CN113141548B - Method, system and device for dynamically connecting optical line terminal and optical network unit - Google Patents
Method, system and device for dynamically connecting optical line terminal and optical network unit Download PDFInfo
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Abstract
The invention provides a method, a system and a device for dynamically connecting an optical line terminal and optical network units, wherein the method deploys the optical network units which are relatively large in association in the communication process under the same optical line terminal based on a flow relation matrix among the optical network units so as to fully utilize the exchange capacity of the optical line terminal, reduce the data interaction among different optical line terminals, reduce the network pressure of a convergence side, reduce the pressure of a metropolitan area network, reduce the algorithm complexity and improve the deployment response rate while obtaining relatively high flow gain.
Description
Technical Field
The present invention relates to optical fiber communication and optical network traffic transmission, and in particular, to a method, a system, and an apparatus for dynamically connecting an optical line terminal and an optical network unit.
Background
The optical fiber communication technology has become an important communication medium in the backbone network due to its advantages of large transmission bandwidth, strong interference resistance, and reduced attenuation, and the optical network based on the optical fiber communication technology has gradually become one of the important network technologies. However, due to the defects of single network structure, various access network technologies, lack of global control in a distributed architecture and the like of the conventional network, more researchers introduce the SDN (software defined network) technical idea into the optical access network, and propose a flexible Passive Optical Network (PON) architecture to improve the network flexibility. However, while making the network more intelligent and flexible, the complexity of the system is increased.
For scenes similar to a large park, with the rapid rise of network traffic, a plurality of OLTs are often arranged at the central office to meet the demand of large traffic bandwidth. In the traditional network, many unnecessary flows are released to enter the convergence side due to some problems such as a security authentication mechanism and the like, the pressure of the convergence side is increased, and many unnecessary time delays are introduced through the forwarding of the metropolitan area network.
Therefore, a method is needed to manage network resources more efficiently, and reduce algorithm complexity and time cost while performing bandwidth grooming on a large traffic scene.
Disclosure of Invention
The embodiment of the invention provides a method, a system and a device for dynamically connecting an optical line terminal and an optical network unit, which are used for flexibly and dynamically connecting the optical line terminal and the optical network unit.
The technical scheme of the invention is as follows:
in one aspect, the present invention provides a method for dynamically connecting an optical line terminal and an optical network unit, which is applicable to a plurality of optical line terminals and optical network units that are dynamically connected through an optical distribution network, wherein the optical network unit is provided with a tunable laser, and each optical line terminal and the optical distribution network are connected with a software-defined network controller, and the method includes:
acquiring a flow relation matrix among a plurality of optical network units to be connected at a set time point;
in a deployment operation cycle, randomly acquiring an unconnected optical network unit to establish a to-be-connected optical network unit subset for connecting a set optical line terminal; calculating the communication flow of each unconnected optical network unit and the subset of the optical network units to be connected according to the flow relation between the optical network units recorded in the flow relation matrix, acquiring one of the rest unconnected optical network units with the largest communication flow of the subset of the optical network units to be connected and adding the obtained one into the subset of the optical network units to be connected, and repeating the operation to add the optical network units with the set number into the subset of the optical network units to be connected;
based on the rest optical network units, continuously performing a plurality of deployment operation cycles to respectively construct a corresponding optical network unit subset to be connected for each optical line terminal;
and controlling each optical line terminal to respectively connect the optical network units in the sub-sets of the optical network units to be connected according to the sub-sets of the optical network units with the connection constructed by the plurality of deployment operation cycles.
In some embodiments, the method further comprises: and continuously setting a plurality of the set time points based on the first time interval, and re-acquiring the traffic relation matrix between the optical network units at each set time point for re-deploying the connection between each optical line terminal and the optical network units.
In some embodiments, the method further comprises: collecting communication flow among the optical line terminals based on a second time interval, and calculating the sum of the communication flow among the optical line terminals at each time point;
and if the sum of the communication flow is higher than the set threshold value, re-acquiring the flow relation matrix among the optical network units for re-deploying the connection between the optical line terminals and the optical network units.
