Paging indicator deciding method of mobile communication terminal

• US 20050020292A1
• Filed: 07/23/2004
• Published: 01/27/2005
• Est. Priority Date: 07/25/2003
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Te-Hyun
• Granted Patent: US 7,228,107 B2
• Time in Patent Office: Days
• US Class Current: 455/515
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A paging indicator deciding method of a mobile communication terminal in which a threshold value for deciding a paging indicator is variably set according to a SNR of a pilot channel. If the SNR of the pilot channel is in a range that a false alarm rate (FAR) has a large value, the mobile terminal determines a threshold value so that it can have the greatest value in a range that a miss probability (MP) does not exceed the standard value. If the SNR of the pilot channel is not in the range that the SNR has the large value, the mobile terminal determines a threshold value to obtain the smallest MP in a range that the FAR is not further increased.

Claims

1. A method for determining a paging indicator of a mobile terminal, comprising:

comparing a ratio between a paging indicator SNR (Signal-to-Noise Ratio) estimate value and a pilot channel SNR estimate value with a threshold value; and

variably setting the threshold value based on a SNR of the pilot channel.

2. The method of claim 1, further comprising:

expressing a probability distribution function as a ratio between the paging indicator SNR estimate value and the pilot channel SNR estimate value,

wherein the threshold value is determined so that a Miss Probability (MP) has a greatest value in a range that the MP does not exceed a maximum standard value.

3. The method of claim 2, wherein the maximum standard value is 0.005 or 0.001.

4. The method of claim 2, wherein, when the pilot channel SNR estimate value is in a range that a False Alarm Rate (FAR) is smaller than a predetermined value, the threshold value is determined so a smallest MP is obtained in a range that the FAR does not further increase.

5. The method of claim 4, wherein the predetermined value is 0.

6. The method of claim 1, wherein if the pilot channel SNR estimate value is in a range that a False Alarm Rate (FAR) is increased greater than a predetermined value, the mobile terminal switches to a mode for demodulating a page message.

7. The method of claim 6, wherein the predetermined value includes 20%.

8. A method for determining a paging indicator of a mobile terminal, comprising:

variably setting a threshold value used to determine whether or not the paging indicator indicates to demodulate a page message based on a SNR (Signal-to-Noise Ratio) of a pilot channel.

9. The method of claim 8, further comprising:

comparing a ratio between a paging indicator SNR value and a pilot channel SNR value with the threshold value.

10. The method of claim 8, further comprising:

expressing a probability distribution function as a ratio between the paging indicator SNR value and the pilot channel SNR value,

wherein the threshold value is determined so that a Miss Probability (MP) has a greatest value in a range that the MP does not exceed a maximum standard value.

11. The method of claim 10, wherein the maximum standard value is 0.005 or 0.001.

12. The method of claim 10, wherein, when the pilot channel SNR value is in a range that a False Alarm Rate (FAR) is smaller than a predetermined value, the threshold value is determined so a smallest MP is obtained in a range that the FAR does not further increase.

13. The method of claim 12, wherein the predetermined value is 0.

14. The method of claim 8, wherein if the pilot channel SNR value is in a range that a False Alarm Rate (FAR) is increased greater than a predetermined value, the mobile terminal switches to a mode for demodulating a page message.

15. The method of claim 14, wherein the predetermined value includes 20%.

16. A mobile terminal, comprising:

a threshold unit configured to variably set a threshold value used to determine whether or not a paging indicator indicates to demodulate a page message based on a SNR (Signal-to-Noise Ratio) of a pilot channel.

17. The mobile terminal of claim 16, further comprising:

a paging indicator SNR unit configured to estimate a SNR of the paging indicator;

a pilot channel SNR unit configured to estimate a SNR of a pilot channel; and

a processor configured to compare a ratio between the paging indicator SNR and the pilot channel SNR with the threshold value.

18. The mobile terminal of claim 17, wherein the processor expresses a probability distribution function as a ratio between the paging indicator SNR and the pilot channel SNR, and

wherein the threshold value is determined so that a Miss Probability (MP) has a greatest value in a range that the MP does not exceed a maximum standard value.

19. The mobile terminal of claim 18, wherein the maximum standard value is 0.005 or 0.001.

20. The mobile terminal of claim 18, wherein, when the pilot channel SNR is in a range that a False Alarm Rate (FAR) is smaller than a predetermined value, the threshold value is determined so a smallest MP is obtained in a range that the FAR does not further increase.

21. The mobile terminal of claim 20, wherein the predetermined value is 0.

22. The mobile terminal of claim 16, wherein if the pilot channel SNR value is in a range that a False Alarm Rate (FAR) is increased greater than a predetermined value, the mobile terminal switches to a mode for demodulating a page message.

23. The mobile terminal of claim 22, wherein the predetermined value includes 20%.