CN102843265B - Not resetting without the hot standby dual link method of perturbation of a kind of communication protocol - Google Patents
Not resetting without the hot standby dual link method of perturbation of a kind of communication protocol Download PDFInfo
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Abstract
The invention discloses a kind of be applicable to the modern complicated supervisory control system communication protocol of track traffic do not reset without the hot standby dual link method of perturbation, by two independently communication channel respectively set up an effective communication and connect, article two, communication connection realizes only having a communication to connect for transmitting data by State Transferring, another communication connection maintains the effective of connection by sending heartbeat message mode, hot standby each other; When system communication equipment fault, carry out connection and switch.By the operation isolation by communication data and communication data, set rational transaction types and operating process, and by carrying data mode mark in communication, fail before only retransmitting switching after making to connect switching the data transmitted, thus realize when not resetting still effective guarantee without perturbation, improve communication efficiency.Ensure the timely transmission of data, and be applicable to the situation of unstable networks.
Description
Technical field
This technological invention relates to track traffic automatic field, particularly relates to distributed monitoring system field, and this technological invention can be widely used in electric railway and the application such as each professional supervisory control system of urban track traffic and comprehensive monitoring system.
Background technology
Along with developing rapidly of computer science and automatic technology, in the every field of track traffic, the such as field such as electric railway and city underground, supervisory control system is from traditional small table system to the distributed complex System Development in modern times, its territorial scope controlled, flow process scale etc. all increases sharply.And due to tradition adopt discrete supervisory control system pattern, namely there is signal, PSCADA(power monitoring), the control of BAS(ring) etc. multiple independently supervisory control system respectively have assistant director to operate, there is operation cost high, the information of multiple system is difficult to problems such as sharing, and the comprehensive monitoring system integrating each subsystem function becomes new development trend gradually.In comprehensive monitoring system, subsystems by integrated or interconnected, realizes being monitored by same Upper system, thus makes information can be effectively shared, and reduces workload, cuts operating costs.No matter be professional supervisory control system or comprehensive monitoring system, the magnitude control of modern supervisory control system, flowage structure, engineering framework is all far complicated.This just between system and the data communication of internal system have higher requirement, require the features such as the data communication of modern supervisory control system should have concurrently in real time, efficient, stable, healthy and strong.
For this reason, in modern supervisory control system hardware configuration, often through the communication channel that methods such as setting up the switch of two platform independent provides two independence available simultaneously between the transmitting apparatus of data and receiving equipment, thus realize hot standby pair of redundancy of hardware communication equipment, with the availability of safeguards system communication hardware.
But on the other hand, the data communication software in current supervisory control system, be otherwise known as communication protocol usually, mostly also adopts the connecting frame of cold standby.Only set up a communication based on a communication channel when namely normally running to connect for transmitting data.If because fault causes communication Joint failure, so reattempt and re-establish a new communication based on another communication channel and connect and replace original connection transmission data.Owing to needing after fault to re-establish connection, and to connect be the operation that a time overhead is larger, therefore there is longer time delay in this process, the monitor data in this process is often caused to be lost, this is commonly referred to as perturbation, now, there is the situation of step-out between receiving equipment and transmitting apparatus.For this reason, after having re-established effective connection, again must transmit total data thus again realize the data syn-chronization of receiving equipment and transmitting apparatus, this has been commonly referred to as reset.When data volume is larger time, such as, in comprehensive monitoring system application, this means very large communication-cost, also may incur loss through delay the new transmission producing monitor data simultaneously.And due to the site environment of track traffic complicated, some local serious interference, often network condition is unstable, easy appearance frequently switches the situation of communication channel, in this case, all need to re-establish connection to go forward side by side horizontal reset owing to switching at every turn, just seriously may incur loss through delay the normal transmission of signal of interest data, cause a hidden trouble.In extreme circumstances, likely because communication channel switches and retransmits all data too frequently, and occur that bitcom is stuck, cause whole supervisory control system to paralyse.
If all soft and hardwares of supervisory control system are all the system architectures adopting main frame and network all automorphis, this problem can be solved by adopting technology such as bottom hardware such as gathering IP or virtual IP address etc.But modern supervisory control system is due to application function complexity, and particularly comprehensive monitoring system also relates to numerous subsystem, and it must be a heterogeneous system that its autgmentability and opening determine it.
