CN108063688A - Communicate maintaining method and device - Google Patents

Abstract

Embodiments of the present invention provide a communication maintenance method and device, so as to optimize service paths and improve communication reliability. The method includes: determining a service path between target paired devices; calculating the availability of the service path; wherein, the availability of the service path is used to characterize the probability that the service path can work normally; the service path includes at least one level of sub-paths, and the service path Availability is calculated based on the availability of each sub-path in the service path, and the availability of the sub-path is used to represent the probability that the sub-path can work normally; according to the availability of the service path, the operation and maintenance of the service path between the target paired devices is performed. In the embodiment of the present invention, operation and maintenance are performed based on the availability of service paths, so that service paths with operational risks in the network can be predicted in advance, and more targeted operation and maintenance measures are taken, thereby improving risk judgment and optimizing A business path, and improve communication reliability.

Description

Communication maintenance method and device

technical field

The present invention relates to the technical field of communication, in particular to a communication maintenance method and device.

Background technique

At present, many communication transmission networks support point-to-point business communication. Taking the power communication transmission network as an example, it carries the point-to-point communication service between two paired relay protection devices and two security control devices in power grid production (hereinafter referred to as point-to-point service).

More specifically, in the power communication transmission network, in order to realize point-to-point communication between two paired devices, a service path (point-to-point service channel) will be opened. The service path needs to be reliable and stable to support the normal operation of point-to-point communication services.

Contents of the invention

In view of this, the embodiments of the present invention provide a communication maintenance method and device, so as to optimize service paths and improve communication reliability.

In order to achieve the above purpose, embodiments of the present invention provide the following technical solutions:

A communication maintenance method, comprising:

Determine the traffic path between target paired devices;

calculating the availability of the service path; wherein, the availability of the service path is used to characterize the probability that the service path can work normally; the service path includes at least one level of sub-paths, and the availability of the service path is based on the service The availability of each sub-path in the path is calculated, and the availability of the sub-path is used to represent the probability that the sub-path can work normally;

According to the availability of the service path, perform operation and maintenance on the service path between the target paired devices.

A communication maintenance device, comprising:

a determining unit, configured to determine a service path between target paired devices;

An availability calculation unit, configured to calculate the availability of the service path; wherein, the availability of the service path is used to characterize the probability that the service path can work normally; the service path includes at least one level of sub-paths, and the service path The availability of is calculated according to the availability of each sub-path in the service path, and the availability of the sub-path is used to represent the probability that the sub-path can work normally;

The operation and maintenance unit is configured to perform operation and maintenance on the service path between the target paired devices according to the path availability of the service path.

It can be seen that in the embodiment of the present invention, the availability of service paths can be calculated, and based on the availability of service paths, operation and maintenance can be performed, so that service paths with operational risks in the network can be predicted in advance, and more targeted operation and maintenance measures can be taken , thereby improving the judgment of risks, optimizing a service path, and improving communication reliability.

Description of drawings

FIG. 1 is an example diagram of a communication mode model provided by an embodiment of the present invention;

Fig. 2 is the SDH ring network topology example diagram that the embodiment of the present invention provides;

FIG. 3 is an exemplary structural diagram of a communication maintenance device provided by an embodiment of the present invention;

FIG. 4 is an exemplary flowchart of a communication maintenance method provided by an embodiment of the present invention;

Figure 5a-Figure 6b is an example diagram of the topology structure of the service path provided by the embodiment of the present invention;

FIG. 7a-FIG. 7b are example diagrams of the topology structure of the transmission network element provided by the embodiment of the present invention;

FIG. 8 is an example diagram of a cycle process provided by an embodiment of the present invention;

FIG. 9 is an example of an existing channel arrangement policy model.

Detailed ways

First introduce the terms or acronyms involved in this article as follows:

Power communication transmission network: The power communication transmission network is a dedicated communication network that mainly serves the power production and dispatch business. It is a network system that connects transmission equipment and communication optical fibers through various communication protocols, communication technologies and specific operating modes. ;

Point-to-point service: refers to the point-to-point communication between two paired devices. The point-to-point business is only related to two business nodes. In the field of power communication, two business nodes are connected through the power communication transmission network. For example, in the power backbone communication transmission network, services such as protection, security control, dispatch exchange, administrative exchange, and video conference all use point-to-point communication. Taking the protection service as an example, the communication mode model is shown in Figure 1: In this paper Point-to-point communication between the end protection device and the opposite end protection device through the power communication transmission network;

Point-to-point service channel: a service path opened for point-to-point communication between two paired devices;

