CN100428655C - Node structure in optical group transmission network and optical channel set-up mode - Google Patents
Node structure in optical group transmission network and optical channel set-up mode Download PDFInfo
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- CN100428655C CN100428655C CNB2005100209268A CN200510020926A CN100428655C CN 100428655 C CN100428655 C CN 100428655C CN B2005100209268 A CNB2005100209268 A CN B2005100209268A CN 200510020926 A CN200510020926 A CN 200510020926A CN 100428655 C CN100428655 C CN 100428655C
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Abstract
The present invention relates to a node structure of wavelength division multiplexing light grouping transmission networks, which comprises an input-output interface, an information processing module, light transmitters and light receivers. The present invention is characterized in that the light transmitters and the light receivers are a plurality of light transmitters and light receivers with fixed wavelengths. A light channel setting mode of wavelength division multiplexing light grouping transmission networks is characterized in that the number of the receivers with fixed wavelengths of nodes in setting networks is equal to the number of light channels in networks; the nodes in the networks are divided into a plurality of sets; all of the nodes in the same node set use the same channel set; the channel sets used by the node sets are divided into main channels and auxiliary channels; the main channels and the auxiliary channels have the following configuration principle: the main channels of the node sets are orderly the auxiliary channels of the other node set and form a closed loop with connected head and tail. The technical scheme of the present invention can cause the performance of light grouping transmission networks to be basically consistent with the situations at the time of the configuration of high speed tunable light transmitters and greatly saves network cost.
Description
Affiliated technical field
The invention belongs to the optical communication technique field, particularly the set-up mode of node structure and optical channel in the multi-channel optical group transmission network.
Background technology
Optical communication net is a communication network of transmitting information with the form of light, is made of node (website) and the optical fiber that connects each node.On latticed form, stellate reticulum, ring network, mesh network etc. are arranged, as shown in Figure 1 to Figure 3, Fig. 4 is the basic structure schematic diagram of each node.Optical communication net has the branch of local area network (LAN), metropolitan area network and wide area network on coverage.Ring network and mesh network are two kinds of principal modes of metropolitan area network and wide area network.In the early 1990s, the channel quantity in the optical communication net only is 1, promptly has only the light signal of a wavelength in transmission information in an optical fiber.Be accompanied by popularizing rapidly of the explosive increase of traffic carrying capacity in the communication network, particularly Internet, the single channel optical-fiber network more and more can not satisfy user's demand, presses for to adopt new technology to improve network capacity.At this moment, wide-band optical amplifier is succeeded in developing, make a plurality of optical channels grow distance transmission simultaneously by simple optical fiber, because each node can send or reception information by a plurality of channels, the transmittability of optical communication net is significantly improved, wavelength division multiplexing (the WDM:Wavelength Division Multiplexing) technology that Here it is extensively adopts at present.Because (number of channel of present commercial WDM net is generally tens) that the optical channel number that transmits simultaneously on an optical fiber is always limited, so still have a problem that how to improve the optical channel level of resources utilization for the WDM net, the light transmitted in packets is exactly a kind ofly can effectively improve the information transmission mode of the optical channel level of resources utilization.
Because the light transmitted in packets is more suitable for the current IP operation that develops rapidly, and can improve the optical channel efficiency of resource, so optical group transmission network is the development trend of following optical communication net, based on the multi-channel optical group transmission network of the WDM technology focus of people's research especially.The general process of message transmission is in the multi-channel optical group transmission network: when a node has packet to send, it at first sends application to center control nodes, center control nodes is according to the length of information to be sent, information such as the busy extent of current each optical channel, for it distributes corresponding channel resources (optical channel that appointment is used and zero-time etc.), and this assignment information fed back to requesting node and destination node, after requesting node is received this information, time of appointment with tunable optical transmitter be tuned on the optical channel of appointment, send corresponding packet by this channel then, in destination node, after receiving the reception data command that center control nodes is sent, will time of appointment with the tunable optical receiver be tuned on the optical channel of appointment, receive corresponding packet by this channel then, so just finished a data transmission packets.In the multi-channel optical group transmission network, because in an optical fiber, have a plurality of channels simultaneously, and an optical transmitting set at a time can only send information by an optical channel, so realize sending information by different optical channels with an optical transmitting set, optical transmitting set need have the humorous ability of emission wavelength tunable, promptly when the optical transmitting set of a node sends a data grouping by a certain optical channel (wavelength) after, it may be tuned on another optical channel (wavelength), and sends other packet by this channel to destination node.For optical receiver, situation is the same substantially.
