CN101707553A - Method, device and system for transmitting synchronous service data - Google Patents
Method, device and system for transmitting synchronous service data Download PDFInfo
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- CN101707553A CN101707553A CN200910211702.3A CN200910211702A CN101707553A CN 101707553 A CN101707553 A CN 101707553A CN 200910211702 A CN200910211702 A CN 200910211702A CN 101707553 A CN101707553 A CN 101707553A
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Abstract
The invention provides a method, a device and a system for transmitting synchronous service data. The method comprises the following steps of: mapping received branch service data of one or more branches to virtual containers corresponding to the branches respectively; extracting the branch service payload of the branch service data and an adjustment opportunity bit corresponding to the branch service payload in each virtual container, and taking the adjustment opportunity bit as a differential time stamp of a branch signal clock of a branch corresponding to the virtual container and a system reference clock; and encapsulating the branch service payload of each branch and the adjustment opportunity bit corresponding to the branch service payload into a packet and transmitting the branch service payload and the adjustment opportunity bit through a packet based network. The invention also provides a device for transmitting the synchronous service data. The invention also provides a system for transmitting the synchronous service data. The method, the device and the system overcome the shortcoming that the packet based network in the prior art cannot realize clock synchronization when transmitting the synchronous service data.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of transmission method, device and system of synchronous service data.
Background technology
Along with people are the increase day by day of the multimedia communication demand of one to collection speech, image and data, to the also raising gradually of requirement of network transmission efficiency.Because Ethernet, asynchronous transfer mode (Asynchronous Transfer Mode, ATM) packet network such as network has characteristics such as bandwidth availability ratio height, (Time DivisionMultiplex TDM) professionally also will carry out the transmission of data by packet network to make the time division multiplexing of in communication evolution data such as traditional voice-bearer video.When utilizing packet network to carry out the transmission of TDM business datum, need to guarantee the clock synchronization of business data transmission, if the clock frequency of incoming traffic data is greater than the clock frequency of outgoing traffic data, then can produce the skip of data, lost frames information, if and the clock frequency of incoming traffic data then can produce reading again of data greater than the clock frequency of outgoing traffic data.
In the prior art, in order to realize the clock synchronization in the data transmission procedure, need be at all client edge (Customer Edge, CE) equipment or all Provider Edges (Provider Edge, PE) introduce clock on the equipment, with the business clock of this clock, so that the clock synchronization of all CE equipment or all PE equipment in the network guarantees the accurate transmission of TDM business datum in packet network as the TDM business.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: the networking cost of packet network when carrying TDM is professional is very high in the prior art, and can only support a clock zone, the clock synchronization in the time of can not realizing the synchronous service data transmission.
Summary of the invention
The embodiment of the invention provides a kind of transmission method, device and system of synchronous service data, the defective of clock synchronization when solving that packet network can not be realized the synchronous service data transmission in the prior art, realize that packet network can carry synchronous service, also can carry asynchronous service.
The embodiment of the invention provides a kind of transmission method of synchronous service data, comprising:
With the branch service data of one or more branch roads of receiving be mapped to respectively with branch road corresponding virtual container in;
From each virtual container, extract the branch service payload of the branch service data in this virtual container and the adjustment chance bit of described branch service payload correspondence, with described adjustment chance bit as the tributary signal clock of the branch road of this virtual container correspondence and the difference timestamp of system reference clock;
The adjustment chance bit-envelope of the branch service payload of each branch road and described branch service payload correspondence in the grouping message, and is transmitted by packet network.
The embodiment of the invention provides the transmission method of another kind of synchronous service data, comprising:
The grouping message that receives is carried out buffer memory and the processing of unpacking, extract the branch service payload in the described grouping message and adjust the chance bit;
With the difference timestamp of described adjustment chance bit as tributary signal clock and system reference clock, described branch service payload mappings is advanced the branch service Frame, and described branch service Frame mapping is multiplexed in the virtual container according to described adjustment chance bit;
Recover the branch service data according to the adjustment chance bit in the described virtual container.
The embodiment of the invention provides a kind of transmitting device of synchronous service data, comprising:
Mapping block, the branch service data that are used for the one or more branch roads that will receive are mapped to respectively and branch road corresponding virtual container;
Extraction module, be used for extracting the branch service payload of the branch service data correspondence this virtual container and the adjustment chance bit of described branch service payload correspondence from each virtual container that described mapping block generates, with described adjustment chance bit as the tributary signal clock of the branch road of this virtual container correspondence and the difference timestamp of system reference clock;
Group bag module, the adjustment chance bit-envelope that is used for the branch service payload of each branch road that described extraction module is obtained and described branch service payload correspondence be to the grouping message, and transmit by packet network.
