US 11,152,980 B2 · Adaptive digital precoder codebook configurations for mmWave communication based on hybrid beamforming

Abstract

Base stations and user terminals may adaptively configure a digital precoder codebook for mmWave-based hybrid beamforming, such as by determining at least one analog beamformer and combiner, determining at the user terminal a lowest codebook resolution of digital precoding that can be used to achieve at least one performance parameter, and communicating to the base station the determined lowest codebook resolution of digital precoding. The adjustment of digital precoder codebook resolution, on top of analog beamforming, across different radio resources (e.g. time/frequency) may optimize feedback efficiency for a user terminal. In some cases, the user terminal may also receive from a base station an assistance parameter relating to an achievable performance gain using digital precoding. The user terminal may use the received assistance parameter in determining the digital precoder codebook resolution.

Claims20

Dependent claims

A method for a mmWave user terminal capable of analog beamforming and digital beamforming, the method comprising:

receiving, from an access node, a downlink reference signal using an analog beamforming setting;
measuring, using the received downlink reference signal, an effective channel based on the analog beamforming setting;
receiving, from the access node, an assistance parameter indicating a target performance threshold;
determining, based on the measured effective channel, a minimum digital precoder codebook resolution capable of achieving the performance threshold;
and
sending the determined minimum digital precoder codebook resolution to the access node.

3 more elements

A user terminal comprising a processor and a non-transitory computer-readable storage medium storing instructions operative, when executed on the processor, to perform functions including:

receiving, from an access node, a downlink reference signal using an analog beamforming setting;
measuring, using the received downlink reference signal, an effective channel based on the analog beamforming setting;
receiving, from the access node, an assistance parameter indicating a target performance threshold;
determining, based on the measured effective channel, a minimum digital precoder codebook resolution capable of achieving the performance threshold;
and
sending the determined minimum digital precoder codebook resolution to the access node.

3 more elements

Dependencies are inferred from the claim text.

Adaptive digital precoder codebook configurations for mmWave communication based on hybrid beamforming

Life of this patent

Adaptive digital precoder codebook configurations for mmWave communication based on hybrid beamforming

Life of this patent

Abstract

Claims20