Regenerative Active Distributed Networks for HFC Capacity
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Solution Overview
Problem
Current DOCSIS implementations face limitations in capacity due to their contention-based bus architecture, and upgrading HFC networks to support increased bandwidth is economically impractical due to the high cost of replacing amplifiers and taps, while fiber deployments are cost-prohibitive for overlaying existing networks.
Innovation Solution
The implementation of regenerative technology that allows for grouping data channels by type and modulating them at specific frequencies, using a regeneration device with a mapping engine, upstream filters, demodulators, and modulators to reconfigure and re-modulate data streams, enabling independent spectrum planning and hardware simplification, and allowing for the use of commercial off-the-shelf hardware in the cloud.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HFC networks use traditional amplifiers and passive taps, then the network can cover large areas, but the capacity is limited and upgrading is economically impractical
Solution Approach 1:
The patent changes the fundamental parameters of network nodes by replacing passive amplifiers and taps with active regenerative nodes that perform signal regeneration, filtering, and channel aggregation. This transforms the network from a passive distribution system to an active intelligent system, enabling capacity upgrades without physical infrastructure replacement
Solution Approach 2:
The patent substitutes mechanical/passive signal amplification with electronic/digital signal processing. Regenerative nodes use digital signal processing, filtering, and modulation techniques to regenerate and retransmit signals, replacing the purely mechanical amplifier/tap architecture with intelligent electronic systems
2Productivity
If DOCSIS uses contention-based bus architecture, then the network can be simple to deploy, but the system capacity is limited
Solution Approach 1:
The patent segments the monolithic contention-based bus into multiple independent data channels, each handled by dedicated upstream modulators and filters. This divides the single large contention domain into smaller manageable channels, increasing overall system capacity while maintaining operational simplicity through modular architecture
Solution Approach 2:
The patent adds frequency dimension to the network architecture by implementing spectral maps with multiple frequency channels. Instead of single-dimensional time-division multiplexing, the system uses multi-dimensional frequency-time channelization, allowing parallel data transmission across multiple spectral channels
3Productivity
If fiber is deployed to increase bandwidth, then bandwidth capacity increases significantly, but the cost is prohibitive for overlaying existing networks
Solution Approach 1:
The patent changes the operational parameters of existing coaxial infrastructure by introducing regenerative nodes that actively process and regenerate signals. This extends the usable bandwidth and performance of legacy coax networks without requiring physical fiber replacement, achieving fiber-like capacity on copper infrastructure
4Speed
If regenerative technology is implemented, then network performance is upgraded and latency is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple functions (filtering, demodulation, signal regeneration, remodulation, and retransmission) into integrated regenerative nodes. By combining these previously separate functions into unified intelligent nodes, the system achieves high performance while managing complexity through functional integration rather than separate discrete components
Data Source
AI summary
A mapping engine is configured to rearrange a configuration of data on a plurality of data channels. Each of a set of upstream filters is configured to pass one or more selected input radio frequency signals. An input of each of a set of upstream demodulators is configurable to be coupled to a selected one of the upstream filters and an output of each upstream demodulator is coupled to the mapping engine. An input of each of a set of upstream modulators is coupled to the mapping engine. An upstream aggregator comprises one or more inputs and is configured to aggregate a plurality of upstream-bound radio frequency signals, each input being configurable to be coupled to at least one selected upstream filter of the set of upstream filters and a selected upstream modulator.