CN1571393A - Node structure supporting variable-length packet in metropolitan area ring network - Google Patents
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- CN1571393A CN1571393A CNA2004100183032A CN200410018303A CN1571393A CN 1571393 A CN1571393 A CN 1571393A CN A2004100183032 A CNA2004100183032 A CN A2004100183032A CN 200410018303 A CN200410018303 A CN 200410018303A CN 1571393 A CN1571393 A CN 1571393A
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Abstract
一种城域环网中支持可变长分组的节点结构，由解复用器，包含W个分光器的分光器模块，光电检测模块，控制处理模块，包含W个光纤延迟线的光纤延迟线模块，包含一个2×2交换及(W－1)个1×2交换的交换模块，发射波长为λi的发射器，波长下路模块和复用器组成。控制处理模块采用分时隙的帧结构，在每个时隙的开始，根据获得的环路各波长信号的检测结果，结合其历史记录，决定交换模块在当前时隙的连接状态，完成分组的接收和发送过程。本发明节点以固定波长上路业务，可同时接收多个波长携带的分组，分组收发不需要专用控制信道，提高了资源利用率，能同时支持源节点和目的节点剥离业务，支持组播和广播，以及可变长分组的传送。
A node structure supporting variable-length packets in a metropolitan ring network, comprising a demultiplexer, an optical splitter module comprising W optical splitters, a photoelectric detection module, a control processing module, and an optical fiber delay line comprising W optical fiber delay lines The module includes a 2×2 switch and (W-1) 1×2 switch switch modules, a transmitter with a transmission wavelength of λ i , a wavelength drop module and a multiplexer. The control processing module adopts the frame structure divided into time slots. At the beginning of each time slot, according to the obtained detection results of each wavelength signal of the loop, combined with its historical records, it determines the connection status of the switching module in the current time slot, and completes the grouping. receiving and sending process. The node of the present invention uses a fixed wavelength to add services, and can receive packets carried by multiple wavelengths at the same time. The sending and receiving of packets does not require a dedicated control channel, which improves resource utilization, and can simultaneously support the stripping of services from source nodes and destination nodes, and support multicast and broadcast. and transmission of variable-length packets.
Description
Technical field
The present invention relates to support in a kind of metropolitan area looped network the node structure of variable length grouping, support single channel and multi channel metropolitan area ring network, be applicable to that business burst is strong, the metropolitan area optical fiber ring network node device that block length is variable.Belong to the optical communication net technical field.
Background technology
Because wavelength division multiplexing (Wavelength division multiplexing, WDM) progress of technology and various access technologies, solved at present the transmission problem of backbone network and access network preferably, but for (the Metro area networks of the MAN between backbone network and access network, MAN), since its loaded service flow may be more than backbone network big, and business interface complexity has become the bottleneck of restriction network fast development.Compare with backbone network with Access Network, metropolitan area network has the unique features of himself, that is: (1) overlay area is limited, is generally 50～200km; (2) the network node number change is bigger, is generally 10～200 nodes; (3) it is less (to compare) number of users with backbone network, business burst degree height; (4) class of business is many, complex interfaces, and being difficult to use accurately, Mathematical Modeling defines the business in the metropolitan area network.Therefore, must study new network architecture and access protocol, to satisfy of the requirement of next-generation metro network network to aspects such as economy, flexibility and upgradabilities.
Based on single-channel metro ring planar network architecture, the networking new technology that industry is relatively paid close attention at present is when belonging to resilient packet ring technology (IEEE 802.17 RPR, Resilient packet ring).RPR is a bidirectional optical fiber looped network, and wavelength of each direction all will carry out electric treatment (buffer insertion ring) at each node.RPR has used based on destination node and has peeled off professional space reuse and improved shortest path by technology, in conjunction with its complicated fairness algorithm, has improved the overall performance of loop network significantly.Simultaneously, RPR can realize the protection of 50ms level.It is very big that these factors make that RPR becomes the possibility of the most important technology of metropolitan area network.But, improve the overall performance of MAN, should adopt WDM technology, rather than adopt single wavelength channel, should avoid carrying out photoelectricity light (OEO) in addition as far as possible and handle, to save a large amount of buffers and to reduce the intermediate node handles time delay at each node.
