Doppler-Corrected Terrestrial–Satellite Spectrum Sharing
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in spectrum utilization due to interference between terrestrial and non-terrestrial apparatuses, particularly with low Earth orbit satellites, as they have short transmission times and require separate spectrum allocation, limiting peak rates and spectrum sharing without commercial cooperation.
Innovation Solution
Implementing Doppler shift correction to identify and block physical resource blocks (PRBs) used by terrestrial apparatuses to avoid interference with satellite signals, using geospatial techniques and frequency correction factors to dynamically adjust transmission frequencies based on satellite movement and overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate spectrum allocation is used for terrestrial and non-terrestrial apparatuses, then interference is avoided, but spectrum utilization efficiency deteriorates
Solution Approach 1:
The patent merges terrestrial and non-terrestrial spectrum resources by implementing a unified spectrum sharing mechanism. The network determines overlap between terrestrial cell coverage and non-terrestrial apparatus coverage, then dynamically adjusts terrestrial resource allocation to avoid interference with non-terrestrial transmissions while maximizing spectrum utilization. This combines previously separate spectrum allocations into a coordinated shared system.
Solution Approach 2:
The patent implements dynamic spectrum allocation where the network continuously monitors and determines coverage overlap between terrestrial and non-terrestrial apparatuses. Based on real-time overlap determination, the network dynamically adjusts terrestrial resource allocation, activating or deactivating specific resource blocks as non-terrestrial apparatuses move in and out of coverage areas. This dynamic adjustment optimizes spectrum utilization while preventing interference.
2Productivity
If spectrum sharing between terrestrial and non-terrestrial apparatuses is implemented, then spectrum utilization efficiency is improved, but interference control complexity increases
Solution Approach 1:
The patent introduces a network entity as an intermediary that centralizes the interference management function. This intermediary receives coverage information from both terrestrial base stations and non-terrestrial apparatuses, determines overlap regions, and coordinates resource allocation decisions. By centralizing control in an intermediary entity, the system manages interference complexity centrally rather than requiring complex distributed coordination between all network elements.
Solution Approach 2:
The patent implements a self-service mechanism where the network automatically determines coverage overlap and performs dynamic resource allocation without requiring manual configuration or external intervention. The system autonomously monitors non-terrestrial apparatus coverage, identifies interference-prone resource blocks, and adjusts terrestrial allocations accordingly. This self-service approach reduces operational complexity while enabling efficient spectrum sharing.
3Reliability
If terrestrial access network nodes continuously monitor non-terrestrial apparatus coverage, then interference is avoided, but signaling overhead increases
Solution Approach 1:
The patent implements preliminary action by having non-terrestrial apparatuses proactively report their coverage information to the network in advance. Instead of continuous monitoring requests from terrestrial nodes, the system uses pre-reported coverage data to predict and prevent potential interference. The network uses this advance information to pre-allocate resources and configure interference avoidance measures before interference occurs, reducing the need for continuous signaling.
Solution Approach 2:
The patent implements periodic action where non-terrestrial apparatuses report coverage information at regular intervals rather than continuously. The network uses these periodic updates to adjust terrestrial resource allocation accordingly. This periodic reporting mechanism maintains reliable interference avoidance while significantly reducing signaling overhead compared to continuous monitoring, as the system only needs to react to periodic coverage changes.
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 spectrum sharing between terrestrial and non-terrestrial apparatuses without requiring cooperation, avoiding interference and optimizing frequency spectrum utilization.
Implementation Method 1
determining a first Doppler shift correction value, the first Doppler shift correction value corresponding to a frequency shift resulting from a relative velocity difference between the non-terrestrial apparatus and the terrestrial access network node
Data Source
AI summary
There is provided a method, computer program and apparatus for causing an apparatus to perform: determining that a first non-terrestrial apparatus coverage area provided by a non-terrestrial apparatus will at least partially overlap with a first access coverage area provided by a terrestrial access network node at and/or during a first time; determining a first Doppler shift correction value, the first Doppler shift correction value corresponding to a frequency shift resulting from a relative velocity difference between the non-terrestrial apparatus and the terrestrial access network node at and/or during the first time; determining at least one first shifted non-terrestrial apparatus frequency by correcting at least one transmission and/or reception frequency of the non-terrestrial apparatus using the first Doppler shift correction value; and causing the terrestrial access network node to abstain from transmitting and/or receiving signalling on resources corresponding to the at least one first shifted non-terrestrial apparatus frequency.