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Resource allocation method of multi-core elastic optical network based on nodes and crosstalk perception

An elastic optical network and resource allocation technology, which is applied in the field of multi-core elastic optical network resource allocation based on nodes and crosstalk perception, can solve the problems of optical signal power leakage, unsuitable device configuration, and high degree of edge nodes, so as to improve successful transmission The probability of reducing the probability of blocking and the effect of reducing costs

Active Publication Date: 2021-07-09
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Existing methods to measure the importance of nodes are either directly sorted by node degree or by node load. The former has the phenomenon that the degree of edge nodes may be higher, which is not objective enough. The latter is only when there is a business request transmission in the network Decisions can be made, device configurations not available for nodes
In a multi-core elastic optical network, inter-core crosstalk (Inter-Core Crosstalk, ICXT) will inevitably occur between the cores, that is, service requests will overlap frequency slots during transmission, causing optical signal power to leak to adjacent cores , affecting the quality of service transmission

Method used

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  • Resource allocation method of multi-core elastic optical network based on nodes and crosstalk perception
  • Resource allocation method of multi-core elastic optical network based on nodes and crosstalk perception
  • Resource allocation method of multi-core elastic optical network based on nodes and crosstalk perception

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Embodiment Construction

[0044] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] attached figure 1 It is a flowchart of a resource allocation method for a multi-core elastic optical network, which will be described in detail below:

[0046] Step 1: Statistics the available resources of the network, initialize the set of candidate paths P=Φ, the betweenness centrality value calculated according to formula (1) ranks the nodes in the network, and according to the given value range of θ, select |V|× θ nodes, which are configured with finite spectrum converters in turn, where, L is the number of links in the network, is an integer value rounded up;

[0047]

[0048] In formula (1), V is the set of nodes in the network, p i (s, t) means the number of the shortest path between the source node s and the destination node t passing through the intermediate node i, |V| means the number of nodes in the network, 0.5(...

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Abstract

The invention relates to a resource allocation method of a multi-core elastic optical network based on nodes and crosstalk perception, and belongs to the technical field of optical fiber communication. The method comprises the following steps: determining node importance according to intermediary centrality of nodes, arranging the nodes in a descending order according to the node importance, and configuring a limited spectrum converter for the ordered optical network nodes according to a certain proportion value of the number of the optical network nodes; in a route selection stage of a service request, designing a path weight calculation method considering path load and a use proportion of a limited spectrum converter in a path, and arranging candidate paths in an ascending order; in the fiber core spectrum allocation stage, adopting a fiber core grouping and spectrum partitioning method, designing a fiber core spectrum selection method considering the compactness of spectrum intervals and the number of overlapped frequency slots of the spectrum intervals, and reducing the crosstalk value between fiber cores; for the service request with failed spectrum allocation, searching the available spectrum block for the service request again through the limited spectrum converter, so the probability of successful transmission of the service is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a multi-core elastic optical network resource allocation method based on node and crosstalk perception. Background technique [0002] With the rapid development of Internet services, the consumption of network bandwidth resources continues to increase. Optical networks are favored by operators due to their advantages such as large transmission capacity and long transmission distance. Traditional WDM networks use fixed spectrum granularity and a single modulation format, which cannot meet flexible and changeable service requests. Elastic Optical Networks (EONs) based on OFDM technology can flexibly allocate spectrum granularity and adaptively select modulation formats, and have received extensive attention and research in recent years. With the ever-increasing demand for traffic, EONs using single-core optical fibers can no longer meet the transmission needs of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00
CPCH04Q11/0062H04Q11/0005H04Q2011/0086H04Q2011/009
Inventor 刘焕淋胡会霞陈勇胡俊岭唐畅
Owner CHONGQING UNIV OF POSTS & TELECOMM
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