PON DOCSIS Upstream Proxy for HFC Network Scalability
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Solution Overview
Problem
Current Hybrid Fiber-Coaxial (HFC) networks face limitations in extending video and data services to a large number of users due to their P2P topology, which increases deployment and operational costs and restricts bandwidth usage, making it difficult to support a greater quantity of end-users efficiently.
Innovation Solution
The implementation of a Passive Optical Network (PON) DOCSIS upstream proxy architecture with a point-to-multipoint (P2MP) topology, utilizing wavelength division multiplexing and DOCSIS protocol for upstream scheduling, allows for efficient extension of services to more users by optimizing bandwidth and reducing costs through a unified access network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If P2P topology is used in HFC network, then service extension to users is limited, but deployment and operational costs increase
Solution Approach 1:
The patent merges PON P2MP topology with HFC P2P topology to create a hybrid network architecture. The PON ODN provides passive optical distribution to multiple users, while HFC components (CMTS, DOCSIS protocol) handle active data communication. This combination allows cost-effective extension to more users by leveraging the passive infrastructure of PON while maintaining the reliable active connectivity of HFC.
Solution Approach 2:
The hybrid network enables a single infrastructure to serve multiple functions: the PON ODN handles video distribution and user access, while the HFC layer handles data communication and billing. The CMTS acts as both an optical terminal and a data communication device, consolidating multiple functions into unified equipment to reduce overall system complexity and cost.
2Quantity of substance
If P2P topology is used, then bandwidth usage is restricted, but the ability to support more users is limited
Solution Approach 1:
The patent segments the network into two distinct topological layers: PON P2MP topology for optical distribution and HFC P2P topology for data communication. This segmentation allows each layer to optimize for its specific function - the P2MP layer efficiently serves multiple users simultaneously while the P2P layer ensures dedicated bandwidth for each user's data needs.
Solution Approach 2:
The invention transitions from a single-dimensional P2P connectivity model to a two-dimensional hybrid architecture where P2MP optical distribution combines with P2P data communication. This dimensional expansion enables the network to scale to more users without proportionally increasing bandwidth costs, as the passive optical layer provides efficient multi-user access.
3Quantity of substance
If traditional HFC network is used, then service extension is limited, but deployment costs are high
Solution Approach 1:
The patent introduces PON technology as an intermediary between the existing HFC network and the end users. The PON ODN acts as a passive intermediary that expands network coverage to more users without requiring active infrastructure deployment in every user location, significantly reducing deployment costs while maintaining service quality.
Solution Approach 2:
The hybrid architecture embeds HFC components within the PON structure - the CMTS is nested within the PON optical network unit, and DOCSIS protocol operations are nested within the PON time-division multiplexing framework. This nesting allows the system to leverage existing HFC investments while adding PON capabilities, reducing overall deployment costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the HFC network to support a significantly larger number of users while reducing deployment and operational costs, providing scalable RF return and better bandwidth usage, allowing for combined residential and business services on a single platform.
Implementation Method 1
utilizing wavelength division multiplexing and DOCSIS protocol for upstream scheduling
Implementation Method 2
The optical transmitter converts the electrical signal to an optically modulated signal before sending the signal downstream to the ON via a fiber optic cable
Implementation Method 3
The ON comprises an optical receiver, which converts the received optical signal from the headend to an electrical signal
Implementation Method 4
The reverse/return transmitter converts electrical signals from the customers into an optical signal, which is then forwarded upstream to the headend
Data Source
AI summary
An apparatus comprising a wavelength division multiplexer (WDM), an optical network unit (ONU) coupled to the WDM, a passive optical network (PON) data over cable service interface specification (DOCSIS) upstream proxy (PDUP) coupled to the ONU and configured to couple to a coaxial cable, and a downstream (DS) optical/electrical (O/E) converter coupled to the WDM and configured to couple to the coaxial cable. An apparatus comprising a WDM, an optical line terminal (OLT) coupled to the WDM, a cable model termination system (CMTS) coupled to the OLT via an upstream external physical (PHY) interface (UEPI), and a DOCSIS and a Quadrature Amplitude Modulation (QAM) unit coupled to the WDM and the CMTS.