SRS Timer Control Across Cells for Inactive-State Uplink Positioning

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Solution Overview

Problem

Existing wireless communication systems face challenges in supporting uplink positioning for mobile networks, particularly in reducing network energy consumption and maintaining continuous uplink positioning across cell transitions in RRC_INACTIVE state.

Innovation Solution

The solution involves configuring the UE with SRS (Sounding Reference Signal) transmission parameters that are valid across multiple cells, allowing for continuous uplink positioning even when the UE moves between cells, by using TYPE1-I-SRS and TYPE2-I-SRS configurations in RRC_INACTIVE state, which are managed through RRC messages and cell-specific active time settings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the network continuously monitors and manages uplink positioning for each cell transition, then positioning accuracy is maintained, but network energy consumption increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidnetwork energy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by stationary object

Solution Approach 1:

The UE autonomously determines whether to continue or stop TYPE2-I-TAT based on the status of T319 timer without network intervention. The UE self-manages the timer configuration and decision-making process, reducing network monitoring and control overhead while maintaining positioning accuracy through autonomous timer management.

Inventive Principle:

Principle #25Self-service

2Reliability

If the UE maintains continuous SRS transmission across cell transitions, then uplink positioning continuity is ensured, but device energy consumption increases

Engineering Contradiction:

Improvepositioning continuityVSAvoiddevice energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The UE dynamically adjusts SRS transmission behavior based on real-time conditions by monitoring T319 timer status. The transmission continues when positioning is needed (T319 running) and stops when not needed (T319 expired), creating an adaptive energy consumption pattern that maintains positioning reliability while reducing unnecessary energy usage during cell transitions.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If the network configures separate timer management for each cell, then cell-specific positioning accuracy is improved, but system complexity increases

Engineering Contradiction:

Improvecell-specific positioning accuracyVSAvoidtimer management complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

A single TYPE2-I-TAT timer is used to manage uplink positioning across multiple cells simultaneously. The timer provides universal timing control for SRS transmission in both first and second cells, eliminating the need for separate timer configurations per cell while maintaining cell-specific positioning accuracy through the unified timer mechanism.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260052596A1Method and apparatus for managing a specific timer controlling transmission of SRS in one or more cells in mobile wireless communication system

Publication Date: 2026.02.19 BLACKPIN INC

AI summary

A method and apparatus to address the problems of supporting uplink positioning in mobile network is provided. The method of the terminal includes receiving a RRC message including configuration information for TYPE2-I-SRS, starting TYPE2-I-TAT, performing TYPE2-I-SRS transmission based on the configuration information for TYPE2-I-SRS in the first cell or in a second cell, initiating RRC resume procedure in the second cell, transmitting RRCResumeRequest in the second cell, starting T319, and determining whether to stop or continue TYPE2-I-TAT based on status of T319.