NTN Connection Timing Using Remaining Satellite Service Time
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Solution Overview
Problem
Existing wireless communication systems for Non-Terrestrial Networks (NTN) face inefficiencies in connection establishment due to the temporary nature of satellite coverage, leading to frequent handovers and increased power consumption during mobile originated or terminated access attempts.
Innovation Solution
A method is provided to determine the remaining time until a satellite or spotbeam coverage is switched, allowing for efficient initiation of mobile originated or terminated connections before handover, using methods based on elevation angle, location, Doppler shift, and network signaling to optimize connection establishment procedures in NTN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection establishment attempts are made continuously in NTN, then connectivity is maintained, but power consumption increases due to frequent handovers and unnecessary connection attempts
Solution Approach 1:
The system performs preliminary determination of handover timing based on elevation angle thresholds and satellite trajectory predictions before actual connection establishment. By calculating the remaining time until handover in advance, the system can pre-identify suitable cells and timing windows, avoiding unnecessary connection attempts after handover occurs and reducing power consumption while maintaining connectivity.
2Reliability
If connection establishment is attempted before handover, then connectivity is established, but time is wasted due to temporary coverage limitations
Solution Approach 1:
The system calculates the remaining time until handover based on current elevation angle and predicted satellite movement before initiating connection establishment. This preliminary timing information allows the system to determine whether connection attempts are likely to succeed, avoiding time-wasting attempts that would fail due to impending handover or temporary coverage loss.
Solution Approach 2:
The system continuously monitors elevation angle and handover timing information, using this feedback to dynamically adjust connection establishment decisions. By comparing real-time elevation data with threshold criteria and handover predictions, the system receives feedback about the suitability of current coverage conditions, allowing it to timing connection attempts optimally to avoid time waste.
3Ease of operation
If cell selection is based on current coverage availability, then immediate access is granted, but power efficiency decreases due to unnecessary connection attempts in temporary coverage
Solution Approach 1:
The system performs preliminary assessment of coverage sustainability by calculating remaining time until handover before granting access. By evaluating whether the current coverage will persist long enough to support a successful connection establishment, the system can make informed cell selection decisions that balance immediate accessibility with power efficiency, avoiding unnecessary connection attempts in temporarily available but unsustainable coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces unnecessary connection attempts, enhances power efficiency, and ensures successful connection establishment before handover, thereby improving device performance in NTN environments.
Implementation Method 1
methods based on elevation angle, location, Doppler shift, and network signaling to optimize connection establishment procedures in NTN
Implementation Method 2
methods based on elevation angle, location, Doppler shift, and network signaling to optimize connection establishment procedures in NTN
Data Source
AI summary
A method performed by a wireless device includes obtaining a remaining service time (Tservice) associated with a first satellite or first spot beam. Based on the remaining service time, the wireless device determines whether to initiate a connection with the first satellite or first spot beam.