Multi-failure protection method for multiple service levels in WDM network

A service level, multi-fault technology, applied in the field of optical network communication, can solve the problem of ignoring multi-fault protection, not allowing any working channel to share the same link between the protection channels corresponding to other working channels, etc. The effect of improving resource utilization, protecting resource sharing, and reducing blocking rate

CN101262298AInactive Publication Date: 2008-09-10NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2008-09-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a protection method with a plurality of service grades for multiple faults in WDM networks, pertaining to the technical field of optical network communication. The method comprises the steps as follows: step one: connections of different grades are established for service requests arrived, that is, working accesses and accesses for protection are established; step two: for service connections conveying data in the networks, when failed links occur, the service grade is judged, different protection methods are executed to services of different grades, and enhanced recovery is executed to the service of the highest grade. The method of the invention meets the requirements for different protections raised by users in case of multilink faults in the WDM optical networks. EDSP takes into consideration of an enhanced recovery mechanism for load balancing, protection of resource sharing and resource recycling, so as to improve resource utilization rate and reduce blocking probability; effective multiple faults protection is also provided, and the requirement for services of diamond grade (highly reliable protection for multiple faults (three faults and more)), platinum grade (single fault being 100 percent protected) and economic grade (no protection) are met.
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Description

technical field

[0001] The invention belongs to the technical field of optical network communication, in particular to a multi-fault protection method for multiple service levels in a 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 failures are considered as the main failure. However, with the gradual increase in the scale and complexity of WDM optical networks, th...

Examples

Embodiment Construction

[0044] The present invention is further described in conjunction with accompanying drawing:

[0045] As shown in Table 2, this method proposes three new service levels: diamond (multi-fault (three faults and above) high reliability protection), platinum (100% protection for single fault) and economy (no protection).

[0046] Table 2 Classification of service levels

[0047] service level

user business

survival strategy

Diamond

VIP users, international e-commerce, military business...

High-reliability protection for multiple faults

Platinum type

Ordinary users, MAN services...

Single fault 100% protection

economical

Low-level business, campus business, corporate internal business...

unprotected

[0048] In order to describe the contents of the present invention conveniently, at first the following symbols and terms are defined

[0049] j: a bidirectional optical fiber link;

[0050] W: the number of waveleng...