PRS Resource Set Prioritization Across TRPs for UE Positioning
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently processing a large number of positioning reference signal (PRS) resource sets due to limited UE processing capabilities, leading to suboptimal positioning accuracy and efficiency.
Innovation Solution
A method and apparatus that prioritize PRS measurements by selecting and measuring PRS resource sets based on conditions such as highest number of TRPs, bandwidth parts, geometric dilution of precision (GDOP), or sidelink frequency layers, allowing UEs to manage multiple PRS resource sets efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures all PRS resource sets from multiple TRPs, then positioning accuracy is improved, but UE processing complexity increases beyond capability limits
Solution Approach 1:
The patent segments the PRS resource sets into different priority levels (first priority and second priority). The UE is configured to measure high-priority PRS resource sets from multiple TRPs to achieve adequate positioning accuracy, while low-priority resource sets are skipped or measured only when processing capacity allows. This segmentation resolves the contradiction by dividing the measurement task into manageable portions that match UE capabilities.
Solution Approach 2:
The patent changes the parameter of measurement priority assignment based on TRP configurations. By dynamically adjusting which PRS resource sets are measured first based on their priority values, the system optimizes positioning accuracy within UE processing limits. The network can configure priority parameters to reflect the importance of different TRPs for the specific positioning scenario.
2Productivity
If the UE prioritizes measuring PRS resource sets from a single TRP, then processing load is reduced, but positioning accuracy deteriorates due to insufficient spatial diversity
Solution Approach 1:
The patent segments the measurement process into priority-based phases. In the first phase, the UE measures high-priority PRS resource sets from multiple TRPs to establish baseline positioning accuracy. In subsequent phases, if processing capacity permits, the UE can measure additional lower-priority resource sets. This segmented approach ensures spatial diversity is captured while managing processing load efficiently.
Solution Approach 2:
The patent applies partial action by having the UE measure only the necessary subset of PRS resource sets (those with highest priority) rather than all available resource sets. This partial measurement approach achieves adequate positioning accuracy with reduced processing requirements, resolving the contradiction between productivity and measurement precision.
3Speed
If the UE measures multiple PRS resource sets simultaneously, then positioning speed is improved, but processing resources are exceeded
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure priority information for PRS resource sets before the UE performs measurements. The UE uses these pre-assigned priorities to determine the measurement sequence, measuring high-priority resource sets first. This preliminary configuration enables the UE to efficiently allocate processing resources without exceeding capabilities while maintaining positioning speed.
Solution Approach 2:
The patent introduces dynamic measurement scheduling where the UE can adapt its measurement rate based on available processing resources. The UE measures PRS resource sets in priority order, and if processing capacity becomes available, it can accelerate measurements of lower-priority sets. This dynamic approach balances positioning speed with processing resource constraints.
Data Source
AI summary
Aspects presented herein may enable a UE to prioritize frequency layers, TRPs within a frequency layer, PRS resource sets associated with a TRP, and/or PR resources within a PRS resource set based on one or more conditions. In one aspect, a UE receives, from each of a plurality of TRPs, a plurality of PRS resource sets in a PFL. The UE measures a first PRS resource set in the plurality of PRS resource sets from each of the plurality of TRPs before measuring a second PRS resource set in the plurality of PRS resource sets.