Optimal routing computing method for variable bandwidth optical network
A computing method and optical network technology, applied in the field of communication, can solve the problems of high complexity, unable to meet the real-time routing calculation requirements of actual dynamic networks, and high blocking rate, and achieve the effect of reducing complexity.
Active Publication Date: 2014-09-10
TSINGHUA UNIV
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Problems solved by technology
The problem with this existing technology is that it is impossible to calculate the optimal route, and the blocking rate is very high
The problem with the existing technology is that in the worst case, especially in the process of calculating the shortest path, all possible paths in the network need to be traversed, and the complexity is very high at the factorial level, which cannot meet the real-time routing calculation requirements of the actual dynamic network
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[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0028] figure 1 It is a flowchart of a route calculation method for a variable bandwidth optical network according to an embodiment of the present invention. Such as figure 1 As shown, the route calculation method for a variable bandwidth optical network according to an embodiment of the present invention includes the following steps.
[0029] Step S101, when a service routing request arrives, discretize the spectrum resources of the variable bandwidth optical network to obtain multiple discrete frequency points, and set the starting f...
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The present invention proposes a routing calculation method for a variable bandwidth optical network, which includes the following steps: when a service routing request arrives, discretize the spectrum resources of the variable bandwidth optical network to obtain multiple discrete frequency points, and convert the entire The starting frequency of the spectrum segment is set to the first discrete frequency point; the spectrum window is calculated according to the routing request bandwidth and the properties of the variable bandwidth optical network; and starting from the first discrete frequency point, the frequency value increases according to the frequency The window scans each discrete frequency point for routing in variable bandwidth optical networks. According to the method of the embodiment of the present invention, the routing calculation complexity can be reduced to the polynomial level on the premise of ensuring the optimal routing calculation.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a route calculation method for a variable bandwidth optical network. Background technique [0002] With the continuous growth of Internet data traffic, optical networks are facing new challenges in terms of network capacity. WDM (Wavelength Division Multiplexing, wavelength division multiplexing) technology can improve bandwidth resource utilization to a certain extent, but due to the limitation of the ITU-T fixed grid, the spectrum efficiency still cannot achieve satisfactory results. Orthogonal frequency division multiplexing technology uses multiple variable number of sub-carriers to transmit data. The variable bandwidth optical network based on this technology can make full use of bandwidth resources and has a high resource utilization rate, and has begun to be applied. [0003] In the variable bandwidth optical network, RSA (Route and Spectrum Assignment, routing and...
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IPC IPC(8): H04L12/733H04Q11/00H04L45/122
Inventor 华楠刘阳郑小平张汉一周炳琨
Owner TSINGHUA UNIV