CN109889360B - Method and device for determining regenerator placement position - Google Patents
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Abstract
The invention provides a method and a device for determining a regenerator placement position. The invention discloses a method for determining a regenerator placement position, which comprises the following steps: obtaining shortest path P between any two nodes in networki,PiIs the ith path, i is an integer greater than or equal to 1; acquiring optical signal to noise ratio OSNR of all paths; adding M paths of which the optical signal to noise ratio (OSNR) is smaller than a preset threshold value into a first set, wherein M is a positive integer; determining an attribute value of each node according to the repetition times of the nodes in the paths in the first set; and determining the placement position of the regenerator according to the attribute value of the node. The method provided by the invention effectively utilizes the regenerator resource while ensuring the signal transmission quality.
Description
Technical Field
The invention relates to the field of network planning, in particular to a method and a device for determining a regenerator placement position.
Background
The smart grid is the intellectualization of the power grid, and compared with the existing power grid, the smart grid has the remarkable characteristic of high integration of power flow, information flow and service flow. With the expansion of the scale of the power grid and the acceleration of the electric power informatization construction, the information communication network comprehensively covers various aspects such as power generation, transmission, distribution, power utilization and the like, is used for acquiring accurate information in time and provides continuous and reliable operation for power users. The information communication network is an important component of the intelligent power grid and is a basis for realizing safe, reliable, economic and efficient operation of the power grid. Therefore, a communication network development structure needs to be reasonably planned and designed, so that the network reliability is improved, and the safe and stable operation of various intelligent power grid services is supported; meanwhile, the deployment and configuration of communication resources need to be optimized, the resource utilization efficiency is improved, and the construction and operation cost of a communication network is reduced. Therefore, the development and construction of the smart grid require research on a planning and optimizing method of the smart grid communication network.
To solve the signal attenuation problem caused by long-distance transmission, an optical amplifier is introduced into the optical network deployment process. The optical amplifier can generate spontaneous radiation noise while amplifying the optical signal, and the transmission quality of the signal is affected. With the increase of service requirements, the scale of the network is larger and larger, the distance of optical signal transmission is further and further, noise introduced by an optical amplifier cannot be ignored, and how to ensure that an optical path can reach an important problem. Therefore, (O/E/O)3R regenerators with signal re-amplification, reshaping and retiming functions have also been introduced in communication networks for signal regeneration. Although the regenerator has the function of signal regeneration, it consumes much energy and has high cost, so the placement of the regenerator in the network should be optimized as much as possible to achieve the purpose of reducing power consumption and cost. In the prior art, a common approach to regenerator placement is to greedy place the regenerator in the desired optical path. Greedy algorithm (also called greedy algorithm) means that in each solving step, it requires the best operation of greedy selection, which once made is not changeable in subsequent steps and it is desired to be able to produce a "global optimal solution" to the problem by a series of optimal selections. A greedy algorithm is used in the intelligent power grid network planning, namely, the transmission quality of each optical path is evaluated, and a regenerator is placed on the optical path with unqualified transmission quality, so that the placement of the regenerator of one network is completed.
However, the use of a greedy algorithm to place regenerators does not take overall optimization into consideration, and what is done is a local optimal solution in a sense that redundantly configured regenerators may be produced, wasting resources.
Disclosure of Invention
The invention provides a method and a device for determining a regenerator placement position, which effectively utilize regenerator resources while ensuring signal transmission quality.
The invention discloses a method for determining a regenerator placement position, which comprises the following steps:
obtaining shortest path P between any two nodes in networki,PiIs the ith path, i is an integer greater than or equal to 1;
acquiring optical signal to noise ratio OSNR of all paths;
adding M paths of which the optical signal to noise ratio (OSNR) is smaller than a preset threshold value into a first set, wherein M is a positive integer;
determining an attribute value of each node according to the repetition times of the nodes in the paths in the first set;
and determining the placement position of the regenerator according to the attribute value of the node.
Further, the determining the placement position of the regenerator according to the attribute value of the node includes:
and determining the node with the maximum attribute value to place the regenerator.
Further, after the determining that the node with the largest attribute value is placed in the regenerator, the method further includes:
re-acquiring OSNRs of the M paths in the first set;
deleting paths with the OSNR greater than or equal to a preset threshold value in the first set, and resetting attribute values of all nodes as initial values;
and returning to execute the repeated times of the nodes in the paths in the first set, and determining the attribute value of each node.
Further, the method further comprises:
and if the first set is empty or the attribute value of any node is not more than 1, placing the regenerator through a greedy algorithm for the paths of which the residual osnr does not meet the condition. .
Further, the acquiring the OSNR of each path includes:
calculating OSNR according to equation (1)
Wherein,
Liis the span loss of the ith optical amplifier segment,
NFiis the spontaneous emission noise figure of the ith optical amplifier,
Poutiis the output power of the ith optical amplifier,
and N is the total number of stages.
