Uplink Time-Frequency Correction via Model Parameters
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Solution Overview
Problem
Wireless communication systems, particularly in non-terrestrial networks, face challenges with uplink transmission time and frequency corrections due to high Doppler shifts and misalignments, which affect signal alignment and quality, especially in scenarios like high-speed trains and satellite communications.
Innovation Solution
The implementation of signaling model parameters that indicate time and frequency corrections, allowing user equipment (UE) to autonomously apply these corrections based on received model parameters from the network node, using polynomial formats or table-based configurations, to mitigate misalignments and improve uplink transmission accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional uplink transmission methods are used in non-terrestrial networks, then device complexity is reduced, but time and frequency alignment accuracy deteriorates due to high Doppler shifts and misalignments
Solution Approach 1:
The network node provides model parameters in advance that enable the UE to perform preliminary time and frequency corrections before uplink transmission. The UE uses these parameters to calculate correction values and adjust its transmission timing and frequency, proactively compensating for Doppler effects and misalignments before they degrade signal quality.
Solution Approach 2:
The UE autonomously applies time and frequency corrections using the provided model parameters without requiring continuous network control. The device independently calculates correction values based on the model parameters and its own transmission characteristics, enabling self-service correction that improves accuracy while reducing network signaling overhead.
2Loss of information
If autonomous correction application by UE is implemented, then signaling overhead is reduced, but correction accuracy may worsen due to UE estimation errors
Solution Approach 1:
The network node provides model parameters that characterize the time and frequency correction relationships. The UE uses these parameters to dynamically calculate correction values based on actual transmission conditions. By changing from fixed correction values to model-based dynamic corrections, the system reduces signaling overhead while maintaining accuracy through adaptive calculation.
3Manufacturing precision
If model parameters are provided by network node, then uplink transmission accuracy is improved, but network node complexity increases
Solution Approach 1:
The network node provides model parameters tailored to specific UE characteristics and transmission conditions. Each UE receives customized model parameters that reflect its local situation, such as its position, velocity, and service type. This localized approach improves transmission accuracy for each UE without requiring the network node to manage complex universal correction mechanisms for all devices.
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 enhances the robustness and autonomy of uplink transmission adjustments, reducing signaling overhead and minimizing errors in time and frequency alignment, thereby improving communication quality in challenging environments like non-terrestrial networks.
Implementation Method 1
Wireless communication systems, particularly in non-terrestrial networks, face challenges with uplink transmission time and frequency corrections due to high Doppler shifts and misalignments
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node associated with a non-terrestrial network, an indication of one or more model parameters that indicate one or more of a time correction or a frequency correction. The UE may transmit, to the network node, an uplink transmission based at least in part on the one or more model parameters. Numerous other aspects are described.