CN102843293B - A kind of method and network element device for handling message - Google Patents

A kind of method and network element device for handling message Download PDF

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Publication number
CN102843293B
CN102843293B CN201210296552.2A CN201210296552A CN102843293B CN 102843293 B CN102843293 B CN 102843293B CN 201210296552 A CN201210296552 A CN 201210296552A CN 102843293 B CN102843293 B CN 102843293B
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ptp messages
ptp
network element
otu
messages
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CN102843293A (en
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杨明杰
张建军
吴胜兵
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ZTE Corp
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ZTE Corp
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Priority to CN201210296552.2A priority Critical patent/CN102843293B/en
Publication of CN102843293A publication Critical patent/CN102843293A/en
Priority to PCT/CN2013/081765 priority patent/WO2013189361A2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0647—Synchronisation among TDM nodes
    • H04J3/065—Synchronisation among TDM nodes using timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/28—Timers or timing mechanisms used in protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
    • H04L67/5683—Storage of data provided by user terminals, i.e. reverse caching

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention provides a kind of method and network element device for handling message, and this method includes：Assemble Precision Time Protocol (PTP) message；Sent by the reserve bytes of PTP messages insertion optical transmission unit (OTU) frame overhead or after being mixed into ether network packet.PTP protocol message interaction can be realized between wavelength-division network network element by the present invention so that PTP protocol message can be transmitted and parse between each network element, so as to realize that the precise time of wavelength-division network transmits.

Description

A kind of method and network element device for handling message
Technical field
The present invention relates to light wave to divide the communications field, realizes the place of the full Element Time Synchronization of wavelength-division system and precise time transmission Manage the method and network element device of message.
Background technology
Traditional TDM (Time Division Multiplex, time division multiplexing) network (PDH (Plesiochronous Digital Hierarchy, PDH)/SDH (Synchronous Digital Hierarchy, synchronous digital Series) while TDM business (such as E1/T1) is transmitted, can accurately transmit clock information, receiving terminal can according to extraction when Clock information is recovered to business.It is more general meanwhile TDM circuits can also provide synchronous refernce clocks for some application networks Time application be mobile Backhaul (Mobile backhaul) network.With WDM (Wavelength Division Multiplexing, Wave division multiplexing) system develops to directions such as multiple-bearer, multi-service and intellectualities, to wavelength-division system Network quality, business service type propose higher requirement, it is also desirable to realize the whole network time synchronized and provide it is accurate when Between function.
The PTP (Precision Time Protocol, Precision Time Protocol) defined according to IEEE1588v2, passes through handle Protocol signaling during for realizing network precise time pair is filled in TCP (Transmission in the form of payload (load) Control Protocol transmission control protocols)/UDP (User Datagram Protocol, UDP) layer report In text, then encapsulate by IP layers and Ethernet, or directly encapsulate protocol signaling with ether web form, each node of network it Between carry out it is point-to-point interaction transmit and parse and handles, realize the whole network time synchronized and offer precise time function.At present Number is logical, PTN (Packet Transport Network, Packet Transport Network) network generally uses this mode.
