Uplink Precoding Control for 6- and 8-Port PUSCH Transmission
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Solution Overview
Problem
The study of precoding matrices for uplink transmission using more than four antenna ports in next-generation mobile communication systems, such as 5G and beyond, has not been advanced, which limits the potential increase in communication throughput.
Innovation Solution
A terminal and base station are designed to receive downlink control information (DCI) for codebook-based physical uplink shared channel (PUSCH) transmission, including precoding information and number of layers field, and control uplink transmission accordingly, enabling appropriate control of UL transmission using more than four antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmission uses more than four antenna ports to increase spectrum efficiency, then communication throughput is improved, but the precoding matrix determination method becomes unclear and control complexity increases
Solution Approach 1:
The DCI is segmented into multiple fields with specific functions: a first field indicates the number of antenna ports (supporting 6 or 8 ports), a second field indicates the number of layers, and a third field indicates the precoding matrix. This segmentation allows independent control of each parameter, making the determination of precoding matrices for 6-rank and 8-rank transmissions clear and manageable, thus resolving the control complexity issue while enabling higher throughput
Solution Approach 2:
The patent extends the antenna port dimension from the traditional 4 ports to 6 or 8 ports by introducing additional antenna ports in the vertical dimension. This dimensional extension enables higher rank transmissions (6-rank and 8-rank) which directly increase spectrum efficiency and communication throughput, while the segmented DCI fields provide clear control mechanisms for this extended dimension
2Adaptability or versatility
If the number of antenna ports is increased to six or eight, then spectrum efficiency is improved, but the precoder determination study has not been advanced and control becomes difficult
Solution Approach 1:
The patent performs preliminary action by pre-defining and signaling the number of antenna ports (6 or 8) through the first field in DCI before the actual transmission occurs. This preliminary indication allows the terminal to prepare the appropriate precoding matrix from predefined codebooks, making the determination process straightforward and advancing the precoder determination methodology for higher antenna configurations
Solution Approach 2:
The patent changes the antenna port parameter from the conventional 4 ports to 6 or 8 ports, and correspondingly changes the rank parameter to support 6-rank and 8-rank transmissions. These parameter changes are controlled through dedicated DCI fields that indicate the specific configuration, making it easy to adapt the system to different spectrum efficiency requirements while maintaining clear control procedures
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives, when the terminal includes eight antenna ports, downlink control information (DCI) including a plurality of fields of at least one of a precoding information and number of layers field and a transmission precoding matrix indicator (TPMI) field for codebook-based physical uplink shared channel (PUSCH) transmission; and a control section that controls uplink transmission, based on the DCI. According to one aspect of the present disclosure, UL transmission using more than four antenna ports can be appropriately controlled.