Effective system information reception method

• US 8,190,144 B2
• Filed: 06/20/2008
• Issued: 05/29/2012
• Est. Priority Date: 06/20/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Sung-Duck, Lee, Young-Dae, Park, Sung-Jun, Yi, Seung-June
• Primary Examiner(s): Thier, Michael
• Application Number:
  US12/143,607
• Publication Number:
  US 20080318566A1
• Time in Patent Office: 1,439 Days
• Field of Search: 455/422.1, 455/450, 455/464, 455/509, 370/310, 370/322, 370/329, 370/348
• US Class Current: 455/422.1
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

Disclosed is the method for informing, by a wireless communication system, to a terminal about information required for reception when the terminal is connected to the wireless communication system, in which a base station updates system information according to a preset period, and the terminal efficiently receives or checks any update of the system information based on the period.

Claims

1. A method of receiving updated system information in a wireless communication system, the method comprising:

receiving system information comprising a value;

receiving, by a terminal via a downlink shared control channel, a notification for changing of the system information, wherein the notification is one of a plurality of notifications that are each received during one of a plurality of modification periods, wherein each period of the plurality of modification periods has boundaries which are defined based on a System Frame Number (SFN) and the value of the system information;

determining, for each of the plurality of modification periods, if there is a change in the system information based on the received notification;

if there is a change in the system information, then receiving, by the terminal, an updated system information during a modification period of the plurality of modification periods, wherein the updated system information is received via a downlink shared data channel;

wherein changes of the system information only occur at respective modification periods of the plurality of modification periods.

2. The method of claim 1, wherein each period of the plurality of modification periods is a Broadcast Control Channel (BCCH) modification period.

3. The method of claim 1, wherein the notification is received through a current Broadcast Control Channel (BCCH) modification period, and the updated system information is received within a next BCCH modification period.

4. The method of claim 1, wherein the notification is received through a current Broadcast Control Channel (BCCH) modification period and the updated system information is received within the current BCCH modification period.

5. The method of claim 1, wherein when there is no change in the system information, current system information is valid until a next modification period, of the plurality of modification periods.

6. The method of claim 1, wherein the modification period indicates a minimum period in which the system information can be modified.

7. The method of claim 1, wherein the modification period indicates a minimum period in which a network can change the system information.

8. The method of claim 1, wherein the modification period indicates a minimum time in which a network should wait for a next updated system information after changing the system information.

9. The method of claim 1, wherein the modification period indicates a maximum period in which the terminal determines if there is a change in the system information.

10. The method of claim 1, wherein each period of the plurality of modification periods defines a minimum period during which the system information is not changed.

11. The method of claim 1, wherein the notification comprises a radio network temporary identifier (RNTI).

12. The method of claim 1, wherein the value of the system information permits definition of at least one of a starting point, a period of time duration, or length of time duration, of each modification period of the plurality of modification periods.

13. The method of claim 1, wherein a number of notifications received during the modification period is not greater than 1.

14. A method of transmitting updated system information in a wireless communication system, the method comprising:

transmitting, by a network, system information comprising a value;

transmitting, by the network via a downlink shared control channel, a notification for changing of the system information, wherein the notification is one of a plurality of notifications that are each transmitted during one of a plurality of modification periods, wherein each period of the plurality of modification periods has boundaries which are defined based on a System Frame Number (SFN) and the value of the system information;

transmitting by the network, when there is a change in the system information, an updated system information during a modification period of the plurality of modification periods, wherein the updated system information is transmitted via a downlink shared data channel;

wherein the transmitting of the updated system information occurs a number of times with the same content within the modification period; and

wherein changes of the system information only occur at respective modification periods of the plurality of modification periods.

15. The method of claim 14, wherein each period of the plurality of modification periods is a Broadcast Control Channel (BCCH) modification period.

16. The method of claim 14, wherein the notification is transmitted through a current Broadcast Control Channel (BCCH) modification period and the updated system information is transmitted within a next BCCH modification period.

17. The method of claim 14, wherein the notification can be transmitted through a current Broadcast Control Channel (BCCH) modification period and the updated system information is transmitted within the current BCCH modification period.

18. The method of claim 14, wherein the modification period boundaries are defined by System Frame Number (SFN).

19. The method of claim 14, wherein when there is no change in the system information, current system information is valid until a next modification period, of the plurality of modification periods.

20. The method of claim 14, wherein the modification period indicates a minimum period in which the system information can be modified.

21. The method of claim 14, wherein the modification period indicates a minimum period in which the network can change the system information.

22. The method of claim 14, wherein the modification period indicates a minimum time in which the network should wait for the next updated system information after changing the system information.

23. The method of claim 14, wherein the modification period indicates a maximum period in which the terminal determines if there is a change in the system information.