CN102684834A - Generic framing procedure (GFP) equipment and management information communication method thereof - Google Patents
Generic framing procedure (GFP) equipment and management information communication method thereof Download PDFInfo
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Abstract
The invention discloses generic framing procedure (GFP) equipment and a management information communication method thereof. The method comprises the following steps that: when required to send management information to opposite GFP equipment which is not connected with the GFP equipment, the GFP equipment periodically sends a first information frame to the opposite GFP equipment until a second information frame which is returned by the opposite GFP equipment and contains right response information is received, and then is successfully connected with the opposite GFP equipment; when required to send the management information to the opposite GFP equipment which is connected with the GFP equipment, the GFP equipment sends a third information frame which contains the management information to the opposite GFP equipment; and when receiving the first information frame or the third information frame which is received by the opposite GFP equipment, the GFP equipment correspondingly returns the second information frame which contains the right response information or wrong response information, wherein the first information frame, the second information frame and the third information frame are payloads of a GFP service management frame and respectively carry a first frame identifier, a second frame identifier and a third frame identifier.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of Generic Framing Procedure equipment and management information communication means thereof.
Background technology
G.7041 defined the notion of GFP (Generic Framing Procedure, Generic Framing Procedure) agreement in the standard at ITU-T.The GFP agreement is a kind of towards connectionless new types of data link layer packaging agreement; Can support the transmission of the present and the future's various data protocols flexibly; The end-to-end connection of simple economy is provided for ethernet frame; Have the expansion of packaging efficiency height, error code little, do not have at random characteristics such as bandwidth expansion cost, especially be fit to the application of high-speed transfer link.
The GFP traffic frame is divided into business data frame (GDFs) and service management frame (GMFs).The GFP business data frame is used for service data transmission, and GFP service management frame is used for transmitting with the service signal information relevant with the GFP connection management.G.7041 in the standard, less at ITU-T for the description of service management frame, just mentioned the usage that can be used for transmitting Client Signal Fail.Support that at present great majority are all only supported service data transmission in the communication products of GFP agreement, have only few portioned product to use GFP service management frame to transmit additional information.But these information are all very brief, for example the link-state information of several bytes or monitor message etc.This communication mode is too simple, and shortcoming is apparent in view, and the one, in present GFP equipment, certain restriction (for example 64 bytes) is all arranged for the length that transmits GFP service management frame.This communication mode just can not transmit overlength, a large amount of management information.The 2nd, because the reliable communication mechanism of neither one, so go wrong when transmission line, when causing the management information of transmission error code to occur, existing communication mode just can't guarantee the end-to-end management reliable information transmission.
In actual multiservice transport platform (MSTP) is used; Most equipment is all supported the GFP packaging technique; Complicated day by day and powerful along with communications device functions end to end uses GFP service management frame to transmit the trend that a large amount of tension management information becomes a certainty.How better to use GFP service management frame, make end to end between the GFP equipment, a large amount of management information of transmission that can convenient and reliable just becomes a urgent and real problem.
Summary of the invention
The technical problem that the present invention will solve is how the service management frame (GMF) through GFP transmits reliably a large amount of management information.
In order to address the above problem, the invention provides a kind of management information communication means of Generic Framing Procedure GFP equipment, comprising:
GFP equipment is in the time need sending management information to the GFP equipment of the opposite end that does not connect; Periodically send the GFP equipment that first information frame is given said opposite end; Up to the GFP equipment that receives this opposite end return contain second information frame of correct response message the time, confirm to be connected with the GFP equipment of this opposite end;
GFP equipment is when need when the GFP of the opposite end that has connected equipment sends management information, sending the GFP equipment that the 3rd information frame that contains said management information is given this opposite end;
GFP equipment when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, corresponding second information frame that contains correct or wrong responses information that returns;
Said first, second, third information frame is the payload of GFP service management frame, carries first, second, third frame identification respectively.
Further, the Senior Three bit representation in first byte of said first, second, third frame identification employing GFP service management frame payload, its numerical value is different.
Further, said response message adopts low six bit representations in the 3rd byte of GFP service management frame payload, and said response message comprises two kinds of correct response message and wrong responses information, uses different value representations respectively.
Further, said management information is carried in the 4th～n the byte in said the 3rd information frame; Wherein n is the byte number that payload comprised of GFP service management frame.
Further, GFP equipment after the GFP of opposite end equipment sends the first or the 3rd information frame, receive second information frame that the GFP equipment of this opposite end returns before, do not send other the first or the 3rd information frame to the GFP of this opposite end equipment.
Further, described method also comprises:
GFP equipment sends the 3rd information frame to behind the GFP equipment of opposite end; If receive second information frame that second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or the GFP equipment of not receiving this opposite end are in the given time returned, then resend the GFP equipment that last the 3rd information frame that sends is given this opposite end.
Further, also comprise before the said step that resends last the 3rd information frame that sends:
Whether the number of times of judging the 3rd information frame continuous retransmission surpasses predetermined threshold, if do not surpass with then the number of times of continuous retransmission is added 1, carries out the said step that resends the 3rd information frame of last transmission; Be not connected with the GFP equipment of said opposite end if surpassed then confirmed.
Further, said the 3rd information frame according to whether burst specifically is divided into four groups comprises: start frame, intermediate frame and end frame when single frames and multiframe transmission;
Represent four groups the 3rd information frame with four kind of the 3rd frame identification respectively;
The 3rd information frame that said transmission contains management information comprises for the step of the GFP equipment of opposite end:
The length of the management information of sending as required judges whether burst; If management information can use one the 3rd information frame to send, then the frame identification of the 3rd information frame is set to represent the 3rd frame identification of single frames, said management information is carried in the 3rd information frame sends;
If one the 3rd said management information of the not enough transmission of information frame then is carried at said management information in two or more the 3rd information frames and sends; And will carry the frame identification of the 3rd information frame of said management, according to the position of the 3rd information frame when sending said management information at place, relative set is the 3rd frame identification of expression start frame, intermediate frame or end frame.
