CN113055221B - Typical bandwidth demand measuring and calculating method for power communication network transmission network based on region division - Google Patents
Typical bandwidth demand measuring and calculating method for power communication network transmission network based on region division Download PDFInfo
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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 requirement of a service channel; and step S3: measuring and calculating service bandwidth; and step S4: measuring and calculating the non-structural correlation; the invention considers the internal flow distribution condition of each level network, and can accurately predict the bandwidth requirement 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 power communication network planning, and particularly relates to a method for measuring and calculating typical bandwidth requirements of a power communication network transmission 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 mainly comprises 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 online monitoring, electric network operation environment monitoring, electric network operation management and other services; the enterprise management service mainly comprises various professional management information systems, administrative offices, information disaster tolerance 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;
and step S3: measuring and calculating service bandwidth;
and step S4: measuring and calculating non-structural correlation;
step S1, performing sub-region division on the whole planning network according to a coverage range, wherein the sub-region division is consistent with the power supply region division and is related to a final network topological structure, and the size of a sub-region is = q ÷ n; wherein q is the total number of counties and districts, n is the number of sub-regions to be divided, the number n of network sub-regions 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 the prefectured cities, or the size of the country-level sub-area is calculated according to the number of the prefectured provinces.
Further, step S2 performs non-structural correlation measurement and calculation, only considering traffic under the statistical aperture, and not considering bandwidth superposition and allocation of the associated network structural characteristics.
In addition, step S2 calculates the total bandwidth of the whole area through the single-station traffic volume, and the single-station bandwidth B is calculated by using the following formula:
a i the number of the ith type of service;
b i the bandwidth is the bandwidth of the ith service and the unit is b/s;
n is the number of service classes;
i is a positive integer.
Additionally, step S2 calculates total bandwidth B of the region according to the number of single stations at each level in the region General (1) ；
And m is the number of single stations in the sub-area.
B General (1) A total bandwidth for the sub-region;
B i is 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 present General (1) < 20Gb/s, the range of the sub-region should be expanded, e.g., B General (1) If the rate is more than 40Gb/s, the range of the sub-regions should be reduced, and the number of the sub-regions and the size of each sub-region are coordinated by expanding or reducing the range of the sub-regions.
Preferably, in step S4, the bandwidth of the service carried by the transmission network is measured and calculated based on the characteristics of the circuit switching system, the service carried by the service network considers the concurrency ratio, 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 measurement 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 optical cable 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 broken line diagram of an equivalent subnet for implementing 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 of the equivalent network bandwidth allocation according to the present invention.
Table 1 is a power grid communication station bandwidth prediction table in the present invention.
Table 2 is a table for predicting section bandwidth of each transmission network in the present invention.
Table 3 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 requirement of a service channel;
and step S3: measuring and calculating service bandwidth;
and step S4: and (5) measuring and calculating the non-structural correlation.
Step S1, performing sub-region division on the whole planning network according to a coverage range, wherein the sub-region division is consistent with the power supply region division as much as possible in order to better fit with services, the sub-region division is also related to a final network topological structure, and the region size (the number of the administered counties) = q ÷ n; wherein q is the total number of counties and counties of the region, n is the number of sub-regions to be divided, and the number n of the network sub-regions 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 S2, performing non-structural correlation measurement and calculation (single-station and total section bandwidth measurement and calculation), only considering the traffic under the statistical caliber, and not considering the bandwidth superposition and distribution of the associated network structural 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:
a i the number of the ith type of service;
b i the 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 level in the region General 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.
And S3, in order to control the network scale, the bandwidth of each sub-area needs to be controlled within a certain interval range, the range can be determined according to 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 present General assembly If < 20Gb/s, the sub-region should be enlargedExtent of domains, e.g. B General assembly If 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. By optimizing the size of the sub-area, the network scale can be well controlled, the precision degree of measurement and calculation is improved, and preparation is made for subsequent network structure related measurement and calculation.
And S4, measuring and calculating the service channel requirements, and determining the channel requirements of various services at different sites, including interface bandwidth, channel quantity, 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 actually distributes the bandwidth for the transmission system.
The prediction of various services mainly determines the accumulated caliber and the predicted bandwidth B Industry = Σ (single channel bandwidth × number of channels × reliability coefficient).
The number of channels is the number of channels that the traffic needs to have actual physical ports. 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, generally, if a scheduling data network recommends that the convergent points are calculated according to the proportion of a direct-regulation station 1. The special line service is directly calculated according to a formula.
The reliability requirement indicates whether the service needs the transport network for path 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.
And secondly, performing structure correlation measurement and calculation (subnet/ring network bandwidth measurement and calculation) of bandwidth superposition, relying on an optical cable net rack, simplifying a network structure, measuring and calculating service bandwidth in each subnet/ring network region after constructing an equivalent network according to division of different subnets/ring networks, and providing bandwidth requirements of sub-regions on the core layer.
Subnet bandwidth = B Industry 1 +B Industry 2 +B Industry 3 +……+B N of industry
The bandwidth P of the sub-region to the core layer = 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 sub-area 2 subnet to core layer link bandwidth = (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 economy 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 bandwidths, channel numbers, reliability coefficients and the like, and various service predictions mainly determine the cumulative aperture, and the predicted bandwidth = Σ (single channel bandwidth × channel number × reliability coefficient).