For the configuration of each node optical transceiver in the optical group transmission network, mainly contain following four kinds of modes: 1, tunable wave length transceiver mode, i.e. TT-TR (Tunable Transmitter-Tunable Receiver) mode; 2, fixed wave length transceiver mode, i.e. FT-FR (Fixed Transmitter-Fixed Receiver) mode; 3, fixed wave length reflector-tunable receiver mode, i.e. FT-TR (Fixed Transmitter-Tunable Receiver) mode; 4, tunable wave length reflector-fixed wave length receiver mode, i.e. TT-FR (Tunable Transmitter-Fixed Receiver) mode.These several mode main distinctions are: be to adopt the tunable optical transceiver or the optical transceiver of fixed wave length.When Fig. 5 is configuration tunable optical transceiver, the structural representation of node.
Configuration for optical transceiver, great majority research select for use can be tuning fast optical transceiver (TT-TR mode), in this case, if a certain optical channel sometime the section busier, and node is when having more packet to send, node can utilize the tunable performance of optical transmitting set, and the outgoing data grouping is sent by other idle channel, and this just makes the average waiting transmitting time of information in the whole network less.So the multi-channel optical group transmission network of configuration fast tunable optical transmitting set not only has higher optical channel utilization ratio, and it waits for that delay performance is better.This is the advantage of configuration tunable optical transceiver, but its price is more expensive, and tuning speed is that the price of the tunable optical transmitter of tens nanoseconds is a U.S. dollar more than 10,000 at present, and the price of fixed wave length reflector only is a RMB more than 1,000, differs tens times.With respect to the TT-TR mode, TT-FR and FT-TR mode have only radiating portion or receiving unit to adopt tunable devices, and cost is relatively low, but this dual mode is for the FT-FR mode, and cost is still higher.Studies show that FT-TR and TT-FR have approximate network performance.The sharpest edges of FT-FR mode are that cost is low, related device is ripe, and with respect to FT-TR, the FT-FR mode can be avoided the collision phenomenon of receiving terminal, that is: when a plurality of packets arrive a certain node simultaneously by different optical channels, because tunable receiver can only receive the information on the channel a moment, this certainly will cause a plurality of packet loss, and for the receiver of fixed wave length, owing to can dispose the receiver of a plurality of different wave lengths simultaneously, all there is fixing receiver to receive information for different channels, so the situation of packet can not occur abandoning.
In the research of relevant FT-FR mode, document [1] ([1] C.S.Jelger, et al.A slotted MAC protocol forefficient bandwidth utilization in WDM metropolitan access ring networks, IEEE Journal onSelected Areas in Communications, vol.21, no.8, pp.1295-1305, Oct.2003) has certain representativeness, it has proposed a kind of media access control protocol of ring network structure based on the FT-FR mode, aspect the configuration of optical transceiver, give the reflector of a fixed frequency of each node configuration and the receiver of a plurality of fixed frequencies.When plan-validation, dispose four wavelength altogether, node is divided into four groups simultaneously, every group takies a wavelength (all utilizing this wavelength to send information) jointly, in addition, each node also disposes the receiver of four fixed wave length, is used for reception information from four different channels.
Document [1] is though avoided the cost problem of selecting for use the fast tunable optical transmitting set to bring preferably, but because it is adopted as the mode that every group node distributes the send channel of a fixed frequency, making between each group node can't shared channel resources, that is: when each node traffic amount of a wavelength of common use is all big, the business of these nodes also can't transmit by other channel, therefore with respect to the situation that disposes tunable optical transmitter, its poor-performing.
