Uplink Time-Frequency Sync Updates for NTN Satellite Orbits
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Solution Overview
Problem
In non-terrestrial network (NTN) communication scenarios, user terminals face challenges in updating uplink time-frequency synchronization parameters in a timely manner, which affects communication quality.
Innovation Solution
A network apparatus configures a parameter for calculating an update period, enabling the terminal apparatus to update uplink time-frequency synchronization parameters at appropriate times, using methods such as segmental linear fitting for complex satellite orbits, and sends these parameters through various messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal uses a fixed update period for uplink time-frequency synchronization parameters, then the terminal operation is simple, but the synchronization accuracy deteriorates when satellite orbits are complex (non-circular)
Solution Approach 1:
The patent applies dynamics by making the update period variable rather than fixed. The network apparatus configures different update periods based on satellite orbit characteristics (circular vs. non-circular), allowing the system to adapt its behavior to match the actual orbital dynamics. This resolves the contradiction by enabling simple operation under circular orbits while achieving high synchronization accuracy under complex non-circular orbits through dynamic parameter adjustment.
Solution Approach 2:
The patent changes the parameter of update period from a fixed value to a configurable variable. The network apparatus determines and configures appropriate update periods based on satellite orbit types, transforming the terminal's operation from using a static parameter to using a dynamically adjusted parameter. This allows the system to optimize synchronization accuracy for different orbital scenarios while maintaining operational simplicity through automated configuration.
2Measurement precision
If the terminal updates synchronization parameters frequently to improve accuracy, then synchronization precision improves, but network signaling overhead increases
Solution Approach 1:
The patent optimizes the update period parameter to balance synchronization accuracy with signaling overhead. By configuring longer update periods for circular orbits (where synchronization changes slowly) and shorter update periods for non-circular orbits (where synchronization changes rapidly), the system achieves accurate synchronization only when necessary, thereby minimizing unnecessary network signaling while maintaining required precision.
Solution Approach 2:
The patent applies partial action by updating synchronization parameters only at appropriate intervals rather than continuously or excessively frequently. The network apparatus determines the minimum necessary update frequency based on orbit characteristics, performing just enough updates to maintain synchronization accuracy without the excessive signaling that would result from more frequent updates.
3Measurement precision
If the network configures different update periods for different satellite orbit types, then synchronization accuracy for complex orbits improves, but system complexity increases
Solution Approach 1:
The patent segments the satellite orbit types into distinct categories (circular and non-circular) with different update period configurations. The network apparatus identifies the satellite's orbit type and applies the appropriate update period configuration for that segment. This segmentation approach improves synchronization accuracy for complex non-circular orbits while managing system complexity through clear classification and standardized configuration rules for each orbit type.
Data Source
AI summary
A terminal apparatus receives a parameter that is configured by a network apparatus and that is used to calculate an update period, where the update period is used to indicate time at which the terminal apparatus receives an uplink time-frequency synchronization parameter. The terminal apparatus receives an updated uplink time-frequency synchronization parameter based on the update period. The network apparatus configures the parameter for calculating the update period, so that the terminal apparatus can update the uplink time-frequency synchronization parameter in time.