CN101841749A - Data transmission method, communication device and communication system - Google Patents
Data transmission method, communication device and communication system Download PDFInfo
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Abstract
The embodiment of the invention discloses a data transmission method, a communication device and a communication system. The method comprises the following steps: dividing a virtual cascade container of an optical transport network into a plurality of time slots; according to the data rate of the service type to be transmitted, carrying the data of the service type by using at least one time slot; and carrying data of other service types by using the rest of the divided time slots. The communication device comprises a time slot dividing module and a processing module, wherein the time slot dividing module is used for dividing the virtual cascade container of the optical transport network into a plurality of time slots; the processing module is used for carrying the data of the service type by using at least one time slot according to the data rate of the service type to be transmitted; and the rest of the divided time slots are used for carrying data of other service types. The technical scheme can reduce the transmission bandwidth waste and increase the utilization ratio of the transmission bandwidth.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of data transmission method, communicator and communication system.
Background technology
Optical transfer network (OTN, Optical Transport Network) technology is a kind of new light tranmission techniques, can realize the flexible dispatching and the management of big capacity business, has become the mainstream technology of Backbone Transport Network at present.
Along with the develop rapidly of data service, more and more data business interface particularly Ethernet (Ethernet) interface is applied in the telecom operation network.10G rank network and 40G rank network will for a long time and be deposited at present, and 100G rank network is also in development.Along with the commercialization of hundred gigabit Ethernets (100GE, 100giga Bit Ethernet) interface, how current 10G and 40G rank network faces transmit the problem of 100GE data service.The method that transmits by OTN for emerging 100GE data service of using the 100GE Ethernet interface comprises several modes at present: the Optical Channel Data Unit-k 2 (ODU2 that can select 11 10G bandwidth, Optical Channel Data Unit2) transmits, or the ODU3 of 3 40G bandwidth transmits, or the ODU4 of 1 100G transmits.Wherein, ODU is obtained by optical channel Payload Unit (OPU, Optical Channel Payload Unit) increase overhead part.
In research and practice process to prior art, the inventor finds that there is following problem in prior art: the method for selecting the ODU3 of 3 40G bandwidth to transmit with prior art is an example, because the bandwidth of an ODU3 is about 40G, and the required bandwidth of 100GE data service is 103.125G, this just makes the bandwidth of two ODU3 not enough, and the bandwidth of 3 ODU3 causes nearly 20% bandwidth waste.There is similar problem in the method that transmits for the ODU2 that selects 11 10G bandwidth.Except the 100GE business, there be the bandwidth and the unmatched problem of virtual cascade group of type of service too in other business.Therefore, there is the problem of transmission bandwidth waste in art methods.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides a kind of data transmission method, communicator and communication system, can reduce the transmission bandwidth waste, improves the transmission bandwidth utilance.
For solving the problems of the technologies described above, embodiment provided by the present invention is achieved through the following technical solutions:
The embodiment of the invention provides a kind of data transmission method, comprising:
The Virtual Concatenation container of optical transfer network is divided into a plurality of time slots;
The data rate of Chuan Shu type of service uses at least one time slot to carry the data of described type of service as required;
Use remaining time slot in the time slot of dividing, carry the data of other types of service.
The embodiment of the invention provides a kind of communicator, comprising:
Time slot is divided module, is used for the Virtual Concatenation container of optical transfer network is divided into a plurality of time slots;
Processing module, the data rate of the type of service that is used for transmitting as required uses at least one time slot to carry the data of described type of service; Use remaining time slot in the time slot of dividing, carry the data of other types of service.
The embodiment of the invention provides a kind of communicator, comprising:
Receiver module is used to receive Optical Channel Transport Unit-k OTU, and described Optical Channel Transport Unit-k OTU carries the data of at least two kinds of types of service;
Processing module, after being used for described Optical Channel Transport Unit-k OTU obtained the Virtual Concatenation container through overhead processing, identify the different time-gap corresponding service type of forming the Virtual Concatenation container, isolate dissimilar light data tributary unit groups according to described type of service, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service.
