Non-periodic CSI-RS Tracking Configuration via TRS-Info
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Solution Overview
Problem
In New Radio (NR) systems, the lack of Cell-specific Reference Signals (CRS) and lower time domain density of Synchronization Signal Blocks (SSB) lead to performance losses in timing and frequency synchronization, particularly due to random Quasi Co-Located (QCL) configuration of Channel State Information-Reference Signal (CSI-RS) resources, affecting beam usage and channel characteristics.
Innovation Solution
A method and apparatus for configuring CSI-RS resources with a spatial Quasi Co-Location (QCL) parameter, using Tracking Reference Signal-Info (TRS-Info) to ensure quasi co-location of reference signals, thereby improving timing and frequency synchronization performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If SSB is used for synchronization in NR system, then bandwidth occupation is reduced, but time domain density is lower than LTE CRS
Solution Approach 1:
The patent divides the synchronization function into two parts: SSB for coarse synchronization (occupying limited bandwidth) and TRS for fine timing/frequency tracking (providing high time domain density). This segmentation allows each signal to optimize for its specific purpose, resolving the contradiction between bandwidth efficiency and synchronization precision.
2Adaptability or versatility
If QCL information of different CSI-RS resources is configured randomly, then configuration flexibility is improved, but beam consistency deteriorates
Solution Approach 1:
The patent applies local quality by configuring QCL information specifically for TRS resources to ensure spatial consistency and beam alignment, while other CSI-RS resources can maintain random QCL configuration for flexibility. This localized quality control resolves the contradiction by ensuring beam consistency where needed (TRS) while preserving configuration flexibility elsewhere.
3Adaptability or versatility
If different receiving beams are used for different CSI-RS resources, then resource adaptability is improved, but channel statistical characteristics become inconsistent
Solution Approach 1:
The patent ensures that TRS resources use the same receiving beam configuration through consistent QCL information, guaranteeing reliable channel statistical characteristics for tracking purposes. Other CSI-RS resources can continue to use different receiving beams for resource adaptability. This localized quality approach resolves the contradiction between adaptability and reliability.
Data Source
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AI summary
The present application relates to information determination by a terminal device receiving first configuration information transmitted by a network device, the first configuration information being used for configuring a set of non-periodic CSI-RS resources and configuring a first indication parameter corresponding to the set of non-periodic CSI-RS resources, wherein respective non-periodic CSI-RS resources of the set are quasi co-located with respect to a first Quasi Co-Location, QCL, parameter, the first indication parameter is configured to indicate a usage of the set of non-periodic CSI-RS resources, the usage indicates non-periodic CSI-RS for tracking, and the first indication parameter is a parameter Tracking Reference Signal-Info, TRS-Info, and wherein the QCL parameter comprises QCL-TypeA and QCL-TypeD; QCL-TypeA is QCL parameter about Doppler shift, Doppler spread, average delay, and delay spread; QCL-TypeD is QCL parameter about Spatial Rx parameter.