The embodiment of the invention also provides the transmitting device of another kind of synchronous service data, comprising:
Parse module, the grouping message that is used for receiving carry out buffer memory and the processing of unpacking, and extract the branch service payload in the described grouping message and adjust the chance bit;
Become frame module, be used for described adjustment chance bit that described parse module is got access to difference timestamp as tributary signal clock and system reference clock, the described branch service payload mappings that described parse module gets access to is advanced the branch service Frame, and described branch service Frame mapping is multiplexed in the virtual container according to described adjustment chance bit;
Separate mapping block, the adjustment chance bit that is used for the described virtual container that generates according to described one-tenth frame module recovers the branch service data.
The embodiment of the invention provides a kind of transmission system of synchronous service data, comprises customer edge devices and provider edge equipment, and described provider edge equipment comprises the transmitting device of above-mentioned synchronous service data.
The transmission method of the synchronous service data of the embodiment of the invention, device and system, be mapped to respectively in the branch road corresponding virtual container by branch service data one or more branch roads, from each virtual container, extract the adjustment chance bit of branch service payload and this branch service payload correspondence, the difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, and with the branch service payload of a plurality of branch roads and corresponding adjustment chance bit-envelope in the grouping message, transmit by packet network, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
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 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 flow chart of the transmission method embodiment one of synchronous service data of the present invention;
Fig. 2 is the flow chart of the transmission method embodiment two of synchronous service data of the present invention;
Fig. 3 is the network architecture schematic diagram among the transmission method embodiment two of synchronous service data of the present invention;
Fig. 4 is the SDH mapping structure schematic diagram among the transmission method embodiment two of synchronous service data of the present invention;
Fig. 5 is the SONET mapping structure schematic diagram among the transmission method embodiment two of synchronous service data of the present invention;
Fig. 6 is the flow chart of the transmission method embodiment three of synchronous service data of the present invention;
Fig. 7 is the flow chart of the transmission method embodiment four of synchronous service data of the present invention;
Fig. 8 is the flow chart of the transmission method embodiment five of synchronous service data of the present invention;
Fig. 9 is the flow chart of the transmission method embodiment six of synchronous service data of the present invention;
Figure 10 is the structure chart of the transmitting device embodiment one of synchronous service data of the present invention;
Figure 11 is the structure chart of the transmitting device embodiment two of synchronous service data of the present invention;
Figure 12 is the structure chart of the transmitting device embodiment three of synchronous service data of the present invention;
Figure 13 is the structure chart of the transmitting device embodiment four of synchronous service data of the present invention;
Figure 14 is the structure chart of the transmission system embodiment of synchronous service data of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment 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.
Characteristics such as bandwidth availability ratio height based on packet network, utilize application that packet network comes the bearer service data more and more widely, can realize voice by packet network, the transfer of data that video etc. are professional, wherein, circuit emulation service (Circuit Emulation Service, CES) be one of technology of packet network carrying TDM business, and ATM CES is the emulation that the TDM business is provided by atm network, ETH (Ethernet) CES then represents by Metro Ethernet network (Metro Ethernet Network, MEN) provide the emulation of TDM business, expanded the scope of business and the user of packet network operator like this, the approach of legacy circuit network to the width data network migration also is provided.Carrying out business datum by packet network, when especially synchronous service data transmits, need to solve the clock synchronization issue of synchronous service data when transmission, to eliminate the slip produce owing to clock is asynchronous, the nonsynchronous problem of clock when in packet network, transmitting that present embodiment is intended to solve the synchronous service data that exists in the prior art.In the present embodiment, packet network is an example with the synchronous ethernet network, and the packet network loaded service is that example describes with the TDM business, follow-up repeating no more.
Fig. 1 is the flow chart of the transmission method embodiment one of synchronous service data of the present invention, and as shown in Figure 1, present embodiment provides a kind of transmission method of synchronous service data, can comprise the steps:
Specifically the adjustment chance bit of each branch service payload and this branch service payload correspondence can be encapsulated in the grouping message as the payload of message, specifically distinguish each grouping message and belong to which branch service payload, then the grouping after encapsulation message is transmitted by packet network by the index in the header.
Present embodiment provides a kind of transmission method of synchronous service data, by PE equipment the branch service data of one or more branch roads are shone upon, from each virtual container, extract the adjustment chance bit of branch service payload and this branch service payload correspondence, the difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, and the adjustment chance bit of each branch service payload and this branch service payload correspondence encapsulated in the grouping message as the payload of message, then the grouping after encapsulation message is transmitted by packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, make packet network can carry synchronous service, also can carry asynchronous service.