And the characteristics of wavelength-division network is to realize Large Copacity, long-distance transmissions, customer service OTU has been subjected to (Optical Transform Unit, optical transmission unit) frame encapsulates；Its apparatus is as shown in figure 1, typical networking mode As shown in Fig. 2 wavelength-division system is as shown in Figure 3 to an one-way traffic flow processing mode and step for the Ethernet service of user：
Fig. 3 show the typical wavelength-division network being made up of three wavelength-division network elements, and customer service accesses from customer side, after intersection Convergence is packaged into OTUk frames, is sent to next network element and is handled, until the OTU frames for encapsulating customer service are sent into purpose Network element, then decapsulate, customer service is reverted to, is sent from client's side plate.Concretely comprise the following steps：
Step 301：Wavelength-division network device client side business reception device 201 receives the GE of user (GigabitEthernet, gigabit Ethernet)/FE (FastEthernet, Fast Ethernet) business, Ethernet service is sealed Fill as ODUk frames, sent by backboard connecting line toward business electricity cross processing device 203；
Step 302：Business is carried out cross processing by electric cross processing device 203, by the ODUk frames after progress cross processing Sent by backboard connecting line toward line side business packed dispensing device 205；
Step 303：ODUk frames are packaged into OTU frames by line side business packed dispensing device 205, are sent toward network element 2；
Step 304：The line side service receiving device 209 of network element 2 receives OTU frames and is descapsulated into ODUk frames, is sent to electric friendship Pitch processing unit 208；
Step 305：Business is carried out cross processing by electric cross processing device 208, by the ODUk frames after progress cross processing Sent by backboard connecting line toward line side business packed dispensing device 210；
Step 306：ODUk frames are packaged into OTU frames by line side business packed dispensing device 210, are sent toward network element 3；
Step 307：The line side service receiving device 214 of network element 3 receives OTU frames and is descapsulated into ODUk frames, is sent to electric friendship Pitch processing unit 213；
Step 308：Business is carried out cross processing by electric cross processing device 213；By the ODUk frames after progress cross processing Sent by backboard connecting line toward client's side business and decapsulate dispensing device 212；
Step 309：ODUk frames are descapsulated into Ethernet service by client's side business decapsulation dispensing device 212, are sent to Customer equipment；
During this, business is all always to be transmitted in a network in the form of ODUk, OTU frame, is that a kind of end completely is arrived The transmission mode at end.And PTP protocol message need to be encapsulated in ethernet frame format and interact, using existing this technology, PTP protocol message can not be stripped out in line side, and wavelength-division network can not be realized between each network element to ether network packet Transmit and parse, so as to transmit and parse protocol signaling during network precise time pair between each network element, do not realize The whole network time synchronized and the function that precise time is provided.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of method and network element device for handling message, with wavelength-division network PTP protocol message interaction is realized between network element so that PTP protocol message can be transmitted and parse between each network element, so as to realize The precise time transmission of wavelength-division network.
In order to solve the above-mentioned technical problem, the invention provides a kind of method for handling message, including：
Assemble Precision Time Protocol (PTP) message；
By the reserve bytes of PTP messages insertion optical transmission unit (OTU) frame overhead or it is mixed into ether network packet After send.
Further, the above method also has following feature：The reservation that the PTP messages are inserted to OTU frame overheads Byte includes：
The PTP messages are disassembled into several 1 byte fields or multibyte fields, OTU frames are inserted in the form of multi-frame and are opened The reserve bytes of pin.
Further, the above method also has following feature：It is described that the PTP messages are inserted into optical transmission unit (OTU) The reserve bytes of frame overhead are mixed into ether network packet and included：
The PTP messages are periodically inserted into the reserve bytes of OTU frame overheads or are mixed into ether network packet.
Further, the above method also has following feature：Also include：
After receiving Ethernet service, detect whether the Ethernet service includes PTP messages, such as include PTP messages, then The PTP messages are isolated from the Ethernet service.
Further, the above method also has following feature：Also include：
After receiving OTU frames, detect whether the OTU frames carry PTP messages, such as carry PTP messages, then from the OTU The PTP messages are parsed in frame.
In order to solve the above problems, present invention also offers a kind of network element device, including：
First module, for assembling Precision Time Protocol (PTP) message, by the PTP messages be sent to the second module and/ Or the 3rd module；
Second module, for will be sent out after the reserve bytes of PTP messages insertion optical transmission unit (OTU) frame overhead Send；
3rd module, for being sent after the PTP messages are mixed with ether network packet.
Further, said network element equipment also has following feature：
Second module, specifically for the PTP messages are disassembled into several 1 byte fields or multibyte fields, Sent after the reserve bytes of OTU frame overheads are inserted in the form of multi-frame.
Further, said network element equipment also has following feature：
First module, specifically for the PTP messages periodically are sent into the second module and/or the 3rd module.
Further, said network element equipment also has following feature：Also include：
4th module, after receiving Ethernet service, detect whether the Ethernet service includes PTP messages, such as Including PTP messages, then the PTP messages are isolated from the Ethernet service.
