Reduced csi (channel state information)-rs (reference signal) density support for fd (full dimensional)-mimo (multiple input multiple output) systems

An apparatus configured to be employed in a UE (User Equipment), comprising:

• a memory interface;
• and
• processing circuitry configured to:
• process one or more configuration messages that comprise one or more configuration parameters for one or more CSI (Channel State Information)-RS (Reference Signal) APs (Antenna Ports) of a reduced density CSI-RS, wherein the one or more configuration parameters indicate a PRB (Physical Resource Block) decimation and a PRB offset;
• determine a set of REs (Resource Elements) for the one or more CSI-RS APs of the reduced density CSI-RS based on the one or more configuration parameters;
• measure the reduced density CSI-RS from the set of REs to determine one or more CSI parameters;
• and
• send the PRB decimation and the PRB offset to a memory via the memory interface.

An apparatus configured to be employed in a gNB (next Generation Node B), comprising:

• a memory interface;
• and
• processing circuitry configured to:
• generate one or more configuration messages that comprise one or more configuration parameters for one or more CSI (Channel State Information)-RS (Reference Signal) APs (Antenna Ports) of a reduced density CSI-RS, wherein the one or more configuration parameters indicate a PRB (Physical Resource Block) decimation and a PRB offset;
• determine a set of REs (Resource Elements) for the one or more CSI-RS APs of the reduced density CSI-RS based on the one or more configuration parameters;
• map the reduced density CSI-RS for the one or more CSI-RS APs to the determined set of REs;
• and
• send the PRB decimation and the PRB offset to a memory via the memory interface.

A non-transitory machine readable medium comprising instructions that, when executed, cause a User Equipment (UE) to:

• receive one or more configuration messages that comprise one or more configuration parameters for one or more CSI (Channel State Information)-RS (Reference Signal) APs (Antenna Ports) of a reduced density CSI-RS, wherein the one or more configuration parameters indicate a PRB (Physical Resource Block) decimation and a PRB offset;
• determine a set of REs (Resource Elements) for the one or more CSI-RS APs of the reduced density CSI-RS based on the one or more configuration parameters;
• receive the reduced density CSI-RS from the set of REs;
• and
• measure the reduced density CSI-RS to determine one or more CSI parameters.

A non-transitory machine readable medium comprising instructions that, when executed, cause a next Generation Node B (gNB) to:

• transmit one or more configuration messages that comprise one or more configuration parameters for one or more CSI (Channel State Information)-RS (Reference Signal) APs (Antenna Ports) of a reduced density CSI-RS, wherein the one or more configuration parameters indicate a PRB (Physical Resource Block) decimation and a PRB offset;
• determine a set of REs (Resource Elements) for the one or more CSI-RS APs of the reduced density CSI-RS based on the one or more configuration parameters;
• and
• transmit the reduced density CSI-RS for the one or more CSI-RS APs via the determined set of REs.