Systems and methods for selecting an antenna configuration in a mobile communication device

• US 7,499,691 B1
• Filed: 11/29/2005
• Issued: 03/03/2009
• Est. Priority Date: 11/29/2005
• Status: Expired due to Fees

• Current Assignee: DRNC Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Kyocera Wireless Corporation (Kyocera Corporation)
• Inventors: Chang, Henry, Dunn, Doug
• Primary Examiner(s): Nguyen; Lee
• Application Number:
  US11/289,061
• Time in Patent Office: 1,190 Days
• Field of Search: 455/101, 455/277.1, 455/277.2, 375/267, 375/299, 375/347
• US Class Current: 455/277.2
• CPC Class Codes: H04B 7/0814 based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Abstract

An improved smart antenna reception method and devices are provided that determine when to select a new antenna configuration in a multiple antenna configuration system. One embodiment attempts to eliminate unneeded configuration searching. Unneeded configuration searching can degrade overall signal quality and system performance. Configuration changing can be minimized by determining that a signal quality received from a first antenna configuration is below a threshold and changing antenna configuration. After changing antenna configuration, if the signal quality received from the second antenna configuration is lower than the signal quality received from the first antenna configuration the threshold can be lowered. By lowering the threshold, the probability of additional configuration changing can be reduced.

Claims

1. A method for selecting an antenna configuration in a mobile communication device, the method comprising:

monitoring the signal quality for a current antenna configuration of a plurality of antenna configurations;

searching all of the other antenna configurations of the plurality of antenna configurations when it is determined that the signal quality for the current antenna configuration has passed a threshold;

selecting the antenna configuration of the plurality of antenna configurations that has the best signal quality;

determining whether the signal quality for the selected antenna configuration is better than the signal quality for the current antenna configuration; and

excluding the selected antenna configuration from future searching, when it is determined that the signal quality for the selected antenna configuration is not better than the signal quality for the current antenna configuration.

2. The method of claim 1, further comprising actuating a timer when it is determined that the signal quality for the selected antenna configuration is not better than the signal quality for the current antenna configuration, and continuing to monitor the signal quality for the current antenna configuration.

3. The method of claim 2, further comprising excluding the selected antenna configuration from future searching until the timer has expired.

4. The method of claim 1, further comprising continuing to monitor the signal quality for the current antenna configuration when it is determined that the signal quality for the selected antenna configuration is not better than the signal quality for the current antenna configuration.

5. The method of claim 1, further comprising changing antenna configurations to a new antenna configuration of the plurality of antenna configurations when it is determined that the signal quality for the selected antenna configuration is better than the signal quality for the current antenna configuration.

6. The method of claim 1, further comprises selectively searching a subset of all of the other antenna configurations of the plurality of antenna configurations when the signal quality for the current antenna configuration passes the threshold.

7. The method of claim 6, further comprising changing to the selected antenna configuration when it is determined that the signal quality for the selected antenna configuration is better than the signal quality for the current antenna configuration.

8. The method of claim 7, further comprising altering the threshold when it is determined that the signal quality is not better for the selected antenna configuration, and continuing to monitor the signal quality for the current antenna configuration.

9. A method for selecting an antenna configuration in a mobile communication device, the method comprising:

monitoring the signal quality for a current antenna configuration of a plurality of antenna configurations;

selectively searching at least one other antenna configuration from a subset of the plurality of antenna configurations when the signal quality for the current antenna configuration passes a threshold;

grouping the plurality of antenna configurations and associating each of the groups with one of a plurality of thresholds;

determining whether the signal quality for the at least one other selectively searched antenna configuration is better than the signal quality for the current antenna configuration; and

excluding the at least one selectively searched antenna configuration from future searching, when it is determined that the signal quality for the at least one other selectively searched antenna configuration is not better than the signal quality for the current antenna configuration.

10. The method of claim 9, further comprising determining whether the signal quality for the current antenna configuration has passed any one of the plurality of thresholds and, when it determined that the signal quality for the current antenna configuration has passed one of the plurality of thresholds, determining whether the signal quality for one of the antenna configurations from the group associated with that threshold is better than the signal quality for the current antenna configuration.

