System and method for preserving battery life for a mobile station

• US 8,619,653 B2
• Filed: 11/24/2009
• Issued: 12/31/2013
• Est. Priority Date: 05/27/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ji, Baowei, Khan, Farooq, Pi, Zhouyue
• Primary Examiner(s): Nooristany, Sulaiman
• Application Number:
  US12/592,408
• Publication Number:
  US 20100302980A1
• Time in Patent Office: 1,498 Days
• Field of Search: 370/311
• 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 comprising processing circuitry configured to:

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

upon a determination that the battery level is below the selected power level threshold, send a battery report describing the battery level is below the selected power level threshold to a first base station of the wireless communication network, and enter a battery power preservation mode;

in case of handover being triggered, conduct the handover from the first station to a second base station, maintaining the battery power preservation mode;

determine if the battery level of the mobile station rises to the selected power level threshold;

upon a determination that the battery level of the mobile station rises to the selected power level threshold, send a cancellation message cancelling the battery report to either the first base station or the second base station if the handover has been conducted, and exit the battery power preservation mode; and

upon receiving a denial of entering the battery power preservation mode from the base station, refrain from entering the power reservation 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 5, wherein the mobile station is further configured to start from an initial sleep cycle length upon entering the enhanced sleep mode and increase a length of the sleep cycle when no traffic occurs until a maximum sleep cycle length is reached.

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 comprising processing circuitry configured to:

receive a battery report describing a battery level is below a selected power level threshold from a first of the mobile stations;

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

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;

transmit information associated with the battery report to a target base station in case of a handover of the mobile station from the base station to the target base station;

receive a cancellation message canceling the battery report from the first of the mobile stations;

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

determine that the first mobile station abused a previous battery power preservation mode, and deny the request to enter the battery power preservation mode.

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 13, wherein the base station is further configured to start from an initial sleep cycle length upon entering the enhanced sleep mode and increase a length of the sleep cycle when no traffic occurs until a maximum sleep cycle length is reached.

16. 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.

17. 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 comprising processing circuitry 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;

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;

transmit information associated with the battery report to a target base station in case of a handover of the mobile station from the base station to the target base station;

receive a cancellation message cancelling the battery report from the first of the mobile stations;

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

determine that the first mobile station abused a previous battery power preservation mode, and deny the request to enter the battery power preservation mode.

18. The wireless communication network as set forth in claim 17, wherein the plurality of power level thresholds comprises a data threshold, a video threshold, and a voice threshold.

19. The wireless communication network as set forth in claim 17, 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.

20. The wireless communication network as set forth in claim 17, 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.

21. The wireless communication network as set forth in claim 17, 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.