Beam Codebook Restriction Using Layer-Based Soft Amplitude Scaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively mitigating inter-cell interference through codebook subset restriction (CBSR) due to the use of hard amplitude restrictions that are too restrictive and do not account for varying numbers of data streams, leading to improper calculation of soft amplitude restrictions.
Innovation Solution
Implementing a CBSR mechanism that allows for soft amplitude restriction based on the number of layers associated with each beam, enabling dynamic attenuation of beams with a non-zero fraction to mitigate inter-cell interference, and supporting exclusive associations between beams and layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hard amplitude restrictions are used in CBSR, then inter-cell interference is reduced, but communication efficiency deteriorates due to excessive restrictiveness
Solution Approach 1:
The patent changes the amplitude restriction parameter from hard (binary) to soft (continuous), allowing dynamic adjustment of beam attenuation levels. This enables the system to balance interference mitigation with communication efficiency by applying proportional restrictions rather than absolute blockages.
Solution Approach 2:
The patent introduces dynamic amplitude restrictions that adapt based on the number of layers associated with each beam. The restriction strength varies continuously based on actual communication conditions, transforming the static hard restriction into a dynamic soft restriction mechanism.
2Device complexity
If uniform amplitude restrictions are applied to all beams, then implementation is simplified, but performance deteriorates due to lack of differentiation based on layer associations
Solution Approach 1:
The patent applies different amplitude restriction levels to different beams based on their specific layer associations. Each beam receives a customized restriction level proportional to its layer count, creating local differentiation in restriction strength rather than uniform treatment.
Solution Approach 2:
The patent segments the beamset into different groups based on their layer associations, applying distinct amplitude restrictions to each segment. This segmentation allows tailored restriction strategies for beams with different numbers of layers while maintaining manageable implementation through systematic grouping.
3Device complexity
If soft amplitude restrictions are calculated without considering layer numbers, then calculation is simplified, but interference mitigation effectiveness deteriorates
Solution Approach 1:
The patent modifies the amplitude restriction calculation by incorporating the number of layers as a key parameter. The restriction level is now proportional to the layer count, transforming the calculation into a more comprehensive metric that reflects actual communication burden and interference potential.
Solution Approach 2:
The patent implements a feedback mechanism where the number of layers associated with each beam is used to adjust the amplitude restriction level. This feedback loop ensures that beams with more layers (which cause more interference) receive proportionally stronger restrictions, improving overall mitigation effectiveness.
Data Source
AI summary
Various aspects of the present disclosure relate to codebook subset restriction (CBSR) based on number of layers associated with a beam. A user equipment (UE) receives a channel state information (CSI) report setting that comprises an indication of a codebook subset restriction (CBSR). An initial amplitude value of a first restricted beam of a set of restricted beams is based at least in part on the CBSR. The UE adjusts the initial amplitude value of the first restricted beam based at least in part on a number of layers associated with the first restricted beam.