CN113055221A - Typical bandwidth demand measuring and calculating method for power communication network transmission network - Google Patents
Typical bandwidth demand measuring and calculating method for power communication network transmission network Download PDFInfo
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- CN113055221A CN113055221A CN202011481043.8A CN202011481043A CN113055221A CN 113055221 A CN113055221 A CN 113055221A CN 202011481043 A CN202011481043 A CN 202011481043A CN 113055221 A CN113055221 A CN 113055221A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H04L41/147—Network analysis or design for predicting network behaviour
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- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
Abstract
The invention provides a typical bandwidth demand measuring and calculating method for a power communication network transmission network, which comprises the following steps: step S1: dividing a network area; step S2: measuring and calculating the service channel requirement; step S3: measuring and calculating service bandwidth; step S4: measuring and calculating the non-structural correlation; the invention considers the distribution condition of the internal flow of each level network, and can accurately predict the bandwidth requirements of a single site and a sub-network; meanwhile, the method for predicting and calculating the transmission network bandwidth of the power communication network can guide the scheme planning of the transmission network architecture and the system structure, optimize the equipment configuration of the station, and improve the network economy and the planning investment accuracy.
Description
Technical Field
The invention belongs to the technical field of planning of power communication networks, and particularly relates to a typical bandwidth demand measuring and calculating method for a transmission network of a power communication network.
Background
In the process of making a planning scheme of a transmission network of the power communication network, traffic bandwidths such as transmission network nodes, services, network sections and the like need to be predicted, and network architecture and node equipment type selection are supported based on prediction data. The electric power communication transmission network service is mainly divided into two types of electric network production service and enterprise management service, wherein the electric network production service comprises electric network operation control, electric network equipment on-line monitoring, electric network operation environment monitoring, electric network operation management and other services; the enterprise management business mainly comprises various professional management information systems, administrative offices, information disaster recovery and the like.
The direct users of the power communication transmission network comprise a service network, a service system and a service; the service network mainly comprises a scheduling data network, a data communication network, a power distribution data network, a network management network and the like, the transmission network provides a networking channel for the service network, and the scheduling data network and the data communication network are used as two service networks to bear a large amount of power grid production services and enterprise management services.
The conventional bandwidth demand measuring and calculating method is mainly based on the analysis of the whole network architecture, emphasizes on the analysis of the bandwidth flow of a network section, does not consider the distribution condition of the internal flow of each level of network, is difficult to accurately predict the bandwidth demand of a single site and a sub-network, and cannot accurately plan and predict the bandwidth bottleneck.
Disclosure of Invention
Based on the problems of the prior art, the invention provides a typical bandwidth demand measuring and calculating method for a transmission network of a power communication network, which considers the internal traffic distribution condition of each level network and can accurately predict the bandwidth demand of a single station and a sub-network; meanwhile, the method for predicting and calculating the transmission network bandwidth of the power communication network can guide the scheme planning of the transmission network architecture and the system structure, optimize the equipment configuration of the station, and improve the network economy and the planning investment accuracy.
Based on the technical scheme of the invention, the typical bandwidth demand measuring and calculating method for the transmission network of the power communication network comprises the following steps:
step S1: dividing a network area;
step S2: measuring and calculating the service channel requirement;
step S3: measuring and calculating service bandwidth;
step S4: and (5) measuring and calculating the non-structural correlation.
Step S1 is to divide the entire planned network into sub-regions according to the coverage area, where the sub-region division is consistent with the power supply region division and related to the final network topology, and the size of the sub-region is q ÷ n; wherein q is the total number of the counties and the districts, n is the number of the subregions to be divided, the number n of the network subregions is more than or equal to 2, and q and n are positive integers.
Preferably, the sub-regions can be subdivided in a similar manner for different classes of sub-regions.
More preferably, the size of the sub-area of the provincial network is calculated according to the number of municipalities under jurisdiction, or the size of the country-level sub-area is calculated according to the number of provinces under jurisdiction.
Further, step S2 performs the non-structural correlation measurement, considering only the traffic under the statistical aperture, and not considering the bandwidth superposition and allocation associated with the network structural characteristics.
In addition, in step S2, the total bandwidth of the entire area is calculated through the single-station traffic volume, and the single-station bandwidth B is calculated by using the following formula:
aithe number of the ith type of service;
bithe bandwidth is the bandwidth of the ith type of service and the unit b/s;
n is the number of service classes;
i is a positive integer.
Additionally, step S2 calculates total bandwidth B of the area according to the number of single stations at each level in the areaGeneral assembly；
And m is the number of single stations in the sub-area.
