Abstract: Cell selection and reselection by mobile station in a cellular mobile radio network with a plurality of layers of cells includes, when the station is in a standby state and after selection of a cell by the station, identification of a layer containing the selected cell, reselection of cells in the layer during a predetermined time-delay, cumulative counting of the number of cells reselected in the layer during that time-delay, and comparison of the cumulative number with two thresholds. The reselection, cumulative counting and comparison steps are repeated if the cumulative number is between the thresholds. Otherwise, a change of layer is effected on the basis of the comparison and the previous steps are repeated, starting from the identification step. The mobile station selects the layer most appropriate to the speed at which it is travelling.

Abstract: In a radiotelephonic process for locating mobile subsribers, a profile is created from data recorded in a recording means in the form of a first work file and obtained during the movements of a particular mobile subscriber during a first predetermined observation period, the data relates to a plurality of daily chronological periods spanning the first observation period and each period has a start determined by the time at which the mobile subscriber entered a location zone with a particular daily identity, and an end determined by the time at which the mobile subscriber left the location zone and entered another location zone with a different identiy. There is also disclosed a radiotelephonic installation for carrying out the process.