It is to be noted, can be transmitted as example to the TDM business datum with synchronous ethernet the scheme of the embodiment of the invention is carried out specific description, in the transmission course TDM business datum that receives is converted into the PACKET packet that transmits in the synchronous ethernet, needs simultaneously the PACKET packet is converted into the TDM business datum.The embodiment of the invention is the up direction of transfer of data with the TDM business datum to the direction that the PACKET packet transforms in synchronous ethernet, is the down direction of transfer of data with the PACKET packet to the direction that the TDM business datum transforms, follow-up repeating no more.In addition, when carrying out the transmission of business datum, the PE equipment of synchronous ethernet comprises tributary interface and line interface, wherein, tributary interface is that (line interface is and synchronous digital hierarchy (Synchronous Digital Hierarchy for Plesiochronous Digital Hierarchy, the PDH) interface of equipment connection with PDH (Pseudo-synchronous Digital Hierarchy), SDH) equipment or Synchronous Optical Network (Synchronous Optical Network, SONET) interface of equipment connection.Therefore, PE equipment can be the branch service data from the data that CE equipment receives, and also can be the line activities data, and a plurality of branch service data are through the multiplexing title line activities data of mapping, correspondingly, the line activities data are multiplexed into a plurality of branch service data through separating mapping.
Fig. 2 is the flow chart of the transmission method embodiment two of synchronous service data of the present invention, as shown in Figure 2, present embodiment provides a kind of transmission method of synchronous service data, present embodiment describes with the transmission to synchronous service data of the up direction of transfer of data, the data that PE equipment receives from CE equipment are the branch service data, and present embodiment can comprise the steps:
Packet network can be the synchronous ethernet network in the present embodiment, when carrying out the transmission of TDM business datum by the synchronous ethernet network, at the edge of synchronous ethernet network configuration PE equipment, receives the branch service data from a plurality of CE equipment.Fig. 3 is the network architecture schematic diagram among the transmission method embodiment two of synchronous service data of the present invention, as shown in Figure 3, both sides of the edge at the synchronous ethernet network are symmetrical arranged PE equipment respectively, PE equipment in the present embodiment can be the PEl equipment that is positioned at synchronous ethernet one side among Fig. 3, the 2nd PE equipment can be for being positioned at the PE2 equipment of synchronous ethernet network opposite side, a PE equipment receive CE1 equipment from client, CE2 equipment ... the branch service data of CEn equipment.Branch service data in the present embodiment can be the branch service data of a branch road, also can be the branch service data of a plurality of branch roads.PE equipment is after receiving the branch service data of one or more branch roads, the branch service data that receive are shone upon respectively and multiplexing process, the branch service data are shone upon respectively in each branch road corresponding virtual container, this virtual container can be virtual container (the Virtual Container of SDH, VC), also can be synchronous payload bag (the SynchronousPayload Envelope of SONET, SPE). because virtual container is to be generated by the system reference clock of PE equipment, it is synchronous for all devices, the size that is each virtual container is fixed, each corresponding virtual container of each branch service data, and the bit number that each virtual container can carry is greater than the bit number that is mapped to the branch service data in this virtual container. after the branch service data map is advanced virtual container, can remain out some bit numbers in the virtual container, remaining bit number is adjusts the chance bit. therefore, this step by with the branch service signal map of one or more branch roads in virtual container, adjustment chance bit with the branch service signal correspondence that generates each branch road, can embody the time clock correction of tributary signal clock and system reference by this adjustment chance bit. SDH mapping structure schematic diagram and SONET mapping structure schematic diagram among Fig. 4 and the transmission method embodiment two that is respectively synchronous service data of the present invention shown in Figure 5, with various speed (as 1544kbit/s, 2048kbit/s etc.) branch service data, respectively by the justification adaptation technique put into one with the corresponding standard virtual container of this branch service data rate rank in the multiplex mode of .SDH/SONET can realize asynchronous multiplexing, as the PDH signal multiplexing being advanced synchronous transfer mode (Synchronous Transport Module; Hereinafter to be referred as: STM), also can realize synchronous multiplexing, arrive the multiplexing of STM-4 as STM-1, by multiplexing step and the multiplexing structure that synchronous digital hierarchy comprised, can insert/tell low speed signal by high speed signal easily, also can not cause bigger signal time delay and the damage of sliding.
