CN1275413C - Burst counting and multiplexing method for avoiding optical signal conflict in optical network - Google Patents
Burst counting and multiplexing method for avoiding optical signal conflict in optical network Download PDFInfo
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Abstract
The present invention relates to a statistical multiplexing method of light burst in an optical communication network, which is suitable for a unidirectional reserved ring topology network. The method comprises the following steps: a network node receives a service packet from a subnet to form a burst data packet; a light burst control packet is formed; the light burst control packet is sent out through a control channel to reserve bandwidth resources for a corresponding light burst data packet at a downstream node; the downstream network node receives the light burst control packet, photoelectric conversion is performed, and the light burst control packet is analyzed and processed in an electrical field; a rapid adjustable OADM module is allocated at the time assigned by the light burst control packet to get the light burst data packet transparent so as to pass through an intermediate network node; if the bandwidth resources which are requested to be reserved are in conflict with the bandwidth resources that are already reserved for the light burst data of some network node, the requested bandwidth resources that are in conflict in the light burst data packet are removed, and the light burst control packet in a release channel is sent out so as to avoid conflict.
Description
Technical field
The present invention relates to the multiplexing method of optical communication network, refer to a kind of burst statistic multiplexing method that can effectively avoid conflict especially.
Background technology
Along with the intensification of the level of informatization, the mankind are more and more higher to the requirement of capacity, speed, quality and the grade of service of communication.The popularizing of personal computer and Internet, data service have proposed revolutionary requirement with the develop rapidly of E-mail communication to current communication network.The multitiered network structure that is made of operation layer, synchronous digital hierarchy (SDH) layer and physical layer will no longer can satisfy the growth of data service from now at present, and any network with SDH multiplexing structure all will cause unnecessary opto-electronic conversion and improve forwarding cost and complicated operation degree.Wavelength-division multiplex technique (WDM) has been widely used in telecommunications network at present, and based on the multi-wavelength networking technology of WDM multichannel transmission and the optical add/drop multiplexer (OADM) that can network flexibly, light bifurcation connector (OXC) equipment also in develop rapidly, therefore people expect to use the multiplexed optical link of this optical-fiber network, and are effectively that the router of Internet is directly interconnected.
Up to now, the better solution that has proposed mainly contains three kinds: a kind of multi-protocols wavelength exchange (MR λ S) technology that is based on, and promptly optical circuit exchanges (OCS); Another kind is light packet switching (OPS) technology, and another is exactly light burst-switched (OBS) technology.Introduce the key issue of their characteristics and existence thereof below respectively.
A、OCS
In view of the multiprotocol label switching (mpls) technology with based on the development and the progress of the light networking technology of wavelength level, can people naturally and understandably expect and MPLS technology and optical-fiber network technology being combined, promptly based on multi-protocols wavelength exchange (MP λ S) technology.This scheme combines the traffic engineering key-course technology of present advanced MPLS in the OXC/OADM technology, by restructural with controlled exchange mechanism, programmable OXC and OADM or WADM (light wave add-drop multiplexer), and corresponding intelligent control module is realized photosphere exchange and route, so not only reduced the complexity of network management, and ip router can dynamically obtain required bandwidth from Optical Transmission Network OTN, therefore make allocated bandwidth as required become possibility, what be specially adapted to be made up of reconfigurable OXC and OADM is in the optical interconnection network system of core with the data service.
Also there are many restrictions at present in the exchange of multi-protocols wavelength.The one, optical network node can not merge to a plurality of wavelength on the wavelength; Another restriction is that optical network node can not be carried out in the light territory and is similar to that label is popped, stacked operation; Another main restraining factors are granularity problem of resource allocation, because the restriction of technology, the wavelength LSR can only provide very small amount of practicability optical channel passage, therefore must cause the waste of resource when setting up the optical channel passage for fixed-bandwidth.
Be not difficult to find out, still do not break away from the yoke of circuit exchange mode based on the optical-fiber network of wave length routing, the exchange granularity is thick (wavelength level) too.If carry the data service of representing with IP Bao Wei that is explosive growth with it, then lack flexibility and extremely low to the utilance of optical bandwidth.
B、OPS
The packet switching in electricity territory has obtained immense success, and people have just expected the packet switching (OPS) of light naturally, realizes light classified statistics multiplexing bandwidth resource, improves link utilization.Though packet-switch technology is showing exclusive advantage aspect flexibility and the bandwidth availability ratio, and can share all usable bandwidth resources desirably with very thin exchange granularity, but because the grouping/packet switch of light faces cost and some technology barriers that are difficult to overcome always, as packet synchronization technology, grouping/packet conflict (to the competition of resource) problem and rationally switching fabric and packet format efficiently, thereby the practical stage can not be entered for the moment.
