CN110035334A - A kind of power telecom network dynamically bandwidth resource optimization method - Google Patents

Abstract

The present application discloses a dynamic bandwidth resource optimization method for a power communication network, which is suitable for a distribution network communication system. The method includes: Step 1: Allocate optical lines according to resource authorization applications of a metropolitan area network controller and an access network controller. The first bandwidth of the terminal and the second bandwidth of the optical network unit; Step 2, according to the variable polling period, detect the real-time network traffic of the optical network unit included in the optical line terminal, and calculate the threshold factor of the optical network unit; Step 3, When it is determined that the threshold factor is equal to 0, a bandwidth optimization strategy of the distribution network communication system is generated according to the first bandwidth, the second bandwidth and the real-time network traffic, wherein the bandwidth optimization strategy includes the terminal bandwidth optimization strategy of the optical line terminal and the optical network unit. Cell bandwidth optimization strategy. The technical solution in the present application solves the problems of poor real-time performance and limitations of bandwidth allocation in the optical access network, and realizes real-time synchronization of bandwidth allocation and traffic changes.

Description

A method for optimizing dynamic bandwidth resources of power communication network

technical field

The present application relates to the technical field of power distribution network communication, and in particular, to a method for optimizing dynamic bandwidth resources of a power communication network.

Background technique

The distribution communication network is an important part of the smart grid construction of the State Grid Corporation of China. The construction of distribution business systems such as distribution automation, power quality detection, real-time detection of distribution transformers, and distributed energy access is widely carried out in various places, and the corresponding systems are promoted. The construction of the distribution network communication system basically forms the technical route of Ethernet passive optical network (EPON), industrial Ethernet, wireless and carrier composite networking, which effectively supports the operation of various intelligent power distribution services.

It is in this context that the emerging programmable centralized control technology is gradually accepted and recognized by the power system. The logically programmable centralized control plane can support flexible scheduling of power communication network resources; the flexible and open interface can support the on-demand invocation of its functions; the standard and unified southbound interface can realize the virtual transparency of equipment; and the network virtualization technology and software The combination of defined networks can also meet the isolation and security requirements of different departments and services. Through the integrated control and management of the physical network and the virtual network, an intelligent and agile distribution communication network can be realized, which is helpful to change the static status of the existing distribution communication network, and dynamic with the master station represented by the server field. The trend is consistent, effectively providing network support for power communication services, and further realizing the evolution of the power communication network in the direction of Information and Communication Technology (ICT).

In the prior art, when the distribution network communication uses the Optical Line Terminal (OLT) and the Optical Network Unit (Optical Network Unit, ONU) for cross-regional and cross-network data communication, the first problem to be solved is the traditional optical connection. The real-time performance of network access bandwidth allocation is poor and there are limitations, so that the allocation of network bandwidth can be synchronized with changes in traffic in real time.

SUMMARY OF THE INVENTION

The purpose of this application is to solve the problems of poor real-time performance and limitations of bandwidth allocation in optical access networks, and to realize real-time synchronization of bandwidth allocation and traffic changes.

The technical solution of the present application is to provide a dynamic bandwidth resource optimization method for a power communication network, which is suitable for a distribution network communication system, and the distribution network communication system includes at least one metropolitan area network controller, at least one An access network controller and at least two optical line terminals OLT, wherein any one optical line terminal is connected with at least two optical network units ONU, the dynamic bandwidth resource optimization method includes: Step 1, according to the metropolitan area network controller and The resource authorization application of the access network controller allocates the first bandwidth of the optical line terminal and the second bandwidth of the optical network unit; step 2, according to the variable polling period, detects the real-time network traffic of the optical network unit included in the optical line terminal , and calculate the threshold factor of the optical network unit; Step 3, when it is determined that the threshold factor is equal to 0, according to the first bandwidth, the second bandwidth and the real-time network traffic, generate a bandwidth optimization strategy for the distribution network communication system, wherein the bandwidth optimization strategy Including the terminal bandwidth optimization strategy of the optical line terminal and the unit bandwidth optimization strategy of the optical network unit.

In any of the above technical solutions, further, the calculation formula of the variable polling period is:

In the formula, C ₀ is the preset polling period, that is, the initial value of the variable polling period, e is a natural constant, P _m is the flow fluctuation parameter of the mth optical line terminal, and m is the number of the optical line terminal.