Summary of the invention
In order effectively to reduce the cost of wavelength division multiplexing optical group transmission network, avoid adopting the fast tunable optical transmitting set, guarantee that simultaneously network has good channel and shares ability, propose a kind of node structure and corresponding optical channel set-up mode of wavelength division multiplexing optical group transmission network.
Detailed technology scheme of the present invention
A kind of node structure of wavelength division multiplexing optical group transmission network comprises input/output interface, message processing module, optical transmitting set and optical receiver, it is characterized in that, described optical transmitting set and optical receiver are the optical transmitting set and the optical receiver of a plurality of fixed wave length.A plurality of fixed wave length optical transmitting sets (FT1, FT2 ..., FTm) in, each fixed wave length optical transmitting set be operated in respectively different fixed wave length (λ 1, λ 2 ..., λ m) on; A plurality of fixed wave length optical receivers (FR1, FR2 ..., FRn) in, each fixed wave length optical receiver be operated in respectively different fixed wave length (λ 1, λ 2 ..., λ n) on.
A kind of optical channel set-up mode of wavelength division multiplexing optical group transmission network is characterized in that, the quantity of each node fixed wave length receiver in the network is set equates with optical channel number in the network, is convenient to each node reception information from the different optical channels; Node in the network is divided into some groups, and each node in the same groups of nodes all uses identical channel group; The channel group that each groups of nodes is used is divided into main channel and auxiliary channel; The equipping rules of main channel and auxiliary channel is: the main channel of each groups of nodes is followed successively by the auxiliary channel of an adjacent node group, the auxiliary channel of each groups of nodes is followed successively by the main channel of next adjacent node group, there being and having only an identical optical channel between the groups of nodes that guarantees adjacent numbering, and each optical channel all is assigned to two different groups of nodes.Total number of channels in the network can't increase like this.Generally speaking, each node in same group all sends packet by same main channel, when main channel is in " doing " state, and when auxiliary channel is in " spare time " state, Centroid will newly to request be arranged in auxiliary channel, allow source node send corresponding packet by auxiliary channel.
Beneficial effect: after adopting this method, the situation basically identical the when performance of optical group transmission network and configuration fast tunable optical transmitting set, and saved network cost greatly.
Description of drawings
Fig. 1: star optical-fiber network schematic diagram
Fig. 2: optical ring network schematic diagram
Fig. 3: network diaphragm network diagram
Fig. 4: the basic structural representation of node
Fig. 5: the node structure schematic diagram during configuration tunable optical transceiver
Fig. 6: node structure schematic diagram of the present invention
Fig. 7: specific embodiment of the invention node structure schematic diagram
Fig. 8: the offered load peace equalization of the specific embodiment of the invention is treated the relation between time delay
Fig. 9: offered load peace equalization is treated the relation between time delay during configuration fast tunable optical transceiver
Figure 10: offered load peace equalization is treated the relation between time delay when disposing a fixed wave length optical transmitting set
Embodiment
A kind of node structure of wavelength division multiplexing optical group transmission network, comprise input/output interface, message processing module, optical transmitting set and optical receiver, it is characterized in that described optical transmitting set is the optical transmitting set of two fixed wave length, described optical receiver is the optical receiver of 4 fixed wave length.In two fixed wave length optical transmitting sets (FT1, FT2), each fixed wave length optical transmitting set is operated in respectively on two different fixed wave length; In 4 fixed wave length optical receivers (FR1, FR2, FR3, FR4), each fixed wave length optical receiver is operated in respectively on the different fixed wave length (λ 1, λ 2, λ 3, λ 4).
If have 16 nodes (node 1 is to node 16) in network, 4 data channels (channel 1 is to channel 4) can be divided into node 4 groups, one group of per 4 node, and the arrangement of main channel and auxiliary channel is as shown in table 1.