In some embodiments, controlling each optical line terminal to be connected to an optical network unit in a corresponding subset of optical network units to be connected respectively includes: and acquiring the wavelength information of each optical line terminal, and sending the wavelength information of each optical line terminal to each optical network unit in the corresponding optical network unit subset to be connected so as to control each optical network unit to be switched to the corresponding wavelength and establish a membership relationship.
In some embodiments, the traffic relation matrix is generated by counting, by the software-defined network controller, communication traffic of a plurality of optical network units inside each optical line terminal and communication traffic of a plurality of optical network units between each optical line terminal.
In some embodiments, after controlling each optical line terminal to be connected to an optical network unit in a corresponding subset of optical network units to be connected, the method further includes: and generating a connection deployment log according to the optical network unit subset to be connected corresponding to each optical line terminal at the set moment.
In another aspect, the present invention further provides a system for dynamically connecting an optical line terminal and an optical network unit, including:
the optical network unit is provided with a tunable laser;
the optical distribution network is used for dynamically connecting each optical network unit to each optical line terminal;
and the software defined network controller is respectively connected with each optical line terminal and the optical distribution network and is used for executing the dynamic connection method of the optical line terminal and the optical network unit.
In some embodiments, the optical distribution network is comprised of a plurality of arrayed waveguide gratings.
In another aspect, the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described above.
In another aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method.
The invention has the beneficial effects that:
in the method, the system and the device for dynamically connecting the optical line terminal and the optical network units, the optical network units which are relatively large in association in the communication process are deployed under the same optical line terminal based on the flow relation matrix among the optical network units so as to fully utilize the exchange capacity of the optical line terminal, reduce data interaction among different optical line terminals, reduce the network pressure of a convergence side, reduce the pressure of a metropolitan area network, obtain higher flow gain, reduce algorithm complexity and improve deployment response rate.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:
fig. 1 is a logic diagram of a dynamic connection method between an optical line terminal and an optical network unit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection structure of a dynamic connection system between an optical line terminal and an optical network unit according to an embodiment of the present invention;
fig. 3 is a comparison diagram of the cross-OLT flow of a network structure constructed by a dynamic connection method of an optical line terminal and an optical network unit and a 4-step iterative bisection algorithm under 8 OLTs according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.
Under the background of deployment of a clustered OLT (optical line terminal), the improvement of the broadband efficiency of an OLT cluster ascending to a metropolitan area network is of great significance, and in a converged access network architecture with a convergence ratio characteristic, a converged side bandwidth resource has higher saving value than an access side bandwidth resource. In the fixed network architecture scenario, some data traffic must be exchanged through the metro or core network devices, which causes metro/core network bandwidth resource waste and additional forwarding processing delay, and conflicts with the increasingly tight bandwidth supply. Aiming at the problem, a centralized flexible optical access network architecture is provided, an optical connection matrix or AWG (arrayed waveguide grating) is added at a local side, a tunable laser is added at an ONU (optical network unit), and an SDN controller is used for obtaining global information and controlling wavelength switching of the tunable laser, so that the corresponding relation between the OLT and the ONU is dynamically adjustable. Therefore, the large-flow service can be adjusted to be under the same OLT, and the bandwidth pressure of the convergence side can be relieved without the need of metropolitan area network transmission. The algorithm which can be used under the framework is a 4-step iteration dichotomy algorithm, the algorithm complexity is high, although a good effect is achieved in the aspect of bandwidth grooming, the calculation cost and the time cost are very high, and therefore the requirements of a new generation of communication technology on low time delay and low power consumption cannot be met. And with the current social information services, the user experience is easily influenced by the higher complexity.
The invention provides a dynamic connection method of an optical line terminal and an optical network unit, which is characterized in that the optical network unit with higher communication association degree is adjusted and deployed to the same optical line terminal based on a new algorithm, so that the algorithm complexity is greatly reduced while the same excellent flow bandwidth gain is obtained.