In any of the above technical solutions, further, the calculation formula of the threshold factor is:

In the formula, A _mn is the second bandwidth of the n-th optical network unit in the m-th optical line terminal, BT is the network load busy threshold, and P _mn is the flow fluctuation of the n-th optical network unit in the m-th optical line terminal. parameters, T _mn is the real-time network traffic of the n-th optical network unit in the m-th optical line terminal, and Av _mn is the threshold factor.

In any of the above technical solutions, further, generating a bandwidth optimization strategy, specifically including:

Step 31, according to the first bandwidth and real-time network traffic, calculate the idle bandwidth and value of the optical network unit whose threshold factor is not 0;

Step 32, calculate the second bandwidth optimization value of the optical network unit according to the idle bandwidth sum value and the second bandwidth, and generate the unit bandwidth optimization strategy according to the second bandwidth optimization value, wherein, the calculation formula of the second bandwidth optimization value is:

In the formula, A _in is the first bandwidth of the i-th optical line terminal, I _in is the idle bandwidth of the n-th optical network unit in the i-th optical line terminal, and the calculation formula of the idle bandwidth and value is:

In the formula, IT is the network load idle threshold, T _in is the real-time network traffic of the n-th optical network unit in the i-th optical line terminal, and P _in is the traffic fluctuation of the n-th optical network unit in the i-th optical line terminal. parameter,

B _ij is the bandwidth requirement of the j-th optical network unit with a threshold factor of 0 in the i-th optical line terminal, and the corresponding calculation formula is:

In the formula, BT is the network load busy threshold,

B′ _ij is the optimized bandwidth demand of the j-th optical network unit with a threshold factor of 0 in the i-th optical line terminal, and the corresponding calculation formula is:

In any of the above technical solutions, further, generating a bandwidth optimization strategy further includes: step 33, judging whether the optimized bandwidth demand _B'ij is greater than 0, if yes, go to step 34, if not, go to step 1;

Step 34, the access network controller sends the total uplink bandwidth increase request to the metropolitan area network controller, wherein the total uplink bandwidth increase request includes the optimized bandwidth demand B' _ij , real-time network traffic and traffic fluctuation parameters;

Step 35, according to the total upstream bandwidth increase request, calculate the upstream idle bandwidth and value of the remaining optical line terminals, and the corresponding calculation formula is:

In the formula, Im is the uplink idle bandwidth of the _m -th optical line terminal except the i-th optical line terminal, and Am is the first bandwidth of the _m -th optical line terminal except the i-th optical line terminal. , _Tm is the total flow of the mth access network controller, IT is the network load idle threshold, and _Pm is the flow fluctuation parameter of the mth optical line terminal;

Step 36: Calculate the first bandwidth optimization value of the optical line terminal according to the uplink idle bandwidth sum value and the first bandwidth of the optical line terminal, and generate a terminal bandwidth optimization strategy according to the first bandwidth optimization value, wherein the value of the first bandwidth optimization value is The calculation formula is:

In the formula, A' _m is the first bandwidth optimization value, and B' _ij is the bandwidth demand.

In any of the above technical solutions, further, the dynamic bandwidth resource optimization method further includes: Step 4, when it is determined that the optimized bandwidth demand _B'ij is greater than the uplink idle bandwidth sum value, the metropolitan area network controller sends the access The network controller sends the unit bandwidth verification request, and the access network controller calculates the second fairness factor of the optical network unit connected to it according to the unit bandwidth verification request, wherein the calculation formula of the second fairness factor _Fin is:

F _in =max{A′ _in -A _in ,0}, n=1,2,...,N, n≠j,

In the formula, A _in is the second bandwidth of the n-th optical network unit of the i-th optical line terminal, and A' _in is the corresponding second bandwidth optimization value;

Step 5, when it is determined that the second fairness factor is greater than 0, calculate the second restoration bandwidth value according to the second bandwidth optimization value and the second fairness factor, and generate a second bandwidth restoration instruction according to the second restoration bandwidth value, wherein the second The bandwidth recovery command is used to recover the bandwidth of the optical network unit, and the calculation formula of the second recovery bandwidth A″ _mn is:

In the formula, A _mn is the second bandwidth of the j-th optical network unit _in the i-th optical line terminal, and A'in is the second bandwidth of the optical network unit except the j-th optical network unit in the i-th optical line terminal. The bandwidth optimization value, A _in is the corresponding second bandwidth, and A' _mn is the second bandwidth optimization value of the nth optical network unit in the mth optical line terminal.

