CN109246494B - PTN-OTN hybrid networking method and optical transport network architecture - Google Patents
PTN-OTN hybrid networking method and optical transport network architecture Download PDFInfo
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Abstract
The invention relates to a PTN-OTN hybrid networking method and an optical transport network architecture. The method comprises the following steps: deploying OTN equipment nodes at a core layer of an optical transport network, wherein the OTN equipment nodes deployed at the core layer gradually sink towards a convergence layer of the optical transport network along with the increase of bandwidth demand; selecting part of nodes in the convergence layer as core nodes, and deploying OTN equipment nodes and PTN equipment nodes at the same time in the selected core nodes; and deploying PTN equipment nodes at an access layer of the optical transmission network, and accessing the communication equipment accessed to the access layer to the core layer after the communication equipment is converged by the convergence layer. By adopting the scheme of the invention, the bandwidth capability of the convergence layer and the service bearing efficiency can be improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a PTN-OTN hybrid networking method and an optical transport network architecture.
Background
With the increasing progress of IP (internet protocol) networking of communication networks, a new generation of Optical transmission technology represented by OTN (Optical Transport Network) and PTN (Packet Transport Network) is replacing the roles of DWDM (Dense Wavelength Multiplexing) and MSTP (Multi-Service Transport Platform based on SDH) and is becoming a major product of Optical transmission.
Based on traditional transmission technologies such as SDH (Synchronous Digital Hierarchy), a traditional networking mode mainly adopts a TDM time division multiplexing cross mode, and for IP-like large-bandwidth services such as FE (Fast Ethernet), GE (Gigabit Ethernet) and larger particles, problems of insufficient bandwidth of a convergence layer and low service carrying efficiency may occur.
Disclosure of Invention
Therefore, it is necessary to provide a PTN-OTN hybrid networking method and an optical transport network architecture, which can improve the bandwidth capability of the convergence layer and the service carrying efficiency.
A PTN-OTN hybrid networking method, the method comprising:
deploying OTN equipment nodes at a core layer of an optical transport network, wherein the OTN equipment nodes deployed at the core layer gradually sink towards a convergence layer of the optical transport network along with the increase of bandwidth demand;
selecting part of nodes in the convergence layer as core nodes, and deploying OTN equipment nodes and PTN equipment nodes at the same time in the selected core nodes;
and deploying PTN equipment nodes at an access layer of the optical transmission network, and accessing the communication equipment accessed to the access layer to the core layer after the communication equipment is converged by the convergence layer.
In one embodiment, the PTN-OTN hybrid networking method further includes:
performing first-level area division on the optical transport network architecture to obtain core areas of all the integrated services;
respectively carrying out second-level area division on each integrated service core area to obtain each integrated service convergence area corresponding to each service core area;
and respectively carrying out third-level area division on each integrated service convergence area corresponding to each service core area to obtain each integrated service access area corresponding to each integrated service convergence area.
In one embodiment, the performing second-level region division on each of the integrated service core regions respectively to obtain each integrated service convergence region corresponding to each of the service core regions includes:
acquiring administrative region information, natural area information, road network structure information and customer distribution information;
and dividing a target integrated service convergence area into a plurality of integrated service convergence areas by combining the administrative region information, the natural area information, the road network structure information and the client distribution information.
In one embodiment, the PTN-OTN hybrid networking method further includes:
acquiring a current bandwidth demand and an upper bandwidth demand of the optical transport network, where the upper bandwidth demand is the bandwidth demand of the optical transport network before an OTN device node deployed by the core layer sinks to a metropolitan area convergence layer of the optical transport network last time;
acquiring an increase amplitude value of the bandwidth demand of the optical transmission network according to the current bandwidth demand and the previous bandwidth demand;
and when the amplitude increasing value meets a preset adjusting condition, sinking the OTN equipment node deployed by the core layer to the convergence layer.
