CN100561980C - Support the switching method and the node structure of burst packet and IP grouping - Google Patents
Support the switching method and the node structure of burst packet and IP grouping Download PDFInfo
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Abstract
The invention provides a kind of full switch method and node structure of supporting burst packet/two kinds of granularities of IP grouping.Its adopts with electric buffer memory and replaces being difficult at present the light buffer memory realized, utilize the characteristic of " doing one's best " transmission of IP, the IP grouping that the IP grouping of transmitting between the electricity consumption buffer storage adjacent node and/or some qos requirements are low will be transmitted in the space that be inserted between these IP groupings as much as possible between the burst packet according to the information of burst control bag reservation Internet resources.Be that the IP grouping is passed through the OBS node as hourglass, what burst packet was then transparent transmits in the light territory.This method can effectively reduce the quantity of the burst packet in the network, utilizes electric random asccess memory that data are evenly distributed on wavelength channel.It can not only provide statistic multiplexing ability efficiently, and can reduce the blocking rate and the data loss rate of network greatly, and realizes simple.
Description
Technical field
The present invention relates to all optical communication technical field, particularly support the full switch method and the node structure of multiple granularity.
Background technology
In recent years, along with developing rapidly of Internet, and people make technology such as Network Transmission, exchange be faced with formidable challenges to the demand of multimedia messages.How to satisfy this growing bandwidth demand effectively and become one of major subjects of network research.Wavelength division multiplexing (WDM) technology reaches tens to hundreds of bits per second too for optical fiber communication provides the transmission bandwidth of magnanimity, up to a hundred wavelength channels of a bearing optical fiber, transmission bandwidth.And the core router that uses at present receives high-speed optical signal, through light/electricity conversion back parallel processing, is multiplexed to high-speed optical signal and transmits forward through electricity/light conversion again.Transmit in order to keep the linear speed bag, core router not only needs a large amount of light/electricity/optical switching equipment and a large amount of parallel processings, and need carry out a large amount of multiplexing, demultiplexing.Because the disposal ability and the exchange velocity of the intrinsic property of electronics restriction Switching Module.The development of current electron exchange and Information Processing Network is near the limit of electronics speed, drawbacks limit such as its intrinsic RC parameter, time jitter, drift, cross-talk, response speed the raising of exchange rate, Here it is " electronic bottleneck ".Because the existence of " electronic bottleneck ", exchange rate is subjected to the restriction of core router backboard speed, and complex structure, the cost costliness.The method that overcomes " electronic bottleneck " is directly to carry out full light exchange.
Full light switching technology is meant without any light/electricity and electricity/light conversion, directly with the different output ports of input optical signal exchanges data to router.Full light switching technology in the research mainly contains: optical circuit exchange (Optical Circuit Switching, OCS), the light burst-switched (Optical BurstSwitching, OBS) and the light packet switching (Optical Packet Switching, OPS).Existing researcher is three kinds of light switching technologies relatively, and wherein the light burst-switched has obtained good balance between optical circuit exchange and light packet switching.It combines the advantage of light and electricity, characteristics such as its exchange granularity is moderate, can not rely on the light buffer memory, realize easily, bandwidth availability ratio height can adapt to Network and increase and professional multifarious requirement, swap time, the different mining according to granularity realized with nanosecond or microsecond level optical device, can statistic multiplexing optical network band width resource.
The light burst-switched is a kind of full light exchange of sub-wavelength granularity, by user data is packaged into burst packet (in the 10Gbps following duration of speed from the hundreds of microsecond to a few tens of milliseconds) transmission of certain-length according to certain assemblage method.This processing speed and optical switch rate request to electronic device reduces greatly.Simultaneously because the burst packet of light burst-switched is the ultra-long data bag, the burst control bag is little more a lot of than the grouping number of light packet switching, light/electricity and electricity/light conversion much less that control information need be carried out at the OBS node, data read-write operation is few, thereby is easier to realize than light packet switching.Compare with OPS, the requirement of OBS sun adjuster spare is lower, the less-restrictive that is subjected to; Compare with OCS, OBS has the statistic multiplexing ability of higher degree, more is adapted to sudden strong Internet business.