Summary of the invention
Given this, the application proposes a kind of not the resetting without the hot standby dual link method of perturbation of the modern complicated supervisory control system communication protocol of track traffic of being applicable to.Connecting by setting up two hot standby each other communications on two available communication channels simultaneously, effectively make use of the hardware resource of redundancy, and reasonably connecting switching law by setting, thus connecting time delay when switching when significantly reducing communication failure; Simultaneously by introducing the concept of affairs in database field, by completely isolated for the operation of communication data and communication data, set rational transaction types and operating process, and by carrying data mode mark in communication, fail before only retransmitting switching after making to connect switching the data transmitted, thus realize when not resetting still effective guarantee without perturbation, improve communication efficiency.Ensure the timely transmission of data, and be applicable to the situation of unstable networks.
Accompanying drawing explanation
Fig. 1 is the control flow chart that under the cold standby connecting frame of tolerance perturbation, communication connects.
Fig. 2 is the workflow diagram that under the cold standby connecting frame of band reset, communication connects.
Fig. 3 is the workflow diagram that hot standby next communication of dual link framework of the present invention connects.
Fig. 4 is the schematic diagram of two connection status conversions under hot standby dual link framework of the present invention.
Fig. 5 is communication flow of transactions schematic diagram of the present invention.
Fig. 6 is of the present invention reset without the schematic diagram of the control flow check flow process of the hot standby dual link framework of perturbation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
Bitcom in current monitor system, is also called communication reduction or communication protocol usually, mostly adopts cold standby connecting frame.Namely: normal only set up one based on an available communication channel when running and connect for transmission communication data; If connected because there is communication failure and losing efficacy, then close original connection, be switched to another communication channel, set up a new connection, replace original connections transmission data.
Because the time overhead setting up the new operation connected is larger, there is longer time delay in this process, therefore often cause the loss of monitor data, this situation is commonly referred to as perturbation.At this moment, two kinds of strategies of tackling are had.
The first, in not being very important applied environment, can ignoring the monitor data of loss, namely tolerate perturbation, continues communication process, transmit new monitor data.As shown in Figure 1, be under the cold standby connecting frame of tolerance perturbation, the control flow chart that communication connects.
This strategy is simply direct, but can cause the loss of the monitor data of short-term, for the applied environment that power monitoring or track traffic etc. are crucial, may cause operating a switch, stop transport, or even even more serious accident, so perturbation is flagrant.
Therefore, another kind of strategy is: after setting up new connection, again transmit whole data thus again realize the data syn-chronization of receiving equipment and transmitting apparatus, this process is commonly referred to as reset.
Fig. 2 is under the cold standby connecting frame of band reset, the workflow diagram that communication connects.
If adopt this strategy, in modern times large-scale supervisory control system such as comprehensive monitoring system application, because data volume is larger, reset and mean very large communication-cost, also may incur loss through delay the new transmission producing monitor data simultaneously.Particularly in the environment of network condition instability, if there is network situation off and on, likely make to connect frequent switching, to such an extent as to need constantly to set up newly to connect horizontal reset of going forward side by side, this just seriously may incur loss through delay the normal transmission of signal of interest data, even occur that bitcom is stuck, cause whole supervisory control system to paralyse.
In order to avoid this situation, the application proposes a kind of reset without the hot standby dual link method of perturbation.
First hot standby dual link framework is had a look:
Normal at system communication equipment, when namely two communication channels are all available, respectively by two independently communication channel respectively set up an effective communication and connect.It is homogeneity that these two communications connect, and may be used to transmission communication data.But use wherein connection transmission data, and another gives over to for subsequent use.
After original connection is due to reason inefficacies such as communication failures, another connection takes over rapidly original connection for transmitting data, and this just makes data immediately by the transmission of another communication channel, and not need immediately to re-establish connection.Due in the process of transmission data, significant data is generally prioritised transmission, and the timely transmission that this guarantees significant data can not be incured loss through delay.
Original connection disconnected because of communication failure can be closed, and on original passage, timing is attempted re-establishing connection then, till connection establishment success.This process had nothing to do with effective connection of transmitting data, and the process connected and transfer of data are parallel carries out, and can not cause delay to the transfer of data of carrying out simultaneously.Hot standby dual link that Here it is.