MTBF: Mean Time Between Failure, the average time between failures, the average time interval between two failures of a point-to-point service channel;

MTTR: Mean Time To Restoration, the average fault recovery time, the average repair time required for point-to-point service channel failures;

SDH: Synchronous DigitalHierarchy, synchronous digital system;

SDH network: a communication transmission network using a synchronous digital system mechanism, and the power communication transmission network is mainly composed of an SDH network;

SDH ring: A topology structure of SDH network, which is a ring network structure connected by transmission equipment and communication optical fiber, so that any network element node (transmission equipment) on the network has two reachable channels . The network topology of the SDH ring is shown in Figure 2. In Figure 2, transmission equipment 1 can reach transmission equipment 3 through transmission equipment 2, and can also reach transmission equipment 3 through transmission equipment 4.

Embodiments of the present invention provide a communication maintenance method and device, so as to optimize service paths and improve communication reliability.

The above-mentioned communication maintenance method and device are applicable to any application scenario requiring point-to-point communication, and its core idea is to perform operation and maintenance based on the availability of service paths.

After introducing the core idea, the communication maintenance device involved in the embodiment of the present invention is introduced below.

Fig. 3 shows an exemplary structure of the above-mentioned communication maintenance device including: a determination unit 31, an availability calculation unit 32, and an operation and maintenance unit 33, wherein the determination unit 31 can be used to determine the service path between the target paired devices, and the availability The calculation unit 32 can be used to calculate the availability of the service path, and the operation and maintenance unit 33 can be used to operate and maintain the service path between the target paired devices according to the path availability of the service path. This article will introduce the functions of each unit in combination with the communication maintenance method later. .

Figure 4 shows an exemplary flow of a communication maintenance method, which may at least include the following steps:

Part 400: Determine each traffic path between the target paired equipment;

The above-mentioned target paired device can be any pair of two devices that need communication maintenance, and the service path refers to the point-to-point communication channel between the target paired device.

The service path between each paired equipment can be stored, so that each service path between the target paired equipment can be determined conveniently.

In an example, part 400 may be performed by the aforementioned determination unit 31 .

It should be noted that when the service path is initially assigned to the target paired device, the best one or more service paths can be allocated to the target paired device according to the current availability of the service path, and then periodically (for example, once a month) Communication maintenance is performed or under certain triggers. During the communication maintenance process, steps 400-402 provided in this embodiment can be performed.

Section 401: Calculate the availability of each service path.

In one example, part 401 may be executed by the aforementioned availability calculation unit 32 .

The availability of a service path is used to characterize the probability that the service path can work normally.

As mentioned above, the power transmission network is composed of SDH network, and SDH network can also be nested in SDH network. Therefore, a service path can be composed of multiple sub-paths, and there may be sub-paths under each sub-path.

In many cases, a business path contains multi-level sub-paths, and the availability of the business path can be calculated according to the availability of each sub-path (the availability of the sub-path is used to represent the probability that the sub-path can work normally), and this article will introduce How availability is calculated.

Part 402: According to the availability of each service path, perform operation and maintenance on the service paths between target paired devices.

In an example, part 402 may be executed by the aforementioned operation and maintenance unit 33 .

It can be seen that in the embodiment of the present invention, the availability of each service path can be calculated, and operation and maintenance can be performed based on the availability of the service path, so that the service paths with operational risks in the network can be predicted in advance, and more targeted operations can be adopted. Maintenance measures, thereby improving the judgment of risks, optimizing a business path, and improving communication reliability.

The following will focus on how to calculate the availability of business paths.

First, introduce the topology structure of each service path:

The transmission network elements involved in the service path include transmission equipment and optical fibers.

Figures 5a-5c simply show the connection relationship between transmission network elements:

In Figure 5a, the transmission network elements (D1-D4) between the target paired devices (A and B represent the target paired devices) are connected in series to form a serial system; the operation of the serial system is based on the The premise is that all network elements are running. As long as one transmission network element fails, the entire system cannot operate normally. In the SDH optical transmission network, if route protection is not considered, an end-to-end circuit provided for a site can be regarded as a series of multiple transmission network elements/channels. When a transmission network element/channel fails, the service of the entire circuit is interrupted.

In Fig. 5b, the transmission network elements (D1-Dx) are connected in parallel to form a parallel system. In the parallel system, as long as one transmission network element works normally, the whole system can work. In the SDH self-healing ring network protection mode, route protection is considered. When a transmission network element/channel fails at the service route summary, the system automatically switches the service to the protection channel without affecting service transmission.

