KR101351665B1 - Method of communicating a data of a mobile communication terminal using a negotiation of a trust level - Google Patents

Abstract

The present invention relates to a data communication method of a mobile communication terminal through negotiation of a reliability level. A data communication method of a mobile communication terminal according to an embodiment of the present invention comprises determining a reliability level by negotiating a reliability level between a transmitting mobile terminal and a receiving mobile communication terminal, and depending on the reliability level determined by the negotiation. Performing a data packet communication by using a different communication scheme.

Reliability, OBEX, Mobile Terminal, Packet, Checksum, Data Communication

Description

Method of communicating a data of a mobile communication terminal using a negotiation of a trust level

1 is a block diagram illustrating a configuration of a mobile communication terminal according to an embodiment of the present invention.

2 is a flowchart provided to explain a data communication method of a mobile communication terminal according to an embodiment of the present invention;

3 is a flowchart provided to explain a data communication method of a mobile communication terminal when a reliability negotiation is performed at a high level according to an embodiment of the present invention;

4 is a view showing in more detail the step S300 of FIG.

5A is a diagram illustrating a process of transmitting a data packet from a transmitting mobile terminal to a receiving mobile communication terminal, and a process of receiving a response from the receiving mobile communication terminal;

5B is a diagram illustrating a packet transmission process between a transmitting mobile communication terminal and a receiving mobile communication terminal when an error occurs as a result of checksum calculation;

5C is a diagram illustrating a packet transmission process between a transmitting mobile terminal and a receiving mobile terminal when data packets are not sequentially received according to packet numbers;

6 is a flowchart provided to explain an OBEX communication method of a mobile communication terminal when the reliability negotiation is performed at the middle level according to an embodiment of the present invention;

7 is a view showing step S600 in more detail;

FIG. 8 is a diagram illustrating step S610 and step S620 in more detail;

9 is a flowchart provided to explain a data communication method of a mobile communication terminal when reliability negotiation is performed at a low level according to an embodiment of the present invention;

FIG. 10 is a view more specifically illustrating FIG. 9.

Explanation of symbols on the main parts of the drawings

100a: transmitting mobile terminal

100b: receiving mobile terminal

The present invention relates to a data communication method of a mobile communication terminal through negotiation of a reliability level.

OBEX (Object Exchange protocol) is an Infrared Data Association (IrDA Association) standard that requests and responses between devices that provide a data model for representing an object, information about an object, and a standard format for transmitting an object. The protocol for the transmission.

As the compatibility of mobile communication terminals and peripheral devices is important, universal and simple OBEX communication is attracting attention again. Traditional OBEX communication involved only file transfers, regardless of the importance of the data.

In other words, the existing OBEX communication has been developed for high speed data transmission, but there is a problem that is not suitable for data communication requiring high data reliability.

Accordingly, an aspect of the present invention is to provide a data communication method of a mobile communication terminal through negotiation of a reliability level capable of providing high-speed data transmission and communication with high reliability through negotiation of a reliability level. .

The technical objects to be achieved by the present invention are not limited to the technical matters mentioned above, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

According to an aspect of the present invention, there is provided a data communication method of a mobile communication terminal, comprising: determining a reliability level by negotiating a reliability level between a transmitting mobile communication terminal and a receiving mobile communication terminal; And performing data packet communication by varying a communication method according to a reliability level determined by the negotiation.

The data packet communication means OBEX (Object Exchange) communication.

The determining of the reliability level may include: receiving a packet including reliability level information set in the transmitting-side mobile communication terminal; And responding with a maximum reliability level that can be processed based on the reliability level information.

The reliability level is determined by any one of a high level, a middle level, and a low level.

When the reliability level is determined as the high level, it is determined whether an error is detected through checksum calculation for each data packet received from the transmitting mobile communication terminal, and it is checked whether the data packets are sequentially received. At this time, when an error occurs in the received data packet or the data packet is not received sequentially, a request for retransmission of the data packet is performed in real time.

When the reliability level is determined to be a middle level or a low level, it is determined whether an error is detected through checksum calculation for data packets continuously received from the transmitting mobile terminal, and it is checked whether the data packets are sequentially received. In addition, among the data packets continuously received, data packets with errors or data packets not sequentially received are registered in the retransmission list.

In a state where the reliability level is determined as the middle level, when the transmission of all data packets from the transmitting mobile terminal is completed, a retransmission of the data packets registered in the retransmission list is requested.

