SRS Precoder Determination via CSI-RS Timing Offset
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Solution Overview
Problem
In future radio communication systems, determining the appropriate SRS precoder for PUSCH transmission is challenging, leading to potential system throughput reductions due to unclear UE operations related to CSI-RS usage.
Innovation Solution
A user terminal identifies a reference resource for determining the SRS precoder, using the latest transmitted CSI-RS resource based on a defined timing offset, to accurately determine the SRS precoder for PUSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE determines the SRS precoder based on CSI-RS without clear operation specifications, then the system flexibility is maintained, but the system throughput decreases due to ambiguous UE operations
Solution Approach 1:
The patent changes the parameter of CSI-RS resource identification from ambiguous to specific by introducing explicit timing relationship parameters (k0, k2) that define the exact offset between triggering DCI and CSI-RS transmission. This parameter specification resolves the operational ambiguity while maintaining system flexibility, directly improving throughput by ensuring correct precoder determination.
Solution Approach 2:
The patent applies preliminary action by pre-defining the timing relationship between DCI triggering and CSI-RS transmission through higher-layer parameters. This preliminary configuration ensures that the UE can correctly identify the reference CSI-RS resource before actual transmission occurs, eliminating operational ambiguity and enabling accurate SRS precoder determination.
2Adaptability or versatility
If two DCIs are used to separately trigger CSI-RS and SRS, then the control flexibility is improved, but the signaling overhead increases and association ambiguity occurs
Solution Approach 1:
The patent merges the triggering function into a single DCI that simultaneously triggers both SRS and the associated CSI-RS using a unified SRS request field. This consolidation reduces signaling overhead by eliminating redundant triggering messages while maintaining control flexibility through the configurable timing parameters within the same DCI structure.
Solution Approach 2:
The patent enhances the universality of the DCI format by making the SRS request field serve multiple functions: it can trigger SRS transmission, trigger associated CSI-RS transmission, and encode timing relationship information. This multi-functionality reduces the need for separate DCIs while preserving control flexibility through configurable parameters.
Data Source
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AI summary
An SRS precoder is appropriately determined. A user terminal according to one aspect of the present disclosure includes: a control section that identifies a resource for a Channel State Information-Reference Signal (CSI-RS); and a transmitting section that transmits a Sounding Reference Signal (SRS) by using a precoder based on the latest transmitted resource.