CN1595909A - Polling persisting multicast protocol based on retransmission acknowledgement mechanism in optical burst switching ring network - Google Patents
Polling persisting multicast protocol based on retransmission acknowledgement mechanism in optical burst switching ring network Download PDFInfo
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Abstract
The invention discloses a poll continuous multicast protocol based on repeating confirmation mechanism in light mutation exchange rig net. It supports reliable service, acquires the reliability through retransmitting and confirmation mechanism; the dispatcher processes the multicast queue with poll mode; when there has several data packet reaches the target joint, the target joint selects one to receive from the several data packet; if the joint can not receive the mutation packet to be signed, one or several joints in the multicast addresses does not receive the data packet transmitted from the source joint, the source joint retransmits the data packet, guarantees all the joints received the data. The method decreases the complexity of protocol, and the protocol is simplified through the smallest control.
Description
Technical field
The present invention relates to optical communication network, especially a kind of ring topology network that is applicable to, be used for optical outburst switching loop network based on retransmit affirmation mechanism multicast protocol--poll continues multicast protocol, belongs to fiber optic communication field.
Background technology
Along with the rapid growth of data service in the global range, the bandwidth and the exchange capacity that transmit net are had higher requirement.At present, the development of dense wave division multipurpose DWDM (Dense Wavelength DivisionMultiplexing) technology can provide the bandwidth up to Tbps, but the exchange rate of circuit-switched technology is well below this requirement.The light burst-switched is the half-way house of optical circuit exchange and light packet switching, and its exchange granularity falls between, and combines the advantage of the two, it is more flexible than circuit switching, the bandwidth availability ratio height than grouping exchange practicability, is up-and-coming a kind of smooth switching technology again.
The light burst-switched is proposed by Qiao Chunming and Turnor J.S. respectively, because its outstanding feature, it has caused more and more researchers' attention.In light burst-switched OBS (OpticalBurst Switching) network, the overlength IP bag that burst is made up of some IP bags, these IP bags can be from electric ip routers different in traditional IP network.The effect of control grouping BCP (BurstControl Packet) among the OBS is equivalent to the packets headers in the packet switching, separates the corresponding bursty data of each control grouping on physical channel with bursty data (net load).For example, in wave division multiplexing WDM (Wavelength Division Multiplexing) system, the control grouping takies one or several wavelength, and bursty data then takies other all wavelengths; In optical time division multiplexing system, the control grouping takies one or several channel; In optical fiber ribbon cable, the control grouping takies one or a few optical fiber.
The research to the light burst-switched at present mainly concentrates on grid network, because the flexibility of looped network, management are simply and survivability is good etc. that characteristics are subjected to generally paying attention to.Some scholars have proposed the access protocol of optical outburst switching loop network.
Multicast is that the one or more senders of a kind of permission (multicast source) send single packet to a plurality of recipients (once, simultaneously) technology.Multicast source sends to specific multicast group to packet, and the address that only belongs to this multicast group just can receive packet.Multicast can be saved the network bandwidth greatly, because no matter what destination addresses are arranged, can only transmit single packet on any link of whole network.It has improved the efficient that data transmit greatly, has reduced the possibility of network congestion.Multicast is widely used in fields such as the broadcast, video conference, remote teaching of Voice ﹠ Video.
Referring to Fig. 1: the light burst exchange network schematic diagram.The light burst-switched is made up of fringe node and core node, in OBS, all the time in the light territory, and control information all needs conversion and the electric treatment of O/E/O to bursty data at each node from the source node to the destination node, the speed of control channel and bursty data channels can be identical, also can be different.The OBS net is made up of with the edge router of electricity the core router of light, and similar with multi protocol label exchange MPLS net, different is that data message need not carry out O/E, E/O conversion in the OBS net.It is the light bursty data that the edge router of OBS net is responsible for the data encapsulation in traditional IP network, and reverse opening work.The task of core router is that the light bursty data is transmitted and exchanged.Each burst is made up of the IP bag with identical egress edge router address and same services quality Q oS (Quality of Service) requirement.Bursty data is the basic cross-over unit in the optical burst switched network.
