CN101998187B - Information communication device and information communication method - Google Patents
Information communication device and information communication method Download PDFInfo
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- CN101998187B CN101998187B CN200910166792.9A CN200910166792A CN101998187B CN 101998187 B CN101998187 B CN 101998187B CN 200910166792 A CN200910166792 A CN 200910166792A CN 101998187 B CN101998187 B CN 101998187B
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Abstract
The invention discloses an information communication device which can route by using controllable physical restriction. The information communication device controls an optical network, and the optical network consists of a plurality of optical crossing connection equipment which are connected by optical fibers. The information communication device is characterized in that a downstream optical path can be realized by the optical crossing connection equipment provided with a waveform conversion part by controlling the waveform conversion part arranged in the optical crossing connection equipment and used for carrying out conversion output to input light.
Description
Technical field
The present invention relates to optical communication network, especially, relate in optical communication network and use variable physical constraint to carry out information-communication device and the information communicating method of route.
Background technology
Traditional electrical phone network centered by voice service is being transitioned into the telecommunications network centered by data service at present.This development trend requires following transport network must effectively carry out Route Selection and dynamic bandwidth allocation, to guarantee to transmit different business, and promptly recovers when network or link failure.
In order to adapt to this demand, as the Fibre Optical Communication Technology of transport network core, will be transitioned into ASON from synchronous digital hierarchy (SDH), its topological structure also from point to points topology develop into mesh topology.The ASON (ASON) that international telecommunication union telecommunication's standard group (ITU-T) proposes has become the mainstream technology in domestic ASON.The main feature of ASON is to support to have client's network element of different business kind class feature, and can be according to the demand of service distribution pattern dynamic change in network, by signaling system or the autonomous foundation of management plane or dismounting optical channel.
ASON network architecture comprises transmission plane, control plane and management plane.It transmits plane and conventionally uses wavelength division multiplexing (WDM) terminal equipment, Optical Add Drop Multiplexer (OADM) equipment and optical cross connect (OXC) equipment.Wherein light interleaving techniques exchange velocity is fast, granularity is large, low in energy consumption, crosstalk little, there is good Electro Magnetic Compatibility; its use makes network have extremely strong reconfiguring and protection, recovery characteristics; can carry out wavelength level, wavestrip level and optical fiber level recombinates flexibly; wavelength business end to end particularly can be provided; make operator sell easily bandwidth, cut operating costs.
The control plane of ASON network can be used the general multiple protocols label exchange (GMPLS) being proposed by Internet standard operation group (IETF).GMPLS is the product that traditional multiprotocol label switching (MPLS) is expanded to optical-fiber network, and it has also done to revise and expand to original Routing Protocol, signaling protocol when supporting packet switching, time-division switching, wavelength exchange and optical fiber exchange.When operator need to set up or remove optical channel, use the routing algorithm for example retrain shortest-path first algorithm (CSPF) to obtain the path of optical channel, and set up or the signaling procedure of dismounting with GMPLS message execution route.
CSPF algorithm has increased constraints on the basis of shortest-path first algorithm (SPF), to guarantee that result of calculation can meet certain constraint requirements.Traditional constraints comprises bandwidth, delay time and jitter etc.In US patent 7,324,453 (in January, 2008) " Constraint-based shortestpath first method for dynamically switched optical transportnetworks ", CSPF algorithm be have been introduced.Consider and transmit plane to the trend of all optical network development, the physical characteristic of optical channel also becomes the constraints that CSPF algorithm need to be considered.In OFC2008 meeting paper " Optical Path Computation Element interworking with NetworkManagement System for Transparent Mesh Networks ", used the physical damnification of the optical channel of Optical Signal To Noise Ratio (OSNR) and polarization mode disperse (PMD) for example as the constraint in CSPF algorithm.Wavelength continuity also can be used as the constraint in CSPF algorithm in addition.
Fig. 1 has illustrated the optical network structure block diagram based on optical cross connect (OXC) of prior art.Optical-fiber network in figure consists of 6 LSRs (LSR) 10, between LSR 10 by connecting into ring topology by optical fiber link 20.Each LSR 10 is included in IP layer to carry out IP bag route and realizes the router one 01 of optical-fiber network key-course function, and there is Optical Equalizer (OE) 1021 in physical layer, carry out the optical cross connect (OXC) 102 of light exchange.Optical Equalizer 1021 is wherein for compensated optical signal through the suffered signal impairment of optical fiber link 20, and its parameter value is fixing nonadjustable.Optical Equalizer 1021 can be the fixedly dispersion compensator that adopts dispersion compensating fiber, or the image intensifer of fixed gain.For example, for the G.652 optical fiber link of common 80km span, as the desirable dispersion measure of the dispersion compensator of Optical Equalizer 1021, be-1360ps/nm.Yet lay distance because the compensator accuracy of manufacture, link are actual, come in and go out, and the reasons such as link dispersion variation brought of variation of ambient temperature, in real network, always exist certain residual dispersion, and along with the time slowly changes.Along with the raising of network Development and transmission rate, such residual dispersion causes systematic function, and to affect meeting more and more serious.Again for example, for the G.652 optical fiber link of common 80km span, as Optical Equalizer 1021 to mix jade or pearl earring fiber amplifier (EDFA) the perfect Gain be 24dB.Yet due to the transmit power variation that link active loss is come in and gone out, transmitter variations in temperature causes, and the reasons such as change in gain brought of channel number increase and decrease, in real network, always exist certain through-put power to change, and systematic function is impacted.
