CN100391198C - Method for implementing packing and unpacking of giga optical Ethernet label switching network - Google Patents
Method for implementing packing and unpacking of giga optical Ethernet label switching network Download PDFInfo
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- CN100391198C CN100391198C CNB2004100892842A CN200410089284A CN100391198C CN 100391198 C CN100391198 C CN 100391198C CN B2004100892842 A CNB2004100892842 A CN B2004100892842A CN 200410089284 A CN200410089284 A CN 200410089284A CN 100391198 C CN100391198 C CN 100391198C
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Abstract
The present invention relates to a method for packing and unpacking giga optical Ethernet label switching networks, which uses two timing devices to accurately time optical Ether packets and optical mark heads at microsecond magnitude, so that the combination of optical mark packet heads and optical Ether frame packets at programmable intervals is achieved. In full consideration of the condition that the access service contains low-speed photographic trapping signals and high-speed multimedia video streams, packet length threshold values and the mechanism of time-triggered two-dimensional limiting encapsulation on the basis of service priority division are adopted, and packets are transmitted to the relevant video terminal at an exit fringe node according to the format of encapsulation after unpacked, so that the small time delay of optical Ether packets within optical domains and electric domains is ensured, the real-time processing of optical packets is realized, and the successful exchange and transmission of giga optical Ether data packets with optical mark packet heads within optical mark switching networks under microsecond magnitude are achieved. The present invention increases the utilization rate and the throughput capacity of network bandwidth, enhances the intelligence property and the flexibility of optical mark switching as well as the load capacity of multi-service access, and simultaneously optimizes the network performance.
Description
Technical field
The present invention relates to a kind of light bag packing implementation method of unpacking, relate in particular to a kind of Gigas Ether Mark Swap Network Packing And Unpack Realizing Method.Be used for the optical communication technique field.
Background technology
Along with the raising of the network bandwidth and capacity, an urgent demand breaks through the electron exchange bottleneck and greatly develops the light switching technology.The light exchange is finished network exchange exactly on the photon aspect, be divided into optical link exchange and light packet switching.Wavelength route optical network is the exchange of line level coarseness, is mainly finished by optical cross-connect and optical add/drop multiplexer.Even more ideal is optical packet switching technique, it believes that with the light that optical information is divided into light load and carrying routing iinformation head constitutes the light with set form and divides into groups not have to be connected from route switching and transmission, information needn't be waited for direct transmission before sending, and handles storage at the node place by packets headers and transmits.The light packet switching directly effectively utilizes bandwidth with the quick allocated channel of the granularity thinner than circuit switched flexibly on photosphere, but is subjected to networking and device technology restriction to be difficult to practicability in a short time.Someone proposes to cross over the light packet switching realization technology of optical device restriction, its optical packet head is made up of the light pulse of different wave length in the same wavelength channel of light load, at the switching node place, realize the exchange of light bag Route Selection by judgement to the combination of packets headers light pulse different wave length.
Find through literature search prior art, people such as Shilin Xiao are at " IEEE PhotonicsTechnology Letters " (Institute of Electrical and Electric Engineers photon technology wall bulletin) 2003,15 (4): " Realization of Multi-wavelength Label Optical PacketSwitching " (realization of multi-wavelength mark light packet switching) delivered on the 605-607, mention in this article that single wavelength light label switched demo system can not distinguish the priority service class at fringe node, can't finish the packing of light bag unpacks, the signal head of packet adds, the network edge node service convergence is integrated, sophisticated functionss such as signal and light bag time and the time-delay of light inter-packet gap are able to programme, this has seriously limited the capacity of signal exchange fringe node service access, increased signal exchange expense, lost the advantage of high-speed light exchange, reduced the wide utilance of light belt, thereby the uncontrollable flexibility that must influence signal core switching node of signal and light bag payload time causes the signal switching network to block and competition makes the network performance severe exacerbation.
Summary of the invention
The objective of the invention is to overcome the deficiency in the existing single wavelength light label switched system, a kind of Gigas Ether Mark Swap Network Packing And Unpack Realizing Method is provided, make it take into full account the luminiferous ether frame format, at signal exchange fringe node a plurality of terminal video traffics are carried out adding the signal head and the forwarding of unpacking based on the assembling of converging of priority service class, and realize the programmable delay of signal head and light bag.This has increased the bearing capacity of signal switching network to the multi-service flow, has improved network bandwidth utilance and throughput, helps the flexible Based Intelligent Control of signal exchange.
