd for each slot. The UE will support the UTRAN controlled algorithms 1 and 2 to derive a TPC_cmd. These come in step size ATPC and can have values of 1 dB or 2 dB. After deriving the TPC command TPC_cmd using one of the two supported algorithms, the UE adjusts the transmit power of the uplink PCPCH in steps of TPC dB according to the TPC command. If TPC_cmd = 1, then the transmit power of the uplink PCPCH increases by ATPC dB. If TPC_cmd = -1, then the transmit power of the uplink PCPCH decreases by TPC dB. If TPC_cmd = 0, then the transmit power of the uplink PCPCH remains unchanged. Any power increase or decrease takes place immediately before the start of the pilot field on the PCPCH control channel [11]. 4.3.6.5 Power Control in the Power Control Preamble Part The UE begins the power control preamble using the same power level applied for the CD preamble. The initial power control step size utilized in the power control preamble differs from the one applied in the message part as follows: When inner loop power control algorithm 1 applies to the message part, then the initial step size in the power control preamble = ATPC-init where TPC-init is the minimum value out of 3 dB and 2ATPC, where ATPC is the power control step size used for the message part. The UMTS Network and Radio Access Technology When inner loop power control algo