CN1266867C - Optical burst switched network node structure with end-to-end reliability transmission function - Google Patents
Optical burst switched network node structure with end-to-end reliability transmission function Download PDFInfo
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Abstract
The present invention relates to an optical burst switching network node structure with the function of reliable end-to-end transmission. Edge nodes are added with a backup unit and a message generating unit; a sequence number is allocated to every burst group in the position of the edge nodes of an entrance, and every burst group is backed up until the successful delivery of every burst group is confirmed; a discarded message generating unit is added to middle nodes, and a source node is informed when the data burst groups are discarded so as to carry out retransmission; discard messages and confirming messages are introduced into control signalling; the source node is informed when the burst groups are discarded or successfully delivered so as to carry out retransmission or backup removal, and the messages and control groups together are transmitted in a control channel. The present invention can construct a self-adaptive and flexible core transmitting network; consequently, the probability of the occurrence of conflicts is decreased, the reliable transmission of optical burst groups in fields is ensured, and meanwhile, pressure at upper layers is mitigated so that the performance of the entire network is enhanced.
Description
Technical field
The present invention relates to a kind of light burst exchange network signaling control method with end-to-end reliable transmission function, realize the reliable transmission of light burst group in switching network, promote the performance of whole network, belong to the optical communication technique field, particularly the All-Optical Communication Network field.
Background technology
Light burst exchange network (OBS:Optical Burst-Switched Network) at first proposed and systematically discussed (Chunming Qiao by the C.Qiao of the New York State University in 1999, Myungsik Yoo.Optical burst switching (OBS)-a new paradigm for an optical internet.J.High Speed Network, 8:69-84,1999), the notion of this " classical light burst model " is once proposition, just become one of focus of optical communication field research very soon, because it makes under current optical tech condition, realize that the exchange and the transparent transmission of big grouping (Super Packet) becomes possibility.An OBS network (territory) is made of some edge routers and core router, and edge router (node) is responsible for finishing the interface with legacy network.At ingress edge node, according to the requirement of destination node and service quality, the IP grouping is assembled into burst group (Burst), and it is basic transmission and crosspoint in the OBS territory.Simultaneously, fringe node is created a burst control grouping for each burst group, and send prior to burst group a period of time, being called shift time (Offset Time) during this period of time again, the size of shift time has different regulations in the different signaling protocol of OBS.The control grouping is transmitted in different wavelength channels respectively with burst group, is called control channel and data channel.Control informations such as route are carried in the control grouping,, are responsible for burst group and preengage switching port in advance through light-electrical-optical (O-E-O) conversion and processing at intermediate node.In addition, the also responsible reconstruction control of intermediate node is divided into groups, is that burst group is set switching path and execution forwarding etc.On the outlet edge node of OBS territory, according to the information that the control grouping comprises, burst group is reduced to normal packets, continues to transmit in traditional IP network.
The light burst-switched can realize that data load can transparent transmission, enjoy the bandwidth resources of enriching that dense wave division multipurpose (DWDM:Dense Wavelength Division Multiplexing) technology brings to the full, simultaneously, compare with the light packet switching, the increase of exchange granularity has reduced the requirement to core switching node switching rate.Compare with light path exchange or wavelength route, unidirectional resource reservation and statistic multiplexing have improved bandwidth availability ratio again greatly.But owing to lack at present light random memory and practical complete tunable wavelength converter, it is distinct issues in the light burst-switched that the competition conflict solves (contention resolution).And in essence, the connectionless service that the nothing that classical light burst exchange network provides is confirmed, the same with IP, be based on " doing one's best " forwarding mechanism (best-effort), end-to-end reliable transmission can not be provided in the OBS territory.At present, end-to-end reliable transmission relies on transmission control protocol (TCP:TransmissionControl Protocol) to guarantee, but because burst group comprises a plurality of IP groupings, in case because conflict causes burst packet loss, a plurality of IP grouping lose the upper-layer protocol that can cause the multiple source client node, be TCP, carry out a series of repetitive operations such as re-assemblying of packet retransmissions present, OBS fringe node.The expense of bringing like this is very big, influences whole networks efficiency.
