CN101155006A - Method and apparatus for fixed velocity service transmission - Google Patents
Method and apparatus for fixed velocity service transmission Download PDFInfo
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- CN101155006A CN101155006A CNA200610063011XA CN200610063011A CN101155006A CN 101155006 A CN101155006 A CN 101155006A CN A200610063011X A CNA200610063011X A CN A200610063011XA CN 200610063011 A CN200610063011 A CN 200610063011A CN 101155006 A CN101155006 A CN 101155006A
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Abstract
The present invention relates to the communication transmitting field, especially relates to a method which is suitable for the fixed-speed business transmitting in the transmitting system of the OTN (optical transport network) and the device. The invention judges whether the available net loading area of the transmitting frame can support the fixed-speed business by confirming the bite number of the fixed-speed business which is received in the transmitting frame period, maps the multiplex fixed-speed business distributedly to the transmitting frame, realizes the transmitting to the unknown fixed-speed business and uses the net loading area of the transmitting frame to maximum; meanwhile the invention need not analyze and process the business agreement and can realize the transparent transmitting of the business.
Description
Technical field
The present invention relates to field of communication transmission, refer to the method and apparatus that the fixed velocity service on a kind of transmission system that is applicable to optical transfer network OTN (Opticaltransport network, optical transfer network) transmits especially.
Background technology
Along with the continuous development in data communication market, the SDH of current extensive use (SynchronousDigital Hierarchy, SDH (Synchronous Digital Hierarchy)) more and more is not suitable for the data service of explosion type.SDH adopts time-division multiplex technology, provides the time division multiplexing of fixed-bandwidth to transmit passage, and mainly towards speech business, for data services, efficient is not high, is not suitable for the demand of following data service dramatic growth.
Above-mentioned demands of applications has been satisfied in optical transfer network OTN (Opticaltransport network, optical transfer network) the series suggestion that the ITU-T of international telecommunication union telecommunication standardization formulates greatly.The OTN technology comprises the technical specification of electricity layer photoreactive layer, can be good at compatible miscellaneous service interface, and the ability of managing each wavelength on every optical fiber is provided.G.709 suggestion is the standard of OTN network configuration and mapping aspect, and its core content has defined the OTN frame structure exactly.
The standard frame of OTN as shown in Figure 1.The OTN frame is 4080 * 4 modular construction, comprises frame alignment signal FAS (Frame Alignment Signal, frame alignment signal), and the function of frame synchronization location is provided.OTU (Optical Channel Transport Unit, Optical Channel Transport Unit-k) expense is the Optical Channel Transport Unit-k overhead byte, provides the Optical Channel Transport Unit-k level other Network Management Function.ODU (Optical Channel Data Unit) expense is the Optical Channel Data Unit-k overhead byte, and the maintenance and operation function is provided.OPU (Optical Channel Payload Unit, optical channel Payload Unit) expense is an optical channel Payload Unit overhead byte, and the client signal adapting function is provided.OPU is the optical channel Payload Unit, and the function of client signal carrying is provided.FEC (Forward Error Correction, forward direction error code correction) is the forward error correction byte, error detector is provided and corrects function.The OTN frame has defined three kinds of speed grade: 2.5Gbit/s, 10Gbit/s and 40Gbit/s altogether, can give full play to the oarse-grained advantage of OTN frame in the transmission of backbone network.
In G.709 advising, defined the mapping method of CBR (Constant bit rate, fixed bit rate) 2G5, CBR10G and CBR40G business, defined the mapping method of ATM and gfp frame simultaneously.Yet it is professional that these mapping methods are only applicable to speed fixed velocity service and bag as can be known, also inapplicable for the fixed velocity service of the unknown.
A kind of time slot of the prior art is divided and is realized fixed velocity service mapping scheme schematic diagram as shown in Figure 2.15,16 of OTN frame is classified the OPU expense as, and 17 to 3824 classify the OPU payload section as.The OPU payload section is carried out time slot divide, the four lines of each row is formed a time slot, is designated TS-1 successively, TS-2, and TS-3, up to TS-16, circulation successively then is up to whole OPU payload section is divided into 16 time slots.In professional certain time slot that can map directly in the OPU payload section, can support the mapping of STM-1/STM-4/STM-16/STM-64 business.
By above description as can be seen, prior art only at type of service be STM-1/STM-4/STM-16/STM-64, can't provide the mapping of unknown fixed velocity service, still, for the time that provides of new business is provided, telecom operators need the transmission of unknown fixed velocity service.
Summary of the invention
The invention provides the method and apparatus that a kind of fixed velocity service transmits, can be good at adapting to the networking demand of telecom operation at the mapping method of unknown fixed velocity service, having proposed does not a kind ofly need to divide fixedly time slot method and device, thereby has realized the maximum utilization to the transmission payload.