The present invention is achieved by the following technical solutions, the present invention uses two timers luminiferous ether bag and signal head to be implemented the accurate timing of microsecond magnitude, thereby reach the combination under signal packet header and the luminiferous ether frame bag programmable interval, taking into full account access service is under low speed shooting signal acquisition and the high-speed multimedia video flowing situation, employing is based on long threshold value of the bag of service class prioritization and Time Triggered two dimensional constraint encapsulation mechanism, unpack according to encapsulation format at the outlet edge node and to be forwarded to corresponding video terminal, guarantee that luminiferous ether wraps in the little time delay in light territory and the electric territory, satisfy the requirement of multimedia streaming data, realization light bag is handled in real time, and the gigabit luminiferous ether packet in realization band signal packet header under the microsecond magnitude successfully exchanges in the signal switching network and transmits.
Below by step the present invention is done further qualification:
(1) Business Stream from a plurality of video terminals arrives fringe node, trigger the fringe node processor and detect data arrival, distinguish the video flowing kind, low speed shooting signal acquisition is directly read purpose terminal and the service class precedence information that carries in electronic data bag packet header, the payload user data of electricity bag is put into corresponding data centralization formation; Data flow to arbitrary formats such as high-speed multimedia video flowings, then distinguish classes of data traffic priority level and destination node address by the mode that grasps the independent identification control bag that sends simultaneously with payload user data, in two the adjacent controlling packet intervals time of advent, all data services have identical service class and purpose terminal address, in same formation queuing.
(2) timing length and two parameters of light packet length have one to reach the initiation parameter threshold value and require promptly to trigger this queuing data packing operation in current all data queues.Otherwise the fringe node processor is got back to wait state.
(3) queuing data is overflowed and is started first timer and export the signal head that the drive level that carries data queue's terminal address is launched this light bag, signal head of setting at first timer and light inter-packet gap time are when arriving, become gigabit luminiferous ether bag, modulating light pulse laser according to definition format assembling packet.
(4) start second timer, send the luminiferous ether bag, control the time interval of this light bag and next light bag.This data queue's initialization is also got back to wait state.
The present invention is directed to existing simple optical label switched demo system, realized unpacking at signal switching network fringe node based on the light bag packing of service class priority, the signal of arbitrary data stream adds, sophisticated functionss such as signal and light bag time and the time-delay of light inter-packet gap are able to programme, network bandwidth utilance and throughput have been improved greatly, it is intelligent to have strengthened the signal exchange, the bearing capacity that flexibility and multi-service insert, but overall optical label switched system real-time characteristic and extended attribute have been improved, the application of coarsegrain light bag more helps bringing into play the big capacity of signal switching network, the advantage of high-speed light exchange, simultaneously also reduce signal switching network core node blocking rate and competition, optimized network performance.
Packaging method of the present invention uses microsecond level timer to luminiferous ether bag and the control of signal head accurate timing, thereby reach the perfect adaptation under exclusive signal packet header of the present invention and the luminiferous ether frame bag programmable interval, successfully overcome the jejune drawback of light packet switch device technology.Under multiple access service situations such as low speed shooting signal acquisition and high-speed multimedia video flowing, employing is based on the long threshold value of the bag of service class prioritization and encapsulation of Time Triggered two dimensional constraint and corresponding decapsulation mechanism, guarantee that luminiferous ether wraps in the little time delay in light territory and the electric territory, satisfy the requirement of multimedia streaming data, realization light bag is handled in real time, finishes the success of vision signal and dynamically reproduce under the microsecond magnitude.The present invention has increased the intelligent of signal switching network fringe node, make full use of the buffer memory flexible nature of electricity layer, improve network, simplify the control and the management of core optical networks multiple services adaptation ability, fundamentally improve network performance, strengthened the robustness of network self.
Description of drawings
Fig. 1 the inventive method flow chart
The video data packet format that Fig. 2 fringe node of the present invention receives
Wherein, (a) for low speed shooting signal acquisition pocket of electrons form, (b) being high-speed multimedia video flowing controlling packet form, (c) is high-speed multimedia video flowing clear data packet format.