In any of the above technical solutions, further, before calculating the second restoration bandwidth value in step 5, it further includes: step 51, the metropolitan area network controller calculates the distribution network communication system according to the first bandwidth optimization value A' _m . The first fairness factor of the medium optical line terminal, where the calculation formula of the first fairness factor F _m is:

F _m =max{A′ _m -A _m , 0},

In the formula, A' _m is the first bandwidth optimization value of the m-th optical line terminal, and A _m is the first bandwidth corresponding to the m-th optical line terminal;

Step 52, determine whether the first fairness factor is equal to 0, if so, go to step 53, if not, calculate the second restoration bandwidth value;

Step 53: Calculate the first restoration bandwidth according to the first fairness factor and the first bandwidth optimization value, and generate a first bandwidth restoration instruction according to the first restoration bandwidth, where the first restoration bandwidth restoration instruction is used to restore the bandwidth of the optical line terminal , the calculation formula of the first recovery bandwidth A″ _m is:

In the formula, A′ _i is the first bandwidth optimization value of the i-th optical line terminal, and Im is the uplink idle bandwidth of the _m -th optical line terminal except the i-th optical line terminal.

The beneficial effects of the present application are: by detecting the real-time network traffic of each optical network unit according to the variable polling period, and based on the corresponding threshold factor, a bandwidth optimization strategy is generated, which solves the problem of poor real-time performance and existence of bandwidth allocation in the optical access network. Due to limitations, real-time synchronization of bandwidth allocation and traffic changes is achieved. By generating the unit bandwidth optimization strategy and the terminal bandwidth optimization strategy respectively, the bandwidth configuration of the optical network unit and the optical line terminal is dynamically optimized, and the problem of efficient utilization of the huge bandwidth resources of the optical access network is solved. Real-time optimization is required, network status is collected in real time, and network busy hotspots are predicted in advance, improving end-user experience.

In this application, by calculating the first fairness factor and the second fairness factor, a fairness recovery mechanism after bandwidth resource allocation is introduced to ensure the fairness of bandwidth allocation between optical network units and optical line terminals. The network management system greatly improves the utilization of bandwidth resources across regions.

Description of drawings

The advantages of the above and/or additional aspects of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic flowchart of a method for optimizing dynamic bandwidth resources of a power communication network according to an embodiment of the present application.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features of the embodiments may be combined with each other in the case of no conflict.

In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not subject to the following disclosure. Restrictions of specific embodiments.

As shown in FIG. 1 , this embodiment provides a method for optimizing dynamic bandwidth resources of an electric power communication network. The method for optimizing dynamic bandwidth resources is applicable to a distribution network communication system. The distribution network communication system includes at least one metropolitan area network controller. , at least one access network controller and at least two optical line terminals OLT, wherein any one optical line terminal is connected with at least two optical network unit ONUs, and the dynamic bandwidth resource optimization method includes:

Step 1, according to the resource authorization application of the metropolitan area network controller and the access network controller, allocate the first bandwidth of the optical line terminal and the second bandwidth of the optical network unit;

Specifically, the resource authorization application in the metropolitan area network controller and the access network controller initializes the bandwidth configuration of the OLT and the ONU to generate the first bandwidth and the second bandwidth. The resource authorization application in power communication generates the authorized bandwidth and initial bandwidth (first bandwidth and second bandwidth) of each terminal according to the Service-Level Agreement (SLA), and usually allocates the bandwidth according to a certain concurrency rate. The bandwidth is the bandwidth value promised to the user, and the initial bandwidth is converted according to a certain concurrency rate. Since the consumers of the access network traffic are people, and most of the network traffic such as data centers are consumed by machines, the power communication network When performing cross-regional data communication, there must be an imbalance of network load across regions.

Step 2, according to the variable polling period, detect the real-time network traffic of the optical network unit included in the optical line terminal, and calculate the threshold factor of the optical network unit;

Further, the calculation formula of the variable polling period is:

In the formula, C ₀ is the preset polling period, that is, the initial value of the variable polling period, e is a natural constant, P _m is the flow fluctuation parameter of the mth optical line terminal, and m is the number of the optical line terminal.

