CN1852265A - Method for synchronous frame transmitting on IP network and network apparatus for transmission - Google Patents
Method for synchronous frame transmitting on IP network and network apparatus for transmission Download PDFInfo
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Abstract
Network equipment at sending end packs several data frames received early or late into IP data packet, and sends the IP data packet to network equipment at receiving end through IP network. Data frame in IP data packet stores recorded timestamp of transmission time difference between adjacent data frames. Based on comparison between time interval of data frame received successively and data frame stored timestamp, the network equipment at receiving end determines whether the received IP data packet is transmitted out. Moreover, through types, sequence number id in IP data packet, the method determines whether reception is correct in order to decide whether to ask the sending end to do retransfer. Features are: realizing synchronous transmission of data frame, increasing use ratio of bandwidth, and raising transmission efficiency.
Description
Technical field
The present invention relates to data transmission technology, relate in particular to a kind of synchronization frame and go up the method for transmission and be used to the network equipment of transmission at Internet protocol (IP:InternetProtocol).
Background technology
At present, synchronization frame is based on that the mode of transmission control protocol (TCP:Transfer ControlProtocol) or User Datagram Protoco (UDP) (UDP:User Datagram Protocol) transmits in the prior art.The networking structure of this transmission means is as shown in Figure 1: synchronous serial interface device A links to each other by the synchrodata cable with network equipment A, network equipment B, C link to each other by synchronizing cable with synchronous serial interface device B, C respectively, and network equipment A, B, C connect by IP network then.
The course of work of above-mentioned transmission means is specially: synchronous serial interface device A sends data to network equipment A by synchronizing cable, network equipment A is again by TCP or UDP mode then, data are added IP stem and TCP stem or IP stem and UDP stem, send to then on network equipment B and the network equipment C, network equipment B gets on synchronous serial interface device B, the C that reduction of data becomes the synchronous serial interface data to send to correspondence with network equipment C again.
In above-mentioned transmission course, the message transmission frequency of needs maintenance transmitting terminal and the message receive frequency of receiving terminal are approaching or identical, and promptly two ends need keep synchronous.Simultaneous techniques in the transmission course is the important technology of synchronization frame in TCP or UDP.
In addition, in above-mentioned transmission course, efficiency of transmission also is a very important factor.IP datagram Wen Geshi behind the synchronization frame process network equipment A is shown in Fig. 2 A and 2B, and wherein Fig. 2 A is the IP datagram Wen Geshi based on the TCP mode, partly adds the IP stem of 20 bytes and the TCP stem of 20 bytes at original synchrodata frame.And Fig. 2 B is the IP datagram Wen Geshi based on the UDP mode, is partly to add the IP stem of 20 bytes and the UDP stem of 8 bytes at original synchrodata frame.
Obviously, the prior art synchronization frame carries out transmission manner on TCP or UDP basis, owing to will on original synchrodata frame part basis, increase TCP stem or UDP stem, therefore can give the very big burden of network increase of transfer resource anxiety, reduce the efficient of Network Transmission.In addition, because the own characteristic of TCP mode or UDP mode, promptly TCP mode connection request and data retransmission can cause device performance seriously to descend; And the UDP mode is carried out transfer of data and the packet loss phenomenon can be occurred, influences the integrality of data, brings unreliable factor for the transmission of data.
Summary of the invention
The technical problem that the present invention solves is to provide the network equipment of a kind of synchronization frame in that the method for transmitting on the IP network and synchronization frame transmit on IP, can guarantee that the frequency of transmitting terminal and receiving terminal synchronization frame is identical or approaching.
In addition, the present invention can also reduce the encapsulation to original synchrodata frame, can increase bandwidth availability ratio greatly, improves efficiency of transmission.
