Sub-band Transpose Repeater for Wireless Coverage
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Solution Overview
Problem
Conventional cellular repeaters face limitations such as self-oscillation, limited gain, and noise interference due to amplifying full carrier bandwidths, which degrade network performance and restrict coverage extension in wireless networks.
Innovation Solution
The implementation of sub-band signal repetition through frequency shifting, where only the utilized sub-band is amplified and transmitted, reducing self-interference by shifting the signal to a different frequency offset, and using bandpass filters to suppress noise in unused sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional repeaters amplify full carrier bandwidth, then coverage extension is provided, but self-oscillation and noise interference occur
Solution Approach 1:
The patent divides the full carrier bandwidth into multiple sub-bands and selectively amplifies only the sub-band containing the desired signal. This segmentation approach allows the repeater to avoid amplifying noise in other sub-bands, thereby reducing noise interference and self-oscillation while maintaining coverage extension capability.
Solution Approach 2:
The patent applies different processing qualities to different frequency sub-bands. The sub-band containing the desired signal receives amplification, while other sub-bands are filtered out. This local quality differentiation ensures that useful signal is enhanced while harmful noise and self-oscillation are suppressed.
2Area of stationary object
If full carrier bandwidth is amplified, then signal coverage is extended, but gain is limited due to power distribution across all sub-bands
Solution Approach 1:
By segmenting the bandwidth and selecting only the relevant sub-band for amplification, the available power can be concentrated on the desired signal rather than being distributed across all sub-bands. This increases the effective gain for the amplified signal while maintaining coverage extension.
Solution Approach 2:
The patent changes the frequency domain parameters by identifying and selecting specific sub-bands for amplification based on signal detection. This parameter selection allows optimal power allocation to enhance gain for the desired signal while avoiding power waste on noise-containing sub-bands.
3Area of stationary object
If full bandwidth is transmitted, then complete signal coverage is achieved, but noise in unused sub-bands degrades network performance
Solution Approach 1:
The patent extracts and amplifies only the sub-band containing the desired signal, taking it out from the full carrier bandwidth. The unused sub-bands with noise are left unamplified and can be filtered out, thereby extracting the useful signal while leaving behind the harmful noise components.
Solution Approach 2:
Different quality processing is applied to different sub-bands: the desired sub-band receives amplification while unused sub-bands are suppressed. This local quality approach ensures that noise in inactive sub-bands does not degrade network performance while maintaining complete signal coverage in the active sub-band.
Data Source
AI summary
In accordance with example embodiments of the invention there is at least an apparatus and a method to perform determining, by a network node, a repeater, and/or a user equipment of a communication network, a configuration message comprising an identified frequency range of at least one of a first communication link between a donor and a repeater or a second communication link between a user equipment and the repeater for a repeat transmission in the communication network; and communicating with at least one of the repeater or the user equipment an indication of the configuration message for configuration at the repeater and the user equipment of the at least one set of sub-carriers mapped with the at least one physical channel for the repeat transmission, wherein the configuration message is using at least a different frequency offset of supported radio frequency resources to map at least one set of sub-carriers of the at least one of the first communication link and the second communication link with at least one physical channel in supported radio frequency resources of at least one of the first communication link or the second communication link, and mapping comprises performing spectral modification of resources to cause at least one of: sub-carrier shifting, wherein a sub-carrier is selected for the repeater to frequency shift to another part of the spectrum, based on instructions by the network node, sub-carrier inversion, wherein sub-carriers' indices are inversed, based on an on/off decision by the network node, and wherein the spectral modification is causing the at least one set of sub-carriers with the at least one physical channel to have different spectral properties as compared to a target set of sub-carriers associated with at least one of the user equipment or the repeater.