Referring to Fig. 2: the structure chart of OBS net core node.Here suppose that its inlet, outlet fiber count are N, the number of wavelengths of every optical fiber is K.One of them wavelength transmission BCP, this wavelength at first will carry out the O/E conversion at each intermediate node, and then carries out processing procedures such as electric routing table lookup, switching matrix control, and final updating BCP also carries out the E/O conversion; All the other K-1 wavelength transmission bursty datas, these wavelength do not need the O/E/O conversion at each intermediate node, thereby have guaranteed the transparency of data.And in the light packet switching, in order to extract optical packet head, all must extract a part of light signal at each node to all wavelengths carries out the O/E/O conversion, thereby too complicated, and this light signal extracting mode also can have a strong impact on its regeneration distance.
Among Fig. 2, the effect of inlet fibre delay line FDL (Fiber Delay Line) is the buffer memory bursty data, waits grouping to be controlled to carry out the O/E conversion, transmit and search, set up exchange connection etc.Inlet FDL is essential in the light block exchange mode, but in OBS, set out by allowing BCP shift to an earlier date suitable a period of time T, be the time period that the bursty data reservation equates just, can make all intermediate nodes save inlet light buffer memory FDL than corresponding bursty data; Also can for the high long time off-set T of bursty data setting of priority, make it obtain bigger reservation chance of success, realize that the QoS of WDM layer guarantees by being different priority with traffic differentiation.
Summary of the invention
According to background technology, the present invention only relates to the light burst-switched based on WDM, propose a kind of be used for optical outburst switching loop network based on retransmit affirmation mechanism multicast protocol--poll continues multicast protocol, and it comprises the following steps:
(a) network node receives the traffic packets from Access Network, utilizes certain packing algorithm (as fixing built-up time algorithm, fixedly assembled length algorithm or self adaptation packing algorithm) will be assembled into bursty data from the traffic packets in the Access Network and divides into groups;
(b) transfer control frame on the control channel in loop network link, each frame structure is divided into N time slot, a node in the corresponding looped network of each time slot, node to one's name writes the essential information of burst packets in the time slot in control frame, these information comprise multicast address, burst packets length, offset time, successfully receive the interstitial content NNSRB (Node Number of Successfully receivedBurst) and the burst packets identifier BID (Burst Identifier) of burst packets;
(c) through the offset time of appointment in the control frame (Loop Round Trip Time of burst packets in looped network and the summation in processing time of all nodes), node directly sends above-mentioned smooth burst group on the fixing emission wavelength of each node;
(d) after node is received control frame on the control channel, check all time slots in the control frame, see whether the multicast address in the time slot has this node, if having, then utilize certain multicast protocol to receive burst packets, if not then burst packets is forwarded to next node.
Scheduler in the node adopts the mode of poll to serve to the burst packets in the multicast queue, when the multicast address of a plurality of time slots in the control frame is same node, receiver in the node receives one of them burst packets at random, all the other burst packets then can not be received, this agreement utilization re-transmission and affirmation mechanism retransmit burst packets, guarantee that all nodes can both receive burst packets in the multicast address.
By in the time slot of control frame, adding interstitial content NNSRB and the burst packets identifier BID that successfully receives burst packets, node in the multicast address successfully receives a burst packets, the NNSRB of this node time slot adds 1 in the control frame, after source node is got back in the control frame transmission, source node is by relatively NNSRB and the destination node number in its multicast address of burst packets identifier BID judge whether all nodes in the multicast address successfully receive burst packets, if equate, represent that then nodes all in the multicast address all successfully receives data, if it is unequal, then expression also has node not receive data, node also retransmits with this multicast address, all receives this burst packets up to all nodes.So just can prevent the repeatedly reception of a node to same multicast packet, we are referred to as to retransmit determine mechanism.
