CN1681233B - Realizing method of data multiplexing and virtual form - Google Patents
Realizing method of data multiplexing and virtual form Download PDFInfo
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- CN1681233B CN1681233B CN 200410033174 CN200410033174A CN1681233B CN 1681233 B CN1681233 B CN 1681233B CN 200410033174 CN200410033174 CN 200410033174 CN 200410033174 A CN200410033174 A CN 200410033174A CN 1681233 B CN1681233 B CN 1681233B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
Abstract
The method includes following steps: with band width of continuous data to be transmitted, determines holder group with adaptation volume comprising different class holders; the relevant holder in the holder group is inserted into data of continuous data band width service. The virtual cascade connection method is to use the data multiplexing method to multiplex the continuous data band width service into the holder, and to add virtual cascaded message into relevant virtual holder, and to transmit virtual cascaded message by using virtual cascaded way. At reception end, with the virtual cascaded message, the data of continuous band width service transmitted in virtual holder above can be received.
Description
Technical field
The present invention relates to the optical communication technique field, refer to the implementation method of data multiplex and Virtual Concatenation in a kind of SDH (synchronous digital hierarchy) network especially.
Background technology
SDH carries out the transmission of synchronizing information, multiplexing and interconnection as a kind of signal transmission fundamental mode on channel.The SDH signal transmits with the form of STM (synchronous transfer mode), and the standard speed value is 155.520Mbits/s (STM-1), 622.080Mbits/s (STM-4) and 2488.320Mbits/s (STM-16) etc.SDH adopts the rectangular block shape frame structure based on byte structure, and it is made up of 270 * N row, 9 row, 8 bit bytes, wherein N=1,4,16 or 64.The SDH frame structure is made up of information payload (PayLoad), section overhead (SOH) and three zones of Administrative Unit Pointer (AU PTR), wherein, the information payload district comprises various information modules to be transmitted and is used for the path overhead byte (POH) that channel performance monitors, manages and control: the SOH district is positioned at 1～9 * N row, 1～3,5～9 row comprise for the network operation, administer and maintain the byte of use; AU PTR is a kind of designator, is positioned at frame 1～9 * N row, and 4 go, and are used to indicate the position of first byte in frame of message payload.
Virtual container VCn (n=11,12,2,3,4) is a kind of message structure among the SDH, form by information payload and path overhead (POH), VC11, VC12, VC2 and VC3 are called Lower Order Virtual Container because sign indicating number speed is low, and VC4 is called higher order virtual container because sign indicating number speed is higher.AU-n is the another kind of message structure among the SDH, and it is made up of a higher order virtual container and a corresponding Administrative Unit Pointer.
In the SDH network, cascade is widely used, and cascade is to go up a kind of data map technology that realizes at MSTP (integrated service delivery platform), and it can be with a plurality of virtual container set altogether.As a single container use that keeps the bit sequence integrality, realize the transmission of services of large granularities, the great advantage of cascade has improved the bandwidth availability ratio of transmission system when being carrying multi-service (mainly being data service).
Cascade is divided into Adjacent Concatenation and Virtual Concatenation, and Adjacent Concatenation is that adjacent virtual container in the same STM-N Frame is cascaded into the C-4/3/12-Xc form, transmits as an overall structure; The advantage of Adjacent Concatenation is that the business that it transmits is an integral body, and the various piece of data does not produce time delay, the signal transmission quality height.
But, there is certain limitation in the application of Adjacent Concatenation mode, its requires all-network, the node of professional process all to support the Adjacent Concatenation mode, if relate to the situation of mixing application with the former network equipment, existing equipment then possibly can't be supported Adjacent Concatenation so, thereby can't realize omnidistance business transmission.At this moment, can adopt the Virtual Concatenation mode to finish the transmission of cascade business.
Virtual Concatenation is to be distributed in virtual container in the different STM-N Frames (can same route or different route), method according to cascade, form a virtual macrostructure VC-4/3/12-Xv form, transmit, it is separately independently transmitting continuous data bandwidth among the VC-X, these VC are combined at the terminal point that transmits again and obtain continuous bandwidth.Realize adaptive between service bandwidth and the SDH virtual container utilizing the SDH link bandwidth better by Virtual Concatenation, improved transmission efficiency than Adjacent Concatenation.