Further, described method also comprises:
The frame identification of the 3rd information frame of receiving when GFP equipment is during for the 3rd frame identification of expression start frame; The management information that will begin from the 3rd information frame, carry to frame identification each the 3rd information frame till for the 3rd information frame of expression end frame is all carried out buffer memory, forms complete management information then.
Further, said first, second, third information frame also comprises:
Serial number; Serial number in said the first, the 3rd information frame is the sequence number that this information frame is distributed when sending for the first time; Serial number in second information frame is the serial number of the first or the 3rd information frame of being replied;
Low seven bit representations in second byte of said serial number employing GFP service management frame payload.
Further, said the first, the 3rd information frame also comprises:
Frame length; Said frame length is meant in this information frame except that frame identification, serial number, and the length of all the other fields adopts low six bit representations in the 3rd byte of GFP service management frame payload.
Further, said GFP equipment is when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, and the corresponding step of returning second information frame that contains correct or wrong responses information comprises:
If said GFP equipment receive incorrect the first, the 3rd information frame of type, or the first, the 3rd information frame received in serial number and desired value do not meet, then return second information frame that contains wrong responses information; In the time need not returning second information frame that contains wrong responses information, return second information frame that contains correct response message;
Said incorrect the first, the 3rd information frame of type of receiving is meant: the 3rd information frame of receiving first information frame that the GFP equipment of the opposite end that has been connected with this GFP equipment sends or the GFP equipment transmission of receiving the opposite end that is not connected with this GFP equipment;
Said desired value is meant that the serial number of the first or the 3rd information frame that type that this opposite end GFP equipment that the last time receives sent is correct adds 1.
The present invention also provides a kind of GFP equipment, comprising:
Data transmission module;
Connect initiation module; Be used in the time need sending management information to the GFP equipment of the opposite end that does not connect; Periodically send the GFP equipment that first information frame is given said opposite end; Up to the GFP equipment that receives this opposite end return contain second information frame of correct response message the time, confirm to be connected with the GFP equipment of this opposite end;
Said data transmission module is used for when need when the GFP of the opposite end that has connected equipment sends management information, sending the GFP equipment that the 3rd information frame that contains said management information is given this opposite end;
Responder module during the first or the 3rd information frame that is used for sending when the GFP equipment of receiving the opposite end, returns second information frame that contains correct or wrong responses information;
Said first, second, third information frame is the payload of GFP service management frame, carries first, second, third frame identification respectively.
Further, the Senior Three bit representation in first byte of said first, second, third frame identification employing GFP service management frame payload, its numerical value is different.
Further, said response message adopts low six bit representations in the 3rd byte of GFP service management frame payload, and said response message comprises two kinds of correct response message and wrong responses information, uses different value representations respectively.
Further, said management information is carried in the 4th～n the byte in said the 3rd information frame; Wherein n is the byte number that payload comprised of GFP service management frame.
Further, said connection initiation module/data transmission module after the GFP of pair of end equipment sends first/the 3rd information frame, receive second information frame that the GFP equipment of this opposite end returns before, do not send any information frame to the GFP of this opposite end equipment.
Further; Said data transmission module also is used for sending the 3rd information frame to behind the GFP equipment of opposite end; If receive second information frame that second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or the GFP equipment of not receiving this opposite end are in the given time returned, then resend the GFP equipment that last the 3rd information frame that sends is given this opposite end.
Further; Before the 3rd information frame that said data transmission module also is used on resending, once sending; Whether the number of times of judging earlier the 3rd information frame continuous retransmission surpasses predetermined threshold; If do not surpass then the number of times of continuous retransmission is added 1, the New Development of laying equal stress on is served the step of the 3rd information frame that once sends; If surpassed then notify the GFP equipment of said connection initiation module and said opposite end not to be connected.
Further, said the 3rd information frame according to whether burst specifically is divided into four groups comprises: start frame, intermediate frame and end frame when single frames and multiframe transmission;
Represent four groups the 3rd information frame with four kind of the 3rd frame identification respectively;
Said data transmission module sends the 3rd information frame that contains said management information and is meant for the GFP equipment of this opposite end:
The length of the management information that said data transmission module sends as required judges whether burst; If management information can use one the 3rd information frame to send, the frame identification of then said data transmission module the 3rd information frame is set to represent the 3rd frame identification of single frames, said management information is carried in the 3rd information frame sends;
If one the 3rd said management information of the not enough transmission of information frame, then said data transmission module is carried at said management information in two or more the 3rd information frames and sends; And will carry the frame identification of the 3rd information frame of said management, according to the position of the 3rd information frame when sending said management information at place, relative set is the 3rd frame identification of expression start frame, intermediate frame or end frame.
Further, described equipment also comprises:
Assembling module; The frame identification of the 3rd information frame that is used for receiving when said responder module is during for the 3rd frame identification of expression start frame; The management information that will begin from the 3rd information frame, carry to frame identification each the 3rd information frame till for the 3rd information frame of expression end frame is all carried out buffer memory, forms complete management information then.
Further, said first, second, third information frame also comprises:
Serial number; Serial number in said the first, the 3rd information frame is the sequence number that this information frame is distributed when sending for the first time; Serial number in second information frame is the serial number of the first or the 3rd information frame of being replied;
Low seven bit representations in second byte of said serial number employing GFP service management frame payload.