The embodiment of the invention provides a kind of communication system, comprising:
The transmitting terminal device is used for the Virtual Concatenation container of optical transfer network is divided into a plurality of time slots; A kind of data map of type of service is arrived the light data tributary unit group that at least one time slot is formed; The light data tributary unit group that the data map of other types of service is formed to described remaining time slot; Each light data tributary unit group is multiplexing, generate the Virtual Concatenation container, the Virtual Concatenation container that generates is increased expense obtain Optical Channel Data Unit-k ODU, described Optical Channel Data Unit-k ODU is increased expense obtain Optical Channel Transport Unit-k OTU, described Optical Channel Transport Unit-k OUT is outwards sent;
Receiving end device, be used to receive Optical Channel Transport Unit-k OTU, described Optical Channel Transport Unit-k OTU carries the data of at least two kinds of types of service, after described Optical Channel Transport Unit-k OTU obtained the Virtual Concatenation container through overhead processing, identify the different time-gap corresponding service type of forming the Virtual Concatenation container, isolate dissimilar light data tributary unit groups according to described type of service, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service.
Technique scheme as can be seen, the embodiment of the invention is by dividing time slot with the Virtual Concatenation container of optical transfer network, so just can make full use of each time slot, can use at least one time slot to carry a kind of data of type of service, and remaining time slot just can carry the data of other types of service, so also the bandwidth that just makes the Virtual Concatenation container be had can fully be utilized, thereby reduces the transmission bandwidth waste, improves the transmission bandwidth utilance.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the embodiment of the invention one a data transmission method flow chart;
Fig. 2 is the embodiment of the invention two data transmission method flow charts;
Fig. 3 is the time slot Virtual Concatenation structural representation of the embodiment of the invention;
Fig. 4 is an embodiment of the invention ODU4et structural representation;
Fig. 5 is the structural representation of embodiment of the invention ODvTU10/12;
Fig. 6 is communicator one structural representation of the embodiment of the invention;
Fig. 7 is communicator two structural representations of the embodiment of the invention;
Fig. 8 is the structural representation of the communication system of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention provides a kind of data transmission method, can reduce the transmission bandwidth waste, improves the transmission bandwidth utilance.
Existing standard has defined Virtual Concatenation (virtual concatenation) method in G.709 and has realized using a plurality of low rate containers to transmit high-speed datas.The Virtual Concatenation container OPUk-XV that defines in the existing standard is as a whole, carries a kind of data of particular traffic type.Embodiment of the invention method is to be divided into some time slots with OPUk-XV, utilize the data instance explanation of different time-gap group carrying different service types, also can be that ODUk-XV is divided into some time slots in addition, and ODUk-XV is divided into some time slots, also be that the OPUk-XV among the ODUk-XV is divided time slot in fact.
Therefore, of particular note, the Virtual Concatenation container of mentioning in embodiments of the present invention both can be that OPU also can be ODU.For instance: transmit leg is divided into time slot with the Virtual Concatenation container, both can be meant directly OPU had been divided into time slot, also can be meant ODU is divided into time slot: and the recipient obtains the Virtual Concatenation container to OTU through overhead processing, the situation that the time slot of the Virtual Concatenation container being divided according to transmit leg is handled, both can be meant and handle Optical Channel Transport Unit-k (OTU, Optical ChannelTransport Unit 3) expense generates ODU, also can be meant to handle OTU expense and ODU expense generation OPU.
Fig. 1 is the embodiment of the invention one a data transmission method flow chart, comprises step:
Remaining time slot in step 103, the time slot that use to divide carries the data of other types of service.
Wherein, the Virtual Concatenation container is the optical channel Payload Unit OPU or the Optical Channel Data Unit-k ODU of three Virtual Concatenations.
The time slot of above-mentioned carrying data is a continuous time slot, perhaps is time slot at interval.
When the data of using at least one time slot loaded service type are the data of hundred gigabit Ethernet data services, for example use ODU3 or OPU3 carrying, if the time slot of dividing is 12 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 10 time slots; Perhaps, if the time slot of dividing is 48 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 40 time slots; Perhaps, if the time slot of dividing is 96 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 80 time slots.
From embodiment one content as can be seen, the embodiment of the invention is by dividing time slot with the Virtual Concatenation container of optical transfer network, so just can make full use of each time slot, can use at least one time slot to carry a kind of data of type of service, and remaining time slot just can carry the data of other types of service, so also the bandwidth that just makes the Virtual Concatenation container be had can fully be utilized, thereby reduces the transmission bandwidth waste, improves the transmission bandwidth utilance.
Fig. 2 is the embodiment of the invention two data transmission method flow charts.
This embodiment content is the example explanation with OPU3-3V carrying 100GE data service and other types business but is not limited thereto.
