Base Station Frequency Adaptation for TV Interference Mitigation
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Solution Overview
Problem
The reallocation of frequency channels in the UHF spectrum for mobile communication systems can cause interference with terrestrial television broadcasts, as mobile radio communication signals may overlap with frequencies used by television receivers, leading to reduced quality of television content reception.
Innovation Solution
A method is introduced where mobile communication base stations adapt their transmission by identifying the channel map of a particular television region to selectively limit or block specific frequency sub-channels, thereby reducing interference with television signals while maintaining mobile communication signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency channels are reallocated for mobile communication systems, then mobile communication capacity is improved, but interference with terrestrial television broadcasts increases
Solution Approach 1:
The base station applies different transmission strategies to different frequency sub-channels based on local conditions (television channel map). Specifically, it identifies which sub-channels correspond to television broadcast frequencies and applies interference mitigation only to those specific sub-channels, while maintaining full transmission capacity on non-television sub-channels. This localized approach resolves the contradiction by making the system's interference characteristics spatially and spectrally non-uniform.
Solution Approach 2:
The base station dynamically changes transmission parameters (power level, modulation scheme, or complete suppression) for specific frequency sub-channels based on the identified television channel map. When a sub-channel is detected to overlap with television broadcast frequencies, the base station adjusts its transmission parameters for that sub-channel to reduce interference, while maintaining normal operation on other sub-channels. This parameter adaptation resolves the contradiction between maintaining mobile communication capacity and reducing television interference.
2Object-affected harmful factors
If mobile radio communication signals are completely suppressed to eliminate interference, then television reception quality is improved, but mobile communication service is degraded
Solution Approach 1:
The base station segments the frequency spectrum into television broadcast sub-channels and non-television sub-channels based on the channel map. It then applies different transmission strategies to each segment: interference mitigation on television sub-channels and normal transmission on non-television sub-channels. This segmentation resolves the contradiction by ensuring that mobile communication service continues uninterrupted on available frequencies while protecting television reception on designated frequencies.
Solution Approach 2:
Instead of completely suppressing mobile radio communication signals across the entire frequency band, the base station applies partial action by selectively mitigating interference only on sub-channels that overlap with television broadcast frequencies. This partial approach maintains mobile communication service quality on non-television sub-channels while providing sufficient interference protection on television sub-channels, thus resolving the contradiction between the two opposing goals.
3Object-affected harmful factors
If base station adapts transmission based on channel map, then interference reduction is achieved, but system complexity increases
Solution Approach 1:
The base station performs preliminary identification of the television channel map and pre-determines which frequency sub-channels may cause interference before actual transmission begins. This advance preparation allows the base station to have a clear understanding of which sub-channels require interference mitigation, simplifying the real-time transmission control process. The preliminary action of channel map identification and sub-channel classification resolves the complexity issue by establishing a fixed reference framework before dynamic transmission adjustments are made.
Solution Approach 2:
The base station uses the identified channel map as feedback information to continuously adjust its transmission strategy. By monitoring which sub-channels correspond to television broadcast frequencies and adapting transmission parameters accordingly, the base station creates a closed-loop control system. This feedback mechanism resolves the complexity issue by providing a systematic, automated approach to interference mitigation that does not require complex real-time analysis during transmission.
Data Source
AI summary
A method of reducing interference to reception of streams of television content received at a television receiver in which each of the streams of television content are transmitted on one of a plurality of frequency channels in accordance with a channel map which defines on which of the plurality of frequency channels each stream of television content is transmitted and the interference being caused by a base station transmitting data to or receiving data from one or more mobile devices via radio communication signals in a vicinity of the television receiver. The method includes identifying the channel map and adapting a transmission of the radio communication signals between the base station and the one or more of mobile devices in accordance with the identified channel map to reduce interference at the television receiver.