METHOD AND APPARATUS TO PREVENT RAN (RADIO ACCESS NETWORK) OVERLOAD FOR LEGACY NETWORKS IN A WIRELESS COMMUNICATION SYSTEM

• US 20120307632A1
• Filed: 05/31/2012
• Published: 12/06/2012
• Est. Priority Date: 05/31/2011
• Status: Active Grant

• Current Assignee: Innovative Sonic Limited
• Original Assignee: Innovative Sonic Limited
• Inventors: Guo, Yu-Hsuan, Ou, Meng-Hui
• Granted Patent: US 8,830,828 B2
• Time in Patent Office: Days
• US Class Current: 370/230
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04W 28/0205 at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/0215 based on user or device properties, e.g. MTC-capable devices services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 48/06 based on traffic conditions

Abstract

A method and apparatus are disclosed to prevent RAN (Radio Access Network) overload for legacy networks in a wireless communication system. In one embodiment, the method comprise initiating a RRC (Radio Resource Control) connection establishment procedure to access a cell. The method further comprises performing an access barring check. The method also comprises extending a barring time autonomously.

Claims

1. A method to prevent RAN (Radio Access Network) overload, comprising:

initiating a RRC (Radio Resource Control) connection establishment procedure to access a cell;

performing an access barring check; and

extending a barring time or a barring factor autonomously.

2. The method of claim 1, further comprising setting the establishment cause to delay tolerant in the RRC connection establishment procedure.

3. The method of claim 1, wherein the UE is a MTC (Machine Type Communication) UE.

4. The method of claim 1, wherein the UE is configured with EAB (Extended Access Barring).

5. The method of claim 1, wherein the UE extends the barring time by enlarging TBarring.

6. The method of claim 1, wherein the LT extends the barring factor by enlarging ac-BarringFactor.

7. The method of claim 1, wherein the cell does not support functionality to handle RAN overload, and the support of the functionality by a cell is broadcasted by some indication about the RAN overload handling functionality.

8. The method of claim 7, wherein the functionality to handle RAN overload is EAB (Extended Access Barring).

9. The method of claim 7, wherein a UE configured with EAB prioritizes the cell broadcasting the indication during cell selection/re-selection.

10. A method to prevent RAN (Radio Access Network) overload, comprising:

initiating a RRC (Radio Resource Control) connection establishment procedure to access a cell;

performing an access barring check during the RRC connection establishment procedure; and

setting a lower bound of a range to be a value larger than zero when generating a random number;

wherein the random number is used to compare with a received access class barring factor.

11. The method of claim 10, further comprising:

broadcasting system information to indicate whether a neighbor cell supports RAN overload control.

12. The method of claim 11, wherein the system information includes an indication whether the neighbor cell supports or does not support EAB (Extended Access Barring).

13. The method of claim 11, wherein the system information includes a cell list used to perform cell selection.

14. The method of claim 10, further comprising:

reducing the received access class barring factor autonomously.

15. The method of claim 10, further comprising:

prioritizing a cell, during cell selection, depending on whether the cell supports or does not support EAB (Extended Access Barring).

16. The method of claim 10, wherein the random number is between zero and one.

17. The method of claim 10, wherein the received access barring factor is ac-BarringFactor.

18. The method of claim 10, wherein access to the cell would not be barred if the random number is lower than the received access class barring factor.

19. The method of claim 10, wherein access to the cell would be barred if the random number is greater than or equal to the received access class barring factor.

20. A method to prevent RAN (Radio Access Network) overload, comprising:

initiating a RRC (Radio Resource Control) connection re-establishment procedure;

selecting a cell during the RRC connection establishment procedure to broadcast EAB (Extended Access Barring) information;

broadcasting, from the selected cell, the EAB (Extended Access Barring) information that includes specific barring information; and

applying the specific barring information for the RRC connection re-establishment procedure.

21. The method of claim 20, further comprising:

de-prioritizing the cell that broadcasts the EAB (Extended Access Barring) information that includes specific barring information in the cell selection process.

22. The method of claim 20, further comprising:

considering the cell that broadcasts the EAB (Extended Access Barring) information as not suitable in the cell selection process.

23. The method of claim 20, wherein a UE initiates the RRC (Radio Resource Control) connection re-establishment procedure.

24. The method of claim 23, wherein the UE enters idle mode when the selected cell broadcasts EAB (Extended Access Barring) information that includes specific barring information.