As shown in Figure 2, may further comprise the steps:
To adopt OPU3-3V, OPU3-3V is divided some time slot TS (time slot) illustrate in the embodiment of the invention as the Virtual Concatenation container.Also can be that ODU3-3V is divided into some time slots in addition, and ODU3-3V is divided into some time slots, also be that the OPU3-3V among the ODU3-3V is divided time slot in fact.
Fig. 3 is the time slot Virtual Concatenation structural representation of the embodiment of the invention.
As shown in Figure 3, the data rate of the type of service that can transmit as required is divided into the structure of setting the number time slot with OPU3-3V, for example is divided into 12 time slots.Among Fig. 3, comprise virtual concatenation overhead byte (VCOH, Virtual Concatenation Overhead), payload structural identification (PSI, PayloadStructure Identifier), general shadowing agreement is adjusted control byte (GMP, Generic Mappingprotocol), negative justification opportunity byte (NJO, Negative Justification Opportunity), the multi-frame in the ODUk expense is indicated (MFAS, Multi-frame alignment Signal) synchronously.The time slot that OPU3-3V divides is TS1-TS12, can adopt the distribution mode that interleaves by the row circulation, 952 row of each Time Slot Occupancy OPU3-3V payload area.The time slot of these divisions can be alone or in combination together by light data tributary unit (ODTUjk, Optical Data Tributary Unit-jk) carrying data, wherein k represents that total time slot of dividing, j represent the time slot that takies.The time slot of combination can be a continuous time slot, also can be time slot at interval.
The container speed of each time slot is calculated by following computational methods: 3*238/236*16*2.488320/12=10.03762983Gb/s, and the container speed that therefore obtains each time slot is 10.03762983Gb/s, each time slot can carry other data of 10G level.
The data map of step 202, wherein a kind of data service is to the light data tributary unit of being made up of the time slot of dividing;
Specifically be that the data general-purpose of wherein a kind of data service mapping rules are mapped among the light data tributary unit ODTUjk that is made up of the time slot of dividing in this step.Illustrate with the 100GE data service in this step but be not limited to this.
The speed of 100GE data service is 103.125Gb/s ± 100ppm, if adopting the mode of code conversion is the code conversion of 64B/66B the coding of 513B/512B, then the speed of the 100GE data service after the conversion is: 100X513/512=100.1953125Gb/s.
Can obtain Frame if will increase overhead part through the data flow of the 100GE data service after the code conversion, the embodiment of the invention calls ODU4et to this data frame structure.The speed of this Frame need be controlled in the scope that 10 time slot speed can hold.
Fig. 4 is an embodiment of the invention ODU4et structural representation.As shown in Figure 4, comprise frame synchronization (FA, Frame Alignment), expense (OH, Overhead), payload user data part (payload).The payload part of fetching data (payload) is 16 row for 4*3808 row, expense (OH) district, and then data frame structure is 4* (3808*4+16) byte.ODU4et speed is calculated by following computational methods: (3808*4+16)/and 3808/4* (100*513/512) Gb/s ± 100ppm=100.3005597Gb/s ± 100ppm, therefore Frame ODU4et speed is 100.3005597Gb/s ± 100ppm, this speed is less than the container speed of 10 time slots, so wherein 10 time slots of OPU3-3V can carry the data of 100GE data service.
ODU4et is mapped in the light data tributary unit group of 10 time slots compositions by general mapping rules, and this light data tributary unit group can be defined as ODvTU10/12, the time slot total number that 12 expressions are divided, the number of time slot that 10 expressions take.
Fig. 5 is the structural representation of embodiment of the invention ODvTU10/12.
After obtaining ODU4et, need be mapped to ODvTU10/12 to ODU4et, take 10 time slots, this mapping process is the asynchronous mapping process.As shown in Figure 5, ODvTU10/12 is the structure of 9520 row, 16 row.Adjust control byte (JC, Justification Control) is 9, calculating the fixing row (stuff) of filling according to the standard speed of ODU4et and ODvTU10/12 and frequency deviation region is 7 row, use 24 positive justification opportunity bytes (PJO, Positive Justification Opportunity) and 16 negative justification opportunity byte N JO.Positive justification opportunity byte PJO and negative justification opportunity byte N JO are distributed in 4,8,12,16 row, every row 6 PJO of distribution and 4 NJO.PJO and NJO can hold respectively+the positive frequency deviation of 157ppm and-105ppm negative frequency deviation.Consider the positive and negative 20ppm frequency deviation that ODvTU10/12 itself has, therefore calculate the speed of the bound that ODvTU10/12 can carry:
Lower rate limit: 238/236*16*2.488320/4*10-137ppm=100.2887508Gb/s
Upper rate limit: and 238/236*16*2.488320/4*10+85ppm=100.3110179Gb/s
Therefore the speed range of the bound that can carry of ODvTU10/12 is for (100.2887508Gb/s 100.3110179Gb/s), can satisfy the speed range (100.3005597Gb/s ± 100ppm) of ODU4et.