In one aspect, the present invention provides a dynamic connection method for an optical line terminal and an optical network unit, which is applicable to a plurality of optical line terminals and optical network units that are dynamically connected via an optical distribution network, wherein each optical line terminal and each optical network unit are connected to a software defined network controller (SDN controller), and the method is used for operating on the software defined network controller, and the method includes steps S101 to S104:
step S101: and acquiring a flow relation matrix among a plurality of optical network units to be connected at a set time point.
Step S102: in a deployment operation cycle, randomly acquiring an unconnected optical network unit to establish a to-be-connected optical network unit subset for connecting a set optical line terminal; and calculating the communication traffic of each unconnected optical network unit and the subset of the optical network units to be connected according to the traffic relation between the optical network units recorded in the traffic relation matrix, acquiring one of the rest unconnected optical network units with the largest communication traffic of the subset of the optical network units to be connected, adding the acquired one into the subset of the optical network units to be connected, and repeating the operation to add the optical network units with the set number into the subset of the optical network units to be connected.
Step S103: and continuously performing a plurality of deployment operation cycles based on the rest optical network units to respectively construct a corresponding optical network unit subset to be connected for each optical line terminal.
Step S104: and controlling each optical line terminal to respectively connect the optical network units in the sub-sets of the optical network units to be connected according to the sub-sets of the optical network units with the connection constructed by the plurality of deployment operation cycles.
In step S101, a dynamic deployment of the optical line terminal and the optical network unit is initiated at a set time point, where the set time may be determined according to a time requirement for network deployment in a specific scene, and may also be a condition for initiating dynamic deployment connection structure adjustment for ensuring transmission quality.
In some embodiments, the method further comprises: and continuously setting a plurality of set time points based on the first time interval, and re-acquiring the traffic relation matrix between the optical network units at each set time point for re-deploying the connection between each optical line terminal and the optical network units.
In this embodiment, each optical line terminal and the optical network unit are continuously relocated according to the first time interval, so as to continuously adapt to the change of the communication data transmission requirement in the operation process. The specific duration of the first time interval can be determined according to the change frequency and the computational power level of the communication demand under the actual application environment, wherein the lower the change frequency and/or the lower the computational power level, the longer the first time interval is, and the higher the change frequency and/or the higher the computational power level, the shorter the first time interval is.
In some embodiments, the method further comprises: collecting communication flow among the optical line terminals based on a second time interval, and calculating the sum of the communication flow among the optical line terminals at each time point; and if the sum of the communication flow is higher than the set threshold value, re-acquiring the flow relation matrix among the optical network units for re-deploying the connection between the optical line terminals and the optical network units.
In this embodiment, an objective of the present invention is to optimize a dynamic slicing algorithm of an ONU under a centralized flexible optical access network architecture with a background of centralized deployment of multiple OLTs, so as to reduce traffic transmitted from an optical line terminal to a metropolitan area network. That is, the communication demand between the optical line terminals is reduced, and therefore, the communication data traffic between the optical line terminals can be used as a judgment condition for determining whether to trigger the redeployment of the connection. Specifically, in this embodiment, the communication traffic between the optical line terminals is collected according to a second time interval, and a specific duration of the second time interval may be determined based on the change frequency and the calculated power level, where the lower the change frequency and/or the calculated power level is, the longer the second time interval is, and the higher the change frequency and/or the calculated power level is, the shorter the second time interval is.
In other embodiments, other conditions for initiating the redeployment connection may also be set, for example, the communication delay of the optical network units may be collected according to a third set interval duration, and if the communication delay is higher than the set value, the traffic relation matrix between the optical network units is obtained again to redeploy the connection between the optical line terminals and the optical network units.
In some embodiments, the traffic relation matrix is generated by counting, by the software-defined network controller, communication traffic of a plurality of optical network units inside each optical line terminal and communication traffic of a plurality of optical network units between each optical line terminal. Specifically, the OLT may count traffic information between the OLTs and traffic information inside the OLT through a router or a mac table, and report the traffic information to the software-defined network controller in real time or periodically, so that the software-defined network controller may obtain the traffic information of the access network, and then calculate a traffic matrix according to a traffic relation between the ONUs, for example, if the traffic between the ONU with the number i and the ONU with the number j is m, then E (i, j) is m.