Further, said the first, the 3rd information frame also comprises:
Frame length; Said frame length is meant in this information frame except that frame identification, serial number, and the length of all the other fields adopts low six bit representations in the 3rd byte of GFP service management frame payload.
Further, said responder module is when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, and corresponding second information frame that contains correct or wrong responses information that returns is meant:
If said responder module receive incorrect the first, the 3rd information frame of type, or the first, the 3rd information frame received in serial number and desired value do not meet, then return second information frame that contains wrong responses information; In the time need not returning second information frame that contains wrong responses information, then return second information frame that contains correct response message;
Said incorrect the first, the 3rd information frame of type of receiving is meant: the 3rd information frame of receiving first information frame that the GFP equipment of the opposite end that has been connected with this GFP equipment sends or the GFP equipment transmission of receiving the opposite end that is not connected with this GFP equipment;
Said desired value is meant that the serial number of the first or the 3rd information frame that type that this opposite end GFP equipment that the last time receives sent is correct adds 1.
Technical scheme of the present invention has overcome the current defective that can only use GFP service management frame to transmit brief management information; Solved the problem that current use GFP service management frame can't carry out end-to-end reliable transmission; Can support the transmission of a large amount of management information through the service management frame (GMF) of GFP; Can guarantee the reliability that management information transmits, realize the reliable communication of a large amount of management information end to end; The present invention is that prioritization scheme is supported burst and retransmission mechanism, has realized supporting the transmission of overlength message, and the upper strata need not to be concerned about how to send reliably, only need issue the management information that will transmit, so use also very convenient.
Description of drawings
Fig. 1 is the migration situation sketch map of source end between each state in the example of embodiment one;
Fig. 2 is the transition process sketch map of source end between each state in the example of embodiment one;
Fig. 3 is the schematic block diagram of the GFP equipment of embodiment two.
Embodiment
To combine accompanying drawing and embodiment that technical scheme of the present invention is explained in more detail below.
Need to prove that if do not conflict, each characteristic among the embodiment of the invention and the embodiment can mutually combine, all within protection scope of the present invention.
The management information communication means of embodiment one, a kind of GFP equipment comprises:
GFP equipment is in the time need sending management information to the GFP equipment of the opposite end that does not connect; Periodically send the GFP equipment that first information frame is given said opposite end; Up to the GFP equipment that receives this opposite end return contain second information frame of correct response message the time, confirm to be connected with the GFP equipment of this opposite end;
GFP equipment is when need when the GFP of the opposite end that has connected equipment sends management information, sending the GFP equipment that the 3rd information frame that contains said management information is given this opposite end;
GFP equipment when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, corresponding second information frame that contains correct or wrong responses information that returns;
Said first, second, third information frame is the payload of GFP service management frame, carries first, second, third frame identification respectively.
Whether in the present embodiment, three types information frame is arranged, said first information frame can be described as contact frame, can be used for agreement identification, can proper communication to confirm two ends; Said second information frame can be described as acknowledgement frame; Said the 3rd information frame can be described as Frame, can also comprise according to whether burst specifically is divided into four groups: start frame, intermediate frame and end frame when single frames and multiframe transmission.
In the present embodiment, when GFP equipment send first information frame and receive that the GFP equipment of opposite end sends contain second information frame of correct response message the time, just show and the GFP equipment of opposite end between set up connection, can send management information; Use the 3rd information frame to send when sending management information; In a communication process, the GFP equipment (initiating an end of communication) that sends the first, the 3rd information frame is called the source end, and (end of responding communication) that return second information frame is called Su Duan.
Source end and Su Duan are notions in logic, an end of practical communication can be the source end be again Su Duan, the other end of communication then can correspond to be the place end be again the source end.
For the two ends of communication, four the basic actions of can be abstract coming out comprise:
(1) sends Frame or contact frame to the opposite end;
(2) receive reply (frame) that send the opposite end to Frame or contact frame;
(3) receive opposite end data sent frame or contact frame;
(4) transmission is to reply (frame) of this Frame or contact frame;
From saying in logic, the action of (1), (2) is separate with the action of (3), (4), calls the source end to an end of carrying out (1) and (2) operation here, and an end of carrying out (3) (4) is called Su Duan.
In the present embodiment, said first, second, third frame identification can but be not limited to adopt the Senior Three position (bit7-5) in information frame first byte of (comprising first, second, third information frame, the payload of the frame of GFP service management just) to represent; Its numerical value is different; Can represent four groups the 3rd information frame with four kind of the 3rd frame identification respectively.
In a kind of concrete implementation, each frame identification can but be not limited to the regulation as follows:
000:start, the start frame the during transmission of Frame multiframe;
001:mid, the intermediate frame the during transmission of Frame multiframe;
010:sigle, the transmission of Frame single frames;
011:end, the end frame the during transmission of Frame multiframe;
100:ack, the acknowledgement frame of all frames;
111:contact, contact frame is used for agreement identification.
In the present embodiment, low five (bit4～bit0) can be used as cookie, the persistent data of maintenance when being used for the opposite end and communicating by letter in first byte of information frame with local terminal.By the user transmission value is provided.
In the present embodiment, said first, second, third information frame can also comprise: serial number; Serial number in said the first, the 3rd information frame is the sequence number that this information frame is distributed when sending for the first time; The first, the 3rd information frame can be counted together; This serial number just should increase progressively when not retransmitting; Just adopt sequence number when sending this information frame for the first time as serial number when retransmitting the first or the 3rd information frame, the serial number when promptly keeping this information frame and sending for the first time; Serial number in second information frame is the serial number of the first or the 3rd information frame of being replied, such as receiving that will return the second information frame B behind first/the 3rd information frame A time, the serial number of this second information frame B is exactly the serial number of information frame A.Said serial number can but be not limited to adopt low seven (bit6～0) expression in second byte of said information frame, first (bit7) in second byte can keep.