A plurality of branch service data are shone upon multiplexing after, the one PE equipment extracts the branch service payload of the branch service data in this virtual container and the adjustment chance bit of this branch service payload correspondence from each virtual container, specifically can resolve the branch service data after the mapping, from VC or SPE, parse the branch service payload of these branch service data, the expense of VC or SPE is peeled off, obtain the corresponding respectively adjustment chance bit of each branch service payload, with a plurality of adjustment chance bits of getting access to respectively as the tributary signal clock of the branch service payload correspondence of a plurality of branch roads and the difference timestamp of system reference clock.Because when advancing the branch service data map among VC or the SPE, the branch service data of different rates grade are mapped to be advanced among the different VC or SPE, and therefore, the adjustment chance bit of each branch service payload correspondence is also different.The difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, when the branch service data being transmitted by the synchronous ethernet network, with the system reference clock is benchmark, know branch service data shared frequency dividing ratio in virtual container by adjusting the chance bit, by first in first out (First In First Out, FIFO) smoothly just can obtain the tributary signal clock of up direction, with realize clock in the transmission course synchronously.
Wherein, adjust the head that the chance bit can be positioned at the message that stabs standing time, perhaps be arranged in the payload of the message of placing the branch service data.Wherein, the message that stab standing time can be specially real time transport protocol (Real-time Transfer Protocol, RTP), that promptly adjusts the chance bit can be positioned at the RTP header that stabs standing time, also can be placed on together in the payload (payload) of message with the branch service data.
The one PE equipment carries out buffer memory to each branch service payload and corresponding adjustment chance bit behind the adjustment chance bit of branch service payload that gets access to each branch road and branch service payload correspondence.Because the frame number of the branch service payload of being adorned in each grouping message is predefined, and comprise that is adjusted a chance bit in per four frame branch service payloads usually, the quantity of supposing the branch service payload that each grouping can encapsulate in message is 24 frames, then the branch service payload when buffer memory reaches 24 default frames, after the number of adjustment chance bit reaches default 6, just 24 frame branch service payloads of buffer memory and 6 corresponding adjustment chance bits are encapsulated, the luggage bag of going forward side by side is handled.Soon the adjustment chance bit of the branch service payload of each branch road and its correspondence is encapsulated in the grouping message as the payload of message, specifically distinguish each grouping message and belong to which branch service data by the index in the header, this grouping message can be CES Pseudo Wire Emulation Edge-to-Edge (Pseudo Wire Emulation Edge-to-Edge, PWE3) message is transferred to the 2nd PE equipment that is arranged in this synchronous ethernet network opposite side with the CES PWE3 message after the encapsulation by the synchronous ethernet network.
Present embodiment provides a kind of transmission method of synchronous service data, by the branch service data of one or more branch roads are shone upon respectively, from each virtual container, extract the adjustment chance bit of branch service payload and this branch service payload correspondence, the difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, and branch service payload and corresponding adjustment chance bit-envelope transmitted by packet network in the grouping message, realized the clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, make packet network can carry synchronous service, also can carry asynchronous service.
Fig. 6 is the flow chart of the transmission method embodiment three of synchronous service data of the present invention, as shown in Figure 6, present embodiment provides a kind of transmission method of synchronous service data, present embodiment describes with the transmission to synchronous service data of the up direction of transfer of data, the data that PE equipment receives from CE equipment are the line activities data, and present embodiment can comprise the steps:
In the present embodiment, the one PE equipment can be the PE1 equipment that is positioned at synchronous ethernet one side among Fig. 3, the 2nd PE equipment can be for being positioned at the PE2 equipment of synchronous ethernet network opposite side, the business datum that the one PE equipment receives is the line activities data, line activities data in the present embodiment are for meeting STM or Synchronous Transport Signal (Synchronous Transport Signal, STS) STM-N of standard or STS-N signal.Line activities data in the present embodiment can be the line activities data of a circuit, also can be the line activities data of a plurality of circuits.The one PE equipment carries out deciding the frame processing to the STM-N or the STS-N signal in the line side of input, removes section overhead wherein, administrative unit (Administrative Unit, AU) frame after obtaining handling.Decide the process of frame processing and promptly from the line activities data, obtain frame head, clock and the frame head that to decide the line activities data after frame is handled by the pointer adjustment are synchronized to respectively on system reference clock and the system side frame head, promptly be synchronized on system reference clock and the system side frame head by the clock and the frame head of pointer adjustment with the line side, make the AU frame after handling to adopt the system reference clock to regenerate, with the clock in elimination line side and the difference of system reference clock.
The one PE equipment is resolved the adjusted line activities data of pointer after the line activities data being carried out the pointer adjustment, obtains the branch service data in the adjusted AU frame of pointer.Be about to above-mentionedly peel off through expense in the pointer adjusted AU frame and pointer, obtain the branch service data of one or more branch road with parsing, carrying out follow-up mapping multiplexing process, the branch service data map of one or more branch roads is advanced among the SPE of the VC of the SDH that produces by the TDM system clock or SONET.