In step S102 and step S103, referring to fig. 1, each optical line terminal needs to configure a relatively large number of optical network units, and therefore, each optical line terminal needs to repeat a deployment operation cycle once. Specifically, in one deployment operation cycle, the method can comprise the following steps 1-5:
1) initializing a subset of the optical network units carried by the first optical line terminal, and arbitrarily selecting one of all the unallocated optical network units to join the subset.
2) And respectively calculating the communication traffic between the residual unallocated optical network units and the subset according to the traffic relation matrix E, and selecting the optical network unit with the largest calculation result to add the optical network unit into the subset.
3) And repeating the step 2, and selecting the optical network unit with the maximum communication flow with the subset to be distributed to the subset of the optical line terminal each time until the number of the optical network units required by the optical line terminal reaches the set number.
4) Initializing the subset of the next optical line terminal to be distributed, randomly selecting an unallocated optical network unit to be added, and repeating the steps 2 and 3 to obtain the optical network unit.
5) And ending the algorithm until all the optical network units are distributed, namely all the optical line terminals are distributed.
Specifically, in steps S102 and S103 of this embodiment, in order to implement traffic localization of the clustered OLT, in the process of deployment and connection, the optical network units with higher communication association are deployed under the same optical line terminal, so that a large amount of external communication between the OLTs is converted into internal communication of the OLT, and the switching capability of the optical line terminal itself is fully utilized, thereby reducing transmission pressure between the optical line terminals, reducing the amount of data transmitted through the metropolitan area network, and reducing the communication delay to a certain extent. Meanwhile, in this embodiment, the number of the optical line terminals OLT and the number of the optical network units ONU are known, the communication traffic between the ONUs may be reported to the software-defined network controller by the OLT and quantized, and the software-defined network controller may arrange the obtained data information in a global angle, and perform overall processing on all the optical line terminals OLT and the optical network units ONU at the local end. On this basis, in the process of deploying the connection between the optical line terminal OLT and the optical network units ONU, for an OLT, the first connected ONU may randomly acquire and establish a subset, after the first ONU connected to the OLT is determined, the ONU connected to the OLT must calculate the communication traffic between each unconnected ONU and each ONU in the subset corresponding to the OLT according to the traffic relationship recorded in the traffic relationship matrix, and add the unconnected ONU with the largest communication traffic of the subset to the subset. And repeating the operation until the ONU connected with the OLT reaches the set number. Further, a subset of ONUs for deployment connection is established for each OLT in turn. The ONU with larger communication relation and more communication flow is arranged under the same OLT, and the internal data processing and interaction capacity of each OLT can be utilized to the maximum extent in the data processing process, so that the data transmitted by the metropolitan area network is reduced, and the pressure of a convergence side is reduced.
In step S104, the optical network units to be connected of each optical line terminal constructed in steps S102 and S103 may be deployed by connection through the optical distribution network. Specifically, in this embodiment, a flexible optical access network architecture may be introduced, a flexible ODN (the ODN is an FTTH optical cable network based on the PON device) may be constructed by introducing an optical connection matrix or an Arrayed Waveguide Grating (AWG), wavelengths from different OLTs may be distributed to different optical splitters under the action of the flexible ODN, and the ONUs may establish different but unique membership relationships with the OLTs by selecting a working wavelength, so that the problem of traffic localization in the architecture may be converted into a problem that each ONU allocates a wavelength to reduce the outbound traffic of the OLTs.
In some embodiments, in step S104, that is, controlling each optical line terminal to be connected to an optical network unit in a corresponding to-be-connected optical network unit subset includes: and acquiring the wavelength information of each optical line terminal, and sending the wavelength information of each optical line terminal to each optical network unit in the corresponding optical network unit subset to be connected so as to control each optical network unit to be switched to the corresponding wavelength and establish a membership relationship.
Specifically, based on the subset of the optical network units to be connected corresponding to each optical line terminal determined in steps S102 and S103, a network controller may be defined by software, that is, an SDN controller may control each ONU to adjust a working wavelength by issuing an instruction through the OLT, so as to implement connection deployment with the corresponding OLT.