The core concept of OBS technology is: reduce significantly as possible optical-fiber network the exchange granularity, statistic multiplexing ability efficiently is provided, take into full account the restriction of optical device simultaneously, reduce the requirement of sun adjuster spare.In the OBS network, the duration that the branch of resource is equipped with burst packet is basic granularity, and this makes the optical switch speed of OBS node to reduce greatly.But when two or more burst packet require from certain OBS node same port, same wavelength, competition has appearred when sending simultaneously.Because the current light random asccess memory (ORAM) that also is not similar to electric random asccess memory (RAM), this makes the ability of OBS node processing bursty data packet conflict be subjected to great restriction.The technology of the solution competition of being studied at present has: use fibre delay line (FDLs) to realize a little light buffer memory at input burst packet place, burst packet is penetrated route, wavelength Conversion and bursty data partially cut apart etc.These technology all are when burst packet is competed, and wherein certain or some bursty datas are wrapped in the OBS intranodal turn to another wavelength, port or optical fiber.They can avoid the conflict at current time OBS node place, but will cause new competition with bigger probability.Simultaneously, adopt fibre delay line to realize that a little light buffer memory can not effectively solve the race problem under the high load condition.Penetrate route partially and realize easily, but be subjected to network size and connective restriction thereof, unfavorablely provide desirable network performance.Wavelength Conversion can reduce average delay and reduce data loss rate, but the long converter technique of all-wave that is that all right is ripe, part wavelength conversion price comparison costliness when offered load is higher, uses part wavelength transfer pair network performance to improve limited.Bursty data is cut apart can reduce data loss rate, but has increased the realization difficulty of light burst exchange network.In order to manage conflict, also need in the control module of OBS node, adopt complicated exchange dispatching algorithm and conflict-solving strategy simultaneously, simultaneously buffer memory capacity that also must well-designed convergence module with converge algorithm.This will increase the realization complexity of node.
How all-optical network is an important research project at need being optimized the exchanged form of its intra-node and resource distribution mode of Network.Promptly study a kind of full switch method and network node structure of supporting multiple granularity, and have simple, the economic node structure of realization, remain a hot issue that is worth research.
Summary of the invention
At the above-mentioned analysis that current full light was exchanged and solved the method for competing between the data, the purpose of this invention is to provide a kind of new switching method that is used for all-optical communication network, statistic multiplexing ability efficiently is provided as possible, takes into full account the restriction of optical device simultaneously, reduce the requirement of sun adjuster spare.
Technical scheme of the present invention is as follows:
A kind of all optical communication switching method of supporting burst packet and IP grouping comprises:
Behind the data arrival OBS node from the legacy network interface, with destination address is that the data of adjacent node and data that destination address is distant-end node are classified, and the data of transmission pool bursty data and wrap on the OBS link and transmit between the distant-end node (if source, destination node to be not to be called distant-end node mutually by OBS link such node that directly links to each other).The free time that is filled in the bursty data parlor for the The data IP grouping of transmission between the adjacent node (if source, destination node to for by the link-attached node of OBS, such node is called adjacent node mutually) transmits in the gap.
After above-mentioned IP grouped data and burst packet enter the transmission buffer memory of OBS node, OBS node at first reserved resource is given the burst packet of passing by on one's way, reservation situation according to local resource, arrange the set out on a journey burst packet of distant-end node of sending node again, utilize the set out on a journey free time gap of wavelength channel of this node to send the IP grouped data simultaneously.
For the low data of the qos requirement between the distant-end node, although these data are to transmit between distant-end node, can not converge yet, adopt the IP grouping to be filled in the gap of burst packet and transmit.