BGeneral assemblyThe total bandwidth of the sub-region;
Biis the bandwidth of the ith station.
i is a positive integer.
In step S3, the bandwidth of each sub-area needs to be controlled within a certain range. Further, the range is determined according to measurement and calculation requirements, and the region-level large-capacity network interval is set between 20Gb/s and 40 Gb/s.
If B is presentGeneral assembly< 20Gb/s, the range of the sub-region should be expanded, e.g., BGeneral assemblyIf the sub-area range is larger than 40Gb/s, the sub-area range is reduced, and the number of the sub-areas and the area size of each sub-area are coordinated by expanding or reducing the sub-area range.
Preferably, in step S4, the bandwidth of the transmission network bearer service is measured and calculated based on the characteristics of the circuit switching system, the concurrency ratio is considered for the service network bearer service, and the single-channel bandwidth actually allocates the bandwidth to the transmission system.
Compared with the prior art, the method for measuring and calculating the typical bandwidth requirement of the transmission network of the power communication network has the following technical effects:
first, the method considers the distribution situation of the internal traffic of each level of network, and can accurately predict the bandwidth requirements of a single site and a sub-network.
Secondly, the method for predicting and calculating the transmission network bandwidth of the power communication network can guide the scheme planning of the transmission network architecture and the system structure, optimize the equipment configuration of the station, improve the network economy and the planning investment accuracy, and avoid the generation of network bottlenecks by using an equivalent method.
Drawings
FIG. 1 is a schematic flow chart of a typical bandwidth demand estimation method for a transmission network of an electric power communication network according to the present invention;
FIG. 2 is a schematic view of 110kV and above cables in a certain city;
FIG. 3-1 is a schematic diagram of an equivalent subnet block implementing the method of the present invention;
FIG. 3-2 is a schematic view of a broken line of an equivalent subnet for carrying out the method of the present invention;
FIG. 4-1 is a schematic diagram of an equivalent network bandwidth allocation block according to the present invention;
FIG. 4-2 is a broken line diagram illustrating an equivalent network bandwidth allocation according to the present invention;
FIG. 5 is a table for predicting the bandwidth of a grid communication site according to the present invention;
FIG. 6 is a table for predicting section bandwidth of transmission networks at different levels according to the present invention;
fig. 7 is a subnet/ring network bandwidth prediction table in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The invention discloses a method for measuring and calculating the bandwidth requirement of a transmission network of a power communication network, which specifically comprises the following steps:
step S1: dividing a network area;
step S2: measuring and calculating the service channel requirement;
step S3: measuring and calculating service bandwidth;
step S4: and (5) measuring and calculating the non-structural correlation.
Step S1, performing sub-region division on the entire planned network according to the coverage area, wherein the sub-region division is as consistent as possible with the power supply region division for better matching with the service, the sub-region division is also related to the final network topology structure, and the region size of the sub-region (the number of the administered counties) is q ÷ n; wherein q is the total number of the counties and the districts, n is the number of the subregions to be divided, and the number n of the network subregions is more than or equal to 2. And for the sub-regions with different grades, the sub-regions can be divided again according to a similar method, for example, the size of the sub-region of the provincial network can be calculated according to the number of the prefectures in the city, the size of the country-level sub-region can be calculated according to the number of the prefectures in the city, and q and n are both positive integers.
And step S2, performing non-structural correlation measurement (single-station and total section bandwidth measurement), only considering the traffic under the statistical aperture, and not considering the bandwidth superposition and distribution of the associated network structure characteristics. The total bandwidth of the whole area is calculated through the single-station traffic volume.
The single station bandwidth (B) is measured and calculated by adopting the following formula:
aithe number of the ith type of service;
bithe bandwidth is the bandwidth of the ith type of service and the unit b/s;
n is the number of service classes;
preferably, the total bandwidth B of the region is calculated according to the number of single stations at each stage in the regionGeneral assembly。
And m is the number of single stations in the sub-area.
Furthermore, the structure correlation measurement and calculation (subnet/ring network bandwidth measurement and calculation) of bandwidth superposition is carried out, the network structure is simplified by relying on the optical cable net rack, different subnets/ring networks are divided, the service bandwidth in each subnet/ring network region is measured and calculated after an equivalent network is constructed, and the bandwidth requirement of the region on the core layer is provided. And performing structural correlation measurement and calculation (system bandwidth measurement and calculation) of bandwidth allocation, presetting a transmission network overall architecture, a technical system, system deployment quantity and a service mode strategy, performing demand measurement and calculation according to the preset network architecture, performing technical-economic comparison and construction operation and maintenance mode matching, and determining the transmission network architecture and system composition.
