Power management for multi-carrier transmission

• US 20110013548A1
• Filed: 09/21/2010
• Published: 01/20/2011
• Est. Priority Date: 09/05/2008
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Hsu, Chung-Hsien, Chen, Yih-Shen
• Granted Patent: US 8,489,152 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of power management for a mobile station in a multi-carrier wireless network is provided. A primary connection between the mobile station and a serving base station is first established by performing initial ranging over a primary radio frequency (RF) carrier. A secondary connection between the mobile station and the base station is then established by performing periodic ranging over a secondary RF carrier. To achieve efficient power management, the mobile station performs Open Loop Power Control and obtains long-term link measurement (CSI) of the primary carrier. The mobile station then adjusts carrier-specific parameters based on the primary carrier CSI. For RF carriers that convey on-going data traffic, Close Loop Power Control is updated per RF carrier. When the mobile station enters sleep mode operation, it receives traffic indication messages on the primary RF carrier and then dynamically wakes up one or more corresponding RF carriers for data reception.

Claims

1. A method of power management for a mobile station in a multi-carrier wireless network, the method comprising:

establishing a primary connection between the mobile station and a base station over an activated primary radio frequency (RF) carrier;

establishing a secondary connection between the mobile station and the base station over an activated secondary RF carrier;

negotiating a set of sleep mode parameters for the primary connection;

entering sleep mode operation and receiving a traffic indication message on the activated primary RF carrier; and

waking up one or more activated secondary RF carriers for data reception.

2. The method of claim 1, wherein the same set of sleep mode parameters is used for both the primary connection and the secondary connection.

3. The method of claim 2, wherein the set of sleep mode parameters comprises sleep cycle length, listening window length, and whether traffic indication is transmitted during each listening window.

4. The method of claim 1, wherein the primary RF carrier is always activated so that the mobile station uses the primary RF carrier to execute traffic indication.

5. The method of claim 1, wherein the mobile station receives a wakeup indication message that identifies the one or more activated RF carriers.

6. The method of claim 5, wherein the wakeup indication message has a bitmap format, and wherein each bit is used to identify the one or more activated RF carriers.

7. The method of claim 5, wherein the wakeup indication message is either an independent MAC massage, or part of the traffic indication message.

8. The method of claim 5, wherein the one or more activated RF carriers wake up for data reception after receiving the wakeup indication message plus a wakeup time.

9. The method of claim 8, wherein the waked RF carriers begin transmission or receptions after the wakeup time.

10. The method of claim 8, wherein the wakeup time is a parameter exchanged between the mobile station and the base station via either network entry procedure or sleep mode negotiation process.

11. The mobile station in a multi-carrier wireless network, comprising:

one or more radio frequency (RF) modules operable over a primary RF carrier and a secondary RF carrier; and

a sleep mode operation module that negotiates a set of sleep mode parameters with a base station for the primary RF carrier and thereby establishes sleep mode operation, wherein the mobile station enters sleep mode and receives a traffic indication message on the primary RF carrier, and wherein at least one of the one or more RF modules are waken up for data reception.

12. The mobile station of claim 11, wherein the same set of sleep mode parameters is used for both the primary RF carrier and the secondary RF carrier,

13. The mobile station of claim 12, wherein the set of sleep mode parameters comprises sleep cycle length, listening window length, and whether traffic indication is enabled during each listening window.

14. The mobile station of claim 11, wherein the primary RF carrier is always activated so that the mobile station uses the primary RF carrier to execute traffic indication.

15. The mobile station of claim 11, wherein the one or more RF modules are operable over one or more corresponding activated RF carriers identified by a wakeup indication message from the base station.

16. The mobile station of claim 15, wherein the wakeup indication message has a bitmap format, and wherein each bit is used to identify the one or more activated RF carriers.

17. The mobile station of claim 15, wherein the wakeup indication message is either an independent MAC massage, or part of the traffic indication message.

18. The mobile station of claim 15, wherein the one or more RF modules wake up for data reception after receiving the wakeup indication message plus a wakeup time.

19. The mobile station of claim 18, wherein the waked RF modules conduct transmission or reception after the wakeup time.

20. The mobile station of claim 18, wherein the wakeup time is a parameter exchanged between the mobile station and the base station via either network entry procedure or sleep mode negotiation process.