It should be noted that when the system is normal, two communication channels all can be used simultaneously, at this moment can set up two based on two passes and effectively connect.If but two connect simultaneously for transmitting data, so due to the isomery characteristic of network, just likely cause data re-transmission, loss or out of order, in order to avoid this problem, must ensure at any time to only have at most a communication to connect for transmitting data, if and another connects effectively, so do not allow to transmit data simultaneously, but the effective of connection must be maintained by sending the modes such as heartbeat message, for subsequent use with the moment.Therefore the State Transferring of two connections must defer to the rule of reasonable set.In order to the rule of the State Transferring that clear and definite description connects, communication is connected and is divided into three kinds of states:
Run mode, under this state, communication connects normal, for transmission communication data.
Idle state, under this state, communication connects normal, but only transmits heartbeat message maintenance connection.
Invalid state, connect under this state and not yet set up or lost efficacy due to fault, it is invalid that communication connects, and can not transmit data.
Fig. 3 is under hot standby dual link framework, the workflow diagram that a communication connects.
In order to ensure to only have at most at any time one to connect for transmission communication data, to communication connection status change the mechanism determine as follows.
Article two, when communication connects all normal, a connection is in run mode, and another connection is in Idle state.
If two connect and be in Idle state simultaneously, it is run mode that Stochastic choice one connects its State Transferring.
If one connection is in Idle state, another connection is in invalid state, and this connection will be converted to run mode.
For any connection, if normal state or idle dynamically under there is communication failure, Joint failure, so will transfer invalid state to, and close original connection, and attempt re-establishing connection.
For any connection, once establish new effective connection by what re-establish successful connection under invalid state, be so first converted to Idle state.
If two under the hot standby dual link framework State Transferring connected follow above-mentioned mechanism completely, just can ensure at any time to only have at most a connection to be in run mode.Fig. 4 is the schematic diagram of two connection status conversions under hot standby dual link framework, and wherein solid line represents stable state, and dotted line represents transition condition." point-folding " line represents Stochastic choice one connection, it is to be noted that
Although two connect the situation being all in Idle state likely to occur, can be found rapidly and be run mode by a wherein State Transferring connected, therefore this state is extremely short transient state of a kind of duration;
Article one, connect and recover from invalid state, as long as another connection is still in available state, the connection of recovery will maintain Idle state.Adopting the conversion regime of this inertia, causing the frequent problem switched mainly for avoiding unstable networks as far as possible.
Adopt hot standby dual link framework, after the Joint failure of transmission data, connection for subsequent use will be switched at once to transmit data, and not need immediately to re-establish connection, thus avoid the long delay of newly-built connection procedure.But this is not sufficient to ensure without perturbation, this is mainly because the situation of network communication fault is very complicated, be difficult to effectively determine when fault occurs, the data of Successful transmissions and the data not yet transmitted, if continue transmission new data, so just possibility obliterated data, if but again transmit the data be transmitted across, then may cause the reprocessing of data, particularly when communication operation and data processing operation mingle carry out time, this situation is difficult to avoid especially, unique method is exactly again transmit total data, thus the problem resetting and bring thus cannot be avoided.
In order to avoid perturbation when not resetting, which data normal transmission can be determined and which data does not have with regard to needs, accomplish this point, must characterize current state, therefore, here by introducing the related notion of database, specification and restriction are carried out to the framework of communication program.
First, the operating process that connects is called a control flow check, and the data that control flow check is accessed is divided three classes by effect:
Local data, namely control flow check carries out the set of the current application data processed according to the message of communication receiving/transmission and application demand.The process of this kind of data does not relate to data transmission procedure.
Connection status data, for the current connection state of characterization control stream.Once the state of current connection changes, connection status data will be upgraded.
Communication data, this comprises some temporal datas etc. of the data to be sent meeting certain format, the data to be analyzed received and the transmitting-receiving process use that control flow check generates according to local data states, is mainly used in ensureing the correct and efficient of transfer of data.
If control flow check to the order of the accessing operation of these three classes data without any restriction, access process is interlaced and be entrained in one piece, so once there is communication failure, which just have no idea clearly to distinguish data accessed mistake, which does not also have, switching after connecting is also to determine which data Successful transmissions, and which data does not also have and needs again to transmit.In order to address this problem, introduce the concept of the affairs of database field here.
Affairs operate form one atom process not becoming to split by one group, all operations namely in this process or all complete, or one does not occur.By using this concept of affairs, can divide operation, and defining corresponding state.Here two kinds of things types are defined,
Data transactions.Data transactions is made up of one group of operation to local data completely, does not wherein relate to any communication operation, does not namely allow to access any communication data and connection status data in a data transactions.