In one embodiment, the PTN-OTN hybrid networking method further includes:
and deploying PTN equipment nodes at the rest nodes in the convergence layer, wherein the rest nodes are the equipment nodes except the core node in the convergence layer.
An optical transport network architecture comprises a core layer, a convergence layer and an access layer, wherein the core layer is deployed with OTN equipment nodes, and the OTN equipment nodes deployed by the core layer gradually sink to the convergence layer of the optical transport network along with the increase of bandwidth demand; a part of nodes in the convergence layer are used as core nodes, the core nodes are simultaneously deployed with OTN equipment nodes and PTN equipment nodes, and the rest nodes are deployed with the OTN equipment nodes and the PTN equipment nodes; and the access layer deploys PTN equipment nodes, and communication equipment accessed to the access layer is accessed to the core layer after being converged by the convergence layer.
In one embodiment, the optical transport network architecture performs area division by using the following method: carrying out first-level area division on an optical transmission network architecture to obtain core areas of all the integrated services; respectively carrying out second-level area division on each integrated service core area to obtain each integrated service convergence area corresponding to each service core area; and respectively carrying out third-level area division on each integrated service convergence area corresponding to each service core area to obtain each integrated service access area corresponding to each integrated service convergence area.
In one embodiment, the second-level region dividing manner includes: acquiring administrative region information, natural area information, road network structure information and customer distribution information; and dividing a target integrated service convergence area into a plurality of integrated service convergence areas by combining the administrative region information, the natural area information, the road network structure information and the client distribution information.
In one embodiment, 1 to 2 service convergence nodes are respectively disposed in each integrated service access area, and 1 to 2 service convergence nodes are respectively disposed in each integrated service convergence area.
In one embodiment, each of the integrated service access areas includes 1 to 2 service aggregation points, 1 to 4 trunk access cable rings, and more than one optical fiber point.
The above-mentioned PTN-OTN hybrid networking method and optical transport network architecture are configured by deploying OTN device nodes at a core layer of an optical transport network, the OTN device nodes deployed at the core layer gradually sinking to a convergence layer of the optical transport network with an increase in bandwidth demand, selecting a part of nodes in the convergence layer as core nodes, deploying the OTN device nodes and the PTN device nodes at the same time at the selected core nodes, deploying the PTN device nodes at an access layer of the optical transport network, and accessing a communication device accessed to the access layer to the core layer after converging through the convergence layer. On one hand, OTN equipment nodes deployed in a core layer gradually sink to a convergence layer of the optical transmission network along with the increase of bandwidth demand, so that the requirement of continuously increasing traffic on the bandwidth of the convergence layer can be met, on the other hand, part of nodes in the convergence layer are selected as core nodes, and the OTN equipment nodes and PTN equipment nodes are deployed at the same time on the selected core nodes, so that network fusion and butt joint protection are realized; therefore, the bandwidth capacity of the convergence layer and the service bearing efficiency can be improved.
Drawings
Fig. 1 is a schematic diagram of conventional PTN positioning in a network;
fig. 2 is a schematic diagram of a conventional OTN location in a network;
FIG. 3 is a schematic flow chart diagram of a PTN-OTN hybrid networking method in one embodiment;
fig. 4 is a schematic flow chart of a partition manner in the PTN-OTN hybrid networking method in an embodiment;
FIG. 5 is a schematic diagram of region partitioning in one embodiment;
FIG. 6 is a network modeling and partitioning diagram in one embodiment;
fig. 7 is a block diagram of an optical transport network architecture according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The PTN-based optical transport network architecture and the specific technology are as follows: a layer is arranged between IP (Internet Protocol, Protocol for interconnection between networks) service and underlying optical transmission medium, which is designed for the requirement of burst and statistical multiplexing transmission of packet service flow, takes the packet service as a core and supports multi-service provision, has lower TCO (Total Cost of Ownership), and simultaneously inherits the traditional advantages of optical transmission, including high availability and reliability, efficient bandwidth management mechanism and flow engineering, convenient OAM (operation, administration and Maintenance) and network management, and expandable higher security. Fig. 1 is a schematic diagram of a positioning of a PTN in a network at the present stage.
