CN102843293A - Method for processing message and network element equipment - Google Patents

Method for processing message and network element equipment Download PDF

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Publication number
CN102843293A
CN102843293A CN2012102965522A CN201210296552A CN102843293A CN 102843293 A CN102843293 A CN 102843293A CN 2012102965522 A CN2012102965522 A CN 2012102965522A CN 201210296552 A CN201210296552 A CN 201210296552A CN 102843293 A CN102843293 A CN 102843293A
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Prior art keywords
message
ptp
ptp message
network element
frame
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CN2012102965522A
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CN102843293B (en
Inventor
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

Abstract

The invention provides a method for processing a message and network element equipment. The method comprises the steps of assembling a precise time protocol (PTP) message, and inserting the PTP message into a reserved byte spent by an optical transmission unit (OTU) frame or mixing the PTP message into an Ethernet message to transmit. According to the method, interaction of the PTP protocol message can be achieved between network elements of a wavelength division network, so that the PTP protocol message can be transferred and analyzed among the network elements, so as to transfer the wavelength division network at a precise time.

Description

A kind of processing method of message and network element device
Technical field
The present invention relates to the light wave branch communications field, realize wavelength-division system the whole network elementary time is synchronous and precise time transmits processing method of message and network element device.
Background technology
Traditional TDM (Time Division Multiplex; Time division multiplexing) network (PDH (Plesiochronous Digital Hierarchy; PDH)/SDH (Synchronous Digital Hierarchy; Synchronous digital hierarchy) when transmitting TDM professional (like E1/T1), accurate transmission clock information, receiving terminal can recover business according to the clock information of extraction.Simultaneously, the TDM circuit can also provide synchronous refernce clocks for some application network, and commonplace application is Backhaul (the moving backhaul) network that moves.Along with WDM (Wavelength Division Multiplexing; Wave division multiplexing) system develops to directions such as many carryings, multi-service and intellectualities; Network quality, business service type to wavelength-division system are had higher requirement, and also need realize the time synchronized of the whole network and the precise time function is provided.
PTP (Precision Time Protocol according to the IEEE1588v2 definition; Precision Time Protocol); Through be used for realizing the network precise time to the time protocol signaling be filled in TCP (Transmission Control Protocol transmission control protocol)/UDP (User Datagram Protocol with payload (load) form; UDP) in the layer message, through IP layer and Ethernet encapsulation, perhaps directly protocol signaling is encapsulated with the Ethernet form again; Between each node of network, carry out point-to-point mutual transmission and parsing and processing, realize the time synchronized of the whole network and the precise time function is provided.Present number is logical, PTN (Packet Transport Network, Packet Transport Network) network generally adopts this mode.
And the characteristics of wavelength-division network are in order to realize big capacity, long-distance transmissions, customer service have been carried out the encapsulation of OTU (Optical Transform Unit, optical transmission unit) frame; Its apparatus is as shown in Figure 1, and typical networking mode is as shown in Figure 2, and wavelength-division system is as shown in Figure 3 to the one-way traffic flow processing mode and the step of user's Ethernet service:
Shown in Figure 3 is the typical wavelength-division network of being made up of three wavelength-division network elements; Customer service inserts from client side, converges after the intersection to be packaged into the OTUk frame, is sent to next network element and handles; OTU frame up to having encapsulated customer service is sent to the purpose network element; Decapsulation again reverts to customer service, sends from client's side plate.Concrete steps are:
Step 301: wavelength-division network device client side business receiving system 201 receives user's GE (GigabitEthernet; Gigabit Ethernet)/FE (FastEthernet; Fast Ethernet) business; Ethernet service is encapsulated as the ODUk frame, sends to professional electric cross processing device 203 through the backboard connecting line;
Step 302: electric cross processing device 203 carries out cross processing with business, and the ODUk frame that will carry out after the cross processing sends to the professional encapsulation in line side dispensing device 205 through the backboard connecting line;
Step 303: line side professional encapsulation dispensing device 205 is packaged into the OTU frame with the ODUk frame, sends to network element 2;
Step 304: the line side service receiving device 209 of network element 2 receives that the OTU frame is descapsulated into the ODUk frame, is sent to electric cross processing device 208;
Step 305: electric cross processing device 208 carries out cross processing with business, and the ODUk frame that will carry out after the cross processing sends to the professional encapsulation in line side dispensing device 210 through the backboard connecting line;
Step 306: line side professional encapsulation dispensing device 210 is packaged into the OTU frame with the ODUk frame, sends to network element 3;
Step 307: the line side service receiving device 214 of network element 3 receives that the OTU frame is descapsulated into the ODUk frame, is sent to electric cross processing device 213;
Step 308: electric cross processing device 213 carries out cross processing with business; The ODUk frame that will carry out after the cross processing sends to the professional decapsulation dispensing device 212 of client side through the backboard connecting line;
Step 309: the professional decapsulation dispensing device of client side 212 is descapsulated into Ethernet service with the ODUk frame, sends to customer equipment;
In this process, business all be always form with ODUk, OTU frame in transmission through network, be a kind of transmission mode fully end to end.And the PTP protocol massages need be encapsulated in carry out in the ethernet frame format mutual; Adopt existing this technology; The PTP protocol massages can't be stripped from out in the line side; Wavelength-division network can't be implemented between each network element transmission and the parsing to the Ethernet message, thus can't between each network element, transmit and resolve the network precise time to the time protocol signaling, realized not the whole network time synchronized and the function that precise time is provided.
