RRC Inactive Positioning Reports Using Validated NR Assistance Data
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently reporting positioning measurement results in the RRC_INACTIVE state, which is crucial for terminal positioning in IoT networks and machine communications, due to the lack of effective assistance data delivery and measurement reporting mechanisms.
Innovation Solution
The solution involves receiving type 1 and type 2 assistance data from a base station, determining validity based on NR Cell Global identity, and transmitting positioning measurement results in RRC_INACTIVE state using a first message, with support for small data transmission on Signaling Radio Bearer 2 (SRB2) to facilitate accurate positioning measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal transmits positioning measurement results in RRC_INACTIVE state, then positioning accuracy is improved, but device complexity increases due to additional assistance data management and validity determination mechanisms
Solution Approach 1:
The assistance data is segmented into type1 (immediate use) and type2 (conditional use with validity criteria), allowing the terminal to manage positioning data in structured chunks rather than as a single complex dataset, thereby reducing management overhead while maintaining accuracy
Solution Approach 2:
The base station performs preliminary actions by pre-configuring assistance data and validity criteria before the terminal needs positioning measurements, so the terminal receives ready-to-use type1 data and pre-validated type2 data with clear validity conditions, reducing real-time processing complexity
2Reliability
If the base station delivers both type1 and type2 assistance data with validity information, then positioning reliability is improved, but loss of information increases due to additional data transmission overhead
Solution Approach 1:
The assistance data structure is designed with multi-functionality to serve both immediate positioning needs (type1) and conditional positioning scenarios (type2), allowing a single data delivery mechanism to handle multiple positioning cases without requiring separate information channels, thus reducing overall overhead
Solution Approach 2:
The base station provides copied or reference information through type1 assistance data that can be immediately used, while type2 data provides alternative or supplementary information with validity criteria, allowing the terminal to use lightweight references rather than transmitting complete duplicate datasets
3Measurement precision
If the terminal determines validity of type2 assistance data using NR Cell Global identity, then positioning accuracy is improved, but productivity decreases due to additional validation processing time
Solution Approach 1:
The terminal performs self-service validation by autonomously determining the validity of type2 assistance data using its own NR Cell Global identity comparison, without requiring external verification from the base station or network, thereby maintaining accuracy while reducing overall system processing overhead and improving efficiency
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving from a base station a first type1 assistance data including a type1 identifier and one or more PRS resource set information, receiving from a base station a type2 assistance data including a validity information and a second type1 assistance data, determining based on the validity information and New Radio (NR) Cell Global identity of serving cell whether the second type1 assistance data is valid, receiving from the base station a RRCRelease including a SuspendConfig including a information indicating small data transmission is configured for Signaling Radio Bearer2 (SRB2), transmitting in RRC_INACTIVE a first message.