But still there is following shortcoming in the existing technology of Virtual Concatenation that realizes:
In the existing Virtual Concatenation implementation, can only be that other virtual container of speed level of the same race carries out Virtual Concatenation, for example ITU-T has defined the Virtual Concatenation mode of three kinds of single virtual containers of VC-4/3/12-Xv, but data service is more and more, amount of bandwidth differs, adopt the virtual container of single-rate grade to carry out Virtual Concatenation, deficiency is all arranged on bandwidth usage all the time, for example, if the data service bandwidth that needs to transmit is 160Mbps, shine upon as using VC4, because the capacity of VC4 virtual container is 139.264Mbps, adopt the Virtual Concatenation technology with 2 VC4 cascades together, capacity is 278.528Mbps altogether, obviously relatively waste; As if using VC3 to shine upon, then, then need together 4 VC3 cascades because the capacity of VC3 virtual container is 44.736Mbps, capacity is 178.944Mbps altogether, waste 18.944Mbps, Billy VC4 Virtual Concatenation utilance height; Further, also can adopt VC12 to shine upon,, then need 80 VC12 cascades just can meet the demands together, only waste 3.84Mbps because C12 virtual container capacity is 2.048Mbps.But allow 64 VC12 cascades together at most in the VC12 virtual concatenation protocol, so in these cases, still can't adopt the VC12 Virtual Concatenation.Obviously, adopt present Virtual Concatenation implementation, under many circumstances, the flexibility of mapping and bandwidth utilization have been subjected to very big restriction, remain further to be improved.
Summary of the invention
The technical problem that the present invention solves provides a kind of data multiplex flexible, that bandwidth availability ratio is high and implementation method of Virtual Concatenation of shining upon, and adopts said method, and the flexibility of mapping and bandwidth utilization are further improved.
For addressing the above problem, the method for a kind of data multiplex provided by the invention may further comprise the steps:
First determining step: the container group that comprises the different brackets container of determining adaptive capacity according to the bandwidth of continuous data band width service to be transmitted;
The first multiplexing step: described data of continuous data band width service is interleave the corresponding container that is multiplexed in the described container group.
Wherein, the described first multiplexing step specifically comprises:
A) determine to interleave in each container frame structure of container group the total capacity of the corresponding line that is multiplexed into data;
B) data of continuous data band width service that will be to be transmitted is divided into the data segment of plurality of continuous, and described continuous data segment bandwidth adaptation is in described total capacity;
C) determine to interleave in each container frame structure the capacity of the corresponding line that is multiplexed into data;
D) described data segment is divided into the data section of corresponding each container, described data section bandwidth adaptation is in described capacity;
E) the sub-segment data of described each data is interleave multiplexingly advance in the corresponding container.
Further, described step e) further comprises:
E1) determining that each data is intersegmental inserts the multiplexing byte number that advances the corresponding container data;
E2) data of respective byte number in each data section are interleave multiplexingly to advance in the cell therefor according to the order of sequence.
In addition, described container comprises C2, C3, C4, C11 and C12.
Accordingly, the invention provides a kind of implementation method of Virtual Concatenation, may further comprise the steps:
Second determining step: the container group that comprises the different brackets container of determining adaptive capacity according to the bandwidth of continuous data band width service to be transmitted;
The second multiplexing step: described data of continuous data band width service is interleave the corresponding container that is multiplexed in the described container group;
Mapping step: described container is added that the expense that comprises Virtual Concatenation information is mapped as the virtual container of respective rate grade;
Transfer step: described virtual container is sent out according to the Virtual Concatenation mode;
Receiving step: receive the data of continuous data band width service that described virtual container transmits according to described Virtual Concatenation information receiving end.
Wherein, the described second multiplexing step specifically comprises:
1) determines to interleave in each container frame structure of container group the total capacity of the corresponding line that is multiplexed into data;
2) data of continuous data band width service that will be to be transmitted is divided into the data segment of plurality of continuous, and described continuous data segment bandwidth adaptation is in described total capacity;
3) determine to interleave in each container frame structure the capacity of the corresponding line that is multiplexed into data;
4) described data segment is divided into the data section of corresponding each container, described data section bandwidth adaptation is in described capacity;
5) the sub-segment data of each data is interleave multiplexingly to advance in the corresponding container according to the order of sequence.
In addition, described step 5) further comprises:
51) determining that each data is intersegmental inserts the multiplexing byte number that advances the data of corresponding container;
52) according to the order of sequence the data multiplex of respective byte number in each data section is advanced in the corresponding container.
In addition, described virtual container comprises two or more among VC2, VC3, VC4, VC11 and the VC12, and the Virtual Concatenation information of wherein said VC3, VC4 transmits by the H4 byte, and the Virtual Concatenation information of VC11, VC12 and VC2 transmits by the K4 byte.
Concrete, described Virtual Concatenation information is multiple frame number and virtual container sequence number.
Best, described Virtual Concatenation mode is the Virtual Concatenation of VC3 and/or VC4 and VC11 and/or VC12 and/or the combination of VC2 virtual container, before in the mapping step VC11/VC12/VC2 sequence number being arranged in.
