CSI report with time domain channel information

A base station configured for wireless communication, comprising:

• a transceiver;
• a memory;
• and
• a processor coupled to the transceiver and the memory, wherein the processor and the memory are configured to:
• transmit a plurality of reference signals to a user equipment (UE), each of the plurality of reference signals being associated with a different time resource of a plurality of time resources;
• receive a channel state information (CSI) report from the UE, the CSI report comprising time domain channel information based on a plurality of CSI values obtained based on the plurality of reference signals, wherein the time domain channel information comprises compressed channel information based on the plurality of CSI values, and wherein the compressed channel information comprises a main quantized phase coefficient, quantized differential phase coefficients, and at least one long-term amplitude parameter based on a number of CSI values including the plurality of CSI values and additional CSI values obtained prior to the plurality of CSI values, wherein the long-term amplitude parameter includes an average of the amplitudes of the number of CSI values;
• and
• reconstruct the plurality of CSI values based on the compressed channel information.

A method for wireless communication at a user equipment (UE), the method comprising:

• receiving a plurality of reference signals, each associated with a different time resource of a plurality of time resources;
• transmitting a channel state information (CSI) report comprising time domain channel information based on a plurality of CSI values obtained based on the plurality of reference signals, wherein the time domain channel information comprises compressed channel information based on the plurality of CSI values;
• determining at least one long-term amplitude parameter from a number of CSI values including the plurality of CSI values and additional CSI values obtained prior to the plurality of CSI values, wherein the time domain channel information further comprises the at least one long-term amplitude parameter, wherein the long-term amplitude parameter includes an average of the amplitudes of the number of CSI values;
• applying a time domain transform to the plurality of CSI values to produce a plurality of transform values;
• selecting a plurality of taps from the plurality of transform values to produce a plurality of coefficients, wherein the plurality of coefficients comprises a main phase coefficient and a plurality of differential phase coefficients with respect to the main phase coefficient;
• and
• quantizing the main phase coefficient using a first quantization type to produce a main quantized phase coefficient and quantize the plurality of differential phase coefficients using a second quantization type to produce a plurality of quantized differential phase coefficients, wherein the compressed channel information comprises the main quantized phase coefficient and the quantized differential phase coefficients, wherein the first quantization type is different from the second quantization type and wherein the compressed channel information comprises respective indices of each of the plurality of taps.

A method for wireless communication at a base station, the method comprising:

• transmitting a plurality of reference signals to a user equipment (UE), each of the plurality of reference signals being associated with a different time resource of a plurality of time resources;
• receiving a channel state information (CSI) report from the UE, the CSI report comprising time domain channel information based on a plurality of CSI values obtained based on the plurality of reference signals, wherein the time domain channel information comprises compressed channel information based on the plurality of CSI values, and wherein the compressed channel information comprises a main quantized phase coefficient, quantized differential phase coefficients, and at least one long-term amplitude parameter based on a number of CSI values including the plurality of CSI values and additional CSI values obtained prior to the plurality of CSI values, wherein the long-term amplitude parameter includes an average of the amplitudes of the number of CSI values;
• and
• reconstructing the plurality of CSI values based on the compressed channel information.