Specifically, after obtaining the first bandwidth and the second bandwidth, the access network controller polls the optical line terminals OLT ₁ to LOT _M according to the variable polling period C _m , and the value of the variable polling period C _m is fluctuated by the traffic The parameter P _m is determined, the larger the square value of the flow fluctuation parameter P _m , the smaller the value of the variable polling period C _m , the shorter the polling interval for the optical line terminal LOT _m , and the more accurate the data fluctuation is. The queue information of the OLT improves the prediction accuracy and the synchronization between the network traffic collected by the controller and the real traffic.

Further, the calculation formula of the threshold factor is:

In the formula, A _mn is the second bandwidth of the n-th optical network unit in the m-th optical line terminal, BT is the network load busy threshold, and P _mn is the flow fluctuation of the n-th optical network unit in the m-th optical line terminal. parameters, T _mn is the real-time network traffic of the n-th optical network unit in the m-th optical line terminal, and Av _mn is the threshold factor.

Specifically, a threshold factor Av _mn is defined to facilitate monitoring of the network load of the optical network unit. When the threshold factor of the optical network unit exceeds a certain threshold, it indicates that the corresponding optical network unit needs to be adjusted to adapt to the current Network data communication.

Step 3, when it is determined that the threshold factor is equal to 0, according to the first bandwidth, the second bandwidth and the real-time network traffic, a bandwidth optimization strategy of the distribution network communication system is generated, wherein the bandwidth optimization strategy includes the terminal bandwidth optimization strategy of the optical line terminal and the optical line terminal. Element bandwidth optimization strategy for network elements.

Further, generate a bandwidth optimization strategy, which specifically includes:

Step 31, according to the first bandwidth and real-time network traffic, calculate the idle bandwidth and value of the optical network unit whose threshold factor is not 0;

Specifically, the calculation formula for setting the idle bandwidth and value is:

In the formula, IT is the network load idle threshold, T _in is the real-time network traffic of the n-th optical network unit in the i-th optical line terminal, and P _in is the traffic fluctuation of the n-th optical network unit in the i-th optical line terminal. parameter, A _in is the first bandwidth of the i-th optical line terminal.

Step 32, calculate the second bandwidth optimization value of the optical network unit according to the idle bandwidth sum value and the second bandwidth, and generate the unit bandwidth optimization strategy according to the second bandwidth optimization value, wherein, the calculation formula of the second bandwidth optimization value is:

In the formula, A _in is the first bandwidth of the i-th optical line terminal, I _in is the idle bandwidth of the n-th optical network unit in the i-th optical line terminal, and B _ij is the threshold factor in the i-th optical line terminal: 0 is the bandwidth demand of the jth optical network unit, and B′ _ij is the optimized bandwidth demand of the jth optical network unit whose threshold factor is 0 in the ith optical line terminal.

Specifically, the calculation formula corresponding to the bandwidth demand B _ij of the j-th optical network unit in the i-th optical line terminal is set as:

In the formula, BT is the network load busy threshold, T _ij is the real-time network traffic of the corresponding network unit, A _ij is the real-time network traffic of the corresponding network unit, and the calculation formula corresponding to the bandwidth demand B′ _ij is:

In the formula, ∑I _in is the idle bandwidth and value,

To sum up, the second bandwidth optimization value _A'in corresponding to the unit bandwidth optimization strategy and the bandwidth requirement _B'ij after optimization can be calculated, so that the access network controller can obtain the second bandwidth optimization value A according to the ' _in configures the bandwidth of the optical network unit connected to it, and generates a unit bandwidth optimization strategy, wherein the bandwidth demand _B'ij is the bandwidth that the current ONU _ij still needs to adjust and increase, and is the trigger condition for bandwidth optimization of the optical line terminal. When the bandwidth demand _B'ij is greater than 0, the optical line terminal needs to be optimized, so as to generate a terminal optimization strategy.

