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Network coding based wavelength conflict solution in WDM (Wavelength Division Multiplex) multicast network

A network coding and wavelength technology, applied in the field of optical switching network, can solve the problems of high cost of full-wavelength converters and unsatisfactory wavelength conflicts

Inactive Publication Date: 2010-11-03
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that full-wavelength converters are expensive and limited wavelength converters are not ideal for solving wavelength conflicts, and use network coding technology to solve wavelength conflicts between multicast requirements and unicast signals in WDM multicast networks problem, greatly improving its ability to resolve wavelength conflicts on the basis of reducing the cost of wavelength conversion

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  • Network coding based wavelength conflict solution in WDM (Wavelength Division Multiplex) multicast network
  • Network coding based wavelength conflict solution in WDM (Wavelength Division Multiplex) multicast network
  • Network coding based wavelength conflict solution in WDM (Wavelength Division Multiplex) multicast network

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Embodiment Construction

[0025] Such as figure 1 In the shown multicast tree, node S is a multicast source node, which is used to send multicast signals to the destination node; node d 11 -d 33 It is a multicast destination node for receiving multicast signals; the wavelength marked on each link in the figure is the available wavelength on the link. Suppose the source node S adopts λ 0 When sending a multicast signal to the downstream link, if the path between the source node and the destination node λ 0 When both are available, the multicast signal can be normally transmitted to the destination node. For example figure 1 Middle path S->1->d 11 and path S->3->d 31 , the λ in these two paths 0 are available, so the multicast signal can be transmitted from the source node S to the destination node d without blocking 11 and d 31 .

[0026] However, at link 1->d 12 , 1->d 13 , 2->d 21 , 2->d 22 ,3->d 32 ,3->d 33 on, λ 0 Occupied by unicast signals to the same destination as multicast sign...

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Abstract

The invention discloses a method for solving wavelength conflicts in a WDM (Wavelength Division Multiplex) network on the basis of a network coding technology and an implementation process thereof. The network coding technology derives from a classic network coding theory but is different from the traditional network coding theory and lays an extra emphasis on improving the network property and providing protection and fault tolerance functions for a network, and in the invention, the idea of the network coding technology is firstly utilized to provide a brand new solution and approach for the wavelength conflict problems among different services in the WDM multicast network. The core idea for solving the wavelength conflicts among different services in the WDM network by adopting the network coding technology is that different service signals with conflicts are converted into a new code signal after a network coding operation, and the code signal can be borne by any available wavelength and carries out code restoration on the original signals at a next-hop node or a target node so as to complete the operation.

Description

technical field [0001] The invention relates to a wavelength conflict resolution method based on network coding in a wavelength division multiplexing (WDM) multicast network and its realization process and steps, belonging to the technical field of optical switching networks. Background technique [0002] In a simple WDM network, any two nodes need to use the same wavelength for information transmission. For a general WDM network, due to its characteristics of large amount of data carried and various types of services, these characteristics will make it difficult to ensure that any two nodes use the same wavelength for information transmission in the WDM network. In addition, from the perspective of improving the utilization rate of WDM network wavelength resources and improving WDM network performance, it is unnecessary to reserve the same wavelength for service transmission on any path, and it will lead to waste of resources. [0003] In order to ensure the normal and eff...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04J14/02
Inventor 纪越峰曲志坚柏琳
Owner BEIJING UNIV OF POSTS & TELECOMM
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