CSI Resource Allocation on PUSCH for 5G NR Variable DMRS
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Solution Overview
Problem
In the 5G NR system, there is no established method to determine the resource allocation for the transmission of each part of Channel State Information (CSI) on the Physical Uplink Shared Channel (PUSCH) when no Uplink Shared Channel (UL-SCH) data is transmitted, differing significantly from the LTE system.
Innovation Solution
A CSI transmission method that determines the resource allocation for the first and second parts of CSI on the PUSCH by calculating available resources based on a target code rate for the first part and utilizing the remaining resources for the second part, with specific formulas to quantify the required resources for each part, ensuring accurate transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LTE system uses fixed DMRS positions and resource mapping mechanisms, then the resource allocation is simple and deterministic, but the mechanism cannot be applied to the 5G NR system where DMRS positions and quantities are variable
Solution Approach 1:
The patent changes the parameters used for resource determination from fixed LTE-style parameters to 5G NR-specific parameters including variable DMRS positions, different cyclic prefix lengths, and flexible subcarrier spacing. The method calculates available resources based on the actual DMRS configuration rather than assuming fixed positions, enabling adaptability to various 5G NR scenarios.
Solution Approach 2:
The patent segments the CSI report into two distinct parts (first part and second part) and determines resources for each part separately. The first part uses a target code rate to determine its resource requirement, while the second part uses the remaining resources, allowing independent optimization and handling of different CSI components.
2Measurement precision
If the system divides CSI into two parts with separate resource determination, then the resource allocation becomes more flexible and accurate, but the calculation complexity increases
Solution Approach 1:
The patent performs preliminary determination of resources for the first part of CSI by calculating the required resources based on target code rate before determining resources for the second part. This sequential approach (first determining Part 1 resources, then allocating remaining resources to Part 2) simplifies the overall calculation compared to simultaneous optimization of both parts.
Solution Approach 2:
The system determines resource allocation autonomously using predefined formulas and parameters without requiring additional signaling or negotiation between UE and network. The UE calculates available resources, determines target code rates, and allocates resources to different CSI parts based on local computations using standard-formula-based methods.
Data Source
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AI summary
A CSI transmission method, a communication device and a device are provided. The CSI transmission method includes: determining a resource available for the transmission of the first part of the CSI on a PUSCH in accordance with a target code rate used by the first part of the CSI; and determining an available resource on the PUSCH other than the resource available for the transmission of the first part of the CSI as a resource available for the transmission of the second part of the CSI on the PUSCH.