5G Positioning in RRC_INACTIVE State via Pre-configured Assistance Data
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Solution Overview
Problem
Current 5G communication systems face challenges in accurately determining terminal positioning, especially in IoT networks, where existing methods are inefficient in providing precise location information using uplink and downlink reference signals, particularly in RRC_INACTIVE states.
Innovation Solution
The proposed solution involves a method and apparatus for receiving SIB1, acquiring SI, transmitting provideCapabilities, requesting and receiving ProvideAssistanceData, determining PRS validity, and transmitting positioning SRS in RRC_INACTIVE states, along with providing LocationInformation, which includes first and second capability information related to PRS and SRS in RRC_INACTIVE states, to enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning is performed using uplink and downlink reference signals in 5G systems, then positioning capability is provided, but positioning accuracy is insufficient especially in RRC_INACTIVE states
Solution Approach 1:
The network pre-configures positioning reference signals (PRS) and assistance data before the terminal enters RRC_INACTIVE state. The terminal stores this positioning configuration information in its context, enabling it to perform positioning measurements autonomously while inactive, thus achieving both accuracy and adaptability
Solution Approach 2:
Assistance data acts as an intermediary between the network and terminal for positioning. The assistance data contains pre-calculated reference signal information from multiple base stations, which the terminal uses to perform accurate positioning measurements without requiring continuous network connection or real-time signal processing
2Measurement precision
If positioning assistance data is continuously provided to terminals, then positioning accuracy is improved, but network signaling overhead and complexity increase
Solution Approach 1:
The patent extracts only the essential positioning assistance data (PRS configuration, base station information, timing parameters) needed for positioning and separates it from other network signaling. This extracted positioning information is provided independently to terminals, reducing overall signaling complexity while maintaining positioning accuracy
Solution Approach 2:
Positioning assistance data is pre-configured and provided to terminals before positioning is needed. The network performs positioning configuration in advance during connected state, and terminals store this data for use during RRC_INACTIVE state, eliminating the need for continuous data provision and reducing signaling overhead
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving a SIB1, acquiring the SI, transmitting a provideCapabilities, transmitting a RequestAssistanceData, receiving a ProvideAssistanceData, determining a validity of the PRS, receiving a RRCRelease, transmitting a positioning SRS in RRC_INACTIVE state and transmitting and a ProvideLocationInformation in RRC_INACTIVE state. The provideCapabilities includes a first capability information related to PRS in RRC_INACTIVE and a second capability information related to SRS in RRC_INACTIVE.