C、OBS
In view of present light signal treatment technology enough ripe as yet, thereby can't realize the actual conditions of full light packet switching, simultaneously in order to overcome the electronic bottleneck problem in the exchange and to improve bandwidth availability ratio, people propose OBS, list of references is seen M.Yoo, M.Jeong and C.Qiao, " A High SpeedProtocol for Bursty Traffic in Optical Networks ", in SPIE ' s All-OpticalCommunication Systems:Architecture, Control and Protocol Issues, Vol.3230, pp.79-90, Nov.1997..
Burst-switched is compared with packet switching and circuit-switched technology, and following advantage is arranged: the exchange granularity greater than packet switching less than circuit switching; Need not the affirmation of destination after bandwidth is set up, time delay is little; Bursty traffic is directly by middle switching node, and operation must be stored-transmit to packet switching on each intermediate node.
The light burst-switched has been alleviated technical barriers such as the stationary problem, exchange rate of OPS, is exactly the packet collisions problem but with OPS a fatal problem is arranged equally.OBS network packets available collision problem solution has following four kinds at present: the one, and the optical fiber extensions; The 2nd, wavelength conversion; The 3rd, penetrate route partially; The 4th, segmentation abandons.But owing to there is not light RAM, the packet collisions problem can't solve all the time at all, to reach realistic scale.According to list of references M.Yoo, C.Qiao and S.Dixit, " QoSPerformance in IP over WDM Networks ", IEEE J.Selected Areas inCommunications (JSAC), Special Issue on the Protocols for NextGeneration Optical Internet, Vol.18, No.10, pp.2062-2071, Oct.2000. reach H.L.Vu, and M.Zukerman, " Blocking probability for Priority Classesin Optical Burst Switching Networks ", IEEE Communications Letters, vol.6, issue 5, pg.214-216, correlation technique among the May 2002. is carried out emulation and analysis result, even single-hop OBS system, 8 wavelength, and support the long conversion of all-wave, when load is 0.4, packet loss＞10
-2Even if, 32 wavelength, when load was 0.5, packet loss was＞10
-4, also generally require 10 much smaller than data network
-5, as shown in Figure 1.
Summary of the invention
Shortcoming in view of prior art, the present invention proposes to avoid fully the multiplexing method of light bursty data packet collisions---light burst statistic multiplexing method, make full use of fast photon technology and electronics storage flexibly, treatment technology, make efficiently statistic multiplexing of bandwidth resources, and by control rationally, avoid the light packet collisions, improved network performance greatly.
The invention provides the burst statistic multiplexing method of avoiding the light signal conflict in a kind of optical-fiber network, be applicable to the ring topology network of unidirectional reservation, comprise the following steps:
Network node receives the traffic packets from subnet, forms the bursty data grouping according to purpose network node address and service classification information; Produce the light burst control grouping of setting up link according to the bursty data grouping information, in the described smooth burst control grouping, comprise the offset time of setting; By control channel above-mentioned smooth burst control grouping is sent, for bursty data is grouped in the downstream node bandwidth resource;
The downstream network node receives above-mentioned smooth burst control grouping, by opto-electronic conversion, and in electric domain analysis, processing; Wherein, if the destination node address of the prominent control grouping of above-mentioned light is this network node, then set up link or discharge link according to its packet type, notify this node in burst control grouping appointment time and wavelength on receive corresponding light bursty data grouping or discharge corresponding resource, be divided into original traffic packets, and send to respectively in separately the purpose subnet; If the destination node address of the prominent control grouping of above-mentioned light is not this network node, be its reservation or release corresponding bandwidth resource then according to its packet type, and modification offset time, send to next node by control channel, and in moment of light burst control grouping appointment, configure adjustable OADM optical add/drop multiplexer module, make the grouping of light bursty data transparent through intermediate network node;
Behind the offset time through light burst control specified in packets, directly on the wavelength of being reserved, send above-mentioned smooth bursty data grouping.Described smooth burst control grouping also comprises packet type, burst length and the wavelength identification information of corresponding light bursty data grouping.
If this network node data channel or control channel bandwidth resources are unavailable, then wait for, when available resources are arranged, by control channel above-mentioned smooth burst control grouping is sent, for the light bursty data is grouped in the downstream node bandwidth resource.
If the bandwidth resources that the bandwidth resources that the request of discovery is reserved and the light bursty data of certain network node have been reserved clash, please remove this network node and be asked the bandwidth resources reserved by the light bursty data of conflict grouping, produce and send the light burst control grouping that discharges resource, packet type is for discharging link, generation avoids conflict, in electric territory the above-mentioned corresponding bursty data grouping of reserving with request of bandwidth resources is stored simultaneously, wait for when resource is idle and retransmitting.
