Signaling of csi-rs configuration for ultra large antenna array

A User Equipment (UE), adapted to:

• receive, from a network node, a first indication of starting resource elements (REs) for a first subset of code division multiplexing (CDM) groups in a first set of time-frequency resource units;
• receive, from the network node, a second indication of starting REs for a second subset of CDM groups in a second set of time-frequency resource units;
• receive a first subset of non-zero power (NZP) channel state information reference signal (CSI-RS) ports in the first subset of CDM groups, in accordance with the first indication of the starting REs for the first subset of CDM groups in the first set of time-frequency resource units;
• and
• receive a second subset of NZP CSI-RS ports in the second subset of CDM groups, in accordance with the second indication of the starting REs for the second subset of CDM groups in the second set of time-frequency resource units.

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

• sending, to a User Equipment (UE), a first indication of starting resource elements (REs) for a first subset of code division multiplexing (CDM) groups in a first set of time-frequency resource units;
• sending, to the UE, a second indication of starting REs for a second subset of CDM groups in a second set of time-frequency resource units;
• transmitting, to the UE, a first subset of non-zero power (NZP) channel state information reference signal (CSI-RS) ports in the first subset of CDM groups, in accordance with the first indication of the starting REs for the first subset of CDM groups in the first set of time-frequency resource units;
• and
• transmitting, to the UE, a second subset of NZP CSI-RS ports in the second subset of CDM groups, in accordance with the second indication of the starting REs for the second subset of CDM groups in the second set of time-frequency resource units.

A network node adapted to:

• send, to a User Equipment (UE), a first indication of starting resource elements (REs) for a first subset of code division multiplexing (CDM) groups in a first set of time-frequency resource units;
• send, to the UE, a second indication of starting REs for a second subset of CDM groups in a second set of time-frequency resource units;
• transmit, to the UE a first subset of non-zero power (NZP) channel state information reference signal (CSI-RS) ports in the first subset of CDM groups, in accordance with the first indication of the starting REs for the first subset of CDM groups in the first set of time-frequency resource units;
• and
• transmit, to the UE, a second subset of NZP CSI-RS ports in the second subset of CDM groups, in accordance with the second indication of the starting REs for the second subset of CDM groups in the second set of time-frequency resource units.