A kind of node of supporting burst packet and IP packet switching mainly is made of professional grader, this ground/following road module and full optical switch module, and this ground/following road module comprises and converges/separate convergence module and the IP transmission/receiver module that divides into groups.Wherein, professional grader, being used for destination address is that the data of adjacent node and data that destination address is distant-end node are classified, the convergence that transmits between the distant-end node becomes bursty data to wrap on the light burst-switched link to transmit, the free time that the The data IP that transmits between adjacent node grouping is filled in the bursty data parlor transmits in the gap, converge/separate convergence module and convergence is become burst packet when being used to send data, carry out when receiving data and separate aggregation feature; IP grouping transmission/receiver module is used for IP transmission of packet data and reception.Be used for burst packet, the IP grouping of being set out on a journey in this locality and the burst packet of passing by on one's way exchanges to corresponding output wavelength according to wavelength resource reservation situation based on the full optical switch module of electric control.
The OBS node is stored in the IP grouping and the burst packet of setting out on a journey in the local electric random asccess memory, by a TS (Traffic Spacing) scheduler circuit-switched data on these is dispatched.
Further comprise professional grader the data between the distant-end node are classified according to qos requirement, the high data of qos requirement that are about to destination address and are distant-end node enter into and converge/separate convergence module; Destination address is that the low data of qos requirement enter into IP grouping transmission/receiver module.
The switching method of described support burst packet and IP grouping comprises two-layer content: at first be data set bag aspect, the data of transmitting between the adjacent node do not converge the composition burst packet, directly are grouped on the OBS link with IP and transmit; Transfer of data between the distant-end node can be treated respectively according to qos requirement, need pool bursty data to the high data of qos requirement wraps on the OBS link and transmits, and can not converge the composition burst packet to the low data of qos requirement, directly be grouped on the OBS link and transmit with IP.Next is to send the data aspect, the OBS node is stored in the IP grouping and the local data of setting out on a journey (comprising burst packet and IP grouping) of passing by on one's way in the electric random asccess memory of node, by the TS scheduler data that are stored in the local electric random asccess memory is dispatched; OBS node processing control information bag is reserved wavelength resource and is given the burst packet of passing by on one's way, reservation situation according to local resource, arrange the set out on a journey burst packet of distant-end node of sending node again, utilize the set out on a journey free time gap of wavelength channel of this node to send the IP grouped data simultaneously.
The switching method of the support burst packet that the present invention proposes/IP grouping utilizes the IP grouping to fill the space of bursty data parlor, not only reduced the quantity of the burst packet in the network, and can utilize electric random asccess memory that data are evenly distributed on wavelength channel, statistic multiplexing ability efficiently can not only be provided, and can reduce the blocking rate and the data loss rate of network greatly.At this moment, the OBS node needs polygamy to put outside some electric random asccess memory, does not need additionally to increase device, and realizes simple.
Description of drawings
Fig. 1 is the switching node structure simplified diagram of support burst packet of the present invention and IP grouping.
Fig. 2 is the schematic diagram of the full switch method of support burst packets of the present invention/IP grouping.
Fig. 3 is that switching node of the present invention sends schematic diagram data.
Fig. 4 utilizes the gap between the burst packet to send the schematic diagram that IP divides into groups.
Fig. 5 is the wire network topological diagram that four nodes are formed.
Fig. 6 is switching method and the resulting network topology packet loss performance shown in Figure 5 of switching node structure simulation according to two kinds of granularities of support burst packet of the present invention and IP grouping.
Wherein:
1---light wavelength division multiplexing 2---light wave decomposition multiplex device
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing, but the scope that does not limit the present invention in any way.
The node structure schematic diagram of the switching method of the support burst packet that the present invention proposes/IP grouping as shown in Figure 1.Diagram OBS node is regardless of edge and core two parts, it by professional grader, control module, converge/separate convergence module, IP grouping transmissions/receiver module, data storage, TS scheduler, light transmission/receiver module, optical switch module, light wavelength division multiplexing/demodulation multiplexer etc. are formed entirely.