Summary of the invention
Therefore, from more long-range technical development, in following optical-fiber network, can adopt dynamic Optical Equalizer (OE) to improve channel physical damnification, for example adopt the adjustable dispersion compensation device of fiber grating to carry out fine compensation to residual dispersion, or utilize the wavelength shifter of semiconductor optical amplifier to carry out wavelength conversion to meet path wavelength continuity requirement.Yet in current CSPF algorithm, all links as retraining in algorithm and the parameter value of Optical Equalizer are fixed value, can not show the tuning range of above dynamic optical equalizer, therefore cannot when selecting paths, utilize dynamic optical equalizer to the physically impaired improvement of channel.
The object of the invention is to solve above-mentioned technical task, a kind of information-communication device that can utilize dynamic optical equalizer to improve the physical damnification of channel when Path selection is provided.For solving above-mentioned technical task, the present invention proposes a kind of information-communication device that uses controlled physical constraint to carry out route, optical-fiber network is controlled, this optical-fiber network is by a plurality of optical cross-connection equipments are connected to the optical-fiber network forming with optical fiber, this information-communication device is characterised in that: by control in above-mentioned optical cross-connection equipment, have, input light convert to the waveform transformation portion exporting, thereby can be utilized by the optical cross-connection equipment with above-mentioned waveform transformation portion the light path in downstream.
Described information-communication device has: topological diagram memory cell, and storage represents the topological diagram of network topological information; Data storage cell, for a plurality of parameters that can have in described optical cross-connection equipment, input light is converted to the waveform transformation portion adjustment of output, the scope that each parameter value of storage current time and this parameter can be adjusted; Path-calculating element, can the light path that calculate downstream be utilized by described optical cross-connection equipment at current time; And control unit, by adjusting the parameter of appointment in described a plurality of parameter, thereby described light path can be utilized.
A plurality of parameters of described data storage cell storage comprise respectively the situation that can node, input port, output port, Optical Equalizer type, link parameter and node use.
Described link parameter comprises minimum value, maximum, interval and currency.
Described path-calculating element is asked for path by the described parameter of storing in the described topological diagram of storing in described topological diagram memory cell and described data storage cell.
Described control unit is controlled described path-calculating element, so that described path-calculating element carrys out calculating path with the parameter value after the renewal of storing in described data storage cell.
Described control unit, in the situation that the path that described path-calculating element calculates can not be utilized, upgrades the parameter value of the current time of storing in described data storage cell.
In the situation that described path-calculating element used described parameter likely do not obtain yet the path that needs after value, described control unit is judged as and does not find path.
Described path-calculating element is the public path computation service devices of a plurality of described information-communication devices.
Described information-communication device is router.
In addition, the present invention also provides a kind of communication means of information-communication device, this information-communication device is controlled optical-fiber network, this optical-fiber network is by a plurality of optical cross-connection equipments are connected to the optical-fiber network forming with optical fiber, this communication means is characterised in that, when the control unit having in described information-communication device is judged path that the path-calculating element that has in described information-communication device calculates and can not be utilized, control the parameter value that the data storage cell having in described information-communication device upgrades the current time of the parameter of storing in this data storage cell, and control described path-calculating element and use the above-mentioned parameter value after upgrading to recalculate path.
Described path-calculating element is the public path computation service devices of a plurality of described information-communication devices.
Adopt information-communication device of the present invention and the information communicating method of said structure can effectively carry out Route Selection and dynamic bandwidth allocation, to guarantee to transmit different business, and promptly recover when network or link failure.
Accompanying drawing explanation
Fig. 1 is the optical network structure block diagram based on optical cross connect (OXC) of prior art;
Fig. 2 is according to the LSR of embodiment 1 (LSR) structured flowchart;
Fig. 3 is the light cross connecting structure block diagram with Optical Equalizer (OE) according to embodiment 1;
Fig. 4 is the path computing flow chart according to embodiment 1;
Fig. 5 is according to the matrix of the expression network topology of embodiment 1;
Fig. 6 is the Optical Equalizer parameter list according to embodiment 1;
Fig. 7 is the sequential chart that tag distribution protocol (LDP) signaling is controlled Optical Equalizer parameter that passes through according to embodiment 1;
Fig. 8 arranges and optical cross connect parameter updating message structure according to the optical cross connect parameter of embodiment 1;
Fig. 9 is the optical network structure block diagram based on optical cross connect (OXC) according to embodiment 2;
Figure 10 is the sequential chart that tag distribution protocol (LDP) signaling is controlled Optical Equalizer parameter that passes through according to embodiment 2.
