METHOD AND SYSTEM FOR COORDINATING A SLEEP MODE WAKE-UP TIME

• US 20080004044A1
• Filed: 06/29/2006
• Published: 01/03/2008
• Est. Priority Date: 06/29/2006
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Simpson, Floyd D., Wang, Huai Y.
• Granted Patent: US 7,577,449 B2
• Time in Patent Office: Days
• US Class Current: 455/458
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• 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: Y02D 30/70 in wireless communication networks

Abstract

The invention concerns a method (200) and system (100) for coordinating a sleep mode wake-up time. The method can include the steps of entering (214) a sleep mode and selecting (214) a paging group, advising (216) a base station (110) of the sleep mode and the selection of the paging group and coordinating (218) a wake-up time of the sleep mode with a second power saving mode that includes a common availability time (312) for mobile stations (116) communicating with the base station to detect signals from the base station. As an example, the second power saving mode (300) can be an idle mode, and the common availability time can be a listening interval of the idle mode.

Claims

1. A method for coordinating a sleep mode wake-up time, comprising:

entering a sleep mode and selecting a paging group;

advising a base station of the sleep mode and the selection of the paging group; and

coordinating a wake-up time of the sleep mode with a second power saving mode that includes a common availability time for mobile stations communicating with the base station to detect signals from the base station.

2. The method according to claim 1, wherein the second power saving mode is an idle mode and the common availability time is a listening interval of the idle mode.

3. The method according to claim 2, wherein the paging group is one of a number of paging groups that are set by the base station for the idle mode and the method further comprises:

transmitting a location update to the base station; and

in response, receiving information about the paging groups set by the base station.

4. The method according to claim 1, further comprising receiving an indication during the common availability time that indicates the presence of traffic intended for a mobile station.

5. The method according to claim 4, wherein the indication is a paging message.

6. The method according to claim 1, further comprising maintaining a registration with the base station during the entering, advising and coordinating steps.

7. The method according to claim 2, wherein the idle mode is a mode that mobile stations enter and then de-register from the base station.

8. A method for coordinating a sleep mode wake-up time, comprising:

transmitting messages for at least one group in a power saving mode;

receiving from a mobile station an indication that the mobile station has entered sleep mode and has selected one of the groups; and

transmitting the messages to the mobile station in the sleep mode during a common availability time of the power saving mode.

9. The method according to claim 8, wherein the power saving mode is an idle mode and the common availability time is a listening interval of the idle mode.

10. The method according to claim 9, wherein the message is a paging message and the groups are paging groups set by a base station for the idle mode and the method further comprises:

receiving a location update from the mobile station; and

in response, transmitting information about the paging groups set by the base station.

11. The method according to claim 10, wherein the paging message indicates the presence of traffic intended for the mobile station and the method further comprises transmitting the paging messages to the mobile station in the sleep mode only during the listening interval of the idle mode.

12. The method according to claim 8, further comprising maintaining a registration with the mobile station while the mobile station is in the sleep mode.

13. The method according to claim 9, wherein the idle mode is a mode that mobile stations enter and then de-register from a base station.

14. A mobile device, comprising:

a receiver for communicating with a base station; and

a processor that is communicatively coupled to the receiver, wherein in a sleep mode, the processor is programmed to;

instruct the receiver to selectively shut down; and

coordinate a wake-up time for the receiver with a common availability time of a second power saving mode such that the receiver activates during the common availability time to receive a message from the base station.

15. The device according to claim 14, wherein the second power saving mode is an idle mode and the common availability time is a listening interval of the idle mode.

16. The device according to claim 15, wherein the processor is further programmed to select a paging group that is set by the base station for the idle mode and the paging group has a pre-defined listening interval.

17. The device according to claim 14, wherein the message is a paging message that indicates the presence of traffic intended for the mobile device.

18. The device according to claim 14, wherein during the sleep mode, the processor is further programmed to maintain a registration with the base station.

19. A base station, comprising:

a transceiver that transmits messages for at least one group in a power saving mode and receives from a mobile station an indication that the mobile station has entered sleep mode and has selected one of the groups; and

a processor that is communicatively coupled to the transceiver, wherein the processor is programmed to—

in response to the receipt of the indication from the mobile station—

instruct the transceiver to transmit the messages to the mobile station in the sleep mode during a common availability time of the power saving mode.

20. The base station according to claim 19, wherein the power saving mode is an idle mode and the common availability time is a listening interval of the idle mode.