CSI Feedback Using Shortened Processing Times
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency and improving channel state reporting efficiency, particularly in next-generation mobile communication systems like new radio access technology (new RAT) and LTE, where faster Internet access with shortened latency is crucial.
Innovation Solution
The proposed method involves optimizing channel state measurement and reporting by allowing user equipment (UE) to perform CSI feedback based on shortened processing times, using preconfigured or signaled 'DL-to-UL Tx timing' for aperiodic CSI requests, simplifying CSI calculation, and restricting CSI reporting to only necessary processes and resources, thereby reducing latency and improving scheduling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional CSI reporting methods are used with standard processing times, then measurement accuracy is maintained, but latency is increased
Solution Approach 1:
The system preconfigures multiple CSI reporting settings with different processing time requirements before actual channel state reporting is needed. When latency reduction is required, the network can immediately activate a pre-configured setting with shorter processing time, avoiding the need for real-time configuration changes and enabling faster CSI updates without compromising measurement reliability
Solution Approach 2:
The invention enables dynamic switching between different CSI reporting configurations based on current system requirements. The network can adaptively select between conventional and accelerated reporting modes, adjusting processing times and reporting frequencies in real-time to balance between latency reduction and measurement accuracy based on traffic conditions and channel variability
2Productivity
If CSI processing is simplified to reduce latency, then processing speed is improved, but reporting accuracy may deteriorate
Solution Approach 1:
The CSI reporting process is segmented into different configurations with varying levels of processing complexity. The system divides channel state information into essential parameters that can be quickly processed and reported, versus optional detailed parameters that can be processed when time permits. This segmentation allows the network to request only critical CSI parameters when latency is critical, maintaining adequate reporting accuracy while significantly reducing processing time
Solution Approach 2:
The invention changes key parameters of the CSI reporting process dynamically, including processing time allocations, reporting frequencies, and the set of parameters to be reported. By adjusting these parameters based on current latency requirements, the system can optimize the balance between processing speed and reporting accuracy, enabling faster CSI updates when needed while maintaining sufficient measurement precision
3Adaptability or versatility
If multiple CSI processes are supported simultaneously, then system versatility is improved, but device complexity increases
Solution Approach 1:
The invention implements a universal CSI reporting framework where a single UE capability indication mechanism can handle multiple CSI processes with different configurations. The network configures multiple CSI process IDs, each associated with different reporting settings, but the UE uses a unified processing architecture that can efficiently manage all processes simultaneously. This multi-functionality approach enables the system to support diverse CSI reporting requirements without proportionally increasing UE complexity
Solution Approach 2:
The system enables partial activation of CSI processes based on current needs. While the UE is capable of handling multiple CSI processes simultaneously, the network can activate only the necessary subset of processes at any given time based on traffic conditions and channel requirements. This partial action approach maintains system versatility while preventing excessive complexity from being fully instantiated, allowing the UE to manage a manageable number of active CSI processes while retaining the capability to support more when needed
Data Source
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AI summary
According to one embodiment of the present invention, a method by which a terminal reports a channel state on the basis of a channel state information-reference signal (CSI-RS) in a wireless communication system can comprise the steps of: transmitting, to a base station, terminal capability information related to the maximum number of CSI processes which can be simultaneously updated or calculated by the terminal in which a shortened processing time has been set; receiving an aperiodic CSI request from the base station; and, according to the aperiodic CSI request, updating or calculating CSI in a CSI reference resource at the point of time set for the shortened processing time, on the basis of the terminal capability information and transmitting the updated or calculated CSI to the base station.