QoS Mapping Agent for DOCSIS to PON Protocol Translation
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Solution Overview
Problem
The existing hybrid fiber coaxial (HFC) network struggles to handle high-bandwidth traffic demands for high-definition video services, limiting the capacity for DOCSIS communication signals, and there is a need to transition to passive optical networks (PON) while minimizing equipment investment and maintaining compatibility with existing head-end equipment.
Innovation Solution
A system and method that utilizes an optical line terminal (OLT) and optical network units (ONUs) to transport DOCSIS signals over a mixed PON/HFC network, employing a Quality of Service (QoS) Mapping Function (QMF) agent within the Cable Modem Termination System (CMTS) to translate and convert DOCSIS data for compatibility with PON protocols, allowing existing equipment to be used for both HFC and PON networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HFC network is used to carry DOCSIS traffic, then existing equipment can be utilized, but the bandwidth capacity is limited and cannot meet HD video service demands
Solution Approach 1:
The patent introduces a protocol conversion mechanism that acts as an intermediary between DOCSIS and PON protocols. The CMTS receives DOCSIS packets and converts them into PON-compatible format (GEM frames with appropriate mapping), enabling seamless transmission over PON infrastructure without requiring changes to existing DOCSIS equipment or protocols.
Solution Approach 2:
The patent changes the transmission parameters by converting DOCSIS protocol parameters into PON protocol parameters. This includes mapping DOCSIS MAC addresses and packet structures into PON GEM frame structures, allowing the same data traffic to be transmitted over different network infrastructures with different protocol requirements.
2Quantity of substance
If PON network is adopted to increase bandwidth capacity, then HD video service demands can be met, but equipment investment increases and compatibility with existing head-end equipment decreases
Solution Approach 1:
The patent makes the CMTS equipment universal by enabling it to handle both traditional HFC DOCSIS traffic and converted PON traffic through the same interface. The protocol conversion mechanism allows existing head-end equipment to serve dual purposes, reducing the need for separate PON-specific equipment and minimizing overall equipment investment.
Solution Approach 2:
The protocol conversion mechanism serves as an intermediary layer that allows existing DOCSIS equipment to communicate with PON infrastructure. This mediator enables legacy equipment to continue functioning while providing access to PON's higher bandwidth capabilities, avoiding the need for complete equipment replacement.
3Adaptability or versatility
If protocol conversion is implemented to enable DOCSIS over PON, then equipment compatibility is maintained, but system complexity increases
Solution Approach 1:
The patent extracts the protocol conversion function into a dedicated mechanism within the CMTS, separating it from the core DOCSIS processing logic. This modular approach confines the complexity to a specific conversion layer, making the overall system more manageable and maintainable while preserving equipment compatibility.
Data Source
AI summary
A translation agent adapts DOCSIS information, primarily QoS information, for transmission over a PON. The agent places into an IP address field of a DHCP message the MAC address of an ONU associated with a CPE device attempting to register with a CMTS. The translation agent intercepts DHCP reply messages from the DHCP server using the MAC address of the ONU. The translation agent extracts information, including an IP address of the client CPE assigned by the DHCP server. The agent downloads a configuration file for the CPE device using the configuration filename and configuration file server contained in a DHCP reply message. Information contained in the configuration file is converted from content in a format used by DOCSIS, to content in a format used by PON devices. The translated content includes QoS parameters, functions related to which are controlled at the ONU by an OLT coupled to the CMTS.