Further, generating the bandwidth optimization strategy specifically includes:

Step 33, determine whether the optimized bandwidth demand _B'ij is greater than 0, if so, go to Step 34, if not, go to Step 1;

Step 34, the access network controller sends a request for increasing the total uplink bandwidth to the metropolitan area network controller, wherein the request for increasing the total uplink bandwidth includes the bandwidth demand B' _ij , real-time network traffic and traffic fluctuation parameters;

Step 35, according to the total upstream bandwidth increase request, calculate the upstream idle bandwidth and value of the remaining optical line terminals, and the corresponding calculation formula is:

In the formula, Im is the uplink idle bandwidth of the _m -th optical line terminal except the i-th optical line terminal, and Am is the first bandwidth of the _m -th optical line terminal except the i-th optical line terminal. , _Tm is the total flow of the mth access network controller, IT is the network load idle threshold, and _Pm is the flow fluctuation parameter of the mth optical line terminal;

Specifically, after receiving the bandwidth request, the metropolitan area network controller directly calculates the uplink idle bandwidth _Im of each idle optical line terminal OLT, and the method for calculating the uplink idle bandwidth _Im here is the same as the optimization of the optical network unit inside the optical line terminal OLT. The allocation of the upstream bandwidth of the optical line terminal OLT is actively allocated by the metropolitan area network controller. Instead of automatically adapting to changes in the upstream traffic to optimize the bandwidth configuration, the access network controller actively triggers the scheduling of bandwidth resources. Therefore, there is no polling. process, which is also determined by the characteristics of the metropolitan area network.

The total flow T _m of the access network controller and the flow fluctuation parameter P _m of the optical line terminal are obtained by the metropolitan area network controller through interaction with the access network controller, and the network flow information is collected by the access network controller according to A certain period of polling is implemented, and the metropolitan area network controller is only responsible for scheduling bandwidth resources between OLTs. The core idea of the global bandwidth optimization strategy is to take advantage of the imbalance of network traffic, schedule bandwidth resources across regions, transfer the network bandwidth in the idle area to the high-load area, realize the synchronization of bandwidth allocation and traffic distribution, and maximize the use of the entire network bandwidth. resource.

Step 36: Calculate the first bandwidth optimization value of the optical line terminal according to the uplink idle bandwidth sum value and the first bandwidth of the optical line terminal, and generate a terminal bandwidth optimization strategy according to the first bandwidth optimization value, wherein the value of the first bandwidth optimization value is The calculation formula is:

In the formula, A' _m is the first bandwidth optimization value, and B' _ij is the bandwidth demand.

Specifically, the metropolitan area network controller sorts according to the size of the uplink idle bandwidth _Im , and preferentially schedules the OLT with lower network load. The overall network load will not fluctuate greatly, but the load of ONU terminals fluctuates frequently. If the load in a certain area is the lowest, it means that the network will be idle for a period of time in the future. It is suitable to execute the scheduling policy in sequence according to the load intensity until meet bandwidth requirements.

After the metropolitan area network controller generates the terminal bandwidth optimization strategy according to the calculated first bandwidth optimization value _A'm , it performs bandwidth configuration, redistributes the total uplink bandwidth of the optical line terminal, and sends it to the access network controller, the access network The controller increases the allocated bandwidth of the OLT _i and the ONU _ij , and completes the optimization of the bandwidth resources according to the currently implemented network traffic.

In a high network load state, the focus is no longer on network utilization, but on the fairness of network resource allocation. From the logic of the OLT internal bandwidth optimization strategy and the global OLT bandwidth optimization strategy, it can be seen that it belongs to the active contention resource allocation method. That is, on a first-come-first-served basis, high-load terminals occupy the bandwidth of low-load terminals, which may cause unfair allocation. For example, terminal A has low network traffic for a period of time, and its allocated bandwidth is transferred to the high-load area, but it starts at a certain time. The traffic of terminal A increases, but the available bandwidth is not enough. At this time, the overall network load is very high. The bandwidth optimization strategy cannot transfer enough idle bandwidth to meet the needs of terminal A. Obviously, the available bandwidth of terminal A is much lower than its authorized bandwidth. This is also unacceptable for optical access network resource management. In order to ensure the fairness of bandwidth allocation, this paper proposes bandwidth recovery strategies, including global bandwidth recovery strategies and OLT internal bandwidth recovery strategies, to ensure that the terminal at least A bandwidth not lower than the initial value can be allocated.