The technical scheme that realizes the object of the invention is as follows:
The method that a kind of synchronization frame transmits on IP network, wherein:
The synchronous serial interface device of transmitting terminal is sent to the coupled network equipment with Frame, this network equipment is packaged into the IP packet with several Frames that successively receive, send to the receiving terminal network equipment by IP network, the Frame in the described IP packet stores the timestamp of transmitting time difference between the record adjacent data frames;
The receiving terminal network equipment receives the IP packet, compares according to time interval of the Frame that successively receives timestamp with the Frame storage, if both equal or differences are then proceeded the synchronous transmission of subsequent data frame in tolerance; If the time interval less than timestamp, is then waited both equate or difference in tolerance, proceed the synchronous transmission of subsequent data frame again; If interval greater than timestamp, then abandon the IP packet.
Described IP packet has type identification and sequence number sign.
The described receiving terminal network equipment judges according to type identification and sequence number sign, if correctly then the IP packet is split as several Frames.
Wherein, if the described receiving terminal network equipment does not correctly receive the IP packet of certain sequence number, then send the feedback message to the transmitting terminal network equipment, the type mark of described feedback message is for retransmitting, and sequence number is labeled as the IP packet of this sequence number; The transmitting terminal network equipment resends to the receiving terminal network equipment according to the IP packet of the feedback message of receiving with this sequence number in the buffering area; If the described transmitting terminal network equipment can't send the IP packet of this sequence number, then send message and inform the receiving terminal network equipment.
Distinguished by special identifier between several Frames in the IP packet of described encapsulation, the character identical with described special identifier carries out the escape processing in the Frame; The IP packet of described fractionation is split as several Frames according to this special identifier, reduces processing through the character of escape in each Frame.
In addition, the network equipment that the present invention also provides a kind of synchronization frame to transmit on IP comprises:
IP processing data packets unit, several Frames that are used for successively receiving are packaged into the IP packet; Or the IP packet that is used for receiving from IP network is split as several Frames;
The synchronised clock unit is used for the timestamp of transmitting time difference between described Frame timestamp unit record adjacent data frames; Or compare according to time interval of the Frame that successively receives timestamp with the Frame storage, if both equal or differences are then proceeded the synchronous transmission of subsequent data frame in tolerance; If the time interval less than timestamp, is then waited both equate or difference in tolerance, proceed the synchronous transmission of subsequent data frame again; If interval greater than timestamp, then abandon the IP packet.
The IP data envelope is dressed up the packet that has type identification and sequence number sign in described IP processing data packets unit.
The described network equipment judges according to type identification and sequence number sign whether the IP packet that receives is correct, if correctly do not receive the IP packet of certain sequence number, then send the feedback message to the transmitting terminal network equipment, the type mark of described feedback message is for retransmitting, and sequence number is labeled as the IP packet of this sequence number; The transmitting terminal network equipment resends to the receiving terminal network equipment according to the IP packet of the feedback message of receiving with this sequence number in the buffering area; If the described transmitting terminal network equipment can't send the IP packet of this sequence number, then send message and inform the receiving terminal network equipment.
Described IP processing data packets unit package IP packet is to increase special identifier between several Frames, escape is done in character identical with described special identifier in the Frame handle; It is to split into several Frames according to this special identifier that described IP processing data packets unit splits the IP packet, handles doing reduction through the character of escape in the Frame.
The present invention by existing a bit to any or a bit under the data-transmission mode to multiple spot, after several Frames packings, stab memory time in each Frame of IP packet, to write down the time difference that this Frame and previous Frame send.Timestamp when sending with reality by the timestamp of judging the Frame that receiving terminal receives determines whether receiving the IP packet.The timestamp when if the timestamp of the Frame that receiving terminal receives sends less than reality, then receiving terminal is waited for to the timestamp when timestamp equals actual transmission, Frame is sent again; The timestamp when if the timestamp of the Frame that receiving terminal receives sends greater than reality, then receiving terminal directly abandons this IP packet.By this timestamp mechanism, can ensure the time interval of receiving data frames largely, ensure the quality that voice transmit to greatest extent.