Embodiment
Fig. 1-8 have illustrated system and device structure, algorithm flow, message time sequence and the data structure of embodiment 1.What embodiment 1 adopted is distributed control plane, and its path computing is completed by the ingress edge router (ingress provider edge router) of load flow, and different load flow is corresponding to different ingress edge routers.And each edge router in network has such control plane and path computation function, can become ingress edge router.
The optical network structure based on optical cross connect (OXC) of embodiments of the invention 1 is also with reference to shown in Fig. 1.6 LSRs of optical-fiber network (LSR) in figure 10 form, between LSR 10 by connecting into ring topology by optical fiber link 20.Each LSR 10 is included in IP layer to carry out IP bag route and realizes the router one 01 of optical-fiber network key-course function, and there is Optical Equalizer (OE) 1021 in physical layer, carry out the optical cross connect (OXC) 102 of light exchange.But unlike the prior art, Optical Equalizer 1021 is wherein dynamic-tunings, for the suffered signal impairment of compensated optical signal process optical fiber link 20.Optical Equalizer 1021 can be the adjustable dispersion compensation device that adopts fiber grating, utilizes the wavelength shifter of semiconductor optical amplifier and utilize full light regenerator of high non-linear photon crystal optical fiber etc.Data in network are light signal in physical layer, by optical cross connect 102, mainly with the form of light signal, carry out coarsegrain (for example wavelength) exchange.The data that part needs small grain size (for example virtual circuit) exchange in optical cross connect 102 after opto-electronic conversion the form with the signal of telecommunication exchange, wherein need the data further processed to be upwards transferred to router one 01 by the circuit between router one 01 and optical cross connect 102 and carry out the IP layers such as route, queuing, shaping and process.The control plane function of LSR 10 realizes in router one 01, so the behavior of optical cross connect 102 is controlled by router one 01.
Fig. 2 is according to the LSR of embodiment 1 (LSR) structured flowchart.LSR is included in the router one 01 that IP layer carries out IP bag route and realizes optical-fiber network key-course function, and the optical cross connect 102 of carrying out light exchange in physical layer.Router one 01 is connected with OXC control signal path 10 4 by data channel 103 with optical cross connect 102.Wherein the detailed structure of optical cross connect 102 is by shown in Figure 3.
Router one 01 further comprises the topological diagram memory 1011 of storage networking topology information, according to network topology and OE parameter, carry out the path-calculating element 1012 that path computing obtains label switched path, Open Shortest Path First for acquiring and maintaining network topological information (OSPF) protocol module 1013, carry out tag distribution protocol (LDP) protocol module 1014 of the signaling procedures such as label switched path foundation or dismounting, store the OE parameter list reservoir 1015 of the state information of OE in each optical cross connect, carry out packet encapsulation, the ICP/IP protocol module 1016 of parsing and IP route, and the OXC control module 1017 that produces OXC control signal 104 according to path computing result.After router one 01 starts, OSPF1013 and LDP 1014 set up dialogue with the corresponding module of neighbor router respectively, data between them transmit sending to optical cross connect 102 after TCP/IP 1016 encapsulation and route, and when arrival neighbor router, from optical cross connect, upload to the corresponding module of neighbor router.OSPF 1013 is set up and is safeguarded the topological diagram in topological diagram memory 1011 by neighbours' discovery feature and broadcast topology function, makes each router one 01 maintain a topological diagram that universe is consistent.The OE parameter list in OE parameter list reservoir 1015 is set up and safeguarded to LDP 1014 use OE parameter broadcast capabilitys, similarly, makes each router one 01 maintain an OE parameter list that universe is consistent.When network topology or OE parameter change, this change propagation is called as convergence time to the time on all-router in territory.
