Uplink Reference Signal Configuration for Coherent Transmission
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Solution Overview
Problem
In communication systems, the lack of interaction information about coherent transmission capability on transmission chains between User Equipment (UE) and base stations leads to inconsistent uplink transmission performance due to hardware constraints, preventing simultaneous coherent transmission on multiple layers, which affects the scheduling and resource allocation.
Innovation Solution
A method for acquiring and transmitting configuration information about uplink reference signal resources, including coherent transmission capability and relationships among reference signal ports, to ensure coherent transmission performance, involving steps like acquiring configuration info, transmitting reference signals, and receiving indication info for performing uplink transmission based on the interaction between UE and base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station performs uplink scheduling assuming the UE can perform coherent transmission on all transmission chains, then the scheduling performance estimation is optimistic, but the actual uplink transmission performance deteriorates due to hardware constraints
Solution Approach 1:
The UE reports its coherent transmission capability information (such as the number of coherent transmission chains) to the base station. The base station uses this feedback to adjust its scheduling decisions and resource allocation, ensuring that the scheduling performance estimation matches the actual transmission capability, thereby resolving the performance deterioration caused by optimistic assumptions
Solution Approach 2:
The system changes the parameter of transmission capability indication by introducing explicit coherent transmission capability reporting. Instead of assuming full coherent transmission capability, the base station receives actual capability parameters from the UE and adjusts scheduling based on these changed parameters, aligning expectations with reality
2Measurement precision
If multiple uplink reference signal ports are configured for high spatial resolution CSI measurement, then the CSI measurement accuracy improves, but the coherent transmission relationship among ports may be inconsistent with actual hardware capabilities
Solution Approach 1:
The UE reports coherent transmission relationship information among uplink reference signal ports to the base station. This feedback allows the base station to understand which ports can actually transmit coherently based on hardware constraints, enabling accurate CSI measurement configuration that matches physical capabilities
Solution Approach 2:
Different uplink reference signal ports are configured with different coherent transmission relationships based on local hardware capabilities. Instead of assuming all ports have the same coherent transmission property, the system assigns specific coherent transmission relationships to specific ports, matching the actual hardware quality of each transmission chain
Data Source
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AI summary
An uplink transmission method, an uplink transmission configuration method, a UE and a base station are provided. The uplink transmission method applied for the UE includes: acquiring configuration information about one or more uplink reference signal resources configured by the base station for the UE; transmitting one or more uplink reference signals based on the configuration information about the one or more uplink reference signal resources; receiving indication information about uplink transmission determined by the base station; and performing the uplink transmission based on the indication information.