The channel number is the number of channels with actual physical ports required by the service, and the reliability requirement indicates whether the service needs a transmission network for channel protection.
The bandwidth of the sub-region to the core layer = subnet bandwidth/n, where n is the number of sub-region equivalent network to core layer links.
Only by the embodiment, a certain transformer substation deploys 1 set of dispatching data network provincial dispatching access network equipment and 1 set of dispatching data network local dispatching access network equipment, 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, the single channel bandwidth of the dispatching data network service of the transformer substation is 2M, the number of the 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 table 1.
The prediction of the demand of the single type of service considers all the demands of a specific type of service, and the specific type of service generally refers to a transmission network user, and can be a specific service type (such as scheduling automation service) or a service network (such as scheduling data network) formed by networking through 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 bandwidth of the transmission network section at each level is predicted, and the result is shown in table 2.
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 in 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 subnets, but power grids among the subnets are relatively independent, and the number of the contact optical cables and the traffic in the subnet areas are not suitable to be too large. In addition, the subnet/looped 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 amount in a specific area, wherein the specific area can be one or more power supply areas and 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, so that convergence service and network passing service are concerned, the construction of regional trunk lines is supported, and the bandwidth demand is provided for the construction of a transmission network core layer.
Taking a transmission network of a certain city as an example, the method performs subnet division and network equivalence on the transmission network, and the result is shown in table 3 through subnet/ring network bandwidth prediction, wherein fig. 2 is a schematic diagram of an optical cable of 110kV and above in the certain city, and 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 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 as an embodiment, 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 central subnet needs to consider the cross-network bandwidth requirement of the south subnet 25.45G in addition to the core layer 38.18G channel requirement of the central subnet. 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 economy and the effective load bearing of the future service, the extension scheme of the OTN plane to the city is preferably selected. 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 present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A typical bandwidth demand measuring and calculating method for a power communication network transmission network is characterized by comprising the following steps:
step S1: dividing a network area, namely dividing the whole planning network into subareas according to a coverage range, wherein the subareas are consistent with the power supply area and are related to a final network topology structure, and the subareas can comprise a plurality of counties, cities and provinces;
step S2: calculating the service channel requirement and the non-structural correlation, only considering the service volume under the statistical caliber, not considering the bandwidth superposition and distribution of the associated network structure characteristics, and calculating the total bandwidth in the sub-area according to the number of each level of single stations in the area;
and step S3: measuring and calculating service bandwidth, predicting S1 divided region bandwidth, constructing a sub-network by expanding or reducing the number of coordinated sub-regions in the range of the sub-regions and the size of each sub-region, and constructing an equivalent network by equivalent sub-network nodes, simplifying an optical cable network architecture, wherein the equivalent network comprises the composition of the number of links from each sub-region and the boundary of the sub-region to a core layer or other sub-regions;
and step S4: measuring and calculating the non-structural correlation, wherein the transmission network bearing service bandwidth is measured and calculated based on the characteristics of a circuit switching system, the single-channel bandwidth is used for actually distributing the bandwidth for the transmission system, the service channel requirement measurement and calculation are carried out, and the channel requirements of various services at different sites are determined;
step S5: and measuring and calculating the structure correlation, namely measuring and calculating the service bandwidth in each subnet/ring network region based on an equivalent network, proposing the bandwidth requirement of the sub-regions on a core layer, further considering a technical system, a grid structure, system deployment and a service channel mode strategy on the basis of predicting the subnet/ring network bandwidth, distributing the sub-plane and multi-system bandwidth, determining a network architecture and guiding the type selection of communication station equipment.
2. The method for calculating the typical bandwidth requirement of the power communication network transmission network according to claim 1, wherein power supply subareas, county area division, optical cable conditions and power grid size factors are combined, in the step S1, power supply area division is referred to, and interconnection optical cables among power grids in different power supply areas are used as main optical cables constructed by a core layer; secondly, the power supply partitions with excessive nodes and large areas can further divide sub-networks, 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; setting the subnet bandwidth boundary between 20Gb/s and 40Gb/s, if B total is less than 20Gb/s, expanding the range of the subarea, and if B total is more than 40Gb/s, reducing the range of the subarea; s2, S3, respectively calculating the inner bandwidth and the outer bandwidth of the sub-area, and adjusting according to the boundary of the sub-area.
3. A method for estimating the typical bandwidth requirement of a transmission network of an electric power communication network according to claim 1 or 2, characterized in that:
the method is realized through a power communication network bandwidth demand prediction system, and the power communication 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/looped network bandwidth prediction unit and a system bandwidth prediction unit.
4. A method for estimating typical bandwidth requirements of a transmission network of an electric power communication network according to claim 3, characterized in that:
the power communication network transmission network bandwidth demand prediction system is characterized in that different system network architectures are preset firstly, and plane, sub-plane and system bandwidth allocation is carried out according to subnet bandwidth prediction data; and secondly, comparing the quality of the service capability of the system network for bearing all levels of sites according to the bandwidth allocation condition, and finally, making the system network architecture clear and optimized.
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