Communication affairs.Communication affairs are by data encasement and send---data accept and analyze---connection status and upgrade these steps and form, and Fig. 5 is the schematic flow sheet of communication affairs.Wherein the first two step relates to the operation of a series of communication data, and the 3rd step exists the renewal of connection status data, equally, does not allow to access any local data in a communication business process.
Each round of regulation control flow check forms by two affairs, and being first communication affairs, is then a data transactions.And control flow check is the continuous circulation of this round.If the communication of a round is normal, so when this round all completes, when namely communication affairs and data transactions correctly complete successively, control flow check successfully completes the transmission of the data of Last status in communication affairs, and connection status data remain unchanged, and by completing data transactions, local data is updated to next state.If there is problem and effectively cannot transmit data in communication affairs, such as communication failure causes Joint failure, and then be switched to connection for subsequent use, so connection status data will do corresponding renewal thereupon, but do not allow to revise any local data in the ensuing data transactions of same round, it is constant that local data will remain preceding state.Like this, by communication data and communication data isolation, and operate in units of affairs.Ensure that no matter whether connection status changes, local data or be in Last status, or be updated to next state, and an intermediateness in renewal can not be in.
Data manipulation based on affairs has atomicity, be in the front state of process, be in the state of processing, can not be mediated state, this identifies the state of data with regard to making it possible to, the simplest mode can adopt circulation incremental count, can certainly adopt alternate manner, as long as different with the status indicator processed just passable before ensureing each round local data process.The status indicator that the data that receiving-transmitting sides more each transmission comes are carried while each round transmission data, the status indicator of data carried transmission, as long as and just can determine whether loss of data or Data duplication.
The data just sent are preserved in right amount at transmitting terminal, transmitting terminal data mode can be given as an addition simultaneously when each transmission data, and at receiving terminal record, when communication failure and after being switched to connection for subsequent use, as long as compare the state of two ends record, just can know the non-transmission success of which data, as long as now again transmit the data of non-transmission success; Or transmitting terminal transmits the data of all preservations, then before abandoning switching by receiving terminal the data of Successful transmissions to avoid reprocessing.Data are neither lost no matter to adopt which kind of mode to ensure, also not reprocessing, effectively avoids perturbation.Owing to not needing after communication failure to re-establish connection, be only be switched to connection for subsequent use, this is the process that a time overhead is very little.Therefore, be no matter the data of the firm transmission that transmitting terminal is preserved, or switch connect after the data again transmitted, all very limited, compared to reseting procedure, almost negligible, therefore can not cause unnecessary huge extra communication-cost, also can not hinder the transmission of data after switching.Particularly when unstable networks, there will be the frequent situation switching communication and connect, all need to reset after switching if each, so the communication-cost of frequent recovery band is almost unacceptable, and the serious delay that important information transmits may be caused, even cause systemic breakdown.This hot standby dual link framework do not resetted without perturbation that the application proposes can effectively help to avoid this situation, thus is highly suitable for the bad environment of network condition.Fig. 6 is the schematic diagram do not resetted without the control flow check flow process of the hot standby dual link framework of perturbation.
The application proposes a kind of not the resetting without the hot standby dual link framework of perturbation of the modern supervisory control system bitcom of track traffic of being applicable to.This framework is set up two hot standby each other communications simultaneously and is connected on two available communication channels, effectively make use of the hardware resource of redundancy, and reasonably connects switching law by setting, thus connect time delay when switching when significantly reducing communication failure; Simultaneously, by introducing the concept of affairs in database field in this framework, by completely isolated for the operation of communication data and communication data, and set rational transaction types and operating process, again by carrying data mode mark in communication, make connect switch after only retransmit switch before fail transmission data, thus realize when not resetting still effective guarantee without perturbation, improve communication efficiency.Ensure the timely transmission of data, and be particularly useful for the environment of unstable networks.
Above embodiment is just described for partial function of the present invention, but embodiment and accompanying drawing are not of the present invention for limiting.Without departing from the spirit and scope of the invention, any equivalence change done or retouching, belong to the protection range of the present invention equally.Therefore the content that protection scope of the present invention should define with the claim of the application is standard.
