System and method for preserving battery life for a mobile station

• US 20100302980A1
• Filed: 11/24/2009
• Published: 12/02/2010
• Est. Priority Date: 05/27/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Khan, Farooq, Pi, Zhouyue, Ji, Baowei
• Granted Patent: US 8,619,653 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0261 managing power supply demand, e.g. depending on battery level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile station capable of accessing a wireless communication network having a plurality of base stations is provided. The mobile station is configured to determine if a battery level of the mobile station is below a selected one of a plurality of power level thresholds. The mobile station is also configured to, upon a determination that the battery level is below the selected power level threshold, send a battery report to a first base station of the wireless communication network. The mobile station is further configured to enter a battery power preservation mode. The battery power preservation mode may include an enhanced idle mode, an enhanced sleep mode, or a persistent allocation mode.

Claims

1. A mobile station capable of accessing a wireless communication network comprising a plurality of base stations, the mobile station configured to:

determine if a battery level of the mobile station is below a selected one of a plurality of power level thresholds; and

upon a determination that the battery level is below the selected power level threshold;

send a battery report to a first base station of the wireless communication network; and

enter a battery power preservation mode.

2. The mobile station as set forth in claim 1, wherein the plurality of power level thresholds comprises a data threshold, a video threshold, and a voice threshold.

3. The mobile station as set forth in claim 1, wherein the battery report comprises a request to enter the battery power preservation mode.

4. The mobile station as set forth in claim 1, wherein the battery power preservation mode is an enhanced idle mode having a paging cycle, wherein an available interval in the paging cycle is set to a minimum value.

5. The mobile station as set forth in claim 1, wherein the battery power preservation mode is an enhanced sleep mode having a sleep cycle, wherein a listening interval in the sleep mode is set a minimum value.

6. The mobile station as set forth in claim 1, wherein the battery power preservation mode is a persistent allocation mode, wherein each time period in a plurality of time periods is divided into a plurality of downlink subframes, and only a selected number of downlink subframes are monitored in each time period.

7. The mobile station as set forth in claim 1, the mobile station further configured to:

send a cancellation message to the first base station, the cancellation message cancelling the battery report.

8. The mobile station as set forth in claim 1, wherein when the mobile station is in the battery power preservation mode, the mobile station is further configured to:

determine if the battery level is below a second threshold; and

upon a determination that the battery level is below the second threshold, send a second battery report to the first base station, the second battery report comprising a request for additional battery preservation services in the battery power preservation mode.

9. A base station in a wireless communication network, the base station capable of communicating with a plurality of mobile stations, the base station configured to:

receive a battery report from a first of the mobile stations;

determine if the first mobile station is eligible to enter a battery power preservation mode; and

upon a determination that the first mobile station is eligible to enter the battery power preservation mode, enter the battery power preservation mode for the first mobile station.

10. The base station as set forth in claim 9, wherein the plurality of power level thresholds comprises a data threshold, a video threshold, and a voice threshold.

11. The base station as set forth in claim 9, wherein the battery report comprises a request to enter the battery power preservation mode.

12. The base station as set forth in claim 9, wherein the battery power preservation mode is an enhanced idle mode having a paging cycle, wherein an available interval in the paging cycle is set to a minimum value.

13. The base station as set forth in claim 9, wherein the battery power preservation mode is an enhanced sleep mode having a sleep cycle, wherein a listening interval in the sleep mode is set a minimum value.

14. The base station as set forth in claim 9, wherein the battery power preservation mode is a persistent allocation mode, wherein each time period in a plurality of time periods is divided into a plurality of downlink subframes, and only a selected number of downlink subframes are monitored in each time period.

15. The base station as set forth in claim 9, the base station further configured to:

receive a cancellation message from the first mobile station, the cancellation message cancelling the battery report.

16. The base station as set forth in claim 9, the base station further configured to:

determine that the first mobile station abused a previous battery power preservation mode; and

deny the request to enter the battery power preservation mode.

17. The base station as set forth in claim 9, the base station further configured to:

transmit information associated with the battery report to a target base station before a handover of the mobile station from the base station to the target base station.

18. A wireless communication network comprising a plurality of base stations, each base station capable of communicating with a plurality of mobile stations, each base station is configured to:

receive a battery report from a first of the mobile stations;

determine if the first mobile station is eligible to enter a battery power preservation mode; and

upon a determination that the first mobile station is eligible to enter the battery power preservation mode, enter the battery power preservation mode for the first mobile station.

19. The wireless communication network as set forth in claim 18, wherein the plurality of power level thresholds comprises a data threshold, a video threshold, and a voice threshold.

20. The wireless communication network as set forth in claim 18, wherein the battery power preservation mode is an enhanced idle mode having a paging cycle, wherein an available interval in the paging cycle is set to a minimum value.

21. The wireless communication network as set forth in claim 18, wherein the battery power preservation mode is an enhanced sleep mode having a sleep cycle, wherein a listening interval in the sleep mode is set a minimum value.

22. The wireless communication network as set forth in claim 18, wherein the battery power preservation mode is a persistent allocation mode, wherein each time period in a plurality of time periods is divided into a plurality of downlink subframes, and only a selected number of downlink subframes are monitored in each time period.

23. The wireless communication network as set forth in claim 18, each base station further configured to:

transmit information associated with the battery report to a target base station before a handover of the mobile station from the base station to the target base station.