Methods and Apparatuses for Codebook Restriction for Type-II Feedback Reporting and Higher Layer Configuration and Reporting for Linear Combination Codebook in a Wireless Communications Network

A method, comprising:

• transmitting a radio signal to a device, wherein the radio signal comprises at least one DownLink reference signal;
• receiving a report, wherein the report comprises at least one of a Channel State Information feedback, a Precoder Matrix Indicator, and a Precoder Matrix Indicator Rank Indicator,
• wherein the at least one of the Channel State Information feedback, the Precoder Matrix Indicator, and the Precoder Matrix Indicator Rank is arranged indicate a precoding matrix for configured antenna ports,
• wherein the precoding matrix is based on a first codebook and on a second codebook, and on a plurality of combination coefficients,
• wherein the first codebook comprises at least one transmit-side spatial beam component/vector of the precoding matrix,
• wherein the second codebook comprises at least one delay component/vector of the precoding matrix;
• and
• configuring the device with a higher layer configuration, wherein the higher layer configuration comprises an indication of a portion of beam vectors from the first codebook and a maximum allowable average amplitude for a first beam vector,
• wherein the maximum allowable average amplitude for the first beam vector is arranged to restrict an average amplitude of the combination coefficients associated with the first beam vector,
• wherein the report indicates at least selected delay vectors and spatial beam vectors associated with non-zero combination coefficients of the plurality of combination coefficients.

A device, comprising:

• a processor circuit;
• and
• a memory circuit,
• wherein the memory circuit comprises instructions executable by the processor circuit,
• wherein the processor circuit is arranged to process a radio signal,
• wherein the radio signal is received by the device,
• wherein the radio signal comprises at least one DownLink reference signal,
• wherein the processor circuit is arranged to calculate a precoding matrix for a plurality of antenna ports,
• wherein the precoding matrix is based on a first codebook, and on a second codebook, and on a plurality of combination coefficients,
• wherein the first codebook comprises at least one transmit-side spatial beam component/vector of the precoding matrix,
• wherein the second codebook comprises at least one delay component/vector of the precoding matrix,
• wherein the processor circuit is arranged to receive a higher layer configuration,
• wherein the higher layer configuration comprises an indication of a portion of beam vectors from the first codebook and a maximum allowable average amplitude for a first beam vector,
• wherein the maximum allowable average amplitude for the first beam vector is arranged to restrict an average amplitude of the combination coefficients associated with the first beam vector,
• wherein the processor circuit is arranged to report at least one of a Channel State Information feedback, a Precoder Matrix Indicator, and a Precoder Matrix Indicator Rank Indicator,
• wherein the at least one of the Channel State Information feedback, the Precoder Matrix Indicator, and the Precoder Matrix Indicator Rank is arranged to indicate the precoding matrix for configured antenna ports,
• wherein the report comprises a bitmap,
• wherein the bitmap is arranged to indicate at least selected delay vectors and spatial beam vectors,
• wherein the selected delay vectors and the spatial beam vectors are associated with non-zero combination coefficients of the plurality of combination coefficients.

A device, comprising:

• a processor circuit, and
• a memory circuit,
• wherein the memory circuit comprises instructions executable by the processor circuit,
• wherein the processor circuit is arranged to cause the device transmit a radio signal,
• wherein the radio signal comprises at least one DownLink reference signal;
• wherein the processor circuit is arranged to receive a report,
• wherein the report comprises at least one of a Channel State Information feedback, a Precoder Matrix Indicator, and a Precoder Matrix Indicator Rank Indicator,
• wherein the at least one of the Channel State Information feedback, the Precoder Matrix Indicator, and the Precoder Matrix Indicator Rank is arranged to indicate a precoding matrix for configured antenna ports,
• wherein the precoding matrix is based on a first codebook, and on a second codebook, and on a plurality of combination coefficients,
• wherein the first codebook comprises at least one transmit-side spatial beam component/vector of the precoding matrix,
• wherein the second codebook comprises at least one delay component/vector of the precoding matrix,
• wherein the processor circuit arranges a higher layer configuration,
• wherein the higher layer configuration comprises a portion of beam vectors from the first codebook and a maximum allowable average amplitude for a first beam vector,
• wherein the maximum allowable average amplitude per beam vector is arranged to restrict an average amplitude of the plurality of combination coefficients associated with the first beam vector,
• wherein the report indicates at least selected delay vectors and spatial beam vectors,
• wherein the selected delay vectors and the spatial beam vectors are associated with non-zero combination coefficients of the plurality of combination coefficients.