Present embodiment provides a kind of transmission method of synchronous service data, by the line activities data are carried out the pointer adjustment, with the clock synchronization of line activities data to the system reference clock, and the one or more branch service data in the adjusted AU frame of pointer are obtained in parsing, be mapped to one or more branch service data in the virtual container respectively, and from each virtual container, extract the branch service payload of the branch service data in this virtual container and the adjustment chance bit of this branch service payload correspondence, the difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, and with the adjustment chance bit-envelope of a plurality of branch service payloads and each branch service payload correspondence in the grouping message, transmit by packet network, realized the clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Fig. 7 is the flow chart of the transmission method embodiment four of synchronous service data of the present invention, and as shown in Figure 7, present embodiment provides a kind of transmission method of synchronous service data, and present embodiment can comprise the steps:
Step 703 recovers the branch service data according to the adjustment chance bit in the virtual container.
Present embodiment provides a kind of transmission method of synchronous service data, handle branch service payload and the adjustment chance bit that extracts in the grouping message by unpacking, with the difference timestamp of described adjustment chance bit as tributary signal clock and system reference clock, the branch service payload mappings is advanced the branch service Frame, and the mapping of branch service Frame is multiplexed in the virtual container according to adjusting the chance bit, recover the branch service data according to adjusting the chance bit again, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Fig. 8 is the flow chart of the transmission method embodiment five of synchronous service data of the present invention, as shown in Figure 8, present embodiment provides a kind of transmission method of synchronous service data, present embodiment describes with the transmission to synchronous service data of the down direction of transfer of data, the data that PE equipment receives from CE equipment are the branch service data, and present embodiment can comprise the steps:
Continuation is with reference to figure 3, PE equipment in the present embodiment can be the PE1 equipment that is positioned at synchronous ethernet network one side shown in Fig. 3, the 2nd PE equipment can be the PE2 equipment that is positioned at synchronous ethernet network opposite side shown in Fig. 3, when business datum is transmitted, be sent to the 2nd PE equipment from a PE equipment in the synchronous ethernet network.The 2nd PE equipment is behind the grouping message (for example the foregoing description two described CES PWE3 messages) that receives by the synchronous ethernet network from a PE equipment, the 2nd PE equipment carries out buffer memory to this grouping message, and flow carried out shaping, eliminate the shake that the synchronous ethernet network is brought. the second PE equipment can also be monitored the order of this message that divides into groups, adjust the order of out of order message, the message of packet loss is taked to mend bag measure etc., then to the processing of unpacking of this grouping message, extract the branch service payload in the grouping message and adjust the chance bit, for CES PWE3 message, the TDM branch service payload and the adjustment chance bit extraction that are about in this message are come out.
The 2nd PE equipment extracts TDM branch service payload and adjusts after the chance bit from the grouping message, the difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, be benchmark promptly with the system reference clock, know branch service data shared frequency dividing ratio in virtual container by adjusting the chance bit, smoothly just can obtain the tributary signal clock of down direction by FIFO, the feasible tributary signal clock that generates is identical with the tributary signal clock of up direction, make that the frequency of TDM service dispatching is consistent with the frequency that uplink service enters on the down direction, be implemented in the clock synchronization in the transmission course.After the 2nd PE equipment advances the branch service payload mappings in the branch service Frame, also the mapping of branch service Frame is multiplexed in the virtual container step 201 of concrete adaptation procedure in can similar the foregoing description according to adjusting the chance bit.Virtual container in the present embodiment can be the VC of SDH, also can be the SPE of SONET.
Further, adjust the head that the chance bit can be positioned at the message that stabs standing time, perhaps be arranged in the payload of the message of placing the branch service data.Wherein, the message that stab standing time can be the RTP message, promptly adjusts the chance bit and can be positioned at the RTP header that stabs standing time, also can be placed on together in the payload (payload) of message with the branch service data.
The 2nd PE equipment according to adjustment chance bit and the overhead-bits among VC or the SPE, recovers out with the branch service signal among VC or the SPE after getting access to the VC or SPE of mapping after multiplexing.
Present embodiment provides a kind of transmission method of synchronous service data, handle branch service payload and the adjustment chance bit that extracts in the grouping message by unpacking, adjust the difference timestamp of chance bit as tributary signal clock and system reference clock, the branch service payload mappings is advanced in the branch service Frame, and the mapping of branch service Frame is multiplexed in the virtual container according to adjusting the chance bit, recover the branch service data according to adjusting the chance bit again, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Fig. 9 is the flow chart of the transmission method embodiment six of synchronous service data of the present invention, as shown in Figure 9, present embodiment provides a kind of transmission method of synchronous service data, present embodiment describes with the transmission to synchronous service data of the down direction of transfer of data, the data that PE equipment receives from CE equipment are the line activities data, and present embodiment can comprise the steps:
The 2nd PE equipment is after the VC or SPE that get access to carrying branch service data, pointer according to the branch service data among system reference clock and system reference frame head generation VC or the SPE, and generation section overhead, the pointer of section overhead and generation is added among VC or the SPE, generate the line activities data with the branch service data and send, promptly form STM-N or the STS-N signal sends.