Step S3, in order to control the network scale, the bandwidth of each sub-area needs to be controlled in a certain range, the range can be determined according to the measurement and calculation requirements, and the general area-level large-capacity network interval can be set between 20Gb/S and 40 Gb/S. If B is presentGeneral assembly< 20Gb/s, the range of the sub-region should be expanded, e.g., BGeneral assemblyIf the sub-area range is larger than 40Gb/s, the sub-area range is reduced, and the number of the sub-areas and the area size of each sub-area are coordinated by expanding or reducing the sub-area range. The network scale can be well controlled by optimizing the sizes of the sub-regions, the measuring and calculating fineness is improved, and preparation is made for the subsequent network structure related measuring and calculating.
And step S4, performing service channel requirement measurement and calculation, and determining the channel requirements of various services at different sites, including interface bandwidth, channel number, reliability coefficient and the like. The bandwidth of the transmission network bearing service is measured and calculated based on the characteristics of a circuit switching system, the service network bearing service considers the concurrency proportion, and the single-channel bandwidth is used for actually distributing the bandwidth for the transmission system.
The prediction of various services mainly determines the accumulated caliber and the predicted bandwidth BIndustryΣ (single channel bandwidth × number of channels × reliability coefficient).
The number of channels is the number of channels that the actual physical port exists for the traffic needs. The quantity of the networking service channels is determined according to the quantity of the convergent points, redundancy is generally considered in planning, and each convergent point is in double-channel uplink. The number of the convergent points is calculated according to the number of the stations in the sub-area multiplied by a certain proportion, for example, the convergent points are calculated according to the proportion of 1:10 of the direct-regulation stations recommended by a dispatching data network, the convergent points are calculated according to the proportion of 1:8 of the direct-regulation stations by a data communication network, and each convergent point is connected with a double channel. The special line service is directly calculated according to a formula.
The reliability requirement indicates whether the service needs the transport network for channel protection. The electric power system proposes to take two values of 1 or 2, wherein the value 1 represents that the doubling protection requirement is not carried out, and the value 2 represents that the doubling or redundancy protection is carried out.
Secondly, performing structure correlation measurement and calculation (subnet/ring network bandwidth measurement and calculation) of bandwidth superposition, relying on an optical cable net rack to simplify a network structure, measuring and calculating service bandwidth in each subnet/ring network region after an equivalent network is constructed according to division of different subnets/ring networks, and providing bandwidth requirements of sub-regions on a core layer.
Sub-network bandwidth BIndustry 1+BIndustry 2+BIndustry 3+……+BTrade n
And the bandwidth P of the sub-region to the core layer is equal to the subnet bandwidth/n, and n is the number of links from the sub-region equivalent network to the core layer. The number of links from the sub-region equivalent network to the core layer is the sum of the number of links from the sub-region boundary nodes to the core layer. The composition of the equivalent network includes the number of links from each sub-region, the boundary of the sub-region to the core layer or other sub-regions. The predicted bandwidth of the sub-region network and the sub-region uplink bandwidth can be obtained through calculation, and if the bandwidth of the sub-region to the core layer is larger than the current network bandwidth, the network needs to be modified or upgraded. During measurement, the past bandwidth is calculated according to the serial connection relationship among the sub-areas of the network architecture, and if the sub-area 1 subnet passes through the sub-area 2 subnet to the core layer, the link bandwidth from the sub-area 2 subnet to the core layer is (subnet 1 bandwidth + subnet 2 bandwidth) ÷ link number. From this the bandwidth demand of the network backbone is measured.
The method for measuring and calculating the bandwidth requirement of the transmission network of the power communication network further comprises the step S5 of measuring and calculating the structural correlation of bandwidth allocation (measuring and calculating system bandwidth), presetting the overall architecture, the technical system, the system deployment quantity and the service mode strategy of the transmission network, then measuring and calculating the requirement according to the preset network architecture, carrying out technical-economic comparison and construction operation and maintenance mode matching, and determining the network architecture and the system constitution of the transmission network.
The power communication network transmission network bandwidth demand prediction system comprises a single-station bandwidth prediction unit, a single-class service demand prediction unit, a section bandwidth prediction unit, a subnet/ring network bandwidth prediction unit and a system bandwidth prediction unit.
