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Routing and frequency spectrum allocating method and routing and frequency spectrum allocating equipment

A configuration method and routing technology, which is applied in the directions of multiple use of transmission paths, digital transmission systems, data exchange networks, etc., can solve problems such as connection demand blocking and insufficient utilization of adjacent sub-carriers, so as to reduce easy to be blocked, High spectrum diversity gain and the effect of improving utilization

Inactive Publication Date: 2014-03-26
广西融恒信网络科技有限公司
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Problems solved by technology

[0009] However, with the centralized subcarrier allocation approach described above, when there are not enough contiguous subcarriers on each routing path, the connection demand will be blocked
However, the small number of adjacent subcarriers on the optical communication network has not been fully utilized.

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  • Routing and frequency spectrum allocating method and routing and frequency spectrum allocating equipment

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Embodiment Construction

[0053] Refer to the attached Figure 2-13 , describe in detail the routing and spectrum configuration method and the routing and spectrum configuration device according to the present invention.

[0054] The core of the present invention is to adopt the adaptive distributed subcarrier allocation method (ASD-RSA). At present, many algorithms have been proposed for the allocation of routing spectrum resources in elastic optical networks. In the static layer, there are allocation algorithms based on transmission distance and bit rate adaptive modulation. In the dynamic layer, there are various allocation algorithms for time-varying traffic, etc. . All of the above algorithms adopt a subcarrier centralized allocation method (T-RSA), that is, all subcarriers allocated for a connection requirement are adjacent to each other. In the adaptive distributed subcarrier allocation method of the present invention, a connection requirement can use a group of subcarriers adjacent to each ot...

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Abstract

The invention provides a routing and frequency spectrum allocating method and routing and frequency spectrum allocating equipment which are used for configuring transmission channels based on a connection demand between any one pair of nodes on an optical communication network for OFDM (Orthogonal Frequency Division Multiplexing). The optical transmission network can be an elastic optical network, and correspondingly, the transmission channel is an optical path. The optical communication network allows that multiple transmission channels are arranged between one pair of nodes, wherein multiple alternative transmission channels are arranged between at least one pair of nodes, and each alternative transmission channel is provided with multiple continuous idle spectrum fragments. The method comprises the following step: when the idle spectrum fragment quantity of each alternative transmission channel among the multiple alternative transmission channels is not greater than the spectrum fragment quantity required for one connection demand, allocating at least two transmission channels among the multiple alternative transmission channels to the one connection demand. By adopting the method and the equipment, a phenomenon that a bandwidth demand is easily blocked is reduced, higher spectrum diversity gain is obtained, the utilization rate of spectrum resources is improved, and further limited spectrum resources are saved.

Description

technical field [0001] The invention relates to the field of optical core networks, in particular to a routing and spectrum configuration method and a routing and spectrum configuration device in an elastic optical network. Background technique [0002] The elastic optical network based on Optical Orthogonal Frequency Division Multiplexing (O-OFDM) technology is proposed on the basis of Wavelength Division Multiplexing (WDM) network in recent years, also known as ultra-dense wavelength division multiplexing. The network uses flexible spectrum segmentation standards and extremely fine spectrum segmentation granularity, and allocates just the right spectrum resources for each connection requirement through the flexible combination of spectrum slices (that is, the width occupied by a single subcarrier) to save spectrum resources. [0003] figure 1 A simple topology of the core network of the elastic optical network is shown. [0004] The core network 100 of the O-OFDM-based e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L12/701H04L12/911
Inventor 肖媚张振荣
Owner 广西融恒信网络科技有限公司
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