In the present embodiment, said response message can but be not limited to adopt low six (bit5～0) expression in the 3rd byte of said information frame, only have second information frame to contain response message; Said response message comprises two kinds of correct response message and wrong responses information, uses different value representations respectively; In a kind of concrete implementation, said response message can but be not limited to the regulation as follows:
0x15: expression OK (being correct response message);
0x2A: expression ERROR (being wrong responses information).
In the present embodiment, said method can also comprise:
GFP equipment sends the 3rd information frame to behind the GFP equipment of opposite end; If receive second information frame that second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or the GFP equipment of not receiving this opposite end are in the given time returned, then resend the GFP equipment that last the 3rd information frame that sends is given this opposite end.
Obviously, GFP equipment also carries out top step after resending the 3rd information frame.
In the present embodiment, GFP equipment was periodically to send first information frame before second information frame that contains correct response message that the GFP equipment of receiving the opposite end returns, this also be appreciated that into:
GFP equipment sends first information frame to behind the GFP equipment of opposite end; If receive second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or (length can be the time span in " periodically sending " lining cycle at the fixed time; The length of " scheduled time " when judging whether in the preceding text to retransmit the 3rd information frame can equate or not wait) in do not receive second information frame that the GFP equipment of this opposite end returns, then resend the GFP equipment that the last first information frame that sends is given this opposite end.
In the present embodiment, GFP equipment after the GFP of pair of end equipment sends the first or the 3rd information frame, receive second information frame that the GFP equipment of this opposite end returns before, do not send other the first or the 3rd information frame to the GFP of this opposite end equipment; If but receive that the first or the 3rd information frame that opposite end GFP equipment sends still equally can send second information frame; Also can send the first or the 3rd information frame to the GFP of other opposite end equipment.
In the present embodiment, can also comprise before the said step that resends last the 3rd information frame that sends:
Whether the number of times of judging the 3rd information frame continuous retransmission surpasses predetermined threshold, if do not surpass with then the number of times of continuous retransmission is added 1, carries out the said step that resends the 3rd information frame of last transmission; Be not connected with the GFP equipment of said opposite end if surpassed then confirmed.
The above-mentioned scheduled time and predetermined threshold can rule of thumb be worth or setting such as theoretical value, and the scheduled time picks up counting after sending, the number of times of continuous retransmission counting when an information frame is retransmitted for the first time.
In the present embodiment, the 3rd information frame that said transmission contains said management information specifically can comprise for the step of the GFP equipment of this opposite end:
The length of the management information of sending as required judges whether burst; If management information can use one the 3rd information frame to send, then the frame identification of the 3rd information frame is set to represent the 3rd frame identification of single frames, said management information is carried in the 3rd information frame sends;
If one the 3rd said management information of the not enough transmission of information frame then is carried at said management information in two or more the 3rd information frames and sends; And will carry the frame identification of the 3rd information frame of said management, according to the position of the 3rd information frame when sending said management information at place, relative set is the 3rd frame identification of expression start frame, intermediate frame or end frame.
In the present embodiment, said method can also comprise:
The frame identification of the 3rd information frame of receiving when GFP equipment is during for the 3rd frame identification of expression start frame; The management information that will begin from the 3rd information frame, carry to frame identification each the 3rd information frame till for the 3rd information frame of expression end frame is all carried out buffer memory, forms complete management information then.
In the present embodiment, said GFP equipment is when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, and the corresponding step of returning second information frame that contains correct or wrong responses information specifically can comprise:
If said GFP equipment receive incorrect the first, the 3rd information frame of type, or the first, the 3rd information frame received in serial number and desired value do not meet, then return second information frame that contains wrong responses information; In the time need not returning second information frame that contains wrong responses information, then return second information frame that contains correct response message;
Said incorrect the first, the 3rd information frame of type of receiving is meant: the 3rd information frame of receiving first information frame that the GFP equipment of the opposite end that has been connected with this GFP equipment sends or the GFP equipment transmission of receiving the opposite end that is not connected with this GFP equipment; Said desired value is meant that the serial number of the first or the 3rd information frame that type that this opposite end GFP equipment that the last time receives sent is correct adds 1.
During practical application, the reason that can cause sending second information frame that contains wrong responses information can be not limited to above description, can also comprise other reason.
In the present embodiment, said the first, the 3rd information frame can also comprise: frame length; The frame length scope that said frame length is represented is 0～55 bit; Be meant in this information frame except that frame identification, serial number; The length of all the other fields; Can but be not limited to adopt low six (bit5～0) expression in the 3rd byte of said information frame, just with second information frame in response message use the bit of same position, high two (bit7～6) in the 3rd byte can keep.
In the present embodiment, said management information is carried in the 4th～n the byte in said the 3rd information frame, that is to say the 4th data field that byte is an information frame to n byte, needs the management information on the upper strata of transmission just to be stored in this data field; Wherein n is the length (byte number) of payload in the GFP service management frame supported of concrete GFP business chip.
In the present embodiment, said information frame can also comprise n+1 byte, as check field, can accomplish the verification for information frame through this field.In actual use, because GFP service management frame has been supported the FCS verifying function, so this field can not used.
When check field, if the check field mistake in the first or the 3rd information frame that GFP equipment is received is then also returned second information frame that contains wrong responses information.
In the object lesson of present embodiment, the form of information frame and definition thereof can be shown in tables one.
