Network Access Filtering for Reflected Signal Interference
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Solution Overview
Problem
Higher band split nodes in networks cause interference due to reflected signals, leading to signal leakages and interference between devices with different band splits, and existing solutions like installing filters or upgrading all devices are costly and operationally challenging.
Innovation Solution
A network access device (NAD) with RF switches and filters is installed between distribution devices and premises, allowing dynamic adjustment of signal paths to mitigate interference by adding or removing filters based on signal characteristics, reducing the need for on-site service and gradual upgrade of premises devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher band split nodes are deployed to expand upstream bandwidth, then network capacity is improved, but signal interference and reflected signals increase causing leakage between devices with different band splits
Solution Approach 1:
The patent applies local quality by deploying band split nodes with different frequency allocations to different premises based on their specific needs. High-band split nodes serve premises requiring upstream bandwidth expansion, while low-band split nodes serve premises with legacy devices. This localized differentiation allows the network to achieve higher overall productivity while containing interference issues to specific locations where they can be managed through filtering.
Solution Approach 2:
The patent introduces filtering mechanisms as intermediary elements between high-band and low-band split nodes. These filters act as mediators that allow high-band signals to pass through while blocking reflected signals that would otherwise cause interference in low-band devices. This intermediary approach enables coexistence of different band splits without requiring complete network upgrades.
2Object-affected harmful factors
If filters are installed at multiple premises to block signal leakages, then interference is reduced, but operational complexity and service costs increase due to repeated technician visits
Solution Approach 1:
The patent implements self-service through automated filter management systems. The network operations center remotely provisions, configures, and manages filters at customer premises without requiring technician visits. The system automatically detects interference conditions, selects appropriate filter configurations, and deploys them remotely. This transforms a manual, repeat-service model into an automated, self-managing system that reduces operational complexity while maintaining effective interference blocking.
3Productivity
If all devices are upgraded to high-band split nodes, then network performance is improved, but cost and operational challenges increase significantly
Solution Approach 1:
The patent applies partial action by upgrading only specific portions of the network to high-band split nodes where needed, rather than performing a complete network upgrade. High-band nodes are deployed at strategic locations serving premises that require additional upstream bandwidth, while legacy low-band nodes continue to serve premises with existing devices. This partial upgrade approach achieves performance improvements in critical areas without incurring the prohibitive costs of a full network replacement.
Solution Approach 2:
The patent segments the network into multiple band split zones, allowing different portions of the network to operate at different frequency allocations. This segmentation enables gradual, phased upgrades where high-band nodes are introduced in specific segments rather than requiring simultaneous network-wide replacement. Each segment can be independently managed and upgraded based on local requirements and budget constraints.
Data Source
AI summary
A network access device placed between one or more distribution devices and multiple premises may remotely or wirelessly monitor and/or analyze signal characteristics at the network access device and or of equipment at the multiple premises. The network access device may adjust switchably-filtered signal paths between the distribution device(s) and the multiple premises to remove or mitigate signal interference.