Further, the dynamic bandwidth resource optimization method further includes: step 4, when it is determined that the optimized bandwidth demand _B'ij is greater than the uplink idle bandwidth sum value, the metropolitan area network controller sends a unit bandwidth verification request to the access network controller , the access network controller calculates the second fairness factor of the optical network unit connected to it according to the unit bandwidth verification request, wherein the calculation formula of the second fairness factor F _in is:

F _in =max{A′ _in -A _in ,0}, n=1,2,...,N, n≠j,

In the formula, A _in is the second bandwidth of the n-th optical network unit of the i-th optical line terminal, and A' _in is the corresponding second bandwidth optimization value;

Specifically, after receiving the bandwidth optimization policy, the access network controller optimizes the bandwidth of the optical network unit, and sets the fairness factor of the optical network unit, which is recorded as the second fairness factor, so that other devices under the same OLT can The ONU is forced to reduce the bandwidth allocation according to a certain proportion according to the fairness factor.

Step 5, when it is determined that the second fairness factor is greater than 0, calculate the second restoration bandwidth value according to the second bandwidth optimization value and the second fairness factor, and generate a second bandwidth restoration instruction according to the second restoration bandwidth value, wherein the second The bandwidth recovery command is used to recover the bandwidth of the optical network unit, and the calculation formula of the second recovery bandwidth A″ _mn is:

In the formula, A _mn is the second bandwidth of the j-th optical network unit _in the i-th optical line terminal, and A'in is the second bandwidth of the optical network unit except the j-th optical network unit in the i-th optical line terminal. The bandwidth optimization value, A _in is the corresponding second bandwidth, and A' _mn is the second bandwidth optimization value of the nth optical network unit in the mth optical line terminal.

Specifically, the optical line terminal optimizes the bandwidth of the optical network unit it is responsible for according to the received bandwidth optimization strategy, and when it is determined that the second fairness factor corresponding to any optical network unit is greater than 0, it indicates that the optical network unit occupies Larger bandwidth, at this time, the optical line terminal calculates the corresponding second recovery bandwidth A" _mn according to the calculation formula of the second bandwidth A" _mn , and restores the bandwidth of the optical network unit. According to the second fairness factor, press A certain proportion of the bandwidth allocation is forcibly reduced to solve the fairness of the bandwidth allocation of the network as a whole under high load conditions.

Preferably, before calculating the second restoration bandwidth value in step 5, the method further includes:

Step 51, the metropolitan area network controller calculates the first fairness factor of the optical line terminal in the distribution network communication system according to the first bandwidth optimization value A' _m , wherein the calculation formula of the first fairness factor F _m is:

F _m =max{A′ _m -A _m , 0},

In the formula, A' _m is the first bandwidth optimization value of the m-th optical line terminal, and A _m is the first bandwidth corresponding to the m-th optical line terminal;

Step 52, determine whether the first fairness factor is equal to 0, if so, go to step 53, if not, calculate the second restoration bandwidth value;

Step 53: Calculate the first restoration bandwidth according to the first fairness factor and the first bandwidth optimization value, and generate a first bandwidth restoration instruction according to the first restoration bandwidth, where the first restoration bandwidth restoration instruction is used to restore the bandwidth of the optical line terminal , the calculation formula of the first recovery bandwidth A″ _m is:

In the formula, A′ _i is the first bandwidth optimization value of the i-th optical line terminal, and Im is the uplink idle bandwidth of the _m -th optical line terminal except the i-th optical line terminal.

Specifically, before the bandwidth recovery is performed on the optical network unit, in order to reduce the interaction of control signaling and ensure that the network load fluctuation in a certain area is relatively consistent, the first fairness factor F _m of the optical line terminal is set. The total uplink bandwidth of the terminal is restored. When the first fairness factor F _m is equal to 0, it indicates that the total uplink bandwidth occupied by the corresponding optical line terminal is smaller than the initial allocation value (the first bandwidth), therefore, the optical line terminal needs to be restored to ensure that the optical line terminal First revert to the initial assigned value.

The metropolitan area network control first sorts _m according to the fairness factor F _m from large to small, and preferentially reduces the total upstream bandwidth of the OLT with the most unfair allocation. Once the bandwidth A" _m is restored, finally, the metropolitan area network controller generates a first bandwidth restoration instruction according to the first restored bandwidth A" _m , and sends it to the access network controller to reconfigure the total uplink bandwidth of the optical line terminal, In order to facilitate the total optical line segment to perform bandwidth configuration on the optical network unit according to the updated total uplink bandwidth and the unmet demand bandwidth B″′ _ij , to reduce the interaction of control signaling, and to ensure that the network load fluctuation in a certain area is relatively low. Consistent.

