BASE STATION AND SERVICE FLOW ESTABLISHMENT METHOD

• US 20100054208A1
• Filed: 05/27/2009
• Published: 03/04/2010
• Est. Priority Date: 08/29/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kojima, Yuji
• Granted Patent: US 8,638,748 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections

Abstract

A base station includes a determining unit that determines whether a competition occurs between an identifier of a first service flow established with respect to a mobile station and an identifier of a second service flow which is requested to newly establish with respect to the mobile station; a changing unit that changes the identifier of the first service flow or the identifier of the second service flow, when the determining unit determines that the competition of the identifiers occurs; and an establishing unit that establishes the second service flow by using the identifier of the second service flow with the competition being eliminated against the first service flow through the change by the changing unit.

Claims

1. A base station comprising:

a determining unit that determines whether a competition occurs between an identifier of a first service flow established with respect to a mobile station and an identifier of a second service flow which is requested to newly establish with respect to the mobile station;

a changing unit that changes the identifier of the first service flow or the identifier of the second service flow, when the determining unit determines that the competition of the identifiers occurs; and

an establishing unit that establishes the second service flow by using the identifier of the second service flow with the competition being eliminated against the first service flow through the change by the changing unit.

2. The base station according to claim 1, wherein the changing unit comprises:

an adding unit that adds the same service flow as the first service flow to which a different identifier from that of the first service flow is assigned, when the determining unit determines that the competition of identifiers occurs; and

a deleting unit that deletes the first service flow after a service flow is added by the adding unit.

3. The base station according to claim 2, wherein the adding unit adds a service flow assigned with a different identifier from identifiers of all the established service flows including the first service flow.

4. The base station according to claim 1, wherein when the determining unit determines that the competition of identifiers occurs, the changing unit converts the identifier of the second service flow into a different identifier from identifiers of all established service flows including the first service flow.

5. The base station according to claim 4, further comprising:

a detecting unit that detects that the mobile station hands over to other base station;

a deleting unit that deletes the first service flow and deletes the second service flow whose identifier has been converted by the changing unit, when the handover of the mobile station is detected by the detecting unit; and

an adding unit that adds the same service flow as the second service flow assigned with an unconverted identifier by the changing unit, after the first service flow and the second service flow are deleted by the deleting unit.

6. The base station according to claim 4, further comprising:

a detecting unit that detects that the mobile station hands over to other base station;

a determining unit that determines whether each of the established service flows is a service flow whose identifier has been converted by the changing unit, when the handover of the mobile station is detected by the detecting unit; and

an instructing unit that instructs the other base station to reestablish the service flow whose identifier is determined to have been converted by the determining unit.

7. A base station comprising:

an establishing unit that establishes a service flow to be used for communicating with a mobile station; and

a preventing unit that prevents establishment of a service flow whose identifier is the same as of the service flow established by the establishing unit from being requested by a different higher device from the mobile station.

8. The base station according to claim 7, wherein the preventing unit establishes a dummy path whose identifier is the same as of the service flow established by the establishing unit and which is not used for data exchange with respect to the higher device.

9. The base station according to claim 7, wherein the preventing unit transmits a reservation message indicating that the identifier of the service flow established by the establishing unit is being used to the higher device.

10. A computer readable storage medium containing instructions that, when executed by a computer, causes the computer to perform:

determining whether a competition occurs between an identifier of a first service flow established with respect to a mobile station and an identifier of a second service flow which is requested to newly establish with respect to the mobile station;

changing the identifier of the first service flow or the identifier of the second service flow, when it is determined in the determining that the competition of the identifiers occurs; and

establishing the second service flow by using the identifier of the second service flow with the competition being eliminated against the first service flow through the change in the changing.

11. A service flow establishment method comprising:

determining whether a competition occurs between an identifier of a first service flow established with respect to a mobile station and an identifier of a second service flow which is requested to newly establish with respect to the mobile station;

changing the identifier of the first service flow or the identifier of the second service flow, when it is determined in the determining that the competition of the identifiers occurs; and

establishing the second service flow by using the identifier of the second service flow with the competition being eliminated against the first service flow through the change in the changing.