Downlink PRS Positioning Using UE Channel Feedback
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Solution Overview
Problem
The Third Generation Partnership Project (3GPP) New Radio (NR) standard does not support User Equipment (UE) to provide Downlink (DL) channel information to the Location Management Function (LMF) at the beginning of the positioning process, leading to inefficient use of time-frequency resources and increased power consumption due to UE attempting to measure undetectable DL Positioning Reference Signals (PRS).
Innovation Solution
The UE sends DL channel information to a core network device, which determines approximate location information and optimally provides DL PRS resource information to the UE, allowing the UE to measure only detectable PRS, thereby reducing resource waste and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE attempts to measure all DL PRS without channel information filtering, then the positioning process can be completed, but time-frequency resources are wasted and power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the UE report DL channel information (such as reference signal received power, signal-to-interference ratio, or channel state information) before the actual positioning measurement. The LMF uses this pre-reported channel information to filter and select only the measurable DL PRS resources, preventing the UE from attempting to measure undetectable signals in advance
Solution Approach 2:
The patent implements feedback by establishing a communication loop where the UE reports its DL channel information to the LMF, which then uses this feedback to determine the appropriate DL PRS resources for measurement. This feedback mechanism ensures that the UE only measures PRS resources that are actually detectable given its current channel conditions
2Adaptability or versatility
If the UE measures all configured DL PRS resources, then positioning coverage is maximized, but time-frequency resources are inefficiently used
Solution Approach 1:
The patent applies local quality by tailoring the DL PRS resource selection to the UE's specific local channel conditions. Instead of uniformly measuring all PRS resources, the system adjusts the measurement configuration based on the UE's reported channel information, selecting only those PRS resources that are locally measurable and relevant to the UE's position and channel characteristics
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the DL PRS resource configuration based on channel condition parameters. The LMF modifies the set of measurable PRS resources according to parameters such as reference signal received power thresholds, signal-to-interference ratio, or channel state information, optimizing the balance between coverage and resource efficiency
3Device complexity
If DL channel information is not provided to the LMF, then the positioning protocol remains simple, but positioning accuracy and efficiency deteriorate
Solution Approach 1:
The patent applies universality by designing a multi-functional positioning protocol where the DL channel information reporting mechanism serves multiple purposes: it enables efficient PRS resource selection, improves measurement accuracy, and provides the LMF with insights into network coverage conditions. This universal approach consolidates multiple functions into a single integrated process rather than adding separate mechanisms
Data Source
AI summary
A method for positioning based on downlink (DL) channel information includes: sending a positioning assistance data request message to a core network device, in which the positioning assistance data request message includes the DL channel information; receiving positioning assistance data sent by the core network device, in which the positioning assistance data includes DL PRS resource information, the DL PRS resource information is determined by an access network device based on first estimated location information of the UE forwarded by the core network device, and the first estimated location information is determined by the core network device based on the DL channel information; obtaining a DL positioning measurement by measuring a DL PRS based on the DL PRS resource information, and sending the DL positioning measurement to the core network device.