CN101064565B - Method for controlling information transmission/reception in automatic exchange optical network and its system - Google Patents
Method for controlling information transmission/reception in automatic exchange optical network and its system Download PDFInfo
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- CN101064565B CN101064565B CN2006100263021A CN200610026302A CN101064565B CN 101064565 B CN101064565 B CN 101064565B CN 2006100263021 A CN2006100263021 A CN 2006100263021A CN 200610026302 A CN200610026302 A CN 200610026302A CN 101064565 B CN101064565 B CN 101064565B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
Abstract
The invention provides a control information transmission/receiving method and system in ASON, said transmission method includes: a1) picking up control information and encapsulated; b1) mapping said encapsulated control information into the frame structure of the STM-N to insert byte; c1) transmitting the STM-N frame. In said method, the control information includes command, route or link managing information. Based on the invention, a standard container C4 channel of a STM-N possesses useful bandwidth of 1152Kbit/s; further, the control signal adopts ethernet network interface, it can realize the interlinkage between band and other control signal out of band effectively.
Description
Technical field
The present invention relates to optical transport technology, relate in particular to control information transmission/method of reseptance and system thereof among a kind of ASON (ASON).
Background technology
ASON is G.8080 defined by ITU-T (standardization department of international telecommunication union telecommunication), the maximum difference of it and traditional OTN (optical transport network) is that it is a kind of dynamic network, show the dynamic assignment of bandwidth and the automatic discovery aspect of network topology, the realization of this behavioral characteristics mainly comes from the effect of its control plane, and the key technology of structure control plane mainly contains route technology, signaling technology, link management technology etc.
The INFORMATION DISCOVERY of route technology performing routing operations and network topology and resource, relays link state information and calculation level are to the best route path of another node, ITU-T G.7715/Y.1706 draft has defined structure and requirement and the ASON routing infrastructure of setting up exchange connection SC and the soft permanent SPC of connection path routing function in ASON, functional units such as Path selection, routing property, abstracted information and state transition diagram, route messages is to transmit by DCN (data communication network), G.7712 standard a kind of possible implementation of DCN.
Signaling technology is used to finish automatic exchange linkage function, realizes end-to-end fast light path protection monitoring and recovery, sets up apace; remove and safeguard a light path across all-optical network; the signaling message of ASON can be to transmit in the band, and also can be that band is outer transmits.Usually, it adopts based on DCC (Data Communications Channel), i.e. the band inner control signaling tranmission techniques of the D1-D12 byte of SDH (synchronous digital transmission system) frame structure SOH (section overhead).
Link Resource Manager is used for control channel and administers and maintains, transmits the Connectivity Verification of link and Fault Isolation/location etc.Owing to have multiple different link circuit resource among the ASON, as various STM layer link among optical fiber link, wavelength link, the SDH and VC (virtual container) layer link or the like.These links are called SNP (subnet point) link in ASON, extensibility and route diversity for Routing Protocol, a plurality of different SNP links can be combined into SNPP (sub-network point pool) link, these SNPP link circuit resources are being managed by LRM (Link Resource Manager device) in ASON, promptly distribute according to the request that connects controller or discharge the SNP link to connect.But before management and controlling these SNPP link circuit resources, at first to find these link circuit resources and controlled entity thereof, Here it is automatic discovery technique.
G.7714, ITU-T advises the automatic discovery technique that transmits network has been carried out generality, functional frame description, mechanism such as layer adjacency discovery, physical medium adjacency discovery, the adjacency discovery of controlled entity logic and professional ability exchange have been discussed, but have not been related to the specific implementation mechanism and the detailed property parameters of discovery procedure.ITU-T G.7714.1 among the SDH of regulation and the OTN based on the discovery mechanism of the various different layers adjacency of trail trace byte, ECC (embedded communication passage), be to be sent to adjacent node find that message is carried in these trail trace bytes (use and use the TTI byte in Jx byte or the OTN network) or the ECC corresponding physical layer DCC path in SDH.
In the SDH network, operable mode has: at RS (regenerator section) layer, the DCC of J0 section trace byte and regenerator section (D1-D3) can support the syntople between the TCP (terminal tie-point) of RS section layer; At MS (multiplex section) layer, the DCC of multiplex section (D4-D12) can be used for finding the syntople between the TCP of MS section layer; At high-order VC layer, higher order path layer J1 trace byte can be used to find the syntople between the TCP of high-order VC layer; At low order VC layer, low order channel layer J2 trace byte can be used to find the relation of the adjacency between the TCP of low order VC layer.
