Network node, user equipment and methods therein to enable the UE to determine a precoder codebook

A method performed by a User Equipment (UE) of determining a precoder codebook in a wireless communication system, the method comprising:

• receiving, from a base station, values of precoder parameters enabling the UE to determine the precoder codebook, wherein the precoder parameters are associated with a plurality of antenna ports of the base station and wherein the precoder parameters specify a number of antenna ports in a first dimension and an oversampling factor in the first dimension and specify a number of antenna ports in a second dimension and an oversampling factor in the second dimension;
• and
• determining the precoder codebook based on the received values of the precoder parameters and a parameter-based codebook;
• wherein a precoder in the precoder codebook comprises a first precoder matrix assoicated with the first dimension, a second precoder matrix associated with the second dimension, and a frequency-selective precoder.

A base station for enabling a User Equipment (UE) to determine a precoder codebook in a wireless communication system, the base station comprising:

• a transceiver;
• a processor, operatively coupled to the transceiver;
• and
• a memory, operatively coupled to the processor and comprising instructions for execution by the processor, said instructions being configured to, upon execution by the processor, cause the base station to:
• transmit, to the UE, values of precoder parameters enabling the UE to determine the precoder codebook based on a parameter-based codebook wherein the precoder parameters are associated with a plurality of antenna ports of the base station and wherein the precoder parameters specify a number of antenna ports in a first dimension and an oversampling factor in the first dimension and specify a number of antenna ports in a second dimension and an oversampling factor in the second dimension;
• wherein a precoder in the precoder codebook comprises a first precoder matrix associated with the first dimension, a second precoder matrix associated with the second dimension, and a frequency-selective precoder.

A User Equipment (UE) for determining a precoder codebook in a wireless communication system, the UE comprising:

• a transceiver;
• a processor, operatively coupled to the transceiver;
• and
• a memory, operatively coupled to the processor and comprising instructions for execution by the processor, said instructions being configured to, upon execution by the processor, cause the UE to:
• receive, from a base station, values of precoder parameters enabling the UE to determine the precoder codebook, wherein the precoder parameters are associated with a plurality of antenna ports of the base station and wherein the precoder parameters specify a number of antenna ports in a first dimension and an oversampling factor in the first dimension and specify a number of antenna ports in a second dimension and an oversampling factor in the second dimension, and
• determine the precoder codebook based on the received values of the precoder parameters and a parameter-based codebook;
• wherein a precoder in the precoder codebook comprises a first precoder matrix associated with the first dimension, a second precoder matrix associated with the second dimension, and a frequency-selective precoder.