11. The method of claim 10, further comprising altering at least one of the plurality of thresholds when it is determined that the signal quality is not better for one of the antenna configurations from the group and continuing to monitor the signal quality for the current antenna configuration.

12. A method for selecting an antenna configuration in a mobile communication device, the method comprising:

monitoring the signal quality for a current antenna configuration of a plurality of antenna configurations;

selectively searching a subset of the plurality of antenna configurations when the signal quality for the current antenna configuration passes a threshold; and

altering the threshold when it is determined that none of the searched subset antenna configurations has better signal quality than the current antenna configuration.

13. A mobile communication device comprising:

a plurality of antenna configurations, each of the plurality of antenna configurations configured to send wireless signals, receive wireless signals, or both;

a memory configured to store instructions; and

a processor coupled with the memory, the processor configured to access the memory and execute the instructions, the instructions configured to cause the processor to;

monitor the signal quality for the current antenna configuration;

determine that the signal quality for the current antenna configuration has passed a threshold;

determine whether the signal quality for another antenna configuration of the plurality of antenna configurations is better than the signal quality for the current antenna configuration, when it is determined that the signal quality for the current antenna configuration has passed the threshold;

alter the threshold when it is determined that the signal quality is not better for any of the other antenna configurations; and

continue to monitor the signal quality for the current antenna configuration when it is determined that the signal quality for any of the other antenna configurations is not better than the signal quality for the current antenna configuration.

14. The mobile communication device of claim 13, wherein the instructions are further configured to cause the processor to select a new antenna configuration from the plurality of antenna configurations when it is determined that the signal quality for one of the other antenna configurations of the plurality of antenna configurations is better than the signal quality for the current antenna configuration.

15. The mobile communication device of claim 13, wherein the instructions are further configured to cause the processor to:

monitor the signal quality for all of the other antenna configurations of the plurality of antenna configurations when it is determined that the signal quality for the current antenna configuration has passed the threshold;

control an antenna configuration control so as to select an antenna configuration of the plurality of antenna configurations that has the best signal quality; and

determine whether the signal quality for the selected antenna configuration is better than the signal quality for the current antenna configuration.

16. The mobile communication device of claim 15, wherein the instructions are further configured to cause the processor to control a switch so as to switch to the selected antenna configuration when it is determined that the signal quality for the selected antenna configuration is better than the signal quality for the current antenna configuration.

17. The mobile communication device of claim 16, wherein the instructions are further configured to cause the processor to alter the threshold when it is determined that the signal quality for the selected antenna configuration is not better than the signal quality for the current antenna configuration, and continuing to monitor the signal quality for the current antenna configuration.

18. The mobile communication device of claim 17, further comprising a timer, and wherein the instructions are further configured to cause the processor to actuate the timer when it is determined that the signal quality for the selected antenna configuration is not better than the signal quality for the current antenna configuration, and continue to monitor the signal quality for the current antenna configuration.

19. The mobile communication device of claim 18, wherein the instructions are further configured to cause the processor to exclude the selected antenna configurations of the plurality of antenna configurations until the timer has expired.

20. The mobile communication device of claim 13, wherein the instructions are further configured to cause the processor to group the other antenna configurations of the plurality of antenna configurations and associate each of the groups with one of a plurality of thresholds.

21. The mobile communication device of claim 20, wherein the instructions are further configured to cause the processor to determine whether the signal quality for the current antenna configuration has passed any one of the plurality of thresholds and, when it determined that the signal quality for the current antenna configuration has passed one of the plurality of thresholds, determine whether the signal quality for one of the antenna configurations from the group associated with that threshold is better than the signal quality for the current antenna configuration.

22. The mobile communication device of claim 21, wherein the instructions are further configured to cause the processor to alter at least one of the plurality of thresholds when it is determined that the signal quality for one of the antenna configurations from the group is not better than the signal quality for the current antenna configuration, and continue to monitor the signal quality for the current antenna configuration.