In addition, the present invention just can realize the high-speed transfer of synchrodata frame on IP by only increase the sign of an IP stem and several bytes before packet.The IP packet of the present invention's structure need not to carry out agreement and judges owing to there is not protocol header in transmission course, therefore be more suitable in the transfer of data of no-protocol situation.
More specifically be type identification and sequence number sign, judge that according to the type sign and sequence number sign the receiving terminal decision abandons or receive the IP packet by in the IP packet, being provided with.When receiving terminal does not receive the IP packet of certain sequence number, after the feedback message that transmitting terminal sends by receiving terminal is learnt, the IP packet to should sequence number that is stored in the buffer memory is transmitted again; Otherwise transmission types is labeled as the IP packet of this sequence number of nothing to the receiving terminal network equipment, informs that receiving terminal does not have the IP packet of corresponding sequence number, just need not after receiving terminal is learnt to continue to wait for.By this retransmission mechanism, only need selectively to retransmit, ensured largely and the integrality that the synchrodata frame transmits also improved efficiency of transmission.
In addition,, between each Frame, distinguished, and character identical with described special identifier in the Frame is carried out escape handle by special identifier by several Frames being packaged as an IP packet; Corresponding with it, when splitting the IP packet, split, and will reduce processing through the character of escape in each Frame according to this special identifier.By this Frame packing mechanism, can further improve efficiency of transmission to a certain extent.
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Description of drawings
Fig. 1 prior art transmission means networking schematic diagram;
Fig. 2 A, B are respectively existing tcp data bag and UDP message packet format schematic diagram;
Fig. 3 is the method flow diagram of synchrodata frame transmission of the present invention;
Fig. 4 is an embodiment of the invention synchrodata frame transmission schematic diagram;
Fig. 5 is the device schematic diagram that the embodiment of the invention is used for the transmission of synchrodata frame;
Fig. 6 is that embodiment of the invention IP packet forms schematic diagram;
Fig. 7 A, B are embodiment of the invention IP data packet format schematic diagrames;
Fig. 8 A, B are embodiment of the invention Frame packing schematic diagrames.
Embodiment
At first, be that example illustrates simultaneous techniques of the present invention with Fig. 1 and Fig. 6.After network equipment A received Frame from synchronous serial interface device A, in the byte that this data frame header joining day stabs, to first Frame that receives, its timestamp byte was designated as T1; To second Frame that receives, its time stamp is T2, wherein T2 is the time that receives second Frame and the time interval that receives first Frame, to the 3rd Frame that receives, its timestamp byte is designated as T3, and wherein T3 is the time of the 3rd data receiving and the time interval of second Frame that receives.For follow-up Frame according to this mode carry out the setting of timestamp byte.In addition, the calculating of this timestamp value can also send the time interval calculating of Frame with network equipment A.Analogy when sending first Frame, is provided with t1 with its timestamp byte; When sending second Frame, its timestamp byte value is set to t2, and wherein t2 is for sending second Frame and the time interval that sends first Frame; When sending the 3rd Frame, be set to t3 in its timestamp byte, wherein t3 is for sending the 3rd Frame and the time interval that sends second Frame, and follow-up Frame mode according to this carries out the setting of timestamp byte.
Receiving terminal network equipment B receives after first synchrodata frame, write down a time value I1, receive second Frame, second time value I2 of record later on, if I2 equate with T2 or t2 with difference between the I1, continue the synchronous of subsequent data frame so.If the difference between I2 and the I1 greater than T2 or t2, then directly abandons this Frame, carry out again Frame next time synchronously; If when the difference between I2 and the I1, is then waited until I2 less than T2 or t2 and difference between the I1 is equated with T2 or t2, again Frame is sent to the synchronous serial interface equipment B, continue subsequent data frame synchronously.The time interval of transmission Frame and the time interval of receiving data frames can also be provided with a tolerance value, if the difference in aforementioned two time intervals is then proceeded the transmission of Frame within tolerance value scope except equating fully.This tolerance value is a prerequisite with the effect that does not influence synchronous transmission substantially.Such as: the timestamp that sends three Frames be respectively, T1 is 0ms, and T2 is 20ms, and T3 is 40ms, and the time interval that receives three Frames is, I1 is 0ms, and I2 is 21ms, I3 is 41ms, and the tolerance value is made as 2ms, and these three Frames can receive so.By above-mentioned synchronization mechanism, can ensure the data transmission time interval and the consistency in the Data Receiving time interval largely.