Described network node structure comprises: input/output module, service convergence module, Fast Adjustable OADM module, scheduler module, receiver module, sending module, control module and route switch module; Described input/output module is given subnet from subnet reception business datum or dateout; Classify and converge by assembling module, form the bursty data grouping; Scheduler module is carried out dispatching management according to available resource information, generates the burst control grouping of setting up link; After handling framing via control module again, carry out the electric light conversion then, and the burst control grouping is sent to downstream node by control channel; Behind certain offset time, under the control of scheduler module, configuration sending module and Fast Adjustable OADM module send this light bursty data and divide into groups to downstream node; When control module receives the grouping of light burst control on control channel, carry out opto-electronic conversion simultaneously, parse control information wherein; Be its corresponding light bursty data packet reservation or discharge resource, and constantly configure the adjustable optical add and drop multiplexer device specifying, allow light bursty data this network node of transparent process that divides into groups; If the destination address of this light burst control grouping is this network node, then in moment of its appointment, configure the adjustable optical add and drop multiplexer device, this light bursty data grouping demultiplexing from light path is got off, be sent to receiver module, the light bursty data that will receive in receiver module divides the assembling and dismantling frame, and is sent to route switch module, and these traffic packets are sent to separately subnet respectively; With two light bursty data groupings of upstream node there is if find this node when conflict, under the control of scheduler module,, produces and send the light burst control grouping that discharges link, discharge the corresponding bandwidth resource, in order to avoid resource contention by control module.
Described smooth burst control be grouped in from source node to destination node each node of process, carry out the conversion of photoelectricity light, carry out resource reservation in electric territory; The intermediate node that described smooth bursty data is grouped between source node and the destination node does not carry out the photoelectricity optical processing, in the complete transparent transmission in light territory.
Described ring topology network forms the annular section networking by two back-to-back light burst add-drop multiplexer nodes.
Avoid the burst statistic multiplexing method of light signal conflict in the another kind of optical-fiber network of the present invention, be applicable to the ring topology network of unidirectional reservation, comprise the following steps:
Network node receives the traffic packets from subnet, forms the bursty data grouping according to purpose network node address and service classification information; Produce the grouping of light burst control according to the bursty data grouping information, in the described smooth burst control grouping, comprise the offset time of setting; The grouping of light burst control is sent by control channel, for the light bursty data is grouped in downstream node request bandwidth resource; The downstream network node receives the grouping of light burst control, by opto-electronic conversion, and in electric domain analysis, processing;
Behind the offset time through light burst control specified in packets, allow the grouping of light bursty data, directly on the wavelength of reserving, send the grouping of light bursty data through the time-delay of the fibre delay line (FDL) of a regular length.
If the destination node address of above-mentioned smooth burst control grouping is this network node, then notify this node in burst control grouping appointment time and wavelength on receive corresponding light bursty data grouping and tear it open frame, and send to respectively in separately the purpose subnet.
If the destination node address of above-mentioned smooth burst control grouping is not this network node, then reserve the corresponding bandwidth resource, and revise offset time information for it, send to next node by control channel; The moment in light burst control grouping appointment configures adjustable optical add and drop multiplexer device module, allows the grouping of light bursty data through the time-delay of the fibre delay line of a regular length, and is transparent in intermediate network node; Simultaneously so that its corresponding light burst control packet transaction and reserved resource take place effectively to avoid light bursty data packet collisions.
Above-mentioned network node, its structure comprises: input/output module, service convergence module, Fast Adjustable OADM module, scheduler module, receiver module, sending module, control module and route switch module; The FDL that regular length is wherein arranged in the Fast Adjustable OADM module, described input/output module is given subnet from subnet reception business datum or dateout, is classified by the convergence module and converges, and forms the bursty data grouping; Carry out dispatching management by scheduler module according to available resource information, generate the burst control grouping; After handling framing via control module again, carry out the electric light conversion then, and the burst control grouping is sent to downstream node by control channel; Behind certain offset time, under the control of scheduler module, configuration sending module and Fast Adjustable OADM module are sent to downstream node with this light bursty data grouping; When control module receives the grouping of light burst control on control channel, carry out opto-electronic conversion simultaneously, parse control information wherein; When if the destination address of this light burst control grouping is not the address of this network node, it then is its corresponding light bursty data packet reservation resource, and specifying the moment to configure adjustable OADM, allow light bursty data grouping pass through fibre delay line, after postponing a set time, this network node of transparent process is so that its corresponding light burst control packet transaction and reserved resource effectively avoid conflict; When if the destination address of this light burst control grouping is the address of this network node, then in the moment of its appointment, configure adjustable OADM and other corresponding receiver module, the light bursty data that receives is divided into groups to route switch module; Again according to header and its corresponding burst control grouping information of this bursty data grouping, it is sent to separately subnet respectively.
