Flexible Resource Block Mapping Under mmWave NTN PFD Limits
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Solution Overview
Problem
The imposition of power flux density (PFD) limits in millimeter wave (mmW) non-terrestrial networks (NTN) can result in negative signal-to-noise ratios (SNR) for wireless devices, making it difficult to decode signals reliably, especially in bandwidth-limited scenarios.
Innovation Solution
Implementing a flexible resource block (FRB) configuration that maps a set of activated resource elements (REs) across multiple physical resource blocks (PRBs) to achieve a positive SNR while adhering to PFD limits, using an interlace structure to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power flux density limits are imposed on millimeter wave NTN transmissions, then regulatory compliance is achieved, but signal-to-noise ratio becomes negative making reliable decoding difficult
Solution Approach 1:
The transmission bandwidth is segmented into multiple resource blocks (RBs), each further divided into resource elements (REs). By activating only specific REs within RBs according to the FRB configuration, the patent distributes the transmission power across segmented frequency resources, achieving PFD compliance while maintaining adequate SNR through selective resource utilization.
Solution Approach 2:
The patent introduces a new dimensional approach by mapping resource elements to a three-dimensional structure involving frequency (PRBs), time (slots), and spatial (antenna ports) dimensions. This multi-dimensional resource mapping enables the system to achieve PFD limits in the frequency domain while maintaining signal quality through temporal and spatial diversity.
2Object-affected harmful factors
If bandwidth is reduced to meet PFD limits, then power flux density compliance is achieved, but available transmission capacity decreases
Solution Approach 1:
The FRB configuration enables dynamic allocation of resource elements across frequency and time resources. The system can adaptively activate different RE patterns based on channel conditions, traffic requirements, and PFD constraints, optimizing the trade-off between transmission capacity and regulatory compliance in real-time scenarios.
Solution Approach 2:
The patent utilizes configurable parameters including the number of PRBs, RE positions, antenna ports, and slot structures to optimize transmission. By adjusting these parameters, the system maintains maximum transmission capacity within PFD limits, achieving compliance without sacrificing productivity through intelligent parameter optimization.
3Object-affected harmful factors
If resource elements are distributed across multiple physical resource blocks, then power flux density compliance is achieved, but resource mapping complexity increases
Solution Approach 1:
The patent employs template-based FRB configurations that can be replicated and reused across different time slots and frequency resources. Once a valid FRB pattern is established, it can be copied and applied repeatedly, significantly reducing the complexity of resource mapping while maintaining PFD compliance through consistent structured deployment.
Data Source
AI summary
The apparatus may be a wireless device (e.g., a UE) or a component thereof configured to obtain a flexible resource block (FRB) configuration for a FRB comprising a set of activated resource elements (REs) associated with the FRB configuration in each of a plurality of physical resource blocks (PRBs) and receive, based on the FRB configuration, a transmission via at least one FRB. The apparatus may be a network node (e.g., a satellite or other network device associated with a NTN) or a component thereof configured to transmit a FRB configuration for a FRB comprising a set of activated REs associated with the FRB configuration in each of a plurality of PRBs and transmit, based on the FRB configuration, a transmission via at least the FRB.