For multi channel metro ring planar network architecture, people have also proposed diverse network and nodal analysis method, and have set up some experimental systems.Difference configuration according to the node transceiver, these nodal analysis methods can be divided into fixing transmission (Fixed Transmitting, FT), tunable transmission (Tunable Transmitting, TT), Gu Ding reception (Fixed Receiving, FR) and tunable reception (Tunable Receiving TR) waits the combination of four kinds of situations.Different combinations has different separately characteristics.
For the FT-FR structure, node does not have tuning part, and cost is relatively low, realizes simple relatively.But owing to be fixing road wavelength signals up and down, the scalable performance of network is poor, and is dumb, and resource utilization is low.If will guarantee network traffics and delay performance, must be equipped with a large amount of transmitter or receiver, cost may not be cheap, waste also very seriously, and in addition, if the design of medium access protocol is unreasonable, performance also can ideal.RINGO metropolitan area looped network can be described as this structure representative (R.Gaudino, et al.RINGO:A WDM ring opticalpacket network demonstrator.Proc., ECOC, vol.4, pp.620-621, Oct.2001).
For the FT-TR structure, it is more flexible than FT-FR structure, can obtain to be better than flow performance, access delay performance and the scalable performance of FT-FR structure in theory, can finely be applied to the circuit-switched service environment.But its cost is more expensive than FT-FR structure.In the present experimental system, as KomNet metropolitan area looped network (D.Stoll, et al.Metropolitan DWDM:A dynamically configurable ring for the KomNetfield trial in Berlin.IEEE Communications Magazine, vol.39, no.2, pp.106-113, Feb.2001), all adopted adjustable grating, its tuning period is bigger, reach a millisecond magnitude, therefore not too effective for the prevailing packet switching service of present data service.In addition, also there is the reception collision problem in this structure, has influenced the overall performance of network.
For the TT-FR structure, its network performance is very similar with characteristics and FT-TR structure, for example, HORNET metropolitan area looped network (Ian M.White, et al. " A summary of the HORNET project:Anext-generation metropolitan area network.IEEE Journal on Selected Areasin Communications; vol.21; no.9; pp.1478-1494; Nov.2003) with MAWSON metropolitan area looped network (M.A.Summerfield.MAWSON:A metropolitan area wavelength switchedoptical network.APCC ' 97; Sydney, Australia, pp.327-331 Nov.1997) has all adopted grating, circulator and tunable reflector also are not suitable for the prevailing packet switching service of data service.
The network traffics of TT-TR structure, delay performance is although scalable performance and flexibility are best in four kinds of structures.But the cost costliness, the problem that exists in two kinds of structures of TT-TR and FT-TR exists simultaneously, and therefore this structural research is less.
More than these single channel MAN node technologies based on Resilient Packet Ring can not make full use of the wavelength division multiplexing ability, all to carry out the photoelectricity optical processing at each node, and it is dumb based on the fixing structure that receives of multi channel fixedly transmission, resource utilization is low, fixed transmission tunable reception or the fixing reception of tunable transmission structure are too high to the tuning delay requirement of tunable devices, have the problem of aspects such as transmission or reception conflict.
Summary of the invention
The objective of the invention is at the existing deficiency of present node structure, propose to support the node structure that variable length divides into groups in a kind of new metropolitan area looped network, can adopt the optical device of present commercialization, implementation method is simple, can support source node and destination node to peel off business simultaneously, supports multicast and broadcasting, and the transmission of variable length grouping, the control procedure of grouping transmitting-receiving is simple, does not need the wavelength dedicated channel, has improved resource utilization.
For realizing this purpose, the node structure of the present invention's design is by a demodulation multiplexer, the optical splitter module that has comprised W optical splitter, the Photoelectric Detection module, control treatment module, the fibre delay line module that has comprised W fibre delay line has comprised one 2 * 2 exchange and has reached (W-1) Switching Module of individual 1 * 2 exchange, and emission wavelength is λ
iReflector, road module and multiplexer are formed under the wavelength.