Best, described Virtual Concatenation mode is the Virtual Concatenation of VC3 and/or VC4 and VC11 and/or VC12 and/or the combination of VC2 virtual container, then further expand VC11/VC12/VC2 shine upon into VC3 and/or VC4 in the multi-frame indication of H4 byte as the Virtual Concatenation multi-frame indication of the VC11/VC12/VC2 of Virtual Concatenation.
Best, described Virtual Concatenation mode is the Virtual Concatenation of VC3 and the combination of VC4 virtual container.
Best, described Virtual Concatenation mode is the Virtual Concatenation of any virtual container combination of VC11, VC12 and VC2.
Compared with prior art, the present invention has the following advantages:
1, the present invention is according to the amount of bandwidth of continuous data band width service, select the container of different brackets to load, data map is multiplexing more flexible, if be applied in the Virtual Concatenation, owing to can select the virtual container transmission of different rates grade according to the bandwidth of continuous data band width service, can improve the flexibility ratio of professional mapping in the Virtual Concatenation, enrich the particle of the professional mapping of Virtual Concatenation.
2, further, the present invention is according to the service bandwidth size, and the virtual container of selecting to adapt to the different rates grade of respective bandwidth carries out Virtual Concatenation, can improve bandwidth utilization, avoids the waste of the bandwidth that prior art single-rate grade virtual container Virtual Concatenation causes.
Description of drawings
Fig. 1 is a VC3/VC4 frame structure schematic diagram in the prior art;
Fig. 2 is a VC11/VC12/VC2 frame structure schematic diagram in the prior art;
Fig. 3 is the preferred embodiment flow chart that in the data multiplexing method of the present invention data multiplex is advanced container;
Fig. 4 is a data multiplexing method specific embodiment data multiplex schematic diagram of the present invention;
Fig. 5 is the implementation method embodiment flow chart of Virtual Concatenation of the present invention;
Fig. 6 is the preferred embodiment flow chart that among the embodiment of Fig. 5 data multiplex is advanced container;
Fig. 7 is the implementation method specific embodiment VC11 of Virtual Concatenation of the present invention and the data multiplex schematic diagram of VC12 Virtual Concatenation transmission data;
Fig. 8 is the implementation method specific embodiment VC3 of Virtual Concatenation of the present invention and the first trip data multiplex schematic diagram of VC12 Virtual Concatenation transmission data;
Fig. 9 is the implementation method specific embodiment VC3 of Virtual Concatenation of the present invention and the multiplexing schematic diagram of other line data of VC12 Virtual Concatenation transmission data.
Embodiment
The present invention is applied in the SDH network, shine upon the into method of virtual container by improving data of continuous data band width service, and then realize a kind of new Virtual Concatenation mode, can improve the flexibility ratio of professional mapping, the particle of abundant business mapping, and further improve bandwidth utilization, make the service bandwidth distribution of transfer of data reach best.
For being more conducive to understand inventive concept, simply introduce earlier container in the prior art/virtual container frame structure and relevant Virtual Concatenation technology, with reference to figure 1, Fig. 2, Fig. 1 is a virtual container VC3/VC4 frame structure schematic diagram, Fig. 2 is a virtual container VC11/VC12/VC2 frame structure schematic diagram, and the frame structure of the virtual container of above-mentioned each speed grade is identical with definition in the agreement G.707.Concrete, the basic structure of VC3 and VC4 is identical, and what of payload are its main distinction be, and wherein VC4 is 261 row * 9 row payloads, and VC3 is 85 row * 9 row; VC11, VC12 and VC2 basic structure all are the structures of 9 row too, just the payload size difference.
Prior art transmits Virtual Concatenation information by the H4 byte in VC3, VC4, H4 byte meaning reference table 1
Table 1
In the H4 byte, significant mainly is three: answer frame number (8bit) greatly, little multiple frame number (4bit) and sequence number (8bit).Can regard frame number and little multiple frame number greatly again as a multi-frame indication together, the multi-frame indication is the delay time foundation of alignment of receiving terminal, and the amount of capacity of multi-frame directly influences the ability that transmits the data time-delay.So ITU-T has defined the multi-frame indication of 12bit, is divided into two sections transmission, be respectively big frame number again and little multiple frame number.The low 4bit of H4 byte is little multiple frame number, and the high 4bit of correspondence is respectively the MSB (high 4bit) and the LSB (low 4bit) of big frame number again when the value of low 4bit is 0 and 1.Multi-frame indication in the Virtual Concatenation can be regarded as the frame flag of transmission, has been used for indicating which frame of present transmission, and the frame that the same moment sends should have identical multiple frame number.