In some embodiments, after step S104, that is, after controlling each optical line terminal to be connected to an optical network unit in a corresponding to-be-connected optical network unit subset, the method further includes: and generating a connection deployment log according to the optical network unit subset to be connected corresponding to each optical line terminal at the set moment.
In this embodiment, the deployment log is established to record the corresponding relationship between the OLT and the ONU which are connected for each deployment, so as to ensure the traceability of the connection state information, implement the traceability of the fault, and greatly improve the security of the device connection.
On the other hand, referring to fig. 2, the present invention further provides a system for dynamically connecting an optical line terminal and an optical network unit, including: the optical network unit is provided with a tunable laser. And the optical distribution network is used for dynamically connecting each optical network unit to each optical line terminal. And the software defined network controller is respectively connected with each optical line terminal and the optical distribution network and is used for executing the dynamic connection method of the optical line terminal and the optical network unit.
In this embodiment, the optical line terminal is used to provide an interface between the optical fiber access network and a service node on the network side, and communicates with one or more optical network units on the subscriber side through the optical distribution network. An optical network unit is a device of a fiber terminal in a fiber access network, which provides a plurality of service interfaces to a user. The tunable laser is a laser capable of continuously changing the output wavelength of laser within a certain range, and in this embodiment, the tunable laser is used to adjust the operating wavelength of the optical network unit, so as to connect the optical line terminal with a corresponding wavelength through the optical distribution network, so as to construct a unique membership relationship. In some embodiments, the optical distribution network is composed of a plurality of arrayed waveguide gratings, and flexible dynamic connection between the optical line terminal and the optical network unit is realized. The software defined network controller, namely the SDN controller, is respectively connected with each optical line terminal and the optical distribution network, on one hand, the communication data volume between each optical network unit is collected and counted, on the other hand, the flow relation matrix of each optical network unit is constructed, and the connection relation between each optical line terminal and each optical network unit is deployed based on the flow relation matrix, so that the optical network units with more communication are arranged under the same optical line terminal, and the internal processing capacity of the optical line terminal is fully utilized. The specific implementation steps can be described with reference to steps S101 to S104.
In another aspect, the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described above.
In another aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method.
The invention is illustrated in detail below with reference to an example:
a network structure based on OLT clustering deployment comprises: the optical network unit comprises a plurality of optical line terminals OLT and a plurality of optical network units ONU, wherein the optical network units are provided with tunable lasers. And the optical distribution network is used for dynamically connecting each optical network unit to each optical line terminal. And the software defined network controller is respectively connected with each optical line terminal and the optical distribution network. As shown in fig. 2, the optical line terminal OLT is connected to the optical network units ONU by leading the ODN and the optical splitter, the optical line terminal OLT is further connected to the metropolitan area network by the core router, and the SDN software defines the network controller to be respectively connected to each optical line terminal OLT and each optical network unit ONU.
The parameters mainly involved in this embodiment include: n is the number of the total ONU; m is the number of total OLTs; k is the number K of the ONU subordinate to each OLT. And E is a flow relation matrix between the ONUs. A matrix of N rows and N columns, the rows and columns being the ONU numbers, each element E (i, j) in the matrix representing an ONUiAnd ONUjTraffic flow between. E (i, j) ═ E (j, i). GiA set of ONUs assigned to the ith OLT. Wherein N ═ M × K.
The present embodiment runs on a software defined network controller under a centralized flexible optical access network architecture, i.e. on an SDN controller.
As shown in fig. 1, the specific implementation steps of this embodiment include steps 1 to 6:
1. firstly, an SDN controller counts a traffic relation matrix E of services between current ONUs in the whole network.
2. After the information acquisition is completed, the allocation algorithm is started to be executed, and the SDN controller initializes the subset G of the ONU carried by the first OLT1(initially empty set), one is arbitrarily selected among all unallocated ONUs and added to the subset. Indicating that the ONU has been assigned to the OLT.