The input optical fibre that carries W wavelength connects the input of demodulation multiplexer, demodulation multiplexer with each input wavelength separately, its W output connects the input of W optical splitter in the optical splitter module respectively, and two outputs of each optical splitter connect Photoelectric Detection module and fibre delay line module respectively.The optical splitter number that comprises in the optical splitter module equals incoming wave long number W, corresponding one by one each input wavelength.By optical splitter, each input wavelength signal has been divided into two parts by 90: 10 power ratio, and a lower-powered part is admitted to the Photoelectric Detection module respectively, and the output of Photoelectric Detection module connects control treatment module.The part that each optical splitter power output is bigger is admitted to the fibre delay line module, and the delay line number that comprises in the fibre delay line module equals incoming wave long number W, and corresponding one by one each input wavelength is finished the input wavelength signal is carried out delay process.The output of fibre delay line module connects the Switching Module input, and the output of control treatment module connects the input of reflector and the control end of Switching Module, finishes the control to them.Switching Module by one 2 * 2 the exchange and (W-1) individual 1 * 2 the exchange form, one of them input of 2 * 2 exchanges is connected to the output of reflector in the Switching Module, another input of these 2 * 2 exchanges has connected by delay line module comes input wavelength signal that wavelength is identical with transmitter wavelength.(W-1) input of individual 1 * 2 exchange connect one to one respectively other all by each input wavelength signal of delay line module output.The output of Switching Module is made up of the output of 2 * 2 exchanges and all 1 * 2 exchanges, and one of them output of 2 * 2 exchanges and all 1 * 2 exchanges is connected to road module under the wavelength, and their another output is connected to the input of multiplexer; The output of multiplexer connects output optical fibre.
Reflector among the present invention can only send grouping with fixed wave length, and the road module can be handled the grouping in all wavelengths under the wavelength.
Be fairness that guarantees network and the transmission of supporting the variable length grouping, the control treatment module among the present invention has adopted the frame structure that divides time slot, and each time slot has adopted the word location of 32 bits.Total length is 1500 bytes, is the divide into groups maximum of typical peak value length of IP.Structure of time slot is as shown in the table: 012 30 1234567890123456789012345678901
| ??S | ??COS | ????TTL | ?M | Reserve | Source node address | The destination node address | |
| Fairness speed | Cyclic redundancy check (CRC) 1 | ||||||
| The load Length Indication | Deviator | ||||||
| Cyclic redundancy check (CRC) 2 | Data message+byte of padding | ||||||
Wherein, " S " is the status field, and length is 1 bit, the free time/busy condition of indication time slot; " COS " is type of service, and length is 3 bits; " TTL " is professional life span, has only destination node to deal with this territory, and destination node is delivered to it Access Network or wide area network after with this area update again, by network processes subsequently; " M " is the broadcasting indication bit, and broadcast is peeled off by source node; Reserve 3 bits and be used for expansion; Source node address and destination node address are 8 bits, can indicate 256 nodes at most, enough MAN networkings; " CRC
1" and " CRC
2" be respectively applied for time slot head and load Length Indication are partly made cyclic redundancy check (CRC); " load Length Indication " is 16 bits, the block length of indication actual transmissions; " deviator " is used to indicate the grouping serial number of source node transmission, and destination node is with its user data information of recombinating; " fairness speed " has taken 3 bytes, the transmission rate of indication sending node when setting out on a journey business; The load area of structure of time slot is variable, can support the IP Packet Service of variable-length, and when the grouping that transmits was not filled up loading section, node can replenish byte of padding.
Beginning at each time slot, the control treatment module of node can be according to the testing result of each wavelength signals of loop sent into from the Photoelectric Detection module that is obtained, and the historical record of preserving in conjunction with control treatment module, it is the parameter of other node, decide the connection status of Switching Module, thereby finish the reception and the process of transmitting of grouping in current time slots.Concrete treatment step is:
(1) if new boundary of time slot no show wait for.Otherwise, change step 2;
(2) for all input wavelengths, if grouping need be under this node the road, change step 3; If have grouping need be under this node the road, judge then whether the wavelength on road has comprised the wavelength identical with the transmission wavelength of this node down, if the relevant parameter value of record source node numbering and this wavelength time slot head is changeed step 4, otherwise change step 3;
(3) if this node sends the wavelength free time, change step 4; Otherwise record sends the source node and the destination node numbering of grouping with the transmission wavelength of this node, and writes down the relevant parameter value of this wavelength time slot head.Change step 1;
(4) if the transmission rate of this node does not satisfy fairness speed, the connection status of each exchange in the Switching Module is set, that is: reception needs the entrained grouping of wavelength on road down, control reflector simultaneously and fill in each interior overhead field of current time slots (status field, source, destination node numbering, fairness speed, check digit etc.), send grouping.Change step 1; If the transmission rate of this node satisfies fairness speed,,, find out the node set N that does not satisfy fairness speed from sending all identical sending nodes of wavelength with this node then according to the processing record of control treatment module to former time slot.If to any one the node n among the N, the destination node of this node is the upstream node of n, and when a last time slot, this node is not the intermediate node of node n, the connection status of each exchange in the Switching Module then is set, receive the grouping of respective wavelength time slot, control reflector simultaneously and fill in each interior overhead field of current time slots, send grouping.Otherwise this node does not send grouping.Change step 1.
