A method of estimating a received uplink signal power of a first transmission channel at a receiving node in a communications system, wherein the receiving node is a base station, wherein a received signal (200; 705) comprises information transmitted by a transmitting node over at least two transmission channels, wherein the transmitting node is a mobile station, the method characterised by: measuring the received uplink signal power of a second or further of the at least two transmission channels; estimating a relationship between the transmission power of the second or further transmission channel and the transmission power of the first transmission channel; and estimating (315; 410) the received uplink signal power of the first transmission channel using the measurement of the received uplink signal power of the second or further transmission channel and said estimated relationship, wherein the step of estimating a relationship comprises estimating the ratio of the transmission power of the second or further transmission channel to the transmission power of the first transmission channel, thereby obtaining a scaling factor of the second or further transmission channel; and the step of estimating the received uplink signal power of the first transmission channel is performed by applying said scaling factor of the second or further transmission channel to the measured value of the received uplink signal power of said second or further transmission channel, thereby obtaining a channel specific estimator of said second or further transmission channel, and by estimating the received uplink signal power of the first transmission channel in dependence on said channel specific estimator in estimating, wherein the method further comprises receiving, from the transmitting node, the ratio of the transmission power of the second or further transmission channel to the transmission power on the first transmission channel at at least one previous point in time; and determining the scaling factor of said second or further transmission channel in dependence on said ratio at at least one previous point in time. measuring the received uplink signal power of a second or further of the at least two transmission channels; estimating a relationship between the transmission power of the second or further transmission channel and the transmission power of the first transmission channel; and estimating (315; 410) the received uplink signal power of the first transmission channel using the measurement of the received uplink signal power of the second or further transmission channel and said estimated relationship, wherein the step of estimating a relationship comprises estimating the ratio of the transmission power of the second or further transmission channel to the transmission power of the first transmission channel, thereby obtaining a scaling factor of the second or further transmission channel; and the step of estimating the received uplink signal power of the first transmission channel is performed by applying said scaling factor of the second or further transmission channel to the measured value of the received uplink signal power of said second or further transmission channel, thereby obtaining a channel specific estimator of said second or further transmission channel, and by estimating the received uplink signal power of the first transmission channel in dependence on said channel specific estimator in estimating, wherein the method further comprises receiving, from the transmitting node, the ratio of the transmission power of the second or further transmission channel to the transmission power on the first transmission channel at at least one previous point in time; and determining the scaling factor of said second or further transmission channel in dependence on said ratio at at least one previous point in time.