CN100413255C - Network layered model and interlaminar mapping method for optical transmission communication network - Google Patents
Network layered model and interlaminar mapping method for optical transmission communication network Download PDFInfo
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Abstract
The present invention discloses a network layered model for optical transmission communication networks, which comprises two steps, wherein the network is firstly divided into four layers, an optical synchronous transmission net (SDH) layer, an optical transmission net (OTN) layer, a wavelength-division multiplex system (WDM) layer and a physical medium (PHY) layer. The sequence of the network layers is respectively the SDH layer, the OTN layer, the WDM layer and the PHY layer from top to bottom. Secondly, nodes can be grouped, a plurality of node groups can be determined in the network according to whether the nodes are arranged in the same city, the same bureau station, the same floor, etc. Any node in each layer must belong to a node group, a plurality of nodes in the same layer can belong to the same group, and the difference layers of nodes in the same group are provided with corresponding relationship. The present invention has the advantage of realizing the optimized configuration of network resources and saving network construction cost.
Description
Technical field
The present invention relates to fiber optic communication field, especially relate to the network hierarchy model method that is used for optical transmission communication network.The invention still further relates to the interlayer mapping method of this hierarchical mode.
Background technology
Optical transmission communication network planning is meant by a series of technical methods with design, determine technical schemes such as the network topology of optical transmission communication network in building, equipment disposition, trunk bandwidth, business arrangement, make it can solve given business demand, and satisfy constraintss such as rational construction cost, feasible engineering construction and operation maintenance easily.
At present, mostly the planning of optical transmission communications field network is in system level with design, is target with chain, ring type structure; It is target that the planning of network level also only limits to the single layer network with design.The large-scale optical transmission device of majority manufacturer has the network planning and design tool, its conventional planing method for network be divided into equipment, optical cable is two-layer, can carry out the network planning of individual layer in the equipment aspect, the optical cable aspect does not possess the ability of any network planning only as simple risk analysis.
Along with the continuous expansion of optical transmission communication network scale, the planning of network with the design need carry out in each aspect, simultaneously, also need to consider between each aspect influence with cooperate.Address that need, optical transmission communication network design need provide a kind of new method for designing, is used for the formation of more real description network, realizes the multilayer associating planning and designing of optical transmission communication network, satisfying the needs of modern optical transport communication, but yet there are no the report of all relevant this respects.
Summary of the invention
The object of the present invention is to provide a kind of network hierarchy model and interlayer mapping method that is used for optical transmission communication network.
Network hierarchy model and the interlayer mapping method that is used for optical transmission communication network of the present invention comprises the steps:
The first step is divided into following four layers with network:
A, optical synchronous transport network layer, i.e. SDH layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the SDH relevant criterion, and this layer has node, link, professional base attribute;
B, optical transfer network layer, i.e. OTN layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the OTN relevant criterion, and this layer has node, link, professional base attribute;
C, wavelength-division multiplex system layer, i.e. WDM: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the WDM relevant criterion, and this layer has node, link, professional base attribute;
D, physical medium layer, i.e. PHY: this layer is used for describing the optical transmission communication network that adopts optical fiber cable to form, and this layer has node, link, professional base attribute;
The level of above-mentioned each layer network from top to bottom is followed successively by: SDH layer, OTN layer, WDM layer, PHY layer;
Second step, node grouping: in network, whether be positioned at same city, whether be positioned at same office station, whether be positioned at the some node grouping of same storey setting according to node; Arbitrary node must and can only belong to a certain node grouping in each layer, with having a plurality of nodes to belong to same grouping in the layer; Belong between the node of different layers of same grouping corresponding relation is arranged;
The 3rd step, the interlayer mapping:
A, interlayer mapping are with the link on upper strata and the business-binding of lower floor;
The mapping of b, interlayer can only be carried out between two-layer up and down arbitrarily;
Two end points of c, upper strata link must belong to identical node grouping respectively with two end points of following layer service; The necessary rate-matched of the link on upper strata and the business of lower floor; The binding of the link on upper strata and the business of lower floor is to concern one to one.
