Dynamic Amplifier Bandwidth for Blanked PRB Interference Mitigation
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Solution Overview
Problem
Residual energy transmission within blanked Physical Resource Blocks (PRBs) in communication networks causes interference and degrades service quality, affecting both the intended network and adjacent frequency bands due to spectral leakage, sidelobes from modulation techniques, and nonlinearity of power amplifiers.
Innovation Solution
Implementing a dynamic amplifier system that adjusts its operational bandwidth in real-time based on PRB allocation, selectively amplifying frequencies corresponding to non-blanked PRBs while excluding blanked PRBs, using a scheduler and controller to manage this adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRB blanking is implemented to mitigate interference, then network performance is improved, but residual energy transmission on blanked PRBs causes harmful interference
Solution Approach 1:
The patent applies dynamics by making the amplifier's operational bandwidth adjustable in real-time. The controller dynamically configures the amplifier to operate only on non-blanked PRB frequencies, allowing the system to adapt its bandwidth based on current transmission requirements and eliminate residual energy on blanked PRBs
Solution Approach 2:
The patent changes the operational parameter of the amplifier from a fixed bandwidth to a dynamically adjustable bandwidth. By modifying the amplifier's operational characteristics based on scheduling information, the system can selectively amplify only desired frequencies and suppress residual energy transmission
2Device complexity
If a fixed bandwidth amplifier is used, then device complexity is reduced, but residual energy on blanked PRBs cannot be mitigated
Solution Approach 1:
The patent introduces a controller as an intermediary between the scheduler and the amplifier. This controller receives scheduling information and configures the amplifier's operational bandwidth accordingly, enabling the amplifier to mitigate residual energy without requiring complex internal modifications to the amplifier itself
3Object-generated harmful factors
If the amplifier operational bandwidth is dynamically adjusted to exclude blanked PRBs, then residual energy transmission is reduced, but system complexity increases
Solution Approach 1:
The patent makes the amplifier multi-functional by enabling it to operate in different bandwidth configurations based on network needs. The same amplifier can serve both wideband and narrowband operations, as well as selectively amplify specific frequency ranges, eliminating the need for multiple dedicated amplifiers
Data Source
AI summary
Embodiments of the present disclosure are directed to systems and methods for mitigating energy transmitted on subcarriers in a communications network. For example, an operational bandwidth of an amplifier may be adjusted in real-time based on the network’s current needs. A controller may communicate with a scheduler to identify which range of frequencies within an input signal received at the amplifier contain blanked PRBs and which contain active PRBs. The amplifier may then selectively amplify only the active PRB frequencies and exclude the blanked PRBs, thereby reducing residual energy transmission and interference typically caused when blanked PRBs are amplified.