The OTN is a transport network based on wavelength division multiplexing technology and organized in an optical layer, and is a next generation backbone transport network. OTN is standardized by a new generation of recommendations of a series of ITU-ts (ITU-T for ITU Telecommunication Standardization Sector, international Telecommunication union, Telecommunication standards branch) such as g.872, g.709, g.798, "digital transport hierarchy" and "optical transport hierarchy". Referring to fig. 2, the OTN is currently positioned: 1. the OTN is applied to a metropolitan area network core layer and a convergence layer, and mainly bears requirements of SW (switch equipment) uplink BRAS (Broadband Remote Access Server) and GE requirements between core buildings and between counties and city buildings.
The traditional networking mode is based on traditional transmission technologies such as SDH (Synchronous Digital Hierarchy), and mainly adopts a TDM time division multiplexing cross mode, however, for large bandwidth services such as FE (Fast Ethernet), GE (Gigabit Ethernet) and larger-grained IP, the traditional networking mode has the problems of insufficient bandwidth of a convergence layer and low service carrying efficiency.
In current networking, often the core backbone layer (alternatively referred to as the core layer) employs OTN, and the convergence layer and below employ PTN networking. And the OTN is fully utilized to dispatch the uplink service to the service landing site to which the PTN belongs. In the combined networking mode, the OTN is not only a bearing means, but also schedules the GE/10GE service of the upper connection of the backbone nodes and the affiliated cross landing equipment through the OTN, and the number of the GE/10GE channels of the upper connection can be configured according to the total number of the services actually accessed in the PTN as required, so that the network construction between the backbone nodes and the core nodes is greatly simplified, the condition that all node equipment on a loop needs to be upgraded due to the upgrade of the service capacity of a certain node in the PTN independent networking mode is avoided, and the network investment is greatly saved.
The embodiment scheme of the application mainly aims at rapidly expanding network flow, gives full play to respective technical advantages of the PTN and the OTN, combines networking and builds a high-efficiency transmission network.
In one embodiment, as shown in fig. 3, there is provided a PTN-OTN hybrid networking method, including the steps of:
step S301: deploying OTN equipment nodes at a core layer of an optical transport network, wherein the OTN equipment nodes deployed at the core layer gradually sink towards a convergence layer of the optical transport network along with the increase of bandwidth demand;
here, the optical transport network mainly refers to a metropolitan area network, but is not limited to the metropolitan area network. The sinking mode to the convergence layer mainly comprises the following steps: in a first mode, PTN access rings are gathered in a backbone node set; in the second mode, the PTN access rings are scattered and converged at each sink node; and thirdly, the PTN access rings are converged in the ground layer node in a centralized manner. The PTN access rings of all counties and cities of the local network are hung on the ground layer PTN equipment, so that the pressure of the converged access to the ground layer PTN equipment is high, the maintenance is inconvenient, and the occupation of ramp resources on a backbone layer is serious. Therefore, it is preferable that the convergence layer sinks downward in one or two ways.
Step S302: selecting part of nodes in the convergence layer as core nodes, and deploying OTN equipment nodes and PTN equipment nodes at the same time on the selected core nodes, wherein the rest nodes are configured;
in this embodiment, some core nodes in the convergence layer need to be deployed with OTN devices and PTN devices at the same time, so as to implement network convergence and docking protection.
Step S303: and deploying PTN equipment nodes at an access layer of the optical transmission network, and accessing the communication equipment accessed to the access layer to the core layer after the communication equipment is converged by the convergence layer.
