CN101998187A - Information communication device and information communication method - Google Patents

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

Information-communication device and information communicating method

Technical field

The present invention relates to optical communication network, especially, relate to and use the variable physical constraint to carry out the information-communication device and the information communicating method of route in the optical communication network.

Background technology

At present be that the traditional electrical phone network at center carrying out the transition to the data service be the telecommunications network at center with the voice service.This development trend requires following transmission net must carry out Route Selection and dynamic bandwidth allocation effectively, guaranteeing to transmit different business, and promptly recovers when network or link failure.

In order to adapt to this demand, will carry out the transition to ASON from synchronous digital hierarchy (SDH) as the Fibre Optical Communication Technology that transmits the net core, 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 the domestic ASON.The main feature of ASON is client's network element of supporting to have different business kind class feature, and can be according to the demand of service distribution pattern dynamic change in the network, by signaling system or autonomous foundation of management plane or dismounting optical channel.

The ASON network architecture comprises transmission plane, control plane and management plane.It transmits the plane and uses wavelength division multiplexing (WDM) terminal equipment, Optical Add Drop Multiplexer (OADM) equipment and optical cross connect (OXC) equipment usually.Wherein light interleaving techniques exchange velocity is fast, granularity is big, low in energy consumption, crosstalk little, have a 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 bandwidth easily, cut operating costs.

The control plane of ASON network can use the general multiple protocols label exchange (GMPLS) that is 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 set up or remove optical channel, use the routing algorithm of Constraint Shortest Path First algorithm (CSPF) for example to obtain the path of optical channel, and the signaling procedure of setting up or removing with GMPLS message execution route.

The CSPF algorithm has increased constraints on the basis of shortest-path first algorithm (SPF), to guarantee that result of calculation can satisfy certain constraint requirements.Traditional constraints comprises bandwidth, time delay and shake etc.In US patent 7,324,453 (in January, 2008) " Constraint-based shortestpath first method for dynamically switched optical transportnetworks ", the CSPF algorithm has been done introduction.Consider and transmit the trend of plane to all optical network development, the physical characteristic of optical channel also becomes the constraints that the CSPF algorithm need be considered.The physical damnification that has used the optical channel of Optical Signal To Noise Ratio (OSNR) and polarization mode disperse (PMD) for example in OFC2008 meeting paper " Optical Path Computation Element interworking with NetworkManagement System for Transparent Mesh Networks " is as the constraint in the CSPF algorithm.The wavelength continuity also can be used as the constraint in the 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 among the figure is made of 6 LSRs (LSR) 10, between the LSR 10 by connecting into ring topology by optical fiber link 20.Each LSR 10 is included in the router one 01 that the IP layer carries out IP bag route and realizes optical-fiber network key-course function, and have an Optical Equalizer (OE) 1021 carry out the optical cross connect (OXC) 102 of light exchange in physical layer.Optical Equalizer 1021 wherein is used 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, be-1360ps/nm as the desirable dispersion measure of the dispersion compensator of Optical Equalizer 1021.Yet because the actual distance of laying of the compensator accuracy of manufacture, link comes in and goes out, and the reasons such as link dispersion variation brought of variation of ambient temperature, always exist certain residual dispersion in the real network, and along with the time slowly changes.Along with the raising of network development and transmission rate, such residual dispersion to systematic function cause to influence 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 because the transmit power variation that the link active loss is come in and gone out, the transmitter variations in temperature causes, and the reasons such as change in gain brought of channel number increase and decrease, always exist certain through-put power to change in the real network, and systematic function is impacted.

Summary of the invention

Therefore, from more long-range technical development, can adopt dynamic Optical Equalizer (OE) to improve the channel physical damnification in following optical-fiber network, for example adopt the Tunable Dispersion Compensator spare of fiber grating that residual dispersion is carried out fine compensation, perhaps utilize the wavelength shifter of semiconductor optical amplifier to carry out wavelength conversion to satisfy path wavelength continuity requirement.Yet in present CSPF algorithm, all parameter values as link that retrains in the algorithm and Optical Equalizer are fixed value, can not show the tuning range of above dynamic Optical Equalizer, therefore can't when selecting the path, utilize dynamic Optical Equalizer the physically impaired improvement of channel.

