Out-of-band Spectrum Channels for Satellite-Terrestrial Interference
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Solution Overview
Problem
Current mobile satellite communication systems face inefficiencies in spectral usage due to interference between satellite and terrestrial communications, limiting the availability of channels for terrestrial data transmissions within the same frequency band.
Innovation Solution
The implementation of out-of-band (OOB) spectrum channels for terrestrial communications, which are outside the satellite transceiver's frequency range, allows for interference-free communication between mobile devices and base stations without affecting satellite operations, thereby increasing spectral efficiency by reusing channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If satellite and terrestrial communications share the same frequency band, then spectral efficiency is improved, but interference between satellite and terrestrial communications increases
Solution Approach 1:
The frequency band is segmented into in-band channels and out-of-band (OOB) channels. In-band channels are used for satellite communications while OOB channels are used for terrestrial communications, allowing both systems to operate simultaneously without interference while utilizing the same overall frequency band structure.
Solution Approach 2:
The system transitions from using only in-band channels to utilizing an additional dimension - out-of-band channels. This expands the available channel space by incorporating frequencies adjacent to the satellite band, effectively increasing spectral efficiency without causing interference to satellite operations.
2Object-affected harmful factors
If out-of-band channels are used for terrestrial communications, then interference with satellite communications is eliminated, but the number of available channels for terrestrial data transmissions is reduced
Solution Approach 1:
The system merges in-band and out-of-band channels into a unified channel allocation strategy. By combining the channel resources from both in-band and out-of-band segments, the system maximizes the total number of available channels for terrestrial communications while ensuring satellite operations remain unaffected.
Solution Approach 2:
The frequency band structure is designed to serve multiple functions: in-band channels support satellite communications, while out-of-band channels support terrestrial communications. This multi-functional approach allows the same frequency spectrum to fulfill both satellite and terrestrial communication needs simultaneously.
3Reliability
If all channels are used for satellite communications, then satellite communication quality is maintained, but terrestrial data transmission capacity is limited
Solution Approach 1:
Out-of-band channels are extracted from the overall frequency band and specifically allocated for terrestrial communications. This extraction allows terrestrial data transmissions to utilize additional channel resources without impacting the in-band channels that carry satellite communications, thereby increasing terrestrial capacity while maintaining satellite quality.
Solution Approach 2:
Out-of-band channels serve as an intermediary resource that enables terrestrial communications to expand capacity without directly competing with satellite communication channels. These intermediate frequency resources act as a buffer zone that allows both systems to coexist and thrive.
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
An apparatus for communicating between a mobile device, and a plurality of transceivers. The apparatus includes a first transceiver which transmits to the mobile device on any one of a plurality of channels. The apparatus further includes a second transceiver which transmits to the mobile device on any one of the plurality of channels.