Table one, information frame formal definition table
In this example, can the operate condition of source end be defined as in the communication process of following several kinds and Su Duan, the migration situation of source end between each state is as shown in Figure 1, and process is as shown in Figure 2:
(1) NULL (contact) state
Equipment is in this state when beginning most (START), expression source end does not also have in the contact of chummage end, and can not send Frame this moment, but can send contact frame, whenever just sends contact frame one time at a distance from some cycles; Each send contact frame after, the source end WAIT state of moving into.
(2) WAIT (wait acknowledge) state
Expression Frame or contact frame have sent and have finished, and are in the state of waiting for that Su Duan replys, during this state, can not send other Frames.If received the acknowledgement frame that contains correct response message in the given time, then enter into the READY state.
If contact frame sends and to finish and wait for that the replying of contact frame (frame) is overtime or received the acknowledgement frame that contains wrong responses information, then move back to the NULL state.
Finish if Frame sends, when then being in this state, need carry out time-out count.If (same Frame is overtime to be added up with number of times wrong responses (frame) the overtime number of times of replying of wait Frame with the number of times of having received the acknowledgement frame that contains wrong responses information; The number of times that also just is equivalent to this Frame continuous retransmission) surpasses predetermined threshold; Then move back to the NULL state (can be judge at the WAIT state ultra inferior and move back to the NULL state; Also can be after getting into the RETRY state, before repeating transmission, to judge whether ultra inferiorly and move back to the NULL state, be in the judgement of RETRY state shown in Fig. 2).If Frame reply overtime or wrong responses (promptly having received the acknowledgement frame that contains wrong responses information), and this Frame is overtime and the number of times of wrong responses (number of times that is equivalent to this Frame continuous retransmission) surpasses predetermined threshold, then gets into the RETRY state.
(3) RETRY (retry) state
After Frame has been sent in expression, receive Su Duan the acknowledgement frame mistake (such as overtime, serial number not to or check field mistake etc.), perhaps Su Duan replys and representes that the information frame that receives is wrong (promptly receiving the acknowledgement frame that contains wrong responses information).At this moment, enter into the RETRY state.When this state, generally can resend the Frame that sent last time, send the back state that finishes and just change the WAIT state once more into; This moment, the number of times of RETRY can add up; Surpass predetermined threshold (be among Fig. 1 data frame re-transmission ultra inferior) if before repeating transmission, find the number of times of continuous retransmission of a Frame of accumulative total; Then state is moved back to the NULL state; Can also notify the upper strata this moment, communication loss, and just original connection of setting up has not become connection.
(4) READY (being ready for sending) state
Expression source end this moment and Su Duan get in touch with, and have set up connection, are in the state that is ready for sending Frame.Meeting this moment determines whether burst according to the length of the management information data of upper strata needs transmission.If a Frame just can send; Then the frame identification territory of this Frame will be changed to 0b ' 010; Burst if desired, then according to being first burst, middle burst or last burst, the frame identification territory of Frame is changed to 0b ' 000,0b ' 001 and 0b ' 011.Frame sends the back that finishes and gets into the WAIT state, waits for replying of Su Duan.
The worker state machine of Su Duan is simpler, just requires to reply for contact frame that receives or Frame.Generally comprise two kinds of operations: one for sending acknowledgement frame to the source end, and the expression local terminal has received contact frame or Frame.And whether correctly to fill Acknowledge according to the contact frame that receives or Frame be 0x15 or 0x2a.Two for packaging according to the Frame that receives.When the Frame that receives is multi-disc, need opens up buffering and be used for the group bag.When the Frame that receives can be formed complete message, the place end generally also need be submitted to the upper strata to message and handle.
Fig. 2 is the transmission handling process of an end in the end-to-end communication in this example:
In the end-to-end communication of reality, as communication an end, be the source end be again Su Duan, this moment processing than pure source end and Su Duan communicate by letter the complicacy.In addition, when the end-to-end communication of reality, also need consider more situation.Can have following treatment principle this moment:
(1) operating state of an end of communication can be identical with the source end, is divided into NULL, WAIT, RETRY and four kinds of states of READY, but no matter under which kind of state, can send acknowledgement frame, sends the operating state that acknowledgement frame should not have influence on local terminal;
When (2) sending,, then preferentially send acknowledgement frame if need send Frame and acknowledgement frame simultaneously;
(3) when transfiniting owing to expired times at the RETRY state, when moving back to the NULL state, can notify the upper strata usually, two ends of expression communication have lost connection;
(4) also need consider the frequency that information frame sends during practical application, can not be too frequent, otherwise can have influence on the professional transmission of GFP.
Embodiment two, a kind of GFP equipment, as shown in Figure 3, comprising: data transmission module;
Connect initiation module; Be used in the time need sending management information to the GFP equipment of the opposite end that does not connect; Periodically send the GFP equipment that first information frame is given said opposite end; Up to the GFP equipment that receives this opposite end return contain second information frame of correct response message the time, confirm to be connected with the GFP equipment of this opposite end;
Said data transmission module is used for when need when the GFP of the opposite end that has connected equipment sends management information, sending the GFP equipment that the 3rd information frame that contains said management information is given this opposite end;
Responder module during the first or the 3rd information frame that is used for sending when the GFP equipment of receiving the opposite end, returns second information frame that contains correct or wrong responses information;
Said first, second, third information frame is the payload of GFP service management frame, carries first, second, third frame identification respectively.
Can but the GFP equipment mark of the opposite end that is not limited to have connected with a file or table storage is not the GFP equipment of the opposite end that do not connect in this document or form.