The objective of the invention is to solve above-mentioned technical task, a kind of information-communication device that can utilize dynamic Optical Equalizer that the physical damnification of channel is improved 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 the optical-fiber network that constitutes with optical fiber, this information-communication device is characterised in that: by controlling the waveform transformation portion that has in the above-mentioned optical cross-connection equipment, input light is carried out conversion output, thereby can be utilized the light path in downstream by the optical cross-connection equipment with above-mentioned waveform transformation portion.

Described information-communication device has: topological diagram memory cell, the topological diagram of storage representation network topological information; Data storage cell, for can by have in the described optical cross-connection equipment, input light is carried out a plurality of parameters that the waveform transformation portion of conversion output adjusts, 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 the downstream by described optical cross-connection equipment utilization at current time; And control unit, by adjusting designated parameters in described a plurality of parameter, thereby described light path can be utilized.

A plurality of parameters of described data storage cell storage comprise the situation that can node, input port, output port, Optical Equalizer type, link parameter and node use respectively.

Described link parameter comprises minimum value, maximum, interval and currency.

Described path-calculating element uses the described parameter of storing in the described topological diagram stored in the described topological diagram memory cell and the described data storage cell to ask for the path.

Described control unit is controlled described path-calculating element, so that described path-calculating element uses the parameter value after the renewal of storing in the described data storage cell to come calculating path.

Under the situation that described control unit can not be utilized in the path that described path-calculating element calculates, upgrade the parameter value of the current time of storing in the described data storage cell.

Described path-calculating element used described parameter do not obtain yet after might value under the situation in the path that needs, described control unit is judged as and does not find the 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 a 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 the optical-fiber network that constitutes with optical fiber, this communication means is characterised in that, when the control unit that has in the described information-communication device is judged path that the path-calculating element that has in the described information-communication device calculates and can not be utilized, control the parameter value that the data storage cell that has in the described information-communication device upgrades the current time of stored parameters in this data storage cell, and control described path-calculating element and use the above-mentioned parameter value after upgrading to recomputate the path.

Described path-calculating element is the public path computation service devices of a plurality of described information-communication devices.

Adopt the information-communication device of the present invention and the information communicating method of said structure can carry out Route Selection and dynamic bandwidth allocation effectively, guaranteeing to transmit different business, and when network or link failure, promptly recover.

Description of drawings

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 the matrix according to 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 passes through tag distribution protocol (LDP) signaling control Optical Equalizer parameter according to embodiment 1;

Fig. 8 is setting of optical cross connect parameter and the optical cross connect parameter update message structure according to 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 passes through tag distribution protocol (LDP) signaling control Optical Equalizer parameter according to embodiment 2.

Embodiment

Fig. 1-8 has 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 finished 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 the network all has such control plane and path computation function, can become the ingress edge router.

Embodiments of the invention 1 based on the optical network structure of optical cross connect (OXC) also with reference to shown in Figure 1.6 LSRs of optical-fiber network among the figure (LSR) 10 constitute, between the LSR 10 by connecting into ring topology by optical fiber link 20.Each LSR 10 is included in the router one 01 that the IP layer carries out IP bag route and realizes optical-fiber network key-course function, and have an Optical Equalizer (OE) 1021 carry out the optical cross connect (OXC) 102 of light exchange in physical layer.But, unlike the prior art be that Optical Equalizer 1021 wherein is dynamic-tunings, is used for compensated optical signal through the suffered signal impairment of optical fiber link 20.Optical Equalizer 1021 can be the Tunable Dispersion Compensator spare that adopts fiber grating, utilize the wavelength shifter of semiconductor optical amplifier and utilize full light regenerator of high non-linear photon crystal optical fiber or the like.Data in the network are light signal in physical layer, mainly carry out coarsegrain (for example wavelength) exchange with the form of light signal by optical cross connect 102.Partly need the data of small grain size (for example virtual circuit) exchange in optical cross connect 102, to exchange, wherein need the further data of handling upwards to be transferred to router one 01 and carry out IP layers processing such as route, queuing, shaping by the circuit between router one 01 and the optical cross connect 102 through the form with the signal of telecommunication after the opto-electronic conversion.The control plane function of LSR 10 realizes in router one 01, so the behavior of optical cross connect 102 is by router one 01 control.

