Unified CSI Reporting for Multi-Antenna Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving channel state information (CSI) in multi-antenna systems, particularly in 2D active antenna systems, leading to increased feedback overhead and reduced accuracy due to the complexity of channel measurement and reporting mechanisms.
Innovation Solution
A method for reporting CSI in a multi-antenna wireless communication system that combines non-precoded and beamformed CSI-RS based reporting, allowing User Equipment (UE) to report Precoding Matrix Indicators (PMI) and Rank Indicators (RI) based on configuration information received from the base station, with specific rules for determining the values and precoding matrix selection to reduce feedback overhead and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate reporting for non-precoded CSI-RS and beamformed CSI-RS is used, then measurement accuracy is improved, but feedback overhead increases
Solution Approach 1:
The patent combines non-precoded CSI-RS and beamformed CSI-RS reporting into a single unified CSI report. The UE measures both types of CSI-RS resources and generates one integrated CSI report containing PMI, RI, and CQI that reflects the combined channel state information from both non-precoded and beamformed measurements, thereby reducing feedback overhead while maintaining measurement accuracy.
Solution Approach 2:
The unified CSI reporting mechanism serves multiple functions simultaneously: it captures both non-precoded and beamformed channel characteristics, supports various transmission modes, and provides comprehensive channel state information for different antenna ports through a single reporting structure, making the system more versatile and efficient.
2Reliability
If comprehensive CSI reporting is implemented, then system performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the CSI reporting process into distinct components: non-precoded CSI-RS measurement, beamformed CSI-RS measurement, and unified report generation. Each component is handled separately with specific measurement rules and processing steps, but they are integrated into a single cohesive reporting mechanism that maintains manageable complexity while achieving comprehensive system performance improvement.
3Measurement precision
If multiple CSI-RS types are measured, then channel state accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary measurements on both non-precoded and beamformed CSI-RS resources in advance, storing the measurement results for subsequent unified reporting. The UE prepares the channel state information from both CSI-RS types beforehand, allowing the actual CSI report to be generated efficiently without excessive processing delays when needed.
Data Source
AI summary
A method and an apparatus for transmitting and receiving channel state information in a multi-antenna wireless communication system are disclosed. Specifically, a method for reporting channel state information (CSI), by a User Equipment (UE), in a multi-antenna wireless communication system, the method comprising receiving, from a base station, configuration information for single CSI reporting in which a non-precoded CSI-RS based CSI reporting and a beamformed CSI-RS based CSI reporting are combined, reporting a first Precoding Matrix Indicator (PMI) and/or a first Rank Indicator (RI) derived based on a non-precoded CSI-RS to the base station, and reporting a Channel Quality Indicator (CQI), a second PMI, and a second RI based on a beamformed CSI-RS to the base station, wherein a value of the first RI is determined as only a value belonging to a previously determined set.