Described smooth burst control grouping comprises following field: burst data length, offset time, destination address, service type, life span and Frame Check Sequence.
Beneficial effect of the present invention is as follows:
By adopting the loop network topology structure networking, network node and control thereof have been simplified;
By rational unidirectional resource reservation mechanism, avoided the two-way round reservation time delay of OCS, and improved link utilization;
Shift to an earlier date reserved resource by the grouping of light burst control, avoided the conflict between the light burst group, packet loss rate is very little, has improved network performance;
Utilize electrical storage, the bursty data packet loss is avoided in the bursty data grouping that buffer memory is to be sent; Adopt Fast Adjustable OADM, realize the add drop multiplex of wavelet long (grouping of light bursty data), control is simple, and cost is low, and has realized the efficient statistic multiplexing of light grouping (burst).
The present invention need not wavelength conversion, penetrates the conflict settlement mechanism of numerous and diverse poor efficiencys such as route, adjustable FDL partially;
Light burst group statistic multiplexing has realized that efficiently wavelength utilizes again, has made full use of wavelength resource, and bandwidth availability ratio is very high;
Be easy to realize that traffic engineering (te) and protection switch.
Given full play to the advantage of advanced electronic technology and big Capacity Optical switching technology, intermediate node only need be handled the grouping of light burst control, and the grouping of light bursty data is transparent fully straight-through, and throughput is big, and time delay is little;
Cost is low, only needs Fast Adjustable OADM, need not OXC, and optical switch control is simple;
Can be used for the upgrading of existing network, and effectively supporting ring cascade;
Be applied to the next generation and have very strong paroxysmal metropolitan area network or wide area network, make full use of bandwidth resources, save networking, operation and maintenance cost.
Description of drawings
Fig. 1 is the packet loss schematic diagram of single-hop OBS system under different loads, different wave length situation in the prior art.
Fig. 2 is the ring topology network schematic diagram of the suitable unidirectional control of the inventive method.
Fig. 3 is that the inventive method one is met conflict bandwidth-hogging resources mechanism schematic diagram.
Fig. 4 is the inventive method one pairing network node structure schematic diagram.
Fig. 5 postpones to avoid conflict schematic diagram of mechanism for the inventive method two.
Fig. 6 is the inventive method two pairing network node structure schematic diagrames.
Embodiment
Light of the present invention burst multiplexing method is applicable to ring topology network, is referred to as the light multiplexing ring (OBMR) that happens suddenly, network configuration as shown in Figure 2, it is by a plurality of light burst add drop multiplex nodes (OBADM), joining end to end by optical fiber link forms.The OBMR cyclic group encircles in WDM, but with the WDM ring essential difference is arranged, and at each OBADM node, only needs light burst group on the add drop multiplex necessary wavelength, rather than whole wavelength, just can realize efficiently that light bursty data classified statistics are multiplexing.Its link can be unidirectional, also can be two-way, is made up of one or more optical fiber, and a plurality of wavelength are arranged in the every optical fiber.In every one way link, one or more wavelength are arranged as control channel, be used to carry grouping of light burst control and signaling message, all the other channels are all as data channel, and carrying light bursty data divides into groups.Light burst control in the control channel be grouped in the node of process carry out electric treatment, be its corresponding light bursty data packet reservation wavelength bandwidth resource, avoid light bursty data packet collisions, and data channel divides into groups prior reserved resource in the complete transparent transmission of intermediate node according to control, need not the photoelectricity optical processing.Insert the grouping of light bursty data at source node, take out the grouping of light bursty data at destination address, promptly light burst group fraction is inserted multiplexing.Each OBADM node, link to each other with one or more different subnets, and form of service can be varied, can be the most general IP operation again, also can be other any type of business, as ATM(Asynchronous Transfer Mode) cell, Fiber Distributed Data Interface (FDDI) frame or the like.
