Methods, satellite user terminals, switching centers and systems for selectively conducting calls in a satellite radiotelephone system as dual HOP calls

• US 6,377,801 B1
• Filed: 08/16/1999
• Issued: 04/23/2002
• Est. Priority Date: 08/16/1999
• Status: Expired due to Fees

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Kolev, Javor, Asokan, Ramanathan
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): Tran, Pablo N
• Application Number:
  US09/374,803
• Time in Patent Office: 981 Days
• Field of Search: 455/427, 455/12.1, 455/121, 455/13.1, 455/13.2, 455/422, 455/428, 455/430, 455/435, 455/440, 455/429, 455/432, 455/433, 455/434, 455/445, 455/456, 455/502, 455/517, 455/466, 370/401, 370/338, 370/323, 370/316, 370/324, 370/310
• US Class Current: 455/428
• CPC Class Codes: H04B 7/18532 Arrangements for managing transmission, i.e. for transporting data or a signalling message

Abstract

Calls in the satellite radiotelephone system are conducted as single or dual hop calls under the control of a satellite radiotelephone that initiates the call. In particular, a first satellite radiotelephone calling a second satellite radiotelephone can configure the call as a dual hop call by transmitting a suspension code to a switching center, thereby possibly avoiding a default action by the switching center to conduct the call a single hop call. The switching center recognizes the suspension code and conducts the call in the active state to the second satellite radiotelephone as a dual hop call. In other words, the suspension code transmitted by the first satellite radiotelephone instructs the switching center to avoid conducting the call as a single hop call which may be the default action performed by the switching center.

Claims

1. A method of conducting a call from a satellite user terminal to a user terminal via a satellite in a satellite radiotelephone system, the method comprising the steps of:

transmitting information from the satellite user terminal to the satellite radiotelephone system via the satellite, wherein the information includes a request to conduct an active state of the call from the satellite user terminal to the user terminal via a ground segment in the satellite radiotelephone system; and

conducting the active state of the call from the satellite user terminal to the user terminal via the ground segment based on the request.

2. The method of claim 1, wherein the step of conducting comprises:

determining whether the user terminal is a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite; and

establishing the active state of the call between the satellite user terminal and the user terminal via the ground segment in response to the request if the user terminal is a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite.

3. The method of claim 2, further comprising the step of:

conducting the active state of the call between the satellite user terminal and the user terminal, wherein the user terminal does not communicate with the satellite directly if the user terminal is not a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite.

4. A method of conducting a call from a satellite user terminal to a user terminal via a satellite in a satellite radiotelephone system, the method comprising the steps of:

transmitting information from the satellite user terminal to the satellite radiotelephone system via the satellite, wherein the information includes a request to conduct an active state of the call from the satellite user terminal to the user terminal via a ground segment in the satellite radiotelephone system, wherein the step of transmitting comprises the step of transmitting information from the first satellite user terminal to the satellite radiotelephone system, wherein the information includes at least one of a suspension code and a suspension message which requests the suspension of default single hop call configuration for the active state of the call; and

conducting the active state of the call from the satellite user terminal to the user terminal via the ground segment based on the request.

5. The method of claim 4, wherein the suspension code comprises at least one of a suffix and a prefix associated with a telephone number the identifies the user terminal in the satellite radiotelephone system.

6. A method of conducting a call from a first satellite user terminal to a second satellite user terminal via a satellite in a satellite radiotelephone system, the method comprising the steps of:

transmitting information from the first satellite user terminal to the satellite radiotelephone system via the satellite, wherein the information includes a request to suspend single hop call configuration by the satellite radiotelephone system and conduct an active state of the call from the first satellite user terminal to the second satellite user terminal via a ground segment in the satellite radiotelephone system;

receiving channel information from the satellite radiotelephone system that identifies a channel over which the first satellite user terminal communicates with the second satellite user terminal during the active state of the call; and

communicating with second satellite user terminal over the channel.

7. The method of claim 6, wherein the step of transmitting comprises the step of transmitting information from the first satellite user terminal to the satellite radiotelephone system, wherein the information includes at least one of a suspension code and a suspension message which requests the suspension of single hop call configuration for the active state of the call.

8. The method of claim 7, wherein the suspension code comprises at least one of a suffix and a prefix associated with a telephone number the identifies the second satellite user terminal in the satellite radiotelephone system.

9. A method of conducting a call from a first satellite user terminal to a second satellite user terminal via a satellite in a satellite radiotelephone system, the method comprising the steps of:

receiving information from the first satellite user terminal via the satellite, wherein the information includes a request to suspend single hop call configuration by the satellite radiotelephone system and conduct an active state of the call from the first satellite user terminal to the second satellite user terminal via a ground segment in the satellite radiotelephone system;

assigning at least one of a dual hop channel configuration and a single hop channel configuration over which the call between the first and second satellite radiotelephones is conducted during the active state of the call, wherein the dual hop channel configuration is assigned when the information includes the request to suspend single hop call configuration by the satellite radiotelephone system and the single hop channel configuration is assigned when the information does not include the request to suspend single hop call configuration by the satellite radiotelephone system; and

transmitting the assigned channels in the at least one of the dual hop channel configuration and the single hop channel configuration to the first and second satellite radiotelephone user terminals.

10. The method of claim 9, wherein the step of receiving comprises the step of receiving information from the first satellite user terminal, wherein the information includes at least one of a suspension code and a suspension message which requests the suspension of single hop call configuration for the active state of the call.

