Abstract: A radio system including at least one local exchange (MX); a radio network having fixed radio stations (BS) located apart from each other and connected to the local exchange; and at least one mobile radio station (MS) capable of roaming freely within the area of the radio network and informing the radio network of its location by selecting one of the fixed radio stations (BS) in accordance with a predetermined selection procedure and sending to the base station a registration message which is forwarded to the local exchange (MX). The mobile radio station (MS) provides the registration messages with information indicating the order of transmission of the messages, on the basis of which information the radio network determines the order of transmission of successive registration messages of the same mobile radio station.