The same with the SDH ring, OBMR can support a plurality of ring cascades, in tandem node, needs grouping of light burst control and the grouping of light bursty data are handled with the form of electricity, is sent on another ring again, promptly forms a tandem node with two back-to-back OBADM nodes.Introduce two kinds of light burst group statistic multiplexing methods that effectively avoid conflict that are applicable to above-mentioned ring topology below:
One of method that the present invention manages conflict:
Network node receives the traffic packets from subnet, forms the bursty data grouping according to purpose network node address and service classification information;
Produce the light burst control grouping of setting up link according to the bursty data grouping information, the grouping of light burst control comprises packet type, offset time, burst length and the wavelength identification information of corresponding light bursty data grouping;
If this network node data channel or control channel bandwidth resources are unavailable, then wait for, when available resources are arranged, by control channel above-mentioned smooth burst control grouping is sent, for the light bursty data is grouped in the downstream node bandwidth resource;
Through behind the offset time of appointment, needn't wait acknowledge message, directly on the wavelength of being reserved, send above-mentioned smooth bursty data grouping;
The downstream network node receives above-mentioned smooth burst control grouping, by opto-electronic conversion, and in electric domain analysis, processing;
If the destination node address of the prominent control grouping of above-mentioned light is this network node, then set up link or discharge link according to its packet type, notify this node in burst control grouping appointment time and wavelength on receive corresponding light bursty data grouping or discharge corresponding resource;
If the destination node address of the prominent control grouping of above-mentioned light is not this network node, be its reservation or release corresponding bandwidth resource then, and revise offset time according to its packet type, send to next node by control channel;
The moment in light burst control grouping appointment configures adjustable optical add and drop multiplexer device module, makes the grouping of light bursty data transparent in intermediate network node;
If there is not resource contention to take place, destination node receives the light bursty data grouping from source node on will the wavelength of specified moment appointment in the grouping of light burst control, is divided into original traffic packets, and sends to respectively in separately the purpose subnet;
If the bandwidth resources that the bandwidth resources that the above-mentioned request of discovery is reserved and the light bursty data of certain network node have been reserved clash, please remove the bandwidth resources that this network node is asked by the grouping of the light bursty data of conflict, produce and send the light burst control grouping that discharges resource, packet type is for discharging link, generation avoids conflict, in electric territory above-mentioned bursty data grouping is stored simultaneously, wait for when resource is idle and retransmitting.
In sum, the light burst control grouping of the present invention by sending in advance, if finding it clashes certain light burst group of reserved resource and certain node reserved resource, bandwidth-hogging resource then, and discharge the bandwidth resources that light burst group that this node conflicts is with it reserved, generation avoids conflict, the light bursty data grouping that utilizes ripe electronic technology buffer memory flexibly to be seized simultaneously, and wait for when data channel has the free time and retransmitting, as shown in Figure 3, be bandwidth resources preemption mechanism schematic diagram of the present invention, A among the figure, B, C, D, E represents five nodes in the loop chain respectively, A to E, B to E, C to A, D to B, E to B, represent that respectively node A has the light bursty data need be sent to node E, Node B has the light bursty data need be sent to node E, node C has the light bursty data need be sent to node A, node D has the light bursty data need be sent to Node B, node E has the light bursty data need be sent to Node B, three light bursty data groupings are wherein arranged owing to seized with the light bursty data packet collisions of upstream node, these light bursty data groupings are by electric buffer buffer memory, wait for behind the certain hour bandwidth on demand resource again, and retransmit.
If before sending, there is not upstream node to reserve this section resource, show that then this burst group will be sent to the pairing node of its destination address accurately.Simulation analysis studies show that the link utilization of this mechanism is to the maximum about 25%, and network node does not have FDL, and cost is low, and it is shorter to be suitable for link, is suitable for the metropolitan area network of node than comparatively dense.
Above-mentioned network node structure comprises as shown in Figure 4: input/output module, service convergence module, Fast Adjustable OADM module, scheduler module, receiver module, sending module, control module and route switch module; Described input/output module is given subnet from subnet reception business datum or dateout; The business datum that receives by input/output module is classified according to destination address and service type and is converged by assembling module, forms the bursty data grouping; Carry out dispatching management by scheduler module according to available resource information, generate the burst control grouping of setting up link, it comprises packet type, offset time, burst length and the wavelength identification information of the grouping of corresponding light bursty data; After handling framing via control module again, carry out the electric light conversion then, and the burst control grouping is sent to downstream node by control channel; Behind certain offset time, under the control of scheduler module, configuration sending module and Fast Adjustable OADM module send this light bursty data and divide into groups to downstream node; When control module receives the grouping of light burst control on control channel, carry out opto-electronic conversion simultaneously, parse control information wherein; If the packet type of light burst control grouping is to discharge link, then discharge corresponding resource; If the packet type of light burst control grouping is to set up link, when then the destination address that divides into groups as if this light burst control is not the address of this network node, then be its corresponding light bursty data packet reservation or release resource, and specifying the moment to configure the adjustable optical add and drop multiplexer device, allow light bursty data this network node of transparent process that divides into groups, if the destination address of this light burst control grouping is this network node, then in moment of its appointment, configure adjustable optical add and drop multiplexer device and other corresponding receiver module, divide the assembling and dismantling frame with the light bursty data that receives, and be sent to route switch module, these traffic packets are sent to separately subnet respectively; With two light bursty data groupings of upstream node there is if find this node when conflict, under the control of scheduler module,, produces and send the light burst control grouping that discharges link, discharge the corresponding bandwidth resource, in order to avoid resource contention by control module.