And in VC12, VC11, then the bit6 by the K4 byte represents Virtual Concatenation information, and meaning is as shown in table 2:
Table 2
From the frame structure of Fig. 2 VC12/VC11 as can be seen, a complete VC11/VC12 frame is 500us, and wherein the K4 byte is an overhead byte.Because the overhead byte of VC11/VC12 is very few, so each overhead byte all has several meanings, relevant with the Virtual Concatenation bit6 that has only in the K4 byte, as shown in table 2, the bit6 of 32 K4 bytes of continuous 32 frames forms a complete Virtual Concatenation information, is used to represent sequence number and multiple frame number, and wherein bit1～bit5 is multiple frame number, bit6～bit11 is a sequence number, identical in the effect of multiple frame number and sequence number and meaning and the H4 byte.
In the SDH net, business for continuous bandwidth, the data multiplexing technique that adopts can select the single information container of the suitable grade of adaptive capacity to load according to this professional amount of bandwidth now, for example can select information container C12 to load for the tributary signal of 2.048Mbit/s, and can select information container C3 to load for the data of 34.368Mbit/s and 44.736Mbit/s, an also optional majority low order container C 11 or C12 load, and further mapping is multiplexed into the high-order container transport.Because the single container of available technology adopting loads data of continuous data band width service, professional mapping is dull, and data multiplex can't make full use of bandwidth resources, and for this reason, the present invention proposes a kind of new data multiplexing method, and it mainly adopts following two steps:
The first step is determined the container group that comprises the different brackets container of adaptive capacity according to the bandwidth of continuous data band width service to be transmitted;
Because in the SDH network, each container struck capacity difference, if adopt single container to load data of continuous data band width service, then may there be the bandwidth waste situation, for example professional continuous data bandwidth is 100Mbps, if use C4 to load this business datum, because the capacity of C4 container is 139.264Mbps, then will waste the bandwidth resources of 39.264Mbps, if and adopt the container combined shipment of different brackets, by the appropriate combination container, bandwidth waste is reduced, therefore, in the data multiplexing method of the present invention, determine to comprise the container group of different brackets container according to the bandwidth of continuous business, the total capacity of this container group should with the bandwidth adaptation of continuous business to load this business datum, it for example is the business of 100Mbps for the continuous data bandwidth, can select 2 container C 3, adding 5 C12 containers loads, because the C3 container capacity is approximately 45Mbps, the C12 container capacity is approximately 2Mbps, the capacity of such 2 C3 containers, the capacity of adding 5 C12 containers is approximately 100Mbps, like this will can waste bandwidth.
In second step, data of continuous data band width service is interleave the corresponding container that is multiplexed in the described container group.
The above-mentioned first step has been determined the corresponding container of loading data according to the bandwidth of continuous data band width service, can adopt in this step and interleave multiplexing method and advance cell therefor with the business datum of above-mentioned continuous bandwidth is multiplexing, because the total capacity and the service bandwidth of container group are adaptive, bandwidth waste is further reduced, specifically each container that data multiplex is advanced in the container group can adopt the whole bag of tricks, preferred embodiment describe with a kind of below, concrete, the frame structure of considering various containers in the SDH network mostly is the block frame structure of 9 row, can adopt capable multiplex mode, with reference to figure 3, a kind ofly preferred embodiment adopt following step process data:
At step s31, determine to interleave in each container frame structure of container group the total capacity of the corresponding line that is multiplexed into data;
At step s32, data of continuous data band width service to be transmitted is divided into the data segment of plurality of continuous, described continuous data segment bandwidth adaptation is in described total capacity;
At step s33, determine to interleave in each container frame structure the capacity of the corresponding line that is multiplexed into data;
At step s34, described data segment is divided into the data section of corresponding each container, described data section bandwidth adaptation is in described capacity;
At step s35, the sub-segment data of described each data is interleave multiplexingly to advance in the corresponding container.Finish the data multiplex process.
Above-mentioned data segment bandwidth can be the data capacity summation of delegation in each virtual container frame structure of Virtual Concatenation transmission, it also can be the data capacity summation of multirow, same, the data capacity of delegation also can be the data capacity of multirow in each virtual container frame structure that described data section bandwidth can be a correspondence; Described in addition data section, it can be the continuous data section of continuous bandwidth in the described data segment, it also can be data section (promptly being distributed in the non-continuous data section in the data segment) in logic, in step s35, advance in the corresponding container to adopt multiple mode with described data section is multiplexing, for example can be according to the order of sequence directly in whole section multiplexing corresponding line that advances corresponding container with continuous data section, can determine further also that each data is intersegmental and insert the multiplexing byte number that advances the data of corresponding container, according to the order of sequence the data of respective byte number in each data section be interleave then and multiplexingly advance in the cell therefor.