Further, said network element equipment also has following feature：Also include：
5th module, after receiving OTU frames, detect whether the OTU frames carry PTP messages, such as carry PTP reports Text, then the PTP messages are parsed from the OTU frames.
To sum up, the present invention provides a kind of method and network element device for handling message, can be real between wavelength-division network network element Existing PTP protocol message interaction so that PTP protocol message can be transmitted and parse between each network element, so as to realize wavelength-division network Precise time transmits.
Brief description of the drawings
Fig. 1 is existing wavelength-division net element business processing unit；
Fig. 2 typical case's wavelength-division network element group network schematic diagram；
Fig. 3 is the unidirectional Ethernet service process chart of existing wavelength-division network element；
Fig. 4 is the schematic diagram of the wavelength-division network element device of the embodiment of the present invention；
Fig. 5 is the method for the PTP protocol message that the network element client-side device processing customer equipment of the embodiment of the present invention is sent Flow chart；
Fig. 6 is the stream that the network element client-side device of the embodiment of the present invention sends the method for PTP protocol message to customer equipment Cheng Tu；
Fig. 7 is the method that the network element circuit side apparatus of the embodiment of the present invention sends PTP protocol message to network element line side Flow chart：
Fig. 8 is that the network element circuit side apparatus of the embodiment of the present invention sends the side of PTP protocol message to network element line receiver side The flow chart of method；
Fig. 9 is that the network element client-side device of the embodiment of the present invention interacts the networking signal of PTP protocol message with customer equipment Figure；
Figure 10 is the networking signal that the network element line side of the embodiment of the present invention and network element line side interact PTP protocol message Figure；
Figure 11 is the OTU frame overhead reserved word locations drawing of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application Feature can mutually be combined.
To realize that PTP protocol message interacts between each network element of wavelength-division network, and service channel is not take up, can incited somebody to action PTP messages disassemble into some 1 byte fields or multibyte fields, are filled into frame in the reserve bytes of OTUk frames, pass to opposite end, Opposite equip. parses the field, and PTP protocol message is reformulated after extraction, PTP protocol processing unit is given and is handled.
The schematic diagram of the wavelength-division network element of the embodiment of the present invention, as shown in figure 4, data interaction between each device in wavelength-division network element Completed by backboard connecting line；
Comprising with original technology identical with lower module：
Client's side business receiving and processing device 403, for receiving customer side Ethernet service and being packaged into ODUk frames；
Client's side business decapsulates dispensing device 404, for ODUk frames to be descapsulated into Ethernet service；
Electric cross processing device 406, for carrying out cross processing to ODUk frames；
Circuit side business receiving and processing device 407, for OTU frames to be descapsulated into ODUk frames；
Line side business packed device 408, for ODUk frames to be encapsulated as into OTU frames；
Also including newly increasing with lower module：
Customer side PTP messages separator 401, for the ether network packet comprising PTP information to be divided from client traffic Separate out and；
Customer side PTP messages are incorporated into device 402, are transmitted for PTP signalings to be incorporated into client traffic；
PTP messages centralized processor 405, for PTP signalings to be focused on into calculating, the signaling for carrying out PTP protocol is handed over Mutually；
Line side PTP signalings separator 409, for the OTU frames of receiving circuit side, PTP signalings are separated from OTU frames Recover；
Line side PTP signalings insertion dispensing device 410, for the message containing PTP signalings to be inserted into OTU in the form of multi-frame The reserve bytes of frame overhead, the reserve bytes of the OTU frame overheads can be located at the 1st row 13-14 bytes of OTU frames, the 2nd row 1-2 Byte, the 4th row 9-14 bytes, PTP expenses position can configure, as shown in figure 11；
Method used in the embodiment of the present invention, the forwarding of PTP messages branch is employed, is focused on, will be with ethernet frame The PTP signalings of carrying are transmitted by way of inserting OTU frame overhead reserve bytes in line side, are realized between each network element PTP protocol message interaction.
