Packet Engine QoS Assignment for Distributed Cable Service Flows
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Solution Overview
Problem
The existing coaxial cable television (CATV) systems face bandwidth limitations in transmitting high-speed digital data, making it challenging to meet the increasing demands for digital services like video-on-demand and high-speed Internet, while extending optical fiber to each household is economically unfeasible.
Innovation Solution
A distributed CATV cable system, also known as a virtualized CCAP (VCAP) system, uses remote distribution nodes to handle RF communications and a packet engine to map cable service flows to an IP network, enabling efficient data packet exchange and quality of service (QoS) management through logical interfaces and class of service (CoS) prioritization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If optical fiber is extended to each household to increase bandwidth capacity, then data transmission capacity is improved, but system complexity and cost increase significantly
Solution Approach 1:
The system segments the network into three distinct parts: the existing coaxial cable infrastructure for RF signal distribution, optical fiber for backbone connectivity between headend and remote nodes, and cable modems for customer premises. This segmentation allows each component to operate in its optimal domain while avoiding the need to replace the entire infrastructure with fiber.
Solution Approach 2:
The patent introduces an intermediary device (remote node or bridge) that converts between RF signals on the coaxial cable and optical signals on the fiber network. This intermediary enables the existing coaxial infrastructure to be leveraged while gaining the high capacity of fiber, without requiring fiber extension to every household.
2Quantity of substance
If optical fiber is extended to each household to meet increasing digital data demands, then bandwidth availability is improved, but economic feasibility deteriorates
Solution Approach 1:
The system dynamically allocates bandwidth resources by implementing QoS mechanisms that can adjust priority levels and resource allocation based on service type and demand. This allows the existing infrastructure to efficiently serve varying bandwidth requirements without requiring over-provisioning for peak demands.
Solution Approach 2:
The patent changes the operational parameters of the existing coaxial infrastructure by implementing DOCSIS protocols and QoS mechanisms that enable high-speed data transmission over the legacy infrastructure, effectively increasing bandwidth availability without physical infrastructure changes at the customer premises.
3Reliability
If QoS is assigned to cable service flows through packet engine mapping, then quality of service is improved, but device complexity increases
Solution Approach 1:
The packet engine implements universal QoS handling that works across multiple service types and protocols. By creating a standardized mapping mechanism between cable service flows and IP network connections, the system provides quality of service guarantees for various applications (video, data, voice) through a single unified approach rather than separate mechanisms for each service type.
Data Source
AI summary
A novel method of handling network traffic for cable service flows in a distributed cable system is presented. Such a cable systems use remote distribution nodes in the fields to handle RF communications with cable modems in a distributed fashion. A packet engine is configured to assign a logical interface to each cable service flow in the cable system. Each logical interface in the packet engine is uniquely identifiable by a compound identifier that includes the identifier of the corresponding service flow and the identifier of the remote distribution node. Each service flow is assigned a class of service (CoS) at the packet engine and guarantee a certain level of quality of service (QoS). In some embodiments, each cable service flow is assigned a CoS priority number. For each possible CoS priority number, the packet engine is configured to provide certain resources at certain quality level, i.e., certain level of QoS. Each remote distribution node tags each packet of a cable service flow with its assigned CoS priority number and forwards the tagged packet toward the packet engine.