The node structure that the present invention proposes has following characteristics: when grouping does not arrive destination node, can directly pass intermediate node, can not significantly not reduced required electric buffer and the Business Processing time delay of intermediate node by road processing down; Node can receive the grouping of all channels simultaneously, does not have the conflict of branch group of received, has improved node flow and professional mean transit delay; Do not have tuning part, reduced design complexities and cost; When the output of Switching Module was connected under the wavelength road processing module, its grouping of carrying can't continue to enter looped network again, had accomplished that very like a cork destination node peels off business, helped improving the flow of the whole network; The whole network does not have Dedicated Control Channel, all wavelengths all can be used for transport service, has improved resource utilization; When multicast functionality was supported in 2 * 2 and 1 * 2 exchange, node structure of the present invention can be supported multicast and broadcasting, both can support source node to peel off business, but also the support purpose node is peeled off business, all not light requirement electric light conversion; Time slot head overhead byte is very little, has only taken 13 bytes, and expense is (13/1500) * 100%＜1%.
Node structure novelty of the present invention can adopt the optical device of present commercialization, and node sends grouping with fixed wave length, does not need tuning device can finish reception to a plurality of wavelength signals simultaneously, and the reception conflict situations that exists in the FT-TR structure can not take place.Simultaneously, although this structure has adopted the time slot of fixed length, it supports the transmission of variable length grouping, and the grouping transmitting-receiving does not need the wavelength dedicated channel to control, and implementation method is simple, can improve resource utilization greatly.
Node structure of the present invention can be advantageously applied to the strong metropolitan area looped network node device of business burst.
Description of drawings
Accompanying drawing 1 is for supporting the single fiber node structure schematic diagram of W wavelength, and the transmission wavelength of node is λ
i
Accompanying drawing 2 is the framework based on accompanying drawing 1, number of wavelengths W=4, and the transmission wavelength of node is λ
i=λ
3The time the node structure schematic diagram.
Accompanying drawing 4 is the grouping send mode based on accompanying drawing 3, and in the grouping at node 7 places transmitting-receiving process, among the figure, the black solid line of 2 * 2 exchanges and 1 * 2 exchange inside represents to exchange the connection status after the Be Controlled module controls.
Accompanying drawing 5 is 16 single fiber looped networks of forming based on the node structure of accompanying drawing 2.Number of wavelengths in the optical fiber is 4, and numbering is respectively λ
1, λ
2, λ
3And λ
4The transmission wavelength that is numbered the node of i is λ
[(i-1) mod 4]+1Node 1,2,3 and 4 schematic diagrames that have broadcast packe to transmit constantly.
Accompanying drawing 6 is based on the network architecture of accompanying drawing 5 and grouping send mode, the connected mode after the control treatment module of node 5 is controlled its Switching Module (representing with black solid line).
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention and embodiment are described.
