Aggregating Downlink Positioning Reference Signals
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Solution Overview
Problem
Current wireless networks face challenges in efficiently signaling the aggregation of downlink Positioning Reference Signals (PRS) to user equipment (UE) for improved positioning accuracy, particularly in Industrial Internet-of-Things (IoT) scenarios, where coherent joint processing of multiple PRS resources is necessary but the conditions for such processing are not effectively communicated.
Innovation Solution
The proposed solution involves signaling mechanisms that indicate to the UE whether it can jointly process multiple downlink PRS resources as aggregated resources, based on conditions such as phase coherence, transmission from the same Transmission and Reception Point (TRP), and alignment in frequency layers, allowing the UE to perform coherent joint processing for enhanced positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple DL PRS resources are aggregated and jointly processed, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the joint processing capability by introducing a capability indication mechanism that divides DL PRS resources into aggregatable and non-aggregatable groups. The UE indicates its capability to aggregate N DL PRS resources, and the network configures aggregation accordingly, breaking down the complex joint processing into manageable segments that balance accuracy improvement with device capability constraints.
Solution Approach 2:
The patent implements dynamic aggregation where the number of DL PRS resources to be jointly processed is not fixed but adaptively determined based on UE capability indication and network configuration. The aggregation level can be dynamically adjusted between 1 and N resources, allowing the system to optimize between positioning accuracy and device complexity in real-time based on actual conditions.
2Measurement precision
If coherent joint processing of multiple DL PRS resources is implemented, then time of arrival measurement accuracy is improved, but signaling complexity increases
Solution Approach 1:
The patent extracts the essential coherence conditions from the complex joint processing requirements and communicates only these critical parameters through capability indication and configuration messages. By taking out and signaling only the necessary coherence parameters (such as phase relationship, frequency layer alignment, and TRP identity) rather than all processing details, the patent reduces signaling overhead while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the signaling approach from detailed process description to parameter-based configuration. Instead of signaling complex processing algorithms, the system uses parameter changes (capability indication of N resources, aggregation configuration parameters) to define coherent processing conditions, simplifying the information exchange while preserving the ability to achieve accurate TOA measurements.
3Measurement precision
If DL PRS aggregation is configured without capability indication, then network configuration flexibility is maintained, but positioning performance is suboptimal
Solution Approach 1:
The patent applies preliminary action by having the UE indicate its aggregation capability (N resources) before the network configures the actual DL PRS aggregation. This advance capability declaration allows the network to pre-plan optimal aggregation configurations matched to device capabilities, improving positioning performance from the outset while maintaining configuration flexibility through capability-based matching.
Solution Approach 2:
The patent applies local quality by allowing different aggregation configurations for different UEs based on their individual capabilities. Each UE receives customized aggregation parameters (number of resources, specific resource selections) tailored to its local capability level, enabling optimal positioning performance for each device while the network maintains overall flexibility through capability-based differentiation.
Data Source
AI summary
According to certain embodiments, a method performed by a wireless device comprises receiving an indication from a network. The indication indicates whether the wireless device can jointly process two or more downlink (DL) positioning reference signal (PRS) resources as aggregated DL PRS resources. The method further comprises performing joint processing of the aggregated DL PRS resources to produce a measurement, the joint processing performed based at least in part on the indication indicating that the wireless device can jointly process the two or more downlink DL PRS resources as aggregated DL PRS resources.