In Figure 5c, the transmission network elements (D1-D4) form a series-parallel hybrid system, which is also the most commonly encountered topology in practice. When a service path passes through multiple SDH rings, each SDH ring has its own When the protection mechanism is used, at this time, the protection channel and the working route constitute a serial-parallel hybrid system.

As shown in Figure 5d, the transmission network element in Figure 5c can be divided into two level 1 sub-paths (indicated by L ₁ 1 and L ₁ 2, the subscript indicates the number of levels), and the service path can be considered as a level 0 sub-path , the relationship between these two level 1 subpaths is in series, and its internal topology is shown in Figure 7a.

It can be considered that the transmission network elements contained in the above two first-level sub-paths are second-level sub-paths, and the service path shown in FIG. 5c can be considered to include two-level sub-paths.

Of course, the actual situation may be more complicated. For example, in the service path shown in Figure 6a, its transmission network elements can be divided into three topological relationships: three first-level sub-paths— _{L 1} 1-L ₁ 3, where L ₁ 1. There is a serial relationship between L ₁ 2 and L ₁ 3 (no other relationship);

The internal topology of L ₁ 2 and L ₁ 3 is a purely parallel structure. Since the internal topology of L ₁ 2 and L ₁ 3 is already in a pure series or parallel relationship, the transmission network elements it contains are level 2 subpath;

And L ₁ 1 can be further divided into three second-level sub-paths— _{L 2} 1-L ₂ 3, and there is a single parallel relationship between L ₂ 1-L ₂ 3;

Next, look at L ₂ 1-L ₂ 3. The internal topology of L ₂ 3 is a simple series structure as shown in Figure 7b. For L ₂ 1 and L ₂ 2, please refer to Figure 6b. Taking L ₂ 1 as an example, It can be further divided into two third-level sub-paths— _{L 3} 1 and L ₃ 2 (L ₃ 1 and L ₃ 2 are in a single series relationship), and the internal topology of L ₃ 1 and L ₃ 2 is shown in Figure 7a Show.

It should be noted that the transmission network elements included in L ₃ 1 and L ₃ 2 can be considered as the last level of sub-paths, and the service path shown in Figure 6a contains 4 levels of sub-paths in total.

Therefore, in this embodiment, the topology structure of the service path may include at least one level of sub-paths, the last level of sub-paths is the transmission network element, and the service path may be regarded as the 0th level of sub-paths.

Then, how to calculate the availability of a service path with multiple levels of sub-paths?

It can be obtained by calculating availability step by step from bottom to top:

Assuming that the service path includes 1st to Nth-level sub-paths, the availability of the N-th-level sub-path can be calculated first, and then the availability of the N-1-level sub-path can be calculated based on the availability of the N-th level sub-path, and so on.

Taking Figure 6a as an example, the service path includes sub-paths of levels 1-4, and the sub-paths of level 4 are transmission network elements, and the availability of each transmission network element can be calculated first (this article will introduce in detail how to calculate the availability of transmission network elements);

Next, the availability of the third-level sub-paths (such as _L31 and _L32 ) can be calculated according to the connection relationship between the fourth-level sub-paths and the availability of the fourth-level sub-paths;

The availability of the second-level sub-path (such as L ₂ 1) can be calculated according to the connection relationship between L ₃ 1 and L ₃ 2 and their availability;

The availability of the first-level sub-path, taking L ₁ 1 as an example, can be calculated according to the connection relationship between L ₂ 1-L ₂ 3 and its availability;

The availability of the service path can be calculated according to the connection relationship between L ₁ 1-L ₁ 3 and their availability.

Therefore, it can be summarized as follows: the availability of the p-th level sub-paths is calculated according to the connection relationship between the p+1-th level sub-paths and the availability of the p+1-th level sub-paths (0≤p≤N-1).

The following describes how the availability of the p-th level sub-paths is calculated according to the connection relationship between the p+1-th level sub-paths and the availability of the p+1-th level sub-paths.

Since the connections are series and parallel, they are introduced separately.

1. The connection relationship is series

The availability A of the p-th subpath can be calculated by the following formula:

Where: A _i represents the availability of the i-th level p+1 sub-path, and n represents the number of p+1-th level sub-paths included in the p-th level sub-path.

For example, the service path shown in Figure 6a includes L ₁ 1-L ₁ 3 in series, assuming that the availability of L ₁ 1-L ₁ 3 is 0.8, 0.9 and 0.9 respectively, then the availability of the service path is: 0.8*0.9 *0.9=0.648.

Second, the connection relationship is parallel

The availability A of the p-th subpath can be calculated by the following formula:

A=1-U;

where U represents the unavailability of the p-th level subpath, u _i is the unavailability of the i-th sub-path of level p+1;

u _i =1-A _i , where A _i represents the availability of the i-th sub-path of level p+1.

