KR20010060015A - Apparatus And Method For Transmission/Receiving Large Volumes Of Message In Satellite Mobile Data Service(SMDS) System - Google Patents

Abstract

PURPOSE: An apparatus and a method for transceiving a large volume message in a satellite travel data service system is provided to compress data before sending a large volume of electronic data interchange(EDI) data in consideration of hardwarical limits of a mobile station. CONSTITUTION: A communication module(32) is in charge of transceiving packets between a vehicle satellite antenna(31) and an EDI data receiving controller(33). The EDI data receiving controller(33) performs the function of colligating the receiving of EDI data. A data decompressor(34) decompresses the compressed and received EDI data. An EDI data coupler(35) checks a message header information in the packet delivered from the EDI data receiving controller(33) and, if the message is a single message, separates only the message header from the message to deliver the same to an EDI message management module(36).

Description

Apparatus And Method For Transmission / Receiving Large Volumes Of Message In Satellite Mobile Data Service (SMDS) System}

The present invention relates to an apparatus for transmitting / receiving large messages in a satellite mobile data service system, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method.

Satellite networks (for example, Mugunghwa satellite network) (hereinafter referred to simply as "Mugunghwa satellite network") are used in vehicle mobile stations for vehicle satellite antennas with a data rate of 165 bps and a maximum packet size of 1425 binary data. It is limited to bytes and only up to 3 packets can be stored in the built-in transmit buffer.

In addition, the interface used by the satellite antenna and the mobile terminal device is a null-modem half-duplex method. When a request is sent from the mobile terminal device to the satellite antenna, the satellite antenna supplies the corresponding function. After executing, it works by responding to the result.

In the mobile station of Mugunghwa satellite network using this communication method, small size data can be communicated, but EDI data of more than 1425 bytes cannot be transmitted / received, and reliability of data transmission and reception between sender and receiver is also provided. There is a problem that can not.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in consideration of the hardware limitations of the mobile station, compresses the data before transmitting a large amount of electronic document exchange (EDI) data, examines the compressed data size, and has a size of 1 packet. Provides a large-capacity message sending / receiving device of a satellite mobile data service system for dividing data and transmitting / receiving data by message, and a computer-readable recording medium having recorded thereon a program for implementing the method. Its purpose is to.

1 is a conceptual diagram of an embodiment of a satellite network mobile station system to which the present invention is applied;

2 is a block diagram of an embodiment of an electronic document interchange (EDI) data transmission apparatus according to the present invention;

3 is a block diagram of an embodiment of an electronic document interchange (EDI) data receiving apparatus according to the present invention;

4 is an exemplary diagram illustrating an electronic document interchange (EDI) data segmentation message header configuration according to the present invention.

5 is a flowchart of an embodiment of an electronic document interchange (EDI) data transmission method in accordance with the present invention.

6 is a flow diagram of one embodiment of a method for receiving electronic document interchange (EDI) data in accordance with the present invention.

The present invention for achieving the above object, in the large-capacity message transmission apparatus of the satellite mobile data service system, requesting compression of the data to be transmitted and request management of the compressed data, and the packet for the satellite antenna and the data Data transmission processing means for exchanging data; Data compression means for performing a compression function on the data when there is a compression request from the data transmission processing means; When the size of the compressed data that is requested to be managed by the data transmission processing means is large, the data is divided into unit messages, a message header is added to each message, and the packets are transmitted to the data transmission processing means one by one in order. Data dividing means for; And transmission packet management means for managing a message in which transmission to the satellite antenna is not completed among the divided messages of the data partitioning means.

In addition, the present invention is a large-capacity message receiving apparatus of the satellite mobile data service system, and sends a request packet to check whether there is data received by the satellite antenna, and if there is data transmitted by sending a received data request packet to receive data Receiving processing means; Data combining means for combining the messages stored separately by using the message header information in the packet transferred from the data receiving processing means; Divided message management means for storing and managing the divided messages delivered from said data receiving processing means and for delivering the divided messages to said data combining means upon request of said data combining means; And decompression means for decompressing and storing and managing data received through the data receiving processing means.

In addition, the present invention provides a large-capacity message transmission method applied to a large-capacity message transmission apparatus of a satellite mobile data service system, comprising: a first step of reading and compressing data to be transmitted; A second step of dividing the compressed data into a unit message size when the size of the compressed data is larger than a message size that can be included in one message frame; A third step of adding and storing a message header for each of the divided messages; And a fourth step of sequentially transmitting the divided messages to the satellite antenna.

