Apparatus and method for reporting measurement result in wireless communication system

• US 8,909,228 B2
• Filed: 11/02/2010
• Issued: 12/09/2014
• Est. Priority Date: 11/03/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Sung Min, Park, Sung Jun, Jung, Sung Hoon, Chun, Sung Duck, Yi, Seung June
• Primary Examiner(s): Magloire, Vladimir
• Assistant Examiner(s): COSME, NATASHA W
• Application Number:
  US12/917,900
• Publication Number:
  US 20110105123A1
• Time in Patent Office: 1,498 Days
• Field of Search: 455/436, 370/328
• US Class Current: 455/436
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method and apparatus of reporting a measurement result in a wireless communication system is provided. An user equipment receives a measurement parameter for measurement of a closed subscriber group (CSG) cell and measures signal quality of at least one CSG cell on the basis of the measurement parameter. The user equipment determines at least one CSG cell'"'"'s CSG identity (ID) by using system information of the at least one CSG cell and determines at least one member CSG cell having the user equipment as a member thereof from the at least one CSG cell on the basis of the at least one CSG cell'"'"'s CSG ID. The user equipment selects a member CSG cell to send a measurement report from the at least one member CSG cell, and transmits the measurement report comprising signal quality for the selected member CSG cell.

Claims

1. A method of reporting a measurement result of a user equipment in a wireless communication system, the method comprising:

receiving a measurement parameter for measuring at least one cell from a serving cell;

receiving system information from at least one neighbor cell, each of the system information of the at least one neighbor cell comprising a closed subscriber group (CSG) indicator indicating a type of a corresponding neighbor cell, each of the system information of the at least one CSG cell further comprising a CSG identity of a corresponding CSG cell;

determining whether at least one Closed Subscriber Group (CSG) cell is present among the at least one neighbor cell based on the system information of the at least one neighbor cell,

wherein, when at least one CSG indicator, indicating that the type is a CSG cell, is included in at least one piece of the system information of the at least one neighbor cell, it is determined that the at least one CSG cell is present,

wherein, when the at least one CSG indicator is not included in the at least one piece of the system information, the presence of the CSG cell is determined by comparing the at least one CSG ID with a white list, and

wherein the white list indicates an accessible CSG cell list, the accessible CSG cell list including at least one CSG identity (ID) for at least one accessible CSG cell to which the user equipment is permitted to access;

transmitting a proximity indication on the at least one CSG cell to the serving cell, when it is determined that the at least one CSG cell is present;

measuring the at least one CSG cell based on the measurement parameter;

receiving a preliminary access check indicator from the serving cell, the preliminary access check indicator indicating whether a preliminary access check is requested,

wherein the preliminary access check indicator has a length of 1 bit,

wherein, when the preliminary access check is requested,

determining at least one member CSG cell comprising the user equipment as a member thereof from at least one CSG cell based on system information of the at least one CSG cell,

selecting a target member CSG cell among the at least one member CSG cell for transmitting a measurement report for the target member CSG cell,

transmitting the measurement report to the serving cell, the measurement report comprising signal quality for the target member CSG cell,

receiving a handover command from the serving cell, the handover command being used to instruct the user equipment for performing the handover from the serving cell to the target member CSG cell, and

accessing to the target member CSG cell after receiving the handover command,

wherein the each of the system information of the at least one CSG cell is stored for a specific period of time, such that the stored system information is re-used when the user equipment re-enters the at least one CSG cell within the specific period of time.

2. The method of claim 1, wherein the measurement report further comprises a cell ID of the target member CSG cell.

3. The method of claim 2, wherein the cell ID is not a physical cell identity (PCI) of the target member CSG cell.

4. The method of claim 3, wherein the cell ID is acquired from system information of the target member CSG cell.

5. The method of claim 1, wherein the selecting of the member CSG cell comprises selecting a member CSG cell having a best signal quality as the target member CSG cell.

6. The method of claim 1, wherein the measurement report further comprises a CSG ID of the target member CSG cell.

7. A user equipment for reporting a measurement result in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit configured to transmit and receive a radio signal; and

a processor coupled to the RF unit and configured to;

receive a measurement parameter for measuring at least one cell from a serving cell;

receive system information from at least one neighbor cell, each of the system information of the at least one neighbor cell comprising a closed subscriber group (CSG) indicator indicating a type of a corresponding neighbor cell, each of the system information of the at least one CSG cell further comprising a CSG identity of a corresponding CSG cell;

determine whether at least one Closed Subscriber Group (CSG) cell is present among the at least one neighbor cell based on the system information of the at least one neighbor cell,

wherein, when at least one CSG indicator, indicating that the type is a CSG cell, is included in at least one piece of the system information of the at least one neighbor cell, it is determined that the at least one CSG cell is present,

wherein, when the at least one CSG indicator is not included in the at least one piece of the system information, the presence of the CSG cell is determined by comparing the at least one CSG ID with a white list, and

wherein the white list indicates an accessible CSG cell list, the accessible CSG cell list including at least one CSG identity (ID) for at least one accessible CSG cell to which the user equipment is permitted to access;

transmit a proximity indication on the at least one CSG cell to the serving cell, when it is determined that the at least one CSG cell is present;

measure the at least one CSG cell based on the measurement parameter;

receive a preliminary access check indicator from the serving cell, the preliminary access check indicator indicating whether a preliminary access check is requested,

wherein the preliminary access check indicator has a length of 1 bit,

wherein, when the preliminary access check is requested,

determine at least one member CSG cell comprising the user equipment as a member thereof from at least one CSG cell based on system information of the at least one CSG cell,

select a target member CSG cell among the at least one member CSG cell for transmitting a measurement report for the target member CSG cell,

transmit the measurement report to the serving cell, the measurement report comprising signal quality for the target member CSG cell,

receive a handover command from the serving cell, the handover command being used to instruct the user equipment for performing the handover from the serving cell to the target member CSG cell, and

access to the target member CSG cell after receiving the handover command,

wherein the each of the system information of the at least one CSG cell is stored for a specific period of time, such that the stored system information is re-used when the user equipment re-enters the at least one CSG cell within the specific period of time.

8. The user equipment of claim 7, wherein the measurement report further comprises a cell ID of the target member CSG cell.

9. The user equipment of claim 7, wherein the selecting the target member cell includes selecting a member CSG cell having best signal quality as the target member CSG cell.

10. The user equipment of claim 7, wherein the measurement report further comprises a CSG ID of the target member CSG cell.