In the process of mapping,, indicate positive justification opportunity byte and negative justification opportunity byte in the described smooth data tributary unit group to be adjustment byte of padding or data byte by the bit of adjusting control byte is carried out different values.Below describe how specifically to utilize and adjust control byte JC indication NJO/PJO for adjusting byte of padding or data byte.
Referring to table 1, because JC1 has 24 bits (Bit) to JC3, therefore it is divided into 4 zones, every zone comprises 6 bits, 6 PJO and 4 NJO in corresponding every Frame.Zone 1 is Bit1-6, corresponding PJO1-6 and NJO1-4; Zone 2 is bit Bit7-12,, corresponding PJO7-12 and NJO5-8; Zone 3 is Bit13-18, corresponding PJO13-18 and NJO9-12; Zone 4 is Bit19-24, corresponding PJO19-24 and NJO13-16.The value of latter two bit in 6 bits in every zone can be determined that NJO/PJO adjusts byte of padding or data byte, for example, latter two bit value of Bit1-6 is 00, and expression PJO is a data byte, and NJO is the adjustment byte of padding; Value is 01, and expression PJO is for adjusting byte of padding, and NJO is for adjusting byte of padding; Value is 10, and expression PJO is a data byte, and NJO is a data byte;
Table 1
Bit 7-12, Bit 13-18, dibit is indicated NJO, the PJO of their correspondence respectively behind the Bit 19-24, and the indication rule is identical with table 1.
ODvTU10/12 has taken 10 time slots, and 2 remaining time slots can be used for the data of other types of service.Each time slot in 2 remaining time slots can adopt existing tributary unit ODTU23.A tributary unit ODTU23 can carry the data of a 10G level traffic, promptly can carry an ODU2, and ODU2 is mapped among the ODTU23.This mapping process is the asynchronous mapping process, carry out the asynchronous mapping compensation by positive justification opportunity byte PJO and negative justification opportunity byte N JO, the JC byte is used to refer to NJO/PJO for adjusting byte of padding or data byte, can use the mode that defines among the similar ODvTU10/12 to indicate, also can continue to use the mode of the G.709 middle ODTU23 definition of existing standard and indicate.
This step is carried out multiplexing process with each light data tributary unit group that above-mentioned steps obtains, and generates the Virtual Concatenation container.
Above-mentioned finishing data map behind ODvTU10/12 and ODTU23 is multiplexed in the Frame of OPU3-3V again.
It is as follows that ODvTU10/12 is multiplexed into the OPU3-3V process: 9 JC bytes of ODvTU10/12 are put into the position of GMP, and the data byte of the common 952*10*16 size of payload area (Payload zone) is put in the 1-10 time slot.These 10 time slots can be any 10 in 12 time slots, and promptly time slot can be continuous, also can be at interval.
It is as follows that ODTU23 is multiplexed into the OPU3-3V process: 3 JC bytes of ODTU23 are taken 3 row that are listed as in the GMP bytes, other two row are made the reserved word joint, use a NJO byte, two NJO bytes are put into the data byte that is total to the 952*16 size in the time slot as reserve bytes in addition.
Through above-mentioned multiplexing process, then can obtain the Virtual Concatenation container.
In addition, the Virtual Concatenation container can be indicated the multi-frame circulation by MFAS.For OPU3-3V, by the circulation of MFAS indication multi-frame.Because according to rate requirement, 100GE will take 10 time slots as a group, can independently use for also surplus 2 time slots of 12 time slots dividing, if each time slot of these two time slots is also as a group, then independently the time slot group has 3 at most, and adopting 4 frames to circulate by MFAS indication multi-frame circulation time just can these time slot group of mark.
