Tracking Area Update Using UE Boundary Information in NTN
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN), frequent tracking area updates (TAU) and registration area updates (RAU) are unnecessary due to satellite movement, leading to increased signaling overhead and energy consumption, and potential paging failures due to missed system information updates.
Innovation Solution
User Equipment (UE) reports auxiliary information including location and movement information to determine boundary conditions, enabling the core network to send TA indication information for timely tracking area updates, reducing unnecessary updates and improving paging success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent tracking area updates are performed in NTN environments, then the network can maintain accurate location tracking, but signaling overhead and energy consumption increase
Solution Approach 1:
The patent changes the parameter of update frequency based on satellite orbital characteristics. Instead of using fixed terrestrial network update intervals, the system adjusts tracking area update timing to match satellite movement patterns, reducing unnecessary updates while maintaining accurate location tracking throughout the orbital period
Solution Approach 2:
The patent implements periodic tracking area updates synchronized with satellite orbital periods. Updates are performed at specific intervals corresponding to satellite positions, eliminating continuous or frequent updates and reducing energy consumption while maintaining reliable location tracking
2Reliability
If frequent tracking area updates are performed in NTN environments, then the network can maintain accurate location tracking, but signaling overhead increases
Solution Approach 1:
The patent modifies the update interval parameter to align with satellite orbital characteristics, reducing the number of tracking area update signaling events while ensuring location accuracy is maintained through strategically timed updates
Solution Approach 2:
The system employs periodic updates at satellite-orbit-synchronized intervals, reducing signaling overhead by eliminating redundant updates that would occur with terrestrial network timing while maintaining reliable location tracking
3Use of energy by moving object
If system information updates are missed in NTN environments, then device power consumption is reduced, but paging success rates decrease
Solution Approach 1:
The patent adjusts the system information update timing parameter to match satellite orbital periods, ensuring updates occur at optimal moments when satellites are in position to be received, thereby maintaining paging success rates while minimizing unnecessary power consumption from continuous monitoring
Solution Approach 2:
The system implements periodic system information updates synchronized with satellite passages, allowing devices to enter low-power states between updates while ensuring critical paging information is received at predictable intervals, balancing power consumption with paging reliability
Data Source
AI summary
A tracking-area update method, performed by UE, and including: reporting auxiliary information, the auxiliary information includes location information and movement information of the UE; the auxiliary information is configured to determine whether the UE is located in a boundary of two Tracking Areas by a core network.