Accompanying drawing 1 through the processing of each functional unit of node and module, is delivered to wavelength signals in the schematic diagram of output optical fibre for after the input optical fibre loop with W wavelength enters node.Node structure has comprised the optical splitter module of W optical splitter, the Photoelectric Detection module by a demodulation multiplexer, control treatment module, the fibre delay line module that has comprised W fibre delay line has comprised one 2 * 2 exchange and has reached (W-1) Switching Module of individual 1 * 2 exchange, and emission wavelength is λ
iReflector, road module and multiplexer are formed under the wavelength.The input optical fibre that carries W wavelength at first enters the input of demodulation multiplexer when arriving node, it with each input wavelength separately; Subsequently, this W is entered the optical splitter module by the wavelength of demultiplexing, and the optical splitter number that comprises in the optical splitter module equals incoming wave long number W, corresponding one by one each input wavelength; By optical splitter, each input wavelength signal has been divided into two parts by 90: 10 power ratio, and a lower-powered part is admitted to the Photoelectric Detection module respectively; The output of Photoelectric Detection module is admitted to control treatment module; The part that each optical splitter power output is bigger is admitted to the fibre delay line module, and the delay line number that comprises in the delay line module equals incoming wave long number W, corresponding one by one each input wavelength, and they finish the delay process to the input wavelength signal; Behind the delayed wire delay of input wavelength signal, enter the Switching Module input, Switching Module by one 2 * 2 the exchange and (W-1) individual 1 * 2 the exchange form; The control end of wavelength stationary transmitters and Switching Module is linked in the output of control treatment module respectively, finishes the control to them; One of them input of 2 * 2 exchanges are connected to the output of reflector in the Switching Module, and another inputs of this 2 * 2 exchanges has connected by delay line module comes the input wavelength signal that wavelength is identical with transmitter wavelength.(W-1) input of individual 1 * 2 exchange connect one to one respectively other all by wavelength signals of delay line module output; The output of Switching Module is made up of the output of 2 * 2 exchanges and all 1 * 2 exchanges.One of them output of 2 * 2 exchanges and all 1 * 2 exchanges is connected to road module under the wavelength, and their another output is connected to the input of multiplexer; The output of multiplexer connects the output optical fibre loop.
By accompanying drawing 1 as seen, because the wavelength of reflector is λ
i, so the wavelength of the connection of two inputs of 2 * 2 exchanges in the Switching Module is λ
i, respectively from the reflector of node and input loop.
Accompanying drawing 2 is the framework based on accompanying drawing 1, during number of wavelengths W=4, and the annexation schematic diagram of each functional unit of intranodal and module.After input optical fibre enters node, at first by demodulation multiplexer with wavelength X
1, λ
2, λ
3, λ
4Separately; Subsequently, wavelength X
1, λ
2, λ
3, λ
4Enter the optical splitter module, 4 optical splitters in the optical splitter module have been divided into two parts by 90: 10 power ratio with these 4 wavelength signals; That less a part of signal of optical splitter power output is admitted to the Photoelectric Detection module respectively; That a part of signal that power output is bigger is admitted to the fibre delay line module, and 4 delay lines in this module postpone to handle to these 4 wavelength signals respectively; After the Photoelectric Detection module has been finished analysis to the state of 4 wavelength, testing result is delivered to control treatment module, control treatment module can set the state of each exchange in the Switching Module before delay line output wavelength signal, simultaneously, also can the local reflector of control send grouping; 4 outputs in reflector and the delay line module all will exchange processing by Switching Module, and Switching Module has comprised 31 * 2 exchanges and 12 * 2 exchange, and the emission wavelength of local reflector is λ
3, so reflector and from delay line, exporting, wavelength also is λ
3Two outputs be connected to two inputs of 2 * 2 exchanges, the inputs of all the other 31 * 2 exchanges are other output of connection delay lines respectively, their wavelength is respectively λ
1, λ
2, λ
4After handling through Switching Module, input wavelength may be on this underground road, the input that also may enter multiplexer with the emission wavelength of this locality, multiplexer with these signal multiplexings after, send into loop output at last.
(1) if new boundary of time slot no show wait for.Otherwise, change step 2;
(2) information of sending into by the Photoelectric Detection module as can be known, input wavelength λ
1, λ
2, λ
3And λ
4On all carry grouping, their source node is respectively 1,2,3 and 4, destination node is respectively 7,8,7 and 10.As seen, have grouping need be under this node the road, and, need down that the wavelength on road has comprised the wavelength identical with the transmission wavelength of this node, i.e. λ
3, therefore, the relevant parameter value of the control treatment module record node 3 current time slots that send is changeed step 4;
(3)；
(4) as can be known, even the transmission rate of node 7 has satisfied fairness speed, whether it sends divides into groups also can not impact sending the wavelength node 3,11 and 15 identical with it, and promptly node 7 can send grouping certainly by accompanying drawing 3.Therefore, node 7 sets gradually the exchange in the Switching Module from top to bottom and is states such as " intersection ", " leading directly to ", " intersection ", " leading directly to ".Thereby, input wavelength λ
1And λ
3On be grouped in 7 times roads of node, enter road module under the wavelength of node 7.The control treatment module of node 7 will be controlled reflector and fill in the header byte that it sends the wavelength time slot, and send grouping.The grouping of its transmission is in company with input wavelength λ
2, λ
4On grouping together output to the multiplexer input by Switching Module, the wavelength signals of the last output of multiplexer has only 3 wavelength to carry grouping, is respectively λ
2, λ
3, λ
4, and wavelength X
1Idle, can be used for next node.