Summary of the invention
The objective of the invention is on classical light burst exchange network OBS model based, a kind of light burst exchange network signaling control method with end-to-end reliable transmission function is proposed, it is introduced the Flow Control (flowcontrol) of TCP and (retransmission) mechanism that retransmits among the OBS, thereby reduce the conflict odds from root, and the reliable transmission of assurance light burst group in the OBS territory, alleviate the pressure on upper strata simultaneously, promote the performance of whole network.
For realizing such purpose, the present invention transforms the light burst-switched model of classics, backup units and message generation unit have been increased at fringe node, distribute a sequence number at the ingress edge node place for each burst group, and by backup units each burst group is backed up, up to confirming that it is successfully sent to.Increased at intermediate node and to abandon message generation unit, the notification source node retransmits when the data burst grouping is dropped.Increased the control messages of feedback in the control signaling, comprised abandoning message and acknowledge message, the notification source node retransmits or removes backup when burst group is dropped or sends to smoothly, and these message are transmitted in control channel with the control grouping.
Main contents of the present invention comprise:
(1) in the control signaling, create " acknowledge message ".
Acknowledge message is responsible for generation by fringe node, its frame format comprises " type of message ", " destination address ", " exit address " and " sequence number " four territories (field), its type of message is " ack ", its coded system with abandon the grouping of message, burst control (BCP:Burst Control Packet) and other route, control information is distinguished.Acknowledge message is corresponding one by one with the burst group of sending to, and sequence number is the sequence number of the burst group of this acknowledge message correspondence; The destination node address that the acknowledge message that provides destination address mails to, just the ingress edge node address of corresponding burst group; Exit address is represented the outlet edge node address of corresponding burst group, that is the node address that sends of this message.
(2) in the control signaling, create " abandoning message ".
Abandon message and produced by intermediate node, its frame format comprises " type of message ", " destination address ", " source address ", " exit address " and " sequence number " five territories.Wherein, type of message is " drp ", and its coded system is distinguished with " acknowledge message ", burst control grouping and other route, control information.Destination address is to abandon the purpose fringe node address that message will mail to, that is the entry node addresses of the burst group that is dropped; Source address is to send the node address that abandons message, i.e. this intermediate node addresses, and fringe node can be understood the clogged conditions of whole network in view of the above; Exit address is the outlet edge node address that is dropped burst group, is used for distinguishing from same source node sending the burst group of going to different fringe nodes.Sequence number is the sequence number that is dropped burst group.
(3) new fringe node functional structure
The functional structure of fringe node of the present invention can be divided into reception and send two parts (so-called reception and transmission are all with respect to burst group) here.
Receiving unit is responsible for receiving information from core net, is forwarded to the traditional client net after the processing.It comprises plurality of units such as burst receiver module, opening (decomposition) module, grader, receiving scheduling device and electric cross matrix.Optical burst receiver carries out light-electricity conversion to the light burst group that receives, and delivers to the opening unit then; Seal off the unit and be responsible for the burst group decomposition-reduction is become ordinary groups stream, deliver to electric cross-connect matrix then; The electricity cross-connect matrix exchanges to the corresponding port with ordinary groups, enters the traditional client net; Grader is responsible for the information of control channel is carried out the conversion of light-electricity, and will control stream of packets and message flow is separated, and sends into the interior different processing unit of receiving scheduling device.The receiving scheduling device is the core of receiving unit, and except being responsible for coordinating the work of each module of control receiving unit, the forwards of also being responsible for simultaneously receiving is given the transmission scheduler that sends part.