After completing topological diagram memory 1011 and OE parameter list reservoir 1015 initialization procedures, the path that path-calculating element 1012 can produce according to the load flow arriving be set up demand and carry out calculating path, and in computational process, uses topological diagram in topological diagram memory 1011 and the OE parameter list (referring to the flow chart in Fig. 4) in OE parameter table stores device 1015.The result of calculation of path-calculating element 1012 is to comprise that each that form path jumps the routing information of the set of LSR, may comprise in addition in addition the Optical Equalizer tuning information of the set of Optical Equalizer that needs are tuning and target values for tuning thereof.Path-calculating element 1012 directly sends to LDP 1014 routing information, carries out path set up signaling procedure (referring to the sequential chart in Fig. 7) by LDP 1014 transmission label request messages (referring to the message format of Fig. 8).Simultaneously, path-calculating element 1012 is updated to Optical Equalizer tuning information in OE parameter list reservoir 1015, if needing tuning Optical Equalizer is the Optical Equalizer in the optical cross connect of this node, by OXC, controlling 1017 control optical cross connects 102 carries out tuning, if needing tuning Optical Equalizer is the Optical Equalizer in other node optical interconnection, by LDP 1014 transmission OXC parameters, message (referring to the message format of Fig. 8) is set and informs this node (referring to the sequential chart in Fig. 7).If LDP 1014 receives the OXC parameter from other node message is set, according to the OE parameter list in the OE parameter list reservoir 1015 in this node of information updating, and according to the message of receiving, by OXC control module 1017, control optical cross connects 102 and carry out tuning.In addition, LDP 1014 is responsible for the variation of the OE parameter list in OE parameter list reservoir 1015 to broadcast to neighbor node by OXC parameter updating message, consistent to maintain universe.
Fig. 3 is the light cross connecting structure block diagram with Optical Equalizer (OE) according to embodiment 1.Optical cross connect 102 has hierarchy, according to exchange granule size, comprises successively optical fiber level, wavestrip level, wavelength level and circuit level switching part.Be connected to 102 1 groups of optical fiber links of optical cross connect and first in optical fiber interconnection (FXC) 1022, carry out the exchange of optical fiber level, in 1023 pairs of optical fiber of OE1, all light signals carry out equilibrium treatment simultaneously simultaneously.Need the data-signal of less exchange granularity to be switched on the multiplexing demultiplexing device 1025 and 1026 being connected with wavestrip interconnection (BXC) 1024, and in wavestrip interconnection 1024, carry out the exchange of wavestrip level, in 1027 pairs of wavestrips of OE2, all light signals carry out equilibrium treatment simultaneously simultaneously.Need the data-signal of less exchange granularity to be switched on the multiplexing demultiplexing device 1029 and 1030 being connected with wavelength interconnection (WXC) 1028, and in wavelength interconnection 1028, carry out the exchange of wavelength level, in 1031 pairs of wavelength of OE3, all light signals carry out equilibrium treatment simultaneously.Finally, the data-signal that needs less exchange granularity or need IP layer to process be switched to electric interconnection (EXC) 1032 on, and carrying out the exchange of circuit level convert the signal of telecommunication in electric interconnection 1032 after, the data-signal that wherein needs IP floor to process sends to router one 01 by up/down road device (A/D) 1033.Otherwise the data-signal coming from IP floor enters into data-transmission channel by up/down road device 1033, passes through successively electric interconnection 1032, wavelength interconnection 1028, wavestrip interconnection 1024 and optical fiber interconnection 1022, send on outlet optical fiber.
Optical Equalizer OE1 1023 in Fig. 3, OE2 1027 need to process a plurality of wavelength simultaneously, therefore can be multichannel adjustable dispersion compensation device or fiber amplifier, and OE3 1031 is single wavelength devices, can be single channel adjustable dispersion compensation device, wavelength shifter and full light regenerator.Optical Equalizer OE1 1023, OE2 1027 and OE3 1031 have tuning range and precision separately, in controlled tuning range, are subject to OXC control signal 104 controls from the OXC control module 1017 of router one 01.It should be noted that, shown in Fig. 3 is an optical cross connect that comprises complete exchange level, in actual applications, optical cross connect usually only includes part exchange level according to different demands, for example, only comprise wavelength level and circuit level exchange (module 1029-1033).In addition, light signal can be that one-way communication can be also two-way communication in optical fiber link and optical cross connect.
Fig. 4 is the path computing flow chart according to embodiment 1.After completing topological diagram memory 1011 and OE parameter list reservoir 1015 initialization procedures, the path that path-calculating element 1012 can produce according to the load flow arriving is set up demand and is carried out calculating path.First program obtains the copy of the topological diagram in the topological diagram memory 1011 of being set up by OSPF 1013 in step 401, according to current topological diagram, calculate shortest path and obtain path 1 (step 402), the algorithm that wherein calculates use can be dijkstra's algorithm.Then whether the path 1 of programmed decision step 402 result of calculation is empty (step 403), if result of determination is yes, show to set up desired path, program is made as vacation (step 404) backed off after random program (step 415) by the sign that finds path.If instead result of determination is no, program enters step 405, copy to topological diagram is pruned (referring to G.Liu and K.G.Ramakrishnan, " A*Prune:An Algorithm for Finding K Shortest PathsSubject to Multiple Constraints; " INFOCOM 2001.), namely according to constraints, the path that does not meet constraint in topology is cut off, then the topological diagram after pruning is recalculated to shortest path with dijkstra's algorithm, obtain path 2 (step 406).Then whether the path 2 of programmed decision step 406 result of calculation is empty (step 407), if result of determination is no, show to find desired path and do not need any Optical Equalizer to carry out tuning, program is made as very (step 408) backed off after random program (step 415) by the sign that finds path.
