1. A method for uplink channel estimation in a wireless communication system applying transmit power control, the method comprising: providing a channel state model in a channel estimator; obtaining, in said channel estimator, a measured and demodulated received uplink radio signal of a present time slot; estimating channel states of said present time slot, in said channel estimator, by tracking said demodulated uplink radio signal with said channel state model; obtaining a series of transmit power control commands issued for controlling a transmit power of said uplink radio signal; estimating a delay, in units of time slots, between a time a transmit power control command is issued by a base station and a time that the transmit power control command is applied by a user equipment, said delay being based on the measurements of said demodulated received uplink radio signal and the series of transmit power control commands, wherein estimating the delay comprises: registration of relative powers of consecutive slots of received uplink radio signals and correlating said relative powers to a series of transmit power control commands; and adapting channel states of said channel state model before said step of estimating channel states based on a transmit power control command of said series of transmit power control commands compatible with said estimated delay.