In the OTN network, operable discover method has: at optical channel transmission unit-k (OTUK) layer, section monitors that byte and all purpose communication passage-O (GCC0) can be used to find the syntople between the OTUk layer TCP, especially, monitor that in section source end Access Point Identifier (SAPI) subdomain in the byte can carry discovery message; At optical channel data cell-k (ODUk) layer, section monitors that byte and all purpose communication passage-1 (GCC1) can be used to find the syntople between the ODUk layer TCP, especially, monitor that in section source end Access Point Identifier (SAPI) subdomain in the byte can carry discovery message.
But, there is compatibility issue based on automatic discovery technique and original transmission net of Jx byte, in original transmission net, the Jx byte might be used as channel monitoring or the monitoring of equipment connectivity; On the other hand, the bandwidth of Jx byte has only 64Kbit/s, and at large-scale ASON network, the message communicating amount of finding is big automatically, and it can't satisfy the communication of high bandwidth, and convergence rate is slow.
And based on the automatic discovery technique of ECC, as previously mentioned, the D1-D3 byte constitutes the regeneration section dcc among the DCC, the D4-D12 byte constitutes multiplexing section dcc, it may be used for the control signaling exchange between the terminal, its altogether the data communication channel of 768kbit/s for control signaling, Link Resource Manager, still can't satisfy high-bandwidth communication in the large-scale ASON network, fast the needs of convergence.
The present invention will solve bandwidth problem that control information among the ASON transmits and because different control information load modes and issuable and original transmission net compatibility issue.
Summary of the invention
According to an aspect of the present invention, control information transfer approach among a kind of ASON comprises: a1), extract control information and encapsulate; B1), the control information after the described encapsulation is shone upon into R in STM-N (Synchronous Transport Module level-N) frame structure (the fixing byte of inserting) byte; C1), carrying out the STM-N frame sends.
In the above-mentioned transfer approach, control information comprises signaling, route or link management information.
In the above-mentioned transfer approach, step a1) described encapsulation uses PPP (point to point communication protocol), LAPS (Link Access Procedure) or GFP (Generic Framing Procedure) protocol mode to handle.
According to another aspect of the present invention, control information method of reseptance among a kind of ASON comprises: a2), receive the STM-N frame; B2), extract the control information of being shone upon in its R byte in the STM-N frame; C2), to the control information decapsulation of being shone upon and reduce.
In the above-mentioned method of reseptance, control information comprises signaling, route or link management information.
In the above-mentioned method of reseptance, step a2) described encapsulation uses PPP, LAPS or GFP protocol mode to handle.
According to another aspect of the present invention, a kind of automatic optical network system comprises transmitting terminal, receiving terminal, wherein: described transmitting terminal extract control information and carry out corresponding encapsulation, R byte in the STM-N frame structure is advanced in mapping, carry out the STM-N frame and send; Described receiving terminal receives the STM-N frame, extracts the control information of being shone upon in the R byte, and described control information is reduced in decapsulation;
In the above-mentioned automatic optical network system, the control information after receiving terminal further will reduce is packaged into ethernet signal, to realize and the outer DCN control information intercommunication of band.
In the above-mentioned automatic optical network system, control information comprises signaling, route or link management information.
According to inventive concept, the R byte transmits control informations such as ASON signaling, route or Link Resource Manager in the use STM-N frame structure, because the R byte is not used in the STM-N frame structure, do not exist and the legacy network compatibility issue, in the volumetric standard C4 of STM-N, can utilize 2 * 9=18 byte, amount to the 1152Kbit/s bandwidth, thereby expanded control information load mode and available bandwidth effectively; Further, optical network unit adopts Ethernet interface to handle Ethernet is carried out in control information to be handled, and can realize in the band effectively and other band outer control passages (for example DCN network) interconnect.
Description of drawings
Fig. 1 is an ASON system construction drawing of the present invention;
Fig. 2 is a control information transmission/method of reseptance among the ASON of the present invention;
Fig. 3 is an ASON control information transmission/method of reseptance schematic diagram of the present invention;
Fig. 4 is that the R byte is inserted schematic diagram in the SDH frame multiplex process;
Fig. 5 is that STM-N frame structure and R byte thereof are used.
