HFC Network Full Duplex Transmission via Spectrum Segmentation
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Solution Overview
Problem
The existing Hybrid Fiber Coax (HFC) network faces challenges in supporting the increased bandwidth demands due to the rise of internet video and data services, particularly with the DOCSIS 3.1 standard, which requires a 204 MHz upstream split, while maintaining compatibility with legacy downstream services, leading to difficulties in migrating to Fiber to the Premise (FTTP) architecture.
Innovation Solution
Implementing a mixed HFC/FTTP architecture with Selective Subscriber Shedding, where top-tier subscribers are migrated to FTTP while legacy equipment is supported, using Hybrid Passive Optical Network (HPON) technology to configure customizable splits between upstream and downstream signals, allowing for efficient spectrum utilization and gradual transition to DOCSIS 3.1 services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HFC network uses traditional FDM with 6 MHz blocks for video channels, then legacy downstream services can be maintained, but bandwidth capacity is insufficient to support high-speed data services and internet video
Solution Approach 1:
The patent segments the frequency spectrum into different blocks: traditional 6 MHz video channels remain in the lower frequency range, while new 204 MHz upstream blocks are allocated for high-speed data services. This segmentation allows both legacy video services and modern data services to coexist on the same HFC network without mutual interference.
Solution Approach 2:
The patent introduces a new frequency dimension by allocating 204 MHz upstream blocks above the traditional downstream spectrum. This dimensional expansion allows the network to simultaneously support legacy downstream video services and new upstream data services without requiring complete spectrum reallocation.
2Reliability
If upstream and downstream signals use separate frequency ranges to prevent interference, then signal quality is maintained, but the spectrum split must be continuously adjusted as data services grow
Solution Approach 1:
The patent performs preliminary spectrum allocation by pre-configuring 204 MHz upstream blocks at specific frequency ranges before data services fully deploy. This preliminary action establishes a stable frequency separation framework that accommodates future growth without requiring continuous real-time adjustments.
Solution Approach 2:
The patent implements dynamic spectrum management capabilities that allow the network to flexibly allocate and reallocate frequency blocks based on actual service demand. The system can dynamically adjust which frequency blocks are assigned to video services versus data services while maintaining proper separation to prevent interference.
3Speed
If HFC network infrastructure is upgraded to support DOCSIS 3.1 with 204 MHz upstream split, then high-speed data services can be delivered, but legacy downstream services in the 54-258 MHz range become difficult to support
Solution Approach 1:
The patent segments the frequency spectrum into distinct zones: the 54-258 MHz range is dedicated to legacy downstream video services, while 204 MHz upstream blocks are allocated above this range for high-speed data services. This segmentation creates clear frequency boundaries that allow both legacy and new services to operate simultaneously without interference.
Solution Approach 2:
The patent applies different frequency allocation strategies to different service types: legacy video services continue using traditional downstream frequency blocks with their established infrastructure, while data services utilize the newly allocated upstream frequency blocks. Each service type receives the frequency spectrum optimized for its specific requirements.
Data Source
AI summary
Systems and methods for achieving full duplex bidirectional transmission across coaxial cable in a hybrid fiber-coaxial cable TV network. Some preferred systems and method will attenuate reflections propagated within the coaxial cable. Other preferred systems may echo-cancel reflections propagated within the coaxial cable.