Transmission of reference signals in a communication system

Patent metadata

Field	Value
Publication number	US-2017366377-A1
Application number	US-201715621705-A
Country	US
Kind code	A1
Filing date	Jun 13, 2017
Priority date	Jun 16, 2016
Publication date	Dec 21, 2017
Grant date	—

Abstract

A method for a user equipment (UE) to transmit a channel state information (CSI) report. The method comprises receiving configuration information for a location of a CSI report trigger field in a downlink control information (DCI) format that includes multiple CSI report trigger fields and receiving the DCI format. The method further comprises determining whether or not a value for the CSI report trigger field indicates a transmission of a CSI report and transmitting a physical uplink control channel (PUCCH) that includes the CSI report when the value indicates a transmission of the CSI report.

First claim

What is claimed is:

1 . A user equipment (UE) comprising:
a transceiver configured to:
receive configuration information for a location of a channel state information (CSI) report trigger field in a downlink control information (DCI) format that includes multiple CSI report trigger fields; and
receive the DCI format; and
a controller configured to determine whether or not a value for the CSI report trigger field indicates a transmission of a CSI report, wherein the transceiver is further configured to transmit a physical uplink control channel (PUCCH) that includes the CSI report when the value indicates a transmission of the CSI report.

2 . The UE of claim 1 , wherein the transceiver is further configured to receive configuration information for a PUCCH resource field, a resource for the PUCCH transmission being determined based on a value of the PUCCH resource field and a number of values of CSI report trigger fields, with respective locations prior to the location, that indicate transmissions of respective CSI reports.

3 . The UE of claim 1 , wherein:
the DCI format includes a PUCCH resource field; and a resource for the PUCCH transmission is determined based on a value of the PUCCH resource field and a number of values of CSI report trigger fields, with respective locations prior to the location, that indicate transmissions of respective CSI reports.

4 . The UE of claim 1 , wherein:
the DCI format includes a transmission power control (TPC) command field; and a PUCCH transmission power is determined according to a value of the TPC command field.

5 . The UE of claim 1 , wherein:
the DCI format indicates a reception of a channel state information reference signal (CSI-RS); and the CSI report is determined based on the CSI-RS.

6 . The UE of claim 1 , wherein:
the PUCCH transmission includes a transmission of a demodulation reference signal (DMRS); and a DMRS structure is determined based on a coding rate of the CSI report.

7 . The UE of claim 1 , wherein:
the PUCCH transmission is performed over a number of slots and includes a transmission of a demodulation reference signal (DMRS) over a number of sub-carriers; and a ratio of the number of sub-carriers over the number of slots is smaller when the number of slots is larger than one than when the number of slots is one.

8 . A base station comprising:
a transceiver configured to:
transmit configuration information for a location of a channel state information (CSI) report trigger field in a downlink control information (DCI) format that includes multiple CSI report trigger fields, and the DCI format; and
receive a physical uplink control channel (PUCCH) that includes a CSI report when a value for the CSI report trigger field indicates a transmission of the CSI report.

9 . The base station of claim 8 , wherein the transceiver is further configured to transmit configuration information for a PUCCH resource field, a resource for the PUCCH reception being determined based on a value of the PUCCH resource field and a number of values of CSI report trigger fields, with respective locations prior to the location, that indicate receptions of respective CSI reports.

10 . The base station of claim 8 , wherein the DCI format includes a transmission power control (TPC) command field.

11 . The base station of claim 8 , wherein the DCI format indicates a transmission of a channel state information reference signal (CSI-RS).

12 . The base station of claim 8 , wherein:
the PUCCH reception includes a reception of a demodulation reference signal (DMRS); and a DMRS structure is determined based on a coding rate of the CSI report.

13 . The base station of claim 8 , wherein:
the PUCCH reception includes a reception of a first demodulation reference signal (DMRS) and a second DMRS that is frequency division multiplexed with the first DMRS over a common bandwidth on a same reception symbol; and wherein the transceiver is further configured to demodulate, using the second DMRS, a signal received on same sub-carriers as the CSI report.

14 . A method for a user equipment (UE) to transmit a CSI report, the method comprising:
receiving configuration information for a location of a channel state information (CSI) report trigger field in a downlink control information (DCI) format that includes multiple CSI report trigger fields; receiving the DCI format; determining whether or not a value for the CSI report trigger field indicates a transmission of a CSI report; and transmitting a physical uplink control channel (PUCCH) that includes the CSI report when the value indicates a transmission of the CSI report.

15 . The method of claim 14 , further comprising receiving configuration information for a PUCCH resource field, a resource for the PUCCH transmission being determined based on a value of the PUCCH resource field and a number of values of CSI report trigger fields, with respective locations prior to the location, that indicate transmissions of respective CSI reports.

16 . The method of claim 14 , wherein:
the DCI format includes a PUCCH resource field; and a resource for the PUCCH transmission is determined based on a value of the PUCCH resource field and a number of values of CSI report trigger fields, with respective locations prior to the location, that indicate transmissions of respective CSI reports.

17 . The method of claim 14 , wherein:
the DCI format includes a transmission power control (TPC) command field; and a PUCCH transmission power is determined according to a value of the TPC command field.

18 . The method of claim 14 , wherein:
the DCI format indicates a reception of a channel state information reference signal (CSI-RS); and the CSI report is determined based on the CSI-RS.

19 . The method of claim 14 , wherein:
the PUCCH transmission includes a transmission of a demodulation reference signal (DMRS); and a DMRS structure is determined based on a coding rate of the CSI report.

20 . The method of claim 14 , wherein:
the PUCCH transmission is performed over a number of slots and includes a transmission of a demodulation reference signal (DMRS) over a number of sub-carriers; and a ratio of the number of sub-carriers over the number of slots is smaller when the number of slots is larger than one than when the number of slots is one.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Papasakellariou Aris

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L5/0092

  Indication of how the channel is divided · CPC title

• H04W24/00

  Supervisory, monitoring or testing arrangements · CPC title