In addition, the present invention provides a mass message receiving method applied to a mass message receiving apparatus of a satellite mobile data service system, comprising: a first step of sending a data request packet to a satellite antenna and obtaining and storing the received packet; A second step of combining the divided messages using the message header information in the received packet; And a third step of decompressing and storing the combined message.

In addition, the present invention provides a large-capacity message transmitting apparatus of a satellite mobile data service system having a large-capacity processor for transmitting a large-capacity message, comprising: a first function of reading and compressing data to be transmitted; A second function of dividing the compressed data into a unit message size when the size of the compressed data is larger than a message size that can be included in one message frame; A third function of adding and storing a message header for each of the divided messages; And a computer readable recording medium having recorded thereon a program for realizing a fourth function of sequentially transmitting the divided messages to a satellite antenna.

In addition, the present invention provides a large capacity message receiving apparatus of a satellite mobile data service system having a large capacity processor for receiving a large message, comprising: a first function of sending a data request packet to a satellite antenna and obtaining and storing a received packet; A second function of combining the stored messages using the message header information in the received packet; And a computer readable recording medium having recorded thereon a program for realizing a third function of decompressing and storing the combined message.

In the present invention, in order to be able to distinguish the divided messages, the transmission request for transmission to the vehicle satellite antenna including a message header containing information such as data unique number, sequence number, message size, and the like. When receiving data, the message header is also used to combine the divided data and decompress the compressed data to restore Electronic Data Interchange (EDI) data (hereinafter simply referred to as "EDI") data. In addition, the transmitting side stores each transmission packet even after transmitting the EDI data so that the receiving side can retransmit if the 'transmission complete' message does not arrive within a predetermined time.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to FIGS. 1 to 7.

1 is a conceptual diagram of an embodiment of a satellite network mobile station system to which the present invention is applied.

The satellite (for example, Mugunghwa satellite) (hereinafter referred to simply as "Mugunghwa satellite") 11 is located 36,000 km above the ground and serves to relay communications between the satellite earth station and the vehicle mobile station.

The vehicle mobile station is composed of a vehicle satellite antenna 12 and a mobile terminal device 13, the vehicle satellite antenna 12 is installed in the vehicle and has the data requested by the mobile terminal device 13 with a satellite and a transmission speed of 165bps. Performs a send and receive function.

The vehicle satellite antenna 12 is connected to a mobile terminal device through a null modem RS-232 cable, and there is an internal buffer for communication with the satellite. The size of this buffer is 3 packets when transmitting. Due to the size limitation, a buffer overflow may occur when transmitting EDI data having a large data size. The mobile terminal device is a portable computer with an RS-232 port that generates EDI data and requests transmission to the satellite antenna, or takes the EDI data received from the satellite antenna and converts it into an EDI document.

2 is a configuration diagram of an embodiment of an electronic document interchange (EDI) data transmission apparatus according to the present invention, and is mounted in a mobile terminal apparatus of a vehicle mobile station.

The communication module 22 is responsible for packet transmission / reception between the vehicle satellite antenna 21 and the EDI data transmission controller 23. The communication module 22 mainly transmits a request packet generated by the EDI data transmission controller to the satellite antenna, Receives a response packet transmitted from an antenna and hands it over to an EDI data transmission controller.

The EDI data transmission controller 23 performs the function of managing the EDI data transmission. The EDI data transmission controller 23 receives the EDI data 29 to be transmitted, requests the data compressor 24 to compress it, and sends the compressed data to the EDI data divider 25. . In addition, the transmission packet sent from the EDI data splitter is requested to be transmitted to the satellite antenna through the communication module, and then received and processed.

The data compression module 24 performs a compression function to reduce the size of the EDI data to be transmitted.

The EDI data divider 25 adds a message header when the size of the compressed data is 1407 bytes or less, constructs a transmission packet, and sends it to the transmission packet manager 26 and the EDI data transmission controller, and 1407 when the data size exceeds 1407 bytes. The packet is divided into byte-by-byte messages and message headers are added to each message, and then transmitted to the transmission packet manager, and then one packet is sequentially transmitted to the EDI data transmission controller.

The transmission packet manager 26 manages transmission packets that have been transmitted but are still stored so that they can be retransmitted because the EDI data receiver has not sent a 'reception complete' message. After storing the transmission packets, the corresponding packets are deleted when the 'reception complete' message is received.

The internal memory 27 stores the transmitted packets in a double linked list structure using data unique numbers as indexes.

The backup storage device 28 operates in case the system is abnormally terminated and the internal memory is erased. When the EDI data transmission controller is initially created, the backup storage device 28 searches for the backup storage device and reads the stored transmission packets into the internal memory.

The EDI data 29 to be transmitted is EDI data to be generated in the mobile terminal device and transmitted to the receiving side.

