1+N Protection for Mesh Networks Using Network Coding on Protection Cycles
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Jay Bjerke
Commercialization Manager, Engineering
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Optical fiber failures can result in disruptions in communication networks. ISU researchers have developed a technique to provide transparent non-stop service in communication networks while efficiently utilizing resources.

Development Stage:
Method demonstrated in the laboratory

The advent of optical fibers in communication network backbones has allowed large amounts of bandwidth to be carried on a single fiber. Failure of single fiber, which is not an uncommon occurrence, can therefore affect large numbers of users and connections. Preserving the ability of a network to operate, or network survivability, is thus critical if any part of the network should fail. Current methods for providing optical network survivability include predesigned protection (i.e., 1+1, where a single session is protected by duplicating the resources required by the session) and dynamic restoration (i.e., 1:N, where resources for a single session are shared among N sessions). While 1+1 protection techniques are nearly instantaneous, they require duplication of resources. 1:N techniques are more efficient, since resources for a single session are shared between N sessions. However, these methods are also slower and require management and control planes involvement, since detection of the failure, and determining which session should use the backup facilities are necessary. To overcome these drawbacks, ISU researchers have developed a 1+N protection technique for mesh networks that uses network coding on protection cycles. This method is similar to the 1+1, except that one backup circuit is shared between N sessions, and data from all N sessions is transmitted on the backup circuit. The use of the network coding technique results in significants saving over the 1+1 method, while using roughly the same resources required by the 1:N method, but at the speed of the 1+1 method.

• Transparent protection against single link failures.
• Fast protection since no failure detection or switching is involved.
• Reduced bandwidth and resource requirements, since multiple communication sessions use the same resources required to protect a single session.
• Simpler control and management planes.
• Can be implemented at a number of layers.
• Error detection and correction.
Communications networks

Patent Information:
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Country Serial No. Patent No. Issued Date
United States 12/323,598 7,869,344* 1/11/2011

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