QCL Beam Information Configuration for 5G Channel Estimation
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Solution Overview
Problem
In 5G communications systems, the lack of quasi co-location (QCL) relationship between antenna ports for different beams complicates accurate large-scale channel property estimation, as each beam has unique properties such as delay spread, Doppler spread, and angle of arrival, making existing QCL information configuration methods inadequate.
Innovation Solution
A method and apparatus for sending and receiving QCL beam information between a network device and a terminal, where the network device determines and sends QCL beam information indicating beams with a QCL relationship to the terminal, allowing it to accurately estimate large-scale channel properties by identifying the relevant beam and reference signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If QCL information is configured based on PQI indicator for a same TRP, then all ports for DMRS have QCL relationship, but in 5G system with large-scale array structure and different beams, antenna ports for different beams have different large-scale properties and no QCL relationship exists
Solution Approach 1:
The patent segments the QCL information configuration by introducing beam-specific QCL relationships. Instead of a unified QCL configuration for all antenna ports in a TRP, the patent divides the configuration into multiple QCL relationships, each associated with a specific beam. This allows different beams to have their own QCL parameters (delay spread, Doppler spread, Doppler frequency shift, average delay, AOA, AAS, AOD, ADS, spatial correlation), enabling accurate channel estimation for each beam while adapting to 5G large-scale array structures.
2Measurement precision
If existing QCL information configuration method is used, then configuration is simple, but terminal cannot estimate large-scale property parameter accurately for different beams with unique properties
Solution Approach 1:
The patent adds a new dimension to QCL information configuration by introducing beam identification (beam ID) as an additional parameter. The QCL information is no longer just a flat configuration but is organized in a hierarchical structure where each QCL relationship is associated with a specific beam ID. This dimensional expansion allows the system to distinguish and configure QCL parameters for multiple beams simultaneously, enabling accurate estimation of large-scale properties for each beam while maintaining an organized configuration structure.
3Productivity
If multiple beams with different large-scale properties are used, then system capacity and throughput are improved, but QCL relationship between antenna ports is lost, complicating channel estimation
Solution Approach 1:
The patent applies preliminary action by pre-configuring QCL information for multiple beams before actual data transmission. The network device configures QCL relationships and associates them with beam IDs in advance, allowing the terminal to have ready-to-use channel estimation parameters for each beam. This preliminary configuration reduces the complexity during real-time operation, as the terminal can directly use the pre-configured QCL information corresponding to the active beam without performing complex real-time QCL determination, thereby supporting high system throughput with multiple beams.
Data Source
AI summary
This application discloses a communication method, a communications apparatus, a network device, and a terminal. Quasi co-location QCL beam information is determined. The QCL beam information includes beam information that has a QCL relationship with a reference signal antenna port. The QCL beam information is sent. A terminal receives the QCL beam information. The QCL beam information includes the beam information that has the QCL relationship with the reference signal antenna port. The terminal determines, based on the beam information that is included in the QCL beam information and that has the QCL relationship with the reference signal antenna port, a beam that has the QCL relationship with the reference signal antenna port.