3 is a configuration diagram of an embodiment of an electronic document interchange (EDI) data receiving apparatus according to the present invention, which is mounted on a terminal device 13 of a vehicle mobile station.

The communication module 32 is responsible for packet transmission / reception between the vehicle satellite antenna 31 and the EDI data reception controller 33. The communication module 32 mainly transmits a request packet generated by the EDI data reception controller to the satellite antenna and transmits the data from the satellite antenna. It receives the response packet and delivers it to the EDI data receiving controller.

The EDI data receiving controller 33 performs the function of managing the EDI data reception, and sends a request packet for checking whether there is data received by the satellite antenna at regular intervals, and if there is data transmitted by the satellite antenna, sends the received data request packet. Get and pass to the EDI data combiner (35).

Then, after decompressing the data sent by the EDI data combiner through the data decompressor 34, storing the data as EDI data 39 and constructing a 'receive completion' message indicating that the EDI data sender received the message normally. send.

The data decompressor 34 decompresses the compressed and received EDI data.

The EDI data combiner 35 checks the message header information in the packet transferred from the EDI data receiving controller 33, and separates only the message header and transmits the message to the EDI data receiving controller if the message is a single message. If the message is a split message but not the end of the data, it is passed to the split EDI message management module 36. If the split message is the last part of the data, the split EDI message manager takes the pre-stored split messages and combines them. Then, the completed EDI compressed data is transmitted to the EDI data receiving controller.

The partitioned EDI message manager 36 stores / manages received partitioned EDI messages. The partitioned EDI message manager 36 partitions the EDI messages in the internal memory into a dual-linked list structure in which the EDI data unique number included in the message header is indexed. (37) is stored, and the same contents are recorded in the backup auxiliary storage device 38 as well. The messages stored in the auxiliary storage exist in case the mobile terminal device terminates abnormally and the contents of the divided messages stored in the internal memory disappear. The backup storage device is searched when the EDI data receiving controller is first created. The stored EDI messages are read into the internal memory.

The received EDI data 39 is data which is finally passed to the EDI application after the combining and decompression process is completed.

4 is an exemplary diagram illustrating a configuration of an electronic document interchange (EDI) data fragmentation message header according to the present invention.

Data type 41 indicates the type of message being sent and has values of 'EDI data (1)', 'resend request (2)', 'receive complete (3)', with message type 'resend request' If so, the message receiver must retransmit the data corresponding to the data unique number included in the message header. If the message is received, the message receiver deletes the data corresponding to the data unique number stored for memory and backup.

Data unique number 42 is a unique number for identification between EDI data and consists of two digits and can be assigned 100 different unique numbers from '00' to '99', '00' next to '99' It is numbered in a circular structure.

The total number of messages 43 indicates the total number of messages generated by dividing the EDI data, and can be divided into a maximum of 99 messages. The current message number 44 indicates the number of messages on the divided EDI data. .

The destination 45 uses seven digits as the number of the recipient to which the message is to be received.

The message size 46 represents the size of the divided message and has a value between 1 and 1407, and the message content 47 contains EDI data transmitted.

5 is a flowchart of an embodiment of an electronic document interchange (EDI) data transmission method according to the present invention.

The EDI data transmission controller reads the EDI data to be transmitted (501) and compresses the data through the data compressor (502).

When the EDI data transmission controller passes the compressed EDI data to the EDI data divider, the EDI data divider checks the size of the compressed EDI data (503) and divides the data into units of 1407 bytes if it is larger than 1407 bytes.

For EDI messages or fragmented EDI messages of 1407 bytes or less, a message header is added to each message to form a transmission packet and forwarded to the transmission packet manager, and the transmission packet manager stores each packet as a data unique number as a key value. It is stored in the backup storage device (506).

When the transmission packets are completed, the EDI data transmission controller reads one transmission packet and makes a transmission request to the satellite antenna through the communication module (507). The EDI data transmission controller waits for a response to the transmission request from the satellite antenna (508). If the response packet does not arrive until the waiting time limit is exceeded (510), the communication module retransmits the previously transmitted packet (511).

If a response packet sent by the satellite antenna is received before the latency limit is reached (509), it checks whether there are remaining packets to be transmitted (509), and if there are remaining packets to be transmitted, continues to transmit and if not remaining (512). )do.

When the 'receive complete' message sent from the EDI data receiving side arrives while performing another operation (513), the EDI data sender deletes the transmission packets stored in the memory and the backup storage (514). If the 'reception complete' message does not arrive by the time limit, the corresponding transmission packets are retransmitted.

6 is a flowchart of an embodiment of an electronic document interchange (EDI) data receiving method according to the present invention.

