Efficient SRS resource indication methods

A wireless device operable in a wireless communication network to transmit an uplink transmission, the wireless device comprising:

• an antenna configured to send and receive wireless signals;
• and
• a transceiver connected to the antenna and to processing circuitry, and configured to condition signals communicated between the antenna and the processing circuitry, the processing circuitry being configured to carry out a method comprising:
• receiving signaling configuring the wireless device to use a plurality of SRS resource groups, wherein each group comprises a plurality of SRS resources and wherein none of the SRS resources can be selected for simultaneous use with another SRS resource belonging to the same SRS resource group;
• receiving an indication, in a physical layer downlink control channel, of the SRS resources to be used;
• determining, from the indication, a first and a second SRS resource group, wherein the first and second SRS resource groups are selected from the plurality of SRS resource groups;
• determining from the indication a first SRS resource that is selected only from the first SRS resource group;
• determining from the indication a second SRS resource that is selected only from the second SRS resource group;
• and
• transmitting simultaneously
• SRSs identified by the first and second SRS resources.

A method in a network node, of configuring reference signal transmission settings in a wireless device operable in a wireless communication network, the method comprising:

• transmitting signaling configuring the wireless device to use a plurality of SRS resource groups, wherein each group comprises a plurality of SRS resources and wherein none of the SRS resources can be selected for simultaneous use with another SRS resource belonging to the same SRS resource group;
• transmitting an indication, in a physical layer downlink control channel, of the SRS resources to be used, the indication including an indication of:
• a first and a second SRS resource group, wherein the first and second SRS resource groups are selected from the plurality of SRS resource groups,
• a first SRS resource that is selected only from the first SRS resource group, and
• a second SRS resource that is selected only from the second SRS resource group and is selected for simultaneous use with the first SRS resource;
• and
• receiving
• SRSs identified by the first and second SRS resources and transmitted simultaneously by the wireless device.

A network node for receiving an uplink transmission from a wireless device in a wireless communication network, the network node comprising:

• an antenna configured to send and receive wireless signals;
• and
• a transceiver connected to the antenna and to processing circuitry, and configured to condition signals communicated between the antenna and the processing circuitry, the processing circuitry being configured to carry out a method comprising:
• transmitting signaling configuring the wireless device to use a plurality of SRS resource groups, wherein each group comprises a plurality of SRS resources and wherein none of the SRS resources can be selected for simultaneous use with another SRS resource belonging to the same SRS resource group;
• transmitting an indication, in a physical layer downlink control channel, of the SRS resources to be used, the indication including an indication of:
• a first and a second SRS resource group, wherein the first and second SRS resource groups are selected from the plurality of SRS resource groups,
• a first SRS resource that is selected only from the first SRS resource group, and
• a second SRS resource that is selected only from the second SRS resource group and is selected for simultaneous use with the first SRS resource;
• receiving
• SRSs identified by the first and second SRS resources and transmitted simultaneously by the wireless device.