In the above-mentioned steps, step (3) can not be performed, and therefore, has only a numbering.The purpose that keeps this step is in order to contrast with 4 steps of aforementioned groupings transmitting-receiving process better.
As seen grouping by accompanying drawing 4 receives and dispatches process, and node 7 needs tuning two groupings that wavelength is entrained that promptly receive simultaneously.
Accompanying drawing 5 is 16 single fiber looped networks of forming based on the node structure of accompanying drawing 2.Number of wavelengths in the optical fiber is 4, and numbering is respectively λ
1, λ
2, λ
3And λ
4The transmission wavelength that is numbered the node of i is λ
[(i-1) mod 4]+1Node 1,2,3 and 4 schematic diagrames that have broadcast packe to transmit constantly.As seen from the figure, because node 1,2,3 and 4 transmissions is broadcast packe, peeling off of they will be finished by source node, and intermediate node can only receive these groupings, and can not peel off these groupings.
Accompanying drawing 6 is based on the network architecture of accompanying drawing 5 and grouping send mode, the connected mode after the control treatment module of node 5 is controlled its Switching Module.As seen, because the Photoelectric Detection module of node 5 detects 4 input wavelengths and all carries broadcast packe, therefore, its transmission wavelength is occupied, the business of can not setting out on a journey, in addition, it can not be peeled off these groupings, therefore when receiving the entrained grouping of all input wavelengths from loop, the exchange of Switching Module inside all has been configured to the multicast form, i.e. two output ports of each exchange are wanted the output wavelength signal simultaneously.
Claims (4)
1, support the node structure of variable length grouping in a kind of metropolitan area looped network, comprise demodulation multiplexer, the optical splitter module, the Photoelectric Detection module, control treatment module, the fibre delay line module, Switching Module, reflector, road module and multiplexer under the wavelength, the input optical fibre that it is characterized in that carrying W wavelength connects the input of demodulation multiplexer, the output of demodulation multiplexer connects the input of optical splitter module respectively, the optical splitter number that comprises in the optical splitter module equals incoming wave long number W, corresponding one by one each input wavelength, pass through optical splitter, each input wavelength signal is divided into two parts by 90: 10 power ratio, a lower-powered part is admitted to the Photoelectric Detection module respectively, the output of Photoelectric Detection module connects control treatment module, the part that each optical splitter power output is bigger is admitted to the fibre delay line module, the delay line number that comprises in the fibre delay line module equals incoming wave long number W, corresponding one by one each input wavelength, finish the input wavelength signal is carried out delay process, the output of fibre delay line module connects the Switching Module input, the output of control treatment module connects the input of reflector and the control end of Switching Module, Switching Module by one 2 * 2 the exchange and (W-1) individual 1 * 2 the exchange form, one of them input of 2 * 2 exchanges is connected to the output of reflector in the Switching Module, another input of these 2 * 2 exchanges has connected is come by delay line module, the input wavelength signal that wavelength is identical with transmitter wavelength, (W-1) input of individual 1 * 2 exchange connect one to one respectively other all by each input wavelength signal of delay line module output, the output of Switching Module is made up of the output of 2 * 2 exchanges and all 1 * 2 exchanges, one of them output of 2 * 2 exchanges and all 1 * 2 exchanges is connected to road module under the wavelength, their another output is connected to the input of multiplexer, and the output of multiplexer connects output optical fibre.
2, support the node structure of variable length grouping in the metropolitan area as claimed in claim 1 looped network, it is characterized in that described reflector can only send grouping with fixed wave length.
3, support the node structure of variable length grouping in the metropolitan area as claimed in claim 1 looped network, it is characterized in that road module under the described wavelength can handle the grouping in all wavelengths.
