Aperiodic CSI Reporting via DCI Triggering in Carrier Aggregation
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Solution Overview
Problem
In wireless communication systems supporting carrier aggregation, there is a challenge in effectively reporting channel status information (CSI) due to the complexity of managing multiple component carriers and scheduling information across different duplex modes, which affects the efficiency of data transmission and reception.
Innovation Solution
A method for a user equipment (UE) to efficiently report aperiodic CSI by receiving downlink control information (DCI) for uplink grants, generating CSI for measurement targets triggered by the DCI, and transmitting this CSI through specific uplink component carriers, while managing collisions and resource allocation to ensure accurate and timely reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to support wider bandwidth and increased traffic load, then system capacity and data transmission rate are improved, but the complexity of managing multiple component carriers and scheduling information increases
Solution Approach 1:
The patent segments the channel status information reporting by separating periodic CSI and aperiodic CSI reporting mechanisms. The aperiodic CSI is further segmented into triggers received via DCI on different component carriers. This segmentation allows independent management and optimization of each reporting type, reducing overall system complexity while maintaining high capacity.
Solution Approach 2:
The patent introduces a new dimension for CSI reporting by utilizing the timing relationship between DCI reception and PUSCH transmission across multiple component carriers. By adding the time dimension and carrier dimension to CSI reporting management, the system can handle multiple component carriers more efficiently without linearly increasing complexity.
2Measurement precision
If aperiodic CSI is triggered by DCI for UL grant on multiple DL CCs, then CSI reporting accuracy and timeliness are improved, but resource allocation complexity and collision management difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple DL CCs and their associated UL CC mappings before CSI reporting is needed. The base station pre-arranges the DCI formats and CSI trigger conditions, so when aperiodic CSI triggering occurs, the UE can immediately execute the reporting without complex real-time decision-making, thus improving accuracy while managing complexity.
Solution Approach 2:
The patent introduces dynamic carrier indication in DCI formats, allowing the base station to flexibly select which DL CC's CSI should be reported on which UL CC based on current channel conditions and traffic requirements. This dynamic approach enables adaptive resource allocation that improves CSI accuracy while avoiding rigid complex resource management schemes.
3Adaptability or versatility
If multiple UL CCs are used for CSI transmission, then reporting flexibility and system adaptability are improved, but collision management between periodic and aperiodic CSI becomes more difficult
Solution Approach 1:
The patent changes the parameter of carrier indication in DCI formats to dynamically select which UL CC should carry the aperiodic CSI report. By modifying the carrier indication parameter based on current collision conditions, the system achieves flexible collision management while maintaining high reporting flexibility. The UE monitors multiple UL CCs and can adaptively switch reporting destinations.
Data Source
AI summary
A method for a user equipment for reporting aperiodic channel status information in a carrier aggregation system according to one embodiment of the present invention is carried out by the user equipment and may comprise the steps of: receiving DCI, comprising a CSI request field, for approving a downlink from a base station; generating aperiodic CSI for a CSI measurement target included in a particular triggering set corresponding to the particular bit value of the CSI request field; and transmitting the generated aperiodic CSI to the base station.