The invention provides the method that a kind of fixed velocity service transmits, comprising:
Step 1 is determined at the byte number that transmits fixed velocity service received in the frame period;
Step 2 is utilized the byte number of described fixed velocity service, judges whether the available payload section that transmits frame can carry described fixed velocity service, if can carry, then execution in step 3;
Step 3 converts the mapping priority of described fixed velocity service and the byte number of described fixed velocity service to can transmit frame format information in transmitting frame;
Step 4 is shone upon described frame format information to transmitting the frame overhead district;
Step 5 is shone upon described fixed velocity service and can be used payload section to transmitting frame, and sends the transmission frame.
Wherein, described step 2 further comprises,
If can not carry, then abandon the fixed velocity service that surpasses, finish the transmission of described fixed velocity service.
Wherein, described fixed velocity service comprises SDH/SONET business and Ethernet service, and described Ethernet service is meant and does not carry out the preceding fixed velocity service of 8B/10B decoding.
The device that the present invention also provides a kind of fixed velocity service to transmit comprises,
Professional byte computing module, carrying judging module, cache module, mapping control module, mapping cost insert module and transmission frame generation module;
Described professional byte computing module is used for calculating at the byte number that transmits the described fixed velocity service that the frame period receives;
Described carrying judging module, link to each other with described transmission frame generation module with described professional byte computing module, be used for byte number, judge whether the transmission frame in the described transmission frame generation module can carry described fixed velocity service with payload section according to described fixed velocity service;
Described cache module links to each other with described professional byte computing module, is used for the described carrying judge module of buffer memory and judges the fixed velocity service that can carry;
Described mapping control module, link to each other with described transmission frame generation module with described cache module, read by the described fixed velocity service that can carry is controlled, realize that the described fixed velocity service distributed mapping that can carry can use payload section to the transmission frame in the described transmission frame generation module;
Described mapping cost insert module links to each other with described transmission frame generation module with described professional byte computing module, is used for the byte number of described fixed velocity service is mapped to the transmission frame overhead district of described transmission frame generation module;
Described transmission frame generation module, link to each other with described cache module, described mapping control module and described mapping cost insert module, comprise described transmission frame payload section and described transmission frame overhead district, be used to deposit the described fixed velocity service that can carry, and generate complete transmission frame;
Wherein, described device further comprises the business interface module, and described business interface module links to each other with described described professional byte computing module, is used to receive described fixed velocity service.
Wherein, described device further comprises transmission frame sending module, and described transmission frame sending module links to each other with described transmission frame generation module, is used to send described complete transmission frame.The technical scheme that is provided by the invention described above as seen, by determining at the byte number that transmits fixed velocity service received in the frame period, judge whether the available payload section that transmits frame can carry fixed velocity service, multichannel fixed velocity service distributed mapping is gone into to transmit frame, realized the transmission of fixed velocity service.Because the present invention adopts distributed mapping method, the buffer memory that needs is very little; And professional payload does not need the encapsulation through third party's agreement, directly is mapped into payload section, has realized the transmission to unknown fixed velocity service, has utilized the payload section that transmits frame to greatest extent; The present invention does not simultaneously need service protocol is analyzed and handled, and can realize professional transparent transmission.
Description of drawings
Fig. 1 is an OTN frame structure schematic diagram;
Fig. 2 is that a kind of time slot is divided realization fixed velocity service mapping scheme schematic diagram;
Fig. 3 is a kind of multichannel fixed velocity service transfer system figure provided by the invention;
Fig. 4 is the method flow diagram that a kind of multichannel fixed velocity service provided by the invention transmits;
Fig. 5 is a professional byte distributed mapping flow chart provided by the invention;
Fig. 6 is a kind of multichannel fixed velocity service conveyer schematic diagram provided by the invention.
Embodiment
Below in conjunction with specific embodiment technical scheme of the present invention is described.
A kind of multichannel fixed velocity service transfer system figure provided by the invention as shown in Figure 3.
Business 1, business 2 and other professional multichannel interface cards through transmitting terminals insert, and the multichannel interface card is mapped to the transmission frame with the multichannel service integration.Described transmission frame mainly comprises SDH/SONET frame and OTN frame.The expense that wherein professional mapping produces is mapped to the overhead area that transmits frame, the professional payload area that transmits frame that is mapped to itself.Transmit frame and be linked into the transmission network by transfer equipment, send to receiving terminal through transmitting network, receive the transmission frame by the receiving terminal transfer equipment, again by the multichannel interface card demultiplexing business 1 of receiving equipment, professional 2 and other business, the multichannel interface card is finished the overhead extraction that professional mapping produces, and according to this Overhead reduction multichannel business.Wherein, described business comprises the business of some other fixed rates such as SDH/SONET business, Ethernet service, optical-fibre channel.
