Hierarchical CSI-RS Design for 5G Antenna Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current channel quality reporting processes in wireless communication systems are inadequate for reporting channel state information associated with large two-dimensional array transmit antennas, particularly in 5G communication systems, which require efficient CSI reporting mechanisms to support higher data rates and increased antenna elements.
Innovation Solution
A multi-level hierarchical CSI-RS design is introduced, featuring coverage CSI-RS and UE-specific CSI-RS, along with efficient resource allocation mechanisms, to enhance CSI measurement and reporting, allowing for more accurate channel state information collection and improved resource utilization in 5G systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing channel quality reporting processes are used, then the system maintains backward compatibility with traditional wireless communication systems, but the system cannot sufficiently accommodate reporting of channel state information associated with large two-dimensional array transmit antennas
Solution Approach 1:
The patent segments the CSI reporting process into multiple distinct components: CSI measurement based on reference signals, CSI processing at the user equipment, and separate reporting channels. This segmentation allows the system to handle large antenna arrays by dividing the complex measurement and reporting tasks into manageable parts, thereby improving adaptability without proportionally increasing overall system complexity
Solution Approach 2:
The patent introduces a new dimension to CSI reporting by incorporating two-dimensional antenna array geometry considerations. Instead of traditional one-dimensional or omnidirectional reporting, the system now reports channel state information that specifically accounts for spatial distribution across two-dimensional antenna elements, enabling adaptability to large phased array antennas while maintaining structured reporting formats
2Measurement precision
If more reference signals are transmitted to improve CSI measurement accuracy, then the measurement precision improves, but the resource overhead and system complexity increase
Solution Approach 1:
The patent applies partial action by transmitting reference signals only in specific time-frequency resources and only for specific antenna port combinations that are most critical for accurate CSI measurement. Rather than transmitting reference signals across all possible dimensions, the system selectively activates reference signal transmission based on current channel conditions and antenna configurations, thereby improving measurement precision while controlling resource overhead
Solution Approach 2:
The patent designs reference signals with multi-functionality, where the same reference signal structure serves multiple purposes: channel estimation, CSI measurement, and beam management. This universal reference signal design allows the system to extract multiple types of channel information from a single reference signal transmission, improving measurement precision without proportionally increasing the quantity of reference signals required
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A user equipment (UE) includes at least one transceiver; and at least one processor operably connected to the at least one transceiver and configured to: receive reference signal (RS) resource configuration information and at least two RSs; and measure at least one of the at least two RSs, wherein a first RS of the at least two RSs is non-UE-specifically configured and a second RS of the at least two RSs is UE-specifically configured.