Source Reference Signal QCL Constraints for 5G Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing quasi-collocation timing reference signals for positioning reference signals, particularly in 5G networks, which affect the accuracy and efficiency of UE positioning.
Innovation Solution
The solution involves defining constraints on a source reference signal for quasi-collocation timing reference signals, enabling precise alignment of transmit and receive beams for improved signal reception and transmission, using quasi-collocation (QCL) relations to ensure consistent parameters across different beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TCI states are configured for beam indication, then beam flexibility and coverage are improved, but UE complexity in determining and deriving associations increases
Solution Approach 1:
The patent segments the beam indication process by separating the configuration of multiple TCI states from the determination of their associations. The network configures TCI states independently, while the UE derives associations based on predefined rules or additional signaling, reducing the complexity of managing multiple beam associations simultaneously.
Solution Approach 2:
The patent applies preliminary action by pre-configuring TCI states and their associations before actual beam indication is needed. The network provides TCI state configurations and association information in advance through RRC signaling or MAC-CE, so the UE does not need to perform complex real-time derivations during beam switching.
2Reliability
If QCL configurations are derived from multiple TCI states, then downlink data transmission reliability is improved, but processing time and signaling overhead increase
Solution Approach 1:
The patent uses preliminary action by pre-establishing QCL configuration associations between TCI states before data transmission occurs. The network configures these associations through higher-layer signaling in advance, allowing the UE to quickly apply predefined QCL settings during beam switching without performing complex real-time derivations.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network provides explicit association information or simplified derivation rules as intermediaries between TCI states and QCL configurations. This intermediary guidance reduces the UE's processing burden by providing ready-made associations rather than requiring complex autonomous derivation.
3Measurement precision
If beam indication uses multiple TRPs with different QCL configurations, then positioning accuracy is improved, but synchronization and timing alignment become more difficult
Solution Approach 1:
The patent applies local quality by allowing different QCL configurations for different TRPs while maintaining a unified association framework. Each TRP can have its own specific QCL parameters optimized for local conditions, but the UE manages these through a standardized association mechanism that simplifies synchronization across multiple TRPs.
Data Source
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AI summary
Disclosed are techniques related to wireless communications. In an aspect, a network entity determines whether a source reference signal transmitted from a first transmission-reception point (TRP) is a quasi-collocation (QCL) source of a target reference signal transmitted from a second TRP based, at least in part, on a first bandwidth (BW) portion occupied by the source reference signal and a second BW portion occupied by the target reference signal, the first BW portion having a first start frequency and a first BW size and the second BW portion having a second start frequency and a second BW size, and configures a user equipment (UE) with the source reference signal as the QCL source of the target reference signal when it is so determined.