KR101336032B1 - Method for transmitting and receiving of file in local area communication and thereof commucation terminal - Google Patents

Abstract

The present invention provides a file transmission / reception method between a first communication terminal and a second communication terminal through short-range communication, wherein the first communication terminal generates a file request packet according to an OPP and transmits the file request packet to the second communication terminal. When a file request packet is received in the communication terminal, the value of the first byte of the packet is checked. If the value indicates an OP code by the OPP, it is determined whether a name header exists in the packet. Extracting a file corresponding to a file name included in a packet and transmitting it to the first communication terminal, the simple process of requesting and receiving one file between communication terminals using Bluetooth can use the OPP without using Bluetooth FTP. .

Near field communication, Bluetooth, OPP

Description

TECHNICAL FIELD [0002] Method for transmitting and receiving of file in local area communication and pretty commucation terminal}

The present invention relates to a file transmission / reception method through short-range communication and a communication terminal thereof, and more particularly, to generate a file request packet according to an object push profile (OPP) in a first communication terminal and transmit the file request packet to the second communication terminal. If the second communication terminal checks the value of the first byte of the file request packet and indicates that the value indicates the OP code by the OPP, it is determined whether a name header exists in the packet. The present invention relates to a method for transmitting and receiving a file through short-range communication for extracting a file corresponding to an included file name and transmitting the file to the first communication terminal.

With the recent development of communication technology and the spread of personal computers (PCs), most users use at least mobile communication terminals and personal computers, and the use of mobile communication terminals and personal computers is increasing. So, if you are an office worker, you sit in front of the computer for work and if you are a student.

On the other hand, due to the development of communication technology, the mobile communication terminal and the personal computer are connected to the mobile communication terminal and the computer via Bluetooth, which is a short-range communication relay device, to enable data communication for exchanging bell / melody and image data.

At home, I use a wireless mouse and a printer, and I use a wireless device with a simple connection using a portable device. Wireless communication is increasingly becoming a necessity beyond convenience. And at the heart of it is a technology called "Bluetooth."

Bluetooth technology is a small, low cost, low power consumption of less than 100mW is a technology that provides a wireless environment by mounting a short-range transmitter in a mobile device.

The Bluetooth FTP standard is used to transfer files between communication terminals via Bluetooth, and the OPP standard is used when exchanging objects such as business cards, address books, and schedules.

1 is a flowchart illustrating a method of exchanging an object according to a conventional OPP standard, and FIG. 2 is an exemplary view showing a business card request packet according to a conventional OPP standard.

Referring to FIG. 1, after the first communication terminal and the second communication terminal are connected through Bluetooth (S100), when the first communication terminal wants to receive an object from the second communication terminal through the OPP, the first communication terminal may receive the object. 2 The object request packet is transmitted to the communication terminal (S102).

The object request packet is a packet indicating that an object of a specific format is requested. For example, a business card request packet will be described with reference to FIG. 2.

2 shows a business card request packet, which includes a business card request opcode, packet length, payment required, header type length, object format, and header end.

The 0x83 value of the first byte is an opcode requesting a business card, and 0x42 of the 4th byte represents a header requesting one vCard format.

Upon receiving the object request packet, the second communication terminal confirms that it is an opcode by the OPP using the first byte of the object request packet (S104).

That is, the second communication terminal checks the opcode value corresponding to the first byte of the object request packet and determines that the packet is an OPP standard packet.

Then, the second communication terminal extracts an object corresponding to the format displayed in the object format area of the packet (S106), and transmits it to the first communication terminal (S108).

OPP is a standard that allows you to send and receive objects such as business cards, address books, messages, schedules, and notes. In the OPP specification itself, there is no function for specifying a file name and requesting only one object of a certain format. If there is an object of the corresponding format in the requested OPP server, it is pushed. Otherwise, an error message is transmitted.

However, in the case of the conventional Bluetooth communication as described above, there is a disadvantage that a complicated and many contents of the FTP standard must be followed when one file is to be transmitted.

Accordingly, an object of the present invention is to provide a method for transmitting and receiving files through short-range communication that can use OPP without using Bluetooth FTP in the case of a simple process of requesting and receiving a file between communication terminals using Bluetooth. .

Another object of the present invention is to provide a method for transmitting and receiving a file through short-range communication and a communication terminal for allowing a corresponding communication terminal to push a corresponding file by transmitting a file name by extending a request packet in the OPP standard.

It is still another object of the present invention to easily implement a Bluetooth device with a file transfer function by allowing a simple processor to request and receive a file so that it can be implemented using the OPP standard without having to implement all of the complicated and large FTP specifications. The present invention provides a method for transmitting and receiving files through short-range communication and a communication terminal thereof.

According to an aspect of the present invention to achieve the above object, in the method of transmitting and receiving files between the first communication terminal and the second communication terminal through the short-range communication, by generating a file request packet according to the OPP in the first communication terminal Transmitting to a second communication terminal, when a file request packet is received at the second communication terminal, checking a value of the first byte of the packet and determining whether a name header exists in the packet if the value indicates an OP code by an OPP. And if it is determined that the name header exists, extracting a file corresponding to the file name included in the packet and transmitting the file to the first communication terminal. .

The file request packet according to the OPP includes an OPcode display unit, a packet length display unit, a name header display unit, a file name length display unit, a file name display unit, and a file name end display unit.

The name header display unit is an area indicating that the packet is a packet requesting a file, and the file name length display unit is an area indicating the lengths between the file name display unit and the file name end display unit, and the file name displayed on the file name display unit is Unicode. Is indicated by).

