5G Positioning Reference Signal QCL Configuration
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Solution Overview
Problem
In 5G and new radio systems, the complexity of receiving positioning reference signals through beam sweeping is high due to the large number of beams supported by base stations and terminal devices, leading to increased overhead and resource consumption.
Innovation Solution
Configuring quasi-co-location (QCL) relationships between positioning reference signals and other reference signals, allowing terminal devices to determine receive beams based on provided configuration information, thereby reducing the need for extensive beam sweeping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam sweeping is used for receiving positioning reference signals, then the terminal device can receive signals from multiple beams, but the complexity and overhead increase significantly
Solution Approach 1:
The network device pre-configures QCL relationship information between positioning reference signals and reference signals before the terminal device performs beam reception. This preliminary configuration allows the terminal to determine receive beams without extensive beam sweeping, reducing complexity while maintaining reliable signal reception from multiple beams
Solution Approach 2:
The QCL relationship information acts as an intermediary that bridges the positioning reference signal and the reference signal. By using this intermediary information, the terminal device can infer spatial parameters from the reference signal to receive the positioning reference signal, avoiding direct beam sweeping for each positioning signal
2Adaptability or versatility
If a large quantity of beams are supported by base station and terminal device, then beamforming capability is enhanced, but overhead and resource consumption increase
Solution Approach 1:
The QCL relationship configuration enables a single reference signal to serve multiple purposes: it not only provides channel state information but also spatial information for receiving positioning reference signals. This multi-functionality allows the system to support multiple beams without proportionally increasing overhead, as the same reference signal configuration serves both CSI and positioning purposes
Data Source
AI summary
A signal transmission method includes: a terminal device receives configuration information of a positioning reference signal and configuration information of a first reference signal that are from a first network device and that are sent by a serving base station, where the first reference signal and the positioning reference signal are quasi-co-located (QCLed); the terminal device determines, based on the configuration information of the positioning reference signal and the configuration information of the first reference signal, whether a second reference signal corresponding to the first reference signal exists; and if determining that the second reference signal exists, the terminal device receives the positioning reference signal sent by the first network device, where the positioning reference signal and the second reference signal are QCLed.