The technical solution of the present application is described in detail above with reference to the accompanying drawings. The present application proposes a method for optimizing dynamic bandwidth resources of a power communication network, which is suitable for a communication system of a power distribution network. The method includes: Step 1, according to the MAN controller and The resource authorization application of the access network controller allocates the first bandwidth of the optical line terminal and the second bandwidth of the optical network unit; step 2, detects the real-time network traffic of the optical network unit included in the optical line terminal according to the variable polling period , and calculate the threshold factor of the optical network unit; Step 3, when it is determined that the threshold factor is equal to 0, according to the first bandwidth, the second bandwidth and the real-time network traffic, generate a bandwidth optimization strategy for the distribution network communication system, wherein the bandwidth optimization strategy Including the terminal bandwidth optimization strategy of the optical line terminal and the unit bandwidth optimization strategy of the optical network unit. The technical solution in the present application solves the problems of poor real-time performance and limitations of bandwidth allocation in the optical access network, and realizes real-time synchronization of bandwidth allocation and traffic changes.

The steps in this application can be adjusted, combined and deleted in sequence according to actual needs.

The units in the device of the present application can be combined, divided and deleted according to actual needs.

Although the present application has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and are not intended to limit the application of the present application. The protection scope of the present application is defined by the appended claims, and can include various modifications, alterations and equivalent solutions for the invention without departing from the protection scope and spirit of the present application.

Claims (7)

