CSI Reporting Triggered by Downlink Failure Detection
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Solution Overview
Problem
Current CSI reporting methods in communication networks are not sufficiently timely or accurate, leading to high latency and low spectrum efficiency, especially in critical machine-type communication (CMTC) and ultra-reliable low latency communication (URLLC) services, where precise link adaptation is required for low latency and high reliability.
Innovation Solution
A method where a terminal device detects a downlink transmission and transmits a CSI report in an uplink control resource configured for CSI reporting, such as a Physical Uplink Control Channel (PUCCH) resource, in response to detecting a downlink transmission failure or a specific trigger, allowing for timely and accurate CSI reporting to the network node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large radio resource is allocated to transmit a data packet with conservative link adaptation, then reliability is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent implements dynamic link adaptation by enabling the UE to report CSI when downlink transmission fails, allowing the eNB/gNB to adjust transmission parameters in real-time based on current channel conditions. This dynamic adjustment replaces conservative static resource allocation with adaptive resource usage, maintaining reliability while improving spectrum efficiency.
Solution Approach 2:
The patent introduces a feedback mechanism where the UE detects downlink transmission failure and reports CSI back to the eNB/gNB. This feedback loop enables the network to quickly identify channel degradation and adjust transmission parameters, replacing the need for conservative pre-allocation with informed adaptive allocation, thus improving spectrum efficiency while maintaining reliability.
2Productivity
If swift and accurate link adaptation is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent extracts the CSI reporting function from the standard periodic reporting mechanism and triggers it specifically upon downlink transmission failure detection. This selective extraction reduces unnecessary reporting overhead and simplifies the overall system operation while maintaining swift link adaptation when needed, thus improving productivity without significantly increasing device complexity.
Solution Approach 2:
The patent configures the UE in advance with the capability to detect downlink transmission failures and report CSI upon such events. This preliminary configuration enables rapid response when failures occur without requiring complex real-time decision-making during the actual failure event, thereby improving system efficiency while keeping device complexity manageable.
3Loss of time
If timely CSI updating is implemented, then loss of time is reduced, but device complexity increases
Solution Approach 1:
The patent implements a periodic-like triggering mechanism where CSI reporting is activated at specific intervals defined by downlink transmission attempts. Instead of continuous monitoring and reporting, the system checks for transmission failures at predetermined intervals and triggers CSI reporting only when failures are detected, reducing latency while avoiding the complexity of continuous real-time monitoring.
Data Source
AI summary
Various embodiments of the present disclosure provide a method for CSI reporting. The method comprises detecting a downlink transmission, and transmitting, in response to the detection of the downlink transmission, a channel state information (CSI) report in an uplink control resource configured for CSI reporting. According to the embodiments of the present disclosure, a timely and accurate CSI reporting can be provided.