VPLS Ring Topology Media Distribution via Link Segmentation
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Solution Overview
Problem
Achieving high levels of network quality and availability in Packet Switched Networks (PSNs) for media service delivery, such as video services, is challenging due to the need for scalability and the integration of multiple services like voice and high-speed data without compromising reliability, quality, manageability, or serviceability, as compared to mature Hybrid Fiber Coaxial (HFC) networks.
Innovation Solution
A method for distributing media in a ring topology network using Virtual Private Local Area Network (VPLS) and Multi-Protocol LAN Service (MPLS) technologies, which creates a logical break in the network to prevent loops and enables replication and forwarding of multicast traffic, allowing for redundancy and rapid recovery from failures through pre-provisioned backup paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If media distribution is enabled on all communications links in a ring network, then network coverage and redundancy are improved, but network complexity and risk of loops increase
Solution Approach 1:
The patent segments the ring network into two separate unidirectional media distribution paths (clockwise and counter-clockwise) by disabling media distribution on alternate links. This segmentation prevents loops while maintaining redundancy, as each path independently distributes media without creating closed loops that would cause broadcast storms or routing conflicts.
Solution Approach 2:
Instead of enabling media distribution on all links and managing the complexity of preventing loops, the patent inverts the approach by deliberately disabling media distribution on selected links. This inversion simplifies the topology by creating a hierarchical structure where media flows in controlled directions, reducing the risk of loops while maintaining network reliability through alternative paths.
2Adaptability or versatility
If the network is configured for high scalability to support multiple services, then service versatility is improved, but network manageability and serviceability deteriorate
Solution Approach 1:
The patent implements a universal media distribution architecture where the same ring network infrastructure supports multiple services (video, voice, data) through a single standardized configuration. The bidirectional media distribution capability allows the network to adapt to different service requirements without requiring separate dedicated networks, thereby improving versatility while maintaining manageable complexity through a unified approach.
Solution Approach 2:
The patent enables dynamic service allocation on the ring network by allowing media distribution to be selectively enabled or disabled on different links based on service requirements. This dynamic configuration allows the network to adapt to varying service demands while maintaining a manageable base topology, as the same physical infrastructure can be reconfigured for different service scenarios without physical changes.
Data Source
AI summary
A method or corresponding apparatus is employed for distributing media on a ring network. Multiple nodes and communications links are configured to distribute media in the ring network. Distribution of the media is disabled on a communications link between a selected pair of adjacent nodes in the ring network in a manner maintaining communications between the selected pair of adjacent nodes other than for distribution of the media. This configuration results in a “horseshoe” topology of the ring network with respect to the media, where distribution of the media on the ring network occurs in one or two downstream directions from head-end ingress node(s) on the ring network. Virtual Private LAN Service (VPLS) may be employed to transport the media. In an event of a link or node failure, the disabled link is enabled, allowing for continued distribution of the media with network recovery in a timeframe typically unobservable by an end user.