5G NR Search Space Parameter Determination via SSB-CSI-RS Mapping
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Solution Overview
Problem
In the 5G NR system, there is a lack of an effective scheme for determining parameter information of search space #0 in a control resource set (CORESET #0), which hinders accurate monitoring of search space #0 by terminal devices.
Innovation Solution
The method involves receiving dedicated signaling to configure the TCI state of CORESET #0, determining a target SSB associated with the CSI-RS, and using this association to accurately determine the parameter information of search space #0, ensuring consistent understanding between network-side devices and terminal devices for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hybrid digital-analog beamforming technology is used to reduce device cost and complexity, then device cost and baseband processing complexity are reduced, but the ability to accurately determine search space parameters is lost
Solution Approach 1:
The patent introduces an intermediary mapping relationship between SSB and CSI-RS to bridge the gap caused by hybrid beamforming. The terminal device uses the SSB-CSI-RS association as a mediator to indirectly determine search space parameters, rather than directly obtaining them from the simplified baseband processing system.
Solution Approach 2:
The network side pre-configures the association relationship between SSB and CSI-RS before the terminal device needs to determine search space parameters. This preliminary setup allows the terminal to quickly derive search space parameters without complex real-time baseband processing.
2Device complexity
If hybrid digital-analog beamforming technology is used, then device cost is reduced, but search space #0 monitoring accuracy deteriorates
Solution Approach 1:
The SSB-CSI-RS association serves as a reliable intermediary that preserves search space monitoring reliability despite the simplified hybrid beamforming architecture. The terminal device leverages this pre-established association to accurately identify search space #0 parameters.
Solution Approach 2:
The network side performs preliminary configuration of the SSB-CSI-RS mapping relationship, ensuring that search space #0 can be reliably determined before the terminal device begins monitoring operations.
3Device complexity
If no SSB-CSI-RS association scheme is provided, then system simplicity is maintained, but parameter information determination becomes impossible
Solution Approach 1:
The network side performs preliminary configuration of the SSB-CSI-RS association relationship, ensuring that parameter information is available when needed without adding complex real-time processing requirements to the terminal device.
Data Source
AI summary
Embodiments of this disclosure disclose a method for determining a search space parameter and a terminal device. The method includes: receiving dedicated signaling, where the dedicated signaling is used to configure a TCI state of a CORESET #0 for the terminal device, and a Source RS indicated by the TCI state of the CORESET #0 is a CSI-RS; determining a target SSB having a first association relationship with the CSI-RS; and determining parameter information of a search space #0 in the CORESET #0 based on the target SSB.