The initial power on the PRACH - the power of the first preamble - is determined according to equation
P_PRACH = L_PCPICH + RTWP + constantValueCprach
Where L_PCPICH is the path loss estimated by UE since it knows transmit & receive CPICH power RTWP is received Total Wideband Power(uplink interference) measured by RBS .
constantValueCprach is used by the UE to calculate the initial power on the PRACH . This parameter is configurable and decides at which level below RTWP preamble ramping will start.
Download UMTS KPI Introduction Doc
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