DL Grant Dynamic CSI Reporting
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently reporting channel state information (CSI) due to limitations in triggering and scheduling aperiodic CSI reports, which can lead to outdated CSI data, affecting communication quality and reliability.
Innovation Solution
The method involves a base station transmitting a downlink (DL) grant that indicates resources for CSI measurement, allowing user equipment (UE) to perform CSI measurements and transmit aperiodic CSI reports, either based on dedicated CSI-reference signals (CSI-RS) or decoding statistics from downlink control information (DCI), enabling more up-to-date CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aperiodic CSI reports are triggered using conventional methods, then CSI reporting can be performed, but the CSI data becomes outdated and communication quality deteriorates
Solution Approach 1:
The patent implements dynamic triggering of aperiodic CSI reports based on scheduling decisions and channel conditions. The base station dynamically determines when CSI reports should be transmitted by evaluating current scheduling requirements and channel state, allowing the system to adapt CSI reporting timing to actual communication needs rather than following fixed periodic schedules. This dynamic approach ensures CSI data remains current while avoiding unnecessary reporting overhead.
Solution Approach 2:
The patent establishes a feedback mechanism where the base station receives aperiodic CSI reports from the UE and uses this information to make informed scheduling decisions. The CSI feedback loop enables the base station to adjust resource allocation, modulation and coding schemes, and beamforming parameters based on current channel conditions, thereby maintaining high communication quality and reliability.
2Reliability
If frequent CSI reporting is implemented, then CSI data becomes more current, but system overhead and resource consumption increase
Solution Approach 1:
The patent implements partial CSI reporting by selectively reporting only the most relevant channel state parameters based on current communication requirements. Instead of reporting all possible CSI parameters every time, the system reports only the subset of parameters needed for current scheduling decisions, reducing uplink resource consumption while maintaining sufficient CSI freshness for reliable communication.
Solution Approach 2:
The system dynamically adjusts the frequency and content of CSI reports based on channel volatility and scheduling requirements. During periods of rapid channel change, more frequent reporting is triggered, while during stable conditions, reporting frequency is reduced. This dynamic adaptation optimizes the balance between CSI freshness and resource consumption.
Data Source
AI summary
Methods, computer program products, and apparatuses for a dynamic indication of measurement sources for CSI reporting are provided. An example method at a UE includes receiving DCI including a DL grant. The example method further includes measuring the CSI based on a set of resources for measuring CSI based on the DL grant. The example method further includes transmitting at least one aperiodic CSI report associated with the CSI measurements. An example method at a base station includes transmitting a DL DCI including a DL grant to a UE. The DL grant indicating a set of resources for measuring CSI. The example method further includes receiving, based on the DL grant, at least one aperiodic CSI report associated with CSI measurements of the UE.