In each time slot of control frame, added burst packets identifier BID, burst packets identifier BID is the only resource that certain node is differentiated burst packets, when node produces a new burst packets, node distributes a burst packets discriminating digit according to ascending order for each burst packets, the burst packets identifier is checked according to ascending order, the burst packets identifier BID of the control frame of node by more just arriving node and the burst packets identifier BID that successfully received last time judge whether this burst packets receives, if promptly two identifiers are identical, represent that then this burst packets is successfully received by node already, node does not need to receive once more this burst packets, node just with this burst packets through to next node, if two identifier differences, the expression node does not receive source node and sends to its packet, this is the packet that source node is retransmitted, and node is received.
The present invention does not use centralized agreement, because need to collect the size of multicast queue in the centralized protocol, perhaps needs (for example based under the time division multiplexing mode) synchronously in the whole network.In light burst exchange network, burst packets length is a very important parameters.If the length of burst packets is less, then the burst packets number in the channel will become greatly, increase the processing burden of hardware, if burst packets length is long, will certainly increase network delay, so be provided with two parameters in the present invention: minimal burstiness packet length B
MinWith maximum burst packet length B
Max, burst packets length just can be sent out, and the length maximum of burst packets can not surpass the maximum burst packet length during only greater than the minimal burstiness packet length.
The present invention has the following advantages and effect:
1, the scheduler in the node of the present invention adopts polling mode to serve to the burst packets in the multicast queue, this method of service can make agreement fair, impartial more treat each burst packets in the multicast queue, and can reduce the complexity of agreement.
2, the present invention is because the simplicity of route in the looped network, thus the easier realization of multicast in looped network, and utilize minimum control that agreement is oversimplified, so that be applied to hardware system.
3, the multicast protocol that the present invention relates to is distributed, and each node all uses identical agreement like this, has promoted network extensibility.
4, the present invention is based on and retransmits affirmation mechanism, guaranteed that not only each node in the multicast address can both receive multicast packet, but also prevented a node to same burst packets repeat receive.
Description of drawings
Fig. 1 is the light burst exchange network schematic diagram.
Fig. 2 is a core node structure in the light burst exchange network.
Fig. 3 is the optical outburst switching loop network structure chart.
Fig. 4 is optical outburst switching loop network node structure figure.
Fig. 5 is the control frame form of optical outburst switching loop network.
Embodiment
The multicast protocol that the present invention proposes is applicable in the optical outburst switching loop shape topological network that network configuration is the structure chart of OBS looped network as shown in Figure 3.The OBS looped network contains N node, and what this N node was average is distributed on the ring, and N+1 wavelength arranged in the every light, and each node can connect a plurality of Access Networks, and one of them is as control channel, and all the other N are used as data channel, are used for transmitting bursty data.The emission wavelength of each node is all inequality, and promptly each node all has different emission wavelengths to launch packet, can eliminate the emission competition like this, improves the performance of light burst exchange network.In the OBS looped network, each node all serves as 3 kinds of roles: source node, intermediate node and destination node.When doing source node, node will be assembled into burst packets according to certain packing algorithm (as fixing built-up time algorithm, fixedly assembled length algorithm or self adaptation packing algorithm) from the IP of Access Network bag, be transmitted on the data channel; When doing intermediate node, with burst packets straight-through be sent to next node; When doing destination node, node receives the packet from source node, and burst packets separated is assembled into the IP bag and sends to the user.
Referring to Fig. 4, be the structure chart of node in the OBS looped network.Each node has an optical add/drop multiplexer OADM (Optical Add Drop Multiplexer) and two pairs of transceivers.Wherein a pair of be tuned on the wavelength of control channel, be used for receiving and sending controlling packet; Another is a fixed wave length to the transmitter in the transceiver, its wavelength is fixed on its emission wavelength, is used for sending packet, and receiver is a tunable receiver, can be fast be tuned to the emission wavelength of other node, receive the packet that other node is dealt into this node.In the OBS looped network, internodal communication is to finish by the control frame on the control channel.
Referring to Fig. 5, the schematic diagram of frame structure in the optical outburst switching loop network.In the OBS looped network, internodal communication is to finish by the control frame on the control channel, each frame structure is divided into N time slot, a node in the corresponding looped network of each time slot, the essential information that has comprised burst packets in the time slot: multicast address, burst packets length, offset time successfully receives the interstitial content NNSRB and the burst packets identifier BID of burst packets.
