Resource-Level Uplink Reference Signal Precoding for MIMO Scheduling
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Solution Overview
Problem
Existing technologies face challenges in accurately configuring uplink reference signals for multi-user MIMO systems, leading to suboptimal uplink scheduling decisions due to inadequate channel measurement results.
Innovation Solution
A method for determining downlink reference signal resources and corresponding precoding matrices for uplink reference signals, allowing for flexible precoding configurations that decouple the precoding matrix from the size of the uplink reference signal resource, enabling accurate channel measurement and improved scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the precoding matrix is tied to the size of the uplink reference signal resource, then the configuration is simplified, but the measurement precision and scheduling accuracy deteriorate
Solution Approach 1:
The patent segments the uplink reference signal resource into multiple first resources (time-domain or frequency-domain units). Each first resource is independently associated with a downlink reference signal resource and uses an independently determined precoding matrix. This segmentation allows the system to move from a single precoding matrix for the entire resource to multiple precoding matrices for sub-resources, thereby improving measurement precision without excessive configuration complexity.
Solution Approach 2:
The patent introduces a new dimension of granularity by defining first resources as smaller time-domain or frequency-domain units within the uplink reference signal resource. This dimensional segmentation enables independent precoding matrix determination for each first resource based on corresponding downlink reference signal resources, achieving finer-grained channel measurement while maintaining manageable configuration through systematic association rules.
2Device complexity
If a single precoding matrix is used for the entire uplink reference signal resource, then the configuration is simpler, but the adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent applies local quality by allowing different precoding matrices to be used for different first resources within the uplink reference signal resource. Each first resource can be adapted to local channel conditions through its associated downlink reference signal resource, enabling the system to respond to spatial and temporal variations in channel characteristics while maintaining an organized configuration structure.
Solution Approach 2:
The patent introduces dynamics by enabling the precoding matrix to vary across different first resources based on their corresponding downlink reference signal resources. This dynamic adaptation allows the uplink transmission to adjust to changing channel conditions in different time-frequency regions, improving versatility while maintaining configuration simplicity through systematic association rules.
3Measurement precision
If the uplink reference signal resource is divided into finer first resources, then the channel measurement accuracy improves, but the device complexity increases
Solution Approach 1:
The patent segments the uplink reference signal resource into multiple first resources to improve measurement accuracy. However, it controls the resulting complexity by establishing systematic association rules between first resources and downlink reference signal resources, and by determining precoding matrices through a structured process rather than independent configuration of each parameter.
Solution Approach 2:
The patent manages complexity by introducing a systematic dimensional framework where first resources (time-frequency units) are associated with downlink reference signal resources through defined rules. This structured approach to multi-dimensional resource mapping enables fine-grained measurement while keeping configuration manageable through consistent association patterns rather than arbitrary complex mappings.
Data Source
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AI summary
This application provides an uplink reference signal sending method, an uplink reference signal receiving method, and a communication apparatus, to obtain an accurate measurement result of an uplink channel. The method includes: determining, according to a resource allocation rule, downlink reference signal resources corresponding to a plurality of first resources used to carry an uplink reference signal in a plurality of uplink reference signal resources, where each uplink reference signal resource includes one or more first resources; determining, based on the downlink reference signal resource corresponding to each first resource, a precoding matrix corresponding to each first resource; and then sending a precoded uplink reference signal, where the precoded uplink reference signal is obtained by precoding the uplink reference signal based on the precoding matrix corresponding to each first resource. Subsequently, a precoding matrix corresponding to a second resource used for uplink data transmission may be determined based on a correspondence between the first resource and the precoding matrix. Therefore, the correspondence between the first resource and the precoding matrix corresponds to a correspondence between the second resource and the precoding matrix. This facilitates appropriate scheduling for uplink data transmission.