Send part and be responsible for receiving grouping, pool burst group and mail to light burst-switched core net, be responsible for sending acknowledge message simultaneously and finish functions of retransmission from the traditional client net.It comprises two electric cross-connect matrixes, optical cross-connect matrix, the module units that happens suddenly, burst transmissions unit, control grouping (BCP) generation unit, backup units, message generation unit, an Optical Transmit Unit and sends scheduler etc., and wherein the generation of backup and message is newly-increased unit.First electric cross-connect matrix is responsible for the grouping that will arrive and is exchanged to corresponding burst module units according to the difference of destination node; The burst module units is assembled into a big data cell-burst group according to certain composition mechanism with some ordinary groups; The burst transmissions unit comprises a burst group transmit queue, and burst group is finished wavelength appointment, electricity-light conversion at this, becomes the light burst group, exchanges to the corresponding light output link through optical cross-connect matrix then, enters light burst-switched core net.Backup units is responsible for each burst group that assembles and necessary information are backed up; The BCP generation unit is responsible for each burst group and creates the control corresponding grouping; Message generation unit is responsible for creating relevant information, mainly is acknowledge message at fringe node.Message flow exchanges to corresponding Optical Transmit Unit with the control stream of packets through second electric cross-connect matrix, carries out the conversion of electricity-light, and imports in the control channel of corresponding optical fiber link and enter light burst-switched core net in the lump with corresponding data channel.Sending the most crucial unit of part is to send scheduler, and its function comprises following content:
Commander's burst module units carries out the burst group assembling according to certain composition mechanism;
Commander creates control and divides into groups, and sets shift time according to the requirement of control protocol, the emission of control control grouping and burst group;
Control all switching matrixs;
Message processing function;
(4) new intermediate node functionality structure
The functional structure of intermediate node has mainly comprised following functional module: an optical cross-connect matrix and an electric cross matrix, be responsible for the interconnection of data flow and control messages stream respectively; Dispatcher unit is responsible for coordinating, controlling each unit collaborative work; Control grouping regeneration unit, the relevant territory of being responsible for revising the control grouping such as life span territory TTL, and generates new control grouping; The light reflector element is responsible for finishing the opto-electronic conversion of control flows; Grader is responsible for control stream of packets and message flow are separated, and carries out different subsequent treatment.Because message flow not in intermediate node handles, therefore directly is sent to electric cross-connection unit, exchange to the corresponding port, continue to transmit; And the control stream of packets is sent to scheduler, handles and regenerates.Abandoning message generation unit is the distinctive unit of the present invention, abandons message generation unit and plays a role when having burst group to be dropped, and it generates one and abandon message under the control of scheduler, imports in the message flow and mails to next jumping.
Beneficial effect of the present invention:
(1) adopts light burst exchange network of the present invention, can reduce the conflict odds from root.Classical light burst model is based on unidirectional transfer mechanism, and fringe node is dressed up bigger burst group according to certain packaging strategy with the IP packet group that arrives and sent, and ignores the network condition of this moment at all.Like this, when network congestion is serious, can cause a large amount of burst group to be dropped.And light burst model of the present invention is based on the transfer mechanism of two-way tape feedback, when network has the generation of obstruction, fringe node can send according to the burst group of receiving that abandons message time-out corresponding port, thereby reduces the total load factor of network, reduces the generation of conflict.On network when unimpeded again, fringe node can receive acknowledge message or through one section random time after restart corresponding ports, continue to send burst.
(2) adopt light burst exchange network of the present invention, can significantly reduce the re-transmission pressure of TCP layer.In present and future network, the TCP/IP system all occupies absolute leading position.In classical light burst-switched model, the task of abandoning re-transmission is to be responsible for by the TCP layer fully.Because the burst group granularity is bigger, often may constitute from the IP grouping of different main frames by tens to tens, in case abandon, often need a plurality of main frames to retransmit.And adopt smooth burst-switched model of the present invention, and then can guarantee the end-to-end reliable transmission in the OBS territory of light burst group, thereby can reduce the pressure that the TCP layer retransmits greatly, improve the performance of whole network.
(3) adopt smooth burst-switched model of the present invention, can make up a self adaptation, the net of core transmission flexibly.Light burst exchange network has certain adaptive ability reliably, can both regulate automatically any business model and load, on the transmission opportunity of control burst group, reduces the generation of conflict.Generally acknowledged that now Packet Service has self similarity or is called the long-range correlation properties, the buffer memory capacity that increases switching node for this business simply is very limited to the improvement effect of blocking performance, has only the adaptive ability that improves network, could fundamentally improve network performance, strengthen the robustness of network self.
Description of drawings
Fig. 1 light burst exchange network schematic diagram with end-to-end reliable transmission function of the present invention.
