In a wireless communication system, a network initiates a radio bearer reconfiguration procedure by sending an RADIO BEARER RECONFIGURATION message to a user equipment. Then, the network initiates an active set update procedure by sending an ACTIVE SET UPDATE message to the user equipment. When detecting an inconsistency in the E-DPDCH power interpolation information elements indicated in the RADIO BEARER RECONFIGURATION message and the ACTIVE SET UPDATE message, the user equipment computes a first gain factor using an extrapolation formula. When unable to transmit data based on the first gain factor, the user equipment computes a second gain factor using an interpolation formula. If the data cannot be transmitted based on the second gain factor, the user equipment notifies the network of an unsuccessful radio link.