It is reliably professional that poll continues the multicast protocol support.Obtain reliability by re-transmission and affirmation mechanism.In polling protocol, can both receive data in order to guarantee all nodes in the multicast address, if any one node in the multicast address does not receive multicast packet, node must retransmit.Scheduler carries out poll services to the burst packets in the multicast queue.Operation to source node and destination node describes in detail below.
Source node:
Each node in the network receives the business of sending from each Access Network, destination node and information such as service type and multicast address according to the Access Network business, utilize certain packing algorithm (as fixing built-up time algorithm, fixedly assembled length algorithm or self adaptation packing algorithm) to form multicast data packet, and it is medium to be sent to deposit multicast queue in.Before sending, scheduler is chosen one more than or equal to the long burst packets of minimal burstiness bag in multicast queue.Node checks whether this node transmitter is available.If this moment, the node transmitter was unavailable, promptly the transmitter of node is sending other burst packets at this moment, and then node wait transmitter can be used.When the node transmitter can be with (i.e. this moment node do not launch burst packets), the arrival of the next control frame of scheduler waits at this moment, when a control frame arrived this node, the node writing information was in the one's own time slot of control frame.These information comprise multicast address, burst packets length, and offset time successfully receives the interstitial content NNSRB and the burst packets identifier BID of burst packets.Node sends burst packets after being offset time waiting for a period of time.NNSRB is an integer, and it is used to refer to destination node and whether successfully receives burst packets in the multicast, if a node has successfully received the multicast packet that source node is sent, then NNSRB adds 1.At first, all NNSRB are defaulted as 0.Burst packets ID is the only resource of certain node identification burst packets.When node produced a new burst packets, node was burst packets discriminating digit of each burst packets distribution according to ascending order.According to like this, the burst packets discriminating digit can be checked according to ascending order.
Node sends burst packets after waiting for offset time.Node is waited for the next control frame that contains same burst bag discriminating digit after sending burst packets.This stand-by period equals Loop Round Trip Time, and the summation in delivery time and processing time deducts offset time.After the control frame that contains same burst bag discriminating digit arrives this node, node is checked the numeral among the NNSRB in the control frame, (expression has node successfully not receive the burst packets of up-to-date transmission if the numeral among the NNSRB is different with the interstitial content in the multicast address, both differences are not for receiving the interstitial content of multicast packet), node uses identical multicast address to resend the burst packets of last time.Because each burst packets all has an independent BID, will no longer receive this burst packets so received the node of this burst packets last time, but with this burst packets straight-through be sent to next node; If a burst packets identifier BID who detects in the control frame is different with the BID of the burst packets that received last time, represent that then this node does not receive this burst packets, then node checks whether receiver is available, if receiver can be used, then node indication receiver receives this burst packets, and the NNSRB of this node time slot in the control frame is added 1, if receiver is unavailable, then node can not receive this burst packets, and node is not done any operation to the NNSRB of this node time slot in the control frame.
After control frame returned source node, numeral among the source node comparison NNSRB and the interstitial content in the multicast address were if the two equates that all nodes in the expression multicast address all successfully receive multicast packet, finish retransmission process.If unequal, then also will repeat retransmission process, all nodes in multicast address all receive burst packets.
After source node successfully sent to all destination nodes with multicast packet, source node discharged the internal memory in the buffer.Node with in the control frame to one's name time slot with sent the burst packets relevant information last time and remove.
Destination node:
When control frame arrived, node was checked the The whole control frame, and purpose is to check that the destination node whether burst packets is arranged is this node.This process is by checking whether this node is arranged in the multicast address.If this node is the destination node of some time slots, then whether the node inspection has received this burst packets (because this burst packets might be to retransmit).This process is to compare by burst packets discriminating digit that node last time was received and the burst packets discriminating digit in the control frame time slot to finish.If two numerals are identical, represent that then this node has received this burst packets, node is ignored this time slot, does not do any operation.Otherwise this time slot is for receiving the candidate.If have only one to receive the candidate in the control frame, node receives the burst packets of this time slot.If there are a plurality of reception candidates to exist, node is therefrom selected one arbitrarily and is received, and the NNSRB in the control frame is added 1, and expression has a destination node successfully to receive burst packets.If control frame does not receive the candidate, then node is not done any operation.