Fig. 3 the present invention encapsulates the luminiferous ether frame format
Fig. 4 signal of the present invention and light bag be schematic diagram able to programme regularly
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing:
Fig. 1 has provided detailed luminiferous ether bag packing realization flow figure, and signal exchange test system initialization of the present invention converges queue parameter: consider the highest about every frame 100ms of acquisition speed, set low speed shooting signal acquisition formation timing length 120ms; Consider that upper-layer protocol IP bag is the actual size of 64K byte in conjunction with the capturing video bag to the maximum, sets minimum maximum light packet length and is respectively 1K byte and 10K byte; Record data according to test, setting high-speed multimedia video stream timing length 30ms, minimum maximum light packet length 1K byte is to the 15K byte.Signal switching network fringe node processor is in the obstruction wait state and waits for the access service video flowing, when having detected packet arrival, the destination address and the priority in identification electronics packet header, enter corresponding data queue buffer memory, whether the light bag formation condition of judging this data queue satisfies, if do not reach condition, then return the arrival that stand-by state continues to wait for next electronic data bag; If condition satisfies the drive level light modulated mark head of this light bag destination address correspondence of output, start light bag and signal head timer blanking time 1 simultaneously, be assurance light core node place signal is anticipated the driven optical switch matrix by the conversion of photoelectricity light time the blanking time of this signal head and light bag, can set different values down to different Test Condition Requirements, because bare headed processor speed and optical switch actuating speed are nanosecond orders, be set at 2 microseconds at interval in test so again photoelectric conversion time is taken into account this.When arrived in the blanking time of timer 1, the processor encapsulation of data was to the luminiferous ether frame, and modulating light pulse, also started luminiferous ether bag interval timer 2 simultaneously, set the blanking time of light bag payload, and is all able to programme to guarantee light bag and signal.After the luminiferous ether bag is sent completely, the initialization current queue is got back to the obstruction wait state, and in blanking time of timer 2 is set blanking time inner control and next light bag payload, this time parameter is subjected to the influence of the practical business stream and the load that accesses terminal etc., so be a dynamic parameter of adjusting, under concrete experimental condition, pass through testing setup in the test.Light of low speed shooting signal acquisition is sealed ETL estimated time of loading the chances are about 130 microsecond under the experimental enviroment, and a light package of high-speed multimedia video flowing ETL estimated time of loading is approximately less than 50 milliseconds.
Fig. 2 has described the data packet format that concrete camera is caught video and media stream, and in the low speed shooting signal acquisition pocket of electrons form (a), numeral 8 is represented the captured video data payload.Numeral 1 to 7 is represented the data of a byte respectively. Byte 1 and 2 expression assembling back light inter-packet gap times are the parameter that the timer 2 among Fig. 1 is set, and byte 3 is the purpose terminal address, byte 4 expression packet priority, and byte 5 is the source terminal address, byte 6 and 7 keeps to be used.The pocket of electrons header that the light bag packing method of unpacking of the present invention reads byte 1 to 5 carries out service priority and destination address is classified and list in order of importance and urgency, thereby gives security for producing the signal head and the transmission of luminiferous ether package frame of carrying address information.(b) in the high-speed multimedia video flowing controlling packet form meaning of byte 1 to 5 and (a) in identical, byte 6 to 8 is a reserve bytes.(c) 1 to represent this packet can be packaged arbitrarily packet in the high-speed multimedia video flowing clear data packet format, it does not need identification and analyzes its header packet information in the packing of light bag when unpacking, just as a disposed of in its entirety, the service class priority of this packet and address information are handled in independent transmission (b), the transmission of adjacent twice Electronic Control package informatin just changes the characteristic of the data flow that transmits simultaneously with it, has improved the adaptation ability that fringe node inserts multi-service.
Fig. 3 encapsulates the luminiferous ether packet format for the present invention, leading 101010 of 56 bits that comprise ... the frame demarcation 10101011 of 10 and 8 bits is totally 8 bytes, destination address and source address are respectively the physical address informations of 6 bytes, 2 bytes of upper-layer protocol type, here adopt the IP agreement at transceiver terminal, data are set to gigabit luminiferous ether super large frame (jumbo) 16110 bytes, 4 bytes of frame check.Purpose, source, type, data and frame check have constituted a complete gigabit luminiferous ether frame.Corresponding gigabit 96 nanoseconds of Ether frame of 12 bytes of frame period, data division is deposited is video data after fringe node is concentrated the formation encapsulation.To be packaged into the size of luminiferous ether frame be 8762 bytes luminiferous ether payload data bag 70.1 microseconds just to low speed shooting signal acquisition in test, multimedia video adopts the packing of 5 pure videos electricity packets after protocol encapsulation becomes the luminiferous ether bag of 6626 bytes, and promptly the bag size is 53 microseconds the high-speed video time.
The description of Fig. 4 image signal head of the present invention and light bag programmable schematic diagram regularly.T0 points out the variable definition length of gigabit luminiferous ether tag switching network packing of the present invention back light bag, and it depends on fringe node service set formation timing length and the packet threshold value minimax value of setting in the test.T1 has represented the timing length that timer 1 can be set in the packing implementation method, by this time programming is guaranteed time enough opto-electronic conversion, signal processing are arranged and pre-set the optical switch matrix switching path between signal light packet header, core node place and luminiferous ether packet, set greater than 2 microseconds in the test.T2 is the may command timing length of timer 2 in the packing implementation method, and programming Control luminiferous ether packet blanking time is according to concrete video effect with require to set to obtain the signal switched network performance of needs.
