UE Group Precoding for Vehicular Beamforming
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively transmitting and receiving control information, measuring and reporting channels, and performing beamforming, especially in high-speed vehicular environments, due to spatial restrictions and the need for high-quality service support.
Innovation Solution
A method and apparatus for transmitting precoding information in a wireless communication system, where user equipment receives group information and first control information from a base station, determines second precoding information, and transmits it back, enabling effective beamforming and channel measurement through UE grouping and hierarchical precoder design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large antenna array is installed in a vehicle to achieve high-quality wireless service through large array gain and Rx diversity, then communication performance is improved, but the device complexity and difficulty of installation increase due to spatial restrictions and aesthetic/aeromechanic design constraints
Solution Approach 1:
The patent divides the large antenna array into multiple distributed antenna units that can be installed at different locations on the vehicle. Each antenna unit operates independently but cooperates with others to achieve the desired array gain and diversity effects, thereby reducing installation complexity while maintaining communication performance.
Solution Approach 2:
The patent integrates multiple antenna elements within compact antenna units that can be nested or combined in a space-efficient manner. This allows the vehicle to achieve large array gain without requiring excessive space, thus resolving the conflict between performance and installation constraints.
2Ease of manufacture
If distributed antenna array system is used to resolve spatial restriction, then ease of installation is improved, but the device complexity increases due to coordination and control of multiple distributed arrays
Solution Approach 1:
The patent combines multiple distributed antenna units into a unified virtual antenna array through signal processing and coordination algorithms. This merging approach allows each distributed unit to be installed independently (improving ease of installation) while the combined system achieves the performance of a large coordinated array.
Solution Approach 2:
The patent introduces a central controller or coordination mechanism that acts as an intermediary between distributed antenna units and the base station. This intermediary manages the coordination and control signals, simplifying the overall system complexity while enabling effective operation of the distributed array system.
3Loss of information
If UE grouping with representative UE is implemented to reduce signaling overhead, then loss of information is reduced, but measurement precision may be affected due to indirect channel measurement
Solution Approach 1:
The patent implements a feedback mechanism where the representative UE measures the channel and provides feedback to the base station, which then uses this information to optimize transmissions to all UEs in the group. This feedback loop maintains measurement precision while reducing signaling overhead by having only one UE perform the measurement.
Solution Approach 2:
The patent uses the channel measurement obtained from the representative UE as a proxy or copy for the channel conditions of other UEs in the group. By assuming similar channel characteristics within the group, the system reduces signaling overhead while maintaining acceptable measurement precision through the representative measurement.
Data Source
AI summary
The present invention relates to a method and apparatus for transmitting precoding information by a specific user equipment (UE) in a wireless communication system. More specifically, the present invention relates to a method comprising receiving group information from a base station (BS), the group information comprising information indicating a representative UE in a UE group and information indicating one or more member UEs, the specific UE being one of the one or more member UEs; receiving first control information transmitted from the representative UE or the BS, the first control information comprising first precoding information; determining second precoding information based on the first precoding information; and transmitting second control information comprising the determined second precoding information to the BS; and an apparatus therefor.