After a time slot was chosen, node checked whether burst packets arrives t moment back, back receiver available, and t has comprised the tuning period of tunable receiver during this period of time.If at this moment receiver can be used, then under the node indication OADM behind the corresponding wavelength in road receiver burst packets is received.If at this moment receiver is receiving other burst packets, then OADM does not descend the corresponding wavelength of this burst packets of road, NNSRB is not done any operation yet.Represent that this node does not receive the multicast packet that source node sends, source node also will be retransmitted this burst packets.
Claims (6)
1, continues multicast protocol based on the poll that retransmits affirmation mechanism in a kind of optical outburst switching loop network, comprise the following steps:
(a) network node receives the traffic packets from Access Network, utilizes certain packing algorithm will be assembled into the bursty data grouping from the traffic packets in the Access Network;
(b) transfer control frame on the control channel in loop network link, each frame structure is divided into N time slot, a node in the corresponding looped network of each time slot, node to one's name writes the essential information of burst packets in the time slot in control frame, these information comprise multicast address, burst packets length, offset time, successfully receive the interstitial content NNSRB and the burst packets identifier BID of burst packets;
(c) behind the offset time through appointment in the control frame, node directly sends above-mentioned smooth burst group on the emission wavelength that each node is fixed;
(d) after node is received control frame on the control channel, check all time slots in the control frame, see whether the multicast address in the time slot has this node, if having, then utilize certain multicast protocol to receive burst packets, if not then burst packets is forwarded to next node.
2, continue multicast protocol based on the poll that retransmits affirmation mechanism in the optical outburst switching loop network according to claim 1, it is characterized in that: the scheduler in the node adopts the mode of poll to serve to the burst packets in the multicast queue, when the multicast address of a plurality of time slots in the control frame is same node, receiver in the node receives one of them burst packets at random, all the other burst packets then can not be received, this agreement utilization re-transmission and affirmation mechanism retransmit burst packets, guarantee that all nodes can both receive burst packets in the multicast address.
3, continue multicast protocol based on the poll that retransmits affirmation mechanism in the optical outburst switching loop network according to claim 1, it is characterized in that: in the OBS looped network, set two constants: maximum burst packet length B
MaxWith minimal burstiness packet length B
Min, when stipulating burst packets length, just can be sent out only greater than the minimal burstiness packet length, the length maximum of burst packets can not surpass the maximum burst packet length.
4, continue multicast protocol based on the poll that retransmits affirmation mechanism in the optical outburst switching loop network according to claim 2, it is characterized in that: by in the time slot of control frame, adding interstitial content NNSRB and the burst packets identifier BID that successfully receives burst packets, node in the multicast address successfully receives a burst packets, the NNSRB of this node time slot adds 1 in the control frame, after source node is got back in the control frame transmission, source node is by relatively NNSRB and the destination node number in its multicast address of burst packets identifier BID judge whether all nodes in the multicast address successfully receive burst packets, if equate, represent that then nodes all in the multicast address all successfully receives data, if it is unequal, then expression also has node not receive data, node also retransmits with this multicast address, all receives this burst packets up to all nodes.
5, continue multicast protocol based on the poll that retransmits affirmation mechanism in the optical outburst switching loop network according to claim 4, it is characterized in that: in each time slot of control frame, added the interstitial content NNSRB that successfully receives burst packets, each node in the multicast address has successfully received the burst packets that source node sends, NNSRB just adds 1, compare the number of NNSRB and the interstitial content in this node multicast address, if these two numerals equate, show that then all nodes receive burst packets in the multicast address, if two numerals are unequal, then showing has one or more nodes not receive this burst packets, and the difference of the two is not for receiving the interstitial content of burst packets.