Carrying out in the process of multiplexing process, can indicate each described time slot corresponding service type by the payload structural identification, mainly is to utilize not indicate each described time slot corresponding service type with coding section in the payload structural identification:
In the multi-frame circulation of 4 frames (value is 00-11) of MFAS for the cycle, at which time slot placement ODTU23 and ODvTU10/12 can indicate by expansion PSI byte, specific as follows:
When MFAS=00, corresponding PSI[0] be defined as payload traffic type indication byte (PT, Payload Type), when PT=06H, represent the Virtual Concatenation structure.The embodiment of the invention further expands on this basis, makes full use of PSI[1] byte.PSI[1] byte is defined as Virtual Concatenation type of service indication byte (vcPT) in the prior art, comprising not using coding section.Embodiment of the invention utilization coding section, definition is as PSI[1]=be embodiment of the invention time slot Virtual Concatenation structure shown in Figure 3 during 08H.In addition, further utilize PSI[2] byte is to PSI[13] type of service (can be that ODvTU10/12 takies the 1-10 time slot, ODTU23 takies other two time slots respectively) of byte indication time slot corresponding group.Shown in the indication process table 2 specific as follows:
| The PSI value | The TS type |
| ??PSI2＝01 | ??ODvTU10/12 |
| ??PSI3＝01 | ??ODvTU10/12 |
| ??PSI4＝01 | ??ODvTU10/12 |
| ??PSI5＝01 | ??ODvTU10/12 |
| ??PSI6＝01 | ??ODvTU10/12 |
| ??PSI7＝01 | ??ODvTU10/12 |
| ??PSI8＝01 | ??ODvTU10/12 |
| ??PSI9＝01 | ??ODvTU10/12 |
| ??PSI10＝01 | ??ODvTU10/12 |
| The PSI value | The TS type |
| ??PSI11＝01 | ??ODvTU10/12 |
| ??PSI12＝10 | ??ODTU23 |
| ??PSI13＝10 | ??ODTU23 |
Table 2
Need to prove that 10 time slots that ODvTU10/12 takies also can be discontinuous 10 time slots.
In the multi-frame circulation of 4 frames (value is 00-11) of MFAS for the cycle, one group of JC byte that every circulation 4 frames of MFAS will corresponding ODvTU10/12, JC byte that also can corresponding two groups of ODTU23 simultaneously.Situation for dividing 12 time slots can occur 3 groups of JC bytes at most in 4 frame multi-frame cycle periods.The JC control byte that can place ODvTU10/12 in the GMP position of the 1st frame in the circulation of 4 frames, the JC control byte of placing ODTU23 in the GMP position of the 3rd, 4 frames.If two remaining time slots are formed a time slot group bearing data service, then the JC byte of Dui Ying tributary unit can be placed on the GMP position of the 3rd frame, or is placed on the GMP position of the 4th frame, and other unused bits are put and are filled to reserve bytes.
Said process is finished multiplexing, after generating Virtual Concatenation container OPU3-3V, just can generate virtual concatenation overhead according to existing G.709 defined method, OPU3-3V is split as 3 independent O PU3 according to the existing Virtual Concatenation method for splitting that defines, each OPU3 is increased the ODU overhead part generate ODU3, again ODU is increased overhead part and generate Optical Channel Transport Unit-k 3 (OTU3, Optical Channel TransportUnit 3), then OTU3 is outwards sent by circuit.
From embodiment two contents as can be seen, the embodiment of the invention is divided into 12 time slots by the Virtual Concatenation container OPU3-3V with optical transfer network, so just can make full use of each time slot, 10 time slots can be combined and carry the data of 100GE data service, and remaining 2 time slots just can respectively carry the data (for example ODU2) of other types of service, the bandwidth that so also just makes Virtual Concatenation container OPU3-3V be had can fully be utilized, thereby reduce the transmission bandwidth waste, improve the transmission bandwidth utilance.In addition, in the process of mapping, can indicate positive justification opportunity byte and negative justification opportunity byte in the described smooth data tributary unit group to be adjustment byte of padding or data byte by the bit of adjusting control byte is carried out different values; In the process of carrying out multiplexing process, can indicate the time slot corresponding service type of described division by the field of payload structural identification (PSI).