If instead the result of determination of step 407 is yes, show that some path (path 1) that meets topology requirement does not meet constraint requirements, is pruned away in step 405.Next need to consider that tuned light equalizer attempts to make these paths that pruned away to become and can meet constraints, so program enters step 409, according to Optical Equalizer type suitable in restricted selection network, for example, if constraint is maximum residual dispersion, select adjustable dispersion compensation device, if constraint is wavelength continuity, select wavelength shifter, if constraint is Optical Signal To Noise Ratio, select full light regenerator.Usually, in once calculating, only consider a kind of main constraints.If there is a plurality of constraints, need each constraint carry out a deuterzooid algorithm and get resultful common factor.Selected after Optical Equalizer type, program reads the OE parameter list (step 410) in OE parameter list reservoir 1015, and check on the included all nodes in the path 1 obtain whether have available Optical Equalizer (step 411, referring to the OE parameter list in Fig. 6) in step 402.If check result is no, show that all Optical Equalizers on the included all nodes in path 1 are all unavailable, cannot make path 1 meet constraint, so program is made as vacation (step 404) backed off after random program (step 415) by the sign that finds path.
If instead the check result of step 411 is yes, show likely to regulate the Optical Equalizer on included certain or some node in path 1 to make path 1 meet constraint, therefore program enters step 412, according to the tuning step-length of each Optical Equalizer, progressively increase and decrease/reduce, namely change the physical damnification value on path 1, for example residual dispersion or Optical Signal To Noise Ratio, and the constraint of calculating path 1 again.Then whether programmed decision meets constraint (step 413) in the path 1 of Optical Equalizer being carried out after tuning, if result of determination is yes, show that the path 1 that Optical Equalizer is carried out after tuning can meet constraint, program is made as very (step 408) backed off after random program (step 415) by the sign that finds path.If instead result of determination is no, show that path 1 does not still meet constraint, the institute that whether programmed decision had attempted all available light equalizers on path 1 is parameter value (step 414) likely, if result of determination is no, returning to step 412 continues Optical Equalizer parameter value to increase and decrease/reduce, until find the Optical Equalizer parameter value (step 413 is judged to be and is) that makes path 1 meet constraint, or until the result of determination of step 414 is yes, show to make path 1 meet constraint by tuned light equalizer.
The circulation consisting of step 412-414 is the institute of all available light equalizers parameter value likely on scanning pattern 1 progressively, thereby find, likely make path 1 meet the Optical Equalizer parameter value of constraint, and the path 1 of the satisfied constraint that becomes under this parameter value.The Optical Equalizer tuning information of path-calculating element 1012 using the former as the set of Optical Equalizer target values for tuning, and the latter is outputed to LDP1014 and OE parameter list reservoir 1015 as the routing information that comprises the set of each the jumping LSR that forms path.If program exited before step 412, or exit for be in the situation that in step 414 result of determination, the Optical Equalizer tuning information of output be sky, shows not need tuning Optical Equalizer.If program is made as fictitious time in the sign that finds path and exits, or exit for be in the situation that in step 414 result of determination, the routing information of output is empty, shows the path not meeting the demands.
The network of take in Fig. 1 is example, supposes that LSR1 need to initiate to set up a path that arrives successively LSR4 after LSR2 and LSR3.Active link (weight is less than infinity) in the topological diagram matrix that ring topology from figure obtains is V
12, V
23, V
34, V
45, V
56, V
61, suppose that the weight of these 6 links is 1, be restricted to link residual dispersion, value is followed successively by 100ps/nm, 200ps/nm, 100ps/nm, 150ps/nm, 250ps/nm, 200ps/nm.According to SPF (SPF) algorithm, possible path from LSR1 to LSR4 has two, be respectively path 1{LSR1-LSR2-LSR3-LSR4} and path 2{LSR1-LSR6-LSR5-LSR4}, their restriction is respectively included link limitations sum, wherein the limits value in path 1 is 400ps/nm, and the limits value in path 2 is 600ps/nm.If the path of network settings is restricted to the absolute value of path link residual dispersion, must be less than 800ps/nm, two paths all meet restriction, and CSPF algorithm will select one as result of calculation, to export at random from path 1 and path 2.If the path of network settings restriction is further strict, the absolute value that becomes path link residual dispersion must be less than 500ps/nm, only has path 1 to meet restriction, and CSPF algorithm 1 is exported path as result of calculation.If the restriction of the path of network settings is further strict, the absolute value becoming as path link residual dispersion must be less than 300ps/nm, path 1 and path 2 all do not meet restriction, because the link residual dispersion in legacy network is fixed value, can not regulate, so traditional CSPF algorithm output dead circuit footpath, does not namely have reachable path, so this calling gets clogged.And path-calculating element 1012 in the present invention will be inquired about OE parameter list (referring to the OE parameter list in Fig. 6) in this case, discovery has the Optical Equalizer of available dispersion compensator type in node 3, its dispersion tuning range is-arrive-400ps/nm of 800ps/nm, tuning step-length is 5ps/nm, and parameter current value is-400ps/nm.The calculating of the circulation forming through step 412-414 in program, find when the value of this Optical Equalizer during for-400ps/nm the restriction value in path 1 be 0, limit in the path that can meet network.So algorithm using path 1 as routing information output, and using the Optical Equalizer value of node 3 be-400ps/nm exports as Optical Equalizer tuning information.