Claims (1)
1. do not reset without a hot standby dual link method for perturbation, when system communication equipment is normal, respectively by two independently communication channel respectively set up an effective communication and connect, wherein one connects transmission data, and another gives over to for subsequent use, after original connection is due to the inefficacy of communication failure reason, another connection takes over rapidly original connection for transmitting data, this just makes data to be transmitted by another communication channel immediately, and do not need immediately to re-establish connection, original connection disconnected because of communication failure can be closed, then on original passage, timing is attempted re-establishing connection, till connection establishment success, when system communication equipment is normal, article two, communication connection realizes only having a communication to connect for transmitting data by State Transferring, another communication connection maintains the effective of connection by sending heartbeat message mode, moment is for subsequent use, when system communication equipment fault, carry out connection and switch, described State Transferring communication is connected to be divided into three kinds of states: run mode, and under this state, communication connects normal, for transmission communication data, Idle state, under this state, communication connects normal, but only transmits heartbeat message maintenance connection, invalid state, connect under this state and not yet set up or lost efficacy due to fault, it is invalid that communication connects, and can not transmit data, it is characterized in that:
By the operation isolation of communication data and communication data, and set rational transaction types and operating process, then by carrying data mode mark in communication, thus make to connect switch after only retransmit switch before to fail the data of transmission;
Article two, when communication connects all normal, a connection is in run mode, and another connection is in Idle state;
If two connect and be in Idle state simultaneously, it is run mode that Stochastic choice one connects its State Transferring;
If one connection is in Idle state, another connection is in invalid state, and described Idle state connects will be converted to run mode;
For any connection, if there is communication failure under run mode or Idle state, Joint failure, so will transfer invalid state to, and close original connection, and attempt re-establishing connection;
For any connection, once establish new effective connection by what re-establish successful connection under invalid state, be so first converted to Idle state;
The data just sent are preserved in right amount at transmitting terminal, transmitting terminal data mode can be given as an addition simultaneously when each transmission data, and at receiving terminal record, when communication failure and after being switched to connection for subsequent use, as long as compare the state of two ends record, just can know the non-transmission success of which data, as long as now again transmit the data of non-transmission success; Or transmitting terminal transmits the data of all preservations, then before abandoning switching by receiving terminal the data of Successful transmissions to avoid reprocessing;
Article one, the operating process connected is a control flow check, and the data of control flow check access have three kinds,
Local data: control flow check carries out the set of the current application data processed according to the message of communication receiving/transmission and application demand, the process of this kind of data does not relate to data transmission procedure;
Connection status data: for the current connection state of characterization control stream, once the state of current connection changes, will upgrade connection status data;
Communication data: some temporal datas comprising the data to be sent meeting certain format, the data to be analyzed received and the transmitting-receiving process use that control flow check generates according to local data states;
Affairs operate by one group the impartible atom process formed, and described transaction types divides two kinds:
Data transactions: data transactions is made up of one group of operation to local data completely, does not wherein relate to any communication operation, does not namely allow to access any communication data and connection status data in a data transactions;
Communication affairs: communication affairs are by data encasement and send---data accept and analyze---connection status and upgrade these steps and form, wherein the first two step relates to the operation of a series of communication data, and there is the renewal of connection status data in the 3rd step, equally, do not allow to access any local data in a communication business process;
Each round of control flow check is by communication affairs and data transactions composition, if the communication of a round is normal, control flow check successfully completes the transmission of the data of Last status in communication affairs, and connection status data remain unchanged, and local data is updated to next state by completing data transactions; If there is problem and effectively cannot transmit data in communication affairs, and then be switched to connection for subsequent use, so connection status data will do corresponding renewal thereupon, but do not allow to revise any local data in the ensuing data transactions of same round, it is constant that local data will remain preceding state;
I.e. communication data and communication data isolation;
The status indicator that the data that receiving-transmitting sides more each transmission comes are carried while each round transmission data, the status indicator of data carried transmission, as long as and just can determine whether loss of data or Data duplication.
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| CN106452854B (en) * | 2016-09-27 | 2019-04-26 | 南京国电南自轨道交通工程有限公司 | A kind of subway comprehensive monitoring system synchronous communication method based on multi-connection master-slave redundancy |
| CN108134700B (en) * | 2017-12-22 | 2021-04-20 | 南京因泰莱电器股份有限公司 | Method for realizing electric power automation communication data integrity |
| CN109041262B (en) * | 2018-08-23 | 2020-06-16 | Oppo广东移动通信有限公司 | Data transmission method and related device |
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