Differential Beam Feedback for Wireless Channel Information
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving channel information, especially in high-speed mobile scenarios, due to the complexity of implementing large antenna arrays in vehicles, which are aesthetically and aeromechanically restrictive, leading to degraded communication performance and increased costs.
Innovation Solution
A method and apparatus for transmitting channel information in a wireless communication system, where user equipment (UE) receives information about its group, determines differential beam information based on received beam information from a representative UE, and transmits this differential information to the base station, reducing the need for redundant feedback and enhancing beam resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large antenna array is installed in a vehicle to ensure high-quality wireless service in high-speed movement situations, then communication performance is improved, but vehicle design complexity and aesthetic/aeromechanic requirements are worsened
Solution Approach 1:
The patent divides the vehicle into multiple zones (front, rear, left, right) and selects representative user equipment in each zone to report channel information. This segmentation approach allows the system to capture spatial diversity of channel conditions without requiring a physically large antenna array, thus improving communication performance while avoiding the complexity of installing extensive antenna infrastructure in the vehicle.
Solution Approach 2:
The patent uses representative user equipment as intermediaries to report channel information on behalf of multiple UEs in their respective zones. These representative UEs act as mediators that provide indirect channel state information, eliminating the need for direct installation of complex antenna arrays while still enabling the base station to make informed scheduling decisions based on spatial channel characteristics.
2Measurement precision
If channel information from all user equipment is transmitted to the base station, then beam resolution is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential channel information from representative user equipment - specifically, the zone identifier and precoding matrix indicator (PMI) - and transmits this extracted information to the base station. This extraction approach provides sufficient beam resolution for scheduling decisions while significantly reducing the signaling overhead compared to transmitting complete channel state information from all user equipment.
Solution Approach 2:
The patent implements partial action by having only representative UEs (one per zone) report channel information rather than all UEs. This partial reporting strategy provides adequate beam resolution for spatial scheduling while avoiding the excessive signaling overhead that would result from full channel information feedback from every user equipment in the system.
Data Source
AI summary
The present invention relates to a method for transmitting channel information to a base station in a wireless communication system, and a device therefor, the method comprising the steps of: receiving information on a user equipment (UE) group in which a specific UE is included; receiving, from a representative UE of the UE group, first control information comprising first beam information; determining second beam information on the basis of the first beam information; and transmitting, to a base station, second control information comprising differential information between the determined second beam information and the first beam information.