METHOD OF LOW DUTY MODE OPERATION FOR FEMTO BASE STATION

• US 20100309849A1
• Filed: 06/08/2010
• Published: 12/09/2010
• Est. Priority Date: 06/09/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ryu, Ki Seon, Yuk, Young Soo, Park, Gi Won, Kwak, Jin Sam, Kim, Yong Ho
• Granted Patent: US 8,811,277 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of an efficient low duty mode (LDM) operation for a femto base station is disclosed. The method of a low duty mode (LDM) operation for a femto base station comprises operating at an available interval of a first length according to a default LDM pattern; and operating at an unavailable interval of a second length according to the default LDM pattern, wherein the available interval begins with a frame including a first preamble, the first preamble including information of carrier configuration and system bandwidth.

Claims

1. A method of a low duty mode (LDM) operation for a femto base station, the method comprising:

operating at an available interval of a first duration according to a default LDM pattern; and

operating at an unavailable interval of a second duration according to the default LDM pattern,

wherein the available interval begins with a frame including a first preamble, the first preamble including information of carrier configuration and system bandwidth.

2. The method of claim 1, wherein the femto base station enters the low duty mode if there are no mobile stations attached to the femto base station and there are no mobile stations in the process of network entry.

3. The method of claim 1, further comprising synchronizing with an overlay macro base station, wherein the first preamble and the second preamble are transmitted at the same time when the preambles are transmitted from the overlay macro base station.

4. The method of claim 1, wherein the first duration and the second duration are respectively set in units of four frames.

5. The method of claim 4, wherein one unit of the available interval includes one first preamble, three second preambles, and one superframe header.

6. The method of claim 5, wherein the first preamble is a PA preamble (primary advanced-preamble), and the second preamble is a secondary advanced-preamble that includes cell ID and base station type information.

7. The method of claim 1, wherein information of the LDM pattern is pre-provisioned between the femto base station and a mobile station, or is transmitted to the mobile station through a registration response (AAI_REG-RSP) message.

8. The method of claim 7, wherein the information of the default low duty mode pattern includes the available interval, the unavailable interval, and a start superframe number indicating from where the low duty mode operation starts.

13. The method of claim 1, wherein information of the LDM pattern is pre-provisioned between the femto base station and the mobile station, or is transmitted to the mobile station through a registration response (AAI_REG-RSP) message.

9. A method of scanning a femto base station operated at a low duty mode (LDM) through a mobile station, the method comprising:

receiving a first preamble, which includes information of carrier configuration and system bandwidth, from an available interval of a first duration according to a default LDM pattern; and

receiving a second preamble, which includes cell ID and base station type information, during the available interval; and

receiving a superframe header during the available interval,

wherein the available interval begins with a frame including the first preamble.

10. The method of claim 9, wherein the first duration is set in units of four frames.

11. The method of claim 10, wherein one unit of the available interval includes one first preamble, three second preambles, and one superframe header.

12. The method of claim 11, wherein the first preamble is a PA preamble (primary advanced-preamble), and the second preamble is a secondary advanced-preamble.

14. A mobile station comprising:

a processor; and

a radio frequency (RF) module transmitting and receiving a radio signal to and from the outside under the control of the processor,

wherein the processor controls the RF module and scans the femto base station by receiving a first preamble, which includes information of carrier configuration and system bandwidth, a second preamble, which includes cell ID and base station type information, and a superframe header during an available interval according to a default LDM pattern of a femto base station operated at a low duty mode, and

the available interval begins with a frame including the first preamble.

15. The mobile station of claim 14, wherein the first duration is set in units of four frames.

16. The mobile station of claim 15, wherein one unit of the available interval includes one first preamble, three second preambles, and one superframe header.

17. The mobile station of claim 14, wherein the first preamble is a PA preamble (primary advanced-preamble), and the second preamble is a secondary advanced-preamble.

18. The method of claim 14, wherein information of the LDM pattern is pre-provisioned between the femto base station and the mobile station, or is transmitted to the mobile station through a registration response (AAI_REG-RSP) message.