Interrupting use of frequency layer convergence scheme

• US 20060062237A1
• Filed: 08/05/2005
• Published: 03/23/2006
• Est. Priority Date: 08/05/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Myeong-Cheol
• Granted Patent: US 7,512,145 B2
• Time in Patent Office: Days
• US Class Current: 370/432
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

The present invention is directed to interrupting use of a frequency layer convergence scheme that favors selection of a cell on a preferred frequency of a joined point-to-multipoint service. Specifically, a mobile terminal that has joined a point-to-multipoint service having a preferred frequency uses a frequency layer convergence scheme for selecting a cell. The frequency layer convergence scheme favors the selection of a cell on the preferred frequency layer. However, use of the frequency layer convergence scheme is interrupted upon an occurrence of a trigger.

Claims

1. A method for selecting a cell by a mobile terminal in a wireless communication system, the method comprising:

joining a point-to-multipoint service having a preferred frequency;

using a frequency layer convergence scheme for selecting the cell, wherein the frequency layer convergence scheme favors the selection of the cell on the preferred frequency; and

interrupting the use of the frequency layer convergence scheme upon an occurrence of a trigger.

2. The method of claim 1, wherein the point-to-multipoint service is an MBMS service.

3. The method of claim 1, wherein the trigger for interrupting the use of the frequency layer convergence scheme is based on a procedure initiated with a network that fails while using the frequency layer convergence scheme.

4. The method of claim 3, wherein the procedure with the network comprises establishing a connection with a core network (CN) domain.

5. The method of claim 4, wherein the CN domain is at least one of:

a packet switched (PS) domain; and

a circuit switched (CS) domain.

6. The method of claim 3, wherein the procedure with the network comprises at least one of:

a PRACH access procedure;

a radio resource control (RRC) procedure for transmitting information to the network;

a medium access control (MAC) procedure for transmitting data to the network; and

a procedure for selecting a cell on a given frequency according to an order received from the network.

7. The method of claim 1, wherein the trigger for interrupting the use of the frequency layer convergence scheme comprises receiving a message initiating a reconfiguration procedure.

8. The method of claim 1, wherein the trigger for interrupting the use of the frequency layer convergence scheme comprises initiating a procedure for selecting a cell on a given frequency according to an order received from a network.

9. The method of claim 1, wherein interrupting the use of the frequency layer convergence scheme continues until a timer expires.

10. The method of claim 9, wherein the timer is started when the frequency layer convergence scheme is first interrupted.

11. The method of claim 9, wherein the timer is started when a procedure initiated with a network comprising a PRACH access procedure fails.

12. The method of claim 9, wherein the timer is started when a procedure initiated with a network comprising a medium access control (MAC) procedure for transmitting data to the network fails.

13. The method of claim 9, wherein the timer is started when a procedure initiated with a network comprising a procedure for selecting a cell on a given frequency according to an order received from the network fails.

14. The method of claim 9, wherein a value for duration of the timer is received in a system information message from a network.

15. The method of claim 9, wherein a value for duration of the timer is a fixed value.

16. The method of claim 1, further comprising selecting a cell on a frequency other than the preferred frequency.

17. The method of claim 1, further comprising:

initiating a procedure with a network; and

continuing to interrupt the use of the frequency layer convergence scheme until the procedure initiated with the network ends.

18. The method of claim 1, further comprising:

initiating a procedure with a network; and

releasing a connection with a core network (CN) domain when the procedure initiated with the network ends.

19. A mobile terminal for selecting a cell in a wireless communication system, the mobile terminal comprising:

means for joining a point-to-multipoint service having a preferred frequency;

means for using a frequency layer convergence scheme for selecting the cell, wherein the frequency layer convergence scheme favors the selection of the cell on the preferred frequency; and

means for interrupting the use of the frequency layer convergence scheme upon an occurrence of a trigger.

20. The mobile terminal of claim 19, wherein the point-to-multipoint service is an MBMS service.

21. The mobile terminal of claim 19, wherein the trigger for interrupting the use of the frequency layer convergence scheme is based on a procedure initiated with a network that fails while using the frequency layer convergence scheme.

22. The mobile terminal of claim 21, wherein the procedure with the network comprises establishing a connection with a core network (CN) domain.

23. The mobile terminal of claim 22, wherein the CN domain is at least one of:

a packet switched (PS) domain; and

a circuit switched (CS) domain.

24. The mobile terminal of claim 21, wherein the procedure with the network comprises at least one of:

a PRACH access procedure;

a radio resource control (RRC) procedure for transmitting information to the network;

a medium access control (MAC) procedure for transmitting data to the network; and

a procedure for selecting a cell on a given frequency according to an order received from the network.

25. The mobile terminal of claim 19, wherein the trigger for interrupting the use of the frequency layer convergence scheme comprises receiving a message initiating a reconfiguration procedure.

26. The mobile terminal of claim 19, wherein the trigger for interrupting the use of the frequency layer convergence scheme comprises initiating a procedure for selecting a cell on a given frequency according to an order received from a network.

27. The mobile terminal of claim 19, wherein interrupting the use of the frequency layer convergence scheme continues until a timer expires.

28. The mobile terminal of claim 27, wherein the timer is started when the frequency layer convergence scheme is first interrupted.

29. The mobile terminal of claim 27, wherein the timer is started when a procedure initiated with a network comprising a PRACH access procedure fails.

30. The mobile terminal of claim 27, wherein the timer is started when a procedure initiated with a network comprising a medium access control (MAC) procedure for transmitting data to the network fails.

31. The mobile terminal of claim 27, wherein the timer is started when a procedure initiated with a network comprising a procedure for selecting a cell on a given frequency according to an order received from the network fails.

32. The mobile terminal of claim 27, wherein a value for duration of the timer is received in a system information message from a network.

33. The mobile terminal of claim 27, wherein a value for duration of the timer is a fixed value.

34. The mobile terminal of claim 19, further comprising means for selecting a cell on a frequency other than the preferred frequency.

35. The mobile terminal of claim 19, further comprising:

means for initiating a procedure with a network; and

means for continuing to interrupt the use of the frequency layer convergence scheme until the procedure initiated with the network ends.

36. The mobile terminal of claim 19, further comprising:

means for initiating a procedure with a network; and

means for releasing a connection with a core network (CN) domain when the procedure initiated with the network ends.