Embodiment
Below in conjunction with accompanying drawing, preferred implementation of the present invention is described in detail.
Fig. 1 is in the ASON of the present invention system, the communication channel exchange of control information that the R byte of STM-N frame is formed in the transmission link 12 that is constituted by its optical interface STM-N between optical-fiber network network element 11 and the optical-fiber network network element 13.Here control information can be control signaling 121, link management information 122 or a routing iinformation 123, for example to the automatic discovery message in the link management information 122: message such as Hello, Config, ConfigACK.
Below, in conjunction with Fig. 2 control information transmission/method of reseptance in the ASON system is further described:
Transmitting terminal--optical-fiber network network element 11 extracts control information and carries out corresponding encapsulation, mapping and advance R byte in the standard STM-N frame structure of SDH, carries out the SDH Frame and sends;
Step S21, the extraction control information also encapsulates.This control information can be signaling control information, routing iinformation and/or resource management information.The mode of its encapsulation can adopt a little to PPP, LAPS or GFP protocol encapsulation mode, when adopting the Link Access Procedure-SDH protocol packaged type: the upper strata control information comes then, add special frame bebinning character, and whether have in the judgment data with the same character of spcial character that plays the sign effect, if have, carry out the spcial character conversion, add byte of padding after, carry out transmitting after FCS (frame check) handles; When adopting GFP protocol encapsulation mode: this agreement is generally used for encapsulation of data information, and gfp frame is made of core frame head and payload section, the control information encapsulation is entered its payload section and load that Frame Check Sequence FCS handles, GFP core frame head is handled.
Step S22 shines upon described control information R byte in the digital delivery module STM-N frame structure of SDH into.Usually, in the SDH transmission system, adopted the time-division byte intertexture division multiplexing, for the STM-N frame structure of formation rule, need to add and repeatedly insert the R byte in multiplex process, the R byte belongs to useless byte, in the transport process of STM-N frame structure, without any use, here, we use the control information after R byte in the SDH frame is carried above-mentioned encapsulation process.Fig. 3 is that the R byte is inserted schematic diagram in the multiplexing STM-N of the advancing signal of 34Mbit/s, at first, the signal of 34Mbit/s is fitted to it in corresponding standard container C 3 through justification earlier, add that then corresponding POH (path overhead) is packaged into VC3, the frame structure of this moment is 9 * 85, and (OK * row) locatees VC3 for the ease of receiving terminal, so that it directly can be separated out from high speed signal, the PTR (pointer) that on the frame of VC3, has added 3 bytes, the message structure of this moment is tributary unit TU3 (with the corresponding message structure of the signal of 34Mbit/s), the frame structure of TU3 is a bit incomplete, need earlier its barbed portion to be filled, usually adopt R byte inserted mode, message structure after the R byte of 6 bytes of insertion is tributary unit group TUG3, three TUG3 are combined into the C4 signal structure by R byte inserted mode, because TUG3 is so that the message structure after compound is the block frame structures of 9 * 258 row and C4 is 9 * 260 block frame structure by the byte intertexture division multiplexing mode for 3 TUG3 of message structure of 9 * 86, make it become the message structure of C4 so add two row (2 * 9) R bytes in the composite structure front of 3 TUG3, remaining work is exactly C4 to be multiplexed among the STM-N gone, i.e. C4 → VC4 → AU-4 → AUG → STM-N.So, in the multiplexing process of 34M digital signal, 2 * 9 R bytes are arranged in the C4 of STM-N, 6 R bytes are arranged among the TUG3; Control information after 2 * 9 R bytes carrying encapsulation process of utilizing C4 then utilizes the control channel bandwidth of this mode will be 1152Kbit/s.
Step S23, the STM-N optical interface carries out electrical-optical conversion and transmission to the STM-N Frame of multiplexing formation.Fig. 4 is that STM-1 frame structure and R byte thereof are used, and its frame structure is made up of three parts: SOH, AU_PTR (Administrative Unit Pointer), PayLoad (information payload).SOH comprises RSOH (RSOH) and MSOH (MSOH), and RSOH is made up of the 1st to the 3rd row of SOH in the STM-N signal, and MSOH is made up of to eighth row the 5th of SOH in the STM-N signal; AU-PTR is arranged in STM-N frame the 4th row, totally 9 bytes; In the information payload, POH is loaded in the STM-1 frame with the information code block as the part of net load, and it is responsible for that low speed signal is carried out channel performance and monitors, manages and control, as previously mentioned, and the control information after the R byte carrying encapsulation process in the net load.
