CELL RESELECTION METHOD AND USER EQUIPMENT THEREFOR

• US 20160007260A1
• Filed: 03/04/2014
• Published: 01/07/2016
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: JUNG, Sunghoon, ABRAHAM, Aby Kanneath, JAYACHANDRAN, Harikrishnan, MANDEPUDI, Naveen Kumar
• Granted Patent: US 9,820,206 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/008375 based on historical data
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

Provided according to one embodiment of the present specification is a cell reselection method for reducing ping-pong phenomena. The cell reselection method may comprise the steps of: receiving information on ping-pong detection standards; determining the occurrence of ping-pong caused by the repetition of cell reselection between a first cell and a second cell on the basis of the information on ping-pong detection standards; and adjusting the priority of either cell according to the result of the determination.

Claims

1. A cell reselection method, comprising

receiving information about a ping-gong detection criterion;

determining whether a ping-pong phenomenon is occurred due to repetition of cell reselection between a first and a second cell based on the information about a ping-pong detection criterion; and

adjusting priority of one of the cells according to the determination result.

2. The method of claim 1, further comprising receiving information about priority between a first and a second cell.

3. The method of claim 1, wherein the information about a ping-pong detection criterion includes information about a ping-pong related timer and a ping-pong related counter.

4. The method of claim 3, wherein the determining whether a ping-pong phenomenon is occurred comprises

activating the ping-pong related timer;

and

determining according to the information about priority whether the number of repetitions of cell reselection between a first and a second cell reaches the ping-pong related counter before the ping-pong related timer expires.

5. The method of claim 2, wherein the information about priority includes information about inter-RAT (Radio Access Technology) priority and inter-frequency priority.

6. The method of claim 3, wherein the information about a ping-pong related timer and a ping-pong related counter is received through Radio Resource Control (RRC) signaling or system information.

7. The method of claim 2, wherein the adjusting priority comprises applying a compensation factor to the priority of the second cell corresponding to a neighboring cell in case it is found from the received information about priority that priority of the second cell corresponding to the neighboring cell is higher than that of the first cell corresponding to a serving cell.

8. The method of claim 7, wherein the compensation factor takes on a value identical to a difference between priority of the first cell and priority of the second cell.

9. The method of claim 2, wherein the adjusting priority decreases priority of the second cell corresponding to a neighboring cell by one step in case it is found from the received information about priority that priority of the second cell corresponding to the neighboring cell is higher than that of the first cell corresponding to a serving cell.

10. The method of claim 2, wherein the adjusting priority decreases priority of the second cell corresponding to a neighboring cell by one step in case it is found from the received information about priority that priority of the first cell corresponding to a serving cell is the same as that of the second cell corresponding to the neighboring cell.

19. The UE of claim 2, wherein, to adjust the priority, the processor is configured to decrease priority of the second cell corresponding to a neighboring cell by one step in case it is found from the received information about priority that priority of the first cell corresponding to a serving cell is the same as that of the second cell corresponding to the neighboring cell.

11. A user equipment carrying out cell reselection, comprising:

an Radio Frequency (RF) unit configured to receive information about a ping-pong detection criterion; and

a processor configured to determine whether a ping-pong phenomenon is occurred due to repetition of cell reselection between a first and a second cell based on the information about a ping-pong detection criterion and to adjust priority of one of the cells according to the determination result.

12. The UE of claim 11, wherein the RF unit is configured to further receive information about priority between a first and a second cell.

13. The UE of claim 11, wherein the information about a ping-pong detection criterion includes information about a ping-pong related timer and a ping-pang related counter.

14. The UE of claim 12, wherein the information about priority includes information about inter-RAT (Radio Access Technology) priority and inter-frequency priority.

15. The UE of claim 13, wherein the information about a ping-pong related timer and a ping-pong related counter is received through Radio Resource Control (RRC) signaling or system information.

16. The UE of claim 12, wherein, to adjust the priority, the processor is configured to apply a compensation factor to the priority of the second cell corresponding to a neighboring cell in case it is found from the received information about priority that priority of the second cell corresponding to the neighboring cell is higher than that of the first cell corresponding to a serving cell.

17. The UE of claim 16, wherein the compensation factor takes on a value identical to a difference between priority of the first cell and priority of the second cell.

18. The UE of claim 12, wherein, to adjust the priority, the processor is configured to decrease priority of the second cell corresponding to a neighboring cell by one step in case it is found from the received information about priority that priority of the second cell corresponding to the neighboring cell is higher than that of the first cell corresponding to a serving cell.