Fig. 2 light burst exchange network fringe node of the present invention functional block diagram.
Fig. 3 fringe node abandons the Message Processing flow process.
Fig. 4 fringe node acknowledge message handling process.
Fig. 5 light burst exchange network intermediate node functionality of the present invention module map.
Embodiment
Light burst exchange network signaling control method with end-to-end reliable transmission function of the present invention relates to two class network nodes: fringe node and intermediate node are described in detail below in conjunction with the embodiment of accompanying drawing to technical solution of the present invention:
One, makes up fringe node
The functional structure of fringe node of the present invention as shown in Figure 2, it comprises and receives and send two parts.
Receiving unit is responsible for receiving information from core net, is forwarded to the traditional client net after the processing.It comprises plurality of units such as burst receiver module, opening (decomposition) module, grader, receiving scheduling device and electric cross matrix.Optical burst receiver carries out light-electricity conversion to the light burst group that receives, and delivers to the opening unit then; Seal off the unit and be responsible for the burst group decomposition-reduction is become ordinary groups stream, deliver to electric cross-connect matrix then; The electricity cross-connect matrix exchanges to the corresponding port with ordinary groups, enters the traditional client net; Grader is responsible for the information of control channel is carried out the conversion of light-electricity, and will control stream of packets and message flow is separated, and sends into the interior different processing unit of receiving scheduling device.The receiving scheduling device is the core of receiving unit, is responsible for coordinating the work of each module of control receiving unit, and the forwards of being responsible for simultaneously receiving is given the transmission scheduler that sends part.
Send part and be responsible for receiving grouping, pool burst group and mail to light burst-switched core net, be responsible for sending acknowledge message simultaneously and finish functions of retransmission from the traditional client net.It comprises two electric cross-connect matrixes, optical cross-connect matrix, the module units that happens suddenly, burst transmissions unit, control grouping (BCP) generation unit, backup units, message generation unit, an Optical Transmit Unit and sends scheduler etc., and wherein the generation of backup and message is newly-increased unit.First electric cross-connect matrix is responsible for the grouping that will arrive and is exchanged to corresponding burst module units according to the difference of destination node; The burst module units is assembled into a big data cell-burst group according to certain composition mechanism with some ordinary groups; The burst transmissions unit comprises a burst group transmit queue, and burst group is finished wavelength appointment, electricity-light conversion at this, becomes the light burst group, exchanges to the corresponding light output link through optical cross-connect matrix then, enters light burst-switched core net.Backup units is responsible for each burst group that assembles and necessary information are backed up; The BCP generation unit is responsible for each burst group and creates the control corresponding grouping; Message generation unit is responsible for creating relevant information, mainly is acknowledge message at fringe node.Message flow exchanges to corresponding Optical Transmit Unit with the control stream of packets through second electric cross-connect matrix, carries out the conversion of electricity-light, and imports in the control channel of corresponding optical fiber link and enter light burst-switched core net in the lump with corresponding data channel.Sending the most crucial unit of part is to send scheduler, and its function comprises following content: commander's burst module units carries out the burst group assembling according to certain composition mechanism; Each burst group that assembles is backed up in backup units; Commander creates control and divides into groups, and sets shift time according to the requirement of control protocol, the emission of control control grouping and burst group; Control all switching matrixs; Message processing function; Commander's generation " acknowledge message " etc.
The workflow of fringe node is such:
The burst group decomposition-reduction that receiving unit is responsible for receiving is an ordinary groups, is sent to the traditional client net and continues to transmit; Notice sends part and successfully receives a burst group simultaneously.In addition, other message of receiving (confirm and abandon message) is passed on to the transmission part, to retransmit and to remove backup.On data channel, optical burst receiver carries out light-electricity conversion with the burst group stream of receiving, delivers to the opening unit then and carry out decomposition-reduction under the control of scheduler, becomes ordinary groups; Stream of packets exchanges to the corresponding port via electric cross-connect matrix and enters traditional client net continuation forwarding; On control channel, grader is separated message flow and control stream of packets, is sent to the different processing units of scheduler; The receiving scheduling device is commanded the decomposition of burst group and the configuration of electric cross-connect matrix according to the result of control packet transaction.Simultaneously, the receiving scheduling device is given the forwards of receiving and is sent scheduler, to retransmit or to remove the work of backup.
