Uplink Precoding via SRS-CSI-RS Mapping in 5G Wireless Systems
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Solution Overview
Problem
There is a demand for effectively transmitting and receiving uplink reference signals or channels in wireless communication systems to ensure smooth service provision, particularly in 5G communication systems operating in super-high frequency bands.
Innovation Solution
A method where a user equipment receives information configuring sounding reference signal (SRS) resources related to a channel state information-reference signal (CSI-RS) resource from a base station, obtains precoding information for the uplink channel based on implicit precoding indicated for the uplink channel, and transmits the uplink channel to the base station using the precoding information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If beamforming and massive MIMO are used to reduce path loss in super-high frequency bands, then propagation distance and data rate are improved, but system complexity and device complexity increase
Solution Approach 1:
The patent segments the uplink channel transmission into multiple SRS resources associated with different CSI-RS resources, allowing the system to manage complexity by dividing the beamforming process into manageable segments corresponding to different channel states and beam configurations
Solution Approach 2:
The patent performs preliminary channel state information measurement using CSI-RS resources before actual uplink transmission, allowing the system to pre-determine appropriate beamforming configurations and precoding information, thereby reducing real-time processing complexity
2Measurement precision
If multiple SRS resources are configured for different CSI-RS resources, then channel state information accuracy is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent makes a single uplink channel transmission serve multiple functions by associating it with multiple SRS resources that are in turn associated with multiple CSI-RS resources, allowing one transmission to provide channel state information for multiple downlink channel measurements
Solution Approach 2:
The patent merges multiple SRS resources and their associated CSI-RS resources into a unified uplink channel transmission process, where a single precoding operation handles multiple channel state information requirements simultaneously
Data Source
AI summary
The disclosure relates to a wireless communication system, in which a method performed by a user equipment includes receiving, from a base station, information configuring a plurality of sounding reference signal (SRS) resources that are related with one channel state information-reference signal (CSI-RS) resource, receiving an SRS resource indicator (SRI) indicating at least one SRS resource from among the plurality of SRS resources, obtaining, based on an implicit precoding being indicated for an uplink channel, precoding information for the uplink channel based on the CSI-RS resource related with a most recently transmitted SRS of the at least one SRS resource indicated by the SRI, and transmitting, to the base station, the uplink channel based on the precoding information.