In the state where the reliability level is determined to be low level, if there is a data packet registered in the retransmission list, it indicates that data transmission has failed, and requests retransmission of all data packets.

Hereinafter, with reference to the accompanying drawings illustrating the present invention.

1 is a block diagram illustrating a configuration of a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 1, the mobile communication terminal 100 includes a wireless transceiver 110, a data processor 120, an OBEX communicator 130, an error detector 140, a controller 150, a memory 160, An input unit 170, a display unit 180, and an audio processor 190 are included.

The wireless transceiver 110 performs a communication function of the mobile communication terminal. The wireless transceiver 110 includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal.

The OBEX communication unit 130 performs data communication with a mobile communication terminal or a PC capable of OBEX communication. In the present embodiment, the control unit 150 transmits and receives the request and response packet and the data packet for setting the reliability level in the OBEX communication method.

The error detector 140 detects whether an error occurs in the data packet received through the OBEX communication unit 130 and transmits it to the controller 150.

The controller 150 generally controls the mobile communication terminal 100 and generates various request packets, response packets, data packets, and the like used for OBEX communication.

The memory unit 160 includes a program memory and data memories. Programs are stored in the program memory for controlling general operations of the mobile communication terminal 100.

In an embodiment of the present invention, the memory unit 160 stores a program that implements an infrared OBEX function that provides an object model representing a data object, a standard format for providing information about the object, and transmitting the object. The memory unit 160 also stores, in the retransmission list, the data packet in which an error occurs among the data packets received under the control of the controller 150.

The input unit 170 includes various buttons for inputting numeric and character information, function buttons for setting various functions, and the like. The input unit 170 may be implemented as a keypad including a direction key, a jog dial, a touch screen, a joystick, and the like. In an embodiment of the present invention, the input unit 170 transmits the reliability level input from the user to the control unit 150.

The display unit 180 outputs various display information and various menu screens output from the mobile communication terminal 100, and includes a liquid crystal display (LCD) or an organic light emitting diode (OLED). In addition, the display unit 180 may include two or more display devices, including an external display unit and an internal display unit.

In an embodiment of the present invention, the display unit 180 displays a menu screen for setting the reliability level so that the user can directly set the reliability level.

The audio processor 190 reproduces the audio signal decoded by the data processor 120 through the speaker SPK or transmits the audio signal generated from the microphone MIC to the data processor 120.

2 is a flowchart provided to explain an OBEX communication method of a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 2, first, a negotiation of a reliability level is performed between a transmitting mobile terminal and a receiving mobile terminal (S210). More specifically, as a result of negotiation of the reliability level, three negotiations are performed: high level, middle level, and low level.

Negotiation method transmits its desired level of reliability from the sending mobile terminal to the receiving side, and the receiving mobile terminal responds with the maximum level of reliability it can handle, and responds to the response of the receiving mobile terminal. The reliability level is determined by this.

When the negotiation of the reliability level is made at the high level, the transmitting mobile terminal and the receiving mobile terminal perform low-speed / high reliability OBEX communication (S220).

If the reliability level is negotiated at the middle level, the transmitting mobile communication terminal and the receiving mobile communication terminal perform high-speed / medium reliability OBEX communication (S230).

In addition, when the negotiation of the reliability level is made at a low level, the transmitter-side mobile communication terminal and the receiver-side mobile communication terminal perform high speed / low reliability OBEX communication (S240).

3 is a flowchart provided to explain an OBEX communication method of a mobile communication terminal when a reliability negotiation is performed at a high level according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating step S300 of FIG. 3 in more detail. .

Referring to FIG. 3, a reliability level is determined to be a high level by negotiation between a transmitting mobile communication terminal and a receiving mobile communication terminal (S300).

Referring to FIG. 4, the step S300 is described in more detail. When the reliability level is set to a high level in the transmitting mobile communication terminal 100a (S301), the transmitting side mobile communication terminal 100a indicates that the reliability level is a high level. The packet including the indicated class header 5 is transmitted to the receiving side mobile communication terminal 100b (S303).

At this time, the reliability level set in the transmitting-side mobile communication terminal 100a may be automatically set according to the type or importance of the transmission file, or may be set manually by setting the reliability level of the user.

When the receiving side mobile communication terminal 100b is able to communicate according to the reliability level set to the high level (S305: Y), the controller 150 of the receiving side mobile communication terminal 100b indicates that the class header indicates that the reliability level is high level. A response packet including (5) is generated (S307), and transmitted to the receiving-side mobile communication terminal 100b through the OBEX communication unit 130 (S309).

