Downlink Grant Triggered CSI Reporting on PUSCH
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently triggering channel state information (CSI) reports on physical uplink shared channels (PUSCH) due to disproportionate downlink traffic, leading to increased bandwidth requirements and latency issues, particularly with the reliance on uplink grants for CSI reporting.
Innovation Solution
The proposed solution involves triggering CSI reports by the user equipment (UE) in response to a downlink grant from the base station, allowing for more up-to-date CSI information and improved downlink scheduling, while minimizing implementation complexities by incorporating an A-CSI request field in the downlink grant message and configuring CSI report configurations for each serving cell or bandwidth part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI reports are triggered by uplink grants, then CSI reporting can be performed, but bandwidth requirements increase and latency is elevated
Solution Approach 1:
The patent inverts the traditional triggering mechanism by using downlink grants instead of uplink grants to trigger CSI reports. This reversal allows the base station to proactively request CSI information when scheduling downlink transmissions, eliminating the need for separate uplink grant signaling and reducing overall latency in the CSI reporting process.
Solution Approach 2:
The patent merges the CSI reporting trigger function into the downlink grant message itself. By incorporating the CSI trigger indication within the existing downlink grant signaling structure, the system combines multiple functions (resource allocation and CSI triggering) into a single signaling event, thereby reducing bandwidth requirements and eliminating the need for additional separate signaling messages.
2Quantity of substance
If downlink grant signaling is used to trigger CSI reports, then bandwidth requirements are reduced, but implementation complexity increases
Solution Approach 1:
The patent enhances the universality of the downlink grant message by adding multi-functionality to it. The downlink grant not only performs its traditional resource allocation function but also serves as a CSI reporting trigger. This is achieved by incorporating a CSI trigger indication field in the downlink grant, allowing a single signaling message to accomplish multiple tasks without requiring additional dedicated signaling resources.
Solution Approach 2:
The patent modifies the parameters of the existing downlink grant signaling structure by adding a CSI trigger indication field. This parameter change enables the downlink grant to carry additional functionality for triggering CSI reports without fundamentally changing the overall signaling framework, thus balancing bandwidth efficiency with manageable implementation complexity.
3Productivity
If CSI reports are triggered more frequently, then downlink scheduling efficiency improves, but collision probability increases
Solution Approach 1:
The patent implements a feedback mechanism where the base station triggers CSI reports based on actual downlink scheduling needs. The CSI trigger indication in the downlink grant allows the base station to request CSI information precisely when it needs to make scheduling decisions, creating a demand-driven feedback loop that improves scheduling efficiency while avoiding unnecessary CSI reports that could lead to collisions.
Data Source
AI summary
Aspects of the present disclosure provide techniques for triggering generation and transmission of a channel state information (CSI) report by the user equipment (UE) on physical uplink shared channel (PUSCH) in response to issuance of at least one downlink grant by the base station.