CSI Reporting Time Interval Configuration for 5G Uplink Efficiency
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Solution Overview
Problem
In communications systems, timely CSI reporting by terminal devices is crucial for accurate downlink resource allocation by network devices. However, delays in CSI reporting can lead to inefficient resource utilization and communication efficiency issues.
Innovation Solution
A CSI reporting method where a terminal device determines a first time interval based on subcarrier spacing and higher layer signaling to validate CSI reporting triggers, ensuring timely reporting on a designated uplink channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device uses a fixed time interval for CSI reporting, then the reporting timing is simple to determine, but the CSI reporting flexibility is poor and cannot adapt to different subcarrier spacings
Solution Approach 1:
The patent applies dynamics by making the time interval configurable rather than fixed. The network device can dynamically adjust the time interval between DCI transmission and CSI reporting based on different subcarrier spacings and channel conditions, allowing the system to adapt to varying requirements while maintaining clear determination rules through higher-layer signaling configuration.
Solution Approach 2:
The patent changes the time interval parameter based on subcarrier spacing. Different subcarrier spacings (15kHz, 30kHz, 60kHz, 120kHz) are associated with different time interval values, allowing the system to optimize CSI reporting timing for different frequency configurations while the terminal device determines the appropriate interval through configured parameters.
2Reliability
If the terminal device reports CSI immediately when triggered, then the CSI freshness is high, but the network device may not have sufficient processing time for accurate resource allocation
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure the time interval through higher-layer signaling before triggering CSI reporting. This allows the terminal device to prepare for reporting at the predetermined time, ensuring both sufficient processing time for accuracy and timely reporting by following the pre-established timeline.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device reports CSI at the configured time interval after DCI reception. The network device uses this feedback to make accurate resource allocation decisions, and can adjust future time interval configurations based on the quality and timing of received CSI reports.
3Productivity
If the time interval between PDCCH and uplink channel is shortened, then the communication efficiency is improved, but the terminal device may not have sufficient processing time for CSI calculation
Solution Approach 1:
The patent changes the time interval parameter based on subcarrier spacing configuration. For larger subcarrier spacings (60kHz, 120kHz) used in high-frequency 5G scenarios, the patent configures appropriately shorter time intervals that still provide sufficient processing time relative to the faster symbol rates, thereby maintaining measurement accuracy while optimizing communication efficiency for different frequency regimes.
Data Source
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AI summary
This application provides a CSI reporting method and an apparatus. When receiving first indication information used to indicate to trigger reporting of CSI, a terminal device may determine a first time interval from a plurality of candidate first time intervals. The first time interval is used to determine whether the first indication information is valid. The terminal device may report the CSI based on the first time interval, so as to improve communication efficiency.