Switching communication modes in a network

• US 6,894,992 B1
• Filed: 07/20/1999
• Issued: 05/17/2005
• Est. Priority Date: 07/28/1998
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tocze, Lionel, Caillerie, Alain, Morvan, Isabelle
• Primary Examiner(s): Pezzlo, John
• Application Number:
  US09/357,813
• Time in Patent Office: 2,128 Days
• Field of Search: 370/337, 370/278, 370/329, 370/437, 370/316, 370/280, 370/338, 370/442, 370/226, 455/423, 455/7, 455/434, 455/435, 455/450, 455/414, 455/417, 455/463, 455/502, 455/426, 455/442, 455/553, 455/432, 455/9, 455/11.1, 455/561, 455/427, 379/60, 379/88
• US Class Current: 370/329
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The communication method of the invention applies to communication stations adapted to communicate with each other when at least one of said communication stations supplies a control signal, said station then functioning in “base station” mode and the stations not supplying a control signal then functioning in “mobile station” mode.

The method of the invention includes, for at least one communication between two communication stations functioning in mobile station mode, in connection with a first base station:

• • an operation of determining a second station, during which a communication station functioning in mobile station mode able to function in base station mode is determined,
  • a switching request operation during which a message representing a request to switch into base station mode is sent to the second station determined during the determination operation.

Claims

1. A method of communicating between communication stations adapted to communicate with each other when at least one of said communication stations supplies a control signal, said station then functioning in base station mode, and the stations not supplying the control signal then functioning in mobile station mode, the method comprising the steps of:

performing a request operation in which a first communication station functioning in mobile station mode transmits to a second communication station functioning in base station mode a message representing a request to retrieve the function of base station; and

if the second communication station accepts the request, switching the functioning of the first communication station from mobile station mode to base station mode.

2. The method according to claim 1, further comprising a step of determining whether the first communication station has better capabilities of being a base station than the second communication station, this step being executed prior to the step of performing the request operation.

3. The method according to claim 2, wherein the capabilities of being a base station represent the number of supported variants of a communication standard to which the communication stations are compliant.

4. The method according to claim 2, wherein the second communication station accepts the request of the first communication station if the capabilities of the first communication station for being a base station are better than those of the second communication station and if the second communication station does have active connections.

5. The method according any one of claims 1 to 3, further comprising a step of switching the functioning mode of the second communication station from base station to mobile station mode.

13. An information storage means, which can be read by a computer or a microprocessor, storing instructions of a computer program, said computer program implementing a communication method according to claim 1.

14. An information storage means, which is partially or totally removable and can be read by a computer or a microprocessor, storing instructions of a computer program implementing a communication method according to claim 1.

6. A method of communicating between communication stations adapted to communicate with each other when at least one of said communication stations supplies a control signal, said station then functioning in base station mode, and the stations not supplying the control signal then functioning in mobile station mode, the method comprising the steps of:

determining whether the capabilities of a first communication station functioning in base station mode are sufficient to support a communication between two communication stations functioning in mobile station mode; and

if the capabilities of the first communication station are not sufficient, performing a request operation in which the first communication station transmits to a second communication station functioning in mobile station mode a message representing a request to switch its function to base station mode and to temporarily handle the communication between the two communication stations.

7. A device for communicating between communication stations adapted to communicate with each other when at least one of said communication stations supplies a control signal, said station then functioning in base station mode and the stations not supplying the control signal then functioning in mobile station mode, the device comprising:

means for performing a request operation in which a first communication station functioning in mobile station mode transmits to a second communication station functioning in base station mode a message representing a request to retrieve the function of base station; and

means for switching the functioning of the first communication station from mobile station mode to base station mode if the second communication station accepts the request.

8. The device according to claim 7, further comprising means for determining whether the first communication station has better capabilities of being a base station than the second communication station.

9. The device according to claim 8, wherein the capabilities of being a base station represent the number of supported variants of a communication standard to which the communication stations are compliant.

10. The device according to claim 8, wherein the second communication station accepts the request of the first communication station if the capabilities of the first communication station of being a base station are better than those of the second communication station and if the second communication station does have active connections.

11. The device according to any one of claims 7 to 9, further comprising means for switching the functioning mode of the second communication station from base station to mobile station mode.

12. A device for communicating between communication stations adapted to communicate with each other when at least one of said communication stations supplies a control signal, said station then functioning in base station mode, and the stations not supplying the control signal then functioning in mobile station mode, the device comprising:

means for determining whether the capabilities of a first communication station functioning in base station mode are sufficient to support a communication between two communication stations functioning in mobile station mode; and

means for performing a request operation in which the first communication station transmits to a second communication station functioning in mobile station mode a message representing a request to switch its function to base station mode and to temporarily handle the communication between the two communication stations if the capabilities of the first communication station are not sufficient.