Taking L ₁ 1 as an example, L ₁ 1 contains L ₂ 1-L ₂ 3, assuming that the availability of L ₂ 1-L ₂ 3 is 0.8, 0.9 and 0.9 respectively, and its unavailability is 0.2, 0.1 and 0.1 respectively, then The unavailability of L ₁ 1 is: 0.2*0.1*0.1=0.002, and its availability is 1−0.002=0.998.

The following describes how to calculate the availability of the transmission network element. The availability of the transmission network element is used to represent the probability that the transmission network element can work normally.

The transmission network element will fail, and the transmission network element is divided into two types: line failure and equipment failure. Among them, the line failure refers to the transmission interruption caused by the failure of the optical fiber line on the SDH ring, and there are four types of equipment failure scenarios, namely: (1) transmission interruption caused by an internal failure of a node device; (2) a certain Transmission interruption caused by equipment disk failure at the relay station; (3) transmission interruption caused by failure of SDH ring protection function; (4) other influencing factors, such as power failure, power environment failure, etc.

Of course, in the power communication transmission network, the point-to-point service channel is a recoverable object, as shown in Figure 8, it is always in the cycle of "work-fault-repair-work", and the time without failure accounts for the total running time of the system. The larger the ratio of , and the smaller the proportion of failure time, the higher the availability of the channel.

MTBF represents the mean time between failures of a certain transmission network element, and MTTR represents the mean time between failures of the transmission network element (normal time is included in the mean time between failures), then the availability ^AN of the transmission network element can be obtained by the following formula calculate:

A ^N =MTBF/(MTBF+MTTR).

MTBF and MTTR can be calculated as follows:

in, Indicates the failure rate, T indicates a given time period, d indicates the number of failures within T; T is a variable, which can be set arbitrarily; the superscript N indicates the transmission network element or the Nth level sub-path;

Among them, t _j represents the recovery time of the j-th fault, a _j represents the weight of the j-th fault; a _j is used to represent the impact of the j-th fault on the business, 1≤j≤d.

The weight is introduced because, in actual operation, faults that occur in different time periods have different impacts on the business, so the corresponding fault repair importance is also different. For example: Divide 24 hours a day into 3 time periods, you can define that the weight corresponding to the failure occurring between 8:00-20:00 is 2, and the corresponding weight corresponding to the failure occurring between 20:00-24:00 is 0.8 , the corresponding weight of the faults occurring between 0:00 and 8:00 is 0.2. The larger the value, the greater the impact on the business. Those skilled in the art can flexibly design weight values according to actual conditions, and details are not described here.

In order to ensure that the actual situation of the network can be reflected more correctly and reasonably, a longer time range (such as 1-2 years) can be selected, and the fault repair time and the number of faults in a certain time T can be counted, and the calculation can be obtained MTBF and MTTR.

The following describes how to perform operation and maintenance.

In an example, when the availability of the p-th sub-path is lower than a first threshold (for example, 90% or other), determine the p+1th level sub-path with the lowest availability among the p-th level sub-paths, the lowest availability Operation and maintenance of the p+1 level sub-path.

More specifically, the P+1th level subpath with the lowest availability can be deleted, or its internal transmission network elements can be updated.

Taking Figure 6a as an example, assuming that the availability of L ₁ 1 is lower than the first threshold but still higher than the second threshold, it can be determined which sub-path has the lowest availability among L ₂ 1-L ₂ 3 (assumed to be L ₂ 3) , then _L23 can be deleted, or the transmission network elements inside _L23 can be replaced.

In another example, when the availability of the p-th sub-path is lower than a second threshold (for example, 80%), the operation and maintenance means include any one or more of the following:

Delete the pth level subpath;

Allocating a new p-th level subpath for the target paired device; more specifically, allocating a new subpath whose availability is higher than the first threshold;

Reconfiguring the topology of the pth level sub-paths (below the second threshold), for example, if the internal topology of the pth level sub-paths is in series, it can be changed to parallel or series-parallel mixed to improve its availability.

Taking L ₂ 3 as an example, its interior is a series structure. If the availability of L ₂ 3 is lower than the second threshold, the topology of the SDH ring can be changed to parallel or series-parallel hybrid.

It can be seen that in this embodiment, the sub-paths with high risks can be located according to the availability, so as to perform more targeted operation and maintenance.