The EDI data receiving controller checks whether the divided EDI messages are stored in the backup storage device at the first startup (601) and stores the stored messages in a dual linked list on the internal memory (602).

The EDI data reception controller checks whether there is data received by the satellite antenna at regular intervals (603). If there is no data received, the EDI data reception controller starts a timer to wait for a predetermined time (604), and the satellite antenna notifies that there is received data. When the request packet is sent to the satellite antenna through the communication module to bring one received packet (605).

The EDI data receiving controller examines the message header of the received received packet to check whether the message on the received packet is a separated message (606). If the received message is not a separate message, it is decompressed through the data decompressor (611), the completed EDI data is stored (612), and the EDI data sender sends a 'receive complete' message indicating that the EDI data was normally received. (613).

If the received message is a separate message (606), the message is checked to see if it is the last separated message, and if it is not the last message, it is sent to the divided EDI message manager and the data unique number is indexed and stored in the dual linked list on internal memory and the backup storage device. Afterwards (608), the message receiving operation is continued, and if it is the last message, the received message is delivered to the EDI data combiner to combine the divided messages into the original EDI data (609), and the fragmented messages stored in the internal memory and the backup storage device are deleted. 610.

The combined original EDI data is decompressed using the decompressor (611), the completed EDI data is stored (612), and the EDI data sender sends a 'receive complete' message indicating that the EDI data has been normally received ( 613).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention separates the transmission data into message units so that EDI data can be transmitted / received in consideration of the transmission speed or the limitation of the communication protocol in the MWC mobile station, and then adds a message header to increase the size of the transmission data. It overcomes the limitations, compresses the data to be transmitted, and reduces the data size to enable efficient communication even at low transmission rates.The sender uses a method of storing transmitted packets until a 'receive' message is received at the receiver. Enable EDI data communication by ensuring end-to-end reliability.

Claims (8)

In the large-capacity message transmission apparatus of the satellite mobile data service system, Data transmission processing means for requesting compression of data to be transmitted and requesting management of the compressed data, and for exchanging a packet for the data with a satellite antenna; Data compression means for performing a compression function on the data when there is a compression request from the data transmission processing means; When the size of the compressed data that is requested to be managed by the data transmission processing means is large, the data is divided into unit messages, a message header is added to each message, and the packets are transmitted to the data transmission processing means one by one in order. Data dividing means for; And Transmission packet management means for managing a message in which transmission to the satellite antenna is not completed among the divided messages of the data partitioning means; Mass message sending apparatus comprising a. The method of claim 1, The data of the data transmission processing means is electronic document exchange (EDI) data. In the large-capacity message receiving apparatus of the satellite mobile data service system, Data receiving processing means for sending a request packet for confirming whether there is data received by the satellite antenna and for receiving data by sending a received data request packet if there is transmitted data; Data combining means for combining the messages stored separately by using the message header information in the packet transferred from the data receiving processing means; Divided message management means for storing and managing the divided messages delivered from said data receiving processing means and for delivering the divided messages to said data combining means upon request of said data combining means; And Decompression means for decompressing and storing data received through the data receiving processing means Mass message receiving device comprising a. In the large-capacity message transmission method applied to the large-capacity message transmission apparatus of the satellite mobile data service system, A first step of reading and compressing data to be transmitted; The size of the compressed data may be included in one message frame If larger than the message size, dividing into a unit message size; A third step of adding and storing a message header for each of the divided messages; And A fourth step of sequentially transmitting the divided messages to a satellite antenna Large message transmission method comprising a. The method of claim 4, wherein And said data of said first step is electronic document interchange (EDI) data. In the large-capacity message receiving method applied to the large-capacity message receiving apparatus of the satellite mobile data service system, A first step of sending a data request packet to a satellite antenna and obtaining and storing a received packet; A second step of combining the divided messages using the message header information in the received packet; And Third step to decompress and save the combined message Large message receiving method comprising a. In order to transmit a large message, a large message transmission apparatus of a satellite mobile data service system having a large processor, A first function of reading and compressing data to be transmitted; A second function of dividing the compressed data into a unit message size when the size of the compressed data is larger than a message size that can be included in one message frame; A third function of adding and storing a message header for each of the divided messages; And A fourth function of sequentially transmitting the divided messages to the satellite antenna A computer-readable recording medium having recorded thereon a program for realizing this. In order to receive a large message, a large message receiving apparatus of a satellite mobile data service system having a large processor, A first function of sending a data request packet to a satellite antenna and obtaining and storing a received packet; A second function of combining the stored messages using the message header information in the received packet; And Third function to decompress and save the combined message A computer-readable recording medium having recorded thereon a program for realizing this.