A method of categorising speed of a terminal (202) in a wireless communications network (116) comprises monitoring a first factor associated with allocation of a radio-frequency (RF) resource that is not related to mobility of the terminal (202). The first factor is then offset against a second factor, the second factor being potentially indicative of mobility of the terminal (202). The speed of the terminal (202) is then approximated using the result of offsetting the first factor against the second factor.