Described optical synchronous transport network layer is divided into client layer, channel layer, section layer, physical layer from top to bottom.
Described optical transfer network layer is divided into client layer, optical channel layer, light section layer, physical layer from top to bottom.
Owing to adopt technique scheme, make the present invention have the following advantages and effect:
1, can realize the associating planning and designing of the different layerings of optical transmission communication network, technical schemes such as network topology, equipment disposition, trunk bandwidth during thereby more rational definite optical transmission communication network is built, realize optimizing configuration on network resource, save network construction cost.
2, can carry out quantitative fail-safe analysis and risk analysis to network; carry out that the network failure interlayer is stretched and each layer protection recovers the simulation of co-ordination; thereby the requirement of user for service quality satisfied in the protection reset mode of more rational definite business and route arrangement.
Description of drawings
Fig. 1 is an optical transmission communication network hierarchical mode structural representation of the present invention.
Fig. 2 is for adopting a real network instance graph of the method for the invention.
Embodiment
Embodiment 1:
As shown in Figure 1, the network hierarchy model that is used for optical transmission communication network of the present invention comprises the steps:
The first step is divided into following four layers with network:
A, optical synchronous transport network (SDH) layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the SDH relevant criterion, and this layer has base attributes such as node, link, business; Described optical synchronous transport network (SDH) layer is divided into client layer, SDH layer, physical layer from top to bottom; Wherein the SDH layer is divided into channel layer and section layer from top to bottom.
B, optical transfer network (OTN) layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the OTN relevant criterion, and this layer has base attributes such as node, link, business; Described optical transfer network (OTN) layer is divided into client layer, OTN layer, physical layer from top to bottom; Wherein the OTN layer is divided into optical channel layer and light section layer from top to bottom.
C, wavelength-division multiplex system (WDM) layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the WDM relevant criterion, and this layer has base attributes such as node, link, business;
D, physical medium (PHY) layer: this layer is used for describing the optical transmission communication network that adopts optical fiber cable to form, and this layer has base attributes such as node, link, business;
The level of above-mentioned each layer network from top to bottom is followed successively by: SDH layer, OTN layer, WDM layer, PHY layer;
Second step, node grouping: in network, whether be positioned at same city, whether be positioned at same office station, whether be positioned at same floor etc. some node grouping are set according to node; Arbitrary node must and can only belong to a certain node grouping in each layer, with having a plurality of nodes to belong to same grouping in the layer; Belong between the node of different layers of same grouping corresponding relation is arranged.
As shown in Figure 1 and Figure 2, interlayer mapping method of the present invention comprises the steps:
The mapping of a, interlayer can and can only be carried out between two-layer up and down arbitrarily;
B, interlayer mapping are with the link on upper strata and the business-binding of lower floor;
The principle of c, interlayer mapping is: two end points of upper strata link must belong to identical node grouping respectively with two end points of following layer service; The necessary rate-matched of the link on upper strata and the business of lower floor; The binding of the link on upper strata and the business of lower floor is to concern one to one.
Embodiment 2:
As shown in Figure 2, for the present invention is described in further detail, be example with a real network at this, the target that function realizes is to adopt method of the present invention to plan and design to optical transmission communication network as shown in Figure 2.The step that realizes is as follows:
The first step according to the present situation and the demand of network, is divided into four layers with network.Wherein:
The SDH layer: node has A, B, C; Link has A-B, B-C, C-A; Business has A-B.
The OTN layer: node has A, B, C; Link has A-B.
The WDM layer: node has A, B, C; Link has B-C.
The PHY layer: node has A, B, C; Link has A-B, B-C, C-A.
Second step, the link of each layer of network is carried out the interlayer mapping, binding relationship is as follows:
SDH layer: link A-B binding O TN layer service A-B, link B-C binding WDM layer service B-C, link C-A binding PHY layer service C-A.
OTN layer: link A-B binding PHY layer service A-B.