Need to prove, foregoing is to illustrate but be not limited to this to be divided into 12 time slots, for example can divide the time slot particle forr a short time, for example be divided into 48 time slots, 40 time slots data that can carry the 100GE after the code conversion wherein then, corresponding light data tributary unit is ODvTU40/48, and each time slot of other 8 time slots can carry an ODU1, and corresponding light data tributary unit is ODTU13; Divide 96 time slots, 80 time slots data that can carry the 100GE after the code conversion wherein then, corresponding light data tributary unit is ODvTU80/96, each time slot of other 16 time slots can carry an ODU0.Divide for different time-gap, corresponding, the structure of ODvTU and ODTU and the position distribution of PJO/NJO can according to circumstances be done some changes and get final product, and its principle is identical with the principle of foregoing.
Also need to prove, foregoing is that the data with data of carrying the 100GE data service respectively and ODU2 illustrate but are not limited to this, also can be the data of multiple other types of service of carrying, only the time slot of dividing need be distributed, by some time slots a kind of type of service data of corresponding carrying that combine, remaining time slot carries the data of another kind of type of service again, if also have the time slot residue, then can also carry the data of other types of service again.
In addition, also can select OPU3e-3V as the Virtual Concatenation container, i.e. the data service of OPU3e-3V carrying 100GE data service and other types to the Virtual Concatenation container selection.Because OPU3e-3V has promoted speed at Fast Ethernet, so divide the data that 10 time slots behind 12 time slots can hold the 100GE data service, then the data of 100GE data service can not need to carry out code conversion.The process of the above-mentioned employing OPU3-3V carrying of other processes 100GE data service is identical.
Also have,, pass through the mode that NJO byte, PJO byte and JC byte are handled, can also adopt for example mapping multiplexing method that adopts of ODU4 etc. of other existing mode except what embodiment described for the asynchronous mapping process of ODU4et to ODvTU10/12.
Foregoing description be the processing procedure of transmitting terminal, corresponding, as follows in the receiving terminal processing procedure:
Receive the data that Optical Channel Transport Unit-k OTU3 utilizes the different service types that different time-gap carried that the Virtual Concatenation container is divided; After described Optical Channel Transport Unit-k OTU3 obtained described Virtual Concatenation container through overhead processing, identify different time-gap corresponding service type, isolate dissimilar light data tributary unit groups according to described type of service, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service.The following description of detailed process:
Transmitting terminal generates OTU3 after splitting into independent O DU3, because the transmit path difference of 3 OTU3, so there is relative time delay in the OTU3 that can cause receiving terminal to receive.
Obtain ODU3 after the OTU3 processing expenditure part of receiving terminal with reception, handle the expense of each ODU3 again, by explaining the PSI byte, when being found to be the Virtual Concatenation structure according to analysis result (PSI[0]=06H), then the OPU3 that comprises among 3 ODU3 is put into buffer, by processing to virtual concatenation overhead, 3 OPU3 Frames are carried out the relative time delay compensation, be reassembled as the OPU3-3V Frame.
For the OPU3-3V Frame after the reorganization, again according to PSI[1] indication of byte handles, if vcPT is PSI[1]=08H then show that this OPU3-3V is the Virtual Concatenation structure of time slotization.According to PSI[2]-PSI[13] type of light data tributary unit of indication identification time slot carrying of byte is types such as ODvTU or ODTU.These light data tributary units are separated from OPU3-3V, formed independent O DvTU or ODTU light data tributary unit.
At last,, resolve the adjustment control byte JC of mapping, the indication recognition data byte by JC and adjust byte of padding according to the definition of the frame structure of light data tributary unit.After removing the adjustment byte of padding, acquire continuous data by separating the asynchronous mapping process.
More than describe the method for embodiment of the invention transfer of data in detail, corresponding, the embodiment of the invention provides corresponding device thereof and system.
Fig. 6 is communicator one structural representation of the embodiment of the invention.This communicator is the transmitting terminal device.
As shown in Figure 6, communicator comprises: time slot is divided module 51, processing module 52.
Time slot is divided module 51, is used for the Virtual Concatenation container of optical transfer network is divided into a plurality of time slots;
Multiplexing module 522 is used for each light data tributary unit group multiplexingly, generates the Virtual Concatenation container and advances.
Multiplexing module 522 comprises in multiplexing process by the payload structural identification indicates each described time slot corresponding service type.
The Virtual Concatenation container that time slot division module 51 is carried out the time slot division is the Virtual Concatenation of optical channel Payload Unit OPU or the Virtual Concatenation of Optical Channel Data Unit-k ODU.
