Multi-Antenna Reference Signal Transmission via RF Chain Segmentation
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Solution Overview
Problem
In multi-antenna wireless communication systems, existing methods face challenges in efficiently transmitting reference signals, particularly in managing beamforming and feedback overhead, especially with the increasing complexity of antenna configurations and the need for precise channel quantization.
Innovation Solution
A method involving a base station with multiple RF chains and phase shifters to transmit distinct reference signals, such as CSI-RS, DMRS, and CRS, using different time and frequency resources, and configuring these signals to apply FDM and TDM without CDM, allowing for flexible beam control and reduced feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple reference signals are transmitted using the same RF chain and time resources, then device complexity is reduced, but measurement precision and channel quantization accuracy deteriorate
Solution Approach 1:
The patent segments the antenna system into multiple RF chains, where each RF chain transmits a distinct reference signal (CRS, CSI-RS, DM-RS) with independent beamforming. This segmentation allows each reference signal to be measured separately with high precision while managing complexity through structured resource allocation.
Solution Approach 2:
The patent introduces time and frequency resource dimensions to differentiate reference signal transmissions. By allocating different time slots and frequency resources to different RF chains and reference signals, the system achieves precise channel measurement without requiring all signals to occupy the same physical resources simultaneously.
2Productivity
If beamforming is applied to enhance data transfer rate, then productivity increases, but feedback overhead increases
Solution Approach 1:
The patent applies beamforming selectively to specific reference signals based on their function and channel conditions. Not all reference signals require full beamforming processing, allowing the system to achieve sufficient productivity enhancement while reducing the computational and feedback overhead associated with comprehensive beamforming across all signals.
3Device complexity
If multiple reference signals are transmitted simultaneously on the same resources, then device complexity is reduced, but object-generated harmful factors increase due to interference
Solution Approach 1:
The patent segments reference signal transmissions across different RF chains with dedicated time and frequency resources. This segmentation prevents simultaneous transmission of multiple reference signals on the same resources, thereby eliminating self-interference while maintaining manageable device complexity through structured resource allocation.
Solution Approach 2:
The patent introduces resource allocation patterns and scheduling mechanisms as intermediaries between the need for multiple reference signals and the constraint of avoiding interference. These intermediaries coordinate the transmission timing and frequency assignment of different reference signals, preventing harmful interference while enabling comprehensive channel measurement.
Data Source
AI summary
The present invention relates to a base station in a wireless communication system which supports multi-antennas with multiple horizontal domains and multiple vertical domains. Particularly, the present invention comprises: a radio frequency unit and a processor, wherein the radio frequency unit comprises a first radio frequency (RF) chain and a second radio frequency (RF) chain which are connected to antenna elements corresponding to multiple vertical antennas with specific horizontal domains, wherein the processor, connected to the radio frequency unit, is configured to transmit reference signals, and wherein the first RF chain and the second RF chain are configured for different reference signals.