Fig. 2 is according to the LSR of embodiment 1 (LSR) structured flowchart.LSR is included in the router one 01 that the IP layer carries out IP bag route and realizes optical-fiber network key-course function, and the optical cross connect 102 of carrying out the 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 with shown in Figure 3.

Router one 01 further comprises the topological diagram memory 1011 of storage networking topology information, carry out the path-calculating element 1012 that path computing obtains label switched path according to network topology and OE parameter, Open Shortest Path First for the acquiring and maintaining network topological information (OSPF) protocol module 1013, carry out tag distribution protocol (LDP) protocol module 1014 of 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 the 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 send to optical cross connect 102 and transmit after process TCP/IP 1016 encapsulation and route, and upload to the corresponding module of neighbor router when arriving neighbor router from optical cross connect.OSPF 1013 sets up and safeguards topological diagram in the topological diagram memory 1011 by neighbours' discovery feature and broadcast topology function, make each router one 01 all keep the topological diagram of a universe unanimity.LDP 1014 uses OE parameter broadcast capabilitys to set up and safeguard OE parameter list in the OE parameter list reservoir 1015, similarly, makes each router one 01 all keep the OE parameter list of a universe unanimity.When network topology or OE parameter changed, this change propagation time on the all-router in the territory was called as convergence time.

After finishing topological diagram memory 1011 and OE parameter list reservoir 1015 initialization procedures, path-calculating element 1012 can be set up demand according to the path that the load flow that arrives produces and come calculating path, and uses topological diagram in the topological diagram memory 1011 and the OE parameter list (referring to the flow chart among Fig. 4) in the OE parameter table stores device 1015 in computational process.The result of calculation of path-calculating element 1012 is to comprise that each that constitute the path jumps the routing information of the set of LSR, may comprise the Optical Equalizer tuning information of the set of Optical Equalizer that needs are tuning and target values for tuning thereof in addition in addition.Path-calculating element 1012 directly sends to LDP 1014 to routing information, carries out the path by LDP 1014 transmission label request messages (referring to the message format of Fig. 8) and sets up signaling procedure (referring to the sequential chart among Fig. 7).Simultaneously, path-calculating element 1012 is updated to the Optical Equalizer tuning information in the OE parameter list reservoir 1015, tuning if desired Optical Equalizer is the Optical Equalizer in the optical cross connect of this node, then undertaken tuning by OXC control 1017 control optical cross connects 102, tuning if desired Optical Equalizer is the Optical Equalizer in other node optical interconnection, then 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 among Fig. 7).If LDP 1014 receives the OXC parameter from other node message is set, then according to the OE parameter list in the OE parameter list reservoir 1015 in this node of information updating, and undertaken tuning by the 1017 control optical cross connects 102 of OXC control module according to the message of receiving.In addition, LDP 1014 is responsible for the variation of the OE parameter list in the OE parameter list reservoir 1015 is broadcasted to neighbor node by OXC parameter update message, to keep the universe unanimity.

