Sounding reference transmission

A wireless device for performing sounding reference signal (SRS) transmission, the wireless device comprising:

• a receiver for receiving 1) a radio resource control (RRC) message comprising an indication for one or more SRS resource sets to be configured and a precoding indicator and 2) downlink control information (DCI) indicating a selected one of the one or more SRS resource sets to use for a SRS transmission;
• and
• processing circuitry configured to cause the wireless device to perform a method comprising:
• determining whether the precoding indicator indicates non-codebook based precoding;
• as s result of determining that the precoding indicator indicates non-codebook based precoding, determining a precoder for the SRS transmission based on a measurement of a downlink (DL) reference signal and based on the selected SRS resource set and the precoding indicator;
• and
• transmitting the SRS based on the determination.

A method performed by a network node, the method comprising:

• sending to a wireless device a radio resource control (RRC) message comprising i) an indication for one or more sounding reference signal (SRS) resource sets to be configured and ii) a precoding indicator that causes the wireless device to determine a precoder for an uplink (UL) SRS transmission based on a downlink (DL) reference signal transmitted by the network node, wherein the precoding indicator indicates non-codebook based precoding;
• sending to the wireless device downlink control information (DCI) indicating a selected one of the one or more SRS resource sets to use for the UL SRS transmission;
• and
• receiving the UL SRS transmission.

A network node, the network node comprising:

• memory;
• and
• processing circuitry coupled to the memory, wherein
• the network node is configured to perform a method that comprises:
• sending to a wireless device a radio resource control (RRC) message comprising i) an indication for one or more sounding reference signal (SRS) resource sets to be configured and ii) a precoding indicator that causes the wireless device to determine a precoder for an uplink (UL) SRS transmission based on a downlink (DL) reference signal transmitted by the network node, wherein the precoding indicator indicates non-codebook based precoding;
• sending to the wireless device downlink control information (DCI) indicating a selected one of the one or more SRS resource sets to use for the UL SRS transmission, and
• the network node further comprises a receiver for receiving the UL SRS transmission.