Satellite Network UE Registration Timing for Discontinuous Coverage
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Solution Overview
Problem
The movement management and power consumption issues in User Equipment (UE) are not clearly defined in satellite communication systems with discontinuous coverage areas, particularly in 5G systems, where satellite coverage is not continuous.
Innovation Solution
The UE includes a transmission and/or reception unit and a controller that manages communication through a satellite network, using a wait timer to handle registration procedures and emergency calls when satellite coverage is lost, optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs registration procedure immediately when satellite coverage is lost, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The network side performs preliminary action by providing the UE with a wait range parameter before coverage loss occurs. This parameter allows the UE to determine in advance whether to immediately perform registration or wait for a specific time period, thereby avoiding unnecessary registration procedures and reducing power consumption while maintaining communication reliability.
2Use of energy by moving object
If the UE waits for a specific time before registration after satellite coverage loss, then power saving is improved, but emergency response time deteriorates
Solution Approach 1:
The system implements feedback mechanism where the UE monitors whether an emergency call has been made during the wait period. If an emergency call is detected, the UE immediately stops waiting and performs registration procedure without delay. This feedback-based approach allows the system to balance power saving with emergency response requirements dynamically.
3Measurement precision
If the UE continuously monitors satellite coverage status, then movement management accuracy is improved, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system employs periodic action by having the UE monitor coverage status at specific intervals or trigger-based detection. The UE performs registration procedures based on predefined wait ranges and coverage loss conditions, reducing the frequency of monitoring operations while maintaining adequate coverage detection accuracy for movement management.
Data Source
AI summary
A UE capable of performing communication via a satellite receives a wait range via a first satellite from a first PLMN. In a case that the UE becomes able to perform communication via a second satellite connected to the first PLMN after becoming unable to perform communication via the first satellite, the UE selects the first PLMN, generates a wait timer based on the wait range, and starts a timer using the wait timer. In a case that an emergency call is made during the timer running, the UE stops the timer and performs a registration procedure for the emergency call. In a case that an emergency call is not made during the timer running, the UE performs the registration procedure after the timer expires.