WDM layer: link B-C binding PHY layer service B-C.
The PHY layer: this layer is the transmission medium layer, and link is optical cable segment, need not shine upon.
The 3rd step, the selection of service protection and reset mode
The professional A-B protected mode of SDH is 1+1SNCP; The business that all the other generate because of mapping, its protection and reset mode are unprotect.
The 4th step, professional routing and loading resource
Each layer carries out professional routing from the bottom to top, loads resource.Concrete outcome is as follows:
The PHY layer: professional A-B route is A-B, and professional B-C route is B-C, and professional C-A route is C-A.
The WDM layer: professional B-C route is B-C.
The OTN layer: professional A-B route is A-B.
The 5th step, link and professional risk analysis
Setting risk unit according to optical cable segment is: RU_A-B, RU_B-C, RU_C-A.
According to the binding relationship of each layer service routing situation and interlayer mapping, determine the risk group of a SDH layer link.The RG_C-A={RU_C-A} of the RG_B-C={RU_B-C} of the RG_A-B={RU_A-B} of link A-B, link B-C, link C-A.
The 6th step, link and professional fail-safe analysis
According to the binding relationship of each layer service routing situation and interlayer mapping, can determine link and professional availability by certain Calculation of Availability method.
In the 7th step, business risk is separated Route Selection
The professional A-B protected mode of SDH is 1+1SNCP, adopts risk to separate routing policy, and the common factor of the RG of the link that passes through of the RG of link that the route of promptly working is passed through and protection route is for empty.
The professional A-B work of SDH route is elected A-B as, corresponding RG_A-B_wr={RU_A-B}; The protection route is elected A-C, C-A as, corresponding RG_A-B_pr={RU_C-A, RU_B-C}.Because of RG_A-B_wr ∩ RG_A-B_pr=Φ, so professional A-B work route is separated with protection route risk.
In the 8th step, the network failure interlayer is stretched and each layer protection recovers the simulation of co-ordination
Suppose optical cable segment A-B fault, both RU_A-B lost efficacy; The network failure interlayer is stretched and will be caused OTN layer link A-B, SDH layer link A-B to lose efficacy successively; SDH layer service A-B is switched to protection route A-C, C-A after the work route lost efficacy, professional unaffected.
Operation principle of the present invention is as follows:
One, the selection of service protection and reset mode in the random layer
After the mapping,, can select protection and reset mode between complete layer according to the SLA requirement of professional place client layer for the business in the random layer.
Two, the risk analysis of link in the random layer
Link process optical cable, node, network element such as layer system all can produce fault down, for the network element that may produce fault, is called risk unit (RU-RiskUnit).Mapping and to after down layer service routing, loading resource between complete layer, can be definite know link in the random layer the network element of process, the RU of these network elements is got union, so obtain link the set of risk unit of process, i.e. risk group (RG-RiskGroup).For any one group of link, can be by element (RU) among the corresponding RG relatively being judged whether joint adventure, joint adventure how.
Three, the availability analysis of link in the random layer
Link process optical cable, node, network element such as layer system all has the attribute of availability down.Mapping and to after down layer service routing, loading resource between complete layer, can be definite know link in the random layer the network element of process, and then determine the availability of link by certain Calculation of Availability method.
Four, the risk analysis of business in the random layer
By the risk analysis of link, can determine the risk group of every link in the random layer.After the professional routing in the random layer, loading resource, can be definite know this business the link of process; The RG of these links is got union, and then obtain the RG of professional route.For any one group of business, can be by element (RU) among the corresponding RG relatively being judged whether joint adventure, joint adventure how.
Five, the availability analysis of business in the random layer
By the availability analysis of link, can determine the availability of every link in the random layer.After professional routing in the random layer, loading resource, can be definite know this business the link of process; Can determine professional availability by certain Calculation of Availability method.
