Methods for reporting the number of non-zero coefficients

A method performed by a network node for receiving Channel State Information (CSI) the method comprising:

• configuring a User Equipment (UE) with a configuration for a first number NTRP>1 Non-Zero Power (NZP) CSI Reference Signal (CSI-RS) resources;
• configuring the UE with one or more CSI parameters including configuration of a second number NL parameter combinations, wherein each of the NL parameter combinations is composed of a set {L1, L2, . . . , LNTRP}, where Ln represents a number of spatial domain (SD) basis vectors corresponding to the nth NZP CSI-RS resource;
• determining a payload size of a total number Knz of non-zero coefficients to be reported as part of the CSI using a first parameter combination among the NL parameter combinations;
• and
• receiving, from the UE CSI based on measurements performed on NTRP CSI-RS resources.

A User Equipment (UE) comprising processing circuitry and memory, the memory comprising instructions to cause the UE to:

• receive a configuration for NTRP>1 Non-Zero Power CSI Reference Signal (NZP CSI-RS) resources;
• receive one or more CSI parameters including configuration of NL parameter combinations, wherein each of the NL parameter combinations is composed of a set {L1, L2, . . . , LNTRP}, where Ln represents a number spatial domain basis vectors corresponding to the nth NZP CSI-RS resource;
• determine a payload size of a number of Channel State Information (CSI) non-zero coefficients to be reported as part of the CSI using a first parameter combination among the NL parameter combinations;
• perform measurements on the NTRP>1 NZP CSI-RS resources;
• and
• report CSI based on the performed measurements.

A network node comprising processing circuitry and memory, the memory comprising instructions to cause the network node to:

• configure the UE with a configuration for the NTRP>1 CSI Reference Signal (CSI-RS) resources;
• configure the UE with one or more CSI parameters including configuration of NL parameter combinations, wherein each of the NL parameter combinations is composed of a set {L1, L2, . . . , LNTRP}, where Ln represents a number spatial domain basis vectors corresponding to the nth Non-Zero Power CSI Reference Signal (NZP CSI-RS) resource;
• determine a payload size of a number of Channel State Information (CSI) non-zero coefficients to be reported as part of the CSI using a first parameter combination among the NL parameter combinations;
• and
• receive, from a User Equipment (UE) CSI based on measurements performed on NTRP CSI Reference Signal (CSI-RS) resources.