UE Doppler Shift Compensation in Non-Terrestrial Networks
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Solution Overview
Problem
Non-terrestrial networks (NTNs) face challenges in compensating for Doppler shift, which affects communication quality due to the movement of satellites and user equipment, leading to frequency shifts that existing technologies struggle to fully correct, especially at higher relative speeds.
Innovation Solution
The method involves user equipment (UE) calculating and transmitting Doppler shift compensation information to network nodes, including frequency shift values and change rates, based on ephemeris information and position data, allowing for pre-compensation and potential additional compensation by network nodes to maintain communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing Doppler shift compensation technologies are used in NTN, then basic communication functionality is maintained, but communication quality deteriorates at higher relative speeds between satellites and user equipment
Solution Approach 1:
The patent applies preliminary action by having the UE calculate and report Doppler shift compensation information (frequency shift value and change rate) in advance based on ephemeris information and position data. The network node then uses this pre-calculated information to perform compensation before communication, enabling effective Doppler correction even at high relative speeds between satellites and user equipment.
2Reliability
If precise Doppler shift compensation is implemented using ephemeris information and position data, then communication quality improves, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the user equipment to autonomously calculate Doppler shift compensation information using ephemeris information and position data from the NTN device. The UE performs the compensation calculations and reports the results to the network node, eliminating the need for complex network-side processing and distributing the computational burden to the UE.
3Reliability
If Doppler shift compensation information is transmitted frequently to maintain accuracy, then communication reliability improves, but information transmission overhead increases
Solution Approach 1:
The patent applies continuity of useful action by establishing an ongoing process where the UE continuously reports Doppler shift compensation information to the network node. This continuous feedback mechanism ensures that compensation remains accurate over time while allowing the network to adapt to changing relative speeds and positions between the satellite and user equipment.
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 effectively compensates for Doppler shifts, improving communication quality by enabling precise frequency adjustments, even in scenarios with high relative speeds between satellites and user equipment, thereby enhancing the reliability of NTN communications.
Implementation Method 1
The NTN device may comprise a satellite that moves based on the ephemeris information
Implementation Method 2
Non-terrestrial networks (NTNs) face challenges in compensating for Doppler shift, which affects communication quality due to the movement of satellites and user equipment, leading to frequency shifts
Data Source
AI summary
A device of a user equipment (UE) includes at least one transceiver and at least one processor coupled to the at least one transceiver. The at least one processor is configured to perform a compensation for doppler shift based on ephemeris information for non-terrestrial network (NTN) device and position information of the UE. The at least one processor is configured to transmit a message including compensation information to a network node through the NTN device based on the compensation. The compensation information indicates at least one of a frequency shift value according to the doppler shift or a doppler shift change rate indicating a change rate of a frequency shift value per unit time. The NTN device includes a satellite that moves based on the ephemeris information.