Receiving terminal--optical-fiber network network element 13 receives the STM-N Frame of SDH, extracts the control information of being shone upon in the R byte in the data frame structure, and the also control information of original sender of decapsulation;
Step S23 ', STM-N optical interface receiving optical signals also carries out light-electricity conversion, output STM-N Frame;
Step S22 ', the control information of being shone upon in the R byte in extraction and the reduction SDH data frame structure;
Step S21 ' carries out decapsulation and reduces described control information.In LAPD protocol encapsulation mode, its decapsulation mode is: judge spcial character, determine the starting point of frame, and reception information, and carry out the spcial character inverse transformation, and remove byte of padding, the reduction control information is sent into the upper-layer protocol layer and is handled.If the GFP encapsulation, its decapsulation mode is: the method for utilizing GFP circulation CRC to delimit is determined frame head, and utilizes Length Indication field indication frame length, and the extraction control information is sent into the upper-layer protocol layer and handled.
What deserves to be explained is, according to inventive concept, if the R byte is carried different control informations in transmitting terminal-optical-fiber network network element 11 use data frame structures, for example while bearer control signalling and discovery message automatically, above-mentioned steps S21 ' need further to distinguish and be sent to corresponding upper-layer protocol layer to the control information of being carried to be handled.Because control information is carried by IP, usually we can come the control information type of being carried is distinguished by the protocol fields or the TCP/UDP port numbers of IP layer, be which is the control signaling, which is to find message automatically, and is sent to corresponding upper-layer protocol layer and handles.
In order to realize interconnecting with the outer control information of other bands, control information to the far-end after the decapsulation, its upper-layer protocol layer can further be packaged into ethernet signal with it, to realize and the outer DCN signalling path intercommunication of ether guipure, satisfies different control channels and transmits compatible.
Fig. 5 further implements structural representation by optical network unit explanation is simply done in the transmission/reception of its control information, it comprises ASON control unit 51, Link Resource Manager unit 52, routing unit 53, Ethernet interface unit 54, encapsulation process unit 55, frame multiplex/demultiplex unit 56, wherein:
ASON control unit 51, Link Resource Manager unit 22, routing unit 53 will be respectively applied for its corresponding control signal (for example control signaling, find message etc., route messages automatically) of this optical network unit generation, select different control channel load mode (comprising selection) to load mode in the selection of load mode in band or out of band or the different band; And receive control signal from other optical network unit, and respective handling by different control channel load modes.
Encapsulation process unit 24, for transmitting terminal, it will carry out encapsulation process from the control information on upper strata, and described control information can be from ASON control unit 51, Link Resource Manager unit 22 or routing unit 53 and their any combinations; Encapsulation process can utilize Link Access Procedure-SDH protocol encapsulation or GFP agreement etc. to carry out encapsulation process; For receiving terminal, its reception is carried out reverse decapsulation from the control information of other optical network unit and is handled and be sent to corresponding ASON control unit 51, Link Resource Manager unit 22 or routing unit 53 and handle.
What deserves to be explained is, if receiving control channel carries different control informations, for example while bearer control signalling and discovery message automatically, encapsulation process unit 24 needs further to distinguish control information and is sent to corresponding ASON control unit 51 after decapsulation disposes, Link Resource Manager unit 22 or routing unit 53 are handled, above-mentioned control information is carried by IP, usually can come the control information type of being carried is distinguished by the protocol fields or the TCP/UDP port numbers of IP layer, promptly which be the control signaling, which is to find message automatically, which is a routing iinformation.
SDH frame multiplex/demultiplex unit 56, at transmitting terminal, the R byte in the STM-N frame structure is into shone upon in its control information after with above-mentioned encapsulation process; At receiving terminal, the control information of being carried in the R byte in its extraction STM-N frame structure.
In order to realize interconnecting with the outer control information of other bands, optical network unit further comprises Ethernet interface unit 54, to be packaged into ethernet signal from the control information of ASON control unit 51, Link Resource Manager unit 52 and/or routing unit 53, with the DCN signalling path intercommunication that realizes that the ether guipure is outer.
