Precoding Coefficient Quantization for Wireless Codebook Subset Restriction
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Solution Overview
Problem
Current wireless communication technologies face challenges in efficiently managing Codebook Subset Restriction (CBSR) for Type-2 Discrete Fourier Transform (DFT) Codebooks, particularly in ensuring compliance with maximum allowed gain constraints and inter-cell interference control in wireless wide area networks.
Innovation Solution
The method involves receiving a CBSR configuration from a network, determining precoder coefficients for selected beams, and transmitting a CSI report that includes indicators of restricted and unrestricted beams, with quantized coefficients satisfying specific constraints to ensure compliance with maximum allowed gain and interference control, using a combination of amplitude restrictions and beam grouping techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If DFT-based compression is applied to Type II codebooks, then overhead is reduced, but complexity of managing Codebook Subset Restriction increases
Solution Approach 1:
The codebook is divided into multiple subsets, each corresponding to different beam directions. By segmenting the codebook into restricted and unrestricted subsets, the system can reduce overhead through compression while maintaining manageable complexity through structured organization of beam groups and their associated restriction indicators.
2Object-generated harmful factors
If Codebook Subset Restriction is enforced to control inter-cell interference, then interference is reduced, but beam selection flexibility is limited
Solution Approach 1:
The CBSR configuration is made dynamic and configurable through higher-layer signaling, allowing the network to adapt restriction levels based on interference conditions. The system can dynamically adjust which beams are restricted and to what extent, balancing interference control with beam selection flexibility through configurable restriction indicators and scalable codebook structures.
3Object-generated harmful factors
If maximum allowed gain constraints are applied to restricted beams, then interference control is improved, but precoder design complexity increases
Solution Approach 1:
The system changes parameters such as maximum allowed gain values and restriction levels through higher-layer signaling. By adjusting these parameters dynamically, the network can control interference while managing precoder design complexity through standardized constraint frameworks and configurable parameter sets that simplify implementation.
Data Source
AI summary
A transceiver can transmit a codebook subset restriction configuration including a set of restricted beams. A channel state information report including a plurality of sets of quantized coefficients based on the codebook subset restriction configuration can be received. A set of quantized weights can be based on a least a Fourier transform of a set of quantized coefficients of the particular restricted beam. The plurality of sets of quantized coefficients can be based on quantized weights of the particular restricted beam satisfying a constraint. The plurality of sets of quantized coefficients can be further based on a set of coefficients quantized to determine the plurality of sets of quantized coefficients. The set of coefficients can be generated by transforming a set of beam weights from a frequency domain to a time domain, where the beam weights correspond to a transmitted beam.