Summary of the invention
The technical problem that the present invention will solve provides a kind of processing method of message and network element device; To realize that between the wavelength-division network network element PTP protocol massages is mutual; Make and to transmit and to resolve the PTP protocol massages between each network element, thereby the precise time of realizing wavelength-division network transmits.
In order to solve the problems of the technologies described above, the invention provides a kind of processing method of message, comprising:
Assembling Precision Time Protocol (PTP) message;
Said PTP message is inserted the reserve bytes of optical transmission unit (OTU) frame overhead or is mixed into back transmission in the Ethernet message.
Further, said method also has following characteristics: said reserve bytes with said PTP message insertion OTU frame overhead comprises:
Said PTP message is disassembled into several 1 byte field or multibyte field, insert the reserve bytes of OTU frame overhead with the multi-frame form.
Further, said method also has following characteristics: said said PTP message is inserted the reserve bytes of optical transmission unit (OTU) frame overhead or is mixed in the Ethernet message comprise:
Periodically said PTP message is inserted the reserve bytes of OTU frame overhead or be mixed in the Ethernet message.
Further, said method also has following characteristics: also comprise:
After receiving Ethernet service, detect said Ethernet service and whether comprise the PTP message, as comprise the PTP message, then from said Ethernet service, isolate said PTP message.
Further, said method also has following characteristics: also comprise:
After receiving the OTU frame, detect said OTU frame and whether carry the PTP message, as carry the PTP message, then from said OTU frame, parse said PTP message.
In order to address the above problem, the present invention also provides a kind of network element device, comprising:
First module is used to assemble Precision Time Protocol (PTP) message, and said PTP message is sent to second module and/or three module;
Said second module is used for sending behind the reserve bytes with said PTP message insertion optical transmission unit (OTU) frame overhead;
Said three module is used for that said PTP message is mixed the back with the Ethernet message and sends.
Further, said network element equipment also has following characteristics:
Said second module specifically is used for said PTP message is disassembled into several 1 byte field or multibyte field, sends behind the reserve bytes with multi-frame form insertion OTU frame overhead.
Further, said network element equipment also has following characteristics:
Said first module specifically is used for periodically said PTP message being sent to second module and/or three module.
Further, said network element equipment also has following characteristics: also comprise:
Four module after being used to receive Ethernet service, detects said Ethernet service and whether comprises the PTP message, as comprises the PTP message, then from said Ethernet service, isolates said PTP message.
Further, said network element equipment also has following characteristics: also comprise:
The 5th module, be used to receive the OTU frame after, detect said OTU frame and whether carry the PTP message, as carry the PTP message, then from said OTU frame, parse said PTP message.
To sum up, the present invention provides a kind of processing method of message and network element device, can realize that between the wavelength-division network network element PTP protocol massages is mutual, make and can transmit and resolve the PTP protocol massages between each network element, thereby the precise time of realizing wavelength-division network transmits.
Description of drawings
Fig. 1 is existing wavelength-division net element business processing unit;
Fig. 2 typical case wavelength-division network element group network sketch map;
Fig. 3 is the existing unidirectional Ethernet service process chart of wavelength-division network element;
Fig. 4 is the sketch map of the wavelength-division network element device of the embodiment of the invention;
Fig. 5 is the flow chart of the method for the PTP protocol massages sent of the network element client side device processes customer equipment of the embodiment of the invention;
Fig. 6 is that the network element client side equipment of the embodiment of the invention sends the flow chart of the method for PTP protocol massages to customer equipment;
Fig. 7 is that the network element line side equipment of the embodiment of the invention sends the flow chart of the method for PTP protocol massages to the network element line side:
Fig. 8 is that the network element line side equipment of the embodiment of the invention sends the flow chart of the method for PTP protocol massages to network element circuit receiver side;
Fig. 9 is the network element client side equipment of the embodiment of the invention and the networking sketch map of the mutual PTP protocol massages of customer equipment;
Figure 10 is the networking sketch map of the mutual PTP protocol massages in network element line side and network element line side of the embodiment of the invention;
Figure 11 is the OTU frame overhead reserved word location drawing of the embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
For realize that the PTP protocol massages carries out alternately between each network element of wavelength-division network; And don't take service channel, and can the PTP message be disassembled into some 1 byte field or multibyte field, be filled into frame in the reserve bytes of OTUk frame; Pass to the opposite end; Opposite equip. is resolved this field, extracts the back and reformulates the PTP protocol massages, gives the PTP protocol processing unit and handles.