Send the responsible ordinary groups that the traditional client net is sent here of part and be assembled into burst group, be sent to light burst-switched core net then; Simultaneously, generate the control corresponding grouping and enter light burst-switched core net along control channel with relevant message.On data channel, first electric cross-connect matrix exchanges to the ordinary groups of receiving in the assembling formation of corresponding burst module units, the there be assembled into burst group according to certain composition mechanism, and be sent to the burst reflector element transmit queue medium to be launched; Simultaneously, each burst group that assembles backs up in backup units, in order to retransmitting; When the transmission scheduler indicates certain burst group to retransmit, backup units is then taken out a copy of this burst group from archive memory, join in the transmit queue and go, simultaneously the BCP generation unit is sent in relevant control information, create new control grouping for retransmitting burst group.The state of transmit queue is controlled according to relevant controlling agreement or feedback message by scheduler, and the burst group of sending exchanges to the corresponding port via optical cross-connect matrix and enters light burst-switched core net.On control channel, BCP generation unit and message generation unit are the sources of control information flow, and flow through electric cross-connect matrix and Optical Transmit Unit of control information enters control channel, enters light burst-switched core net with corresponding data channel.All these carry out under the control that sends scheduler without any confusion.
Receive one when abandoning message when scheduler, the burst that at first suspends corresponding port burst transmitting element sends, promptly set the burst transmit status for " forbidding sending " (Send==0); A copy of then indicating backup units will be dropped burst group is sent to the burst transmitting element, joins in the middle of the transmit queue; Simultaneously, checking whether the burst group that is dropped is last that just sent out, if after then waiting for one section random time, be " allowing transmission (Send==1) " with the recovering state of transmitting element.If not, show the burst group that has follow-up port from then on to send in the burst group back that is dropped, then keep the transmit status of forbidding of transmit queue, up to the affirmation message of receiving this port, the burst that recovers formation sends; Perhaps just sent out last burst group of walking and also announced to abandon, then sent (referring to accompanying drawing 3) through one section follow-up supervention of random time equally.When the transmission scheduler is received an acknowledge message, at first check the transmit status of formation, if " allowing to send " then keeps; If " forbidding sending " then reverts to " allowing to send ", indicate backup units to remove the backup of corresponding burst group (referring to accompanying drawing 4) simultaneously.Be received scheduler and informed that a burst group is successfully received when sending scheduler, it will command message generation unit to create an acknowledge message, mail to the ingress edge node of this burst group along control channel with the control grouping after compound.
Two, make up intermediate node
The functional structure of intermediate node has mainly comprised following functional module as shown in Figure 5: an optical cross-connect matrix and an electric cross matrix, be responsible for the interconnection of data flow and control messages stream respectively; Dispatcher unit is responsible for coordinating, controlling each unit collaborative work; Control grouping regeneration unit is responsible for revising control and is responsible for relevant territory, such as life span territory TTL, and generates new control grouping; The light reflector element is responsible for finishing the opto-electronic conversion of control flows; Grader is responsible for control stream of packets and message flow are separated, and carries out different subsequent treatment.Because message flow not in intermediate node handles, therefore directly is sent to electric cross-connection unit, exchange to the corresponding port, continue to transmit; And the control stream of packets is sent to scheduler, handles and regenerates.Abandoning message generation unit is the distinctive unit of the present invention, abandons message generation unit and plays a role when having burst group to be dropped, and it generates one and abandon message under the control of scheduler, imports in the message flow and mails to next jumping.
