CN101908952A

CN101908952A - Offline data self-detection retransmission method

Info

Publication number: CN101908952A
Application number: CN 201010245671
Authority: CN
Inventors: 刘润华
Original assignee: SUNTEK TECHNOLOGY Co Ltd
Current assignee: SUNTEK TECHNOLOGY Co Ltd
Priority date: 2010-08-05
Filing date: 2010-08-05
Publication date: 2010-12-08

Abstract

The invention provides an offline data self-detection retransmission method, and provides an improved method for processing offline data of a rail transit automatic ticket sales and inspection system by using a reliable message retransmission method and an offline data self-detection method. The method eliminates the probability of triviality and errors during manual maintenance of offline data, improves the integrity of the offline data and reduces the maintenance cost of stations.

Description

A kind of offline data self-detection retransmission method

Technical field

The invention belongs to the track traffic electronic information technical field, particularly a kind of off-line data self check check weighing passes, and the application of this method in automatic ticket selling system for rail traffic.

Technical background

Along with the urban construction fast development, track traffic has become the most important basic vehicles in the urban life.Therefore track traffic relies on higher to automatic ticket-selling system because the stream of people is big.Rail traffic ticket automatic selling and checking system comprises station equipment, station centre's computer, subsystems such as wire center computer.Wherein station equipment comprises automatic machine, gate, equipment such as semi-automatic box office ticket machine.The TCP/IP mode of passing through between each subsystem and the equipment realizes interconnected, to realize the control to equipment, functions such as the transmission of data.

Rail traffic ticket automatic selling and checking system requires station equipment, and station centre's computer can work alone, promptly at network failure, in the time of some device fails, still can independently carry out automatic ticketing, the function of ticket checking makes the normal vote buying of passenger unaffected by bus automatically.Under the equipment off-line situation, the ticketing that equipment produces, transaction data such as ticket checking can't be uploaded by network communication mode, and present solution is, in operation during end of day, use movable storage device to sell on the ticket-check equipment copy transaction record to the station by the station staff and upload.The problem that this mode occurs easily has: manual operation is easy to generate error, and data have the mistakes and omissions situation and take place; If equipment network in a period of time interrupts, and has recovered the network connection, the data in break period are in time uploaded, and the real-time of data is affected.

Along with the progress of science and technology, how to design and a kind ofly can keep off-line data integrality and accuracy, can realize the method that automatic ticket selling system for rail traffic provides off-line data self check check weighing to pass, be that relevant departments expect, have broad application prospects.

Summary of the invention

The objective of the invention is at existing automatic ticket selling system for rail traffic under the equipment off-line situation, the ticketing that equipment produces, problems such as transaction data such as ticket checking can't be uploaded by network communication mode, data are imperfect, accuracy is low, provide a kind of high efficiency, high stability, high completeness in the solution of one, can well guarantee to keep under the automatic ticket-selling system off-line state data integrity and accuracy.

In order to realize goal of the invention, the technical scheme of employing is as follows:

A kind of offline data self-detection retransmission method, its former reason is based on the authentic data repeating method with based on the detection method certainly of the reliable retransmission method formation that combines.

The overtime retransmission mechanism of authentic data repeating method imitation TCP.The purpose of reliable news transmission be guarantee message do not have lose, do not have repetition, ensuring escapement from confliction is sent to the other side.

At first explanation, the reliable news transmission principle of Communication Layer (Transmission Control Protocol).The target of Transmission Control Protocol is to guarantee reliability of data transmission on insecure IP agreement basis.For this reason, Transmission Control Protocol is numbered byte stream, appends check code and pack to mail to destination host, by the ACK that destination host returns, confirms whether data arrive.The data of being confirmed by ACK do not mail to destination host again by Transmission Control Protocol.Do not interrupt if the TCP communication connects, Transmission Control Protocol itself can guarantee have under the situations such as packet loss, data collision, error in data at communication link, and data reliably, inerrably are sent to the other side always.

Because the characteristics of " the Communication Layer reliable transmission " of Transmission Control Protocol, the Internet protocol of operation is substantially based on Transmission Control Protocol at present.The reliable news transmission is reached the purpose of " application layer reliable transmission " with the principle of similar Transmission Control Protocol.Reliable news is transmitted in application layer ACK and sequence number is set, and guarantees that data not only do not have to lose, do not have repetition, do not have conflict and be transferred to peer, and is finished dealing with by peer.

