METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING REFERENCE SIGNALS IN WIRELESS COMMUNICATION

• US 20170288743A1
• Filed: 03/28/2017
• Published: 10/05/2017
• Est. Priority Date: 03/31/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Nam, Young-Han, Ng, Boon Loong, Li, Yang, Ramakrishna, Sudhir, Rahman, Md. Saifur
• Granted Patent: US 11,038,557 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A base station includes a controller configured to configure an MRS resource set comprising a group of MRS resources, each MRS resource comprising a set of MRS antenna ports. If at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of QCL parameters, else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters, and else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters. The MRS is a CSI-RS for estimating a CSI and at least one of the first set and the second set of QCL parameters.

Claims

1. A base station comprising:

a controller configured to configure a measurement reference signal (MRS) resource set comprising a group of MRS resources, each MRS resource comprising a set of respective MRS antenna ports, wherein;

if at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of quasi co-located large scale channel parameters (QCL parameters);

else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters; and

else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters unless indicated otherwise;

a transceiver configured to transmit the MRS resource set to a user equipment,

wherein an MRS is a channel state information reference signal (CSI-RS) for estimating a CSI and at least one of the first set of QCL parameters and the second set of QCL parameters.

2. The base station of claim 1, wherein the first set of QCL parameters comprise a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay, and the second set of QCL parameters comprise a Doppler spread and a Doppler shift.

3. The base station of claim 1, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters,

wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the first set of QCL parameters,

wherein the UE-specific MRS is a UE-specific CSI RS for the second set of QCL parameters.

4. The base station of claim 1, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters,

wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the second set of QCL parameters,

wherein the UE-specific MRS is a UE-specific CSI-RS for estimating the first set of QCL parameters.

5. The base station of claim 1, wherein when the second set of QCL parameters is different for a different set of a UE-specific MRS, the second set of QCL parameters is dynamically changed according to a downlink control information (DCI) signaling.

6. The base station of claim 1, wherein the base station configures an MRS resource to the UE, the MRS resource comprising a number of antenna ports, an MRS pattern for an MRS and a set of QCL parameters.

7. A user equipment (UE) comprising:

a transceiver configured to receive a measurement reference signal (MRS) resource set comprising a group of MRS resources from a base station, each MRS resource comprising a set of respective MRS antenna ports, wherein;

if at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of quasi co-located large scale channel parameters (QCL parameters);

else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters; and

else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters unless indicated otherwise; and

a controller configured to be configured with the measurement reference signal (MRS) resource set,

wherein an MRS is a channel state information reference signal (CSI-RS) for estimating a CSI and at least one of the first set of QCL parameters and the second set of QCL parameters.

8. The UE of claim 7, wherein the first set of QCL parameters comprise a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay, and the second set of QCL parameters comprise a Doppler spread and a Doppler shift.

9. The UE of claim 7, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters,

wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the first set of QCL parameters,

wherein the UE-specific MRS is a UE-specific CSI RS for the second set of QCL parameters.

10. The UE of claim 7, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters,

wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the second set of QCL parameters,

wherein the UE-specific MRS is a UE-specific CSI-RS for estimating the first set of QCL parameters.

11. The UE of claim 7, wherein when the second set of QCL parameters is different for a different set of a UE-specific MRS, the second set of QCL parameters is dynamically changed according to a downlink control information (DCI) signaling.

12. The UE of claim 7, wherein the base station configures an MRS resource to the UE, the MRS resource comprising a number of antenna ports, an MRS pattern for an MRS and a set of QCL parameters.

13. A method for operating a base station, the method comprising:

configuring a measurement reference signal (MRS) resource set comprising a group of MRS resources, each MRS resource comprising a set of respective MRS antenna ports, wherein;

if at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of quasi co-located large scale channel parameters (QCL parameters);

else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters; and

else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters unless indicated otherwise; and

transmitting the MRS resource set to a user equipment,

wherein an MRS is a channel state information reference signal (CSI-RS) for estimating a CSI and at least one of the first set of QCL parameters and the second set of QCL parameters.

14. The method of claim 13, wherein the first set of QCL parameters comprise a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay, and the second set of QCL parameters comprise a Doppler spread and a Doppler shift.

15. The method of claim 13, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters,

wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the first set of QCL parameters,

wherein the UE-specific MRS is a UE-specific CSI RS for the second set of QCL parameters.

16. The method of claim 13, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters,

wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the second set of QCL parameters,

wherein the UE-specific MRS is a UE-specific CSI-RS for estimating the first set of QCL parameters.

17. The method of claim 13, wherein when the second set of QCL parameters is different for a different set of a UE-specific MRS, the second set of QCL parameters is dynamically changed according to a downlink control information (DCI) signaling.

18. The method of claim 13, wherein the base station configures an MRS resource to the UE, the MRS resource comprising a number of antenna ports, an MRS pattern for an MRS and a set of QCL parameters.

19. A base station comprising:

a transceiver configured to transmit Physical Uplink Shared Channel (PUSCH) transmission parameters to a user equipment (UE); and

a controller configured to configure the PUSCH transmission parameters including a cyclic shift, a orthogonal cover code (OCC) and comb offset parameters O<sup>(λ

)</sup>(0) and O<sup>(λ

)</sup>(1), wherein for up-to eight UE multi user (MU) multi-input multi-output (MIMO) with one layer per UE, the comb offset parameters O<sup>(λ

)</sup>(0) and O<sup>(λ

)</sup>(1) are determined according to a following table;

20. A user equipment (UE) comprising:

a transceiver configured to receive Physical Uplink Shared Channel (PUSCH) transmission parameters; and

a controller configured to generate a Demodulation reference signal (DMRS) sequence using uplink PUSCH transmission parameters, wherein the uplink PUSCH transmission parameters includes a cyclic shift, a orthogonal cover code (OCC) and comb offset parameters O<sup>(λ

)</sup>(0) and O<sup>(λ

)</sup>(1), wherein for up-to eight UE multi user (MU) multi-input multi-output with one layer per UE, the comb offset parameters O<sup>(λ

)</sup>(0) and O<sup>(λ

)</sup>(1) are determined according to a following table;