When the reliability levels set in the transmitting mobile communication terminal 100a and the receiving mobile communication terminal 100b are both high level, the reliability level is finally determined to be high level.

As such, when the reliability level is determined as the high level (S300), the transmitting mobile terminal 100a transmits the data packet to the receiving mobile terminal 100b through the OBEX communication unit 130 (S310).

FIG. 5A is a diagram illustrating a process of transmitting a data packet to a receiving mobile communication terminal by a transmitting mobile terminal and a process of receiving a mobile communication terminal responding thereto.

Referring to FIG. 5A, the control unit 150 of the transmitting-side mobile communication terminal 100a stores a data packet including a checksum header 10 for error detection and a packet number header 15 containing information about a packet number. It generates and transmits to the receiving side mobile communication terminal 100b through the OBEX communication unit 130 (S310).

At this time, since the data packet is actually the first packet including data among the packets transmitted from the transmitting mobile terminal 100a to the receiving mobile terminal 100b, the packet number header 15 included in the data packet is used. The field value is set to '1'.

The error detection unit 140 of the receiving side mobile communication terminal 100b calculates a checksum using data included in the data packet transmitted from the transmitting side mobile communication terminal 100a, and checks the information included in the checksum header 10. By comparison, it is determined whether an error occurs (S320).

5B is a diagram illustrating a packet transmission process between a transmitting mobile communication terminal and a receiving mobile communication terminal when an error occurs as a result of checksum calculation.

Referring to FIG. 5B, when an error occurs as a result of the checksum calculation of the second data packet, the receiving mobile communication terminal 100b requests retransmission of the second data packet. When the second data packet is retransmitted from the transmitting mobile communication terminal 100a and no error occurs as a result of the checksum calculation of the second data packet, the receiving mobile communication terminal 100b moves the 'OK' response packet to the transmitting side. Transmission to the communication terminal 100a.

In addition, the error detection unit 140 of the receiving side mobile communication terminal 100b sequentially transmits the data packets according to the packet number using the packet number header 15 of the data packet received from the transmitting side mobile communication terminal 100a. Check whether it is (S360).

5C is a diagram illustrating a packet transmission process between a transmitting mobile terminal and a receiving mobile terminal when data packets are not sequentially received according to packet numbers.

Referring to FIG. 5C, since '3' is set as a field value in the packet number header 15 of the second data packet and data packets are not sequentially received, the receiving side mobile communication terminal 100b receives the packet number header. The retransmission request packet including '2' as the field value of (15) is transmitted to the transmitting-side mobile communication terminal 100a.

When receiving the data packet having the field value '2' set in the packet number header 15 from the transmitting mobile terminal 100a, the receiving mobile terminal 100b sends an 'OK' response packet to the transmitting mobile terminal. Send to 100a.

When it is determined that an error occurs as a result of the checksum calculation in step S320 (S330: Y), or when it is determined that the data packet is not sequentially transmitted according to the packet number in step S360 (S370: N), the receiving side mobile communication The terminal 100b requests retransmission of the data packet to the transmitting-side mobile communication terminal 100a (S350 and S380).

 On the contrary, when it is determined that an error does not occur as a result of the checksum calculation in step S320 (S330: N), and when it is determined that data packets are sequentially transmitted according to the packet number in step S360 (S370: Y), the receiving side mobile communication The terminal 100b transmits an 'OK' response packet to the transmitting-side mobile communication terminal 100a to inform that the data packet is normally received (S340 and S390).

As such, when the reliability level is set to a high level and OBEX communication is performed, data processing is performed in a pair of a request and a response, so that problems occurring in the data processing process can be grasped in real time. There is an advantage that high reliability can be maintained by requiring retransmission.

Therefore, when the reliability level is determined to be high level, it is suitable for transmission of data that should not have a security file or data loss.

FIG. 6 is a flowchart provided to explain an OBEX communication method of a mobile communication terminal when reliability negotiation is performed at a middle level according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating step S600 in more detail.

Referring to FIG. 6, a reliability level is determined to be a middle level by negotiation of a reliability level between a transmitting mobile communication terminal and a receiving mobile communication terminal (S600).

Referring to FIG. 7, the step S600 will be described in detail. When the reliability level is set to a high level in the transmitting mobile communication terminal 100a, the transmitting side mobile communication terminal 100a uses a class header indicating that the reliability level is a high level. The packet including 5) is transmitted to the receiving-side mobile communication terminal 100b (S601).

