Hybrid hierarchical parameter tracking for csi estimation

A method of a base station (BS), the method comprising:

• receiving uplink signals comprising a channel state information (CSI) report or a sounding reference signal (SRS);
• performing a channel parameter tracking operation to determine channel parameters that change less than a first threshold amount based on the received uplink signals;
• performing a channel parameter prediction operation to determine the channel parameters that change greater than a second threshold amount on an output of the channel parameter tracking operation;
• and
• performing a channel prediction operation for downlink channels based on an output of the channel parameter tracking operation and the channel parameter prediction operation.

A non-transitory computer-readable medium comprising program code, that when executed by at least one processor, causes a base station (BS) to:

• receive uplink signals comprising a channel state information (CSI) report or a sounding reference signal (SRS);
• perform a channel parameter tracking operation to determine channel parameters that change less than a first threshold amount based on the received uplink signals;
• perform a channel parameter prediction operation to determine the channel parameters that change greater than a second threshold amount on an output of the channel parameter tracking operation;
• and
• perform a channel prediction operation for downlink channels based on an output of the channel parameter tracking operation and the channel parameter prediction operation.