CSI Report Generation via DL DCI Triggering
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Solution Overview
Problem
Current wireless communication systems, particularly in 3GPP New Radio (NR) specifications, face challenges in efficiently generating and reporting Channel State Information (CSI) for Downlink (DL) transmission, especially in scenarios requiring high reliability and low latency, such as Ultra-Reliable Low Latency Communication (URLLC), due to limitations in CSI reporting configurations and resource management.
Innovation Solution
The method involves receiving control channels that schedule DL data transmissions and allocate Resource Blocks (RBs), determining PRB bundling sizes, and calculating CSI based on Demodulation Reference Signals (DMRS) associated with DL data, allowing for aperiodic CSI reporting triggered by DL assignment, which reduces processing delay and conserves control resources. This approach uses DMRS-based CSI estimation to improve CSI accuracy and reliability, especially in heavy traffic scenarios and for PDSCH retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aperiodic CSI reporting is triggered by UL DCI and transmitted on PUSCH, then CSI reporting flexibility is improved, but processing delay increases and control resources are consumed
Solution Approach 1:
The patent inverts the traditional triggering mechanism by using DL DCI (downlink control information) to trigger CSI reporting instead of UL DCI (uplink control information). This inversion allows the CSI report to be transmitted on the downlink PDSCH (physical downlink shared channel) rather than requiring uplink PUSCH resources, thereby reducing uplink control resource consumption and processing delay while maintaining reporting flexibility
Solution Approach 2:
The patent enables the downlink PDSCH to serve dual purposes: both data transmission and CSI report carrying. By allowing the PDSCH to function as both a data channel and a reporting channel, the system eliminates the need for separate uplink resources, reducing overall resource consumption and processing time while maintaining adaptability
2Reliability
If CSI reporting is performed periodically or semi-persistently, then reporting reliability is improved, but control resource consumption increases
Solution Approach 1:
The patent implements periodic CSI reporting triggered by DL DCI, where the reporting occurs at scheduled intervals determined by the network. This periodic mechanism ensures reliable CSI delivery while allowing the network to control the frequency and timing of reports, optimizing resource usage compared to continuous or semi-persistent reporting schemes
Solution Approach 2:
The patent establishes a feedback loop where the network triggers CSI reporting via DL DCI based on current channel conditions and traffic requirements. This feedback mechanism allows the system to adjust reporting frequency dynamically, ensuring reliability when needed while conserving resources during stable conditions
3Measurement precision
If DMRS-based CSI estimation is used, then CSI accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent uses DMRS (demodulation reference signals) as an intermediary for CSI estimation. The DMRS provides known reference data that facilitates accurate channel estimation without requiring complex processing of the actual data symbols. This intermediary approach simplifies the estimation process while maintaining high accuracy by providing clean, known reference points for measurement
Data Source
AI summary
A control channel can schedule a DL data transmission for a BWP, allocate a set of RBs corresponding to the scheduled DL data, and indicate a first PRB bundling size for the scheduled DL data transmission. A transmitted DL data transmission can be based on each RB of a first PRG having a same precoding applied as other RB of the PRG. The first PRG can partition the BWP with the first PRB bundling size. The second PRG can partition the BWP with a determined second PRB bundling size. A CSI report including the calculated CSI can be received on an UL channel. CSI can be calculated based on at least one DMRS associated with the DL data transmission and based on each RB of a second PRG having a same precoding applied as other RBs of the second PRG.