3. And then the SDN controller extracts a sub-matrix according to the flow relation matrix E and the distribution condition of the ONU, wherein each row of the sub-matrix is the number of each ONU in the subset, the sub-matrix is the number of all the remaining unallocated ONUs, each row of the sub-matrix is summed, and the ONU corresponding to the maximum result is selected from the obtained calculation results and added into the subset. Indicating that the ONU is assigned to the OLT.
4. And repeating the step 3, and selecting the ONU with the maximum association with the OLT subset from the rest ONUs to be distributed under the OLT each time until the number of the ONUs under the OLT meets the requirement, namely the number of the ONUs under the OLT is K. And when the current OLT is completely allocated, starting to allocate the subordinate ONU for the next OLT. The two steps of 3 and 4 can ensure that the K ONUs with the maximum association are allocated to the same OLT, so that the flow rate under the OLT is the maximum under the current situation, and the information exchange capability of the OLT can be fully utilized.
Step 5, the SDN controller allocates for the next OLT, the sub-set G of the OLT is initialized firstiRandomly selecting an unallocated ONU to join the ONU, and then repeating the steps 3 and 4.
6. And ending the algorithm until all ONU allocation is completed, namely all OLT allocation is completed.
And then the SDN controller generates a notification message according to the result of the algorithm distribution and the information of the currently used wavelength of each OLT, and sends the notification message to each ONU to inform the ONU of the wavelength to which the ONU needs to be switched. And after the configuration of each ONU is finished, performing subsequent operation.
In order to verify that in real life, the traffic gain obtained by the embodiment can obtain a traffic gain substantially equal to that of the proposed algorithm, based on an end-to-end communication model, the traffic gains of the two algorithms are subjected to simulation verification on a BA scale-free network in which the network traffic distribution conforms to the power law distribution. Since the number of OLTs deployed is operator controlled in practical scenarios and is typically already deployed, take 8 OLTs as an example. Because the relation between the ONUs, that is, the relation between network nodes often presents the characteristic of aggregation in reality, and the influence of the characteristic is considered, the average clustering coefficient is controlled to be 0.4 in the BA network generation process.
The traffic volume of each communication link is generated by adopting Poisson distribution (Poisson distribution) in consideration of the arrival time and the number of users of real users. In view of the different user rates in different periods, experiments were performed with user arrival rate values of 20, 40, 60, 80, 100, respectively. Meanwhile, since the number of ONUs under the same OLT is different depending on the different manufacturers of the OLT, the number of ONUs may be different for the same number of OLTs, and experiments were conducted with the number of ONUs being 8 to 96 (step size of 8). And the results are summarized and compared.
As shown in fig. 3, the abscissa in the figure is the number of ONUs, and the ordinate is the inter-OLT traffic after the algorithm has been run. Curves with different shape points represent different user arrival rates. The lines of the algorithm of the present embodiment are shown by dotted lines, and the graph of the existing algorithm is shown by dashed lines. It can be seen that, under the experimental condition that the number of the OLTs is 8, and the same user arrival speed and the number of the ONUs are the same, the inter-OLT traffic obtained after the algorithm of the present embodiment and the existing algorithm are operated is substantially the same. The feasibility of the algorithm of the embodiment is proved through true simulation verification, and the experimental result shows that the gain obtained by the algorithm of the embodiment in the practical application is basically equal to that of the existing algorithm, and the algorithm of the embodiment has lower complexity through calculation. More computing resources can be saved in practical application.
The algorithm has the advantages that on the premise of ensuring that the flow transmitted into the metropolitan area network each time is minimum, lower algorithm complexity is obtained, the algorithm complexity is evaluated through iteration times, as can be seen from the algorithm, the flow of the algorithm comprises two steps of iteration, the total iteration times are the sum of the OLTs multiplied by the average number of the ONUs subordinate to each OLT, and the ONUs with the maximum traffic between the ONTs are ensured to be simultaneously distributed to the same OLT each time, so that the total traffic required to be transmitted between the OLTs and the OLTs after the final complete distribution is ensured to be minimum, namely the traffic transmitted through the metropolitan area network is minimum. Therefore, in practical application, under the condition of ensuring the same traffic bandwidth gain, the computing resources can be greatly saved. The algorithm has high compatibility, and can add a plurality of judgment conditions of external factors, such as factors of switching time delay and the like. And the algorithm can be used after most flexible dynamic allocation flow scenes are properly changed, and the application range is wide.
