Uplink SRS Beamforming for Precise Channel Feedback
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Solution Overview
Problem
Existing uplink transmission technologies in wireless communication networks suffer from low precoding precision and reliability due to the limitations of wideband precoding methods, especially in cases where uplink and downlink channels are partially reciprocal, leading to inadequate performance improvement.
Innovation Solution
A method and apparatus that perform beamforming on a sounding reference signal (SRS) using target parameters determined from downlink channel information, allowing for improved channel state information feedback and precoding, thereby enhancing the precision and reliability of uplink transmission signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wideband precoding is used for uplink transmission, then the device complexity is reduced and ease of operation is improved, but the manufacturing precision (precoding precision) deteriorates
Solution Approach 1:
The patent segments the precoding process into two parts: wideband precoding for coarse beam direction and subband precoding for fine precision adjustment. The terminal device performs wideband channel measurement to determine a first precoding matrix, then the network device provides second precoding information for subband refinement, combining both approaches to achieve high precision while maintaining operational simplicity
Solution Approach 2:
The terminal device performs wideband channel measurement and determines the first precoding matrix in advance before actual uplink transmission. This preliminary action establishes a baseline precoding configuration that can be quickly refined with minimal additional signaling, reducing real-time processing complexity while maintaining precision
2Loss of time
If downlink channel measurement is used to obtain precoding in partially reciprocal channels, then the measurement time is reduced, but the measurement precision deteriorates
Solution Approach 1:
The channel measurement process is segmented into wideband downlink channel measurement for obtaining large-scale channel characteristics (path loss, shadowing, angle of arrival) and subband uplink channel measurement for fine-grained channel state information. This segmentation allows time efficiency from downlink measurement while achieving precision through complementary uplink measurement
Solution Approach 2:
The patent introduces SRS (Sounding Reference Signal) as an intermediary mechanism. The terminal device transmits SRS on uplink to enable the network device to obtain accurate channel state information, while the terminal device uses downlink channel measurement results to guide the precoding selection. This intermediary approach bridges the gap between time-efficient downlink measurement and precision-required uplink transmission
Data Source
AI summary
Provided are a method and apparatus for uplink transmission, a method and apparatus for receiving signal, a terminal device, a service node and a non-transitory computer-readable storage medium. The method for uplink transmission may include: performing beamforming on a Sounding Reference Signal (SRS) according to a target parameter, and transmitting the SRS beamformed, wherein the target parameter is determined according to downlink channel information; receiving precoding information; and transmitting an uplink transmission signal according to the target parameter and the precoding information.