Adopt above-mentioned algorithm, can make network can utilize the characteristic of dynamic optical equalizer to improve channel physical damnification, thereby make originally cannot meet, to the path of physically impaired constraint, can meet constraint through becoming after Optical Equalizer, increase the route flexibility of network, reduce and set up the blocking rate in path, and increase network utilization.
Fig. 5 is according to the matrix of the expression network topology of embodiment 1.Each element of matrix is an array, is illustrated in two links between node.Vi for example, j represents the link between node i and node j, Vi wherein, the weight of first this link of element representation of j, when there is no directly connected link between node i and node j, this weighted value be infinity.Vi, second element of j is to the value of one or more restrictions of last this link of element representation.For example, when network is considered link delay and residual dispersion, Vi, second element and the 3rd element of j can be the time delay of this section of link and the value of residual dispersion successively.The method of calculating the constraint on certain paths is that all matrix elements corresponding to link that this paths is comprised neutralize this and retrain corresponding restriction value and be added.
Fig. 6 is the Optical Equalizer parameter list according to embodiment 1.The row of form from left to right represent to be connected in the node, optical cross connect at Optical Equalizer place input port, output port, the type of Optical Equalizer, the link parameter of Optical Equalizer of Optical Equalizer successively, and the whether available sign of Optical Equalizer.Wherein the type of Optical Equalizer can comprise dispersion compensator (DC), wavelength shifter (WC) and regenerator (RGN), the link parameter of Optical Equalizer further comprises minimum value, maximum, the tuning step-length (interval) of Optical Equalizer parameter value scope, and parameter current value.For example the first row is illustrated in the Optical Equalizer that has available dispersion compensator type in node 3, its input port is the port one 0 of optical cross connect, output port is the port 20 of optical cross connect, its dispersion tuning range is-arrive-400ps/nm of 800ps/nm, tuning step-length is 5ps/nm, and parameter current value is-400ps/nm.The second line display has the Optical Equalizer of occupied dispersion compensator type in node 2, its input port is the port one 0 of optical cross connect, output port is the port 20 of optical cross connect, its dispersion tuning range is-arrive-200ps/nm of 600ps/nm, tuning step-length is 5ps/nm, and parameter current value is-350ps/nm.The third line is illustrated in the Optical Equalizer that has available wavelength shifter type in node 2, its input port is the port one 1 of optical cross connect, output port is the port 21 of optical cross connect, its output wavelength tuning range is that 1529.94nm is to 1569.18nm, tuning step-length is 0.82nm, and parameter current value is 1529.94nm.Fourth line is illustrated in the Optical Equalizer that has available regenerator type in node 3, its input port is the port one 0 of optical cross connect, the port 20 that output port is optical cross connect, and its output Optical Signal To Noise Ratio tuning range is 10 to 20, tuning step-length is 0.1, and parameter current value is 10.
Fig. 7 is the sequential chart that tag distribution protocol (LDP) signaling is controlled Optical Equalizer parameter that passes through according to embodiment 1.In figure, suppose that LSR1 need to initiate to set up a path that arrives successively LSR4 after LSR2 and LSR3, and need to regulate the Optical Equalizer parameter value in LSR3.When system initialization, between LSR1-4, send mutually hello message 701-703, make LSR1-4 by discovering neighbor (step 704), set up network topology simultaneously.After initialization completes, LSR1 receives the new data stream (step 705) from client's subnet on the port that is for example connected to client's subnet, thereby carry out the path computing (step 706) of flow chart description in Fig. 4, Optical Equalizer tuning information in the result obtaining shows to regulate the Optical Equalizer parameter value in LSR3, and routing information shows that available path is for to start to arrive LSR4 successively after LSR2 and LSR3 from LSR1.Therefore first LSR1 arranges message 707 with the form of IP bag to LSR3 transmission OXC parameter.When LSR3 receives OXC parameter, arrange after message, the Optical Equalizer target values for tuning comprising according to message arranges the Optical Equalizer parameter value (step 708) of this node and upgrades the OE parameter list (step 709) of this node.Then LSR3 by broadcast OXC parameter updating message 710 notify other node oneself regulated Optical Equalizer and this Optical Equalizer occupied.LSR1, LSR2 and LSR4 upgrade the OE parameter list (step 711) of this node after receiving message.
