Reference Signal Transmission for Reduced-Resource Channel Estimation
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Solution Overview
Problem
In time division duplexing (TDD) systems, the fixed allocation of time-frequency resources for sounding reference signals (SRS) leads to insufficient resources as the number of terminal devices and antennas increases, affecting channel estimation performance and reducing network throughput.
Innovation Solution
A method for determining a reduced set of reference signal resources to estimate channels for multiple antennas, utilizing auto-correlation and cross-correlation information to efficiently determine channels using fewer resources, and employing adaptive feature bases for channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of reference signal ports is reduced to decrease resource usage, then resource consumption is reduced, but channel estimation completeness may be compromised
Solution Approach 1:
The patent segments the channel estimation process into two stages: first estimating channels for Ns antennas using a reduced reference signal resource set, then deriving channels for remaining antennas through correlation relationships. This segmentation allows complete channel estimation for all Nr antennas while using fewer reference signal resources than traditional methods.
Solution Approach 2:
The patent introduces correlation information (auto-correlation and cross-correlation) as an intermediary to bridge the reduced reference signal measurements and the complete channel state. By utilizing correlation relationships between different antenna channels, the system can infer channel information for antennas not directly measured, thus completing channel estimation without requiring full reference signal coverage.
2Productivity
If fewer reference signal resources are used, then resource consumption decreases, but the ability to determine channels for all antennas deteriorates
Solution Approach 1:
The patent applies partial action by measuring channels for only Ns antennas (a subset) using reduced reference signal resources, rather than requiring measurements for all Nr antennas. The partial channel estimates combined with correlation relationships enable complete channel determination for all antennas, achieving both resource efficiency and measurement completeness.
Solution Approach 2:
The correlation information serves multiple functions: it characterizes the relationship between different antenna channels, enables derivation of unmeasured channels from measured ones, and maintains the reliability of channel estimation despite reduced measurement resources. This multi-functionality allows the system to achieve complete channel determination with partial measurements.
Data Source
AI summary
A reference signal transmission method includes determining, by a terminal device, a first reference signal resource set. The first reference signal resource set includes Ns reference signal ports. The first reference signal resource set is used to determine a first channel. The first channel is used to determine a second channel. The first channel is a channel corresponding to Ns antennas of the terminal device. The second channel is a channel corresponding to Ns′ antennas of the terminal device other than the Ns antennas. Both Ns and Ns′ are positive integers.