Fig. 3 is the light cross connecting structure block diagram with Optical Equalizer (OE) according to embodiment 1.Optical cross connect 102 has hierarchy, comprises optical fiber level, wavestrip level, wavelength level and circuit stages switching part successively according to the exchange granule size.Be connected to 102 1 groups of optical fiber links of optical cross connect and at first carry out the exchange of optical fiber level, carry out equilibrium treatment simultaneously by all light signals in 1023 pairs of optical fiber of OE1 simultaneously in optical fiber interconnection (FXC) 1022.Need the data-signal of littler exchange granularity to be switched on the multiplexing demultiplexing device 1025 and 1026 that is connected with wavestrip interconnection (BXC) 1024, and in wavestrip interconnection 1024, carry out the exchange of wavestrip level, carry out equilibrium treatment simultaneously by all light signals in 1027 pairs of wavestrips of OE2 simultaneously.Need the data-signal of littler exchange granularity to be switched on the multiplexing demultiplexing device 1029 and 1030 that is connected with wavelength interconnection (WXC) 1028, and in wavelength interconnection 1028, carry out the exchange of wavelength level, carry out equilibrium treatment by all light signals in 1031 pairs of wavelength of OE3 simultaneously.At last, the data-signal that needs littler exchange granularity or need the IP layer to handle be switched to electric interconnection (EXC) 1032 on, and carrying out the circuit stages exchange after in electric interconnection 1032, converting the signal of telecommunication to, the data-signal that wherein needs the IP floor to handle sends to router one 01 by last/following road device (A/D) 1033.Otherwise the data-signal that comes from the IP floor enters into data-transmission channel by last/following road device 1033, passes through electric interconnection 1032, wavelength interconnection 1028, wavestrip interconnection 1024 and optical fiber interconnection 1022 successively, sends on the outlet optical fiber.

Optical Equalizer OE1 1023 among Fig. 3, OE2 1027 need handle a plurality of wavelength simultaneously, therefore can be multichannel Tunable Dispersion Compensator spare or fiber amplifier, and OE3 1031 is single wavelength devices, can be single channel Tunable Dispersion Compensator spare, 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 subjected to OXC control signal 104 controls from the OXC control module 1017 of router one 01.It should be noted that, shown in Figure 3 is an optical cross connect that comprises complete exchange level, in actual applications, optical cross connect usually includes only part exchange level according to different demands, for example only comprises wavelength level and circuit stages exchange (module 1029-1033).In addition, light signal can be that one-way communication also can be two-way communication in optical fiber link and optical cross connect.

Fig. 4 is the path computing flow chart according to embodiment 1.After finishing topological diagram memory 1011 and OE parameter list reservoir 1015 initialization procedures, path-calculating element 1012 can be set up demand according to the path that the load flow that arrives produces and come calculating path.At first program obtains the copy by the topological diagram in the topological diagram memory 1011 of OSPF 1013 foundation in step 401, calculates shortest path according to current topological diagram and obtains path 1 (step 402), and the algorithm that wherein calculates usefulness can be a dijkstra's algorithm.Whether the path 1 of programmed decision step 402 result of calculation is empty (step 403) then, if result of determination shows and can't set up desired path that then program will find the sign in path to be made as quit a program after the vacation (step 404) (step 415) for being.If instead result of determination is for denying, then 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.), just the path that does not meet constraint in the topology is cut off according to constraints, then the topological diagram after pruning is recomputated shortest path with dijkstra's algorithm, obtain path 2 (step 406).Whether the path 2 of programmed decision step 406 result of calculation is empty (step 407) then, if result of determination is for denying, show and find desired path and do not need any Optical Equalizer is carried out tuning that then program will find the sign in path to be made as very quit a program after (step 408) (step 415).