Then the node that the form that LSR1 wraps with IP comprises along routing information sends label request message 712 to LSR4.LSR2, LSR3 and LSR4 are receiving the rear connection (step 713-715) that OXC is separately set respectively of label request message 720.LSR4 receive after label request message 720 for label of this path allocation and in label mapping message 716 the upper hop LSR3 to it send this label, LSR3, LSR2 after receiving respectively from the label mapping message of its down hop also to upper hop distributing labels separately and send label mapping message 717,718.Last LSR1 receives the foundation that completes path after the label that LSR2 distributes, and LSR1 starts that a data flow 719 of receiving is stamped to the backward path of setting up of this label and forwards.Notice that the label that each node distributes to upper hop can be different, and these labels are effectively local, that is to say that the label value in label mapping message 716,717 and 718 is can be reusable.
Fig. 8 arranges and optical cross connect parameter updating message structure according to the optical cross connect parameter of embodiment 1.Message comprises version number, data protocol unit (PDU) length of 2 bytes, the LDP ID of 6 bytes, the type of message of the unknown message position of 1 bit, 7 bits, the message id of the message-length of 1 byte, 4 bytes of 2 bytes, and the message parameter of 4 bytes.Wherein type of message is for distinguishing different message, for example 0x0001,0x0100,0x0200,0x0201,0x0300,0x0301,0x0400,0x0401,0x0404,0x0402,0x0403,0x0501,0x0502 represent respectively that error notification, neighbours' discovery and maintenance, the negotiation of session parameter, the maintenance of session, address binding, address unbind, label mapping, label request, regain that label request, label are cancelled, label discharges, the setting of OXC parameter, the renewal of OXC parameter.Wherein the setting of OXC parameter or OXC parameter updating message can be inserted in message parameter needs Optical Equalizer parameter value and the corresponding node number of Optical Equalizer and port numbers renewal or that upgraded.
Fig. 9-10 have illustrated system configuration and the message time sequence of embodiment 2.Because the present embodiment has device structure, algorithm flow and the data structure identical with embodiment 1, repeat no more here.What embodiment 2 adopted is centralized control plane, its path computing is completed by path-calculating element (PCE) server, path-calculating element server is notified corresponding ingress edge router result of calculation, then the signaling procedure that is carried out path foundation/dismounting by each hop router on path.
Fig. 9 is the optical network structure block diagram based on optical cross connect (OXC) according to embodiment 2.10 and path-calculating element servers of 6 LSRs of optical-fiber network (LSR) 30 in figure form, between LSR 10 by connecting into ring topology by optical fiber link 20, between LSR 10 and path-calculating element server 30, by link 40, be connected in addition, its link 40 can be that physical link can be also the virtual connections in optical fiber link 20.Each LSR 10 is included in IP layer to carry out IP bag route and realizes the router one 01 of optical-fiber network key-course function, and there is Optical Equalizer (OE) 1021 in physical layer, carry out the optical cross connect (OXC) 102 of light exchange.Optical Equalizer 1021 is wherein dynamic-tunings, for the suffered signal impairment of compensated optical signal process optical fiber link 20.Optical Equalizer 1021 can be adjustable dispersion compensation device, wavelength shifter and full light regenerator etc.The part control plane function of LSR 10 realizes in router one 01, and its path computation function realizes in path-calculating element server 30, therefore the behavior of optical cross connect 102 is by router one 01 and path-calculating element server 30 co-controllings, namely, router one 01 is controlled optical cross connect 102 according to the path computing result of path-calculating element server 30.
Figure 10 is the sequential chart that tag distribution protocol (LDP) signaling is controlled Optical Equalizer parameter that passes through according to embodiment 2.In figure, suppose that LSR1 need to initiate to set up a path that arrives successively LSR4 after LSR2 and LSR3, and need to regulate the Optical Equalizer parameter value in LSR3.When system initialization, LSR1-4 sends hello message 901-904 to path-calculating element server, makes path-calculating element server obtaining information set up network topology (step 905).After initialization completes, LSR1 receives the new data stream (step 906) from client's subnet on the port that is for example connected to client's subnet, thereby to path-calculating element server path computation request message 907 (with reference to RFC 4655:APath Computation Element (PCE)-Based Architecture), make path-calculating element server execution route calculate (step 908), Optical Equalizer tuning information in the result obtaining shows to regulate the Optical Equalizer parameter value in LSR3, and routing information shows that available path is for to start to arrive LSR4 successively after LSR2 and LSR3 from LSR1.Therefore first path-calculating element server arranges message 909 with the form of IP bag to LSR3 transmission OXC parameter.When LSR3 receives OXC parameter, arrange after message, the Optical Equalizer target values for tuning comprising according to message arrange this node Optical Equalizer parameter value (step 910) and to path-calculating element server send OXC parameter updating message 911 notification path computing unit servers oneself regulated Optical Equalizer and this Optical Equalizer occupied.Path-calculating element server is received parameter updating message 911 rear renewal OE parameter list (step 912).
