Method for protecting sub-path when single link is fault in a WDM network

A wavelength division multiplexing network and single-link technology, which is applied in the field of optical network communication, can solve the problems of high time complexity and increased algorithm time consumption, and achieve the effect of reducing blocking rate, small blocking, and reducing network time consumption

Inactive Publication Date: 2008-12-24
NORTHEASTERN UNIV
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Problems solved by technology

[0013] Since each work may be divided into multiple sub-paths, the SSP algorithm solves the problem of protection switching time constraints, but the defect is also obvious, because it need

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  • Method for protecting sub-path when single link is fault in a WDM network
  • Method for protecting sub-path when single link is fault in a WDM network
  • Method for protecting sub-path when single link is fault in a WDM network

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Embodiment Construction

[0050] The present invention is further described in conjunction with accompanying drawing:

[0051] In order to describe the contents of the present invention conveniently, at first the following symbols and terms are defined

[0052] j: a bidirectional optical fiber link;

[0053] W: the number of wavelength resources on each fiber W=w j +f j + r j ;

[0054] CR n : service request numbered n;

[0055] |Ω|: The value is the number of elements in the set Ω;

[0056] cost j : the cost value of link j when calculating the working path;

[0057] cost j ′: the cost value of link j when calculating the protection path;

[0058] C j : The basic cost of link j, which is determined by many factors, such as: the physical length of the link, construction cost, etc.

[0059] C j * : the current cost of the link, by C j And the current network status decision.

[0060] w j : The total number of working wavelengths used on link j.

[0061] f j : The total number of rema...

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Abstract

A sub-path protection method of a single link fault in a wavelength division multiplex network belongs to the technical field of optical networking communication. The method comprises the following steps: (1) searching a path satisfying protection switching time restriction for each node pair as a working path in a network topology; and then searching a protective path satisfying protection switching time restriction and link separation for each working path; (2) mapping the network topology into a virtual topology; and (3) searching a virtual path for a reached service; and then searching a working path and a protective path with minimum resource consumption in each virtual link of the virtual path. The sub-path protection mechanism has the advantages of protection of resource sharing and protection of switching time restriction so as to improve resource utilization, reduce blockage rate, and effectively reduce networking time consumption, namely, the use times of the shortest path searching algorithm.

Description

technical field [0001] The invention belongs to the technical field of optical network communication, in particular to a sub-path protection method for single link failure in a wavelength division multiplexing (WDM) network. Background technique [0002] In recent years, due to the explosive growth of Internet services, research on high-speed transmission networks has been triggered. Wavelength Division Multiplexing (WDM) technology can make full use of the huge bandwidth resources in the optical fiber, so it is widely used. Since the transmission rate of the wavelength channel in each optical fiber can be as high as gigabits, the failure of the optical fiber link will cause a large number of service interruptions, so the protection design of the WDM optical network must be carried out. Traditionally, for the failure of optical fiber links in WDM networks, single-link failure is the main consideration. However, with the gradual increase in the scale and complexity of WDM op...

Claims

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Application Information

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IPC IPC(8): H04J14/02H04B10/08H04B10/038
Inventor 王雪葵郭磊王兴伟张愉郑小兵
Owner NORTHEASTERN UNIV
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