Describe for example below, with reference to figure 4, continuous data band width service with a multiplexing 185Mbps bandwidth describes, at first determine the container group of loading data, as optional example, for example select a container C 3 to add that the container assembling of a container C 4 carries, because C4 and C3 are the frame structures of 9 row, in delegation, C4 has 260 payloads, C3 has 84, the data segment that the 185Mbps bandwidth can be divided into the individual bytes of payload of 344 (260+84) continues described data segment to be divided into a data section of 260 bytes of payload and the data section of 84 payloads then, and described data section can be continuous data section, for example in 344 bytes of payload, preceding 260 successive byte payloads are as the data section of corresponding C4 container, and 84 the successive byte payloads in back are as the data section of corresponding C3 container, when multiplexing, once directly advance in the C4 container 260 bytes of payload of corresponding C4 container are multiplexing, advance in the C3 container 84 bytes of payload of corresponding C3 container are once directly multiplexing simultaneously.
As other optimal ways that can implement, the data section of corresponding each container can be discontinuous data section, then can further divide the multiplexing byte number that advances corresponding container of each data section, then the data of respective byte number in the data section are interleave multiplexingly to advance in the corresponding container, for example, consider that C4 container and C3 container capacity are 3 times+8 relations, every multiplexing 3 data are advanced C4, then multiplexing data are advanced C3, to C3 one provisional capital multiplexing intact after, C4 is with regard to multiplexing 252 data, at this moment more continuously multiplexing 8 data advance C4 to finish delegation multiplexing, proceed the multiplexing of next line, every provisional capital is adopted in a like fashion and carried out, and is all multiplexing intact up to data.Business for reality, obviously can not have the container of coupling fully, also be that the total capacity of selected container group can then can add byte of padding for part vacant in the container so suitably greater than the continuous data bandwidth of reality, owing to be not key of the present invention, no longer carefully state here.
The following describes the implementation method of Virtual Concatenation of the present invention.
There is the problem of bandwidth waste in the single virtual container Virtual Concatenation transmission of prior art, for overcoming this problem, can utilize above-mentioned data multiplexing method that data are loaded in the different vessels, transmit in the Virtual Concatenation mode then, like this, can reduce the waste of bandwidth, with reference to figure 5, the implementation method of Virtual Concatenation transmission of the present invention is described in detail in detail below, concrete, mainly may further comprise the steps:
At step s51, determine the container group that comprises the different brackets container of adaptive capacity according to the bandwidth of continuous data band width service to be transmitted;
At step s52: data of continuous data band width service is interleave the corresponding container that is multiplexed in the described container group;
At step s53: described container is added that the expense that comprises Virtual Concatenation information is mapped as the virtual container of respective rate grade;
At step s54: described virtual container is sent out according to the Virtual Concatenation mode;
At step s55: receive the data of continuous data band width service that described virtual container transmits according to described Virtual Concatenation information receiving end.
Utilized the data multiplexing method (being step s51, s52) of the invention described above in the above-mentioned Virtual Concatenation implementation method, with identical in the data multiplexing method, when specifically data multiplex being advanced each container loading, for various container combination, preferably adopt the multiplexing mode of row, when being convenient to receive like this data demultiplexing is come out, concrete, be performing step s52,, adopt the method for following optimization with reference to figure 6:
At step s521: the total capacity of determining to interleave in each container frame structure of container group the corresponding line that is multiplexed into data;
At step s522: data of continuous data band width service that will be to be transmitted is divided into the data segment of plurality of continuous, and described continuous data segment bandwidth adaptation is in described total capacity;
At step s523: the capacity of determining to interleave in each container frame structure the corresponding line of multiplexing described data field data;
At step s524: described data segment is divided into the data section of corresponding each container, and described data section bandwidth adaptation is in described capacity;
At step s525: the sub-segment data of described each data interleave multiplexingly advance in the corresponding container.
Because SDH is that unit handles with the byte,, also can further determine the intersegmental slotting multiplexing byte number that advances the data of corresponding container of each data for step s525; According to the order of sequence the data multiplex of respective byte number in each data section is advanced in the corresponding container then.
Below with different virtual container combination illustrated in greater detail.
1, the isostructural Virtual Concatenation of VC3/VC4 is realized
With reference to figure 7, the mixing Virtual Concatenation of VC3 and VC4 is similar substantially with present single container Virtual Concatenation.At first need to determine the VC3 and the VC4 time slot of Virtual Concatenation transmission, distribute the due sequence number of each time slot by webmaster then, size according to sequence number is carried out data map in order, not having distributed time slot then not carry out the mapping of data, the information of Virtual Concatenation---multiple frame number and sequence number are included among the overhead byte H4 of each VC4 and VC3.