6, continue multicast protocol based on the poll that retransmits affirmation mechanism in the optical outburst switching loop network according to claim 4, it is characterized in that: in each time slot of control frame, added burst packets identifier BID, burst packets identifier BID is the only resource that certain node is differentiated burst packets, when node produces a new burst packets, node distributes a burst packets discriminating digit according to ascending order for each burst packets, the burst packets identifier is checked according to ascending order, the burst packets identifier BID of the control frame of node by more just arriving node and the burst packets identifier BID that successfully received last time judge whether this burst packets receives, if promptly two identifiers are identical, represent that then this burst packets is successfully received by node already, node does not need to receive once more this burst packets, node just with this burst packets through to next node, if two identifier differences, the expression node does not receive source node and sends to its packet, this is the packet that source node is retransmitted, and node is received.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007109937A1 (en) * | 2006-03-24 | 2007-10-04 | Shanghai Jiao Tong University | Resilient optical burst ring failure protecting method, apparatus and failure processing method |
| CN101459566B (en) * | 2007-12-14 | 2011-04-20 | 华为技术有限公司 | Timeslot scheduling method and network appliance for timeslot loop network |
| CN101273603B (en) * | 2005-09-27 | 2013-06-19 | 英特尔公司 | Mechanisms for data rate improvement in a wireless network |
| CN103270716A (en) * | 2010-12-01 | 2013-08-28 | 提琴存储器公司 | Reliable and fast method and system to broadcast data |
| CN104135357A (en) * | 2014-08-18 | 2014-11-05 | 中国电子科技集团公司第二十八研究所 | Short wave network polling transmission method based on duplex structure |
| CN105227913A (en) * | 2015-09-25 | 2016-01-06 | 厦门视诚科技有限公司 | A kind of processing method of cascade Mach-Zehnder interferometer order |
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| CN101273603B (en) * | 2005-09-27 | 2013-06-19 | 英特尔公司 | Mechanisms for data rate improvement in a wireless network |
| WO2007109937A1 (en) * | 2006-03-24 | 2007-10-04 | Shanghai Jiao Tong University | Resilient optical burst ring failure protecting method, apparatus and failure processing method |
| CN101459566B (en) * | 2007-12-14 | 2011-04-20 | 华为技术有限公司 | Timeslot scheduling method and network appliance for timeslot loop network |
| CN103270716A (en) * | 2010-12-01 | 2013-08-28 | 提琴存储器公司 | Reliable and fast method and system to broadcast data |
| CN103270716B (en) * | 2010-12-01 | 2017-11-14 | 提琴存储器公司 | Reliable quickly data broadcasting method and system |
| CN104135357A (en) * | 2014-08-18 | 2014-11-05 | 中国电子科技集团公司第二十八研究所 | Short wave network polling transmission method based on duplex structure |
| CN104135357B (en) * | 2014-08-18 | 2017-08-08 | 中国电子科技集团公司第二十八研究所 | A kind of short wave network poll transmission method based on duplex structure |
| CN110278196B (en) * | 2014-12-19 | 2022-02-25 | 意法半导体公司 | Multi-destination burst protocol |
| CN110278196A (en) * | 2014-12-19 | 2019-09-24 | 意法半导体公司 | Multi-destination burst protocol |
| CN105227913B (en) * | 2015-09-25 | 2018-12-28 | 厦门视诚科技有限公司 | A kind of processing method of cascade Mach-Zehnder interferometer order |
| CN105227913A (en) * | 2015-09-25 | 2016-01-06 | 厦门视诚科技有限公司 | A kind of processing method of cascade Mach-Zehnder interferometer order |
| CN106921550B (en) * | 2017-02-08 | 2019-09-17 | 广州广哈通信股份有限公司 | It can recognize the looped network signal transmission method of website sequence and quantity |
| CN106921550A (en) * | 2017-02-08 | 2017-07-04 | 广州广哈通信股份有限公司 | The looped network signal transmission method of recognizable website order and quantity |
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