Phase-Consistent SRS Transmission for Accurate Precoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing SRS-based channel measurement methods in wireless communication systems result in high resource overhead and lag/inaccuracy due to frequent SRS transmissions and complex TRS-based TDCP measurements, leading to inefficient precoding matrix adaptation and increased signaling overhead.
Innovation Solution
Implementing SRS transmission on multiple resources or resource sets with consistent phase and identical transmission mode and resource, reducing the need for frequent SRS transmissions and simplifying TDCP measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequent SRS transmission is configured to adapt precoding matrix to current channel, then precoding accuracy is improved, but SRS resource overhead increases
Solution Approach 1:
The patent combines multiple SRS resources or resource sets into a unified transmission framework where SRSs are transmitted across multiple resources with phase consistency. This merging approach allows the network device to perform channel measurement more efficiently by utilizing correlated channel information across multiple resources, thereby reducing the total SRS resource overhead while maintaining precoding accuracy.
Solution Approach 2:
The patent implements preliminary channel measurement using SRS transmitted on multiple resources before the actual uplink or downlink transmission. By performing channel measurement in advance with phase-consistent SRS transmissions, the network device can determine the precoding matrix earlier, reducing the lag between channel measurement and transmission while avoiding the need for frequent SRS transmissions closer to the transmission time.
2Measurement precision
If SRS transmission is performed to obtain current channel measurement, then precoding matrix accuracy is improved, but time lag relative to scheduled transmission increases
Solution Approach 1:
The patent performs channel measurement using SRS transmitted on multiple resources in advance of the scheduled uplink or downlink transmission. By utilizing phase consistency across multiple SRS resources, the network device can accurately determine the precoding matrix earlier, reducing the time lag between channel measurement and actual transmission while maintaining measurement accuracy.
3Loss of information
If TRS-based TDCP measurement is performed, then time domain channel properties are obtained, but measurement complexity and signaling overhead increase
Solution Approach 1:
The patent extracts the essential channel measurement function from the complex TRS-based TDCP measurement framework. By using SRS transmitted on multiple resources with phase consistency, the network device can obtain the necessary time domain channel properties without requiring the terminal device to perform complex TDCP measurements and feedback, thereby reducing measurement complexity and signaling overhead while still acquiring the required channel information.
Data Source
AI summary
An SRS transmission method and a terminal device are provided. The method includes an operation as follows. A terminal device sends SRSs on multiple SRS resources or multiple SRS resource sets. The SRSs on the multiple SRS resources or the multiple SRS resource sets adopt the same transmission mode and the same transmission resource, and have phase consistency.