Below, shown in Fig. 7 A, describe the form of IP packet among the present invention program in detail.The IP packet is divided into quinquepartite, promptly IP stem, type identification, sequence number sign, packet, and verification and, wherein:
IP stem: 20 bytes;
Type identification: 1 byte,
Specifically be divided into three kinds:
Class1: be set to 0, expression " transmission ",
Type 2: be set to 1, expression " repeating transmission ",
Type 3: be set to 2, expression " not having this sequence number message ";
Sequence number sign: 4 bytes, increase progressively since 0, increase and return to 0 after the maximum and restart;
Packet: for a plurality of Frame packings form, distinguished by special identifier between each Frame, the character identical with described special identifier needs escape to handle in the Frame; And timestamp is set before each Frame, and be the time interval that Frame and previous Frame send, be a time difference, unit millisecond (ms);
Verification and: 2 bytes.
Below, as shown in Figure 3, Figure 4, describe the method step of synchronization frame of the present invention high-speed transfer on IP in detail.
The synchronous serial interface device of step 1, transmitting terminal is sent to the coupled network equipment with several Frames;
Step 3, the receiving terminal network equipment receive the IP packet that sends over from transmitting terminal by IP network;
If step 5 equates, then be determined further according to type identification and sequence number sign:
At first judge type identification,, then continue to judge the sequence number sign, if sequence number is incorrect, then enter step 9, otherwise continue if type is 0 (transmission);
If step 6 sequence number is correct, then the receiving terminal network equipment is split as several Frames with the packet in the IP packet by special terminating symbol, and makes the character that escape handles will send the time and reduce; Frame and the interval of the transmission between the frame according to the timestamp record send to corresponding network serial port device with several Frames;
During the timestamp when if the timestamp of the Frame that this receiving terminal receives sends less than reality, receiving terminal is waited for to the timestamp when timestamp equals actual transmission, Frame is sent again;
If during the timestamp the when timestamp of the Frame that receiving terminal receives sends greater than reality, receiving terminal directly abandons the IP packet;
Step 8, lose the IP packet.
If the step 9 receiving terminal network equipment does not correctly receive the IP packet of certain sequence number, then send the feedback message to the transmitting terminal network equipment.The type mark of feedback message is 1 (repeating transmission), and sequence number is labeled as the sequence number of required IP packet; The transmitting terminal network equipment is searched in buffering area according to the mark in the feedback message of receiving, if find corresponding IP packet, then it is resend to the receiving terminal network equipment; Otherwise transmission types is labeled as the message of 2 (not having this sequence number message) to the receiving terminal network equipment, to inform that receiving terminal need not continue to wait for again.Type 2 or 3 message format are shown in Fig. 6 B.
Below, describe the process that Frame of the present invention is packed in detail.A plurality of Frame packings mainly are to be applied on the network equipment of transmitting terminal and receiving terminal, and transmit leg is finished the packing process of packet, and the recipient finishes the separation process of packet.Shown in Fig. 8 A, write down the process of the packing of five Frames, specifically describe as follows:
Add special terminating symbol in the back of each Frame, for example: two hexadecimal 0x7e0x7e.When the receiving terminal network equipment is received terminating symbol, think that a Frame collects, serial ports sent in the past.When the character that occurs in the Frame as terminating symbol, to carry out the escape operation to this character, make the end mark composition and division in a proportion of message be easier to identification, for example: if use two hexadecimal 0x7e0x7e as end mark, will carry out escape to the 0x7e in the message, add the another one character thereafter, thereby make and can not occur two 0x7e continuously in the message, can not that existing two 0x7e connect together in the message simultaneously yet, thereby avoid being not easy identification.
