Uplink SRS Resource Configuration for Precise Channel Delay Capture
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Solution Overview
Problem
Existing SRS resource configurations in 5G NR systems fail to accurately capture transmission paths with smaller delays due to power limitations of terminals, leading to inadequate channel delay information and reduced uplink coverage.
Innovation Solution
Configuring SRS resources based on preset bandwidth, frequency domain density, and time domain parameters to enhance uplink channel state information acquisition, allowing terminals to send SRS on larger bandwidths and adjust frequency domain density for improved signal-to-interference-plus-noise ratio and increased coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal sends SRS on a larger bandwidth to capture transmission paths with smaller delays, then the channel delay information accuracy is improved, but the terminal power consumption increases and uplink coverage decreases
Solution Approach 1:
The SRS resource configuration is segmented into multiple parameters including bandwidth parameter, frequency domain density parameter, and time domain parameter. This segmentation allows the system to optimize each parameter independently to achieve accurate delay information while controlling power consumption.
Solution Approach 2:
The patent changes multiple parameters of the SRS resource configuration simultaneously: increasing bandwidth parameter to capture more transmission paths, adjusting frequency domain density parameter to optimize sampling rate, and configuring time domain parameter to control the number of OFDM symbols. These parameter changes work together to improve measurement precision while managing power consumption.
2Measurement precision
If the terminal sends SRS on more frequency domain resources to increase bandwidth, then the channel state information accuracy is improved, but the terminal cannot simultaneously send SRS on more subcarriers due to power limitation
Solution Approach 1:
The SRS resource configuration is made dynamic through multiple configurable parameters. The bandwidth parameter, frequency domain density parameter, and time domain parameter can be adjusted according to terminal capabilities and channel conditions, allowing the system to adapt between coverage and accuracy requirements.
Solution Approach 2:
The patent applies partial action by configuring SRS on a subset of frequency domain resources rather than all available subcarriers. The frequency domain density parameter controls the sampling rate, allowing the system to obtain sufficient channel state information with reduced terminal transmission burden.
3Device complexity
If the frequency interval of the Comb structure is small (small η U), then the SRS resource configuration is simple, but the transmission path with smaller delay cannot be captured
Solution Approach 1:
The patent introduces a bandwidth parameter that can be configured to increase the frequency interval of the Comb structure. This parameter change allows the system to capture transmission paths with smaller delays while maintaining reasonable configuration complexity through standardized parameter settings.
Data Source
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AI summary
The present disclosure relates to the technical field of communications, and in particular to a method and apparatus for acquiring uplink channel state information, which are used for acquiring a transmission path with a relatively low delay. The method comprises: a network side device generating SRS resource configuration information on the basis of a preset bandwidth parameter, a frequency domain density parameter and a time domain parameter, and receiving at least one SRS returned by a terminal on the basis of the SRS resource configuration information; and then the network side device measuring, on the basis of the at least one SRS, an uplink channel used by the terminal, and determining corresponding uplink channel state information. In this way, SRS resource configuration information is generated by means of a preset bandwidth parameter and frequency domain density parameter, such that a bandwidth configuration of an SRS resource can be increased, and a frequency domain density of the SRS resource can be reduced, thereby improving a signal to interference plus noise ratio of each SRSRE; and a network side device can capture transmission paths with different time delays, thereby designing a port selection codebook with a higher precision.