The present invention also provides an apparatus for determining a regenerator placement position, comprising:
an obtaining module, configured to obtain a shortest path P between any two nodes in a networki,PiObtaining the OSNR of all paths for the ith path, wherein i is an integer greater than or equal to 1;
a determining module, configured to add M paths with an optical signal-to-noise ratio OSNR smaller than a preset threshold to a first set, where M is a positive integer; determining an attribute value of each node according to the repetition times of the nodes in the paths in the first set; and determining the placement position of the regenerator according to the attribute value of the node.
Further, the determining module is further configured to determine a node placement regenerator with the largest attribute value.
Further, the obtaining module is further configured to,
re-acquiring OSNRs of the M paths in the first set;
the determining module is further configured to delete the path in the first set whose OSNR is greater than or equal to the preset threshold, reset the attribute values of all the nodes to an initial value, return to execute the number of times of repetition of the node in the path in the first set, and determine the attribute value of each node.
Further, the determining module is further configured to,
and if the first set is empty or the attribute value of any node is not more than 1, placing the regenerator through a greedy algorithm for the paths of which the residual osnr does not meet the condition.
Further, the obtaining module is further configured to,
calculating OSNR according to equation (1)
Wherein,
Liis the span loss of the ith optical amplifier segment,
NFiis the spontaneous emission noise figure of the ith optical amplifier,
Poutiis the output power of the ith optical amplifier,
and N is the total number of stages.
According to the method and the device for determining the placement position of the regenerator, the placement position of the regenerator is determined according to the attribute values of the nodes by calculating the attribute values of the nodes, and the regenerator is preferentially placed in the common nodes, so that the resources of the regenerator are effectively utilized, and the effects of reducing power consumption and saving cost are achieved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart of a first embodiment of a method for determining a regenerator placement position according to the present invention;
FIG. 2 is a flowchart of a second embodiment of the method for determining the placement of the regenerator of the present invention;
fig. 3 is a block diagram of a first embodiment of the apparatus for determining the placement position of the regenerator in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Compared with a greedy placement algorithm in the prior art, the method and the device for determining the placement position of the regenerator have the advantages that the number of required regenerators is reduced, the power consumption is reduced, and the cost is saved.
Fig. 1 is a flowchart of a first embodiment of a method for determining a regenerator placement position according to the present invention, in this embodiment the method includes the following steps,
s101, obtaining the shortest path P between any two nodes in the networki；
Wherein, PiI is an integer greater than or equal to 1 for the ith path.
Specifically, the network topology is modeled as an undirected graph G (V, E), where V is a node set and E is an edge set, and a shortest path between any two nodes is found on the premise of ensuring that a light path between any two nodes is accessible.
In the invention, Dijkstra (Dijkstra) can be used as a shortest path algorithm, and the shortest path between any two nodes in the network can be obtained by using Dij stra algorithm.
Dijkstra's algorithm, which is a typical algorithm for solving the shortest path, was proposed in 1959 by dickstra, a netherlands computer scientist, to find the shortest path from a starting point to all other points.
S102, acquiring optical signal to noise ratios (OSNR) of all paths;
here, the Optical Signal to Noise Ratio (OSNR) is defined as a Ratio of Optical Signal power to Noise power within an Optical effective bandwidth of 0.1 nm.
Specifically, the OSNR can be calculated according to equation (1),
wherein,
Liis the span loss of the ith optical amplifier segment, and the unit is dB;
NFiis the spontaneous emission noise coefficient of the ith optical amplifier in dB;
Poutiis the output power of the ith optical amplifier in dBm;
and N is the total number of stages.
Alternatively, the optical signal to noise ratio OSNR can be calculated according to equation (2),
assuming that the total output power (including the accumulated amplifier spontaneous emission power) is equal after each amplifier, while the gain of the amplifier is much greater than 1, the osnr is:
OSNR＝Pout-L-NF-10lgN-10lg[hvΔB0]
(2)
wherein,
Poutis the output power of each channel power amplifier and line amplifier, with the unit being dBm;
l is the span loss in dB;
Fis the spontaneous emission noise figure of the optical amplifier, in dB;
wherein-10 lg [ hv Delta B0]＝58；
And N is the total number of stages.
The optical signal to noise ratio is used as an important parameter for representing the transmission quality of an optical signal, has great significance for an estimation and measurement system, and is calculated by adopting a formula (1) when the OSNR of an optical path is actually calculated, so that the method is more consistent with an actual application scene.
S103, adding M paths of which the optical signal to noise ratio OSNR is smaller than a preset threshold value into a first set; wherein M is a positive integer;
the preset threshold in this embodiment is set by a person skilled in the art according to the requirement of the OSNR in practical application, and is not limited to a specific value.
