Method and apparatus for spanning operation of a cellular telephone

• US 6,643,512 B1
• Filed: 09/14/1999
• Issued: 11/04/2003
• Est. Priority Date: 09/14/1999
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Ramaswamy, Satyanarayanan
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): Chow, C.
• Application Number:
  US09/395,791
• Time in Patent Office: 1,512 Days
• Field of Search: 455/435, 455/450, 455/443, 455/434, 455/502, 455/422, 455/552, 455/462, 455/515, 455/555, 455/403, 455/411, 455/461, 370/331, 370/330, 370/332, 370/333, 370/336, 370/337, 370/316, 370/466, 370/522, 709/236
• US Class Current: 455/435.1
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells

Abstract

The apparatus and method of the present invention provides a system for spanning operation of a mobile station (110) between a public cellular system (100) for packet data service and a private autonomous cellular system (102) for circuit services when both services are available. In the disclosed system, the mobile station (110) remains on the public system (100) until a circuit call needs to be set up. If the mobile station (110) receives a call on the autonomous system (102), it is notified by the public system (100) via a tunneling message. If the mobile station (110) wishes to originate a call, it switches to the control channels of the autonomous system (102). If the signal strength of the autonomous system (102) falls below a predefined threshold, the mobile station (110) exits the disclosed dual mode, thereby receiving both packet and circuit services from the public system 100.

Claims

1. A method for spanning operation of a cellular telephone simultaneously between a public cellular system for packet services and an autonomous cellular system for circuit services in communication with the public cellular system, wherein the public cellular system covers a first geographic region and the autonomous cellular system covers a second geographic region, the first geographic region intersecting the second geographic region, the method comprising the steps of:

receiving a pointer to a public control channel associated with the public cellular system via an autonomous broadcast control channel associated with the autonomous cellular system in communication with the public cellular system;

transmitting an attach message to the public cellular system via the public control channel, the attach message being indicative of a request for packet services;

receiving a success message from the public cellular system via the public control channel, the success message being indicative of a positive acknowledgment to the attach message;

transmitting a first registration message to the autonomous cellular system via the public control channel using a first tunneling protocol, the first registration message being indicative of a request to initiate circuit services;

receiving a circuit page message from the autonomous cellular system via the public control channel using a second tunneling protocol, the circuit page message being indicative of a request to accept a pending cellular telephone voice call; and

transmitting a page response message to the autonomous cellular system via the autonomous broadcast control channel, the page response message being indicative of a positive acknowledgment to the circuit page message.

2. A method as defined in claim 1, further comprising the step of transmitting an origination message to the autonomous cellular system via the autonomous broadcast control channel, the origination message being indicative of a request to place a cellular telephone voice call.

3. A method as defined in claim 1, further comprising the step of periodically determining a first signal strength associated with the autonomous cellular system.

4. A method as defined in claim 3, wherein the step of periodically determining a first signal strength associated with the autonomous cellular system is performed substantially concurrent with a step of determining a second signal strength associated with the public cellular system.

5. A method as defined in claim 1, further comprising the steps of:

transmitting a de-registration message to the autonomous cellular system via the public control channel using the first tunneling protocol, the de-registration message being indicative of a request to terminate circuit services; and

transmitting a second registration message to the public cellular system via the public control channel, the second registration message being indicative of a request to initiate circuit services.

6. A method as defined in claim 1, wherein the first geographic region is larger than the second geographic region.

7. A method as defined in claim 1, wherein the first geographic region completely encompasses the second geographic region.

8. A method as defined in claim 1, wherein the public cellular system comprises a GPRS-136 general packet radio service system.

9. A method as defined in claim 1, wherein the public control channel comprises a GPRS-136 packet control channel.

10. A method as defined in claim 1, wherein the first tunneling protocol and the second tunneling protocol comprises a TIA/EIA-136-336 TOM protocol.