Whether in the present embodiment, comprise the information frame of three types: said first information frame can be described as contact frame, can be used for agreement identification, can proper communication to confirm two ends; Said second information frame can be described as acknowledgement frame; Said the 3rd information frame can be described as Frame, can also comprise according to whether burst specifically is divided into four groups: start frame, intermediate frame and end frame when single frames and multiframe transmission.
In the present embodiment, said first, second, third frame identification can but be not limited to adopt the Senior Three position (bit7-5) in information frame first byte of (comprising first, second, third information frame, the payload of the frame of GFP service management just) to represent; Its numerical value is different; Can represent four groups the 3rd information frame with four kind of the 3rd frame identification respectively.
In the present embodiment, said first, second, third information frame can also comprise: serial number; Serial number in said the first, the 3rd information frame is the sequence number that this information frame is distributed when sending for the first time; Serial number in second information frame is the serial number of the first or the 3rd information frame of being replied.Said serial number can but be not limited to adopt low seven (bit6～0) expression in second byte of said information frame, first (bit7) in second byte can keep.
In the present embodiment, said response message can but be not limited to adopt low six (bit5～0) expression in the 3rd byte of said information frame, only have second information frame to contain response message; Said response message comprises correct and wrong two kinds, uses different value representations respectively.
In the present embodiment; Said data transmission module can also be used for sending the 3rd information frame to behind the GFP equipment of opposite end; If receive second information frame that second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or the GFP equipment of not receiving this opposite end are in the given time returned, then resend the GFP equipment that last the 3rd information frame that sends is given this opposite end.
In the present embodiment, said connection initiation module was periodically to send first information frame before second information frame that contains correct response message that the GFP equipment of receiving the opposite end returns, this also be appreciated that into:
Said connection initiation module sends first information frame to behind the GFP equipment of opposite end; If receive second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or (length can be the time span in " periodically sending " lining cycle at the fixed time; The length of " scheduled time " when judging whether in the preceding text to retransmit the 3rd information frame can equate or not wait) in do not receive second information frame that the GFP equipment of this opposite end returns, then resend the GFP equipment that the last first information frame that sends is given this opposite end.
In the present embodiment; Said connection initiation module/data transmission module after the GFP of pair of end equipment sends first/the 3rd information frame, receive second information frame that the GFP equipment of this opposite end returns before; Do not send any information frame to the GFP of this opposite end equipment, if but receive that the first or the 3rd information frame responder module that opposite end GFP equipment sends still equally can send second information frame; Said connection initiation module/data transmission module also can send the first or the 3rd information frame to the GFP of other opposite end equipment.
In the present embodiment; Before the 3rd information frame that said data transmission module can also be used on resending, once sending; Whether the number of times of judging earlier the 3rd information frame continuous retransmission surpasses predetermined threshold; If do not surpass then the number of times of continuous retransmission is added 1, the New Development of laying equal stress on is served the step of the 3rd information frame that once sends; If surpassed then notify the GFP equipment of said connection initiation module and said opposite end not to be connected.
The above-mentioned scheduled time and predetermined threshold can rule of thumb be worth or setting such as theoretical value, and the scheduled time picks up counting after sending, the number of times of continuous retransmission counting when an information frame is retransmitted for the first time.
In the present embodiment, said data transmission module sends the 3rd information frame that contains said management information and specifically can be meant for the GFP equipment of this opposite end:
The length of the management information that said data transmission module sends as required judges whether burst; If management information can use one the 3rd information frame to send, the frame identification of then said data transmission module the 3rd information frame is set to represent the 3rd frame identification of single frames, said management information is carried in the 3rd information frame sends;
If one the 3rd said management information of the not enough transmission of information frame, then said data transmission module is carried at said management information in two or more the 3rd information frames and sends; And will carry the frame identification of the 3rd information frame of said management, according to the position of the 3rd information frame when sending said management information at place, relative set is the 3rd frame identification of expression start frame, intermediate frame or end frame.
In the present embodiment, said GFP equipment can also comprise:
Assembling module; The frame identification of the 3rd information frame that is used for receiving when said responder module is during for the 3rd frame identification of expression start frame; The management information that will begin from the 3rd information frame, carry to frame identification each the 3rd information frame till for the 3rd information frame of expression end frame is all carried out buffer memory, forms complete management information then.
In the present embodiment, said responder module is when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, and corresponding second information frame that contains correct or wrong responses information that returns specifically can be meant:
If said responder module receive incorrect the first, the 3rd information frame of type, or the first, the 3rd information frame received in serial number and desired value do not meet, then return second information frame that contains wrong responses information; In the time need not returning second information frame that contains wrong responses information, then return second information frame that contains correct response message;
Said incorrect the first, the 3rd information frame of type of receiving is meant: the 3rd information frame of receiving first information frame that the GFP equipment of the opposite end that has been connected with this GFP equipment sends or the GFP equipment transmission of receiving the opposite end that is not connected with this GFP equipment; Said desired value is meant that the serial number of the first or the 3rd information frame that type that this opposite end GFP equipment that the last time receives sent is correct adds 1.Can but the GFP equipment mark of the opposite end that is not limited to also to be connected with this GFP equipment with a file or table storage is not the GFP equipment of the opposite end that is not connected with this GFP equipment in this document or form.
During practical application, the reason that can cause sending second information frame that contains wrong responses information can be not limited to above description, can also comprise other reason.
In the present embodiment, said the first, the 3rd information frame can also comprise: frame length; The frame length scope that said frame length is represented is 0～55 bit; Be meant in this information frame except that frame identification, serial number; The length of all the other fields; Can but be not limited to adopt low six (bit5～0) expression in the 3rd byte of said information frame, just with second information frame in response message use the bit of same position, high two (bit7～6) in the 3rd byte can keep.