In the above-mentioned PTN-OTN hybrid networking method, OTN device nodes are deployed at a core layer of an optical transport network, the OTN device nodes deployed at the core layer gradually sink towards a convergence layer of the optical transport network with an increase in bandwidth demand, a part of nodes in the convergence layer are selected as core nodes, the OTN device nodes and the PTN device nodes are deployed at the same time at the selected core nodes, the PTN device nodes are deployed at an access layer of the optical transport network, and communication devices accessed to the access layer are converged by the convergence layer and then accessed to the core layer. On one hand, OTN equipment nodes deployed in a core layer gradually sink to a convergence layer of the optical transmission network along with the increase of bandwidth demand, so that the requirement of continuously increasing traffic on the bandwidth of the convergence layer can be met, on the other hand, part of nodes in the convergence layer are selected as core nodes, and the OTN equipment nodes and PTN equipment nodes are deployed at the same time on the selected core nodes, so that network fusion and butt joint protection are realized; therefore, the bandwidth capacity and the service bearing efficiency of the convergence layer can be improved, and the requirement of continuously increased service volume on the bandwidth of the convergence layer can be met.
The bandwidth particles of the optical layer are wavelengths, and compared with the scheduling particles of VC-12/VC-4 of SDH, the particles of OTN multiplexing, interleaving, and configuration are significantly larger, and the adaptation capability and transmission efficiency of high-bandwidth data client services can be significantly improved.
In one embodiment, the networking area may be further divided into an integrated service access area, a service convergence area and a service core area according to a hierarchy, and specifically, as shown in fig. 4, the PTN-OTN hybrid networking method further includes the steps of:
step S401: performing first-level region division on the optical transmission network to obtain core regions of all the integrated services;
the integrated service access area is an area which is divided into a plurality of areas capable of independently completing service convergence in urban areas or other service-intensive areas such as developed villages and towns in order to meet various service access requirements of base stations, WLAN (wireless local area network), group customer lines, family broadband and the like and in combination with administrative areas, natural regions, road network structures and customer distribution. Each integrated service access area should include 1-2 service convergence points, 1-4 trunk access cable rings, and several fiber distribution points.
Step S402: respectively carrying out second-level area division on each integrated service core area to obtain each integrated service convergence area corresponding to each service core area;
wherein, 1-2 service convergence nodes are arranged in the integrated service access area, which is generally called as a common convergence engine room. And 1-2 service convergence nodes are arranged in the similar integrated service convergence area, and are generally called as a backbone convergence machine room.
Step S403: and respectively carrying out third-level area division on each integrated service convergence area corresponding to each service core area to obtain each integrated service access area corresponding to each integrated service convergence area.
The nodes in the integrated service convergence area are simultaneously deployed with OTN equipment and PTN equipment to realize network intercommunication and switching, the OTN is deployed in the integrated core area and the convergence area, and the PTN is deployed in the integrated convergence area and the integrated service access area.
Fig. 5 is a schematic diagram of area division in an embodiment, and as shown in fig. 5, the area division is firstly divided into a plurality of integrated service core areas, then each integrated service core area is divided into a plurality of integrated service convergence areas, and finally each integrated service convergence area is divided into a plurality of integrated service access areas, each integrated service access area should include 1-2 service convergence points, 1-4 trunk access cable rings, and a plurality of fiber distribution points. Fig. 6 provides a schematic diagram of area division of an optical transport network architecture adopting PTN-OTN hybrid networking in an embodiment, but fig. 6 is only an example, and a specific division manner is not limited thereto.
By adopting the scheme in the embodiment, with the increase of the bandwidth requirement, the network structure of the partition aggregation is kept unchanged, the equipment form can be developed to the rate of 100GE, 200GE or 400GE, and the packet enhanced OTN technology developed by the fusion of the aggregation node OTN and the PTN can be gradually considered.
In one embodiment, the performing second-level area division on each of the integrated service core areas to obtain each integrated service convergence area corresponding to each of the service core areas respectively includes: acquiring administrative region information, natural area information, road network structure information and customer distribution information; and dividing a target integrated service convergence area into a plurality of integrated service convergence areas by combining the administrative region information, the natural area information, the road network structure information and the client distribution information. Wherein the target integrated service convergence region can be any integrated service convergence region.