If instead the result of determination of step 407 shows that for being constraint requirements is not satisfied in path (path 1) of some satisfied topology requirement, in step 405, pruned away.Next need to consider that the tuned light equalizer attempts to make these paths that pruned away to become and can satisfy constraints, so program enters step 409, select suitable Optical Equalizer type in the network according to constraint, for example, if constraint is maximum residual dispersion, then select Tunable Dispersion Compensator spare, if constraint is the wavelength continuity, then select wavelength shifter,, then select full light regenerator if constraint is an Optical Signal To Noise Ratio.Usually, in once calculating, only consider a kind of main constraints.If a plurality of constraintss are arranged, then need each constraint is carried out a deuterzooid algorithm and got all results' common factor.After having selected the Optical Equalizer type, program reads the OE parameter list (step 410) in the OE parameter list reservoir 1015, and check on all included nodes of the path in step 402, obtain 1 whether available Optical Equalizer (step 411 is referring to the OE parameter list among Fig. 6) is arranged.If check result, shows that all Optical Equalizers on all included nodes of path 1 are all unavailable for not, then can't make path 1 satisfy constraint, so program will find the sign in path to be made as quit a program after the vacation (step 404) (step 415).

If instead the check result of step 411 is for being, show that the Optical Equalizer that might regulate on included certain or some node in path 1 makes path 1 satisfy constraint, therefore program enters step 412, tuning step-length according to each Optical Equalizer progressively increases and decreases/reduces, just change the physical damnification value on the path 1, for example residual dispersion or Optical Signal To Noise Ratio, and the constraint of calculating path 1 again.Whether programmed decision satisfies constraint (step 413) in the path 1 of Optical Equalizer being carried out after tuning then, if result of determination is for being, show that the path 1 that Optical Equalizer is carried out after tuning can satisfy constraint, then program will find the sign in path to be made as very quit a program after (step 408) (step 415).If instead result of determination is for denying, show the still satisfied constraint in path 1, then whether programmed decision had attempted the possible parameter value (step 414) of the institute of all available light equalizers on the path 1, if result of determination is for denying, returning step 412 continues the Optical Equalizer parameter value is increased and decreased/reduces, up to finding the Optical Equalizer parameter value (step 413 is judged to be and is) that makes path 1 satisfy constraint, perhaps up to the result of determination of step 414 for being to show and can not make path 1 satisfy constraint by the tuned light equalizer.

Progressively the institute of all available light equalizers might parameter value on the scanning pattern 1 in the circulation that constitutes by step 412-414, might make path 1 satisfy the Optical Equalizer parameter value of constraint thereby find, and the path 1 of the satisfied constraint that under this parameter value, becomes.Path-calculating element 1012 is the former the Optical Equalizer tuning information as the set of Optical Equalizer target values for tuning, and the latter as comprising that each that constitute the path jumps the routing information of the set of LSR and output to LDP1014 and OE parameter list reservoir 1015.If program withdrawed from before step 412, be to withdraw under the situation that is perhaps in step 414 result of determination, then Shu Chu Optical Equalizer tuning information is empty, showing does not need tuning Optical Equalizer.If program is made as fictitious time in the sign that finds the path and withdraws from, be to withdraw under the situation that is perhaps in step 414 result of determination, the routing information of output is empty, shows the path that does not meet the demands.

With the network among Fig. 1 is example, supposes that LSR1 need initiate to set up one successively through arriving the path of LSR4 behind LSR2 and the 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 the link residual dispersion, value is followed successively by 100 ps/nm, 200 ps/nm, 100ps/nm, 150 ps/nm, 250 ps/nm, 200ps/nm.Then 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 400 ps/nm, and the limits value in path 2 is 600 ps/nm.Must be if the path of network settings is restricted to the absolute value of path link residual dispersion less than 800 ps/nm, then two paths all satisfy restriction, and the CSPF algorithm will select one to export as result of calculation from path 1 and path 2 at random.If the restriction of the path of network settings is further strict, the absolute value that becomes the path link residual dispersion must then have only path 1 to satisfy restriction less than 500 ps/nm, and the CSPF algorithm is exported path 1 as result of calculation.If the restriction of the path of network settings is further strict, become for the absolute value of path link residual dispersion must be less than 300ps/nm, then restriction is not all satisfied in path 1 and path 2, because the link residual dispersion in the legacy network is a fixed value, can not regulate, so traditional CSPF algorithm output dead circuit footpath does not just have reachable path, so this calling gets clogged.And in the present invention path-calculating element 1012 will be inquired about OE parameter list (referring to the OE parameter list among Fig. 6) in this case, discovery has the Optical Equalizer of available dispersion compensator type in node 3, its chromatic dispersion tuning range is-800ps/nm is to-400ps/nm, tuning step-length is 5 ps/nm, and the parameter current value is-400ps/nm.The calculating of the circulation that constitutes through step 412-414 in the program, find when the value of this Optical Equalizer during for-400ps/nm the restriction value in path 1 be 0, can satisfy the path of network and limit.So algorithm with path 1 as routing information output, and with the Optical Equalizer value of node 3 is-400ps/nm exports as the Optical Equalizer tuning information.

