A base station and a method therein are provided for supporting pilot channel selection for a mobile station. A base station has disposal of at least two pilot channels in its cell, and determines pilot channel(s) out of the pilot channels suitable to use for the mobile station. If the determined pilot channel(s) is not currently being used by the mobile station, then the base station starts to transmit the determined pilot channel(s) signals to the mobile station and receives a confirmation from the mobile station confirming their use. If the mobile station was using another pilot channel of the pilot channels than the determined pilot channel(s) and if no other mobile station is using the other pilot channel, then the base station terminates transmission of the other pilot channel.