Method of automatically establishing telephone connection to and from mobile radiotelephone stations

Claim 1

A method of automatically establishing telephone connections to and from mobile radiotelephone stations through duplex channels with fixed stations in a radio system, in which speech channels of the local regions of operation are arranged in groups of channels with a characteristic idle signal identifying each channel group, and in which a connection within such a region from a fixed station to a mobile station is established by a selective call through a single exclusive calling channel of the same frequency for all the mobile stations in the whole radio system and different from any of the voice channel frequencies, the carrier of which calling channel is emitted only temporarily for the selective call and a channel command, and in which a connection from the mobile station is established through a free speech channel by a transmission of the station identification and the subscriber''s number desired, characterized in that the information to the mobile station on the calling channel (selective call, channel command), the identification of the speech channels and of the channel groups (idle signal) and the clearing from the mobile station, and also the information from the mobile station (identification, desired subscriber''s number) are stored as a series of digits in fixed or adjustable registers in fixed and mobile stations, that these stored series of digits are modulated on the corresponding high frequency carrier of the fixed station or the mobile station in the required sequence in accordance with a coding method which is the same for all kinds of information and at voice frequencies which are the same for both directions of traffic, and in that the fixed station in response to the reception of identifying pulses from a calling mobile station reemits this identification, and in that means are provided in each of the mobile stations for switching to a channel different from the channel assigned to the calling mobile station in response to the retransmission by the fixed station of mobile station identification other than that assigned to a mobile station.

Claim 2

A method of automatically establishing telephone connections to and from mobile radiotelephone stations through duplex channels with fixed stations in a radio system, in which speech channels of the local regions of operation are arranged in groups of channels with a characteristic idle signal identifying each channel group, and in which a connection within such a region from a fixed station to a mobile station is established by a selective call through a single exclusive calling channel of the same frequency for all the mobile stations in the whole radio system and different from any of the voice channel frequencies, the carrier of which calling channel is emitted only temporarily for the selective call and a channel command, and in which a connection from the mobile station is established through a free speech channel by a transmission of the station identification and the subscriber''s number desired, characterized in that the information to the mobile station on the calling channel (selective call, channel command), the identification of the speech channels and of the channel groups (idle signal) and the clearing from the mobile station, and also the information from the mobile station (identification, desired subscriber''s number) are stored as a series of digits in fixed or adjustable registers in fixed and mobile stations, that these stored series of digits are modulated on the corresponding high frequency carrier of the fixed station or the mobile station in the required sequence in accordance with a coding method which is the same for all kinds of information and at voice frequencies which are the same for both directions of traffic, and in that the fixed station in response to the reception of identifying pulses from a calling mobile station reemits this identification, and in that means are provided in each of the mobile stations for switching to a channel different from the channel assigned to the calling mobile station in response to the retransmission by the fixed station of mobile station identification other than that assigned to a mobile station.