Two of the method that the present invention manages conflict:
The light burst statistic multiplexing method of the another kind of optical communication network of the present invention is applicable to comprise the following steps: the ring topology network of unidirectional reservation
Network node receives the business from subnet, forms the bursty data grouping according to purpose network node address and service classification information;
Produce the grouping of light burst control according to the bursty data grouping information, it comprises offset time, burst length and the wavelength identification information of the grouping of corresponding light bursty data;
When if this network node dateout channel and control channel resource are unavailable, then wait for, when available resources are arranged, the grouping of light burst control is sent by control channel, for the light bursty data is grouped in downstream node request bandwidth resource;
Through behind the offset time of appointment, needn't wait acknowledge message, directly on the wavelength of reserving, send the grouping of light bursty data;
The downstream network node receives the grouping of light burst control, by opto-electronic conversion, and in electric domain analysis, processing;
If the destination node address of above-mentioned smooth burst control grouping is this network node, then notify this node in burst control grouping appointment time and wavelength on receive corresponding light bursty data grouping;
If the destination node address of above-mentioned smooth burst control grouping is not this network node, then reserve the corresponding bandwidth resource, and revise offset time information for it, send to next node by control channel;
The moment in light burst control grouping appointment configures adjustable optical add and drop multiplexer device module, allows the grouping of light bursty data through the time-delay of the FDL of a regular length, and is transparent in intermediate network node; Simultaneously so that its corresponding light burst control packet transaction and reserved resource take place effectively to avoid light bursty data packet collisions; Destination node receives the light bursty data grouping from source node on will the wavelength of specified moment appointment in light burst control grouping, tears it open frame, and sends to respectively in separately the purpose subnet.
Said method of the present invention is the FDL (being slightly larger than the light bursty data duration of Maximum Burst Size its time of delay) that utilizes regular length, will be through all set times of light bursty data packetization delay of OBADM node, allow the grouping of light burst control be handled and reserved resource, guarantee that simultaneously the light bursty data grouping that this node was sending when the prominent control grouping of light arrived is sent completely on the wavelength of above-mentioned smooth burst control packet reservation, guarantee that the corresponding bursty data grouping of dividing into groups of this burst control can not clash with other bursty data grouping.It is as follows with Fig. 5 to be that example is illustrated, A, B, C, D, E represent five nodes in the loop chain respectively among the figure, A to E, B to E, C to A, D to B, E to B, represent several Business Streams respectively, promptly node A has the light bursty data need be sent to node E, Node B has the light bursty data need be sent to node E, node C to have the light bursty data need be sent to that node A, node D have the light bursty data need be sent to Node B, node E has the light bursty data need be sent to Node B.Each light bursty data is grouped in each node all a fixed delay, in order to avoid conflict takes place between the light burst group.Simulation analysis is the result show, even for having higher paroxysmal business, the method two link utilization also can be up to about 80%, and is very high.Because each node has the FDL of regular length, cost is slightly high, and propagation delay time is bigger, is suitable for the more sparse wide area network of node.
The inventive method two pairing network node OBADM structural representations as shown in Figure 6, the structure of this kind network node and structural difference shown in Figure 4 are: the FDL that regular length is arranged among the Fast Adjustable OADM, will be through regular time of each light bursty data packetization delay of network node, so that its corresponding light burst control packet transaction and reserved resource are effectively to avoid light bursty data packet collisions.
In same OBMS ring, can only use wherein a kind of method.Two or more rings of cascade, available diverse ways, and be independent of each other.The present invention can support multiple signaling message by control channel, is easy to realize traffic engineering (te) and quick protective switch or the like, and extensibility is better.
Claims (14)
1, avoids the burst statistic multiplexing method of light signal conflict in the optical-fiber network, be applicable to the ring topology network of unidirectional reservation, it is characterized in that, comprise the following steps:
Network node receives the traffic packets from subnet, forms the bursty data grouping according to purpose network node address and service classification information;
Produce the light burst control grouping of setting up link according to the bursty data grouping information, in the described smooth burst control grouping, comprise the offset time of setting;
By control channel above-mentioned smooth burst control grouping is sent, for bursty data is grouped in the downstream node bandwidth resource;
The downstream network node receives above-mentioned smooth burst control grouping, by opto-electronic conversion, and in electric domain analysis, processing; Wherein, if the destination node address of above-mentioned smooth burst control grouping is this network node, then set up link or discharge link according to its packet type, notify this node in burst control grouping appointment time and wavelength on receive corresponding light bursty data grouping or discharge corresponding resource, be divided into original traffic packets, and send to respectively in separately the purpose subnet; If the destination node address of above-mentioned light burst control grouping is not this network node, be its reservation or release corresponding bandwidth resource then according to its packet type, and modification offset time, send to next node by control channel, and, configure adjustable OADM optical add/drop multiplexer module and make the grouping of light bursty data transparent through intermediate network node in the moment of light burst control grouping appointment;
Behind the offset time through light burst control specified in packets, directly on the wavelength of being reserved, send above-mentioned smooth bursty data grouping.
2, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network as claimed in claim 1, it is characterized in that:
Described smooth burst control grouping also comprises packet type, burst length and the wavelength identification information of corresponding light bursty data grouping.
3, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network as claimed in claim 2, it is characterized in that: if this network node data channel or control channel bandwidth resources are unavailable, then wait for, when available resources are arranged, by control channel above-mentioned smooth burst control grouping is sent, for the light bursty data is grouped in the downstream node bandwidth resource.
4, as avoiding the burst statistic multiplexing method of light signal conflict in one of them described optical-fiber network of claim 1 to 3, it is characterized in that: if the bandwidth resources that the light bursty data of the bandwidth resources that the discovery request is reserved and certain network node has been reserved clash, please remove this network node and be asked the bandwidth resources reserved by the light bursty data of conflict grouping, produce and send the light burst control grouping that discharges resource, packet type is for discharging link, generation avoids conflict, in electric territory the above-mentioned corresponding bursty data grouping of reserving with request of bandwidth resources is stored simultaneously, wait for when resource is idle and retransmitting.
5, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network as claimed in claim 4, it is characterized in that: described network node structure comprises: input/output module, service convergence module, Fast Adjustable OADM module, scheduler module, receiver module, sending module, control module and route switch module; Described input/output module is given subnet from subnet reception business datum or dateout; Classify and converge by assembling module, form the bursty data grouping; Scheduler module is carried out dispatching management according to available resource information, generates the burst control grouping of setting up link; After handling framing via control module again, carry out the electric light conversion then, and the burst control grouping is sent to downstream node by control channel; Behind certain offset time, under the control of scheduler module, configuration sending module and Fast Adjustable 0ADM module send this light bursty data and divide into groups to downstream node; When control module receives the grouping of light burst control on control channel, carry out opto-electronic conversion simultaneously, parse control information wherein; Be its corresponding light bursty data packet reservation or discharge resource, and constantly configure the adjustable optical add and drop multiplexer device specifying, allow light bursty data this network node of transparent process that divides into groups; If the destination address of this light burst control grouping is this network node, then in moment of its appointment, configure the adjustable optical add and drop multiplexer device, this light bursty data grouping demultiplexing from light path is got off, be sent to receiver module, the light bursty data that will receive in receiver module divides the assembling and dismantling frame, and is sent to route switch module, and these traffic packets are sent to separately subnet respectively; With two light bursty data groupings of upstream node there is if find this node when conflict, under the control of scheduler module,, produces and send the light burst control grouping that discharges link, discharge the corresponding bandwidth resource, in order to avoid resource contention by control module.
6, as avoiding the burst statistic multiplexing method of light signal conflict in one of them described optical-fiber network of claim 1 to 3, it is characterized in that: described smooth burst control be grouped in from source node to destination node each node of process, carry out the conversion of photoelectricity light, carry out resource reservation in electric territory; The intermediate node that described smooth bursty data is grouped between source node and the destination node does not carry out the photoelectricity optical processing, in the complete transparent transmission in light territory.
7, as avoiding the burst statistic multiplexing method of light signal conflict in one of them described optical-fiber network of claim 1 to 3, it is characterized in that: described ring topology network forms the annular section networking by two back-to-back light burst add-drop multiplexer nodes.
8, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network, be applicable to the ring topology network of unidirectional reservation, it is characterized in that, comprise the following steps:
Network node receives the traffic packets from subnet, forms the bursty data grouping according to purpose network node address and service classification information;
Produce the grouping of light burst control according to the bursty data grouping information, in the described smooth burst control grouping, comprise the offset time of setting;
The grouping of light burst control is sent by control channel, for the light bursty data is grouped in downstream node request bandwidth resource;
The downstream network node receives the grouping of light burst control, by opto-electronic conversion, and in electric domain analysis, processing;
Behind the offset time through light burst control specified in packets, allow the grouping of light bursty data, directly on the wavelength of reserving, send the grouping of light bursty data through the time-delay of the fibre delay line of a regular length.
9, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network as claimed in claim 8, it is characterized in that: if the destination node address of above-mentioned smooth burst control grouping is this network node, then notify this node in burst control grouping appointment time and wavelength on receive corresponding light bursty data grouping and tear it open frame, and send to respectively in separately the purpose subnet.
10, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network as claimed in claim 8, it is characterized in that: if the destination node address of above-mentioned smooth burst control grouping is not this network node, then reserve the corresponding bandwidth resource for it, and revise offset time information, send to next node by control channel; The moment in light burst control grouping appointment configures adjustable optical add and drop multiplexer device module, allows the grouping of light bursty data through the time-delay of the fibre delay line of a regular length, and is transparent in intermediate network node; Simultaneously so that its corresponding light burst control packet transaction and reserved resource take place effectively to avoid light bursty data packet collisions.
11, as avoiding the burst statistic multiplexing method of light signal conflict in claim 8, the 9 or 10 described optical-fiber networks, it is characterized in that: described network node, its structure comprises: input/output module, service convergence module, Fast Adjustable OADM module, scheduler module, receiver module, sending module, control module and route switch module; The fibre delay line that regular length is wherein arranged in the Fast Adjustable OADM module, described input/output module is given subnet from subnet reception business datum or dateout, is classified by the convergence module and converges, and forms the bursty data grouping; Carry out dispatching management by scheduler module according to available resource information, generate the burst control grouping; After handling framing via control module again, carry out the electric light conversion then, and the burst control grouping is sent to downstream node by control channel; Behind certain offset time, under the control of scheduler module, configuration sending module and Fast Adjustable OADM module are sent to downstream node with this light bursty data grouping; When control module receives the grouping of light burst control on control channel, carry out opto-electronic conversion simultaneously, parse control information wherein; When if the destination address of this light burst control grouping is not the address of this network node, it then is its corresponding light bursty data packet reservation resource, and specifying the moment to configure adjustable OADM, allow light bursty data grouping pass through fibre delay line, after postponing a set time, this network node of transparent process is so that its corresponding light burst control packet transaction and reserved resource effectively avoid conflict; When if the destination address of this light burst control grouping is the address of this network node, then in the moment of its appointment, configure adjustable OADM and other corresponding receiver module, the light bursty data that receives is divided into groups to route switch module; Again according to header and its corresponding burst control grouping information of this bursty data grouping, it is sent to separately subnet respectively.
12, avoid the burst statistic multiplexing method of light signal conflict in the optical-fiber network as claimed in claim 11, it is characterized in that: described smooth burst control grouping comprises following field: burst data length, offset time, destination address, service type, life span and Frame Check Sequence.
13, as avoiding the burst statistic multiplexing method of light signal conflict in claim 8, the 9 or 10 described optical-fiber networks, it is characterized in that: described smooth burst control be grouped in from source node to destination node each node of process, carry out the conversion of photoelectricity light, carry out resource reservation in electric territory; The intermediate node that described smooth bursty data is grouped between source node and the destination node does not carry out the photoelectricity optical processing, in the complete transparent transmission in light territory.
14, as avoiding the burst statistic multiplexing method of light signal conflict in claim 8, the 9 or 10 described optical-fiber networks, it is characterized in that: described ring topology network forms the annular section networking by two back-to-back light burst add-drop multiplexer nodes.
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| CN101150500B (en) * | 2006-09-18 | 2010-05-19 | 上海交通大学 | Method and system for solving channel competition |
| CN101212403B (en) * | 2006-12-27 | 2010-11-10 | 华为技术有限公司 | Method and node for implementing optical outburst switching loop network |
| CN101355491B (en) * | 2007-07-24 | 2012-03-21 | 华为技术有限公司 | Method for transmitting data and network element equipment |
| CN101145884B (en) * | 2007-10-17 | 2012-05-09 | 中兴通讯股份有限公司 | A judgement method for confliction detection in wave division multiplexing service |
| CN101557339B (en) * | 2008-04-09 | 2012-04-04 | 华为技术有限公司 | Data transmission method, data processing node and data transmission system |
| WO2012003890A1 (en) | 2010-07-09 | 2012-01-12 | Telefonaktiebolaget L M Ericsson (Publ) | Switching node with load balancing of bursts of packets |
| CN104348754B (en) * | 2013-07-26 | 2019-08-23 | 中兴通讯股份有限公司 | A kind of bandwidth allocation methods and device of optical burst ring net |
| CN104468406B (en) * | 2013-09-13 | 2019-10-22 | 中兴通讯股份有限公司 | Across host node method and device for business processing |
| US10225005B1 (en) * | 2018-03-09 | 2019-03-05 | Elbex Video Ltd. | Communication infrastructure devices and support tools for intelligent residences or businesses and communicating method with and operating intelligent electrical devices |
| CN112817891B (en) * | 2021-02-04 | 2022-10-18 | 联合微电子中心有限责任公司 | Programmable optical chip and terminal |
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