NTN Access Control Using Distance and Doppler Thresholds

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Solution Overview

Problem

In NTN communication systems, the large difference between maximum and minimum communication distances between a terminal device and an aircraft platform results in high power consumption due to the need for large transmit power when the terminal device communicates at maximum distance.

Innovation Solution

The terminal device accesses the access network device only when it is close to the aircraft platform by determining that a preset condition is satisfied based on transmission parameters and reference information, such as channel parameters, Doppler frequency shifts, or distance thresholds, thereby reducing the need for high transmit power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the terminal device communicates with the aircraft platform at maximum communication distance, then the coverage range is extended, but the transmit power increases resulting in high power consumption

Engineering Contradiction:

Improvecoverage rangeVSAvoidpower consumption

Core Design Contradiction:

Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The terminal device changes the parameter of access decision by evaluating transmission parameters (channel quality, distance, signal strength) against thresholds. Instead of continuously accessing at all distances, the device dynamically adjusts access behavior based on measured parameters, allowing coverage extension while avoiding high power consumption at maximum distances where signal quality is poor

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system transitions from a static access approach (always access or never access) to a dynamic approach where the terminal device continuously monitors transmission parameters and adjusts access decisions in real-time. This dynamic adaptation allows the device to access only when conditions are favorable, maintaining coverage capability while minimizing power consumption

Inventive Principle:

Principle #15Dynamics

2Length of stationary object

If the terminal device uses large transmit power to access the access network device at maximum distance, then the communication distance is extended, but the power consumption increases

Engineering Contradiction:

Improvecommunication distanceVSAvoidpower consumption

Core Design Contradiction:

Length of stationary objectVSLoss of energy

Solution Approach 1:

The terminal device performs preliminary evaluation of transmission parameters (channel quality, distance, signal strength) before attempting access. By assessing whether the current conditions meet access thresholds, the device prevents unnecessary access attempts that would consume large amounts of power, thereby counteracting the tendency to continuously use high transmit power to extend communication distance

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If the terminal device accesses the access network device continuously, then the communication reliability is maintained, but the power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The terminal device implements a feedback mechanism by continuously monitoring transmission parameters (channel quality, signal strength, distance) and using this feedback to adjust access decisions. The device compares measured parameters against thresholds and only accesses when conditions indicate successful communication is likely, thereby maintaining reliability through condition-based access rather than continuous access, which would waste power

Inventive Principle:

Principle #23Feedback

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 power consumption by ensuring the terminal device accesses the network only when signal strength is sufficient, minimizing the required transmit power and maintaining low power usage.

Implementation Method 1

The reference information includes one or more of a channel parameter threshold, a Doppler frequency shift threshold, or a distance threshold between the terminal device and the access network device

Methodology Applied

Scientific EffectDoppler frequency shift: Doppler Effect

Data Source

PatentUS12483319B2Access method and device

Publication Date: 2025.11.25 HUAWEI TECH CO LTD

AI summary

Embodiments of this application provide an access method and a device, and relate to the field of communication technologies. A terminal device obtains a transmission parameter between the terminal device and an access network device; and the terminal device accesses the access network device when determining, based on the transmission parameter and reference information, that a preset condition is satisfied. The reference information includes a threshold corresponding to the transmission parameter. Embodiments of this application are used for communication access.