When not considering the low data of qos requirement with the IP transmitted in packets, behind the data arrival OBS node from the legacy network interface, at first pass through professional grader, professional grader is that the data of adjacent node and data that destination address is distant-end node are classified with destination address, wherein destination address is that the data of distant-end node enter into and converge/separate convergence module, then according to certain encapsulation algorithm encapsulation burst packet; Destination address is that the data of adjacent node enter into IP grouping transmission/receiver module.Burst packet of setting out on a journey in this locality and IP packet memory are in the electric random asccess memory of node, by the TS scheduler last circuit-switched data is dispatched, give the burst packet of passing by on one's way according to the preferential reserved resource of node shown in Figure 4, after satisfying the burst packet reserve resource request of passing by on one's way as far as possible, according to the local resource situation, arrange the set out on a journey burst packet of distant-end node of sending node again, utilize the set out on a journey free time gap of wavelength channel of this node to send the IP grouped data simultaneously.Enter full optical switch module after data send through optical transmission module and enter link through wavelength division multiplexer.When receiving data, from the data of link at first through behind the light wave decomposition multiplex device by full optical switch module according to destination address with exchanges data to corresponding output port.Wherein destination address is buffered in the electrical storage after being received by Optical Receivers for the data of this node, send into respectively through the control module scheduling again and converge/separate convergence module and IP grouping transmission/receiver module, arrive the destination by professional grader classification through the legacy network interface at last; Destination address for the data of other nodes then after full optical switch module exchanges to output port, enter next jumping chain road direction destination transparent transmission through light wavelength division multiplexing.
A kind of switching node of two kinds of granularities of burst packet/IP grouping of supporting that the present invention proposes sends schematic diagram data as shown in Figure 3.Behind the data arrival node from legacy network (as Ethernet, IP, ATM, SDH network), need through professional grader according to destination address the data separate processes, wherein destination address is that the data of distant-end node enter transmit buffer after converging adaptation module encapsulation, and destination address to be the data of adjacent node directly enter transmit buffer.According to local resource reservation situation the data in the transmit buffer are sent scheduling by the TS scheduler, the burst packet that is scheduled or IP grouping enters full optical switch module after the electric light conversion, according to routing iinformation be switched to output port after wavelength division multiplexer to enter link defeated to next jump set.What the burst packet of passing by on one's way was then transparent transmits in the light territory.
In the switching node structure Design of two kinds of granularities supporting burst packet/IP grouping, professional grader, converge/separate convergence module, control module, the circuit-switched data of setting out on a journey down memory, TS scheduler, light transmission/receiver module, the full optical switch module that high-speed light is opened the light and constituted, light wavelength division multiplexing/light wave decomposition multiplex device etc. are basic device and the modules that makes up node.As an example, select these basic device and modules of enumerating among the present invention for use, the switching method according to support burst packets shown in Figure 2/IP grouping can constitute switching node as shown in Figure 1.By means of OPNET
TMSimulation software according to node structure and the switching method that the present invention proposes, has set up 4 node optical burst exchange networks as shown in Figure 5.Fig. 6 is resulting this network packet loss rate performance of emulation.Each node in the network has four legacy network interfaces to inject data to network, supposes that simultaneously these interfaces are connected with a large amount of independently Poisson traffic source.The group bag algorithm at node place is a time span product threshold algorithm, and threshold value is 9 megabit milliseconds (Mbms).Routing Protocol adopts static routing resource shown in Figure 5, and Wavelength assignment algorithm adopts adaptive at first (first fit) algorithm.
Curve among Fig. 6 all is JET (the Just Enough Time) resource reservation protocol that adopts, the curve representation node place that indicates " no IP bag plug hole " among the figure all converges all data and is assembled into the transmission of burst number bag, does not adopt the IP grouping to fill the space of bursty data parlor; The curve representation node place that indicates " IP bag plug hole is arranged " among the figure carries out the space transmission that the bursty data parlor is filled in the IP grouping to the data between adjacent node.As can be seen from Figure 6, the average data Loss Rate of " have IP bag plug hole " curve ratio " no IP wraps plug hole " curve representation will hang down about 50%.
More than be embodiments of the present invention, according to content disclosed by the invention, those of ordinary skill in the art can identical, the replacement scheme of conspicuous some that expect, all should fall into the scope of protection of the invention.