In the present embodiment, said management information is carried in the 4th～n the byte in said the 3rd information frame, that is to say the 4th data field that byte is an information frame to n byte, needs the management information on the upper strata of transmission just to be stored in this data field; Wherein n is the length (byte number) of payload in the GFP service management frame supported of concrete GFP business chip.
In the present embodiment, said information frame can also comprise n+1 byte, as check field, can accomplish the verification for information frame through this field.In actual use, because GFP service management frame has been supported the FCS verifying function, so this field can not used.
When check field, if the check field mistake in the first or the 3rd information frame that responder module is received is then also returned second information frame that contains wrong responses information.
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 claim of the present invention.
Claims (24)
1. the management information communication means of a Generic Framing Procedure GFP equipment comprises:
GFP equipment is in the time need sending management information to the GFP equipment of the opposite end that does not connect; Periodically send the GFP equipment that first information frame is given said opposite end; Up to the GFP equipment that receives this opposite end return contain second information frame of correct response message the time, confirm to be connected with the GFP equipment of this opposite end;
GFP equipment is when need when the GFP of the opposite end that has connected equipment sends management information, sending the GFP equipment that the 3rd information frame that contains said management information is given this opposite end;
GFP equipment when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, corresponding second information frame that contains correct or wrong responses information that returns;
Said first, second, third information frame is the payload of GFP service management frame, carries first, second, third frame identification respectively.
2. the method for claim 1 is characterized in that:
Senior Three bit representation in first byte of said first, second, third frame identification employing GFP service management frame payload, its numerical value is different.
3. the method for claim 1 is characterized in that:
Said response message adopts low six bit representations in the 3rd byte of GFP service management frame payload, and said response message comprises two kinds of correct response message and wrong responses information, uses different value representations respectively.
4. the method for claim 1 is characterized in that:
Said management information is carried in the 4th～n the byte in said the 3rd information frame; Wherein n is the byte number that payload comprised of GFP service management frame.
5. the method for claim 1 is characterized in that:
GFP equipment after the GFP of opposite end equipment sends the first or the 3rd information frame, receive second information frame that the GFP equipment of this opposite end returns before, do not send other the first or the 3rd information frame to the GFP of this opposite end equipment.
6. the method for claim 1 is characterized in that, also comprises:
GFP equipment sends the 3rd information frame to behind the GFP equipment of opposite end; If receive second information frame that second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or the GFP equipment of not receiving this opposite end are in the given time returned, then resend the GFP equipment that last the 3rd information frame that sends is given this opposite end.
7. method as claimed in claim 6 is characterized in that, also comprises before the said step that resends last the 3rd information frame that sends:
Whether the number of times of judging the 3rd information frame continuous retransmission surpasses predetermined threshold, if do not surpass with then the number of times of continuous retransmission is added 1, carries out the said step that resends the 3rd information frame of last transmission; Be not connected with the GFP equipment of said opposite end if surpassed then confirmed.
8. the method for claim 1 is characterized in that:
Said the 3rd information frame according to whether burst specifically is divided into four groups comprises: start frame, intermediate frame and end frame when single frames and multiframe transmission;
Represent four groups the 3rd information frame with four kind of the 3rd frame identification respectively;
The 3rd information frame that said transmission contains management information comprises for the step of the GFP equipment of opposite end:
The length of the management information of sending as required judges whether burst; If management information can use one the 3rd information frame to send, then the frame identification of the 3rd information frame is set to represent the 3rd frame identification of single frames, said management information is carried in the 3rd information frame sends;
If one the 3rd said management information of the not enough transmission of information frame then is carried at said management information in two or more the 3rd information frames and sends; And will carry the frame identification of the 3rd information frame of said management, according to the position of the 3rd information frame when sending said management information at place, relative set is the 3rd frame identification of expression start frame, intermediate frame or end frame.
9. method as claimed in claim 8 is characterized in that, also comprises:
The frame identification of the 3rd information frame of receiving when GFP equipment is during for the 3rd frame identification of expression start frame; The management information that will begin from the 3rd information frame, carry to frame identification each the 3rd information frame till for the 3rd information frame of expression end frame is all carried out buffer memory, forms complete management information then.
10. like each described method in the claim 1 to 9, it is characterized in that said first, second, third information frame also comprises:
Serial number; Serial number in said the first, the 3rd information frame is the sequence number that this information frame is distributed when sending for the first time; Serial number in second information frame is the serial number of the first or the 3rd information frame of being replied;
Low seven bit representations in second byte of said serial number employing GFP service management frame payload.
11. method as claimed in claim 10 is characterized in that, said the first, the 3rd information frame also comprises:
Frame length; Said frame length is meant in this information frame except that frame identification, serial number, and the length of all the other fields adopts low six bit representations in the 3rd byte of GFP service management frame payload.
12. method as claimed in claim 10 is characterized in that, said GFP equipment is when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, and the corresponding step of returning second information frame that contains correct or wrong responses information comprises:
If said GFP equipment receive incorrect the first, the 3rd information frame of type, or the first, the 3rd information frame received in serial number and desired value do not meet, then return second information frame that contains wrong responses information; In the time need not returning second information frame that contains wrong responses information, return second information frame that contains correct response message;
Said incorrect the first, the 3rd information frame of type of receiving is meant: the 3rd information frame of receiving first information frame that the GFP equipment of the opposite end that has been connected with this GFP equipment sends or the GFP equipment transmission of receiving the opposite end that is not connected with this GFP equipment;
Said desired value is meant that the serial number of the first or the 3rd information frame that type that this opposite end GFP equipment that the last time receives sent is correct adds 1.