Six, separate Route Selection based on the business risk of link risk analysis
Professional protection and reset mode require the work route to separate with protection route, route stand-by risk, cause losing efficacy simultaneously to avoid joint adventure.By the risk analysis of link, can determine the risk group of every link in the random layer.During to the professional routing in the random layer, the RU of RG that can be by making professional route and the RU of protection route, route stand-by occurs simultaneously for empty or occur simultaneously minimumly, realizes that work route and protection route, the strict or maximum risk of route stand-by separate.
Seven, the network failure interlayer is stretched and each layer protection recovers the simulation of co-ordination
Mapping and to after down layer service routing, loading resource between complete layer, can be definite know link corresponding service in lower floor in the random layer; Network failure in the lower floor will influence the business with layer; And then influence the link on upper strata by binding relationship, realize the function that the network failure interlayer is stretched.
When opinion layer in office produced network failure, by the upper strata that interlayer is stretched fault effects is correlated with, the protection that affected each layer will start self respectively recovered, thereby realized the simulation of the co-ordination that each layer protection recovers.
Claims (3)
1. a network hierarchy and interlayer mapping method that is used for optical transmission communication network, it is characterized in that: it comprises the steps:
The first step is divided into following four layers with network:
A, optical synchronous transport network layer, i.e. SDH layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the SDH relevant criterion, and this layer has node, link, professional base attribute;
B, optical transfer network layer, i.e. OTN layer: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the OTN relevant criterion, and this layer has node, link, professional base attribute;
C, wavelength-division multiplex system layer, i.e. WDM: this layer is used for describing the optical transmission communication network of being made up of the equipment that meets the WDM relevant criterion, and this layer has node, link, professional base attribute;
D, physical medium layer, i.e. PHY: this layer is used for describing the optical transmission communication network that adopts optical fiber cable to form, and this layer has node, link, professional base attribute;
The level of above-mentioned each layer network from top to bottom is followed successively by: SDH layer, OTN layer, WDM layer, PHY layer;
Second step, node grouping: in network, whether be positioned at same city, whether be positioned at same office station, whether be positioned at the some node grouping of same storey setting according to node; Arbitrary node must and can only belong to a certain node grouping in each layer, with having a plurality of nodes to belong to same grouping in the layer; Belong between the node of different layers of same grouping corresponding relation is arranged;
The 3rd step, the interlayer mapping:
A, interlayer mapping are with the link on upper strata and the business-binding of lower floor;
The mapping of b, interlayer can only be carried out between two-layer up and down arbitrarily;
Two end points of c, upper strata link must belong to identical node grouping respectively with two end points of following layer service; The necessary rate-matched of the link on upper strata and the business of lower floor; The binding of the link on upper strata and the business of lower floor is to concern one to one.
2. network hierarchy and the interlayer mapping method that is used for optical transmission communication network according to claim 1 is characterized in that: described optical synchronous transport network layer is divided into client layer, channel layer, section layer, physical layer from top to bottom.
3. network hierarchy and the interlayer mapping method that is used for optical transmission communication network according to claim 1 is characterized in that: described optical transfer network layer is divided into client layer, optical channel layer, light section layer, physical layer from top to bottom.
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| WO2003019839A2 (en) * | 2001-08-27 | 2003-03-06 | Pts Corporation | Architectural arrangement for core optical networks |
| CN1104789C (en) * | 1999-10-18 | 2003-04-02 | 北京格林威尔科技发展有限公司 | Method and device for integrating ATM services with STM services |
| US20050122968A1 (en) * | 2000-09-07 | 2005-06-09 | Humair Raza | Architectures for evolving traditional service provider networks and methods of optimization therefor |
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| CN1104789C (en) * | 1999-10-18 | 2003-04-02 | 北京格林威尔科技发展有限公司 | Method and device for integrating ATM services with STM services |
| US20050122968A1 (en) * | 2000-09-07 | 2005-06-09 | Humair Raza | Architectures for evolving traditional service provider networks and methods of optimization therefor |
| WO2003019839A2 (en) * | 2001-08-27 | 2003-03-06 | Pts Corporation | Architectural arrangement for core optical networks |
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