At multichannel interface card shown in Figure 3 method to the fixed velocity service mapping, at transmitting terminal, the method flow diagram that a kind of multichannel fixed velocity service provided by the invention transmits as shown in Figure 4.
Described rate business mainly comprises business such as SDH/SONET business and Ethernet, and wherein Ethernet service is meant and does not carry out the preceding fixed velocity service of 8B/10B decoding.
When the multichannel interface card inserts first via business, the whole payload area that transmits frame can both be as the available payload section of access service, insert the second the road when professional at the multichannel interface card, the whole payload section that transmits frame deducts the available payload section that payload section that first via business takies is the second tunnel business.The available payload section of other business of Jie Ruing is calculated according to this subsequently.
Determine the mapping priority of described fixed velocity service, and obtain the fixed velocity service byte number that described fixed velocity service inserts the transmission frame period of all service ports constantly.The mapping priority of this fixed velocity service is mainly determined according to the time sequencing of service access.The fixed velocity service byte number that obtains the transmission frame period of this fixed velocity service access all service ports constantly is can not have influence on this road business for the access that ensures other business.During first via service access, only obtain the professional byte number of biography frame period of first via business, other not the fixed velocity service byte number in the transmission frame period of access service port be 0; During the second tunnel service access, obtain the fixed velocity service byte number in the transmission frame period of the first via and the second tunnel business, other not the fixed velocity service byte number in the transmission frame period of access service port be 0; Other situations and the like.To shine upon the fixed velocity service byte number in the transmission frame period of priority and all service ports at last, convert the frame format that can in transmitting frame, transmit to, can adopt the multi-frame form, and perhaps adopt the error correcting code type to encode, guarantee the correctness that receives.
Each service port on the multichannel interface card all corresponding one transmit the frame overhead district, each service port all must be mapped to the fixed velocity service byte number in transmission frame period of all service ports the overhead area of transmission frame correspondence.
Mapping method mainly adopts distributed mapping method, is about to even distribution of fixed velocity service byte and is mapped to the available payload section that transmits frame.
In step 404, professional byte distributed mapping flow chart provided by the invention as shown in Figure 5.
At this moment, the fixed velocity service byte number in this port transmission frame period of multichannel interface card all is mapped to the transmission frame can be with in the payload section, and this port inserts the unappropriated transmission frame of fixed velocity service payload section byte can insert fixed velocity services use for other ports.
At receiving terminal, the multichannel interface card mainly provides a kind of method of recovering the multichannel fixed velocity service in transmitting frame.Mainly may further comprise the steps:
Step 701 receives described transmission frame, receives the mapping priority of each port fixed velocity service of multichannel interface card and transmit the fixed velocity service byte number in frame period from the overhead area that transmits frame.
Step 702, the mapping priority and the fixed velocity service byte number in transmission frame period according to each port fixed velocity service of multichannel interface card, according to transmitting terminal professional byte distributed mapping flow process shown in Figure 5, determine the byte deposit position of each port fixed velocity service of multichannel interface card, and, put into the corresponding buffer memory of each port with each port fixed velocity service byte taking-up.
Step 703, fixed velocity service byte number according to transmission frame period of each port fixed velocity service of multichannel interface card, reduce each port fixed velocity service clock,, call over the fixed velocity service byte in the corresponding buffer memory of each port of multichannel interface card by each port reduction clock.
A kind of multichannel fixed velocity service conveyer schematic diagram that the present invention also provides as shown in Figure 6.
Corresponding multichannel fixed velocity service, each road all has corresponding to the transmission flow path device of fixed velocity service to the transmission frame, comprise business interface module 600, professional byte computing module 601 and cache module 602, each road fixed velocity service will be unified to handle by transmitting frame generation module 603, multiple connection is one tunnel transmission frame signal, handles and sends by transmitting frame sending module 604 at last; Reversed in order then during reception.
During transmission, each road fixed velocity service at first receives fixed velocity services by business interface module 600, carries out sending fixed velocity service signal and clock signal to professional byte computing module 601 after business clock extracts.
Professional byte computing module 601 utilizes clock signal the fixed velocity service calculated signals to be transmitted the fixed velocity service byte number that receives in the frame period.
Carrying judging module 605 transmits the fixed velocity service byte number that receives in the frame period according to every road and judges whether transmit frame can carry with payload section, store if can carry then fixed velocity service is sent to cache module 602, if can not carry then abandon this business.