S104, determining the attribute value of each node according to the repeated times of the nodes in the path in the first set;
in this embodiment, time (n) is an attribute of any node n ∈ V, which represents the degree of duplication of the node in the calculated route, and the initial value is 0,
for node n, if n is a node of a path in the set L and is not the start node of the path, then time (n) ═ time (n) + 1;
and S105, determining the placement position of the regenerator according to the attribute value of the node.
In an alternative embodiment, step S105 may be specifically,
determining a node placement regenerator with the maximum attribute value;
that is, the point with the largest time is obtained, a regenerator is placed at the node, and the node is marked as a regeneration node in the path in the set L containing the node.
In another alternative embodiment, step S105 may be specifically,
determining a plurality of node placement regenerators with the largest attribute values;
the points at which time is greatest are obtained, regenerators are placed at those nodes, and the node is marked as a regeneration node in the path in set L that contains the node.
In the regenerator, after the digital signal is transmitted through the optical fiber for a long distance, the amplitude of the optical pulse is reduced and the shape of the optical pulse is distorted due to the influence of optical fiber attenuation and dispersion. In order to extend the transmission distance, a regenerator reg (regenerator) must be used.
The regenerator is used for receiving the attenuated and distorted optical signals transmitted by the long-distance optical fiber, then carrying out equalization amplification and identification, and regenerating regular optical signals suitable for line transmission to be sent out.
Optionally, a 3R regenerator is used in this embodiment, and the basic function of the 3R regenerator is to perform optical-electrical-optical conversion on the optical signal, and when the optical signal is converted into an electrical signal, three important processing procedures of re-amplification, re-timing and re-shaping are performed, so as to perform balanced amplification on the input small distorted signal.
The invention provides a regenerator placement method based on OSNR, which is used for researching the regenerator placement problem and effectively utilizing regenerator resources while ensuring the signal transmission quality.
The invention determines the placement position of the regenerator by calculating the attribute value of the node according to the attribute value of the node, preferentially places the regenerator on the common node, effectively utilizes the resources of the regenerator, and achieves the effects of reducing power consumption and saving cost.
FIG. 2 is a flowchart of a second embodiment of the method for determining the placement of the regenerator of the present invention; the embodiment shown in fig. 2 is based on the embodiment shown in fig. 1, and specifically, in the method of this embodiment, after step S105, the method further includes:
s106, re-acquiring OSNRs of the M paths in the first set;
in this embodiment, specifically, the OSNR of all paths in the first set is recalculated.
S107, deleting paths with the OSNR greater than or equal to a preset threshold value in the first set, and resetting the attribute values of all the nodes as initial values;
in this embodiment, the initial value of the attribute value is set to 0;
specifically, paths having an OSNR greater than or equal to a preset threshold are removed from the first set, and times (n) of all nodes are reset to 0.
S108, if the first set is empty or the attribute value of any node is not more than 1, the step S109 is executed, otherwise, the step S104 is executed again;
in this embodiment, if the OSNR of the path in the first set meets the requirement after the regenerator is placed, the OSNR is removed from the path set, and the iteration is repeated until the path set is empty or the repetition degree of any node is not greater than 1.
And S109, for the path with the OSNR smaller than the preset threshold, placing the regenerator through a greedy algorithm.
In the method for determining the placement position of the regenerator provided in this embodiment, the OSNR of all paths is calculated first, then the regenerator is preferentially placed at a node with a high repetition rate for a path whose OSNR does not satisfy a threshold condition, if the OSNR of the path after placing the regenerator satisfies a requirement, the path is removed from the path set, and so on, and iteration is repeated until the path set is empty or the repetition rate of any node is not greater than 1.
FIG. 3 is a block diagram of a first embodiment of the apparatus for determining the placement of the regenerator in accordance with the present invention;
as shown in fig. 3, the apparatus for determining the placement position of the regenerator of the present invention comprises:
an acquisition module 31 and a determination module 32;
the obtaining module 31 is configured to obtain a shortest path Pi between any two nodes in the network, where Pi is an ith path and i is an integer greater than or equal to 1, and obtain an OSNR of all paths;
the determining module 32 is configured to add M paths, where the OSNR is smaller than a preset threshold, to the first set, where M is a positive integer; determining an attribute value of each node according to the repetition times of the nodes in the paths in the first set; and determining the placement position of the regenerator according to the attribute value of the node.
Optionally, the determining module is further configured to determine that the node with the largest attribute value places the regenerator.
Optionally, the obtaining module is further configured to,
re-acquiring OSNRs of the M paths in the first set;
the determining module is further configured to delete the path in the first set whose OSNR is greater than or equal to the preset threshold, reset the attribute values of all the nodes to an initial value, return to execute the number of times of repetition of the node in the path in the first set, and determine the attribute value of each node.