Further, in the method for measuring and calculating the bandwidth requirement of the transmission network of the power communication network, the service channel requirement measurement and calculation determines the channel requirements of various services at different sites, including interface bandwidth, channel number, reliability coefficient and the like, and various service predictions mainly determine an accumulated caliber, and the predicted bandwidth is Σ (single channel bandwidth × channel number × reliability coefficient).
The channel number is the number of channels with actual physical ports needed by the service, and the reliability requirement indicates whether the service needs to perform channel protection on a transmission network.
The bandwidth of the sub-region to the core layer is equal to the subnet bandwidth/n, and n is the number of links from the sub-region equivalent network to the core layer.
Only as an embodiment, a certain transformer substation deploys 1 set of provincial dispatching access network equipment and local dispatching access network equipment of a dispatching data network, each set of equipment has a unidirectional 4M bandwidth, adopts 2M interfaces and is dually returned to two different sink nodes, each 2M channel adopts a subnet connection protection mode, so that the single channel bandwidth of the dispatching data network service of the transformer substation is 2M, the number of channels is 8 (4 for each provincial dispatching access network and local dispatching access network), the reliability coefficient is 2, and the bandwidth requirement of the dispatching data network service channel is 2 × 8 × 2 ═ 32M.
The single-station bandwidth prediction only considers the service requirements of the station, is suitable for various communication stations, is mainly used for measuring and calculating stations (such as transformer substations) with regular services and more services, selects the channel number and the reliability setting in a common mode strategy, and can measure and calculate the bandwidth requirements of different stations.
Only as an embodiment, the channel number and reliability setting in the common mode strategy are selected, and the bandwidth of the common power grid communication station is predicted, and the result is shown in fig. 5.
The prediction of the demand of the single-type service considers all demands of a specific certain type of service, and the certain type of service generally refers to a transmission network user, and can be a specific service type (such as dispatching automation service) or a service network (such as dispatching data network) networked by a transmission network channel.
The section bandwidth prediction mainly considers the service of a transmission network center node, does not consider factors such as a network structure, a bearing mode and the like, and is used for measuring and calculating important service centers with large service volume, such as a company headquarters, a scheduling mechanism, a data center and the like.
Only as an embodiment, a common network structure is selected, and the section bandwidth of each level of transmission network is predicted, and the result is shown in fig. 6.
The method comprises the steps of predicting the bandwidth of the subnet/looped network, constructing the subnet by combining factors such as power supply subareas, county division, optical cable conditions, power grid quantity and the like, simplifying an optical cable network architecture by equivalence of nodes of the subnet, and determining a basic optical cable subnet constructed by a transmission network core layer. Firstly, referring to power supply area division of a power grid, and taking an optical cable of a tie line between power grids of different power supply areas as a main optical cable constructed by a core layer. And secondly, the power supply partitions with excessive nodes and large areas can further divide the sub-networks, but the power grids among the sub-networks are relatively independent, and the number of the communication optical cables and the service volume in the sub-network areas are not suitable to be too large. In addition, the subnet/ring network bandwidth prediction is based on a physical optical cable net rack, neglects the sharing of services of multiple systems and multiple logical channels of a transmission network, and is mainly used for measuring and calculating the total service demand in a specific area, wherein the specific area can be one or more power supply areas, local cities/counties, and on the basis of single-station bandwidth, the convergence mode and the data flow direction of an associated network structure are considered, the convergence service and the network passing service are concerned, the construction of regional trunk lines is supported, and the bandwidth demand is provided for the construction of a core layer of the transmission network.
Only as an embodiment, taking a transmission network in a certain city as an example, performing subnet division and network equivalence on the transmission network, and predicting the bandwidth through a subnet/ring network, wherein the result is shown in fig. 7, fig. 2 is a schematic diagram of an optical cable of 110kV and above in a certain city, and fig. 3-1 is a schematic diagram of an equivalent subnet block for implementing the method of the present invention; fig. 3-2 is a schematic view of an equivalent subnet broken line for implementing the method of the present invention.