Fig. 5 and Fig. 6 is the stream that the network element customer side of the embodiment of the present invention interacts the method for PTP protocol message with customer equipment Cheng Tu；
Fig. 9 is that the network element customer side of the embodiment of the present invention interacts PTP protocol message with customer equipment (by taking PTN device as an example) Networking schematic diagram.
So that wavelength-division network element customer side docks with PTN device as an example, as shown in figure 5, comprising the following steps：
Step 501：Customer side PTP messages separator 901 receives the Ethernet service for being mixed with PTP messages；
Step 502：Customer side PTP messages separator 901 will be sent to correspondingly respectively after PTP messages and general service separation Device handled；
Step 503：Customer side PTP messages separator 901 to the general service separated using existing technology and Processing mode transfers client's side business receiving and processing device 903 and handled, i.e., Ethernet service is encapsulated as ODUk by device 903 Frame, electric cross processing device 906 is transferred to by backboard connecting line and handled；
Step 504：ODUk frames are carried out cross processing by device 906；
Step 505：ODUk frames are encapsulated as OTU frames and sent by line side service apparatus 908；
Step 506：Customer side PTP messages separator 901 is transferred at PTP message concentrations to the PTP messages separated Reason device 905 is handled；
Step 507：Device 905 carries out processing calculating to PTP messages.
Device 905 calculates protocol state machine using BMC (Best Master Clock best master clock) algorithm, during decision Between port state, determine which time port it is enabled receive and it is enabled send time protocol massages, according to the shape of time port State sends specific protocol massages to these ports.
Fig. 6 is that the lateral customer equipment of network element client of the embodiment of the present invention sends the method flow diagram of PTP protocol message, such as Shown in Fig. 6, comprise the following steps：
Step 601：PTP messages centralized processor 405 assembles PTP messages, transfers customer side PTP messages and is incorporated into device 402；
Step 602：Customer side PTP messages are incorporated into device 402 and received to be transferred from client's side business decapsulation dispensing device 404 The common Ethernet service come；
Step 603：Customer side PTP messages, which are incorporated into device 402 and received from PTP messages centralized processor 405, transfers what is come PTP messages；
Step 604：Common ether network packet and PTP messages are mixed and are sent to client-side device.
Fig. 7 and Fig. 8 is the method stream that the network element line side of the embodiment of the present invention and network element line side interact PTP protocol message Cheng Tu, Figure 10 are that the network element line side of the embodiment of the present invention interacts the networking schematic diagram of PTP protocol message with network element line side.This The method that the lateral network element line side of network element circuit of inventive embodiments sends PTP protocol message, as shown in fig. 7, comprises following step Suddenly：
Step 701：The OTU frames that the receiving circuit side of line side PTP signalings separator 1009 is sent；
Step 702：In the reserve bytes of the monitoring OTU frames of line side PTP signalings separator 1009 whether in the form of multi-frame PTP signalings are carried, in this way, then turn to step 706；Otherwise step 703 is turned to；
Step 703：OTU frames solution is ODUk frames by device 1007, is transferred electric cross processing device 1006 and is handled；
Step 704：ODUk frames are carried out a cross processing by device 1006；
Step 705：Client's side business decapsulates dispensing device 1004 and the deblocking of ODUk frames is dressed up into ethernet frame or is packaged into OTUk frames are sent.
Step 706：PTP signaling resolutions are come out, re-group package into PTP messages, the PTP messages solved are transferred into PTP reports Literary centralized processor 1005；
Step 707, PTP messages centralized processor 1005 carry out calculating processing to PTP messages.
Fig. 8 is that the lateral network element line receiver side of network element circuit of the embodiment of the present invention sends the method stream of PTP protocol message Cheng Tu, as shown in figure 8, comprising the following steps：
Exemplified by being docked by wavelength-division network element line side with wavelength-division network element line side, illustrate the PTP messages in wavelength-division network element line side Reception processing step：
Step 801：PTP messages centralized processor 1005 assembles PTP messages and transfers to line side PTP signalings insertion transmission Device 1010；
Step 802：Device 1010, which is received from line side business packed device 1008, transfers the OTN frames of coming；
Step 803：Device 1010, which is received from device 1005, transfers the PTP messages of coming；
Step 804：PTP messages are disassembled into some 1 byte fields by device 1010, and OTN frames are inserted in the form of multi-frame and are retained Byte, sent from line side.
