Full Power Uplink Codebook for 5G MIMO
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Solution Overview
Problem
Current 5G communication systems face challenges in supporting efficient uplink (UL) MIMO operations due to limitations in UL channel estimation and precoding, particularly in scenarios with high-mobility UEs or bursty inter-cell interference, where accurate UL-CSI is unavailable at the base station.
Innovation Solution
The implementation of a codebook-based UL transmission method that includes full power and non-full power transmit precoding matrix indicators (TPMIs), allowing user equipment (UE) to transmit UE capability information and receive configuration information for selecting an appropriate UL codebook, enabling efficient UL MIMO operations even when accurate UL-CSI is unavailable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based UL transmission is implemented to support UL MIMO operations, then UL MIMO performance is improved, but device complexity increases due to codebook configuration and TPMI selection
Solution Approach 1:
The base station performs preliminary channel estimation and determines the appropriate codebook configuration and TPMI indicators before uplink transmission. This preliminary action allows the UE to simply apply pre-determined precoding parameters, reducing real-time processing complexity while maintaining UL MIMO performance
Solution Approach 2:
The codebook serves as an intermediary structure that pre-defines precoding matrix indicators (TPMIs) for different channel conditions. By using this pre-configured codebook, the system avoids complex real-time precoding calculations at the UE, simplifying device complexity while enabling effective UL MIMO operations
2Use of energy by moving object
If full power TPMIs are used for all layers, then transmission power efficiency is improved, but measurement precision of UL channel conditions deteriorates due to inability to perform accurate channel estimation
Solution Approach 1:
The system applies full power transmission only to the extent necessary for reliable channel estimation (using non-full power TPMIs for reference signals), while allowing power-efficient full power TPMIs for data transmission. This partial application of full power strategy balances channel estimation accuracy with transmission power efficiency
Solution Approach 2:
The system dynamically changes the TPMI parameter based on the transmission phase: using non-full power TPMIs during channel estimation phases to ensure measurement precision, and switching to full power TPMIs during data transmission phases to maximize power efficiency
3Measurement precision
If non-full power TPMIs are used for channel estimation, then measurement precision of UL channel conditions is improved, but transmission power efficiency decreases
Solution Approach 1:
The transmission process is segmented into distinct phases: channel estimation phase using non-full power TPMIs for accurate measurement, and data transmission phase using full power TPMIs for power efficiency. This segmentation allows each phase to use the optimal TPMI type for its specific function
Solution Approach 2:
The system periodically switches between non-full power and full power TPMI usage based on the transmission phase requirements. During periodic channel estimation intervals, non-full power TPMIs are used; during periodic data transmission intervals, full power TPMIs are used, optimizing both measurement precision and power efficiency over time
Data Source
AI summary
A method of a user equipment (UE) for an uplink (UL) transmission is provided. The method comprises transmitting, to a base station (BS), UE capability information including a full power transmission capability of the UE, receiving, from the BS, configuration information indicating an UL codebook, identifying the UL codebook to use for the UL transmission based on the configuration information, and transmitting, to the BS, the UL transmission based on the UL codebook, where the UL codebook for l layers includes Kl full power transmit precoding matrix indicators (TPMIs) and remaining non-full power TPMIs, where a TPMI indicates a precoding matrix for UL transmission and l indicates a rank value.