Optionally, the determining module is further configured to,
and if the first set is empty or the attribute value of any node is not more than 1, placing the regenerator by a greedy algorithm for the path of which the residual OSNR does not meet the condition.
Optionally, the obtaining module is further configured to,
calculating OSNR according to equation (1)
Wherein,
Liis the span loss of the ith optical amplifier segment, and the unit is dB;
NFiis the spontaneous emission noise coefficient of the ith optical amplifier in dB;
Poutiis the output power of the ith optical amplifier in dBm;
and N is the total number of stages.
The apparatus of this embodiment may be used to implement the technical solutions of the method embodiments shown in fig. 1-2, and the implementation principles and technical effects are similar, which are not described herein again.
The method and the device for determining the placement position of the regenerator provided by the invention have the advantages that the OSNR of all paths is calculated firstly, then the regenerator is preferentially placed at the node with high repeatability for the path with the OSNR not meeting the threshold condition, if the OSNR of the path meets the requirement after the regenerator is placed, the regenerator is removed from the path set, and iteration is repeated by analogy until the path set is empty or the repeatability of any node is not more than 1, if the OSNR of the path does not meet the condition after the operation, the regenerator is placed by a greedy algorithm, compared with the existing greedy placement algorithm, the number of the needed regenerators is reduced, the power consumption is reduced, and the cost is saved.
It should be noted that the division of the modules of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the determining module may be a processing element separately set up, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the determining module is called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of determining regenerator placement comprising the steps of:
obtaining shortest path P between any two nodes in networki,PiIs the ith path, i is an integer greater than or equal to 1;
acquiring optical signal to noise ratio (OSNR) of all paths, wherein the OSNR is used for representing the transmission quality of optical signals;
adding M paths of which the optical signal to noise ratio (OSNR) is smaller than a preset threshold value into a first set, wherein M is a positive integer;
determining an attribute value of each node according to the repetition times of the nodes in the paths in the first set;
and determining the placement position of the regenerator according to the attribute value of the node.
2. The method of claim 1, wherein determining a placement location of a regenerator based on the attribute values of the nodes comprises:
and determining the node with the maximum attribute value to place the regenerator.
3. The method of claim 2, wherein after determining that the node with the largest attribute value is placed in the regenerator, the method further comprises:
re-acquiring OSNRs of the M paths in the first set;
deleting paths with the OSNR greater than or equal to a preset threshold value in the first set, and resetting attribute values of all nodes as initial values;
and returning to execute the repeated times of the nodes in the paths in the first set, and determining the attribute value of each node.
4. The method of claim 3, further comprising:
and if the first set is empty or the attribute value of any node is not more than 1, placing the regenerator by a greedy algorithm for the path of which the residual OSNR does not meet the condition.
5. The method according to any one of claims 1-4, wherein said obtaining the OSNR of each path comprises:
calculating OSNR according to equation (1)
Wherein L isiIs the span loss of the ith optical amplifier segment, NFiIs the spontaneous emission noise figure, P, of the ith optical amplifieroutiIs the output power of the ith optical amplifier and N is the total number of stages.
6. An apparatus for determining a regenerator placement position, comprising:
an obtaining module, configured to obtain a shortest path P between any two nodes in a networki,PiAcquiring optical signal to noise ratio (OSNR) of all paths for the ith path, wherein i is an integer greater than or equal to 1, and the OSNR is used for representing the transmission quality of optical signals;
a determining module, configured to add M paths with an optical signal-to-noise ratio OSNR smaller than a preset threshold to a first set, where M is a positive integer; determining an attribute value of each node according to the repetition times of the nodes in the paths in the first set; and determining the placement position of the regenerator according to the attribute value of the node.
7. The apparatus of claim 6, wherein the determining module is further configured to determine a node placement regenerator with a largest attribute value.
8. The apparatus of claim 7, wherein the obtaining module is further configured to,
re-acquiring OSNRs of the M paths in the first set;
the determining module is further configured to delete the path in the first set whose OSNR is greater than or equal to the preset threshold, reset the attribute values of all the nodes to an initial value, return to execute the number of times of repetition of the node in the path in the first set, and determine the attribute value of each node.
9. The apparatus of claim 8, wherein the determination module is further configured to,
and if the first set is empty or the attribute value of any node is not more than 1, placing the regenerator by a greedy algorithm for the path of which the residual OSNR does not meet the condition.
10. The apparatus according to any one of claims 6-9, wherein the obtaining module is further configured to,
calculating OSNR of each path according to equation (1)
Wherein L isiIs the span loss of the ith optical amplifier segment, NFiIs the spontaneous emission noise figure, P, of the ith optical amplifieroutiIs the output power of the ith optical amplifier and N is the total number of stages.
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