Specifically configurable ranks number only support OTU to retain expense domain, include the 1st row 13-14 bytes, the 2nd row 1-2 words Section, the 4th row 9-14 bytes.
Such as use prior art wavelength-division network network element between can not carry out point-to-point PTP message interactions；It is best at present Method is the processing veneer by newly increasing time transmitting function, so just needs individually to take equipment slots position and individually Transmission channel.
And can then realize that the precise time of wavelength-division network transmits by increasing new device and business processing mode, and newly Increased is all software service, without newly increasing hardware single board, the device of transmission, is not take up equipment slots position and transmission channel.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly Ground, each module/unit in above-described embodiment can be realized in the form of hardware, can also use the shape of software function module Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
The preferred embodiments of the present invention are these are only, certainly, the present invention can also there are other various embodiments, without departing substantially from this In the case of spirit and its essence, those skilled in the art work as can make various corresponding changes according to the present invention And deformation, but these corresponding changes and deformation should all belong to the protection domain of appended claims of the invention.

Claims (8)

1. a kind of method for handling message, including：
Assemble Precision Time Protocol PTP messages；
Sent by the reserve bytes of PTP messages insertion optical transmission unit OTU frame overheads or after being mixed into ether network packet；
Wherein, the PTP messages are inserted to the reserve bytes of OTU frame overheads, including：
The PTP messages are disassembled into several 1 byte fields or multibyte fields, OTU frame overheads are inserted in the form of multi-frame Reserve bytes；
Wherein, transmission after the PTP messages are mixed into ether network packet, including：
Sent after PTP messages and general service are mixed into the Ethernet service of PTP messages.
2. the method as described in claim 1, it is characterised in that：It is described to open PTP messages insertion optical transmission unit OTU frames The reserve bytes of pin are mixed into ether network packet and included：
The PTP messages are periodically inserted into the reserve bytes of OTU frame overheads or are mixed into ether network packet.
3. the method as described in claim any one of 1-2, it is characterised in that：Also include：
After receiving Ethernet service, detect whether the Ethernet service includes PTP messages, such as include PTP messages, then from institute State and the PTP messages are isolated in Ethernet service.
4. the method as described in claim any one of 1-2, it is characterised in that：Also include：
After receiving OTU frames, detect whether the OTU frames carry PTP messages, such as carry PTP messages, then from the OTU frames Parse the PTP messages.
5. a kind of network element device, including：
First module, for assembling Precision Time Protocol PTP messages, the PTP messages are sent to the second module and/or the 3rd Module；
Second module, for will be sent after the reserve bytes of PTP messages insertion optical transmission unit OTU frame overheads；
3rd module, for being sent after the PTP messages are mixed with ether network packet；
Wherein, the PTP messages are inserted to the reserve bytes of OTU frame overheads, including：
The PTP messages are disassembled into several 1 byte fields or multibyte fields, OTU frame overheads are inserted in the form of multi-frame Reserve bytes；
Wherein, transmission after the PTP messages are mixed into ether network packet, including：
Sent after PTP messages and general service are mixed into the Ethernet service of PTP messages.
6. network element device as claimed in claim 5, it is characterised in that：
First module, specifically for the PTP messages periodically are sent into the second module and/or the 3rd module.
7. the network element device as described in claim any one of 5-6, it is characterised in that：Also include：
4th module, after receiving Ethernet service, detect whether the Ethernet service includes PTP messages, such as include PTP messages, then the PTP messages are isolated from the Ethernet service.
8. the network element device as described in claim any one of 5-6, it is characterised in that：Also include：
5th module, after receiving OTU frames, detect whether the OTU frames carry PTP messages, such as carry PTP messages, then The PTP messages are parsed from the OTU frames.
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