In data map is conciliate mapping process, earlier multiplexingly advance C3 and C4, C3 adds that expense becomes VC3 then, C4 adds that expense becomes VC4, carries out next step mapping according to the mapping structure that G.707 defines again.
2, the isostructural Virtual Concatenation of VC11/VC12 is realized
The mixing Virtual Concatenation transmission of VC12 and VC11 is similar with present single container Virtual Concatenation transmission basic structure, at first determine to carry out the VC12 and the VC11 time slot of Virtual Concatenation transmission, distribute the due sequence number of each time slot by webmaster then, size according to sequence number is carried out data map in order, does not have distributed time slot then not carry out the mapping of data.The information of Virtual Concatenation---multiple frame number and sequence number are included among the overhead byte K4 of each VC11 and VC12.
Multiplexing the same with the blended data of C3, C4, C11 and C12 be delegation of delegation multiplexing preferably, and except the 9th row, 1 byte Duo than C11 in the every provisional capital of C12, so carrying out preceding 8 capablely when multiplexing, continuous two the multiplexing C12 of advancing of byte of data can occur; And the 9th row, because many byte of paddings of C12 so the payload of C12 and C11 is the same, all are 2 bytes, so that data multiplex advances C3 is identical with C4, the data multiplex process can be with reference to figure 7.
3, the Virtual Concatenation of different structure is realized
The Virtual Concatenation of different structure is realized and existing Virtual Concatenation is realized having more different, mainly be meant the different structure combination of VC3 and/or VC4 and VC11 and/or VC12 and/or VC2, implementation with VC3 and VC12 Virtual Concatenation is an example below, is divided into transmitting terminal and receiving terminal describes respectively.
Transmitting terminal:
1) amount of bandwidth of carrying out the continuous data band width service of Virtual Concatenation transmission is as required selected container.With the 100M business is example, and the container size of C3 is about 45M, and the container size of C12 is about 2M, like this, selects the container of 2 C3, and the container of 5 C12 gets final product;
2), promptly determine size and the order of SQ (sequence number) for selected virtual container is numbered.The sequence number range of considering VC12/VC11 is less, and the layout of sequence number is only VC3/VC4 then from VC11/VC12, and for example 1) in, the sequence number of 5 C12 containers is that the sequence number of 0～4,2 C3 containers is 5～6;
3) according to sequence number and multiple frame number data of continuous data band width service is shone upon into corresponding virtual container respectively.
Because first row and last provisional capital of C12 have only 2 effective payloads, other provisional capital is 4, so first row is identical as Fig. 8 with the data multiplex mode of last column, and middle 7 line data multiplex modes are identical as Fig. 9.
Among the present invention, for the virtual container that mixes Virtual Concatenation, aspect the layout of multiple frame number, the every 125us of VC3 structure, the multi-frame counting of H4 byte adds 1; VC12 determines multiple frame number by secondary.
According to the multiple frame number definition mode of VC3, we also are called little multi-frame (MF1) and big multi-frame (MF2) respectively with this two-stage multi-frame of VC12.The first order, the low 2bit that shines upon the H4 byte (multi-frame indication byte) of VC3 into according to VC12 determines the multiple frame number (being MF1) of lowermost level.In the higher level of VC12/VC11 mapping, TUG-2 is advanced in mapping earlier---and on the basis of VC12, add the pointer indication, can shine upon into VC3 or TUG3 then and arrive VC4 again.Like this, the words of the mapping of VC12/VC11 have been selected, higher level's VC3 or VC4 can not be Virtual Concatenations just, their expense H4 byte just no longer is the content of Virtual Concatenation definition like this, but the multi-frame of VC12/VC11 indication byte, the multi-frame indication of the indication of the multi-frame here in neither Virtual Concatenation, but the indication of the multi-frame of 500us.At this moment, the H4 byte has only bit0 and bit1 meaningful, represents the 1st 125us of first subframe in the 500us multi-frame when being 00, represents the 2nd 125us of second subframe in the 500us multi-frame when being 01, when being 10, represent the 3rd 125us, represented the 4th 125us at 11 o'clock.In fact, such definition and the indication of the multi-frame in Virtual Concatenation purposes are basically identicals, when so the present invention realizes mixing Virtual Concatenation, expansion VC3 (or VC4, the further mapping that depends primarily on VC12 is that VC3 or VC4 are advanced in mapping, VC3 is advanced in VC 12 mapping in the present embodiment) the multi-frame indication byte of H4 byte (do not have this notion of little multi-frame in the Virtual Concatenation definition of original VC11/VC12 as the little multi-frame of VC11/VC12, have only this multi-frame counting of FrameCounter), be used to realize the indication of Virtual Concatenation multi-frame.Because Virtual Concatenation need be received multiple frame number and just begin to separate mapping (enum) data, is just to have the bigger stand-by period so carry out Virtual Concatenation separately at VC11/VC12, cause the time-delay of data transfer procedure very big.And if it also just has a multiple frame number (being the indication of duplicating of the H4 byte expanded of the present invention) at every 125us, just can be the same with VC3/VC4, waiting for that 125us just can separate has shone upon, and has significantly reduced processing and has delayed time.Also further determine the frame number of each concrete frame in the multi-frame in addition when separating mapping, also promptly determine the multiple frame number in the second level (promptly big frame number again) according to the multiple frame number of K4 byte, this is identical with present Virtual Concatenation definition, no longer describes in detail.
