CSI Calibration Reporting Using SRS-DL RS Resource Association
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing associations and linkages between downlink and uplink resources for calibration reporting, particularly in 5G/NR systems operating in higher frequency bands, which affect radio interface efficiency and coverage.
Innovation Solution
The implementation of a user equipment (UE) and base station configuration that includes a transceiver and processor for transmitting and receiving channel state information (CSI) reports, using multiple downlink reference signals and sounding reference signal resources for calibration-related measurements, to determine and transmit calibration-related information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple downlink reference signals and sounding reference signal resources are used for calibration reporting, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The calibration reporting process is segmented into distinct components: multiple downlink reference signals (DL RSs) are used for different measurement purposes, and multiple SRS resource sets are configured with specific associations. Each reference signal and resource set serves a specific calibration function, allowing precise measurements while maintaining organized system management.
Solution Approach 2:
The system performs preliminary configuration of SRS resource sets and their associations with DL RSs before actual calibration measurements. The UE is pre-configured with multiple SRS resource sets, each associated with specific DL RSs, so that when calibration is needed, the measurements can immediately use the pre-established resource mappings without additional setup overhead.
2Loss of information
If multiple SRS resource sets with associations are configured, then calibration reporting accuracy is improved, but information overhead increases
Solution Approach 1:
The system implements feedback mechanisms where the UE measures DL RSs using pre-configured SRS resource sets and reports calibration information back to the network. The CSI report includes CLI (Channel Level Information) that provides feedback on the calibration status, allowing the network to assess whether the calibration is sufficient or needs adjustment.
Solution Approach 2:
The system dynamically adjusts calibration reporting parameters such as the number of SRS resource sets, the association configurations, and the triggering conditions based on network conditions and calibration needs. This allows the system to optimize the balance between measurement accuracy and information overhead by changing parameters like the number of reference signals used or the reporting frequency.
Data Source
AI summary
Apparatuses and methods for calibration reporting. A method performed by a UE includes receiving information about a CSI report. The information indicates NTRP>1 downlink reference signals (DL RSs), an associated sounding reference signal (SRS) resource in an SRS resource set from Nset≥1 SRS resource sets, and PSRS≥1 reference antenna ports from x SRS ports of the associated SRS resource. The method further includes transmitting, based on the information, the associated SRS using the PSRS reference antenna ports, receiving, based on the information, the NTRP DL RSs using the PSRS reference antenna ports for calibration-related measurement, determining, based on the information and the calibration-related measurement, calibration-related information (CLI), and transmitting the CSI report including the CLI.