Hybrid-SRS combination signaling

A wireless device operable to perform uplink transmission in a wireless communication network, the wireless device comprising a plurality of antenna ports and processing circuitry operable to:

• determine one or more subsets of the plurality of antenna ports, wherein each subset of antenna ports comprises antenna ports that are coherently combinable to form a precoding of a transmission layer for transmitting from the subset of antenna ports, and wherein each antenna port is associated with one or more baseband ports and whether a first antenna port is coherently combined with a second antenna port is based on physical properties of the baseband ports associated with the first antenna port and the baseband ports associated with the second antenna port;
• communicate an indication of the one or more subsets to a network node, wherein the processing circuitry is operable to communicate the indication of the one or more subsets by sending, to the network node, a radio resource control (RRC) message that includes the indication;
• receive, from the network node, an instruction of a precoding to use for an uplink transmission, the instruction based on the indicated one or more subsets;
• precode an uplink transmission based on the received instruction;
• and
• transmit the uplink transmission to the network node.

A method in a network node operable to receive an uplink transmission in a wireless communication network from a wireless device comprising a plurality of antenna ports, the method comprising:

• receiving, from the wireless device, an indication of one or more subsets of the plurality of antenna ports, wherein each subset of antenna ports comprises antenna ports that are coherently combinable to form a precoding of a transmission layer for transmitting from the subset of antenna ports, and wherein each antenna port is associated with one or more baseband ports and whether a first antenna port is coherently combined with a second antenna port is based on physical properties of the baseband ports associated with the first antenna port and the baseband ports associated with the second antenna port, wherein receiving the indication comprises receiving a radio resource control (RRC) message;
• determining a precoding for the wireless device to use for an uplink transmission based on the received indication;
• and
• sending an instruction to use the determined precoding to the wireless device.

A network node operable to receive an uplink transmission in a wireless communication network from a wireless device comprising a plurality of antenna ports, the network node comprising processing circuitry operable to:

• receive, from the wireless device, an indication of one or more subsets of the plurality of antenna ports, wherein each subset of antenna ports comprises antenna ports that are coherently combinable to form a precoding of a transmission layer for transmitting from the subset of antenna ports, and wherein each antenna port is associated with one or more baseband ports and whether a first antenna port is coherently combined with a second antenna port is based on physical properties of the baseband ports associated with the first antenna port and the baseband ports associated with the second antenna port, wherein the processing circuitry is operable to receive the indication by receiving a radio resource control (RRC) message;
• determine a precoding for the wireless device to use for an uplink transmission based on the received indication;
• and
• send an instruction to use the determined precoding to the wireless device.