DL Group Common Control Signaling for Aperiodic CSI Triggering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current techniques for triggering aperiodic channel state information (A-CSI) in cellular communication systems are inefficient, particularly in downlink (DL) control channel signaling, leading to increased control resource consumption and power usage, especially in ultra-reliable low latency communications (URLLC) scenarios where sporadic transmissions occur.
Innovation Solution
Implementing DL group common control signaling to trigger A-CSI, utilizing UE-specific fields within the group common DCI format to reduce signaling overhead and complementing it with UL grants, allowing for timely and efficient CSI acquisition and link adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UL grant is used to trigger A-CSI report on PUSCH, then A-CSI feedback can be obtained, but control resource consumption increases and PDCCH blocking probability increases
Solution Approach 1:
The patent extracts the A-CSI trigger function from the UL grant mechanism and implements it through a separate DCI field. This allows the trigger to be sent independently without requiring a full UL grant, thereby reducing control resource consumption while maintaining the ability to obtain A-CSI feedback.
Solution Approach 2:
The patent segments the control signaling by introducing a dedicated CSI trigger field within DCI format 0_1, separating the trigger function from the complete UL grant structure. This segmentation enables efficient triggering with reduced overhead compared to using full UL grants.
2Reliability
If a UL grant is used to trigger A-CSI report, then A-CSI feedback can be obtained, but UE power consumption increases due to blind detections
Solution Approach 1:
The patent extracts the A-CSI trigger function from the UL grant mechanism and implements it through a separate DCI field. This allows the trigger to be sent independently without requiring a full UL grant, thereby reducing control resource consumption while maintaining the ability to obtain A-CSI feedback.
Solution Approach 2:
The patent segments the control signaling by introducing a dedicated CSI trigger field within DCI format 0_1, separating the trigger function from the complete UL grant structure. This segmentation enables efficient triggering with reduced overhead compared to using full UL grants.
3Reliability
If periodic CSI report is used, then channel conditions can be tracked, but it cannot adapt efficiently to sporadic DL URLLC transmissions
Solution Approach 1:
The patent implements dynamic CSI reporting by enabling on-demand triggering through DCI fields. This allows the system to switch between periodic and aperiodic reporting modes, adapting to the sporadic nature of DL URLLC transmissions while maintaining the ability to track channel conditions when needed.
Data Source
AI summary
Embodiments described herein relate to downlink (DL) control channel signaling for an aperiodic channel state information (A-CSI) trigger. In one example, a user equipment (UE) communicates with a network to receive first configuration signaling to identify a first downlink control information (DCI) in a physical downlink control channel (PDCCH). The UE also receives, from the network, the first DCI. The first DCI is appended with cyclic redundancy check (CRC) bits that are scrambled by a common radio network temporary identifier (RNTI) and is to indicate an aperiodic channel state information (A-CSI) trigger. Next, the UE receives, from the network, channel state information (CSI) reference signals in one or more occasions that follow an occasion in which the first DCI is received and generates and transmits a CSI report in a physical uplink control channel (PUCCH) based on the CSI reference signals.