Terrestrial-Satellite Traffic Offloading for Interference-Aware Handover
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Solution Overview
Problem
Co-channel and adjacent channel interference in heterogeneous terrestrial and satellite networks degrade Signal to Interference and Noise Ratio (SINR), affecting spectral efficiency and end-user experience when terrestrial and satellite cells operate on the same frequency band.
Innovation Solution
Implement traffic management techniques that include mechanisms to offload traffic from terrestrial cells to satellite cells by instructing user equipment to perform handovers or cell reselection, using algorithms that consider satellite trajectory, terrestrial RAN utilization, frequency band configurations, and UE capabilities to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite cells and terrestrial cells operate on the same frequency band to provide additional coverage and capacity, then network coverage and service capacity are improved, but co-channel interference and adjacent channel interference occur which degrade SINR and spectral efficiency
Solution Approach 1:
The patent implements dynamic frequency band adjustment where satellite cells can be mandated to change frequency bands based on real-time terrestrial cell operations. The system dynamically assigns frequency bands to satellite cells to avoid interference with terrestrial cells, allowing the network to adapt frequency allocation continuously as satellites move and terrestrial traffic patterns change.
Solution Approach 2:
The system changes the frequency band parameter of satellite cells dynamically. When interference is detected or predicted, the network controller mandates satellite cells to switch to different frequency bands, thereby changing the operating parameters to eliminate harmful interference while maintaining coverage and capacity benefits.
2Productivity
If satellite cells are used to provide additional service capacity during busy hours, then network capacity and user experience are improved, but frequency band conflicts with terrestrial cells degrade SINR and spectral efficiency
Solution Approach 1:
The system performs preliminary frequency band assignment and trajectory scheduling for satellite cells before they provide service. The network controller pre-coordinates frequency bands between satellite and terrestrial cells based on predicted satellite positions and terrestrial traffic patterns, preventing interference before it occurs rather than reacting to it.
Solution Approach 2:
The system implements continuous monitoring of terrestrial cell frequency band usage and satellite cell positions. Based on this feedback, the network controller dynamically adjusts satellite cell frequency bands in real-time to maintain optimal SINR and spectral efficiency while providing additional service capacity during high-demand periods.
3Adaptability or versatility
If satellite trajectory is adjusted to orbit over congested terrestrial RAN areas during busy times, then traffic offloading capability is improved, but co-channel interference with terrestrial cells increases which degrades network performance
Solution Approach 1:
The system enables satellite cells to serve multiple functions: providing coverage in remote areas, adding capacity in congested urban areas, and enabling traffic offloading from terrestrial networks. By making satellite cells multi-functional and dynamically assignable to different geographic areas and frequency bands, the system maximizes their utility while managing interference through coordinated frequency assignment.
Data Source
AI summary
Aspects of the subject disclosure may include, for example, obtaining first data associated with a plurality of user equipment devices that are communicating with at least one access point of a wireless terrestrial network, wherein the first data indicates a respective location of each user equipment device, a respective in-use wireless frequency that each user equipment device is using for communicating with the at least one access point, and one or more respective potential wireless frequencies that each user equipment device is capable of using for wireless communication; obtaining second data associated with a satellite access point of a wireless non-terrestrial network, wherein the second data indicates a current location of the satellite access point, a future predicted location of the satellite access point, and one or more wireless satellite frequencies that will be available for use by the satellite access point when at the future predicted location in order to communicate with one or more of the user equipment devices; and selecting, based upon the first and second data, at least one user equipment device of the plurality of user equipment devices to offload its data communication to the satellite access point. Other embodiments are disclosed.