Dynamic SMTC Configuration for NTN Synchronization
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Solution Overview
Problem
In Non-Terrestrial Networks (NTNs), the existing Synchronization Signal Block Measurement Time Configuration (SMTC) is inadequate to handle the varying propagation delays and Doppler shifts caused by satellite movements, leading to missed reference signals and inefficient measurement processes.
Innovation Solution
A method where wireless devices and network nodes dynamically adapt the SMTC configuration based on location and ephemeris data, allowing for accurate timing and frequency synchronization, and implicitly configure measurement gaps to align with the arrival times of reference signals from neighboring satellites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing SMTC configuration is used in NTN, then device complexity is reduced, but measurement precision deteriorates due to varying propagation delays and Doppler shifts
Solution Approach 1:
The patent applies dynamics by making the SMTC configuration adaptive rather than static. The network node dynamically adjusts the SMTC window timing and duration based on satellite ephemeris data, propagation delay variations, and Doppler shift predictions. This allows the measurement configuration to continuously adapt to changing satellite positions and signal conditions, maintaining measurement precision without requiring overly complex manual configuration
Solution Approach 2:
The patent implements feedback mechanisms where the network node monitors satellite position data, propagation delays, and measurement outcomes to continuously optimize SMTC configuration. The system uses feedback from ephemeris data and actual signal arrival times to adjust future measurement window timing, creating a closed-loop system that improves measurement accuracy while managing complexity through automated adjustment
2Reliability
If measurement gaps are extended to cover varying propagation delays, then measurement reliability improves, but loss of time increases due to longer measurement gaps
Solution Approach 1:
The patent dynamically adjusts measurement gap duration and timing based on predicted propagation delay variations and satellite motion. Rather than using fixed extended gaps, the system calculates optimal gap windows that precisely cover the expected signal arrival time range, ensuring reliability while minimizing time loss through adaptive timing alignment
Solution Approach 2:
The network node performs preliminary calculations using satellite ephemeris data to predict future signal arrival times and propagation delays. By pre-configuring measurement gaps based on these predictions, the system ensures gaps are positioned and sized correctly in advance, maintaining reliability without requiring excessive gap duration
3Adaptability or versatility
If SMTC windows are adjusted for satellite motion, then adaptability improves, but device complexity increases due to dynamic configuration requirements
Solution Approach 1:
The patent uses feedback from satellite ephemeris data and network node calculations to automate SMTC configuration adjustments. The network node receives satellite position information, computes the impact on signal timing and frequency, and automatically updates SMTC parameters accordingly, reducing the adaptability burden on user equipment while maintaining high adaptability to satellite motion
Solution Approach 2:
The network node acts as an intermediary that processes complex satellite motion data and translates it into simplified configuration parameters for user equipment. Rather than requiring devices to directly handle raw ephemeris data and perform complex calculations, the network node pre-processes this information and provides adjusted SMTC configurations, reducing device complexity while maintaining adaptability
4Measurement precision
If measurement processes are optimized for terrestrial networks, then productivity is high, but measurement precision deteriorates in NTN due to propagation delay variations
Solution Approach 1:
The patent applies local quality by customizing measurement configuration parameters specifically for NTN conditions rather than using generic terrestrial network settings. The system adjusts SMTC window timing, duration, and positioning based on local satellite-specific factors such as orbital position, propagation delay, and Doppler characteristics, ensuring measurement precision is optimized for each satellite connection while maintaining efficient measurement processes
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 ensures accurate SMTC windows and measurement gaps, enabling continuous and efficient measurement of reference signals from multiple satellites, even with varying propagation delays and Doppler shifts, improving the reliability and efficiency of communication in NTN scenarios.
Implementation Method 1
varying propagation delays and Doppler shifts caused by satellite movements
Data Source
AI summary
A method (1000) performed by a wireless device (110) includes obtaining (1002) location information associated with the wireless device and/or ephemeris data for a plurality of satellite cells. The wireless device receives (1004) a measurement configuration to measure reference signals from one or more satellite cells of the plurality of satellite cells. The wireless device dynamically adapts (1006) the measurement configuration based on the location of the wireless device and/or the ephemeris data for the one or more satellite cells. Based on the adapted measurement configuration, the wireless device measures (1008) a reference signal from the one or more satellite cells.