Mapping cost insert module 607 links to each other with transmission frame generation module 603 with professional byte computing module 601, is used for the byte number of fixed velocity service is mapped to the transmission frame overhead district of described transmission frame generation module
Fixed velocity service information in the cache module 602 on 606 pairs of every roads of mapping control module is controlled and is read, and adopts the data in the distributed mapping method mapping cache module can use payload section to the transmission frame that transmits frame generation module 603.Distributed mapping method is referring to Fig. 5 professional byte distributed mapping flow chart provided by the invention.
Transmit frame generation module 603, comprise and transmit the frame payload section and transmit the frame overhead district.Transmission frame generation module 603 will be inserted into the professional byte number of the overhead area that transmits the frame correspondence and control the business information that reads through mapping control module 606 and form complete transmission frame through mapping cost insert module 607 expenses, and the transmission frame that this is complete sends transmission frame sending module 604 to.
Transmit frame sending module 604 and finish line coding, also processing such as string conversion and opto-electronic conversion, transmit frame the most at last and send.
The technical scheme that is provided by the invention described above as seen, by determining at the byte number that transmits fixed velocity service received in the frame period, judge whether the available payload section that transmits frame can carry fixed velocity service, multichannel fixed velocity service distributed mapping is gone into to transmit frame, realized the transmission of fixed velocity service.Because the present invention adopts distributed mapping method, the buffer memory that needs is very little; And professional payload does not need the encapsulation through third party's agreement, directly is mapped into payload section, has realized the transmission to unknown fixed velocity service, has utilized the payload section that transmits frame to greatest extent; The present invention does not simultaneously need service protocol is analyzed and handled, and can realize professional transparent transmission.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (6)
1. the method that fixed velocity service transmits is characterized in that, comprises the steps:
Step 1 is determined at the byte number that transmits fixed velocity service received in the frame period;
Step 2 is utilized the byte number of described fixed velocity service, judges whether the available payload section that transmits frame can carry described fixed velocity service, if can carry, then execution in step 3;
Step 3 converts the mapping priority of described fixed velocity service and the byte number of described fixed velocity service to can transmit frame format information in transmitting frame;
Step 4 is shone upon described frame format information to transmitting the frame overhead district;
Step 5 is shone upon described fixed velocity service and can be used payload section to transmitting frame, and sends the transmission frame.
2. the method for claim 1 is characterized in that, described step 2 further comprises,
If can not carry, then abandon the fixed velocity service that surpasses, finish the transmission of described fixed velocity service.
3. the method for claim 1 is characterized in that, described fixed velocity service comprises SDH/SONET business and Ethernet service, and described Ethernet service is meant and does not carry out the preceding fixed velocity service of 8B/10B decoding.
4. the device that fixed velocity service transmits is characterized in that, comprise,
Professional byte computing module, carrying judging module, cache module, mapping control module, mapping cost insert module and transmission frame generation module;
Described professional byte computing module is used for calculating at the byte number that transmits the described fixed velocity service that the frame period receives;
Described carrying judging module, link to each other with described transmission frame generation module with described professional byte computing module, be used for byte number, judge whether the transmission frame in the described transmission frame generation module can carry described fixed velocity service with payload section according to described fixed velocity service;
Described cache module links to each other with described professional byte computing module, is used for the described carrying judge module of buffer memory and judges the fixed velocity service that can carry;
Described mapping control module, link to each other with described transmission frame generation module with described cache module, read by the described fixed velocity service that can carry is controlled, realize that the described fixed velocity service distributed mapping that can carry can use payload section to the transmission frame in the described transmission frame generation module;
Described mapping cost insert module links to each other with described transmission frame generation module with described professional byte computing module, is used for the byte number of described fixed velocity service is mapped to the transmission frame overhead district of described transmission frame generation module;
Described transmission frame generation module, link to each other with described cache module, described mapping control module and described mapping cost insert module, comprise described transmission frame payload section and described transmission frame overhead district, be used to deposit the described fixed velocity service that can carry, and generate complete transmission frame;
5. device as claimed in claim 4 is characterized in that, further comprises the business interface module, and described business interface module links to each other with described described professional byte computing module, is used to receive described fixed velocity service.
6. device as claimed in claim 5 is characterized in that, further comprises transmitting the frame sending module, and described transmission frame sending module links to each other with described transmission frame generation module, is used to send described complete transmission frame.
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| CN200610063011XA CN101155006B (en) | 2006-09-30 | 2006-09-30 | Method and apparatus for fixed velocity service transmission |
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| CN200610063011XA CN101155006B (en) | 2006-09-30 | 2006-09-30 | Method and apparatus for fixed velocity service transmission |
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| WO2024140375A1 (en) * | 2022-12-27 | 2024-07-04 | 华为技术有限公司 | Storage device, and data communication method and system |
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