The configuration mode of table 1 main channel and auxiliary channel
In order to verify the validity of this method,, this method and the network delay characteristic that adopts fast tunable optical transmitting set method are contrasted by Computer Simulation.When emulation, the dividing mode and the method for channel allocation of groups of nodes are as shown in table 1, the receiving terminal of each node all disposes the receiver (as shown in Figure 7) of four fixed wave length, (one is operated in the main channel wavelength to the optical transmitting set of two fixed wave length of transmitting terminal configuration, another is operated in the auxiliary channel wavelength), latticed form adopts the ring network structure.Fig. 8 is the simulation result of this programme, the simulation result when Fig. 9 is configuration fast tunable optical transmitting set, the simulation result when Figure 10 is fixed wave length optical transmitting set of each node configuration.By Fig. 8 and Fig. 9 as can be seen, under these two kinds of configuration modes, the average waiting delay parameter basically identical of network (unit is " an average packet length "), promptly this programme can reach effect the same when adopting the fast tunable optical transmitting set.As seen from Figure 10, the delay character when disposing a fixed wave length optical transmitting set is relatively poor, and when offered load was 0.99, its average waiting time delay (being about 5.6 average packet length) was 4 times when disposing the fast tunable optical transmitting set.
Claims (3)
1, a kind of node structure of wavelength division multiplexing optical group transmission network comprises input/output interface, message processing module, optical transmitting set and optical receiver; It is characterized in that, 2 fixed wave length optical transmitting sets of each node configuration, and a plurality of fixed wave length optical receiver, the quantity of fixed wave length optical receiver equates with optical channel number in the optical fiber, is convenient to each node reception information from the different optical channels; 2 fixed wave length optical transmitting sets are operated in respectively on 2 different fixed wave length, and a plurality of fixed wave length optical receivers are operated in respectively on a plurality of different fixed wave length; Optical channel configuration mode with wavelength division multiplexing optical group transmission network of above-mentioned node structure is: the node in the network is divided into some groups, and each node in the same groups of nodes all uses 2 optical channels to send data, and one is main channel, and another is an auxiliary channel; The main channel of each groups of nodes is followed successively by the auxiliary channel of an adjacent node group, the auxiliary channel of each groups of nodes is followed successively by the main channel of next adjacent node group, there being and having only an identical optical channel between the groups of nodes that guarantees adjacent numbering, and each optical channel all is assigned to two different groups of nodes.
2, the node structure of wavelength division multiplexing optical group transmission network according to claim 1 is characterized in that, the quantity of described fixed wave length optical receiver is 4.
3, a kind of optical channel method to set up of wavelength division multiplexing optical group transmission network is characterized in that, the quantity of each node fixed wave length receiver in the network is set equates with optical channel number in the network, is convenient to each node reception information from the different optical channels; Node in the network is divided into some groups, and each node in the same groups of nodes all uses 2 optical channels to send data, and one is main channel, and another is an auxiliary channel; The equipping rules of main channel and auxiliary channel is: the main channel of each groups of nodes is followed successively by the auxiliary channel of an adjacent node group, the auxiliary channel of each groups of nodes is followed successively by the main channel of next adjacent node group, there being and having only an identical optical channel between the groups of nodes that guarantees adjacent numbering, and each optical channel all is assigned to two different groups of nodes.
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| CN101640568A (en) * | 2008-07-30 | 2010-02-03 | 华为技术有限公司 | Method, device and system for transmitting and receiving client signals |
| CN102315894B (en) * | 2010-06-29 | 2014-08-13 | 富士通株式会社 | Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5452115A (en) * | 1993-04-22 | 1995-09-19 | Kabushiki Kaisha Toshiba | Communications system |
| CN1134638A (en) * | 1994-12-28 | 1996-10-30 | 佳能株式会社 | Network system as no arbitration control required, node device utilized in network system, and transmission control method for node device |
| US20040141746A1 (en) * | 2001-03-09 | 2004-07-22 | Magnus Oberg | Flexible wdm ring network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5452115A (en) * | 1993-04-22 | 1995-09-19 | Kabushiki Kaisha Toshiba | Communications system |
| CN1134638A (en) * | 1994-12-28 | 1996-10-30 | 佳能株式会社 | Network system as no arbitration control required, node device utilized in network system, and transmission control method for node device |
| US20040141746A1 (en) * | 2001-03-09 | 2004-07-22 | Magnus Oberg | Flexible wdm ring network |
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