The system bandwidth prediction comprises the steps of firstly presetting different system network architectures, carrying out plane, sub-plane and system bandwidth allocation according to subnet bandwidth prediction data, secondly comparing the quality of service capacity of each level of site borne by a system network according to bandwidth allocation conditions, and finally determining and optimizing the system network architecture. The system bandwidth prediction is based on the subnet/looped network bandwidth prediction, further considers technical system, grid structure, system deployment and service channel mode strategies, carries out sub-plane and multi-system bandwidth allocation, determines network architecture and guides the type selection of communication station equipment
Only by way of example, taking the above-mentioned transmission network in a certain city as an example, the system bandwidth prediction and bandwidth allocation are performed on the result of the sub-network division and the network equivalence. According to the prediction data, the middle sub-network needs to consider the over-network bandwidth requirement of the south sub-network 25.45G in addition to the core layer 38.18G channel requirement of the middle sub-network. If the system-through network adopts the SDH plane to construct province, prefecture and prefecture integrated biplane, 10G bandwidth and 4 optical cable routes, the core layer 80G bandwidth construction can be realized, and the sub-network service bearing requirement can be met. However, the superposition effect of the middle subnet is obvious, the bandwidth utilization rate reaches 80% (the middle subnet and the south subnet are 63.63G/80G), the 10G trunk optical path of the core section can only ensure N-1, and the capacity of future service growth reservation and detour guarantee is insufficient. If the SDH optical path mode is added through the same optical cable route to improve the service bearing capacity, the rerouting rate of the transmission network is improved, the reliability is not obviously improved, the consumption of an optical fiber core is increased, the expansibility is poor, and the mode arrangement is complex. Therefore, considering the economic efficiency and the effective bearing of the future service, the extension scheme of the OTN plane to the city is preferred. FIG. 4-1 is a schematic diagram of an equivalent network bandwidth allocation block according to the present invention; fig. 4-2 is a broken line diagram of the equivalent network bandwidth allocation according to the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. A method for measuring and calculating the bandwidth requirement of a transmission network of a power communication network is characterized by comprising the following steps: which comprises the following steps:
step S1: dividing a network area;
step S2: measuring and calculating the service channel requirement;
step S3: measuring and calculating service bandwidth;
step S4: and (5) measuring and calculating the non-structural correlation.
2. The method for estimating bandwidth requirement of transmission network of power communication network according to claim 1, wherein: step S1, sub-region division is carried out on the whole planning network according to the coverage area, the sub-region division is consistent with the power supply region division and is related to the final network topological structure, and the size of the sub-region is q/n; wherein q is the total number of the counties and the districts, n is the number of the subregions to be divided, the number n of the network subregions is more than or equal to 2, and q and n are positive integers.
3. The method for estimating bandwidth requirement of transmission network of power communication network as claimed in claim 2, wherein: the sub-regions may be subdivided in a similar manner for different levels of sub-regions.
4. The method for estimating bandwidth requirement of transmission network of power communication network according to claim 3, wherein: the size of the sub-region of the provincial network is calculated according to the number of the prefectured cities, and the size of the national sub-region is calculated according to the number of the prefectured provinces.
5. The method for estimating bandwidth requirement of transmission network of power communication network according to claim 1, wherein: step S2 performs non-structural correlation measurement, considering only traffic under statistical aperture, and not considering bandwidth superposition and allocation associated with network structural characteristics.
6. The method for estimating bandwidth requirement of transmission network of power communication network according to claim 1, wherein: step S2, the total bandwidth of the whole area is calculated through the single station traffic volume, and the single station bandwidth B is calculated by adopting the following formula:
aithe number of the ith type of service;
bifor bandwidth of class i trafficBit b/s;
n is the number of service classes;
i is a positive integer.
7. The method for estimating bandwidth requirement of power communication network transmission network according to claim 1, wherein step S2 is to calculate total bandwidth B of the area according to the number of single stations in each level of the areaGeneral assembly；
m is the number of single stations in the sub-area;
Bgeneral assemblyThe total bandwidth of the sub-region;
Biis the bandwidth of the ith station;
i is a positive integer.
8. The method for estimating bandwidth requirement of power communication network transmission network according to claim 1, wherein in step S3, the bandwidth requirement of each sub-area is controlled within a certain interval.
9. The method for estimating bandwidth requirement of transmission network of electric power communication network as claimed in claim 8, wherein said range is determined according to the estimation requirement, and the region-level large capacity network interval is set between 20Gb/s and 40 Gb/s.
10. Method for estimating the bandwidth requirement of a transmission network of an electric power communication network according to claim 8, characterized in that if B is greater than BGeneral assembly< 20Gb/s, the range of the sub-region should be expanded, e.g., BGeneral assemblyIf the sub-area range is larger than 40Gb/s, the sub-area range is reduced, and the number of the sub-areas and the area size of each sub-area are coordinated by expanding or reducing the sub-area range.
11. The method for estimating bandwidth requirement of transmission network of power communication network as claimed in claim 1, wherein in step S4, the bandwidth of the transmission network carrying service is estimated based on the characteristics of the circuit switching system, the concurrent proportion of the service carrying service is considered, and the bandwidth of single channel is actually allocated to the transmission system.
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