PRS Configuration and Measurement Gaps for Low-Latency UE Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing positioning reference signals (PRS) for accurate UE location determination, particularly in dense configurations, leading to increased latency and reduced spectral efficiency.
Innovation Solution
The implementation of optimized PRS configurations with reduced periodicity and frequency hopping, along with enhanced measurement gap requests and configurations, to improve UE location estimation accuracy and reduce latency in 5G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning reference signals are configured with higher density for accurate UE location determination, then positioning accuracy is improved, but spectral efficiency deteriorates and latency increases
Solution Approach 1:
The patent implements dynamic PRS configuration where the network can adjust PRS periodicity and density based on UE mobility state, service type, and positioning accuracy requirements. Mobile UEs receive less frequent PRS while stationary UEs receive more frequent PRS, optimizing spectral efficiency while maintaining necessary positioning accuracy for different scenarios
Solution Approach 2:
The patent applies different PRS configuration parameters to different UEs or different geographic regions based on local requirements. High-accuracy positioning areas receive denser PRS configurations, while areas with lower requirements use sparser configurations, thereby optimizing overall spectral efficiency while maintaining local positioning accuracy
2Measurement precision
If positioning reference signals are transmitted with higher density for accurate UE location determination, then positioning accuracy is improved, but latency increases
Solution Approach 1:
The patent implements dynamic adjustment of PRS periodicity based on UE mobility and service requirements. For low-latency services or stationary UEs where high accuracy is needed, PRS frequency is increased. For mobile U or services tolerating higher latency, PRS frequency is reduced, thereby optimizing the trade-off between positioning accuracy and latency
Solution Approach 2:
The patent enables UE to request dedicated measurement gaps in advance for positioning measurements. The network configures these gaps proactively based on UE capabilities and service requirements, allowing UEs to perform positioning measurements during pre-allocated gaps without impacting ongoing data transmissions, thus reducing measurement latency
3Measurement precision
If dedicated measurement gaps are configured for positioning measurements, then positioning accuracy is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent implements measurement gaps on demand rather than continuously. UEs request dedicated measurement gaps only when positioning measurements are needed, and the network allocates gaps selectively based on service requirements. This partial allocation approach ensures positioning accuracy when needed while minimizing impact on data transmission efficiency during normal operation
Solution Approach 2:
The patent dynamically adjusts measurement gap configuration based on real-time service requirements, UE mobility state, and network conditions. When low-latency data transmission is priority, measurement gaps are reduced or eliminated. When positioning accuracy becomes critical, measurement gaps are activated or increased, optimizing the dynamic trade-off between positioning and data transmission
Data Source
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AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives, from a network entity, a positioning reference signal (PRS) configuration indicating a pattern of PRS resources transmitted by at least one network node, and transmits a proposed measurement gap pattern to a serving network node, the proposed measurement gap pattern enabling the UE to measure at least a subset of PRS resources transmitted by each of the at least one network node, the proposed measurement gap pattern determined based on the pattern of PRS resources.