Provide the realization example that a high-speed multimedia video flowing gigabit luminiferous ether tag switching network packing is unpacked below in detail:
Three multimedia video frequency terminals connect signal switching network fringe node, the high-speed multimedia video flowing is packaged into the luminiferous ether bag at ingress edge node, and unpacking at the outlet edge node through core node exchange back then is forwarded to corresponding multimedia terminal reproduction active multi-media video flowing.The timing length of setting high-speed multimedia video stream packing is 10ms, and minimum maximum light packet length is respectively 1K byte and 15K byte.
(1) the fringe node processor is in and blocks wait state and wait for the high-speed multimedia video flowing, when having detected packet arrival, distinguish controlling packet and electronic data payload packets, the destination node address of identification control bag and service class priority, the packet that arrives soon after is put into same queuing data formation buffer memory, the light bag timing length of judgment data formation whether surpasses 10ms or whether the light packet length surpasses 15K, if these two conditions all do not satisfy, then return the arrival that stand-by state continues to wait for next electronic data bag.
(2) light bag data queue overflows and starts first timer and be set to 2 microseconds, and the signal head of the drive level light modulated bag of data queue's terminal address is carried in output, when 2 microseconds of first timer signal head and light bag arrive blanking time, become gigabit luminiferous ether bag, modulating light pulse laser by Fig. 3 frame format assembling packet.
(3) start the second timer control luminiferous ether 10 ms interval times of bag, send the luminiferous ether bag.This data queue's initialization is also got back to wait state.
Reached good effect in the superincumbent actual tests of the present invention, high-speed multimedia video flowing timing controlled is less than 10 milliseconds, and the packing of 5 bags is unpacked through signal switching network echo, and video flowing is unobstructed, and video quality is good.Equally, terminal low speed camera is captured in frame frequency 100ms/ frame under the 640*480 resolution, unpacks by controlled programming packing in the test and has realized that also vision signal shows continuously.
Claims (1)
1. Gigas Ether Mark Swap Network Packing And Unpack Realizing Method based on software is characterized in that concrete steps are as follows:
(1) Business Stream of a plurality of video terminals arrives and triggers the fringe node processor, distinguishes the video flowing kind, and low speed shooting signal acquisition is directly read address and the precedence information that carries in electronic data packet header, and payload user data is put into corresponding concentrated formation; To data flow, then by grasping the mode differentiated service class priority and the address of the independent identification control bag that sends simultaneously with payload user data, in the adjacent controlling packet interval time of advent, all data have identical service class and terminal address, in same formation queuing;
(2) timing length and two parameters of light packet length have one to reach the initiation parameter threshold value and require promptly to trigger this queuing data packing operation in current all data queues, otherwise the fringe node processor is got back to wait state;
(3) queuing data is overflowed and is started first timer and export the signal head that the drive level that carries data queue's terminal address is launched this light bag, signal head of setting at first timer and light inter-packet gap time are when arriving, become gigabit luminiferous ether bag, modulating light pulse laser according to definition format assembling packet;
(4) start second timer, send the luminiferous ether bag, control the time interval of this light bag and next light bag, this data queue's initialization is also got back to wait state.
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| CN1984028A (en) * | 2005-11-28 | 2007-06-20 | 华为技术有限公司 | Method for transmitting data packet |
| CN101394310B (en) * | 2008-11-04 | 2011-05-04 | 烽火通信科技股份有限公司 | Apparatus and method for constructing management communication network and signaling communication network |
| CN101414978B (en) * | 2008-11-19 | 2012-02-22 | 中兴通讯股份有限公司 | Method for processing cascade connection cell fragment |
| WO2015109606A1 (en) * | 2014-01-27 | 2015-07-30 | 华为技术有限公司 | Data exchange device and system |
| CN104780471B (en) * | 2014-12-29 | 2018-11-27 | 国家电网公司 | A kind of all optical networks fringe node light packet data framing method |
| CN112825065A (en) * | 2019-11-21 | 2021-05-21 | 北京希姆计算科技有限公司 | Data processing circuit, apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1431834A (en) * | 2003-01-16 | 2003-07-23 | 上海交通大学 | Automatic exchange control method of mixed light network in multiple granularities |
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| CN1431834A (en) * | 2003-01-16 | 2003-07-23 | 上海交通大学 | Automatic exchange control method of mixed light network in multiple granularities |
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Assignee: Hangzhou Telecom Planning and Design Institute Assignor: Shanghai Jiao Tong University Contract fulfillment period: 2008.10.8 to 2014.10.7 contract change Contract record no.: 2008330001468 Denomination of invention: Method for implementing packing and unpacking of giga optical Ethernet label switching network Granted publication date: 20080528 License type: Exclusive license Record date: 20081029 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.10.8 TO 2014.10.7; CHANGE OF CONTRACT Name of requester: TELECOM PLANNING + DESIGN INSTITUTE, HANGZHOU CITY Effective date: 20081029 |
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