At receiving terminal:
At first, determine delay inequality according to multiple frame number, the virtual container of each different structure in the same virtual cascade group of aliging, described virtual container may be the Virtual Concatenations of VC3/VC4 and VC11VC12, also may be the Virtual Concatenations of VC3, VC4 and VC11/VC12.
Further, to the virtual container in same virtual cascade group ordering, recover data then, produce corresponding frame number, sequence number, the time-delay again alarm that goes beyond the scope according to sequence number.
It is above-mentioned that only the present invention will be described with preferred embodiment, non-so promptly limit to interest field of the present invention, therefore, under the situation that does not break away from inventive concept, the equivalence that all utilizations specification of the present invention and accompanying drawing content are done changes, and all reason is with being contained in the claim scope of the present invention.
Claims (13)
1. a data multiplexing method is applied to it is characterized in that in the synchronous digital hierarchy network, may further comprise the steps:
First determining step: the container group that comprises the different brackets container of determining adaptive capacity according to the bandwidth of continuous data band width service to be transmitted;
The first multiplexing step: described data of continuous data band width service is interleave the corresponding container that is multiplexed in the described container group.
2. according to the described data multiplexing method of claim 1, it is characterized in that the described first multiplexing step specifically comprises:
A) determine to interleave in each container frame structure of container group the total capacity of the corresponding line that is multiplexed into data;
B) data of continuous data band width service that will be to be transmitted is divided into the data segment of plurality of continuous, and described continuous data segment bandwidth adaptation is in described total capacity;
C) determine to interleave in each container frame structure the capacity of the corresponding line that is multiplexed into data;
D) described data segment is divided into the data section of corresponding each container, described data section bandwidth adaptation is in described capacity;
E) the sub-segment data of described each data is interleave multiplexingly advance in the corresponding container.
3. according to the described data multiplexing method of claim 2, it is characterized in that described step e) further comprises:
E1) determining that each data is intersegmental inserts the multiplexing byte number that advances the data of corresponding container;
E2) data of respective byte number in each data section are interleave multiplexingly to advance in the cell therefor according to the order of sequence.
4. according to claim 1,2 or 3 each described data multiplexing methods, it is characterized in that described container comprises C2, C3, C4, C11 and C12.
5. the implementation method of a Virtual Concatenation is applied to it is characterized in that in the synchronous digital hierarchy network, may further comprise the steps:
Second determining step: the container group that comprises the different brackets container of determining adaptive capacity according to the bandwidth of continuous data band width service to be transmitted;
The second multiplexing step: described data of continuous data band width service is interleave the corresponding container that is multiplexed in the described container group;
Mapping step: described container is added that the expense that comprises Virtual Concatenation information is mapped as the virtual container of respective rate grade;
Transfer step: described virtual container is sent out according to the Virtual Concatenation mode;
Receiving step: receive the data of continuous data band width service that described virtual container transmits according to described Virtual Concatenation information receiving end.
6. according to the implementation method of the described Virtual Concatenation of claim 5, it is characterized in that the described second multiplexing step specifically comprises:
1) determines to interleave in each container frame structure of container group the total capacity of the corresponding line that is multiplexed into data;
2) data of continuous data band width service that will be to be transmitted is divided into the data segment of plurality of continuous, and described continuous data segment bandwidth adaptation is in described total capacity;
3) determine to interleave in each container frame structure the capacity of the corresponding line that is multiplexed into data;
4) described data segment is divided into the data section of corresponding each container, described data section bandwidth adaptation is in described capacity;
5) the sub-segment data of each data is interleave multiplexingly to advance in the corresponding container according to the order of sequence.
7. according to the implementation method of the described Virtual Concatenation of claim 6, it is characterized in that described step 5) further comprises:
51) determining that each data is intersegmental inserts the multiplexing byte number that advances the data of corresponding container;
52) according to the order of sequence the data multiplex of respective byte number in each data section is advanced in the corresponding container.
