Positioning SRS Transmission in RRC_INACTIVE With Validity Checks
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Solution Overview
Problem
Existing mobile communication systems face challenges in accurately determining terminal positioning, especially in RRC_INACTIVE state, due to limitations in transmitting sounding reference signals (SRS) and managing assistance data validity, which affects the efficiency and accuracy of positioning services.
Innovation Solution
A method and apparatus for receiving and validating assistance data, selecting a cell, transmitting SRS in RRC_INACTIVE, and stopping SRS transmission upon receiving a specific RRC message, ensuring efficient positioning in RRC_INACTIVE state by managing SRS transmission based on terminal identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is enabled in RRC_INACTIVE state for positioning, then positioning capability is improved, but transmission control complexity increases
Solution Approach 1:
The network configures SRS transmission parameters and validity conditions in advance before the terminal enters RRC_INACTIVE state. The terminal stores these pre-configured parameters and automatically executes transmission based on pre-defined validity conditions (such as assistance data expiration time or cell reselection), eliminating the need for complex real-time control decisions during inactive state.
Solution Approach 2:
The terminal autonomously determines whether to transmit SRS in RRC_INACTIVE state by evaluating pre-configured validity conditions against current status (such as checking if assistance data is still valid or if the current cell matches configured criteria). This self-service mechanism reduces control complexity while maintaining positioning capability.
2Reliability
If assistance data validity management is implemented, then positioning reliability is improved, but signaling overhead increases
Solution Approach 1:
The network provides assistance data validity information (such as expiration time or validity conditions) in advance along with the assistance data itself. The terminal stores this validity information and autonomously determines whether the assistance data remains valid based on pre-defined criteria, eliminating the need for continuous network signaling to verify validity.
Solution Approach 2:
The patent introduces specific validity parameters (such as expiration time, validity conditions, or cell-specific validity flags) attached to assistance data. These parameters transform the assistance data structure to include validity metadata, enabling the terminal to autonomously assess data validity without additional signaling overhead.
3Duration of action of stationary object
If SRS transmission continues in RRC_INACTIVE state, then positioning continuity is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous SRS transmission, the terminal transmits SRS periodically or event-triggered based on pre-configured validity conditions. The transmission occurs only when assistance data is valid and positioning is needed, with automatic suspension when validity conditions are not met, reducing energy consumption while maintaining positioning continuity when required.
Solution Approach 2:
The SRS transmission in RRC_INACTIVE state is made dynamic and conditional rather than static and continuous. The terminal adjusts transmission behavior based on real-time evaluation of pre-configured validity conditions (such as assistance data validity, cell reselection status), enabling positioning continuity only when necessary and reducing energy consumption during unnecessary transmission periods.
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving a first type1 assistance data, receiving a type2 assistance data, determining whether the second type1 assistance data is valid, receiving a RRCRelease, selecting a first cell, transmitting positioning SRS in RRC_INACTIVE, stopping transmission of SRS when a RRC message including a terminal identifier is received in the first cell and transmitting a specific LPP message.