METHOD FOR TRANSMITTING UPLINK SIGNAL AND APPARATUS THEREFOR

• US 20140050102A1
• Filed: 03/30/2012
• Published: 02/20/2014
• Est. Priority Date: 04/03/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Youngdae, Jung, Sunghoon, Yi, Seungjune, Chun, Sungduck, Park, Sungjun
• Granted Patent: US 9,432,856 B2
• Time in Patent Office: Days
• US Class Current: 370/242
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

In the present invention, a user equipment measures a wireless signal from a specific cell, and decides whether to store and/or report to a base station information on a wireless link failure, if the wireless link failure occurs, depending on the type of a cell which is measured or the type of a frame in which the wireless link failure occurs. According to the present invention, the user equipment can be prevented from reporting unnecessary information to a network.

Claims

1. A method for determining, by a user equipment, whether to transmit signals in a radio communication system, comprising:

detecting a radio link failure for a first cell in at least one frame; and

determining whether to transmit a report on the radio link failure to a network according to at least one of a type of the first cell and a type of the at least one frame.

2. The method according to claim 1, wherein the report on the radio link failure is not transmitted to the network if at least one of the type of the first cell and the type of the at least one frame is corresponding to a specific type.

3. The method according to claim 2, wherein the type of the first cell is a closed subscriber group (CSG) cell.

4. The method according to claim 3, wherein information about the radio link failure is not stored.

5. The method according to claim 1, wherein the report on the radio link failure is transmitted to the network if at least one of the type of the first cell and the type of the at least one frame is not corresponding to a specific type.

6. The method according to claim 5, wherein the report on the radio link failure is transmitted to the network through a second cell different from the first cell and the first cell has a public land mobile network (PLMN) identifier different from the second cell.

7. The method according to claim 5, wherein information about the radio link failure is stored.

8. The method according to claim 7, wherein the information about the radio link failure includes at least one of information about the type of the cell and information about the type of the at least one frame.

9. The method according to claim 2, wherein the type of the at least one frame is an almost blank subframe (ABS).

10. The method according to claim 7, wherein, the report on the radio link failure is stored when the user equipment transitions to a radio resource control (RRC) idle state, and the report on the radio link failure is transmitted to the network when the user equipment transitions to an RRC connected state.

11. The method according to claim 5, further comprising:

receiving a radio link failure reporting request message from the network and transmitting the report on the radio link failure to the network through a second cell different from the first cell.