1. A method for optimizing dynamic bandwidth resources of an electric power communication network, characterized in that, the method for optimizing dynamic bandwidth resources is applicable to a distribution network communication system, wherein the distribution network communication system includes at least one metropolitan area network controller, at least one An access network controller and at least two optical line terminals OLT, wherein any one of the optical line terminals is connected to at least two optical network units ONU, and the dynamic bandwidth resource optimization method includes: Step 1: Allocate the first bandwidth of the optical line terminal and the second bandwidth of the optical network unit according to the resource authorization application of the metropolitan area network controller and the access network controller; Step 2, according to the variable polling period, detect the real-time network traffic of the optical network unit included in the optical line terminal, and calculate the threshold factor of the optical network unit; Step 3, when it is determined that the threshold factor is equal to 0, according to the first bandwidth, the second bandwidth and the real-time network traffic, generate a bandwidth optimization strategy for the distribution network communication system, wherein the The bandwidth optimization strategy includes a terminal bandwidth optimization strategy of the optical line terminal and a unit bandwidth optimization strategy of the optical network unit. 2. The power communication network dynamic bandwidth resource optimization method according to claim 1, wherein the calculation formula of the variable polling period is: In the formula, C ₀ is the preset polling period, that is, the initial value of the variable polling period, e is a natural constant, P _m is the flow fluctuation parameter of the mth optical line terminal, and m is the number of the optical line terminal. . 3. The power communication network dynamic bandwidth resource optimization method according to claim 1, wherein the calculation formula of the threshold factor is: In the formula, A _mn is the second bandwidth of the n-th optical network unit in the m-th optical line terminal, BT is the network load busy threshold, and P _mn is the n-th optical line terminal in the m-th optical line terminal. The traffic fluctuation parameter of the optical network unit, T _mn is the real-time network traffic of the n-th optical network unit in the m-th optical line terminal, and Av _mn is the threshold factor. 4. The method for optimizing dynamic bandwidth resources of a power communication network according to claim 1, wherein generating the bandwidth optimization strategy specifically comprises: Step 31, according to the first bandwidth and the real-time network traffic, calculate the idle bandwidth and value of the optical network unit whose threshold factor is not 0; Step 32: Calculate the second bandwidth optimization value of the optical network unit according to the idle bandwidth sum value and the second bandwidth, and generate the unit bandwidth optimization strategy according to the second bandwidth optimization value, wherein, The calculation formula of the second bandwidth optimization value is: In the formula, A _in is the first bandwidth of the i-th optical line terminal, I _in is the idle bandwidth of the n-th optical network unit in the i-th optical line terminal, and B _ij is the threshold value described in the i-th optical line terminal The bandwidth requirement of the j-th optical network unit whose factor is 0, and B′ _ij is the optimized bandwidth requirement of the j-th optical network unit whose threshold factor is 0 in the i-th optical line terminal. 5. The method for optimizing dynamic bandwidth resources of a power communication network according to claim 4, wherein generating the bandwidth optimization strategy further comprises: Step 33, determine whether the optimized bandwidth demand _B'ij is greater than 0, if so, go to Step 34, if not, go to Step 1; Step 34, the access network controller sends the total uplink bandwidth increase request to the metropolitan area network controller, wherein the total uplink bandwidth increase request includes the optimized bandwidth demand B' _ij , the real-time network traffic and said traffic fluctuation parameters; Step 35, according to the increase request of the total uplink bandwidth, calculate the uplink idle bandwidth and value of the remaining optical line terminals, and the corresponding calculation formula is: In the formula, Im is the uplink idle bandwidth of the _m -th optical line terminal except the i-th optical line terminal, and Am is the first bandwidth of the _m -th optical line terminal except the i-th optical line terminal. , _Tm is the total flow of the mth access network controller, IT is the network load idle threshold, and _Pm is the flow fluctuation parameter of the mth optical line terminal; Step 36: Calculate the first bandwidth optimization value of the optical line terminal according to the uplink idle bandwidth sum value and the first bandwidth of the optical line terminal, and generate the first bandwidth optimization value according to the first bandwidth optimization value. Terminal bandwidth optimization strategy, wherein the calculation formula of the first bandwidth optimization value is: In the formula, A' _m is the first bandwidth optimization value, and B' _ij is the bandwidth demand. 6. The method for optimizing dynamic bandwidth resources of a power communication network according to claim 5, wherein the method for optimizing dynamic bandwidth resources further comprises: Step 4, when it is determined that the optimized bandwidth demand _B'ij is greater than the sum of the uplink idle bandwidth, the metropolitan area network controller sends a unit bandwidth verification request to the access network controller, and the access network controller sends a unit bandwidth verification request. The network access controller calculates the second fairness factor of the optical network unit connected thereto according to the unit bandwidth verification request, wherein the calculation formula of the second fairness factor F _in is: F _in =max{A′ _in -A _in ,0}, n=1,2,...,N, n≠j, In the formula, A _in is the second bandwidth of the n-th optical network unit of the i-th optical line terminal, and A' _in is the corresponding second bandwidth optimization value; Step 5, when it is determined that the second fairness factor is greater than 0, calculate a second restoration bandwidth value according to the second bandwidth optimization value and the second fairness factor, and generate a second restoration bandwidth value according to the second restoration bandwidth value. Bandwidth recovery instruction, wherein, the second bandwidth recovery instruction is used to recover the bandwidth of the optical network unit, and the calculation formula of the second recovery bandwidth A″ _mn is: In the formula, A _mn is the second bandwidth of the j-th optical network unit _in the i-th optical line terminal, and A'in is the second bandwidth of the optical network unit except the j-th optical network unit in the i-th optical line terminal. The bandwidth optimization value, A _in is the corresponding second bandwidth, and A' _mn is the second bandwidth optimization value of the nth optical network unit in the mth optical line terminal. 7. The method for optimizing dynamic bandwidth resources of a power communication network according to claim 6, wherein before calculating the second restoration bandwidth value in step 5, the method further comprises: Step 51, the metropolitan area network controller calculates the first fairness factor of the optical line terminal in the distribution network communication system according to the first bandwidth optimization value A' _m , wherein the first fairness factor The formula for calculating _Fm is: F _m =max{A′ _m -A _m , 0}, In the formula, A' _m is the first bandwidth optimization value of the m-th optical line terminal, and A _m is the first bandwidth corresponding to the m-th optical line terminal; Step 52, determine whether the first fairness factor is equal to 0, if so, go to step 53, if not, calculate the second restoration bandwidth value; Step 53: Calculate a first restoration bandwidth according to the first fairness factor and the first bandwidth optimization value, and generate a first bandwidth restoration instruction according to the first restoration bandwidth, wherein the first restoration bandwidth restoration instruction For recovering the bandwidth of the optical line terminal, the calculation formula of the first recovery bandwidth A″ _m is: In the formula, A′ _i is the first bandwidth optimization value of the i-th optical line terminal, and Im is the uplink idle bandwidth of the _m -th optical line terminal except the i-th optical line terminal.