RRC Inactive Positioning Reporting Using SRB2 Small Data
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Solution Overview
Problem
The challenge of reporting positioning measurement results in RRC_INACTIVE state in mobile communication systems, particularly in 5G networks, is not adequately addressed, which is crucial for accurate terminal positioning in IoT and machine-type communications.
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 SuspendConfig with SRB2, enabling efficient reporting of positioning measurements even when the terminal is in a reduced power state.
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 signaling overhead and network complexity increase
Solution Approach 1:
The patent introduces an intermediary mechanism by embedding positioning measurement results within existing RRC messages (RRCRelease, RRCResume, or uplink data transmissions) rather than creating dedicated positioning reporting channels. This mediator approach allows positioning information to be carried through the SuspendConfig and small data transmission procedures, resolving the contradiction by avoiding direct dedicated signaling while maintaining positioning accuracy.
Solution Approach 2:
The patent merges positioning measurement result reporting with existing RRC procedures for inactive state management. By combining positioning reports with RRCRelease, RRCResume, or small data transmissions, the system achieves positioning functionality without adding separate signaling overhead, thus reducing network complexity while preserving measurement precision.
2Use of energy by moving object
If the terminal remains in RRC_INACTIVE state for positioning measurements, then energy consumption is reduced, but positioning result freshness deteriorates
Solution Approach 1:
The patent applies preliminary action by configuring the terminal with positioning measurement parameters and assistance data before transitioning to RRC_INACTIVE state. The network provides type1 and type2 assistance data in advance, enabling the terminal to perform measurements efficiently while inactive, thus maintaining energy savings while ensuring positioning result freshness through pre-configured measurement opportunities.
Solution Approach 2:
The patent implements periodic positioning measurements during RRC_INACTIVE state through configured measurement opportunities. The terminal performs measurements at predetermined intervals or triggers based on configuration, allowing energy-efficient periodic reporting that maintains positioning freshness without requiring continuous active connection.
3Measurement precision
If the terminal transitions to RRC_CONNECTED for positioning reporting, then positioning result accuracy is improved, but latency and energy consumption increase
Solution Approach 1:
The patent uses preliminary action by pre-configuring positioning measurement parameters, assistance data, and reporting triggers while the terminal is in RRC_CONNECTED state before transitioning to inactive. This allows the terminal to report positioning results directly in inactive state when conditions are met, avoiding the latency and energy cost of transitioning to connected state solely for reporting.
4Reliability
If the network provides type2 assistance data with validity information, then positioning reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges type2 assistance data with type1 assistance data in the same RRC message transmission. By combining both data types in a single signaling event rather than separate transmissions, the system improves positioning reliability through comprehensive assistance data provision while minimizing signaling overhead through efficient data consolidation.
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.