LMF On-Demand PRS Request Handling for 5G Positioning
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Solution Overview
Problem
In 5G NR mobile communication technology, network side devices face challenges in efficiently managing on-demand positioning reference signals (PRS) due to varying PRS configuration requests from multiple terminals, leading to situations where the Location Management Function (LMF) device is unable to provide the requested PRS configuration information.
Innovation Solution
A method is introduced where the LMF device receives an on-demand PRS request message from a terminal and sends a response message indicating its inability to provide the requested PRS configuration information. This response may include alternative PRS configuration information or instructions for the terminal to continue using previously obtained PRS configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LMF device provides on-demand PRS configuration information to multiple terminals, then the positioning service availability is improved, but the network resource consumption increases when the LMF cannot fulfill all requests
Solution Approach 1:
The LMF device sends a response message to the terminal indicating whether it can provide the requested PRS configuration information. This feedback mechanism allows the terminal to know the availability status and adjust its behavior accordingly, improving service reliability while avoiding unnecessary resource consumption when services cannot be provided.
Solution Approach 2:
The terminal sends an on-demand PRS configuration request message to the LMF device before actually needing the positioning service. This preliminary action allows the LMF to assess resource availability in advance and prepare appropriate responses, ensuring that when the terminal does need positioning, the configuration is already determined and resources are allocated efficiently.
2Reliability
If the terminal sends on-demand PRS requests frequently to ensure positioning service availability, then the service reliability is improved, but the signaling overhead increases
Solution Approach 1:
The LMF device provides feedback in the response message indicating whether it can fulfill the PRS configuration request. This feedback allows the terminal to understand the network's capacity and avoid sending redundant requests when the LMF cannot provide the service, thereby reducing signaling overhead while maintaining positioning service availability.
Solution Approach 2:
The terminal uses the information from the LMF's response message to determine its next actions autonomously. When the LMF indicates it cannot provide the requested configuration, the terminal can independently decide to use alternative positioning methods or wait for future opportunities, reducing the need for continuous signaling and lowering overall signaling overhead.
3Reliability
If the LMF device processes all PRS configuration requests from terminals, then the positioning service quality is improved, but the processing complexity increases
Solution Approach 1:
The LMF device uses a simplified decision-making process that generates a binary response (can provide or cannot provide the requested configuration). This feedback mechanism reduces processing complexity by avoiding complex negotiations or iterative adjustments, while still maintaining positioning service quality through clear communication of availability status to the terminal.
Data Source
AI summary
A method for requesting an on-demand positioning reference signal (PRS) is performed by a location management function (LMF) device. The method includes: receiving an on-demand PRS requesting message sent by a terminal, the on-demand PRS request message being used for requesting to acquire first PRS configuration information; and in response to determining that the LMF device is unable to provide the first PRS configuration information for the terminal, sending a response message to the terminal.