Present embodiment provides a kind of transmission method of synchronous service data, handle branch service payload and the adjustment chance bit that extracts in the grouping message by unpacking, according to adjusting the chance bit branch service payload mappings is multiplexed in the virtual container, recover the branch service data according to adjusting the chance bit again, and generate the pointer of the branch service data in the virtual container according to system reference clock and system reference frame head, pointer and section overhead are added in the virtual container, forming the line activities data with the branch service data sends, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Figure 10 is the structure chart of the transmitting device embodiment one of synchronous service data of the present invention, as shown in figure 10, present embodiment provides a kind of transmitting device of synchronous service data, and this device can be carried out each step among the said method embodiment two, repeats no more herein.Present embodiment describes with the transmission to synchronous service data of the up direction of transfer of data, and the data that PE equipment receives from CE equipment are the branch service data.The transmitting device of the synchronous service data that present embodiment provides can comprise mapping block 1001, extraction module 1002 and group bag module 1003.Wherein, the mapping block 1001 branch service data that are used for the one or more branch roads that will receive are mapped to respectively and branch road corresponding virtual container.Extraction module 1002 be used for from each virtual container that mapping block 1001 generates extract branch service data this virtual container the branch service payload, and the adjustment chance bit of this branch service payload correspondence, will adjust the chance bit as the tributary signal clock of the branch road of this virtual container correspondence and the difference timestamp of system reference clock.Group bag module 1003 is used for the adjustment chance bit-envelope of the branch service payload of each branch road that extraction module 1002 is obtained and branch service payload correspondence to the grouping message, transmits by packet network.
Further, adjust the chance bit can be positioned at stab standing time head, perhaps be arranged in the payload of the message of placing the branch service data.Wherein, the message that stab standing time can be the RTP message, and the placement location of promptly adjusting the chance bit can be positioned at the RTP header that stabs standing time, also can be placed on together in the payload (payload) of message with the branch service data.
Present embodiment provides a kind of transmitting device of synchronous service data, by mapping block is set, extraction module and group bag module, the branch service data of one or more branch roads are mapped to respectively in the branch road corresponding virtual container, from each virtual container, extract the adjustment chance bit of branch service payload and this branch service payload correspondence, to adjust the chance bit as the tributary signal clock of the branch road of this virtual container correspondence and the difference timestamp of system reference clock, and with a plurality of branch service payloads and corresponding adjustment chance bit-envelope in the grouping message, transmit by packet network, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Figure 11 is the structure chart of the transmitting device embodiment two of synchronous service data of the present invention, as shown in figure 11, present embodiment provides a kind of transmitting device of synchronous service data, and this device can be carried out each step among the said method embodiment three, repeats no more herein.Present embodiment describes with the transmission to synchronous service data of the up direction of transfer of data, and the data that PE equipment receives from CE equipment are the line activities data.Present embodiment can also comprise synchronization module 1101 and parsing module 1102 on the basis of above-mentioned embodiment shown in Figure 10.Wherein, the line activities data that synchronization module 1101 is used for the one or more circuits that will receive are carried out deciding frame and are handled, and clock and the frame head that will decide the line activities data after frame is handled by the pointer adjustment are synchronized to respectively on system reference clock and the system side frame head.Parsing module 1102 is used for the adjusted line activities data of pointer that synchronization module 1101 generates are resolved, and obtains the branch service data, and described branch service data are sent to mapping block 1001.
