Hierarchical Precoder Design for V2V Beam Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently designing a precoder for vehicle-to-vehicle communication, particularly in densely populated vehicle environments, where beam direction and resolution are critical for reducing interference and ensuring high-quality service.
Innovation Solution
A method for designing a hierarchical structure precoder, where user equipment (UE) receives group information based on beam direction, feeds back preference information, and designs a precoder comprising a first and second precoder, with the first precoder handling broad beams and the second precoder handling finer beams, using analog, digital, or hybrid beamforming techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-stage precoder is used in vehicle-to-vehicle communication, then the device complexity is low, but the beam resolution and direction control are insufficient leading to high interference in dense vehicular environments
Solution Approach 1:
The precoder is segmented into multiple hierarchical stages (first precoder, second precoder, third precoder) where each stage performs a specific function: the first precoder handles broad beamforming, the second precoder refines beam direction, and the third precoder provides fine-grained beam resolution. This segmentation allows the system to achieve high beam resolution without requiring a single complex precoder, thereby resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent introduces a hierarchical dimension to the precoder structure, organizing precoding operations across multiple levels or dimensions. Instead of a single flat precoder, the system uses a multi-dimensional hierarchical structure where each level operates at a different resolution, enabling the system to achieve high precision in beam direction control while keeping each individual precoder stage relatively simple.
2Reliability
If more feedback information is transmitted to improve channel state accuracy, then the communication quality improves, but the feedback payload increases leading to higher overhead
Solution Approach 1:
The feedback information is segmented and organized hierarchically to match the hierarchical precoder structure. Instead of transmitting a single large precoder matrix, the system divides feedback into multiple components corresponding to different precoder stages, allowing selective feedback of only the most critical information at each level, thereby reducing overall feedback payload while maintaining channel state accuracy.
Solution Approach 2:
The patent extracts and feeds back only the essential parameters needed for each precoder stage rather than transmitting complete precoder matrices. By taking out only the critical components (such as beam directions, gains, or simplified representations) from each hierarchical level, the system maintains reliable channel state information while significantly reducing the feedback payload size.
Data Source
AI summary
The present specification relates to a method by which a terminal designs a hierarchical structure precoder in a vehicle-to-vehicle communication system. The method for designing a hierarchical structure precoder can comprise the steps of: receiving group information indicating a terminal group on the basis of a direction of a first-type beam; feeding back preference information on the first-type beam on the basis of the group information; receiving first-type beam information determined on the basis of the preference information; designing a hierarchical structure precoder including a first precoder and a second precoder, on the basis of the received first-type beam information; and feeding back channel information on the basis of the hierarchical structure precoder, wherein the first precoder can be precoder information on the first-type beam direction, and the second precoder can be precoder information on a second-type beam direction in the first-type beam direction.