Precoder Codebook Determination for Wireless UE
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Solution Overview
Problem
Existing wireless communication systems face significant overhead in precoder matrix indicator (PMI) reporting, particularly on payload-limited feedback channels like PUCCH, due to the need for separate codebooks for each antenna array configuration, leading to inefficiencies in channel state information feedback.
Innovation Solution
A method where a base station transmits precoder parameters associated with multiple antenna ports, allowing the User Equipment (UE) to determine a precoder codebook by combining precoder matrices using a Kronecker product structure, reducing the need for separate codebooks and enabling flexible frequency/time granularity in PMI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate codebooks are maintained for each antenna array configuration, then the system supports multiple antenna configurations, but the signaling overhead increases significantly
Solution Approach 1:
The patent implements a universal codebook structure that can serve multiple antenna array configurations through parameterization. By defining the codebook with configurable parameters (number of antenna ports, beams per dimension, oversampling factors), a single codebook can adapt to different antenna configurations without requiring separate dedicated codebooks for each configuration, thus reducing signaling overhead while maintaining versatility
Solution Approach 2:
The codebook is designed with adjustable parameters including the number of antenna ports NT, beams per dimension Mb, and oversampling factors Qh and Qv. These parameters can be modified based on the specific antenna configuration being used, allowing the same codebook structure to efficiently support multiple configurations by simply changing its parameters rather than maintaining separate codebooks
2Measurement precision
If the codebook is tailored for each specific antenna array configuration, then the precision of precoder matching improves, but the device complexity increases
Solution Approach 1:
The parameterized codebook structure serves as a universal solution that eliminates the need for separate codebook management for different antenna configurations. The base station and UE both use the same codebook generation rules with configured parameters, simplifying the overall system complexity while maintaining precise precoder matching for each specific configuration through appropriate parameter selection
3Measurement precision
If frequent PMI reporting is performed to maintain feedback accuracy, then the channel state information precision improves, but the payload overhead on feedback channels increases
Solution Approach 1:
The codebook parameters including the number of beams Mb and oversampling factors Qh and Qv can be configured based on channel conditions and feedback capabilities. This allows the system to adapt the precision of channel state information representation to match the available feedback resources, maintaining accuracy when possible while reducing overhead when payload limits are reached
Data Source
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AI summary
A method performed by a base station of enabling a User Equipment, UE, to determine a precoder codebook in a wireless communication system is provided. The base station transmits (303) to the LTE, information regarding precoder parameters enabling the LTE to determine the precoder codebook. The precoder parameters are associated with a plurality of antenna ports of the base station. The precoder parameters relate to a first dimension and a second dimension of the precoder codebook. The plurality of antenna ports comprises a number NT of antenna ports that is a function of a number Nh of antenna ports in the first dimension, and a number Nv of antenna ports in the second dimension.