Quasi co-location identification of reference symbol ports for coordinated multi-point communication systems

• US 9,867,120 B2
• Filed: 12/15/2014
• Issued: 01/09/2018
• Est. Priority Date: 04/19/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ng, Boon Loong, Sayana, Krishna, Nam, Young-Han, Zhang, Jianzhong
• Primary Examiner(s): Phan, Man
• Application Number:
  US14/571,147
• Publication Number:
  US 20150201369A1
• Time in Patent Office: 1,121 Days
• Field of Search: 370237-352, 455445-560
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2665 Fine synchronisation, e.g. by positioning the FFT window
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 64/003 locating network equipment

Abstract

Methods and apparatuses indicate and identify quasi co-located reference signal ports. A method of identifying by a UE includes identifying, from downlink control information, a CSI-RS port that is quasi co-located with a DM-RS port assigned to the UE. The method includes identifying large scale properties for the assigned DM-RS port based on large scale properties for the CSI-RS port. The method includes performing channel estimation and/or time/frequency synchronization using the identified large scale properties for the DM-RS port. Another method for identifying by a UE includes identifying, from downlink control information, a CRS port that is quasi co-located with a CSI-RS port configured for the UE. The method includes identifying large scale properties for the configured CSI-RS port based on large scale properties for the CRS port. The method includes performing channel estimation and/or time/frequency synchronization using the identified large scale properties for the CSI-RS port.

Claims

1. A method for receiving reference signals by an user equipment (UE), the method comprising:

receiving channel state information reference signal (CSI-RS) configuration information including a CSI-RS configuration identifier (ID), a resource configuration, a subframe configuration, and quasi co-location (QCL) cell-specific reference signal (CRS) information; and

receiving a CSI-RS and a CRS corresponding to the CSI-RS configuration information based on the CSI-RS configuration information,

wherein the QCL CRS information indicates the CRS corresponding to the CSI-RS configuration information that is quasi co-located with the CSI-RS corresponding to the CSI-RS configuration information.

2. The method of claim 1, further comprising:

receiving interference measurement (IM) resource configuration information including an IM configuration ID, an IM resource configuration, and an IM subframe configuration; and

receiving CSI process configuration information including a CSI process ID, the CSI-RS configuration ID, and the IM configuration ID.

3. The method of claim 1, further comprising:

receiving a control channel including demodulation reference signal (DMRS) information and QCL information; and

receiving a data channel indicated by the control channel, based on at least one DMRS port corresponding to the DMRS information and at least one CSI-RS port corresponding to the QCL information,

wherein the at least one DMRS port corresponding to the DMRS information and at least one CSI-RS port corresponding to the QCL information is quasi co-located.

4. The method of claim 3, further comprising receiving CSI-RS information associated with values of the QCL information.

5. The method of claim 1, wherein:

the CRS corresponding to the CSI-RS configuration information that is quasi co-located with the CSI-RS corresponding to the CSI-RS configuration information means that large scale properties for the CRS can be inferred from large scale properties for the CSI-RS, and

the large scale properties for the CRS include at least one of a Doppler shift, a Doppler spread, an average delay, or a delay spread.

6. The method of claim 1, further comprising:

receiving QCL type information; and

assuming that all CRSs, CSI-RSs, and DMRSs may be assumed as quasi co-located when the QCL type information is a first type.

7. The method of claim 3, further comprising:

receiving QCL type information; and

assuming that the at least one DMRS port corresponding to the DMRS information and at least one CSI-RS port corresponding to the QCL information are quasi co-located when the QCL type information is a second type.

8. An apparatus for receiving reference signals by an user equipment (UE), the apparatus comprising:

a controller; and

receiver processing circuitry configured to;

receive channel state information reference signal (CSI-RS) configuration information including a CSI-RS configuration identifier (ID), a resource configuration, a subframe configuration, and quasi co-location (QCL) cell-specific reference signal (CRS) information; and

receive a CSI-RS and a CRS corresponding to the CSI-RS configuration information based on the CSI-RS configuration information,

wherein the QCL CRS information indicates the CRS corresponding to the CSI-RS configuration information that is quasi co-located with the CSI-RS corresponding to the CSI-RS configuration information.

9. The apparatus of claim 8, wherein the receiver processing circuitry is further configured to:

receive interference measurement (IM) resource configuration information including an IM configuration ID, an IM resource configuration, and an IM subframe configuration; and

receive CSI process configuration information including a CSI process ID, the CSI-RS configuration ID, and the IM configuration ID.

15. The apparatus of claim 8, wherein:

the CRS corresponding to the CSI-RS configuration information that is quasi co-located with the CSI-RS corresponding to the CSI-RS configuration information means that large scale properties for the CRS can be inferred from large scale properties for the CSI-RS, and

the large scale properties for the CRS include at least one of a Doppler shift, a Doppler spread, an average delay, or a delay spread.

16. The apparatus of claim 8, wherein:

the receiver processing circuitry is further configured to receive QCL type information; and

the controller is configured to assume that all CRSs, CSI-RSs, and DMRSs may be assumed as quasi co-located when the QCL type information is a first type.

10. An apparatus, for receiving reference signals by an user equipment (UE), the apparatus comprising:

a controller; and

receiver processing circuitry configured to;

receive channel state information reference signal (CSI-RS) configuration information including a CSI-RS configuration identifier (ID), a resource configuration, a subframe configuration, and quasi co-location (QCL) cell-specific reference signal (CRS) information,

receive a CSI-RS and a CRS corresponding to the CSI-RS configuration information based on the CSI-RS configuration information,

receive a control channel including demodulation reference signal (DMRS) information and QCL information, and

receive a data channel indicated by the control channel, based on at least one DMRS port corresponding to the DMRS information and at least one CSI-RS port corresponding to the QCL information,

wherein the QCL CRS information indicates the CRS corresponding to the CSI-RS configuration information that is quasi co-located with the CSI-RS corresponding to the CSI-RS configuration information, and

wherein the at least one DMRS port corresponding to the DMRS information and at least one CSI-RS port corresponding to the QCL information is quasi co-located.

11. The apparatus of claim 10, wherein the receiver processing circuitry is further configured to receive CSI-RS information associated with values of the QCL information.

12. The apparatus of claim 10, wherein:

the CRS corresponding to the CSI-RS configuration information that is quasi co-located with the CSI-RS corresponding to the CSI-RS configuration information means that large scale properties for the CRS can be inferred from large scale properties for the CSI-RS, and

the large scale properties for the CRS include at least one of a Doppler shift, a Doppler spread, an average delay, or a delay spread.

13. The apparatus of claim 10, wherein:

the receiver processing circuitry is further configured to receive QCL type information; and

the controller is configured to assume that all CRSs, CSI-RSs, and DMRSs may be assumed as quasi co-located when the QCL type information is a first type.

14. The apparatus of claim 10, wherein:

the receiver processing circuitry is further configured to receive QCL type information; and

the controller is configured to assume that the at least one DMRS port corresponding to the DMRS information and at least one CSI-RS port corresponding to the QCL information are quasi co-located when the QCL type information is a second type.