Adopt above-mentioned algorithm, can make network can utilize the characteristic of dynamic Optical Equalizer that the channel physical damnification is improved, thereby make the path that originally can't satisfy physically impaired constraint can satisfying constraint through becoming after the Optical Equalizer, increase the route flexibility of network, reduce and set up the blocking rate in path, and increase network utilization.

Fig. 5 is the matrix according to the expression network topology of embodiment 1.Each element of matrix is an array, is illustrated in two links between the node.Vi for example, j represents the link between node i and the node j, Vi wherein, the weight of first this link of element representation of j, when not having the link that directly links to each other between node i and the node j, this weighted value be an 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 time-delay and residual dispersion, Vi, second element and the 3rd element of j can be the time-delay of this section link and the value of residual dispersion successively.The method of calculating the constraint on certain paths is all matrix elements of link correspondence that this paths is comprised corresponding restriction value additions of this constraint that neutralize.

Fig. 6 is the Optical Equalizer parameter list according to embodiment 1.Whether available the row of form from left to right represent to be connected in the node, optical cross connect at Optical Equalizer place the input port, output port, the type of Optical Equalizer, the link parameter of Optical Equalizer of Optical Equalizer successively, and Optical Equalizer sign.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 (at interval) of Optical Equalizer parameter value scope, and the parameter current value.For example first line display has the Optical Equalizer of 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 chromatic dispersion tuning range is-800ps/nm is to-400ps/nm, tuning step-length is 5 ps/nm, and the parameter current value is-400ps/nm.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 chromatic dispersion tuning range is-600ps/nm is to-200ps/nm, tuning step-length is 5 ps/nm, and the parameter current value is-350ps/nm.The third line is illustrated in the Optical Equalizer that available wavelength shifter type is arranged in the 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 the parameter current value is 1529.94nm.Fourth line is illustrated in the Optical Equalizer that available regenerator type is arranged in the node 3, its input port is the port one 0 of optical cross connect, and output port is the port 20 of optical cross connect, and its output Optical Signal To Noise Ratio tuning range is 10 to 20, tuning step-length is 0.1, and the parameter current value is 10.

Fig. 7 is the sequential chart that passes through tag distribution protocol (LDP) signaling control Optical Equalizer parameter according to embodiment 1.Hypothesis LSR1 need initiate to set up one successively through arriving the path of LSR4 behind LSR2 and the LSR3 among the figure, and needs to regulate the Optical Equalizer parameter value among the LSR3.When system initialization, send hello message 701-703 between the LSR1-4 mutually, make LSR1-4 simultaneously by finding that neighbours' (step 704) set up network topology.After initialization is finished, LSR1 receives the new data stream (step 705) from client's subnet on the port that for example is connected to client's subnet, thereby carry out the path computing (step 706) of flow chart description among Fig. 4, Optical Equalizer tuning information among the result who obtains shows the Optical Equalizer parameter value among the needs adjusting LSR3, and routing information shows that available path is for beginning from LSR1 successively through arriving LSR4 behind LSR2 and the LSR3.Therefore LSR1 at first is provided with message 707 with the form of IP bag to LSR3 transmission OXC parameter.After LSR3 receives that the OXC parameter is provided with message, the Optical Equalizer parameter value (step 708) of this node is set and upgrades the OE parameter list (step 709) of this node according to the Optical Equalizer target values for tuning that comprises in the message.LSR3 notifies other node oneself to regulate Optical Equalizer by broadcasting OXC parameter update message 7 10 and this Optical Equalizer is occupied then.Then LSR1, LSR2 and LSR4 upgrade the OE parameter list (step 711) of this node after receiving message.