The workflow of intermediate node wants much simple with respect to fringe node, and this also meets the trend of complexity being pushed to network edge.At first on data channel, the burst group of coming from data channel flows directly through optical cross-connect matrix, is forwarded to the corresponding output end mouth by the switching path that presets.And at first distinguished through grader from the control messages stream that control channel comes, if message flow then directly is sent to electric cross-connect matrix to transmit; If control grouping, then be sent to scheduler and handle and regenerate; After scheduler is received after the control packet transaction, for the burst group that is about to arrive is carried out the setting of switching path and the appointment of output port, if available resources (output wavelength channel, fibre delay line etc.) are arranged, then set the corresponding actions of optical cross-connect matrix at the burst group due in, revise the control grouping territory relevant then with jumping figure, generate new control grouping by control grouping regeneration module, continue to transmit through electric cross-connect matrix to corresponding output end mouth; If there are not available resources, then announce to abandon this burst group and control grouping, and notice abandons message generation unit and generates one and abandon message, import then in the message flow and together send.
Three, make up light burst exchange network with end-to-end reliable transmission function
Some fringe nodes and intermediate node couple together by the wave division multiplexing WDM link just can constitute a light burst exchange network, as shown in Figure 1.Edge router (node) is placed on the edge of light burst exchange network, is responsible for the interface with legacy network; Core router (intermediate node) is placed in the middle of the network, couples together by the WDM optical fiber link between them.Fringe node is responsible for the ordinary groups stream of legacy network is assembled into the bigger burst flow of granularity, is responsible for opposite process simultaneously, is about to light burst group flow point that light burst-switched core net transmits and separates and be reduced to ordinary groups, gives legacy network and continues to transmit.Burst group stream transmits along the data channel of optical fiber link, and control stream of packets and feedback message stream transmit along control channel, their carrier wavelength difference.With the data transmit-receive between two ip router S shown in Fig. 1 and the D is that example describes.The stream of packets of being sent by router S at first is assembled into burst group at edge router E1 place; Before burst group is issued, at first generate a control grouping, it carries the routing iinformation of this burst group and sends along control channel prior to the one field offset time of burst group, and burst group is sent along data channel subsequently.Each node place was through processed after the opto-electronic conversion after control was grouped in, be the burst group reservation output port that arrives soon after, after necessary modifications has been done in some territory, after electricity-light conversion, continue to pass then toward next hop node, up to egress edge router E2 along control channel.E2 is responsible for the data burst packet decomposition is reduced to ordinary groups, is forwarded to the purpose ip router D that is attached thereto.(reason that abandons may be because the available resources deficiency when intermediate node is dropped as burst group, or because control is divided into groups and the corresponding relation of burst group goes wrong), intermediate node is responsible for producing one and is abandoned message (grouping), and mails to corresponding ingress edge node.In Fig. 1, when intermediate node C2 abandoned a burst group, it can produce one and abandon message and mail to corresponding ingress edge node E1, the sequence number of the burst group that report is dropped; After fringe node E1 was notified, a copy that can take out this burst from backup units joined in the transmit queue, retransmits.After the outlet edge node is received a burst group like clockwork, continue the forwarding except it being decomposed into ordinary groups, simultaneously, it will produce " acknowledge message " (grouping) and mail to ingress edge node, notify its certain burst group successfully to receive; After ingress edge node is received this message, then in backup space, this burst group is removed.In view of the above, light burst exchange network of the present invention can guarantee burst group end-to-end reliable transmission in the OBS territory.
Claims (1)
1, a kind of light burst exchange network signaling control method with end-to-end reliable transmission function, it is characterized in that in the control signaling, having increased acknowledge message and having abandoned message, backup units and message generation unit in fringe node, have been increased, in intermediate node, increased and abandoned message generation unit, distribute a sequence number at the ingress edge node place for each burst group, and back up by backup units; After the outlet edge node is received a burst group like clockwork, produce an acknowledge message by message generation unit and mail to ingress edge node, ingress edge node is then removed this burst group in backup units; As burst group when intermediate node is dropped, the message generation unit that abandons of intermediate node produces one and abandons message and mail to corresponding ingress edge node, the burst of time-out corresponding port earlier sent after this ingress edge node was received and abandoned message, take out the backup be dropped burst group from backup units simultaneously and join in the middle of the transmit queue, up to receive new affirmation message or through one section random time after restart transmission; The receiving scheduling device of fringe node links to each other with the transmission scheduler, and the receiving scheduling device is coordinated the work of each module of control receiving unit except being responsible for, and is responsible for also receiving that the forwards of burst group is to sending scheduler.
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