Present embodiment provides a kind of transmitting device of synchronous service data, by mapping block is set, extraction module, group bag module and synchronization module and parsing module, the line activities data are carried out the pointer adjustment, with the clock synchronization of line activities data to the system reference clock, and the branch service data in the adjusted AU frame of pointer are obtained in parsing, cross the branch service data are shone upon, and carry out adaptation processing by adjusting the chance bit, the difference timestamp of chance bit as tributary signal clock and system reference clock will be adjusted, and a plurality of branch service data and corresponding adjustment chance bit are carried out buffer memory, be encapsulated in the grouping message and transmit by packet network, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Figure 12 is the structure chart of the transmitting device embodiment three of synchronous service data of the present invention, as shown in figure 12, present embodiment provides a kind of transmitting device of synchronous service data, and this device can be carried out each step among the said method embodiment five, repeats no more herein.Present embodiment describes with the transmission to synchronous service data of the down direction of transfer of data, and the data that PE equipment receives from CE equipment are the branch service data.The transmitting device of the synchronous service data that present embodiment provides can comprise parse module 1201, become frame module 1202 to conciliate mapping block 1203.Wherein, the grouping message that parse module 1201 is used for receiving carries out buffer memory and the processing of unpacking, and extracts the branch service payload in the grouping message and adjusts the chance bit.Become frame module 1202, be used for adjustment chance bit that parse module 1201 is got access to difference timestamp as tributary signal clock and system reference clock, the branch service payload mappings that parse module 1201 gets access to is advanced the branch service Frame, and the mapping of branch service Frame is multiplexed in the virtual container according to adjusting the chance bit.Separating mapping block 1203 is used for recovering the branch service data according to the adjustment chance bit of the virtual container that becomes frame module 1202 to generate.
Further, adjust the head that the chance bit can be positioned at the message that stabs standing time, perhaps be arranged in the payload of the message of placing the branch service data.Wherein, the message that stab standing time can be the RTP message, and the placement location of promptly adjusting the chance bit can be positioned at the RTP header that stabs standing time, also can be placed on together in the payload (payload) of message with the branch service data.
Present embodiment provides a kind of transmitting device of synchronous service data, by parse module is set, become frame module to conciliate mapping block, handle branch service payload and the adjustment chance bit that extracts in the grouping message by unpacking, adjust the difference timestamp of chance bit as tributary signal clock and system reference clock, and the mapping of branch service Frame is multiplexed in the virtual container according to adjusting the chance bit, recover the branch service data according to adjusting the chance bit again, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Figure 13 is the structure chart of the transmitting device embodiment four of synchronous service data of the present invention, as shown in figure 13, present embodiment provides a kind of transmitting device of synchronous service data, and this device can be carried out each step among the said method embodiment six, repeats no more herein.Present embodiment describes with the transmission to synchronous service data of the down direction of transfer of data, and the data that PE equipment receives from CE equipment are the line activities data.Present embodiment is on the basis of above-mentioned embodiment shown in Figure 12, can also comprise adjusting module 1301, adjusting module 1301 is used for generating pointer to the branch service data of separating the virtual container that mapping block 1203 generates according to system reference clock and system reference frame head, described pointer and section overhead are added in the described virtual container, and generate the line activities data with the branch service data and send.
Present embodiment provides a kind of transmitting device of synchronous service data, by parse module is set, become frame module, separate mapping block and adjusting module, handle branch service payload and the adjustment chance bit that extracts in the grouping message by unpacking, the branch service payload mappings is advanced in the branch service Frame, according to adjusting the chance bit mapping of branch service Frame is multiplexed in the virtual container, recover the branch service data according to adjusting the chance bit again, pointer according to the branch service data in system reference clock and the system reference frame head generation virtual container, pointer and section overhead are added in the virtual container, forming the line activities data with the branch service data sends, present embodiment will be by adjusting the difference timestamp of chance bit as tributary signal clock and system reference clock, make clock synchronization when business datum is transmitted in packet network, solved the defective of clock synchronization when packet network can not be realized the synchronous service data transmission in the prior art, realized that packet network can carry synchronous service, also can carry asynchronous service.
Figure 14 is the structure chart of the transmission system embodiment of synchronous service data of the present invention, as shown in figure 14, present embodiment provides a kind of transmission system of synchronous service data, can comprise customer edge devices (CE equipment) 1401 and provider edge equipment (PE equipment) 1402, specific implementation is referring to above-mentioned network architecture diagram shown in Figure 3, wherein, PE equipment 1402 can comprise the transmitting device of above-mentioned Figure 10 or synchronous service data shown in Figure 11, and the transmitting device that comprises above-mentioned Figure 12 or synchronous service data shown in Figure 13.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (13)
1. the transmission method of a synchronous service data is characterized in that, comprising:
With the branch service data of one or more branch roads of receiving be mapped to respectively with branch road corresponding virtual container in;
From each virtual container, extract the branch service payload of the branch service data in this virtual container and the adjustment chance bit of described branch service payload correspondence, with described adjustment chance bit as the tributary signal clock of the branch road of this virtual container correspondence and the difference timestamp of system reference clock;
The adjustment chance bit-envelope of the branch service payload of each branch road and described branch service payload correspondence in the grouping message, and is transmitted by packet network.
2. the transmission method of synchronous service data according to claim 1 is characterized in that, also comprises:
The line activities data of one or more circuits of receiving are carried out deciding frame handle, clock and the frame head that will decide the line activities data after frame is handled by the pointer adjustment are synchronized to respectively on system reference clock and the system side frame head;
The adjusted line activities data of pointer are resolved, obtain the branch service data.
