Method and node entity in optical network

A network node, optical network technology, applied in the field of optical network

Active Publication Date: 2016-04-13
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that this approach leads to very conservative routing and prevents any kind of dynamic wavelength provisioning and recovery (i.e. recovery is not possible on the fly)

Method used

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  • Method and node entity in optical network
  • Method and node entity in optical network
  • Method and node entity in optical network

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Embodiment Construction

[0034] In the following description, for purposes of illustration and not limitation, specific details are set forth, such as particular circuits, circuit components, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to those skilled in the art that the invention, as well as other embodiments that depart from these specific details, may be practiced. In other instances, detailed descriptions of well-known methods, devices, and circuits are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0035] figure 1 An optical communication network 10 is shown with a mesh topology of links 30 between nodes. The nodes of the network 10 comprise routers / multiplexers 4, 6 capable of switching traffic at a particular wavelength and also switching traffic between different wavelengths. exist figure 1Two types of router / multiplexers are shown in : Label Edge Router (LER) / Reconf...

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Abstract

The present invention relates to a method and a node for distributing physical (PI) parameters used when establishing an optical path for user traffic through routing and wavelength assignment of optical channels carried in optical links in a wavelength-switched optical network (WSON) entity. It is also an object of the present invention to specify an object format to be introduced in a link-state routing protocol, such as the OSPF-TE protocol, configured to carry information about physical impairments. When considering dynamic wavelength provisioning, this information set is required for the feasibility evaluation of lightpaths to be established across the optical switched network controlled by the WSON control plane.

Description

technical field [0001] The invention relates to a method and a node entity in an optical network. More specifically, methods and node entities for distributing physical impairment parameters and for establishing optical paths for user traffic are provided. Background technique [0002] A wavelength-switched optical network (WSON) supports an end-to-end optical path, called a lightpath, between nodes requiring connectivity in the network. Intermediate nodes in this type of network support wavelength switching and may also support wavelength conversion. Compared to point-to-point optical communication links (which are always between the same pair of nodes) which provide high-capacity transmission, WSON supports nodes of networks with more complex topologies such as rings, interconnected rings, or mesh topologies The setup and teardown of the optical path between the pairs. The Routing and Wavelength Assignment (RWA) function of the WSON performs the tasks of routing and ass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04Q11/00
CPCH04J14/0221H04J14/0227H04Q2011/0073H04Q2011/0086H04J14/0257H04J14/0258H04J14/0267H04J14/0271H04J14/0269H04J14/0284
Inventor E·贝拉加姆巴G·博塔里E·杜蒂
Owner TELEFON AB LM ERICSSON (PUBL)
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