In this case, the reliability level set by the transmitting-side mobile communication terminal 100a may be automatically set according to the type or importance of the transmission file, or manually by the user's reliability level setting.

If the receiving side mobile communication terminal 100b is not capable of communicating according to the reliability level set to the high level, but it is determined that the processing is possible at the middle level (S603: Y), the class header 5 indicating that the reliability level is the middle level is shown. Is generated (S605) and transmitted to the receiving side mobile communication terminal (100b) (S607).

The reliability level is thereby determined to be the middle level. In the above-described embodiment, when the transmitting-side mobile communication terminal 100a requests to set the reliability level to the high level, the receiving-side mobile communication terminal 100b does not respond, and the response packet includes the class header 5 of the middle level. Has been described in that the reliability level is determined to be the middle level when the transmission is transmitted to the transmitting-side mobile communication terminal 100a.

However, when the transmitting side mobile communication terminal 100a requests that the reliability level be set to the middle level, the receiving side mobile communication terminal 100b responds and sends the response packet including the class header 5 of the middle level in response. Even when transmitted to the communication terminal 100a, the reliability level is determined as the middle level.

When the reliability level is determined as the middle level, the transmitting mobile terminal 100a continuously transmits the data packet to the receiving mobile terminal 100b (S610), and the receiving mobile terminal 100b receives the receiving level. It is determined whether an error has occurred in one data packet, and the data packet in which the error has occurred is registered in the retransmission list of the memory unit 160 (S620).

8 is a view illustrating steps S610 and S620 in more detail. Referring to FIG. 8, since an error occurs in the second and third data packets among the n data packets continuously received from the transmitting mobile communication terminal, the receiving mobile communication terminal 100b may receive an error 2. The data packet 3 and the data packet 3 are registered in the retransmission list of the memory unit 160 (S620).

When the transmission of all data packets is completed (S630: Y), the receiving-side mobile communication terminal 100b requests retransmission for the data packets registered in the retransmission list (S640).

Referring to FIG. 8 again, the receiving mobile terminal 100b includes '2' and '3' as field values in the packet header to request retransmission of data packets 2 and 3 registered in the retransmission list. The retransmission request packet is transmitted to the transmitting side mobile communication terminal 100a.

Accordingly, when the second and third data packets are normally received from the transmitting mobile terminal 100a, the receiving mobile terminal 100b transmits an 'OK' response packet to the transmitting mobile terminal 100a. Signal that the packet was received successfully.

When reliability negotiation is made at the middle level as described above, OBEX communication has high speed and medium reliability. More specifically, when the reliability negotiation is made at the middle level, the transmitting mobile communication terminal continuously transmits the data packet under the assumption that there is no problem with the data packet transmitted to the receiving side. Therefore, higher speed communication is possible as compared with the high level of response processing for each data packet.

In addition, when all packet transmissions are completed, the receiving mobile communication terminal 100b transmits a retransmission request packet to the transmitting mobile communication terminal 100a, where the retransmission request packet includes the number of the data packet for which retransmission is required. And some degree of reliability can be maintained.

FIG. 9 is a flowchart provided to explain an OBEX communication method of a mobile communication terminal when negotiation of a reliability level is performed at a low level according to an embodiment of the present invention, and FIG.

Referring to FIG. 9, a reliability level is determined as a middle level by a reliability level negotiation between a transmitting mobile communication terminal and a receiving mobile communication terminal (S900).

Referring to FIG. 10 in more detail with reference to FIG. 10, when the reliability level is set to a high level in the transmitting mobile communication terminal 100a, the transmitting side mobile communication terminal 100a indicates a class header indicating that the reliability level is a high level. The packet (5) is transmitted to the receiving side mobile communication terminal 100b (S901).

In this case, the reliability level set by the transmitting-side mobile communication terminal 100a may be automatically set according to the type or importance of the transmission file, or manually by the user's reliability level setting.

Receiving side mobile communication terminal (100b) is not possible to communicate according to the reliability level set to the high level, even if the middle level processing is not possible, but if it is determined that the processing at a low level (S903: Y), the reliability level A response packet including the class header 5 indicating the low level is generated (S905), and transmitted to the receiving side mobile communication terminal (100b) (S907).

