CSI Reporting Method for Accurate PDSCH Resource Calculation
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Solution Overview
Problem
In 5G wireless communication systems, accurately determining the resources used for transmitting physical downlink shared channels (PDSCH) is challenging due to changes in transmission resources, such as varying time-domain lengths and the shift from CRS to DMRS for demodulation, which affects the performance of PDSCH transmission.
Innovation Solution
A method for reporting channel state information (CSI) that involves determining the number of resources occupied by DMRS and downlink control information (DCI) within time-domain transmission blocks, excluding these resources to calculate the resources used for PDSCH transmission, and reporting the CSI accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resources occupied by DMRS and DCI are excluded from total resources to calculate PDSCH resources, then measurement precision of PDSCH resources is improved, but device complexity increases
Solution Approach 1:
The patent segments the resource calculation process into distinct steps: first determining total resources, then separately identifying and excluding DMRS resources and DCI resources, finally calculating PDSCH resources. This segmentation improves measurement precision by systematically accounting for each resource type while organizing the complexity into manageable segments.
Solution Approach 2:
The patent performs preliminary determination of DMRS and DCI resource occupations before calculating PDSCH resources. By pre-identifying the resources occupied by reference signals and control information, the calculation of available PDSCH resources becomes more accurate without performing complex real-time subtractions during data transmission.
2Reliability
If accurate determination of PDSCH transmission resources is implemented, then reliability of data transmission is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent performs preliminary determination of PDSCH transmission resources by first identifying total resources and then subtracting DMRS and DCI occupations. This advance calculation ensures accurate resource allocation for reliable transmission while simplifying the actual detection process during data reception, as the resource boundaries are pre-established.
Solution Approach 2:
The patent segments resource detection into separate identifiable components: total resources, DMRS resources, DCI resources, and PDSCH resources. This segmentation makes detection easier by providing clear boundaries and definitions for each resource type, reducing the overall difficulty of measuring and identifying PDSCH transmission resources.
3Manufacturing precision
If the number of resources occupied by DMRS is determined and excluded, then manufacturing precision of resource allocation is improved, but loss of time in calculation increases
Solution Approach 1:
The patent performs preliminary determination of DMRS resource occupation before CSI calculation. By pre-identifying the resources occupied by demodulation reference signals, the system achieves precise resource allocation for PDSCH while reducing calculation time during actual CSI reporting, as the DMRS resource mask is already established.
Solution Approach 2:
The patent changes the parameter representation by introducing a resource occupation indicator that specifies the number of resources occupied by DMRS. This parameter change allows the system to efficiently track and exclude reference signal resources without performing complex real-time calculations, thereby maintaining precision while reducing computational time.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure discloses a method for reporting channel state information CSI, including: determining, by a user equipment (UE), a number of resources occupied by a demodulation reference signal (DMRS) used when calculating CSI; determining, by the UE, a number of resources used to transmit a physical downlink shared channel (PDSCH) used when calculating the CSI according to the number of resources occupied by the DMRS; and calculating, by the UE, the CSI according to the number of resources used to transmit the PDSCH determined, and reporting the CSI. Using the present disclosure can guarantee the performance of transmitting PDSCHs in a NR system.