The sketch map of the wavelength-division network element of the embodiment of the invention, as shown in Figure 4, data interaction was all accomplished through the backboard connecting line between each installed in the wavelength-division network element;
Comprise identical with original technology with lower module:
The professional receiving and processing device 403 of client side is used to receive the client side Ethernet service and is packaged into the ODUk frame;
The professional decapsulation dispensing device 404 of client side is used for the ODUk frame is descapsulated into Ethernet service;
Electricity cross processing device 406 is used for the ODUk frame is carried out cross processing;
The professional receiving and processing device 407 in line side is used for the OTU frame is descapsulated into the ODUk frame;
The professional packaging system 408 in line side is used for the ODUk frame is encapsulated as the OTU frame;
Also comprise increase newly with lower module:
Client side PTP message separator 401 is used for the Ethernet message that comprises PTP information is separated from client traffic;
Client side PTP message is incorporated into device 402, is used for that the PTP signaling is incorporated into client traffic and sends;
PTP message centralized processor 405 is used for the PTP signaling is focused on calculating, and it is mutual to carry out the PTP protocol signaling;
Line side PTP signaling separator 409 is used for the OTU frame of receiving lines side, the PTP signaling is separated from the OTU frame recover out;
Line side PTP signaling is inserted dispensing device 410; Be used for to contain the reserve bytes of the message of PTP signaling with multi-frame form insertion OTU frame overhead; The reserve bytes of this OTU frame overhead can be positioned at the 1st row 13-14 byte of OTU frame, the 2nd row 1-2 byte, the 4th row 9-14 byte; PTP expense position is configurable, and is shown in figure 11;
The employed method of the embodiment of the invention; Adopted PTP message branch to transmit; Focus on, will transmit in the line side through the mode of inserting OTU frame overhead reserve bytes, realized that the PTP protocol massages between each network element is mutual with the PTP signaling that ethernet frame carries.
Fig. 5 and Fig. 6 are the flow charts of method of network element client side and the mutual PTP protocol massages of customer equipment of the embodiment of the invention;
Fig. 9 is the network element client side of the embodiment of the invention and the networking sketch map of the mutual PTP protocol massages of customer equipment (is example with PTN equipment).
Be example with wavelength-division network element client side and PTN equipment interconnection, as shown in Figure 5, may further comprise the steps:
Step 501: client side PTP message separator 901 receives the Ethernet service that is mixed with the PTP message;
Step 502: client side PTP message separator 901 with the PTP message with deliver to corresponding device after general service is separated respectively and handle;
Step 503: 901 pairs of general servicies of separating of client side PTP message separator adopt existing technology and processing mode to pass on the professional receiving and processing device 903 of client side and handle; Promptly install 903 Ethernet service is encapsulated as the ODUk frame, be transferred to electric cross processing device 906 through the backboard connecting line and handle;
Step 504: device 906 carries out cross processing with the ODUk frame;
Step 505: line side service apparatus 908 is encapsulated as the OTU frame with the ODUk frame and sends;
Step 506: the PTP message that 901 pairs of client side PTP message separators are separated passes on PTP message centralized processor 905 to be handled;
Step 507: install 905 pairs of PTP messages and handle calculating.
Device 905 uses BMC (Best Master Clock best master clock) algorithm computation protocol state machine; The state of decision time port; Determine which time port to enable to receive and enable the transmitting time protocol massages, send the certain protocol message to these ports according to the state of time port.
Fig. 6 is the method flow diagram of the network element client side of the embodiment of the invention to customer equipment transmission PTP protocol massages, and is as shown in Figure 6, may further comprise the steps:
Step 601:PTP message centralized processor 905 assembling PTP messages, the client side PTP message that passes on is incorporated into device 902;
Step 602: client side PTP message is incorporated into device 902 and receives the common Ethernet service that passes on from the professional decapsulation dispensing device 904 of client side;
Step 603: client side PTP message is incorporated into device 902 and receives the PTP message that passes on from PTP message centralized processor 905;
Step 604: common Ethernet message and PTP message are mixed the client side equipment that sends to.
