Codebook Subset Restriction for Millimeter-Wave Beamforming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in millimeter-wave systems, the process of beamforming for efficient signal transmission is resource-intensive and delays measurement due to the need for the UE to evaluate multiple beams, leading to battery life impact and inefficiency.
Innovation Solution
Implementing codebook subset restriction (CSR) techniques that allow UEs to receive restricted beam sets from network entities, enabling them to provide precoding matrix indicator (PMI) feedback efficiently, thereby reducing the complexity and resource consumption of beamforming measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE evaluates multiple beams for beamforming, then the beamforming transmission efficiency is improved, but the measurement delay increases and battery life is impacted
Solution Approach 1:
The patent extracts and removes certain beams from the complete codebook to form a restricted codebook. By taking out specific beams that are not needed for the current transmission rank, the UE only needs to evaluate the remaining subset of beams, thereby reducing measurement delay and battery consumption while maintaining sufficient beamforming performance for the given rank.
Solution Approach 2:
The patent applies partial action by having the UE evaluate only a subset of beams rather than the complete codebook. The restricted codebook contains only the necessary beams for the current rank, so the UE performs partial evaluation instead of exhaustive evaluation, reducing complexity and measurement time while achieving adequate beamforming efficiency.
2Productivity
If the UE evaluates multiple beams for beamforming, then the beamforming transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent extracts unnecessary beams from the complete codebook based on the transmission rank, creating a restricted codebook with fewer beams. This extraction reduces the number of beam evaluations the UE must perform, thereby reducing device complexity and computational burden while preserving the essential beamforming capability needed for the current transmission rank.
Solution Approach 2:
The patent implements partial evaluation by restricting the codebook to only those beams necessary for the current rank. The UE performs beam evaluation on a partial set rather than the complete codebook, reducing the complexity of beamforming measurements while maintaining sufficient transmission efficiency for the given rank.
3Measurement precision
If the UE uses a complete codebook for PMI feedback, then the beamforming accuracy is improved, but the resource consumption increases
Solution Approach 1:
The patent extracts and removes beams that are not relevant for the current transmission rank from the complete codebook. This creates a restricted codebook that contains only the necessary beams, reducing the resource consumption for beam evaluation and PMI feedback while maintaining beamforming accuracy sufficient for the given rank through the network entity's control.
Solution Approach 2:
The patent applies partial evaluation by having the UE process only a subset of beams in the restricted codebook rather than the complete codebook. This partial action reduces computational resources and energy consumption for beamforming measurements and PMI feedback while the network entity ensures adequate beamforming accuracy by appropriately configuring the restricted codebook.
Data Source
AI summary
Aspects of the present disclosure relate to techniques for codebook subset restriction (CSR). In some cases, a user equipment (UE) receives, from a network entity, codebook subset restriction (CSR) information. The UE determines, based on the CSR information, a restricted beam set for a plurality of antenna panels, determines precoding matrix indicator (PMI) feedback for the antenna panels subject to restricted beam set, and provides the PMI feedback to the network entity.