In order to prevent information drop-out, transfer of data was divided into for 5 steps:

1. send data to destination host

2. destination host is handled and is stored the data of receiving, if the data processing failure, then retry is 3 times.If still do not have

Method storage data change abnormality processing over to.In the case, do not send ACK.

3. transmitting terminal is not received ACK, data retransmission.

4. destination host is replied ACK

5. transmitting terminal receives ACK, confirms that data send successfully.

Network under the unrecovered situation, is promptly entering off-line mode with destination host in the time of agreement.

Being divided into based on the detection method certainly of reliable retransmission method is to finish in two stages.

At first, carry out the off-line data sign.As shown in Figure 1 based on the reliable retransmission method to the data processing of classifying, the package identification of receiving ACK is for uploading data, otherwise is masked as off-line data.Data qualification is stored in the file.

Secondly, carrying out off-line data detects and retransmits.When device network recovers as shown in Figure 2, upload classified off-line data in described.Because the packet of not receiving ACK causes the recipient to handle, and then do not send ACK because of the packet data mistake, therefore needed packet is detected verification msg packet format legitimacy before last time in data.Be verified as normal packet and upload, reuse phase I off-line data sign packet is reclassified.

Description of drawings

Fig. 1 is an off-line data sign schematic diagram of the present invention;

Fig. 2 is that off-line data of the present invention detects and the re-transmission flow chart;

Fig. 3 is automatic machine communication module signal of the present invention;

Fig. 4 is the schematic flow sheet that communicates to connect of the present invention;

Fig. 5 is a real time data flow process schematic diagram of the present invention.

Embodiment

For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

Example 1: automatic machine communication module application the present invention carries out the equipment transmission of transaction data as shown in Figure 3.Wherein said system comprises 1. automatic machines, for data receiver 2. station centre's computers are the data receiver.

Described automatic machine is by communication module, and transaction modules, file system etc. are partly formed.Described automatic machine communication module has been used method provided by the invention.Described transaction modules is a Data Source.Described file system is used for storage.

Described automatic box office ticket machine and described station centre computer connection procedure are referring to Fig. 4, and detailed process is as follows:

1. the box office ticket machine connects station centre's computer automatically

2. successful connection then begins to detect off-line data

3. have under the off-line data situation, send off-line data

4. send and successfully then delete the off-line data file

5. do not have to forward the processing real time data under the off-line data situation

6. send network in above each step and interrupt situation, got back to for the 1st step

Handle the real time data flow process described in Fig. 4 referring to Fig. 5, detailed process is as follows:

1. handle the transaction data that produces from transaction modules.

2. transmission transaction data.

3. send under the transaction data success situation, storage has been uploaded transaction data and has been got back to step 1.

4. send under the transaction data failure scenarios, resend.

5. send under 3 situations of transaction data failure, be saved in the off-line trading data file.

6. disconnect connection, get back to the described step 1 of connection procedure among Fig. 4.

7. network takes place in above each step interrupt situation, transaction is saved in the off-line trading data file, and gets back to the described step 1 of connection procedure among Fig. 4.

Above Fig. 4 and Fig. 5 have illustrated that automatic machine is connected and the transmission of transaction data process with the network of station centre computer, and this process can amplify equally and be avail data, transmission such as audit data.Simultaneously, described automatic machine as data receiver is replaceable to be gate, station equipments such as semi-automatic box office ticket machine.Replaceable as station centre's computer of data receiver is data processing centres such as circuit central computer.

Claims

1. offline data self-detection retransmission method, it is characterized in that having adopted described reliable news retransmit mode in conjunction with described off-line data from the detection method;

2. reliable news repeating method according to claim 1 is characterized in that adopting the ACK banner message successfully to handle, to the communication means of not receiving that ACK retransmits;

3. whether reliable news repeating method according to claim 1 is characterized in that using data validity detection validation validity, use the off-line data flag data successfully to send;

4. data validity detection method according to claim 3, its protection feature is using protection point 2 described ACK to indicate the method for off-line data.