Fig. 7 and Fig. 8 are the method flow diagrams of the mutual PTP protocol massages in network element line side and network element line side of the embodiment of the invention, and Figure 10 is the networking sketch map of the mutual PTP protocol massages in network element line side and network element line side of the embodiment of the invention.The method that the PTP protocol massages is sent to the network element line side in the network element line side of the embodiment of the invention, as shown in Figure 7, may further comprise the steps:
Step 701: the OTU frame that line side PTP signaling separator 1009 receiving lines sides are sent;
Step 702: whether carry the PTP signaling in the reserve bytes of line side PTP signaling separator 1009 monitoring OTU frames, in this way, then turn to step 706 with the multi-frame form; Otherwise turn to step 703;
Step 703: device 1007 is separated the frame into ODUk with the OTU frame, and the electric cross processing device 1006 that passes on is handled;
Step 704: device 1006 carries out a cross processing with the ODUk frame;
Step 705: the professional decapsulation dispensing device 1004 of client side is dressed up ethernet frame with ODUk frame deblocking or is packaged into the OTUk frame and sends.
Step 706: the PTP signaling is parsed, and group is bundled into the PTP message again, and the PTP message that solves is passed on PTP message centralized processor 1005;
Step 707,1005 pairs of PTP messages of PTP message centralized processor carry out computing.
Fig. 8 is the method flow diagram of the network element line side of the embodiment of the invention to network element circuit receiver side transmission PTP protocol massages, and is as shown in Figure 8, may further comprise the steps:
Docking with wavelength-division network element line side with wavelength-division network element line side is example, explains that the PTP message in wavelength-division network element line side receives treatment step:
Step 801:PTP message centralized processor 1005 assembling PTP messages transfer to line side PTP signaling and insert dispensing device 1010;
Step 802: device 1010 receives the OTN frame that professional packaging system 1008 passes on from the line side;
Step 803: device 1010 receives from installing 1005 and passes on the PTP message that comes;
Step 804: device 1010 is disassembled into some 1 byte field with the PTP message, inserts OTN frame reserve bytes with the multi-frame form, sends from the line side.
Concrete configurable ranks number only support OTU to keep the expense territory, comprise the 1st row 13-14 byte, the 2nd row 1-2 byte, the 4th row 9-14 byte.
As adopt between the prior art wavelength-division network network element and can't carry out point-to-point PTP message interaction; The best way is through increasing the processing veneer of time transmitting function newly, so just need taking an equipment slots position and independent transmission channel separately at present.
Transmit through increasing the precise time that new device and Business Processing mode then can realize wavelength-division network, and what increase newly all is software service, need not to increase newly hardware single board, the device of transmission, do not take equipment slots position and transmission channel.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
More than be merely the preferred embodiments of the present invention; Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1. handle method of message for one kind, comprising:
Assembling Precision Time Protocol (PTP) message;
Said PTP message is inserted the reserve bytes of optical transmission unit (OTU) frame overhead or is mixed into back transmission in the Ethernet message.
2. the method for claim 1 is characterized in that: the said reserve bytes that said PTP message is inserted the OTU frame overhead comprises:
Said PTP message is disassembled into several 1 byte field or multibyte field, insert the reserve bytes of OTU frame overhead with the multi-frame form.
3. the method for claim 1 is characterized in that: said said PTP message is inserted the reserve bytes of optical transmission unit (OTU) frame overhead or is mixed in the Ethernet message comprise:
Periodically said PTP message is inserted the reserve bytes of OTU frame overhead or be mixed in the Ethernet message.
4. like each described method of claim 1-3, it is characterized in that: also comprise:
After receiving Ethernet service, detect said Ethernet service and whether comprise the PTP message, as comprise the PTP message, then from said Ethernet service, isolate said PTP message.
5. like each described method of claim 1-3, it is characterized in that: also comprise:
After receiving the OTU frame, detect said OTU frame and whether carry the PTP message, as carry the PTP message, then from said OTU frame, parse said PTP message.
6. network element device comprises:
First module is used to assemble Precision Time Protocol (PTP) message, and said PTP message is sent to second module and/or three module;
Said second module is used for sending behind the reserve bytes with said PTP message insertion optical transmission unit (OTU) frame overhead;
Said three module is used for that said PTP message is mixed the back with the Ethernet message and sends.
7. network element device as claimed in claim 6 is characterized in that:
Said second module specifically is used for said PTP message is disassembled into several 1 byte field or multibyte field, sends behind the reserve bytes with multi-frame form insertion OTU frame overhead.
8. network element device as claimed in claim 6 is characterized in that:
Said first module specifically is used for periodically said PTP message being sent to second module and/or three module.
9. like each described network element device of claim 6-8, it is characterized in that: also comprise:
Four module after being used to receive Ethernet service, detects said Ethernet service and whether comprises the PTP message, as comprises the PTP message, then from said Ethernet service, isolates said PTP message.
10. like each described network element device of claim 6-8, it is characterized in that: also comprise:
The 5th module, be used to receive the OTU frame after, detect said OTU frame and whether carry the PTP message, as carry the PTP message, then from said OTU frame, parse said PTP message.
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