LSR1 sends label request message 712 along the node that routing information comprises to LSR4 with the form of IP bag then.LSR2, LSR3 and LSR4 are provided be connected (the step 713-715) of separately OXC respectively after receiving label request message 720.LSR4 receives that label request message 720 back one jumps LSR3 and send this label on it for label of this path allocation and in label mapping message 716, and LSR3, LSR2 also one jump distributing labels and send label mapping message 717,718 on separately after receiving from the label mapping message of its next jumping respectively.Last LSR1 receives the foundation of finishing the path after the LSR2 distributed labels, and LSR1 transmits to the path of setting up after beginning a data flow 7 19 of receiving stamped this label.Note each node give last one jump distributed labels 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 is setting of optical cross connect parameter and the optical cross connect parameter update message structure according to embodiment 1.Message comprises the version number of 2 bytes, data protocol unit (PDU) length of 2 bytes, the LDP ID of 6 bytes, the unknown message position of 1 bit, the type of message of 7 bits, the message-length of 1 byte, the message id of 4 bytes, and the message parameter of 4 bytes.Wherein type of message is used to distinguish 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 shines upon, the label request, regain that label request, label are cancelled, label discharges, the setting of OXC parameter, OXC parameter update.Wherein setting of OXC parameter or OXC parameter update message can be inserted the Optical Equalizer parameter value that need to upgrade or upgraded and Optical Equalizer node corresponding number and port numbers in message parameter.

Fig. 9-10 has illustrated system configuration and the message time sequence of embodiment 2.Because 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 finished by path-calculating element (PCE) server, the path-calculating element server is notified corresponding ingress edge router result of calculation, is carried out the signaling procedure of path foundation/dismounting again by each hop router on the 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 among the figure (LSR) 30 constitute, between the LSR 10 by connecting into ring topology by optical fiber link 20, be connected by link 40 between LSR 10 and the path-calculating element server 30 in addition, wherein link 40 can be that physical link also can be the virtual connections in the optical fiber link 20.Each LSR 10 is included in the router one 01 that the IP layer carries out IP bag route and realizes optical-fiber network key-course function, and have an Optical Equalizer (OE) 1021 carry out the optical cross connect (OXC) 102 of light exchange in physical layer.Optical Equalizer 1021 wherein is dynamic-tunings, is used for compensated optical signal through the suffered signal impairment of optical fiber link 20.Optical Equalizer 1021 can be Tunable Dispersion Compensator spare, wavelength shifter and full light regenerator or the like.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 controlled jointly by router one 01 and path-calculating element server 30, just, 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 passes through tag distribution protocol (LDP) signaling control Optical Equalizer parameter according to embodiment 2.Hypothesis LSR1 need initiate to set up one successively through arriving the path of LSR4 behind LSR2 and the LSR3 among the figure, and needs to regulate the Optical Equalizer parameter value among the LSR3.When system initialization, LSR1-4 sends hello message 901-904 to the path-calculating element server, makes the path-calculating element server obtain information and sets up network topology (step 905).After initialization is finished, LSR1 receives the new data stream (step 906) from client's subnet on the port that for example is 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 among the result who obtains shows the Optical Equalizer parameter value among the needs adjusting LSR3, and routing information shows that available path is for beginning from LSR1 successively through arriving LSR4 behind LSR2 and the LSR3.Therefore the path-calculating element server at first is provided with message 909 with the form of IP bag to LSR3 transmission OXC parameter.After LSR3 receives that the OXC parameter is provided with message, the Optical Equalizer parameter value (step 910) of this node is set and sends to the path-calculating element server that OXC parameter update message 911 notification path computing unit servers oneself have been regulated Optical Equalizer and this Optical Equalizer is occupied according to the Optical Equalizer target values for tuning that comprises in the message.The path-calculating element server is received parameter update message 911 back renewal OE parameter lists (step 912).