In summary, in the method, the system and the apparatus for dynamically connecting the optical line terminal and the optical network units, the method deploys the optical network units with larger association in the communication process under the same optical line terminal based on the traffic relationship matrix between the optical network units, so as to fully utilize the exchange capability of the optical line terminal, reduce data interaction between different optical line terminals, reduce the network pressure on the convergence side, reduce the pressure on the metropolitan area network, reduce the algorithm complexity while obtaining higher traffic gain, and improve the deployment response rate.
Those of ordinary skill in the art will appreciate that the various illustrative components, systems, and methods described in connection with the embodiments disclosed herein may be implemented as hardware, software, or combinations of both. Whether this is done in hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dynamic connection method of an optical line terminal and an optical network unit is characterized in that the method is suitable for a plurality of optical line terminals and optical network units which are dynamically connected through an optical distribution network, the optical network unit is provided with a tunable laser, each optical line terminal and the optical distribution network are connected with a software defined network controller, and the method comprises the following steps:
acquiring a flow relation matrix among a plurality of optical network units to be connected at a set time point;
in a deployment operation cycle, randomly acquiring an unconnected optical network unit to establish a to-be-connected optical network unit subset for connecting a set optical line terminal; calculating the communication flow of each unconnected optical network unit and the subset of the optical network units to be connected according to the flow relation between the optical network units recorded in the flow relation matrix, acquiring one of the rest unconnected optical network units with the largest communication flow of the subset of the optical network units to be connected and adding the obtained one into the subset of the optical network units to be connected, and repeating the operation to add the optical network units with the set number into the subset of the optical network units to be connected;
continuously performing a plurality of deployment operation cycles based on the remaining optical network units to respectively construct a corresponding optical network unit subset to be connected for each optical line terminal;
and controlling each optical line terminal to respectively connect the optical network units in the sub-sets of the optical network units to be connected according to the sub-sets of the optical network units with the connection constructed by the plurality of deployment operation cycles.
2. The method according to claim 1, wherein the method further comprises:
and continuously setting a plurality of the set time points based on the first time interval, and re-acquiring the traffic relation matrix between the optical network units at each set time point for re-deploying the connection between each optical line terminal and the optical network units.
3. The method according to claim 1, wherein the method further comprises:
collecting communication flow among the optical line terminals based on a second time interval, and calculating the sum of the communication flow among the optical line terminals at each time point;
and if the sum of the communication flow is higher than the set threshold value, re-acquiring the flow relation matrix among the optical network units for re-deploying the connection between the optical line terminals and the optical network units.
4. The method as claimed in claim 1, wherein controlling each olt to connect with an onu in a corresponding subset of onus, comprises:
and acquiring the wavelength information of each optical line terminal, and sending the wavelength information of each optical line terminal to each optical network unit in the corresponding optical network unit subset to be connected so as to control each optical network unit to be switched to the corresponding wavelength and establish a membership relationship.
5. The method according to claim 1, wherein the traffic relation matrix is generated by counting communication traffic of the plurality of onu within each olt and communication traffic of the plurality of onu between each olt through a software-defined network controller.
6. The method according to claim 1, wherein after controlling each olt to connect to the onu in the corresponding subset of onus, the method further comprises:
and generating a connection deployment log according to the optical network unit subset to be connected corresponding to each optical line terminal at the set moment.
7. A dynamic connection system of an optical line terminal and an optical network unit is characterized by comprising:
the optical network unit is provided with a tunable laser;
the optical distribution network is used for dynamically connecting each optical network unit to each optical line terminal;
a software-defined network controller, respectively connected to each olt and an optical distribution network, for executing the method of dynamically connecting an olt and an onu according to any one of claims 1 to 6.
8. The system according to claim 7, wherein the optical distribution network comprises a plurality of arrayed waveguide gratings.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 6 are implemented when the processor executes the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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