When the Virtual Concatenation container is the optical channel Payload Unit OPU3 of three Virtual Concatenations or Optical Channel Data Unit-k ODU3, when the data of using at least one time slot loaded service type are the data of hundred gigabit Ethernet data services, if the time slot of dividing is 12 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 10 time slots; Perhaps, if the time slot of dividing is 48 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 40 time slots; Perhaps, if the time slot of dividing is 96 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 80 time slots.
Fig. 7 is communicator two structural representations of the embodiment of the invention.This communicator is a receiving end device.
As shown in Figure 7, communicator comprises: receiver module 55, processing module 56.
Described processing module 56 comprises: decomposing module 561, time slot identification module 562, separate and separate mapping block 563.
Decomposing module 561 is used for described Optical Channel Transport Unit-k OTU is obtained Optical Channel Data Unit-k ODU through overhead processing, and described Optical Channel Data Unit-k ODU is obtained optical channel Payload Unit OPU through overhead processing;
Time slot identification module 562 is used for identifying each described time slot corresponding service type that optical channel Payload Unit OPU divides according to the payload structural identification;
Separate and separate mapping block 563, be used for isolating dissimilar light data tributary unit groups, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service according to described type of service.
Above-mentioned said OUT, ODU and OPU can be respectively OUT3, ODU3 and OPU3.
Fig. 8 is the structural representation of the communication system of the embodiment of the invention.
As shown in Figure 8, communication system comprises: transmitting terminal device 61, receiving end device 62.
Transmitting terminal device 61 is used for the Virtual Concatenation container of optical transfer network is divided into a plurality of time slots; A kind of data map of type of service is arrived the light data tributary unit group that at least one time slot is formed; The light data tributary unit group that the data map of other types of service is formed to described remaining time slot; Each light data tributary unit group is multiplexing, generate the Virtual Concatenation container, the Virtual Concatenation container that generates is increased expense obtain Optical Channel Data Unit-k ODU, described Optical Channel Data Unit-k ODU is increased expense obtain Optical Channel Transport Unit-k OTU, described Optical Channel Transport Unit-k OUT is outwards sent;
Receiving end device 62, be used to receive Optical Channel Transport Unit-k OTU, described Optical Channel Transport Unit-k OTU carries the data of at least two kinds of types of service, after described Optical Channel Transport Unit-k OTU obtained described Virtual Concatenation container through overhead processing, identify the different time-gap corresponding service type of forming the Virtual Concatenation container, isolate dissimilar light data tributary unit groups according to described type of service, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service.
In addition, transmitting terminal device 61 has above-mentioned structure shown in Figure 6, and receiving end device 62 has above-mentioned structure shown in Figure 7, specifically describes referring to the front, repeats no more herein.
In sum, the embodiment of the invention is by dividing time slot with the Virtual Concatenation container of optical transfer network, so just can make full use of each time slot, can use at least one time slot to carry a kind of data of type of service, and remaining time slot just can the bearer service type data, so also the bandwidth that just makes the Virtual Concatenation container be had can fully be utilized, thereby reduces the transmission bandwidth waste, improves the transmission bandwidth utilance.
Further, embodiment of the invention technical scheme can be indicated the time slot corresponding service type of described division by the payload structural identification in the process of carrying out multiplexing process.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, read-only memory for example, disk or CD etc.
More than data transmission method, communicator and communication system that the embodiment of the invention provided are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1. a data transmission method is characterized in that, comprising:
The Virtual Concatenation container of optical transfer network is divided into a plurality of time slots;
The data rate of Chuan Shu type of service uses at least one time slot to carry the data of described type of service as required;
Use remaining time slot in the time slot of dividing, carry the data of other types of service.
2. data transmission method according to claim 1 is characterized in that:
At least one time slot of described use carries the data of described type of service; Use remaining time slot in the time slot of dividing, carry the data of other types of service, be specially:
A kind of data map of type of service is arrived the light data tributary unit group that described at least one time slot is formed;
The light data tributary unit group that the data map of described other types of service is formed to described remaining time slot;
Each light data tributary unit group is multiplexing, generate the Virtual Concatenation container.
3. data transmission method according to claim 2 is characterized in that:
In multiplexing process, comprise, indicate each described time slot corresponding service type by the payload structural identification.
4. according to each described data transmission method of claim 1 to 3, it is characterized in that:
Carrying is a continuous time slot with a kind of time slot of data of type of service, perhaps is time slot at interval.