Claims (6)
1, a kind of all optical communication switching method of supporting burst packet and IP grouping, comprise: after the data arrival light burst switching nodes from the legacy network interface, with destination address is that the data of adjacent node and data that destination address is distant-end node are classified, the convergence that transmits between the distant-end node becomes bursty data to wrap on the light burst-switched link to transmit, and the free time that the The data IP grouping of transmitting between the adjacent node is filled in the bursty data parlor transmits in the gap.
2, all optical communication switching method of support burst packet as claimed in claim 1 and IP grouping, it is characterized in that: light burst switching nodes at first reserved resource is given the burst packet of passing by on one's way, reservation situation according to local resource, arrange the set out on a journey burst packet of distant-end node of sending node again, utilize the set out on a journey free time gap of wavelength channel of this node to send the above-mentioned IP grouped data simultaneously.
3, all optical communication switching method of support burst packet as claimed in claim 1 or 2 and IP grouping, it is characterized in that: the data low to the qos requirement between the distant-end node do not converge, and adopt the IP grouping to be filled in the space of bursty data parlor and transmit.
4, a kind of switching node of supporting two kinds of granularities of burst packet/IP grouping, by professional grader, this ground/following road module and full optical switch module constitute, it is characterized in that: professional grader, being used for destination address is that the data of adjacent node and data that destination address is distant-end node are classified, the convergence that transmits between the distant-end node becomes bursty data to wrap on the light burst-switched link to transmit, the free time that the The data IP that transmits between adjacent node grouping is filled in the bursty data parlor transmits in the gap, this ground/following road module comprises and converges/separate convergence module and IP grouping transmission/receiver module, wherein converge/separate convergence module, when being used to send data convergence is become burst packet, carry out when receiving data and separate aggregation feature; IP transmission/the receiver module that divides into groups is used for IP transmission of packet data and reception; Full optical switch module is used for burst packet, IP grouping of being set out on a journey in this locality and the burst packet of passing by on one's way and exchanges to corresponding output wavelength according to the resource reservation situation.
5, the switching node of two kinds of granularities of support burst packet as claimed in claim 4/IP grouping, it is characterized in that: node in the electric random asccess memory of node, is dispatched by a TS scheduler IP grouping and local storage of setting out on a journey to the data of storing in the electric random asccess memory.
6, as the switching node of two kinds of granularities of claim 4 or 5 described support burst packet/IP grouping, it is characterized in that: professional grader is classified according to qos requirement to the data between the distant-end node, and the high data of qos requirement that are about to destination address and are distant-end node enter into and converge/separate convergence module; Destination address is that the low data of qos requirement enter into IP grouping transmission/receiver module.
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| CN101771900B (en) * | 2008-12-26 | 2012-12-19 | 中兴通讯股份有限公司 | eNB optical switching device and method |
| CN102299866B (en) * | 2011-10-11 | 2014-06-04 | 重庆邮电大学 | Optical packet switching method and node aggregation device based on optical time division multiplexing technology |
| WO2015100636A1 (en) * | 2013-12-31 | 2015-07-09 | 华为技术有限公司 | Annular optical buffer and optical signal storage and reading method |
| US20160337251A1 (en) * | 2015-05-14 | 2016-11-17 | Cisco Technology, Inc. | Predictive egress packet classification for quality of service |
| CN114915595B (en) * | 2022-03-11 | 2023-08-01 | 北京邮电大学 | Burst packaging method and electronic equipment |
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| CN1625150A (en) * | 2003-12-03 | 2005-06-08 | 电子科技大学 | Method for supporting real-time service in optical burst exchange |
| CN1829391A (en) * | 2005-01-26 | 2006-09-06 | 西门子公司 | A method and apparatus for transmitting an optical signal in an optical burst switching network using arrival time |
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| CN1625150A (en) * | 2003-12-03 | 2005-06-08 | 电子科技大学 | Method for supporting real-time service in optical burst exchange |
| CN1829391A (en) * | 2005-01-26 | 2006-09-06 | 西门子公司 | A method and apparatus for transmitting an optical signal in an optical burst switching network using arrival time |
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