When the reliability level is determined as the low level as described above, the transmitting mobile terminal 100a continuously transmits the data packet to the receiving mobile terminal 100b (S910), and the receiving mobile terminal 100b It is determined whether an error has occurred in the received data packet, and the data packet in which the error has occurred is registered in the retransmission list of the memory unit 160 (S920).

Referring to FIG. 10 to be described in more detail step S910 and step S920, since the error occurs in the data packet 2 and 3 of the n data packets continuously received from the transmitting-side mobile communication terminal (100a). In addition, the receiving side mobile communication terminal 100b registers the second data packet and the third data packet in which an error occurs in the retransmission list of the memory unit 160.

When the transmission of all data packets is completed (S930: Y), the receiving mobile terminal 100b checks whether a data packet registered in the retransmission list of the memory unit 160 exists (S940).

If there is a data packet registered in the retransmission list (S940: Y), the receiving mobile communication terminal 100b transmits a 'FAIL' signal to the transmitting mobile communication terminal 100a indicating the transmission failure of the data packet ( S950).

The transmitting mobile terminal 100a receiving the 'FAIL' signal retransmits the data packet from the beginning. That is, the transmitting-side mobile communication terminal 100a does not retransmit only the data packet for which retransmission is requested as in the case of the middle level, but sequentially retransmits the data packet n times from the first data packet.

If there is no data packet registered in the retransmission list (S940: N), the receiving mobile communication terminal 100b transmits an 'OK' signal indicating the successful transmission of the data packet to the transmitting mobile communication terminal 100a. (S960).

As such, when the reliability level is negotiated to a low level, the OBEX communication has high speed and low reliability. That is, the transmitting side mobile communication terminal 100a continuously transmits the data packet under the assumption that the data packet transmitted to the receiving side is not a problem. Therefore, high-speed communication is possible as compared with the method of performing response processing for each data packet.

In addition, when the reliability level is negotiated to a low level, when all data packets have been transmitted, the receiving mobile communication terminal transmits a response packet. In this case, the response packet includes only information indicating the success or failure of the transmission, and thus the middle level. Faster communication can be maintained than in the case of.

Low-level OBEX communication is suitable when the physical layer is very reliable among large files.

In the above description of the preferred embodiment of the present invention, the present invention is not limited to the above-described specific embodiment, it is common in the art to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

As described above, according to an embodiment of the present invention, the reliability level is negotiated between the transmitting terminal and the receiving terminal based on the type or the importance of the transmission file, and each scheme is different depending on the negotiated reliability level. Perform OBEX communication. Therefore, there is an advantage that can solve two problems of high reliability and high speed communication required in the conventional OBEX communication.

Claims (10)

Determining a reliability level by any one of a high level, a middle level, or a low level by negotiation of a reliability level between a transmitting mobile communication terminal and a receiving mobile communication terminal; And And performing a data packet communication by varying a communication method according to a reliability level determined by the negotiation. The performing of the data packet communication may include: Determining whether the data packet is normally received, and registering a retransmission list when the reliability level is determined to be a middle level or a low level. The method of claim 1, wherein the data packet communication, A data communication method of a mobile communication terminal, characterized by OBEX (Object Exchange Protocol) communication. The method of claim 1, wherein determining the reliability level comprises: Receiving a packet including reliability level information set in the transmitting-side mobile communication terminal; And responding with a maximum reliability level that can be processed by the mobile terminal based on the reliability level information. delete The method of claim 1, wherein when the reliability level is determined to be a high level, And determining whether an error is detected through a checksum calculation for each data packet received from the transmitting mobile terminal, and checking whether the data packets are received sequentially. The method of claim 5, And a retransmission request for the data packet in real time when an error occurs in the received data packet or the data packet is not sequentially received. The method of claim 1, If the reliability level is determined to be a middle level or a low level, And determining whether an error has been detected through a checksum calculation on data packets continuously received from the transmitting mobile communication terminal, and checking whether the data packets are sequentially received. The method of claim 7, wherein The data communication method of the mobile communication terminal, characterized in that to register the data packet in error or the data packets not received sequentially in the retransmission list of the consecutively received data packets. The method according to claim 8, wherein in the state where the reliability level is determined as the middle level, Requesting retransmission of the data packet registered in the retransmission list when the transmission of all data packets from the transmitting mobile terminal is completed. The method of claim 8, wherein in a state where the reliability level is determined to be a low level, And a data packet registered in the retransmission list, notifying that data transmission has failed, and requesting retransmission of all data packets.

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