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WSON restoration

A path and node technology, applied in the field of dynamic restoration, can solve the problems of inability to find alternative paths and high cost of optical regeneration, and achieve the effect of improving service level and bandwidth utilization, small idle bandwidth or redundancy, and improving bandwidth utilization efficiency

Active Publication Date: 2014-07-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, pre-planning protection paths is still preferred for GMPLS-controlled wavelength-switched optical networks at present, because the probability that OTF connections will not find any alternative paths is too high
This is due to the requirement of wavelength continuity and the limit of light reach, so it is too costly to have wavelength conversion or light regeneration throughout the network

Method used

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Embodiment Construction

[0043] The present invention will be described with reference to particular embodiments and with reference to the accompanying drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and non-limiting. In the drawings, some of these elements may be exaggerated and not drawn on scale for illustrative purposes.

[0044] Acronym

[0045] CADU colorless add / drop unit

[0046] DWDM XFP Dense Wavelength Division Multiplexing 10 Gigabit Small Form Factor Pluggable Transceiver

[0047] IETF IETF Internet Engineering Task Force

[0048] GMPLS GMPLS Generic Multiprotocol Label Switching

[0049] OTF real time

[0050] PCE Path Computation Element

[0051] PP pre-planning

[0052] ROADM Reconfigurable Optical Add-Drop Multiplexer / Demultiplexer

[0053] TCO Total Cost of Ownership (CAPEX+OPEX)

[0054] WSON wavelength switched optical network

[0055] CAPEX infrastructure cost

[0056] OPEX operating expenses

[0057] ...

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Abstract

Dynamic restoration involves routing and bandwidth assignment of an unplanned restoration path in a wavelength switched optical network (20), having regeneration nodes (60), nodes each having a ROADM (62) having drop paths and add paths. An electrical switch (68) provides configurable regeneration capacity by coupling selected drop paths to selected add paths. Some of the configurable regeneration capacity is kept for unplanned restoration paths. A PCE determines (120) routing and bandwidth assignments for an unplanned restoration path for the traffic flow to avoid a fault, and sends (130) configuration messages to the nodes to set up the unplanned restoration path dynamically and to configure the electrical switch to provide regeneration on the path. Keeping some reconfigurable regeneration capacity enables much longer unplanned paths to be found to avoid faults, and enables wavelength conversion if needed. Thus the reliability of finding at least one path avoiding the fault can be increased.

Description

technical field [0001] The present invention relates to dynamic restoration in wavelength switched optical networks, to methods of using regenerative nodes in such networks, to corresponding computer programs, to methods of adapting such networks to provide dynamic restoration, to path computation elements of such networks and Regenerator nodes involved in such networks. Background technique [0002] A wavelength-switched optical network (WSON) supports end-to-end optical paths, called lightpaths, between nodes that need to be connected in the network. Intermediate nodes in this type of network support wavelength switching and may also support wavelength switching. In contrast to point-to-point optical communication links that always provide high-capacity transmission between a pair of identical nodes, WSON supports multiple pairs of nodes in networks with multiple complex topologies such as ring, interconnected ring, or mesh topologies between setup and teardown of light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/00
CPCH04J14/00H04J14/0209H04J14/0217H04J14/0257H04J14/0267H04J14/0268H04J14/0271H04J14/0284H04J14/02122H04J14/0212H04B10/032H04B10/2575H04Q11/0005H04Q2011/0043
Inventor G.博塔里D.切卡雷利D.卡维格利亚
Owner TELEFON AB LM ERICSSON (PUBL)
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