13. a GFP equipment is characterized in that, comprising:
Data transmission module;
Connect initiation module; Be used in the time need sending management information to the GFP equipment of the opposite end that does not connect; Periodically send the GFP equipment that first information frame is given said opposite end; Up to the GFP equipment that receives this opposite end return contain second information frame of correct response message the time, confirm to be connected with the GFP equipment of this opposite end;
Said data transmission module is used for when need when the GFP of the opposite end that has connected equipment sends management information, sending the GFP equipment that the 3rd information frame that contains said management information is given this opposite end;
Responder module during the first or the 3rd information frame that is used for sending when the GFP equipment of receiving the opposite end, returns second information frame that contains correct or wrong responses information;
Said first, second, third information frame is the payload of GFP service management frame, carries first, second, third frame identification respectively.
14. equipment as claimed in claim 13 is characterized in that:
Senior Three bit representation in first byte of said first, second, third frame identification employing GFP service management frame payload, its numerical value is different.
15. equipment as claimed in claim 13 is characterized in that:
Said response message adopts low six bit representations in the 3rd byte of GFP service management frame payload, and said response message comprises two kinds of correct response message and wrong responses information, uses different value representations respectively.
16. equipment as claimed in claim 13 is characterized in that:
Said management information is carried in the 4th～n the byte in said the 3rd information frame; Wherein n is the byte number that payload comprised of GFP service management frame.
17. equipment as claimed in claim 13 is characterized in that:
Said connection initiation module/data transmission module after the GFP of pair of end equipment sends first/the 3rd information frame, receive second information frame that the GFP equipment of this opposite end returns before, do not send any information frame to the GFP of this opposite end equipment.
18. equipment as claimed in claim 13 is characterized in that:
Said data transmission module also is used for sending the 3rd information frame to behind the GFP equipment of opposite end; If receive second information frame that second information frame that contains wrong responses information that the GFP equipment of this opposite end returns or the GFP equipment of not receiving this opposite end are in the given time returned, then resend the GFP equipment that last the 3rd information frame that sends is given this opposite end.
19. equipment as claimed in claim 18 is characterized in that:
Before the 3rd information frame that said data transmission module also is used on resending, once sending; Whether the number of times of judging earlier the 3rd information frame continuous retransmission surpasses predetermined threshold; If do not surpass then the number of times of continuous retransmission is added 1, the New Development of laying equal stress on is served the step of the 3rd information frame that once sends; If surpassed then notify the GFP equipment of said connection initiation module and said opposite end not to be connected.
20. equipment as claimed in claim 13 is characterized in that:
Said the 3rd information frame according to whether burst specifically is divided into four groups comprises: start frame, intermediate frame and end frame when single frames and multiframe transmission;
Represent four groups the 3rd information frame with four kind of the 3rd frame identification respectively;
Said data transmission module sends the 3rd information frame that contains said management information and is meant for the GFP equipment of this opposite end:
The length of the management information that said data transmission module sends as required judges whether burst; If management information can use one the 3rd information frame to send, the frame identification of then said data transmission module the 3rd information frame is set to represent the 3rd frame identification of single frames, said management information is carried in the 3rd information frame sends;
If one the 3rd said management information of the not enough transmission of information frame, then said data transmission module is carried at said management information in two or more the 3rd information frames and sends; And will carry the frame identification of the 3rd information frame of said management, according to the position of the 3rd information frame when sending said management information at place, relative set is the 3rd frame identification of expression start frame, intermediate frame or end frame.
21. equipment as claimed in claim 20 is characterized in that, also comprises:
Assembling module; The frame identification of the 3rd information frame that is used for receiving when said responder module is during for the 3rd frame identification of expression start frame; The management information that will begin from the 3rd information frame, carry to frame identification each the 3rd information frame till for the 3rd information frame of expression end frame is all carried out buffer memory, forms complete management information then.
22., it is characterized in that said first, second, third information frame also comprises like each described equipment in the claim 13 to 21:
Serial number; Serial number in said the first, the 3rd information frame is the sequence number that this information frame is distributed when sending for the first time; Serial number in second information frame is the serial number of the first or the 3rd information frame of being replied;
Low seven bit representations in second byte of said serial number employing GFP service management frame payload.
23. equipment as claimed in claim 22 is characterized in that, said the first, the 3rd information frame also comprises:
Frame length; Said frame length is meant in this information frame except that frame identification, serial number, and the length of all the other fields adopts low six bit representations in the 3rd byte of GFP service management frame payload.
24. equipment as claimed in claim 22 is characterized in that, said responder module is when the first or the 3rd information frame that the GFP equipment of receiving the opposite end sends, and corresponding second information frame that contains correct or wrong responses information that returns is meant:
If said responder module receive incorrect the first, the 3rd information frame of type, or the first, the 3rd information frame received in serial number and desired value do not meet, then return second information frame that contains wrong responses information; In the time need not returning second information frame that contains wrong responses information, then return second information frame that contains correct response message;
Said incorrect the first, the 3rd information frame of type of receiving is meant: the 3rd information frame of receiving first information frame that the GFP equipment of the opposite end that has been connected with this GFP equipment sends or the GFP equipment transmission of receiving the opposite end that is not connected with this GFP equipment;
Said desired value is meant that the serial number of the first or the 3rd information frame that type that this opposite end GFP equipment that the last time receives sent is correct adds 1.
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| CN113115266A (en) * | 2021-04-15 | 2021-07-13 | 中车青岛四方机车车辆股份有限公司 | Method for improving real-time performance of rail transit signal system communication |
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| WO2005055504A1 (en) * | 2003-11-25 | 2005-06-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Power-based rate adaptation of wireless communication channels |
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