3. the transmission method of synchronous service data according to claim 1 is characterized in that, described adjustment chance bit is positioned at the head of the message that stabs standing time, perhaps is arranged in the payload of the message of placing described branch service data.
4. the transmission method of a synchronous service data is characterized in that, comprising:
The grouping message that receives is carried out buffer memory and the processing of unpacking, extract the branch service payload in the described grouping message and adjust the chance bit;
With the difference timestamp of described adjustment chance bit as tributary signal clock and system reference clock, described branch service payload mappings is advanced the branch service Frame, and described branch service Frame mapping is multiplexed in the virtual container according to described adjustment chance bit;
Recover the branch service data according to the adjustment chance bit in the described virtual container.
5. the transmission method of synchronous service data according to claim 4 is characterized in that, also comprises:
Generate the pointer of the branch service data in the described virtual container according to system reference clock and system reference frame head, described pointer and section overhead are added in the described virtual container, generate the line activities data and send.
6. the transmission method of synchronous service data according to claim 4 is characterized in that, described adjustment chance bit is positioned at the head of the message that stabs standing time, perhaps is arranged in the payload of the message of placing described branch service data.
7. the transmitting device of a synchronous service data is characterized in that, comprising:
Mapping block, the branch service data that are used for the one or more branch roads that will receive are mapped to respectively and branch road corresponding virtual container;
Extraction module, be used for extracting the branch service payload of the branch service data this virtual container and the adjustment chance bit of described branch service payload correspondence from each virtual container that described mapping block generates, with described adjustment chance bit as the tributary signal clock of the branch road of this virtual container correspondence and the difference timestamp of system reference clock;
Group bag module, the adjustment chance bit-envelope that is used for the branch service payload of each branch road that described extraction module is obtained and described branch service payload correspondence be to the grouping message, and transmit by packet network.
8. the transmitting device of synchronous service data according to claim 7 is characterized in that, also comprises:
Synchronization module, the line activities data that are used for the one or more circuits that will receive carry out deciding frame to be handled, and clock and the frame head that will decide the line activities data after frame is handled by the pointer adjustment are synchronized to respectively on system reference clock and the system side frame head;
Parsing module is used for the adjusted line activities data of pointer that described synchronization module generates are resolved, and obtains the branch service data, and described branch service data are sent to described mapping block.
9. the transmitting device of synchronous service data according to claim 7 is characterized in that, described adjustment chance bit is positioned at the head of the message that stabs standing time, perhaps is arranged in the payload of the message of placing described branch service data.
10. the transmitting device of a synchronous service data is characterized in that, comprising:
Parse module, the grouping message that is used for receiving carry out buffer memory and the processing of unpacking, and extract the branch service payload in the described grouping message and adjust the chance bit;
Become frame module, be used for described adjustment chance bit that described parse module is got access to difference timestamp as tributary signal clock and system reference clock, the described branch service payload mappings that described parse module gets access to is advanced the branch service Frame, and described branch service Frame mapping is multiplexed in the virtual container according to described adjustment chance bit;
Separate mapping block, the adjustment chance bit that is used for the described virtual container that generates according to described one-tenth frame module recovers the branch service data.
11. the transmitting device of synchronous service data according to claim 10 is characterized in that, also comprises:
Adjusting module, be used for generating the described pointer of separating the branch service data of the described virtual container that mapping block generates according to system reference clock and system reference frame head, described pointer and section overhead are added in the described virtual container, generate the line activities data and send.
12. the transmitting device of synchronous service data according to claim 10 is characterized in that, described adjustment chance bit is positioned at the head of the message that stabs standing time, perhaps is arranged in the payload of the message of placing described branch service data.
13. the transmission system of a synchronous service data, it is characterized in that, comprise customer edge devices and provider edge equipment, described provider edge equipment comprises the transmitting device of each described synchronous service data of claim 7-9 and the transmitting device of each described synchronous service data of claim 10-12.
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| CN200910211702.3A CN101707553B (en) | 2009-11-10 | 2009-11-10 | Method, device and system for transmitting synchronous service data |
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| CN101917340A (en) * | 2010-08-18 | 2010-12-15 | 中兴通讯股份有限公司 | Pseudo-wire emulation edge to edge (PWE3) downlink framing method and device for asynchronous transfer mode (ATM) service |
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| CN1204906A (en) * | 1997-05-09 | 1999-01-13 | 阿尔卡塔尔-阿尔斯托姆通用电气公司 | Apparatus for reducing jitter in asynchronous apparatus |
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