11. A wireless communication device capable of spanning operation simultaneously between a public cellular system for packet services and an autonomous cellular system for circuit services in communication with the public cellular system, wherein the public cellular system covers a first geographic region and the autonomous cellular system covers a second geographic region, the first geographic region intersecting the second geographic region, comprising:

a receiver for receiving (i) a pointer message via an autonomous broadcast control channel associated with the autonomous cellular system in communication with the public cellular system, the pointer message including a pointer to a public control channel associated with the public cellular system, (ii) a success message from the public cellular system via the public control channel, the success message being indicative of a positive acknowledgment to the attach message, and (iii) a circuit page message from the autonomous cellular system via the public control channel using a second tunneling protocol, the circuit page message being indicative of a request to accept a pending cellular telephone voice call;

a transmitter for transmitting (i) an attach message to the public cellular system via the public control channel, the attach message being indicative of a request for packet services, (ii) a first registration message to the autonomous cellular system via the public control channel using a first tunneling protocol, the first registration message being indicative of a request to initiate circuit services, and (iii) a page response message to the autonomous cellular system via the autonomous broadcast control channel, the page response message being indicative of a positive acknowledgment to the circuit page message; and

a controller operatively coupled to the transmitter and the receiver, the controller being adapted to (i) decode the pointer message, (ii) decode the success message, (iii) decode the circuit page message, (iv) generate the attach message, (v) generate the first registration message, and (vi) generate the page response message.

12. A wireless communication device as defined in claim 11, wherein the controller is further adapted to cause the transmitter to transmit an origination message to the autonomous cellular system via the autonomous broadcast control channel, the origination message being indicative of a request to place a cellular telephone voice call.

13. A wireless communication device as defined in claim 11, wherein the controller is further adapted to cause the transmitter to transmit a de-registration message to the autonomous cellular system via the public control channel using the first tunneling protocol, the de-registration message being indicative of a request to terminate circuit services;

and the controller is further adapted to cause the transmitter to transmit a second registration message to the public cellular system via the public control channel, the second registration message being indicative of a request to initiate circuit services.

14. A wireless communication device as defined in claim 11, wherein the wireless communication device is adapted for operation within a GPRS-136 general packet radio service system.

15. A wireless communication device as defined in claim 11, wherein the public control channel comprises a GPRS-136 packet control channel.

16. A wireless communication device as defined in claim 11, wherein the first tunneling protocol and the second tunneling protocol comprises a TIA/EIA-136-336 TOM protocol.

17. A method for spanning operation of a cellular telephone simultaneously between a public cellular system for packet services and an autonomous cellular system for circuit services in communication with the public cellular system, wherein the public cellular system covers a first geographic region and the autonomous cellular system covers a second geographic region, the first geographic region intersecting the second geographic region, the method comprising the steps of:

receiving a pointer to a public control channel associated with the public cellular system via an autonomous broadcast control channel associated with the autonomous cellular system in communication with the public cellular system;

transmitting an attach message to the public cellular system via the public control channel, the attach message being indicative of a request for packet services;

receiving a success message from the public cellular system via the public control channel, the success message being indicative of a positive acknowledgment to the attach message; and

transmitting a first registration message to the autonomous cellular system via the public control channel using a first tunneling protocol, the first registration message being indicative of any of a request for circuit services and a communication path comprises the public cellular system.

18. A method as defined in claim 17, further comprising the step of receiving a first registration accept message indicative of circuit services being initiated.

19. A method as defined in claim 17, further comprising:

receiving a circuit page message from the autonomous cellular system via the public control channel using a second tunneling protocol, the circuit page message being indicative of a request to accept a pending cellular telephone voice call; and

transmitting a page response message to the autonomous cellular system via the autonomous broadcast control channel, the page response message being indicative of a positive acknowledgment to the circuit page message.

20. A method as defined in claim 17, further comprising the step of transmitting an origination message to the autonomous cellular system via the autonomous broadcast control channel, the origination message being indicative of a request to place a cellular telephone voice call.