In addition, it should be noted that for point-to-point services, the high-reliability channel arrangement strategy model in the prior art is shown in Figure 9: two independent service channels are arranged for each production service such as protection and security control (in Figure 9 Channel 1 and 2), these two channels need to meet the "triple pair" conditions of "dual device", "dual routing" and "dual power supply". Among them, dual equipment means that the two channels should not share the transmission equipment, dual routing means that the two channels should be organized and opened along different communication lines, and do not overlap with each other, and dual power means that each set of transmission equipment should have two independent channels. communication power. In this way, when channel 1 fails, channel 2 can continue to carry services to ensure normal services.

The practice in the current network is to increase the availability of point-to-point service channels by adding redundant channels and enabling the SDH protection switching mechanism. This "dual device", "dual routing" and "dual power supply" method requires a lot of network Resources (including transmission equipment resources, channel optical cable resources, etc.) ensure availability, but also increase network costs, reduce the number of services that the network can carry, and reduce the network service carrying capacity.

However, by adopting the technical solution of the present application, multiple service paths can reuse high-availability sub-paths, thereby reducing network costs and increasing the number and capacity of network bearing services.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be directly implemented by hardware, software units executed by a processor, or a combination of both. The software unit can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A communication maintenance method, characterized in that, comprising: Determine the traffic path between target paired devices; calculating the availability of the service path; wherein, the availability of the service path is used to characterize the probability that the service path can work normally; the service path includes at least one level of sub-paths, and the availability of the service path is based on the service The availability of each sub-path in the path is calculated, and the availability of the sub-path is used to represent the probability that the sub-path can work normally; According to the availability of the service path, perform operation and maintenance on the service path between the target paired devices. 2. The method of claim 1, wherein The topology structure of the service path includes the first level sub-path to the Nth level sub-path, the service path is the 0th level sub-path, and the N-th level sub-path is a transmission network element; any p-th level sub-path contains at least A sub-path of level p+1, belonging to the same sub-path of level p, has a single connection relationship between sub-paths of level p+1; the connection relationship is series or parallel, 0≤p≤N-1 ; The availability of the p-th level sub-path is calculated according to the connection relationship and the availability of the p+1-th level sub-path. 3. The method according to claim 2, wherein when the connection relationship is in series, the availability A of the pth level sub-path is calculated by the following formula: Wherein: the A _i represents the availability of the i-th level p+1 sub-path, and the n represents the number of p+1-th level sub-paths included in the p-th level sub-path. 4. The method according to claim 2, wherein when the connection relationship is parallel, the availability A of the p-th sub-path is calculated by the following formula: A=1-U; Wherein, U represents the unavailability of the p-th level subpath, u _i is the unavailability of the i-th level p+1 sub-path, the n represents the number of p+1-th level sub-paths included in the p-th level sub-path, u _i =1-A _i , The A _i represents the availability of the i-th level p+1 sub-path. 5. The method according to claim 3 or 4, wherein the availability of the Nth-level subpath is the availability of a transmission network element, and the availability of the transmission network element is used to indicate that the transmission network element can work normally The probability. 6. The method according to claim 5, wherein the availability ^A of the transmission network element is calculated by the following formula: A ^N =MTBF/(MTBF+MTTR); the MTBF represents the mean time between failures, the MTTR represents the mean time to repair a failure, and the superscript N represents a transmission network element or an Nth-level subpath. 7. The method of claim 6, wherein, The MTBF=T/d, the T represents a given time period, and the d represents the number of failures within the T; said The _tj represents the recovery time of the jth fault, and the _aj represents the weight of the jth fault; the _aj is used to represent the impact of the jth fault on the service. 8. The method according to claim 2, wherein when the availability of the pth level sub-path is lower than a first threshold, the operation and maintenance comprises: determining the p+1th level subpath with the lowest usability among the pth level subpaths; Perform operation and maintenance on the p+1th level sub-path with the lowest availability. 9. The method according to claim 8, wherein when the availability of the p-th sub-path is lower than a second threshold, the operation and maintenance includes any one or more of the following: delete the p-th level subpath; assigning a new p-th level sub-path whose availability is higher than the first threshold to the target paired device; Reconfiguring the topology structure of the p-th level subpath. 10. A communication maintenance device, characterized in that it comprises: a determining unit, configured to determine a service path between target paired devices; An availability calculation unit, configured to calculate the availability of the service path; wherein, the availability of the service path is used to characterize the probability of normal operation of the service path; the service path includes at least one level of sub-paths, and the service path The availability is calculated according to the availability of each sub-path in the service path, and the availability of the sub-path is used to represent the probability that the sub-path works normally; The operation and maintenance unit is configured to perform operation and maintenance on the service path between the target paired devices according to the path availability of the service path.