8. according to the implementation method of the described Virtual Concatenation of claim 5, it is characterized in that, described virtual container comprises two or more among VC2, VC3, VC4, VC11 and the VC12, the Virtual Concatenation information of wherein said VC3, VC4 transmits by the H4 byte, and the Virtual Concatenation information of VC11, VC12 and VC2 transmits by the K4 byte.
9. the implementation method of described Virtual Concatenation according to Claim 8 is characterized in that, described Virtual Concatenation information is multiple frame number and virtual container sequence number.
10. according to the implementation method of each described Virtual Concatenation of claim 5-9, it is characterized in that, described Virtual Concatenation mode is the Virtual Concatenation of first virtual container and second virtual container, wherein, first virtual container is VC3 and/or VC4, second virtual container is VC11 and/or VC12 and/or VC2, before in the mapping step VC11/VC12/VC2 sequence number being arranged in.
11. implementation method according to the described Virtual Concatenation of claim 10, it is characterized in that, described Virtual Concatenation mode is the Virtual Concatenation of first virtual container and second virtual container, wherein, first virtual container is VC3 and/or VC4, second virtual container is VC11 and/or VC12 and/or VC2, then further expand VC11/VC12/VC2 shine upon into VC3 and/or VC4 in the multi-frame indication of H4 byte as the Virtual Concatenation multi-frame indication of the VC11/VC12/VC2 of Virtual Concatenation.
12. the implementation method according to each described Virtual Concatenation of claim 5-9 is characterized in that, described Virtual Concatenation mode is the Virtual Concatenation of VC3 and the combination of VC4 virtual container.
13. the implementation method according to each described Virtual Concatenation of claim 5-9 is characterized in that, described Virtual Concatenation mode is the Virtual Concatenation of any virtual container combination of VC11, VC12 and VC2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410033174 CN1681233B (en) | 2004-04-09 | 2004-04-09 | Realizing method of data multiplexing and virtual form |
| PCT/CN2005/000464 WO2005099149A1 (en) | 2004-04-09 | 2005-04-08 | Method for implementing data multiplex and virtual concatenation |
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| CN 200410033174 CN1681233B (en) | 2004-04-09 | 2004-04-09 | Realizing method of data multiplexing and virtual form |
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| CN1681233A CN1681233A (en) | 2005-10-12 |
| CN1681233B true CN1681233B (en) | 2010-12-08 |
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| CN111555844B (en) * | 2020-05-14 | 2023-07-28 | 北京中科网维科技有限公司 | Method and device for automatically identifying VC3/VC4 virtual concatenation GFP protocol |
| CN114466087B (en) * | 2022-02-21 | 2023-05-30 | 重庆奥普泰通信技术有限公司 | Data transmission method, device, equipment and storage medium |
Citations (4)
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|---|---|---|---|---|
| EP0993135A2 (en) * | 1998-10-06 | 2000-04-12 | Nortel Networks Corporation | Concatenation of containers in synchronous digital hierarchy network |
| CA2289897A1 (en) * | 1999-04-26 | 2000-10-26 | Nortel Networks Corporation | Multiplex hierarchy for high capacity transport systems |
| CN1274223A (en) * | 1999-04-22 | 2000-11-22 | 马科尼通讯有限公司 | Communicating system |
| CN1464691A (en) * | 2002-06-24 | 2003-12-31 | 华为技术有限公司 | Mapping and demapping method between data packet and SDH frame structure of Ethernet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6999470B2 (en) * | 2001-06-28 | 2006-02-14 | Nortel Networks Limited | Methods and apparatus for transmitting synchronous data |
| ATE281720T1 (en) * | 2001-07-02 | 2004-11-15 | Cit Alcatel | METHOD AND APPARATUS FOR ACHIEVED EXPANDABLE AND MANAGED BANDWIDTH FOR CONNECTIONS BETWEEN ASYNCHRONOUS LEVELS AND SYNCHRONOUS HIERARCHIC LEVELS IN A TELECOMMUNICATIONS NETWORK |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0993135A2 (en) * | 1998-10-06 | 2000-04-12 | Nortel Networks Corporation | Concatenation of containers in synchronous digital hierarchy network |
| CN1274223A (en) * | 1999-04-22 | 2000-11-22 | 马科尼通讯有限公司 | Communicating system |
| CA2289897A1 (en) * | 1999-04-26 | 2000-10-26 | Nortel Networks Corporation | Multiplex hierarchy for high capacity transport systems |
| CN1464691A (en) * | 2002-06-24 | 2003-12-31 | 华为技术有限公司 | Mapping and demapping method between data packet and SDH frame structure of Ethernet |
Non-Patent Citations (1)
| Title |
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| US 2003/0002530 A1,全文. |
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| CN1681233A (en) | 2005-10-12 |
| WO2005099149A1 (en) | 2005-10-20 |
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