A base station reselection method for a mobile terminal camped on a base station, which mobile terminal performs a cell reselection function in accordance with reselection parameters. The method characterized by according a different priority to respective radio resource types and varying the reselection parameters in dependence upon the radio resource type of the base station on which the mobile terminal is camped to cause the mobile terminal to preferentially reselect to a higher priority radio resource type when available. A further base station reselection method includes determining radio characteristics of at least one neighboring base station at a frequency, characterized by varying the frequency at which said radio characteristics are determined in dependence upon the rate of movement of the mobile terminal.