Method for UE pattern indication and measurement for interference coordination

• US 9,072,110 B2
• Filed: 11/07/2011
• Issued: 06/30/2015
• Est. Priority Date: 11/08/2010
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Chen, Yih-Shen, Johansson, Per Johan Mikael
• Primary Examiner(s): Eng, George
• Assistant Examiner(s): HUYNH, NAM TRUNG
• Application Number:
  US13/373,218
• Publication Number:
  US 20120115469A1
• Time in Patent Office: 1,331 Days
• Field of Search: 455443-444, 455/425, 455/434, 455/67.11, 455/552.1, 455446-449
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/0094 Definition of hand-off measurement parameters
• CPC Class Codes: H04W 48/02 Access restriction performed under specific conditions
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method of inter-cell interference coordination is provided for UE measurements and network access procedure. In a first embodiment, a UE in idle mode performs measurements on received radio signals applying a simplified radio resource restriction for interference coordination. The UE determines the restricted radio resource without receiving explicit measurement configuration. In a second embodiment, during various phases of a network access procedure, the UE indicates its interference status and/or additional interference information to its serving base station to enhance interference coordination. In a third embodiment, the UE in connected mode performs measurements on both interference-protected transmission resources and non-interference-protected transmission resources. The UE measurement results are used for scheduling, radio link monitoring, and/or mobility management to increase radio spectrum efficiency and to improve user experience.

Claims

1. A method comprising:

receiving radio signals of a cell under measurement by a user equipment (UE) in a wireless communication system, wherein the UE is in idle mode;

detecting a plurality of interfered radio resources by the UE for interference coordination, wherein the UE receives strong interfering signals from a non-accessible neighboring cell;

determining a plurality of restricted radio resources by excluding the plurality of interfered radio resources from radio resources of the wireless communication system, wherein the plurality of restricted radio resources is autonomously determined to be a subset of subframes in time domain of interference-protected radio resources of cell, and wherein the restricted radio resources correspond to subframes used for system broadcast channels, paging channels and downlink common control channel; and

performing measurements of the cell using the determined restricted radio resources.

2. The method of claim 1, wherein the neighboring cell is a close subscriber group (CGS) femtocell in the vicinity of the cell.

3. The method of claim 1, wherein the restricted radio resources belong to a subset of radio resources that are used for data transmission and reception if the UE is measuring the cell as serving cell candidate.

4. The method of claim 1, wherein the restricted radio resources are determined without receiving explicit measurement configuration.

5. The method of claim 1, wherein the UE performs the measurements for cell selection/re-selection.

6. A user equipment (UE) comprising:

an antenna that receives radio signals of a cell under measurement in a wireless communication system, wherein the UE is in idle mode;

a radio frequency (RF) module that detects a plurality of interfered radio resources for interference coordination, wherein the UE receives strong interfering signals from a non-accessible neighboring cell;

a processor that determines a plurality of restricted radio resources by excluding the plurality of interfered radio resources from radio resources of the wireless communication system, wherein the plurality of restricted radio resources is autonomously determined to be a subset of subframes in time domain of interference-protected radio resources of the cell, and wherein the restricted radio resources correspond to subframes used for system broadcast channels, paging channels and downlink common control channel; and

a measurement module that performs measurements of the cell using the determined restricted radio resources.

7. The UE of claim 6, wherein the neighboring cell is a close subscriber group (CGS) femtocell in the vicinity of the cell.

8. The UE of claim 6, wherein the restricted radio resources belong to a subset of radio resources that are used for data transmission and reception if the UE is measuring the cell as serving cell candidate.

9. The UE of claim 6, wherein the restricted radio resources are determined without receiving explicit measurement configuration.

10. The UE of claim 6, wherein the UE performs the measurements for cell selection/re-selection.