Method for establishing a connection with a mobile subscriber and system for implementing the method

• US 4,672,655 A
• Filed: 12/10/1984
• Issued: 06/09/1987
• Est. Priority Date: 12/08/1983
• Status: Expired due to Fees

• Current Assignee: Ant Nachrichtentechnik GmbH
• Original Assignee: Ant Nachrichtentechnik GmbH
• Inventors: Koch, Harry
• Primary Examiner(s): Lev, Robert
• Application Number:
  US06/680,082
• Time in Patent Office: 911 Days
• Field of Search: 179/2 E, 179/2 EA, 179/2 EB, 179/2 EC, 179/18 BF, 455/12, 455/13
• US Class Current: 455/427
• CPC Class Codes: H04B 7/18558 Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
• CPC Class Codes: H04W 68/10 using simulcast notification

Abstract

To establish a connection between a stationary subscriber connected to a telephone system and a mobile subscriber, call signals are transmitted via a call center, an earth radio station and a satellite to a plurality of transceivers distributed over an area. From at least one of these transceivers the call signals are transmitted to the mobile subscriber. This avoids annoying changes in delay in modulation offering trunks which are now no longer required between the call center and the transceivers as well as interference produced by such changes in delay in the simultaneous reception by two adjacent transceivers. All transceivers can therefore operate at the same carrier frequency and simultaneously.

Claims

1. In a method for establishing a connection between a stationary subscriber connected to a telephone system and a mobile subscriber equipped with a radio receiver, wherein said stationary subscriber dials a call center connected with the telephone system, giving the subscriber number of the desired mobile subscriber, said call center relays the desired subscriber number to a ground radio station from where it is directionally transmitted to a satellite, said satellite retransmits the desired subscriber number to the ground, and the radio receiver of the desired mobile subscriber, after receiving its own subscriber number, emits an alarm signal to the mobile subscriber;

the improvement comprising;

providing a plurality of stationary transceivers distributed over the terrestrial area covered by the signal transmitted by the satellite, with said transceivers receiving and then retransmitting said desired subscriber number; and

wherein the radio receiver of the desired mobile subscriber receives the signal containing its subscriber number from one of said stationary transceivers.

2. The method as defined in claim 1 wherein:

said stationary subscriber also supplies its own subscriber number to said call center; and

further comprising;

transmitting said subscriber number of said stationary subscriber, together with said desired subscriber number, via the ground radio station, the satellite and the plurality of transceivers; and

, displaying said subscriber number of the calling said stationary subscriber in the radio receiver of the desired said mobile subscriber.

3. A method as defined in claim 2 wherein said desired mobile subscriber has a mobile telephone;

and further comprising establishing a telephone connection between the desired said mobile telephone subscriber and said stationary calling subscriber by using the received said subscriber number of said stationary subscriber at said desired mobile subscriber to establish a telephone connection between said desired mobile subscriber and said telephone system over a separate terrestrial radio connection.

4. A method as defined in claim 3 wherein, said satellite transmits its signal to all of said transceivers located in the area covered by the satellite at one and the same carrier frequency.

5. A method as defined in claim 4, wherein at least three of said transceivers, each supplying mutually adjacent local areas, transmit by simultaneous broadcasting.

6. A method as defined in claim 5 wherein said at least three of said transceivers transmit at the same carrier frequency which is different than said carrier frequency of the satellite.

7. A method as defined in claim 1 wherein, said satellite transmits its signal to all of said transceivers located in the area covered by the satellite at one and the same carrier frequency.

8. A method as defined in claim 7, wherein at least three of said transceivers, each supplying mutually adjacent local areas, transmit by simultaneous broadcasting.

9. A method as defined in claim 8 wherein said at least three of said transceivers transmit at the same carrier frequency which is different than said carrier frequency of the satellite.

11. A system as defined in claim 9 wherein at least three of said transceiver means are provided, each transmitting at the same carrier frequency.

10. A system for establishing a connection between a stationary subscriber location connected to a telephone system and a desired one of a plurality of mobile subscribers comprising in combination:

a mobile radio receiver for each mobile subscriber, with each said mobile radio receiver including an alarm signal generator means which is responsive to its own subscriber signal number for emitting an output signal;

a stationary telephone system including at least one call center, which is connected with a ground radio system, for the transfer of calls;

means, at said stationary subscriber station, for supplying the subscriber call signal number of a desired mobile subscriber to said call center via said telephone system;

relay satellite means for receiving call signals transmitted by said ground radio system and for retransmitting the received call signals over a covered terrestrial area; and

a plurality of transceiver means, distributed over said area covered by the transmitted signal from said satellite means, for receiving the call signals transmitted by said satellite means and for retransmitting same to said mobile radio receivers, whereby said mobile radio receivers receive said call signals from said satellite means only indirectly via said transceiver means.

12. A system as defined in claim 10 wherein said satellite means transmits at the same carrier frequency to all of said transceiver means, with said carrier frequency of said satellite means being different than said carrier frequency of the transmitted signals from said transceiver means.