Then the routing information that path-calculating element server can be used to LSR1 path computation answer message 913 notice LSR1 and the signaling procedure that can start path foundation.The node that the form that LSR1 wraps with IP comprises along routing information sends label request message 914 to LSR4.LSR2, LSR3 and LSR4 are receiving the rear connection (step 915-917) that OXC is separately set respectively of label request message 914.LSR4 receive after label request message 914 for label of this path allocation and in label mapping message 918 the upper hop LSR3 to it send this label, LSR3, LSR2 after receiving respectively from the label mapping message of its down hop also to upper hop distributing labels separately and send label mapping message 919,920.Last LSR1 receives the foundation that completes path after the label that LSR2 distributes, and LSR1 starts that a data flow 921 of receiving is stamped to the backward path of setting up of this label and forwards.Notice that the label that each node distributes to upper hop can be different, and these labels are effectively local, that is to say that the label value in label mapping message 918,919,920 is can be reusable.
Claims (10)
1. an information-communication device, controls optical-fiber network, and this optical-fiber network is that this information-communication device is characterised in that by a plurality of optical cross-connection equipments are connected to the optical-fiber network forming with optical fiber:
By control in described optical cross-connection equipment, have input light convert to the waveform transformation portion exporting, thereby can be utilized by the optical cross-connection equipment with described waveform transformation portion the light path in downstream,
This information-communication device has:
Topological diagram memory cell, storage represents the topological diagram of network topological information;
Data storage cell, a plurality of parameters of adjusting for the waveform transformation portion that converts output to inputting light that can have in described optical cross-connection equipment, the scope that each parameter value of storage current time and this parameter can be adjusted;
Path-calculating element, can the light path that calculate downstream be utilized by described optical cross-connection equipment at current time; And
Control unit, by adjusting the parameter of appointment in described a plurality of parameter, thereby can utilize described light path;
A plurality of parameters of described data storage cell storage comprise respectively the situation that can node, input port, output port, Optical Equalizer type, link parameter and node use.
2. information-communication device according to claim 1, is characterized in that,
Described link parameter comprises minimum value, maximum, interval and currency.
3. information-communication device according to claim 1, is characterized in that,
Described path-calculating element is asked for path by the described parameter of storing in the described topological diagram of storing in described topological diagram memory cell and described data storage cell.
4. information-communication device according to claim 1, is characterized in that,
Described control unit is controlled described path-calculating element, so that described path-calculating element carrys out calculating path with the parameter value after the renewal of storing in described data storage cell.
5. information-communication device according to claim 4, is characterized in that,
Described control unit, in the situation that the path that described path-calculating element calculates can not be utilized, upgrades the parameter value of the current time of storing in described data storage cell.
6. information-communication device according to claim 4, is characterized in that,
In the situation that described path-calculating element used described parameter likely do not obtain yet the path that needs after value, described control unit is judged as and does not find path.
7. according to the information-communication device described in claim 1-6, it is characterized in that,
Described path-calculating element is the public path computation service devices of a plurality of described information-communication devices.
8. according to the information-communication device described in any one in claim 1-6, it is characterized in that,
Described information-communication device is router.
9. a communication means for information-communication device, this information-communication device is controlled optical-fiber network, and this optical-fiber network is by a plurality of optical cross-connection equipments are connected to the optical-fiber network forming with optical fiber, and this communication means is characterised in that,
When the control unit having in described information-communication device is judged path that the path-calculating element that has in described information-communication device calculates and can not be utilized, control the parameter value that the data storage cell having in described information-communication device upgrades the current time of the parameter of storing in this data storage cell, and control described path-calculating element and use the above-mentioned parameter value after upgrading to recalculate path, thereby find the light path that can utilize
Comprise the following steps:
Storage represents the topological diagram of network topological information;
A plurality of parameters of adjusting for the waveform transformation portion that converts output to inputting light that can have in described optical cross-connection equipment, the scope that each parameter value of storage current time and this parameter can be adjusted;
Can the light path that calculate downstream be utilized by described optical cross-connection equipment at current time; And
By adjusting the parameter of appointment in described a plurality of parameter, thereby described light path can be utilized;
Wherein, described a plurality of parameter comprises respectively the situation that can node, input port, output port, Optical Equalizer type, link parameter and node use.
10. communication means according to claim 9, is characterized in that,
Described path-calculating element is the public path computation service devices of a plurality of described information-communication devices.
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