In this embodiment, the area division is performed on the integrated service convergence region by integrating the consideration factors of various aspects, so that the reasonability and reliability of the area division can be improved.
As described above, with the increase of bandwidth demand, the OTN device node needs to gradually sink the metro convergence layer of the network. In one embodiment, a step-down method is provided, and in particular, the PTN-OTN hybrid networking method described above may further include: acquiring a current bandwidth demand and an upper bandwidth demand of the optical transport network, where the upper bandwidth demand is the bandwidth demand of the optical transport network before an OTN device node deployed by the core layer sinks to a metropolitan area convergence layer of the optical transport network last time; acquiring an increase amplitude value of the bandwidth demand of the optical transmission network according to the current bandwidth demand and the previous bandwidth demand; and when the amplitude increasing value meets a preset adjusting condition, sinking the OTN equipment node deployed by the core layer to the convergence layer.
In particular, can be according to Ab＝(B2-B1)/B1Calculating an increased amplitude value, wherein AbRepresenting increasing amplitude value, B2Represents the current bandwidth demand, B1Indicating the previous bandwidth demand. The preset adjusting conditions can be set according to actual needs. For example, the amplitude value is increased to be larger than a preset threshold, wherein the size of the preset threshold can be set according to actual needs.
In one embodiment, the PTN-OTN hybrid networking method may further include: and deploying PTN equipment nodes at the rest nodes in the convergence layer, wherein the rest nodes are the equipment nodes except the core node in the convergence layer.
According to the PTN-OTN hybrid networking method, the present application also provides an optical transport network architecture. In one embodiment, as shown in fig. 7, an optical transport network architecture in the embodiment of the present invention includes a core layer 701, an aggregation layer 702, and an access layer 703, where the core layer 701 deploys OTN device nodes to gradually sink to the aggregation layer of the optical transport network as a bandwidth demand increases; a part of nodes in the convergence layer 702 are used as core nodes, and the core nodes are deployed with OTN device nodes and PTN device nodes at the same time; the access layer 703 deploys a PTN device node, and communication devices accessed to the access layer 703 are accessed to the core layer 701 after being converged by the convergence layer 702.
In one embodiment, the optical transport network architecture performs the area division by using the following method: carrying out first-level area division on an optical transmission network architecture to obtain core areas of all the integrated services; respectively carrying out second-level area division on each integrated service core area to obtain each integrated service convergence area corresponding to each service core area; and respectively carrying out third-level area division on each integrated service convergence area corresponding to each service core area to obtain each integrated service access area corresponding to each integrated service convergence area.
In one embodiment, the second-level region dividing manner includes: acquiring administrative region information, natural area information, road network structure information and customer distribution information; and dividing a target integrated service convergence area into a plurality of integrated service convergence areas by combining the administrative region information, the natural area information, the road network structure information and the client distribution information.
In one embodiment, 1 to 2 service convergence nodes are respectively arranged in each integrated service access area, and 1 to 2 service convergence nodes are respectively arranged in each integrated service convergence area.
In one embodiment, each of the integrated service access zones respectively includes 1 to 2 service aggregation points, 1 to 4 trunk access cable rings, and more than one fiber point.
Specific limitations on the architecture of the optical transport network can be referred to the above limitations on the PTN-OTN hybrid networking method, which is not described herein again.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A PTN-OTN hybrid networking method, the method comprising:
deploying OTN equipment nodes at a core layer of an optical transport network, wherein the OTN equipment nodes deployed at the core layer gradually sink towards a convergence layer of the optical transport network along with the increase of bandwidth demand;
selecting part of nodes in the convergence layer as core nodes, and deploying OTN equipment nodes and PTN equipment nodes at the same time in the selected core nodes;
a PTN device node is deployed at an access layer of the optical transmission network, and communication devices accessed to the access layer are accessed to the core layer after being converged by the convergence layer;
acquiring a current bandwidth demand and an upper bandwidth demand of the optical transport network, where the upper bandwidth demand is a bandwidth demand of the optical transport network before an OTN device node deployed by the core layer sinks to the convergence layer of the optical transport network last time;
acquiring an increase amplitude value of the bandwidth demand of the optical transmission network according to the current bandwidth demand and the previous bandwidth demand;
and when the amplitude increasing value meets a preset adjusting condition, sinking the OTN equipment node deployed by the core layer to the convergence layer.
