Uplink PUSCH Precoding Matrix Determination for 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly 5G NR, face challenges in enhancing uplink transmission efficiency due to limitations in precoding matrix determination and dual-codeword transmission functionality, which affect the flexibility and reliability of Uplink (UL) transmissions.
Innovation Solution
A method and apparatus for User Equipment (UE) to receive Radio Resource Control (RRC) messages and Downlink Control Information (DCI) formats, determining a precoding matrix based on the received configurations, and performing codebook-based Physical Uplink Shared Channel (PUSCH) transmissions, including specific parameters for one or two codewords, while enabling or disabling two-codeword transmission functions based on configuration values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based PUSCH transmission with dual-codeword is enabled, then transmission throughput and reliability are improved, but device complexity and configuration requirements increase
Solution Approach 1:
The patent implements dynamic switching between single-codeword and dual-codeword transmission modes based on real-time channel conditions and configuration parameters. The UE determines the transmission mode by evaluating the maxTransmissionRank parameter and other configuration values, allowing flexible adaptation to varying network conditions without requiring permanent complex dual-codeword capability
Solution Approach 2:
The patent utilizes multiple configuration parameters including maxTransmissionRank, txConfig, and DCI format fields to dynamically adjust transmission characteristics. By changing these parameters based on channel conditions, the system optimizes between throughput (dual-codeword) and complexity (single-codeword) without fixed architectural constraints
2Reliability
If two-codeword transmission function is enabled, then transmission reliability is improved, but ease of operation and configuration simplicity deteriorate
Solution Approach 1:
The UE autonomously determines whether to use single or dual codeword transmission by evaluating configured parameters such as maxTransmissionRank and txConfig. The device performs self-assessment of channel conditions and configuration validity, eliminating the need for complex manual configuration or network-side micro-management of transmission mode selection
Solution Approach 2:
The patent performs preliminary validation of configuration parameters before enabling dual-codeword transmission. The UE checks whether configuration values (e.g., maxTransmissionRank > 4, valid DCI format fields) meet required criteria in advance, preventing invalid configurations from causing operational issues and simplifying deployment
3Productivity
If precoding matrix determination is enhanced with multiple fields, then transmission efficiency is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent divides the precoding matrix determination process into discrete, manageable steps based on separate DCI format fields. Each field (first field for SRS resource, second field for precoding matrix index, third and fourth fields for codeword parameters) contributes a specific aspect of the precoding configuration, allowing the UE to process information systematically rather than handling a monolithic complex determination problem
Data Source
AI summary
Methods and apparatuses for Uplink (UL) transmission enhancement are provided. The method includes receiving, from a Base Station (BS), a Radio Resource Control (RRC) message including a Physical Uplink Shared Channel (PUSCH) configuration; receiving, from the BS, a Downlink Control Information (DCI) format including at least one of: a first field that indicates an 8-port Sounding Reference Signal (SRS) resource, a second field that includes an index associated with a precoding matrix transmission, a third field that indicates a first set of parameters for transmitting a first codeword, and a fourth field that indicates a second set of parameters for transmitting a second codeword; determining a precoding matrix based on the DCI format and the PUSCH configuration; and performing a codebook-based PUSCH transmission using the precoding matrix.