This mode needs to occur in pairs, and promptly transmitting terminal carries out the packing operation of Frame, and receiving terminal carries out lock out operation to packet, and packing process and separation process are just in time opposite, shown in Fig. 8 B.Packing process is needing the character of escape to carry out escape, and the character that separation process needs to do escape restores, thereby finishing Frame closes from assigning to, and from being incorporated into the process of branch, thereby realizes the synchronous transmission of a plurality of frames.
Describe the system that the present invention realizes synchronization frame high-speed transfer on IP in detail in conjunction with Fig. 4 and Fig. 5:
As shown in Figure 5, this system is divided into three parts, promptly transmitting terminal, IP network, be receiving terminal, wherein: transmitting terminal comprises the synchronous serial interface device and the network equipment; Receiving terminal comprises the network equipment and synchronous serial interface device, is connected on the IP network by its corresponding network device between transmitting terminal synchronous serial interface device and the receiving terminal synchronous serial interface device.
With a transmitting terminal, two receiving terminals are example, specify as follows below: transmitting terminal synchronous serial interface device 51 is sent to the coupled transmitting terminal network equipment 52 with Frame;
The transmitting terminal network equipment 52 further comprises IP processing data packets unit and synchronised clock unit, wherein:
IP processing data packets unit, several Frames that are used for successively receiving are packaged into the IP packet that has type identification and sequence number sign; Encapsulation IP packet is to increase special identifier between several Frames, escape is done in character identical with described special identifier in the Frame handle;
The synchronised clock unit is used for the timestamp of transmitting time difference between the Frame of described IP packet record adjacent data frames;
The transmitting terminal network equipment 52 is received the Frame that synchronous serial interface equipment 51 sends over, Frame is encapsulated, if a plurality of Frames are at first arranged, the processing of a plurality of Frames need being packed, promptly add special end sign, simultaneously the Frame identical character of this special end sign that neutralizes is carried out escape and handles in each Frame back; Be the time stamp of first Frame that will send 0 then, the timestamp of next Frame is exactly the time difference that sends with first Frame.Type is set to 0 (transmission) at last; Sequence number begins counting at first IP packet that connects, and increases progressively since 0; Simultaneously calculation check and.The transmitting terminal network equipment 52 sends to packaged IP packet the network equipment of receiving terminal by IP network;
The receiving terminal network equipment 53,55 further comprises IP processing data packets unit and synchronised clock unit, wherein:
IP processing data packets unit, the IP packet that is used for receiving from IP network is split as several Frames; It is to split into several Frames according to this special identifier that described IP processing data packets unit splits the IP packet, handles doing reduction through the character of escape in the Frame.
The synchronised clock unit is used for comparing according to time interval of the Frame that successively receives timestamp with the Frame storage, if both equal or differences are then proceeded the synchronous transmission of subsequent data frame in tolerance; If the time interval less than timestamp, is then waited both equate or difference in tolerance, proceed the synchronous transmission of subsequent data frame again; If the time interval less than timestamp, then abandons the IP packet.
The receiving terminal network equipment 53,55 receives the IP packet that sends by IP network, at first removes the IP stem of IP packet, then calculation check and and compare, specifically be that verification and part are changed to the value that the XOR gained is calculated in 0 back earlier.The value that this calculated value is calculated when sending compares, if errorless, judges according to type identification and sequence number sign, if send to corresponding network serial port device after being split as several Frames correctly then with the IP packet again;
Receiving terminal synchronous serial interface device 54,56 is used to receive the Frame that the coupled receiving terminal network equipment sends.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1, the method transmitted on IP network of a kind of synchronization frame is characterized in that:
The synchronous serial interface device of transmitting terminal is sent to the coupled network equipment with Frame, this network equipment is packaged into the IP packet with several Frames that successively receive, send to the receiving terminal network equipment by IP network, the Frame in the described IP packet stores the timestamp of transmitting time difference between the record adjacent data frames;
The receiving terminal network equipment receives the IP packet, compares according to time interval of the Frame that successively receives timestamp with the Frame storage, if both equal or differences are then proceeded the synchronous transmission of subsequent data frame in tolerance; If the time interval less than timestamp, is then waited both equate or difference in tolerance, proceed the synchronous transmission of subsequent data frame again; If interval greater than timestamp, then abandon the IP packet.