The routing information that can use to LSR1 path computation answer message 913 notice LSR1 of path-calculating element server and can begin the signaling procedure that the path is set up then.LSR1 sends label request message 914 along the node that routing information comprises to LSR4 with the form of IP bag.LSR2, LSR3 and LSR4 are provided be connected (the step 915-917) of separately OXC respectively after receiving label request message 914.LSR4 receives that label request message 914 back one jumps LSR3 and send this label on it for label of this path allocation and in label mapping message 918, and LSR3, LSR2 also one jump distributing labels and send label mapping message 919,920 on separately after receiving from the label mapping message of its next jumping respectively.Last LSR1 receives the foundation of finishing the path after the LSR2 distributed labels, and LSR1 transmits to the path of setting up after beginning a data flow 921 of receiving stamped this label.Note each node give last one jump distributed labels 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 (12)

1. an information-communication device is controlled optical-fiber network, and this optical-fiber network is the optical-fiber network that constitutes with the optical fiber connection by with a plurality of optical cross-connection equipments, and this information-communication device is characterised in that:

By controlling the waveform transformation portion that has in the described optical cross-connection equipment, input light is carried out conversion output, thereby can utilize the light path in downstream by optical cross-connection equipment with described waveform transformation portion.

2. information-communication device according to claim 1 is characterized in that,

Have:

The topological diagram memory cell, the topological diagram of storage representation network topological information;

Data storage cell, for can by have in the described optical cross-connection equipment, input light is carried out a plurality of parameters that the waveform transformation portion of conversion output adjusts, 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 the downstream by described optical cross-connection equipment utilization at current time; And

Control unit by adjusting designated parameters in described a plurality of parameter, thereby can utilize described light path.

3. information-communication device according to claim 2 is characterized in that,

A plurality of parameters of described data storage cell storage comprise the situation that can node, input port, output port, Optical Equalizer type, link parameter and node use respectively.

4. information-communication device according to claim 3 is characterized in that,

Described link parameter comprises minimum value, maximum, interval and currency.

5. information-communication device according to claim 2 is characterized in that,

Described path-calculating element uses the described parameter of storing in the described topological diagram stored in the described topological diagram memory cell and the described data storage cell to ask for the path.

6. information-communication device according to claim 2 is characterized in that,

Described control unit is controlled described path-calculating element, so that described path-calculating element uses the parameter value after the renewal of storing in the described data storage cell to come calculating path.

7. information-communication device according to claim 6 is characterized in that,

Under the situation that described control unit can not be utilized in the path that described path-calculating element calculates, upgrade the parameter value of the current time of storing in the described data storage cell.

8. information-communication device according to claim 6 is characterized in that,

Described path-calculating element used described parameter do not obtain yet after might value under the situation in the path that needs, described control unit is judged as and does not find the path.

9. according to the described information-communication device of claim 1-8, it is characterized in that,

Described path-calculating element is the public path computation service devices of a plurality of described information-communication devices.

10. according to any described information-communication device among the claim 1-8, it is characterized in that,

Described information-communication device is a router.

11. the communication means of an 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 the optical-fiber network constitute with optical fiber, and this communication means is characterised in that,

When the control unit that has in the described information-communication device is judged path that the path-calculating element that has in the described information-communication device calculates and can not be utilized, control the parameter value that the data storage cell that has in the described information-communication device upgrades the current time of stored parameters in this data storage cell, and control described path-calculating element and use the above-mentioned parameter value after upgrading to recomputate the path, thereby find the light path that can utilize.

12. communication means according to claim 11 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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