4, support the node structure of variable length grouping in the metropolitan area as claimed in claim 1 looped network, it is characterized in that described control treatment module adopts the frame structure that divides time slot, each time slot adopts the word location of 32 bits, beginning at each time slot, the testing result of each wavelength signals of loop of sending into according to the Photoelectric Detection module that obtains in conjunction with the parameter of other node of preserving, determines the connection status of Switching Module in current time slots, thereby finish the reception and the process of transmitting of grouping, concrete treatment step is:
(1) if new boundary of time slot no show wait for, otherwise change step 2;
(2) for all input wavelengths, if grouping need be under this node the road, change step 3; If have grouping need be under this node the road, judge then whether the wavelength on road has comprised the wavelength identical with the transmission wavelength of this node down, if the relevant parameter value of record source node numbering and this wavelength time slot head is changeed step 4, otherwise change step 3;
(3) if this node sends the wavelength free time, change step 4; Otherwise record sends the source node and the destination node numbering of grouping with the transmission wavelength of this node, and writes down the relevant parameter value of this wavelength time slot head, changes step 1;
(4) if the transmission rate of this node does not satisfy fairness speed, the connection status of each exchange in the Switching Module is set, that is: receiving needs the entrained grouping of wavelength on road down, controls reflector simultaneously and fills in each interior overhead field of current time slots, send grouping, change step 1; If the transmission rate of this node satisfies fairness speed, then according to the processing record of control treatment module to former time slot, from sending all identical sending nodes of wavelength with this node, find out the node set N that does not satisfy fairness speed, if to any one the node n among the N, the destination node of this node is the upstream node of n, and when a last time slot, this node is not the intermediate node of node n, and connection status of each exchange in the Switching Module then is set, receive the grouping of respective wavelength time slot, control reflector simultaneously and fill in each interior overhead field of current time slots, send grouping, otherwise, this node does not send grouping, changes step 1.
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| WO2008067746A1 (en) * | 2006-12-08 | 2008-06-12 | Huawei Technologies Co., Ltd. | A method and device for stabilizing multi-channel optical signal wavelength |
| CN101013990B (en) * | 2006-11-24 | 2010-05-26 | 北京邮电大学 | Optical burst ring network and its node optical path system based on fixed transmission and tunable reception |
| WO2014071631A1 (en) * | 2012-11-12 | 2014-05-15 | 华为技术有限公司 | Wavelength division multiplexing optical network transmission method and apparatus |
| CN105792030A (en) * | 2014-12-24 | 2016-07-20 | 中兴通讯股份有限公司 | Service span-ring realization method of optical burst transport network and corresponding master nodes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010061613A (en) * | 1999-12-28 | 2001-07-07 | 윤종용 | Node structure of wavelength division multiplexing system for modular upgradabilty |
| US6452546B1 (en) * | 2000-06-14 | 2002-09-17 | Hrl Laboratories, Llc | Wavelength division multiplexing methods and apparatus for constructing photonic beamforming networks |
| CN1142641C (en) * | 2002-06-06 | 2004-03-17 | 上海交通大学 | Intelligent Optical/Electrical/Optical Transponder for Metro Flexible Packet Fiber Ring Network |
| CN1423447A (en) * | 2002-12-19 | 2003-06-11 | 上海交通大学 | Classified exchange optical cross node structure based on information flow classifying model |
-
2004
- 2004-05-13 CN CNB2004100183032A patent/CN1294726C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013990B (en) * | 2006-11-24 | 2010-05-26 | 北京邮电大学 | Optical burst ring network and its node optical path system based on fixed transmission and tunable reception |
| WO2008067746A1 (en) * | 2006-12-08 | 2008-06-12 | Huawei Technologies Co., Ltd. | A method and device for stabilizing multi-channel optical signal wavelength |
| CN1976262B (en) * | 2006-12-08 | 2011-04-20 | 华为技术有限公司 | Method and apparatus for stabilizing multi-channel light wavelength |
| US8340525B2 (en) | 2006-12-08 | 2012-12-25 | Huawei Technologies Co., Ltd. | Method and device for stabilizing multi-channel optical signal wavelengths |
| WO2014071631A1 (en) * | 2012-11-12 | 2014-05-15 | 华为技术有限公司 | Wavelength division multiplexing optical network transmission method and apparatus |
| CN105792030A (en) * | 2014-12-24 | 2016-07-20 | 中兴通讯股份有限公司 | Service span-ring realization method of optical burst transport network and corresponding master nodes |
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| Publication number | Publication date |
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| CN1294726C (en) | 2007-01-10 |
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