11. The method of claim 10, wherein the suspension code comprises at least one of a suffix and a prefix associated with a telephone number the identifies the second satellite user terminal in the satellite radiotelephone system.

12. A method of conducting a call from a first user terminal to a second user terminal in a communications system, the method comprising the steps of:

transmitting information from the first user terminal to the communications system, wherein the information includes a request to suspend single hop call configuration by the communications system and to conduct an active state of the call from the first user terminal to the second user terminal via a ground segment in the communications system; and

conducting the active state of the call from the first user terminal to the second user terminal via the ground segment based on the request.

13. The method of claim 12, wherein the first and second user terminals are respective first and second satellite radiotelephones served by a satellite in the communications system.

14. The method of claim 12, wherein the step of transmitting comprises the step of transmitting information from the first user terminal to the communications system, wherein the information includes at least one of a suspension code and a suspension message which requests the suspension of single hop call configuration for the active state of the call.

15. The method of claim 14, wherein the suspension code comprises at least one of a suffix and a prefix associated with a telephone number the identifies the second satellite user terminal in the satellite radiotelephone system.

16. A satellite user terminal that communicates with a satellite radiotelephone system via a satellite in the satellite radiotelephone system, the satellite user terminal comprising:

a transceiver that transmits and receives signals to and from the satellite radiotelephone system;

a keypad configured to provide input to the satellite user terminal;

a processor, responsive to the transceiver and the keypad, that configures a signal for transmission to the satellite radiotelephone system in response to initiating a call to a user terminal, wherein the signal includes a request to conduct an active state of the call from the satellite user terminal to the user terminal via a ground segment in the satellite radiotelephone system.

17. A satellite user terminal that communicates with a satellite radiotelephone system via a satellite in the satellite radiotelephone system, the satellite user terminal comprising:

a transceiver that transmits and receives signals to and from the satellite radiotelephone system;

a keypad configured to provide input to the satellite user terminal;

a processor, responsive to the transceiver and the keypad, that configures a signal for transmission to the satellite radiotelephone system in response to initiating a call to a user terminal, wherein the signal includes a request to conduct an active state of the call from the satellite user terminal to the user terminal via a ground segment in the satellite radiotelephone system, wherein the request comprises at least one of a suspension code and a suspension message which requests the suspension of single hop call configuration for the active state of the call in the satellite radiotelephone system.

18. The satellite user terminal of claim 17, wherein the suspension code comprises at least one of a suffix and a prefix associated with a telephone number transmitted by the satellite user terminal to identify the user terminal.

19. A satellite radiotelephone system comprising:

a satellite that communicates with a plurality of satellite user terminals in the satellite radiotelephone system;

a satellite user terminal that transmits a signal to the satellite radiotelephone system via the satellite, wherein the signal includes a request to the satellite radiotelephone system to conduct an active state of a call from the first satellite user terminal to a destination as a dual hop call;

a switching center, responsive to the satellite and the satellite user terminal, wherein the switching center conducts the call from the satellite user terminal to the destination in the active state based on the request.

20. The satellite radiotelephone system of claim 19, wherein the switching center determines whether the destination is a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite and conducts the active state of the call between the first satellite user terminal and the destination in response to the request, if the destination is a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite.

21. The satellite radiotelephone system of claim 20, wherein the switching center conducts the active state of the call between the satellite user terminal and the destination, wherein the destination does not communicate with the satellite directly if the destination is not a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite.

22. The satellite radiotelephone system of claim 19, wherein the satellite user terminal transmits information that includes at least one of a suspension code and a suspension message which requests the suspension of single hop call configuration for the active state of the call.

23. The satellite radiotelephone system of claim 22, wherein the suspension code comprises at least one of a suffix and a prefix associated with a telephone number the identifies the second satellite user terminal in the satellite radiotelephone system.

24. A switching center that communicates with a plurality of satellite user terminals in a satellite radiotelephone system via a satellite in the satellite radiotelephone system, the switching center comprising:

a transceiver that transmits and receives signals to and from the plurality of satellite user terminals; and

a processor, responsive to the transceiver, wherein the processor receives a request from a first satellite user terminal to conduct an active state of a call initiated by the first satellite user terminal to a destination, and that conducts the call from the first satellite user terminal to the destination in the active state based on the request.

25. The switching center of claim 24, wherein the processor determines whether the destination is a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite and conducts the active state of the call between the first satellite user terminal and the destination in response to the request, if the destination is a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite.

26. The switching center of claim 24, wherein the processor conducts the active state of the call between the satellite user terminal and the destination, wherein the destination does not communicate with the satellite directly if the destination is not a second satellite user terminal that communicates with the satellite radiotelephone system via the satellite.

27. A switching center that communicates with a plurality of satellite user terminals in a satellite radiotelephone system via a satellite in the satellite radiotelephone system, the switching center comprising:

a transceiver that transmits and receives signals to and from the plurality of satellite user terminals; and

a processor, responsive to the transceiver, wherein the processor receives a request from a first satellite user terminal to conduct an active state of a call initiated by the first satellite user terminal to a destination, and that conducts the call from the first satellite user terminal to the destination in the active state based on the request, wherein the signals received from the first satellite user terminal include at least one of a suspension code and a suspension message which requests the suspension of single hop call configuration for the active state of the call.

28. The switching center of claim 27, wherein the suspension code comprises at least one of a suffix or prefix associated with a telephone number the identifies the second satellite user terminal in the satellite radiotelephone system.