Remote PHY Device Segment Routing Integration
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Solution Overview
Problem
Cable modem networks face challenges in integrating segment routing with existing DOCSIS systems, particularly in supporting high-bandwidth digital fiber infrastructure, as traditional DOCSIS standards are not naturally applicable for digital fiber and lack the necessary hardware for segment routing processing.
Innovation Solution
The implementation of a remote physical device (RPD) that receives pseudowire control packets with segment routing information, allowing for the establishment of data sessions over a packet-switched network, and uses a new type of segment called PW Segment to bind forwarding behavior to an attachment circuit, enabling seamless operation of DEPI over L2TPv3 directly over Segment Routing for both MPLS and IPv6 networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional DOCSIS systems are used, then compatibility with existing cable modem infrastructure is maintained, but the ability to support digital fiber infrastructure and segment routing is limited
Solution Approach 1:
The patent introduces a Remote PHY Device (RPD) as an intermediary component that bridges traditional DOCSIS systems and digital fiber infrastructure. The RPD includes a DOCSIS MAC layer that interfaces with existing cable modem infrastructure while also supporting segment routing protocols, thereby enabling adaptability without requiring complete system replacement or increasing overall complexity
Solution Approach 2:
The system is segmented into distinct functional components: the traditional DOCSIS MAC layer, the new Remote PHY Device with segment routing capabilities, and the packet switched network. This segmentation allows each component to be optimized independently - the DOCSIS layer maintains compatibility while the RPD layer provides advanced digital fiber and segment routing support
2Productivity
If segment routing is implemented over DOCSIS, then high-bandwidth packet transport capability is improved, but compatibility with traditional DOCSIS standards is reduced
Solution Approach 1:
The patent merges segment routing functionality with the DOCSIS MAC layer in the Remote PHY Device. The RPD combines traditional DOCSIS protocol support with modern segment routing protocols, allowing high-bandwidth packet transport through segment routing while maintaining compatibility with existing DOCSIS infrastructure through the unified device architecture
Solution Approach 2:
The Remote PHY Device is designed as a universal platform that performs multiple functions: it supports traditional DOCSIS standards for backward compatibility, implements segment routing for high-bandwidth optimization, and provides interface between coaxial and fiber networks. This multi-functionality resolves the contradiction between improved bandwidth capacity and maintained compatibility
3Ease of operation
If remote PHY technology is deployed, then separation of PHY components from CCAP is achieved, but hardware requirements for segment routing processing must be added
Solution Approach 1:
The Remote PHY Device is designed to be self-configuring and self-managing. It automatically establishes segment routing paths, configures its own forwarding tables, and manages its dual interface to DOCSIS and packet switched networks without requiring manual hardware configuration. This self-service capability offsets the added hardware requirements by reducing operational complexity
Data Source
AI summary
A system and method for facilitating communication with segment routing in a cable modem network environment may be provided. A pseudowire (PW) control packet including segment routing information including a PW segment identifier (SID) for establishing a data session between the RPD and a network element over a packet switched network is received at a remote physical device (RPD). The PW SID may be indicative of a segment in the packet switched network to be used for communicating PW data packets of the data session. The PW control packet and the PW data packets being are emulations of a point-to-point connection between the RPD and the network element. A mapping between the PW SID and the data session is written into a segment table of the RPD.