2. The PTN-OTN hybrid networking method according to claim 1, further comprising:
performing first-level region division on the optical transmission network to obtain core regions of all the integrated services;
respectively carrying out second-level area division on each integrated service core area to obtain each integrated service convergence area corresponding to each service core area;
and respectively carrying out third-level area division on each integrated service convergence area corresponding to each service core area to obtain each integrated service access area corresponding to each integrated service convergence area.
3. The PTN-OTN hybrid networking method according to claim 2, wherein the performing second-level area division on each of the integrated service core areas respectively to obtain each integrated service convergence area corresponding to each of the service core areas comprises:
acquiring administrative region information, natural area information, road network structure information and customer distribution information;
and dividing a target integrated service convergence area into a plurality of integrated service convergence areas by combining the administrative region information, the natural area information, the road network structure information and the client distribution information.
4. PTN-OTN hybrid networking method according to claim 1, characterized in that sinking towards the convergence layer is done in the following way:
the PTN access rings are converged in a backbone node set; or,
the PTN access rings are scattered and converged at each convergent node; or,
the PTN access rings are converged in the ground layer node.
5. PTN-OTN hybrid networking method according to claim 4, characterized in that it further comprises:
and deploying PTN equipment nodes at the rest nodes in the convergence layer, wherein the rest nodes are the equipment nodes except the core node in the convergence layer.
6. An optical transport network architecture comprises a core layer, a convergence layer and an access layer, and is characterized in that the core layer deploys OTN equipment nodes, and the OTN equipment nodes deployed by the core layer gradually sink to the convergence layer of the optical transport network along with the increase of bandwidth demand; part of nodes in the convergence layer are used as core nodes, and the core nodes are simultaneously deployed with OTN equipment nodes and PTN equipment nodes; the access layer deploys PTN equipment nodes, and communication equipment accessed to the access layer is accessed to the core layer after being converged by the convergence layer; the optical transport network acquires a current bandwidth demand and an upper bandwidth demand, where the upper bandwidth demand is the bandwidth demand of the optical transport network before the OTN device node deployed by the core layer sinks to the convergence layer last time; acquiring an increase amplitude value of the bandwidth demand of the optical transmission network according to the current bandwidth demand and the previous bandwidth demand; and when the amplitude increasing value meets a preset adjusting condition, sinking the OTN equipment node deployed by the core layer to the convergence layer.
7. The optical transport network architecture of claim 6, wherein the optical transport network architecture is partitioned into regions by:
performing first-level area division on the optical transmission network architecture to obtain core areas of all the integrated services;
respectively carrying out second-level area division on each integrated service core area to obtain each integrated service convergence area corresponding to each service core area;
and respectively carrying out third-level area division on each integrated service convergence area corresponding to each service core area to obtain each integrated service access area corresponding to each integrated service convergence area.
8. The optical transport network architecture of claim 7, wherein the second level of area partitioning comprises: acquiring administrative region information, natural area information, road network structure information and customer distribution information; and dividing a target integrated service convergence area into a plurality of integrated service convergence areas by combining the administrative region information, the natural area information, the road network structure information and the client distribution information.
9. The optical transport network architecture of claim 8, wherein 1 to 2 service convergence nodes are respectively disposed in each of the integrated service access areas, and 1 to 2 service convergence nodes are respectively disposed in each of the integrated service convergence areas.
10. The optical transport network architecture of claim 8 or 9, wherein each of the integrated service access zones comprises 1 to 2 service aggregation points, 1 to 4 trunk access cable rings, and more than one fiber point, respectively.
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