2, the method for claim 1 is characterized in that, described IP packet has type identification and sequence number sign.
3, method as claimed in claim 2 is characterized in that, the described receiving terminal network equipment judges according to type identification and sequence number sign, if correctly then the IP packet is split as several Frames.
4, method as claimed in claim 3, it is characterized in that,, then send the feedback message to the transmitting terminal network equipment if the described receiving terminal network equipment does not correctly receive the IP packet of certain sequence number, the type mark of described feedback message is for retransmitting, and sequence number is labeled as the IP packet of this sequence number; The transmitting terminal network equipment resends to the receiving terminal network equipment according to the IP packet of the feedback message of receiving with this sequence number in the buffering area.
5, method as claimed in claim 4 is characterized in that, if the described transmitting terminal network equipment can't send the IP packet of this sequence number, then sends message and informs the receiving terminal network equipment.
As claim 1 or 3 described methods, it is characterized in that 6,, distinguished by special identifier between several Frames in the IP packet of described encapsulation that the character identical with described special identifier carries out the escape processing in the Frame; The IP packet of described fractionation is split as several Frames according to this special identifier, reduces processing through the character of escape in each Frame.
7, the network equipment that transmits on IP of a kind of synchronization frame is characterized in that, comprising:
IP processing data packets unit, several Frames that are used for successively receiving are packaged into the IP packet; Or the IP packet that is used for receiving from IP network is split as several Frames;
The synchronised clock unit is used for the timestamp of transmitting time difference between described Frame timestamp unit record adjacent data frames; Or compare according to time interval of the Frame that successively receives timestamp with the Frame storage, if both equal or differences are then proceeded the synchronous transmission of subsequent data frame in tolerance; If the time interval less than timestamp, is then waited both equate or difference in tolerance, proceed the synchronous transmission of subsequent data frame again; If interval greater than timestamp, then abandon the IP packet.
8, device as claimed in claim 7 is characterized in that, the IP data envelope is dressed up the packet that has type identification and sequence number sign in described IP processing data packets unit.
9, device as claimed in claim 8, it is characterized in that, the described network equipment judges according to type identification and sequence number sign whether the IP packet that receives is correct, if correctly do not receive the IP packet of certain sequence number, then send the feedback message to the transmitting terminal network equipment, the type mark of described feedback message is for retransmitting, and sequence number is labeled as the IP packet of this sequence number; The transmitting terminal network equipment resends to the receiving terminal network equipment according to the IP packet of the feedback message of receiving with this sequence number in the buffering area; If the described transmitting terminal network equipment can't send the IP packet of this sequence number, then send message and inform the receiving terminal network equipment.
10, device as claimed in claim 7 is characterized in that, described IP processing data packets unit package IP packet is to increase special identifier between several Frames, escape is done in character identical with described special identifier in the Frame handle; It is to split into several Frames according to this special identifier that described IP processing data packets unit splits the IP packet, handles doing reduction through the character of escape in the Frame.
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| CNB2006100834742A CN100521654C (en) | 2006-05-30 | 2006-05-30 | Method for synchronous frame transmitting on IP network and network apparatus for transmission |
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| CNB2006100834742A CN100521654C (en) | 2006-05-30 | 2006-05-30 | Method for synchronous frame transmitting on IP network and network apparatus for transmission |
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