Positioning SRS Transmission in RRC_INACTIVE Supplementary Uplink
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Solution Overview
Problem
Existing mobile communication systems face challenges in accurately determining terminal positioning, particularly in RRC_INACTIVE state, due to the lack of efficient methods for transmitting sounding reference signals (SRS) and managing assistance data validity in 5G networks.
Innovation Solution
A method and apparatus for receiving first and second type assistance data, determining validity, and transmitting SRS in RRC_INACTIVE state, with mechanisms to stop SRS transmission upon receiving specific RRC messages, ensuring accurate positioning through optimized SRS management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is continuously performed in RRC_INACTIVE state for positioning, then positioning accuracy is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent changes the state parameter of the terminal from RRC_CONNECTED to RRC_INACTIVE, allowing SRS transmission to continue with reduced complexity. The network configures SRS parameters including spatial relation info, pathloss reference, and resource allocation that remain valid during the inactive state, enabling positioning measurements without full connection overhead
Solution Approach 2:
The patent implements dynamic SRS transmission control where the terminal can transition between RRC_CONNECTED and RRC_INACTIVE states while maintaining positioning capability. The network can dynamically update SRS configurations through RRCRelease messages with suspended configurations, allowing flexible adaptation to positioning needs without permanent connection
2Productivity
If assistance data is stored and reused in RRC_INACTIVE state, then positioning efficiency is improved, but reliability deteriorates due to potential data invalidity
Solution Approach 1:
The patent applies preliminary action by configuring SRS parameters and assistance data in advance during RRC_CONNECTED state before transitioning to RRC_INACTIVE. The network provides RRCRelease messages containing suspended SRS configurations and assistance data that the terminal stores and uses immediately upon entering inactive state, eliminating the need for real-time configuration retrieval
Solution Approach 2:
The patent implements feedback mechanisms where the terminal monitors the validity of stored assistance data and SRS configurations. When data expires or becomes invalid, the terminal can trigger RRC connection resumption to receive updated configurations, ensuring reliability while maintaining efficiency during the inactive period
3Use of energy by moving object
If SRS transmission is stopped upon receiving RRC message with terminal identifier, then energy consumption is reduced, but positioning continuity may be affected
Solution Approach 1:
The patent implements periodic SRS transmission in RRC_INACTIVE state rather than continuous transmission. The terminal transmits SRS at configured periodic intervals using stored configurations, consuming less energy than continuous transmission while maintaining positioning capability. The network can resume continuous monitoring by triggering RRC connection restoration when positioning is needed
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.