Although above-mentioned being illustrated as the invention provides some embodiment; be not to be used for limiting protection scope of the present invention; the professional in present technique field can carry out various modifications to embodiment under the prerequisite that does not depart from the scope of the present invention with spirit, this modification all belongs in the scope of the present invention.
Claims (9)
1. control information transfer approach in the ASON system comprises:
A1), extract control information and encapsulating;
B1), the control information after the described encapsulation is shone upon fixedly insertion byte in the Synchronous Transport Module level-N STM-N frame structure into;
C1), the STM-N frame is carried out electrical-optical conversion and transmission.
2. the method for claim 1 is characterized in that described control information comprises signaling, route or link management information.
3. method as claimed in claim 1 or 2 is characterized in that described step a1) in described encapsulation use PPP (point to point communication protocol), LAPS (Link Access Procedure agreement) or GFP (Generic Framing Procedure) protocol mode to handle.
4. control information method of reseptance in the ASON system comprises:
A2), receive STM-N frame and described STM-N frame carried out the conversion of light-electricity;
B2), extract the control information of being shone upon in its fixing insertion byte in the STM-N frame;
C2), to the control information decapsulation of being shone upon and reduce.
5. method as claimed in claim 4 is characterized in that described control information comprises signaling, route or link management information.
6. as claim 4 or 5 described methods, it is characterized in that described step a2) in described decapsulation use PPP, LAPS or GFP protocol mode to carry out reverse process.
7. an ASON system comprises transmitting terminal, receiving terminal, it is characterized in that:
Described transmitting terminal extracts control information and carries out corresponding encapsulation, mapping and advance fixingly in the STM-N frame structure to insert byte, the STM-N frame is carried out the electrical-optical conversion and send;
Described receiving terminal receives the STM-N frame and described STM-N frame is carried out light-electricity conversion, extracts the control information of being shone upon in the fixing insertion byte and decapsulation and reduce described control information.
8. ASON system as claimed in claim 7 is characterized in that the control information after described receiving terminal further will reduce is packaged into ethernet signal, to realize and outer DCN (data communication network) the control information intercommunication of band.
9. as claim 7 or 8 described ASON systems, it is characterized in that described transmitting terminal, receiving terminal control information comprise signaling, route or link management information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100263021A CN101064565B (en) | 2006-04-30 | 2006-04-30 | Method for controlling information transmission/reception in automatic exchange optical network and its system |
| PCT/CN2007/001142 WO2007128193A1 (en) | 2006-04-30 | 2007-04-09 | A method for transmitting/receiving the control information in ason and the system thereof |
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| CN2006100263021A CN101064565B (en) | 2006-04-30 | 2006-04-30 | Method for controlling information transmission/reception in automatic exchange optical network and its system |
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| CN101064565A CN101064565A (en) | 2007-10-31 |
| CN101064565B true CN101064565B (en) | 2010-12-08 |
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| JP5136132B2 (en) * | 2008-03-17 | 2013-02-06 | 日本電気株式会社 | Optical transmission apparatus, optical transmission system, apparatus control method, and apparatus program |
| CN102404153A (en) * | 2011-11-30 | 2012-04-04 | 武汉烽火网络有限责任公司 | Method and device for realizing SDH management network based on DCN and software exchange |
| CN108243035B (en) | 2016-12-26 | 2021-04-09 | 华为技术有限公司 | DCN message processing method, network equipment and network system |
| CN107396214B (en) * | 2017-07-31 | 2023-08-18 | 广东中云海科技有限公司 | 128 x 128 path broadband data signal real-time exchange system and exchange method |
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| US6603776B1 (en) * | 1999-04-05 | 2003-08-05 | Lucent Technologies, Inc. & Pmc-Sierra, Inc. | System for efficient broadband data payload conversion |
| ITMI20020163A1 (en) * | 2002-01-31 | 2003-07-31 | Marconi Comm Spa | INFORMATION STRUCTURE FOR THE TRANSPORT OF DATA IN PARTICULAR OF SDH SONER AND OTN TYPE AND WORKING INFORMATION WITHIN A NETWORK ELEMENT |
| CN100508475C (en) * | 2003-09-29 | 2009-07-01 | 上海贝尔阿尔卡特股份有限公司 | Multi-service transmitting method, node device and multi-service transmitting platform |
| CN100550716C (en) * | 2004-10-09 | 2009-10-14 | 华为技术有限公司 | Realize professional method and system of intersecting |
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