5. according to each described data transmission method of claim 1 to 3, it is characterized in that:
Described Virtual Concatenation container is the Virtual Concatenation of optical channel Payload Unit OPU, or the Virtual Concatenation of Optical Channel Data Unit-k ODU.
6. according to each described data transmission method of claim 1 to 3, it is characterized in that:
Optical channel Payload Unit OPU3 that described Virtual Concatenation container is three Virtual Concatenations or Optical Channel Data Unit-k ODU3;
Accordingly,
When the data of at least one time slot loaded service type of described use are the data of hundred gigabit Ethernet data services,
If the time slot of dividing is 12 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 10 time slots; Perhaps,
If the time slot of dividing is 48 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 40 time slots; Perhaps,
If the time slot of dividing is 96 time slots, the time slot that carries the data of described hundred gigabit Ethernet data services is 80 time slots.
7. a communicator is characterized in that, comprising:
Time slot is divided module, is used for the Virtual Concatenation container of optical transfer network is divided into a plurality of time slots;
Processing module, the data rate of the type of service that is used for transmitting as required uses at least one time slot to carry the data of described type of service; Use remaining time slot in the time slot of dividing, carry the data of other types of service.
8. communicator according to claim 7 is characterized in that, described processing module comprises:
Mapping block is used for the light data tributary unit group that a kind of data map of type of service is formed to described at least one time slot; The light data tributary unit group that the data map of described other types of service is formed to described remaining time slot;
Multiplexing module is used for each light data tributary unit group multiplexingly, generates the Virtual Concatenation container.
9. communicator according to claim 8 is characterized in that:
Described Multiplexing module comprises by the payload structural identification in multiplexing process, indicates each described time slot corresponding service type.
10. according to each described communicator of claim 7 to 9, it is characterized in that:
The Virtual Concatenation container that described time slot division module is carried out the time slot division is the Virtual Concatenation of optical channel Payload Unit OPU or the Virtual Concatenation of Optical Channel Data Unit-k ODU.
11. a communicator is characterized in that, comprising:
Receiver module is used to receive Optical Channel Transport Unit-k OTU, and described Optical Channel Transport Unit-k OTU carries the data of at least two kinds of types of service;
Processing module, after being used for described Optical Channel Transport Unit-k OTU obtained the Virtual Concatenation container through overhead processing, identify the different time-gap corresponding service type of forming the Virtual Concatenation container, isolate dissimilar light data tributary unit groups according to described type of service, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service.
12. communicator according to claim 11 is characterized in that, described processing module comprises:
Decomposing module is used for described Optical Channel Transport Unit-k OTU is obtained Optical Channel Data Unit-k ODU through overhead processing, and described Optical Channel Data Unit-k ODU is obtained optical channel Payload Unit OPU through overhead processing;
The time slot identification module is used for according to the payload structural identification, identifies each described time slot corresponding service type of dividing among the optical channel Payload Unit OPU;
Separate and separate mapping block, be used for isolating dissimilar light data tributary unit groups, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service according to described type of service.
13. a communication system is characterized in that, comprising:
The transmitting terminal device is used for the Virtual Concatenation container of optical transfer network is divided into a plurality of time slots; A kind of data map of type of service is arrived the light data tributary unit group that at least one time slot is formed; The light data tributary unit group that the data map of other types of service is formed to described remaining time slot; Each light data tributary unit group is multiplexing, generate the Virtual Concatenation container, the Virtual Concatenation container that generates is increased expense obtain Optical Channel Data Unit-k ODU, described Optical Channel Data Unit-k ODU is increased expense obtain Optical Channel Transport Unit-k OTU, described Optical Channel Transport Unit-k OUT is outwards sent;
Receiving end device, be used to receive Optical Channel Transport Unit-k OTU, described Optical Channel Transport Unit-k OTU carries the data of at least two kinds of types of service, after described Optical Channel Transport Unit-k OTU obtained the Virtual Concatenation container through overhead processing, identify the different time-gap corresponding service type of forming the Virtual Concatenation container, isolate dissimilar light data tributary unit groups according to described type of service, described dissimilar light data tributary unit group is separated mapping handle, obtain the data of corresponding type of service.
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| CN 200910129421 CN101841749B (en) | 2009-03-18 | 2009-03-18 | Data transmission method, communication device and communication system |
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| CN 200910129421 CN101841749B (en) | 2009-03-18 | 2009-03-18 | Data transmission method, communication device and communication system |
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