Airborne Cellular Networks for Doppler-Compensated IoT Connectivity
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Solution Overview
Problem
Existing cellular communication standards are inadequate for providing reliable wireless data communication in remote areas without fixed infrastructure, particularly for IoT devices with limited power, as they assume unlimited power and stationary locations, lacking solutions for non-terrestrial networks.
Innovation Solution
A method and device for non-terrestrial cellular networks that utilize flight trajectory data and terminal location data to schedule data transmission and reception during available time slots, incorporating power-saving states and Doppler shift compensation, enabling connectivity via airborne or spaceborne base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixed networking infrastructure is deployed in remote areas, then reliable cellular network access is provided, but construction cost and complexity increase significantly
Solution Approach 1:
The patent applies the dynamics principle by transitioning from static ground-based base stations to mobile airborne base stations that can move along predetermined flight trajectories. This allows the network infrastructure to dynamically serve remote areas without requiring permanent construction, reducing infrastructure complexity while maintaining reliable cellular access for IoT devices.
Solution Approach 2:
The patent introduces an intermediary airborne base station that acts as a mobile relay between IoT devices in remote areas and the core network. This intermediary provides cellular network access without requiring direct ground infrastructure deployment, solving the contradiction between reliability and construction complexity.
2Device complexity
If airborne base stations are used to provide network coverage, then infrastructure construction cost is reduced, but Doppler shift and signal stability deteriorate due to relative motion
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing IoT devices with airborne base stations before actual data transmission. The devices determine available time slots based on known flight trajectories and perform synchronization in advance, compensating for Doppler shift effects before they occur. This maintains communication link stability while using mobile infrastructure.
Solution Approach 2:
The patent implements feedback mechanisms where airborne base stations transmit synchronization signals and trajectory information to IoT devices, which then adjust their transmission timing and frequency based on received feedback. This closed-loop control compensates for Doppler shift and maintains reliable communication despite relative motion.
3Reliability
If IoT devices continuously monitor for base station availability, then communication reliability is improved, but power consumption increases for battery-powered devices
Solution Approach 1:
The patent applies periodic action by having IoT devices wake up at predetermined intervals to check for airborne base station availability, rather than continuously monitoring. Devices use known flight trajectories to determine when base stations will be in range and schedule their wake-up times accordingly, reducing power consumption while maintaining communication reliability.
Solution Approach 2:
The patent uses preliminary action by pre-calculating available communication time slots based on published flight trajectories. IoT devices can enter low-power states during periods when no base station will be available, waking up only during predicted communication windows. This reduces power consumption while ensuring reliable connectivity when needed.
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
Enables efficient power management and connectivity for IoT devices by predicting available communication windows and compensating for Doppler shift, allowing connection to global networks without fixed infrastructure.
Implementation Method 1
incorporating power-saving states and Doppler shift compensation
Data Source
AI summary
In an embodiment, a method for estimating a location of a terminal device of a non-terrestrial cellular data communication network, where the non-terrestrial cellular data communication network has one or more airborne or spaceborne base stations moving along a respective flight trajectory and the terminal device, includes the following. At the terminal device, performing a random wake-up and a blind acquisition of a carrier that is made available by a respective one of one or more airborne or spaceborne base stations to attach the terminal device to the non-terrestrial cellular data communication network; and, once the terminal device attaches successfully to the non-terrestrial cellular data communication network via one of the one or more base-stations, estimating terminal location data based on arrival times of at least three reference timing signals received at the terminal device from different positions taken by the one or more airborne or spaceborne base stations.