NTN Positioning SRS Transmission With Validity Timers in RRC Inactive State
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing positioning sounding reference signals (SRS) for accurate positioning in non-terrestrial networks (NTN), particularly in the RRC inactive state, due to the lack of effective configuration and timing mechanisms.
Innovation Solution
The implementation of a validity timer for NTN configuration parameters and SRS configuration in the RRC inactive state, allowing for the transmission of positioning SRS, ensures accurate and timely SRS positioning by maintaining valid configuration settings during the inactive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning SRS transmission is enabled in RRC inactive state, then positioning accuracy is improved, but device complexity increases due to additional configuration management
Solution Approach 1:
The network pre-configures positioning SRS parameters and validity timer values before the UE enters RRC inactive state. This preliminary configuration allows the UE to autonomously manage positioning SRS transmissions during inactive state without complex real-time negotiations, resolving the contradiction by preparing configuration in advance.
Solution Approach 2:
The UE autonomously determines whether to transmit positioning SRS based on the validity timer status and stored configuration parameters during RRC inactive state. This self-service mechanism eliminates the need for continuous network control, reducing configuration management complexity while maintaining positioning accuracy.
2Loss of time
If validity timer is implemented for NTN configuration, then positioning timing accuracy is improved, but device complexity increases due to timer management
Solution Approach 1:
The validity timer provides periodic validation of positioning SRS configuration, automatically expiring and requiring reconfiguration after a predetermined duration. This periodic mechanism ensures timing accuracy by preventing use of stale configurations while simplifying management through automatic expiration rather than continuous monitoring.
Solution Approach 2:
The validity timer creates temporary, short-lived configuration validity periods that automatically expire. This disposable approach to configuration validity simplifies timer management by using simple countdown mechanisms rather than complex state tracking, while maintaining timing accuracy through controlled expiration.
3Productivity
If SRS configuration is maintained during RRC inactive state, then positioning efficiency is improved, but network resource management becomes more complex
Solution Approach 1:
The RRC inactive state configuration is enhanced to simultaneously support both regular communication and positioning functions. By making the inactive state configuration multi-functional, the system maintains positioning SRS transmissions without requiring separate dedicated positioning states, improving efficiency while managing complexity through unified configuration management.
Solution Approach 2:
When the validity timer expires or positioning is no longer needed, the positioning SRS configuration is discarded and the UE returns to standard inactive state behavior. This discarding and recovering mechanism allows efficient positioning when needed while simplifying network resource management by automatically releasing positioning resources when not required.
Data Source
AI summary
A method can include receiving, by a wireless device, one or more radio resource control (RRC) messages. The messages can include one or more non-terrestrial network (NTN) configuration parameters indicating a validity timer. The validity timer can indicate a maximum time duration for which the one or more NTN configuration parameters are valid. The messages can also include one or more positioning sounding reference signal (SRS) configuration parameters indicating at least one positioning SRS resource for SRS positioning in an RRC inactive state of the wireless device. The method can also include starting the validity timer in response to the receiving the one or more NTN configuration parameters. The method can further include, based on the validity timer running in the RRC inactive state, transmitting, in the RRC inactive state, a positioning SRS via the at least one positioning SRS resource.