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Path computation element system and method of routing and wavelength assignment in a wavelength switched optical network

A path calculation unit and path calculation request technology, which is applied in the direction of data exchange network, optical multiplexing system, wavelength division multiplexing system, etc., can solve the problems of excessive optical noise and constraints

Inactive Publication Date: 2013-04-10
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Path calculations can also be constrained by other issues along the optical path, e.g., excessive optical noise

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  • Path computation element system and method of routing and wavelength assignment in a wavelength switched optical network
  • Path computation element system and method of routing and wavelength assignment in a wavelength switched optical network
  • Path computation element system and method of routing and wavelength assignment in a wavelength switched optical network

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Embodiment Construction

[0027] It should be understood at the outset that, although an illustrative implementation of one or more embodiments is provided below, the disclosed systems and / or methods may be implemented using any number of techniques, whether currently known or in existence. The invention should in no way be limited to the illustrative implementations, drawings, and techniques illustrated below, including the exemplary designs and implementations illustrated and described herein, but may be protected within the scope of the appended claims and their equivalents. Modify within the complete scope of the object.

[0028] This text discloses a system and method for extending PCEP to accommodate RWA in WDM networks such as WSON. Previous versions of PCEP allowed PCE to control WA using explicit label control (eg, centralized WA), or allowed NEs on the optical path to determine WA (eg, distributed WA). The extensions disclosed in this text make a trade-off between centralized WA and distribu...

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Abstract

The disclosure includes an apparatus comprising a path computation element (PCE) that manages the processes of routing in an optical network, wherein the PCE receives a path computation request and provides a wavelength range to a network element (NE), and wherein the NE assigns a wavelength from the wavelength range. Also disclosed is an apparatus comprising a path computation client (PCC) that sends a path computation request to a path computation client (PCE) using path computation element communication protocol (PCEP), and receives a routing and wavelength assignment (RWA) reply to the path computation request using PCEP, wherein the RWA reply comprises an PCEP error message comprising a PCEP error object and an error value to indicate errors associated with the RWA request.

Description

[0001] Cross References to Related Applications [0002] The present invention requires the prior application of U.S. Provisional Patent Application No. 61 / 442,117, filed by Yong Li on February 11, 2011, entitled "Path Calculation Unit System and Method for Routing and Wavelength Assignment in Wavelength-Switched Optical Networks" Where priority is claimed, the content of this earlier application is incorporated herein by reference as if reproduced in its entirety. Background technique [0003] Wavelength Division Multiplexing (WDM) is a technology envisioned to increase bandwidth capacity and enable bi-directional communication in optical networks. In a WDM network, multiple data signals can be transmitted simultaneously between network elements (NEs) using a single optical fiber. Specifically, different transmission wavelengths can be assigned to each signal, so that the signals do not interfere or collide with each other. The path a signal takes through a network is calle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02H04L12/717H04Q11/00H04L45/42
CPCH04J14/0257H04J14/0258H04L45/42H04L45/62H04Q11/0062H04Q2011/0077H04L45/645H04L45/00
Inventor 李勇
Owner HUAWEI TECH CO LTD
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