Dynamic PRS Configuration for Positioning Accuracy and Interference Control
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Solution Overview
Problem
The existing LTE positioning reference signals (PRS) are static and cannot be tailored to specific environmental or user-specific needs, leading to interference with neighboring cells and inefficient resource utilization in NR networks.
Innovation Solution
A dynamic configuration method for PRS is implemented, allowing adaptation based on UE movement and beamforming, with feedback loops between the UE and network nodes to optimize PRS characteristics and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static PRS configuration is used in LTE, then implementation is simple and legacy compatibility is maintained, but positioning accuracy is insufficient and interference with neighboring cells occurs
Solution Approach 1:
The patent implements dynamic PRS configuration where the network node adjusts PRS parameters (time resources, frequency resources, power allocation) based on real-time channel conditions and UE positioning requirements. This transforms the static LTE PRS configuration into a dynamic system that adapts to changing environmental conditions, thereby improving positioning accuracy while managing complexity through automated feedback loops.
Solution Approach 2:
The patent changes multiple PRS parameters including time domain configuration (periodicity, offset), frequency domain configuration (bandwidth, subcarrier spacing), and power allocation. By dynamically adjusting these parameters based on channel quality indicators and positioning accuracy requirements, the system resolves the contradiction between maintaining simple implementation and achieving high positioning accuracy.
2Measurement precision
If PRS resources are increased to improve positioning accuracy, then positioning performance improves, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by allocating PRS resources specifically to UEs that require positioning services, rather than uniformly across all cells. The network node determines UE-specific PRS configurations based on individual UE positioning requirements, channel conditions, and service priorities. This localized approach improves positioning accuracy for target UEs while minimizing waste of network resources on UEs that do not require positioning.
Solution Approach 2:
The patent implements partial action by providing PRS resources only when and where needed for positioning, rather than continuously allocating full PRS resources to all cells. The dynamic configuration allows the system to allocate PRS resources partially (reducing overall resource consumption) while still achieving sufficient positioning accuracy for specific UEs based on their individual requirements.
3Measurement precision
If PRS configuration is made UE-specific and beam-specific, then positioning accuracy improves, but configuration complexity and feedback overhead increase
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously measure channel conditions and provide feedback reports about PRS signal quality. The UE-specific PRS configurations are determined based on UE-provided feedback regarding received signal strength, interference levels, and positioning accuracy requirements. This self-service mechanism reduces network-side complexity while achieving high positioning accuracy through distributed intelligence.
Solution Approach 2:
The patent establishes feedback loops where UEs report PRS measurement results and channel conditions to the network node, which then adjusts UE-specific and beam-specific PRS configurations accordingly. This closed-loop feedback system enables the network to optimize positioning accuracy for each UE and beam while managing configuration complexity through iterative refinement based on actual measurement data.
Data Source
AI summary
A method for positioning reference signal configuration comprises receiving, from a network node, one or more first positioning reference signals in a first PRS configuration; performing one or more first measurements on the first PRS to determine one or more first characteristics of the one or more first PRSs; sending, to the network node, a second PRS configuration determined based on the one or more first characteristics; receiving, from the network node, a third PRS configuration, wherein the third PRS configuration comprises one or more third PRSs having at least one different signal characteristic than the one or more first characteristics of the first PRS; and performing one or more second measurements on the one or more third PRSs. The method provides a dynamic configuration for PRS based on the feedback from the UE and a location node, beamforming configuration, or any requirements for physical layer efficiently.