According to another aspect of the present invention, in a method for transmitting a file through short-range communication by a communication terminal, (a) when a file request packet is received, checking a first byte value of the packet, (b) (a) If the first byte value indicates the OP code by the OPP, determining whether a name header exists in the packet; and (c) if the name header exists, the packet is included in the packet. Checking the confirmed file name, and extracting and transmitting a file corresponding to the confirmed file name is provided a file transmission method through short-range communication.

If the first byte value of the check result of step (a) does not indicate the OP code by the OPP, determining that the file request packet by the FTP and extracting and transmitting the corresponding file further comprising a short-range communication through A file transmission method is provided.

If the name header does not exist as a result of the determination in step (b), extracting and transmitting an object corresponding to the format indicated in the packet is provided.

According to another aspect of the present invention, in a communication terminal provided with an input unit, a display unit, and a storage unit, a short-range communication unit for communication with a counterpart terminal, a first byte value of a file request packet received through the short-range communication unit is determined by the OPP. When the OP code is indicated, it is determined whether a name header exists in the packet, and when it is determined that a name header exists, a file extraction request message including a file name included in the packet is generated and transmitted to the file / object extraction unit. When the file extraction request message is received from the packet analysis unit, the analyzer includes a file / object extraction unit for extracting a file corresponding to the file name from the storage unit to be transmitted through the local area communication unit; There is provided a communication terminal for file transmission and reception through the.

If there is no name header in the packet, the packet analyzer transmits an object extraction request message to the file / object extraction unit.

When the object extraction request message is received from the packet analyzer, the file / object extractor extracts an object corresponding to an object format included in the message and transmits the object through the short range communication unit.

If a file request command by the OPP is input from the user, further comprising a packet generation unit for generating a file request packet consisting of an OPcode display unit, packet length display unit, name header display unit, file name length display unit, file name display unit, file name end display unit Provided is a communication terminal for file transmission and reception through short-range communication.

As described above, according to the present invention, in the case of a simple process of requesting and receiving a file between communication terminals using Bluetooth, there is provided a file transmission / reception method through short-range communication that can use OPP without using Bluetooth FTP and a communication terminal thereof. can do.

In addition, a simple processor that requests and receives a file can be implemented using the OPP specification without having to implement all the complicated and large FTP specifications. A transmission / reception method and a communication terminal thereof can be provided.

The foregoing and other objects, features, and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

3 is a diagram illustrating a local area network using Bluetooth according to the present invention.

Referring to FIG. 3, Bluetooth is a wireless connection within a short distance (10m to 100m) between a portable communication device such as a mobile communication terminal, a portable PC, a PDA, network access points, and other peripheral devices. Technical Specification for Radio Link, 2.4GHs ISM Open Band).

Bluetooth aims to be installed in all communication terminals used in homes and offices, and can be connected to any wired / wireless network by forming a wireless network (Wireless Piconet, Ad Hoc Scatternet, etc.).

Therefore, when a wireless network using Bluetooth is completed, free data exchange is possible between all communication terminals (particularly, notebooks, PDAs, and mobile communication terminals). When the Internet bridge is configured, the desktop computers are currently reached through optical cables, ADSL, modems, and the like. The internet information is finally reached to the user's hand.

Although all Bluetooth devices are identical in hardware, they operate as a master or slave depending on the situation, and they constitute a minimum unit of piconet. The Bluetooth device which initially initiated communication becomes a master and communicates with a slave in the piconet. At this time, communication in the piconet is managed by the master.

The Bluetooth Specification is a de facto standard that contains the information required to enable various devices using Bluetooth wireless technology to communicate with each other anywhere in the world. The specifications are largely divided into two parts: a core specification describing a physical part and firmware required for the physical part, and a profile prepared for compatibility between devices.

The core part may include radio frequency (RF), baseband, link manager, service discovery protocol (SDP), transport layer, and other communication protocols. It specifies the interoperability with.

The Profiles section covers the protocols and procedures required for many different types of Bluetooth applications. Detailed description of the profile will be made with reference to FIG. 4.

4 is a view showing a Bluetooth profile according to the present invention.

Referring to FIG. 4, a Bluetooth profile is a standard defining how to use Bluetooth in a top-level application.

The Generic Access Profile (GAP) defines the basic elements for discovering or establishing a connection between Bluetooth devices, and the SDP (Service Discovery Protocol) is a protocol that deals with setting up / discovering services on top of the Bluetooth stack.

The TCS Binary (Telephone Control Protocol Specification Binary), which includes Cordless Telephony and Intercom, is a protocol for implementing radiotelephone functions in Bluetooth, and defines call control signals for establishing voice or call data between Bluetooth devices.

SPP (Serial Port Profile) defines the procedure for establishing a serial cable connection between peers of a Bluetooth device using RFCOMM, and HSP (Headset Profile) defines the procedure for using the headset function between a Bluetooth device and a cell phone. do.

LAN Access Profile (LAP) supports LAN access using Point-to-Point Protocol (PPP).

The Generic Object Exchange Profile (GOEP) contains procedures for supporting models using OBEX.

File Transfer Profile (FTP) supports data transfer or processing of objects between Bluetooth devices, and Object Push Profile (OPP) supports small data volume exchanges such as vCards.

PAN (Personal Area Networking Profile) supports standard IP based network service through Bluetooth transport layer.

5 is a block diagram schematically showing the configuration of a communication terminal capable of file transfer using the OPP standard according to the present invention.

Referring to FIG. 5, a communication terminal 500 capable of file transfer using an OPP standard includes a short range communication unit 502, a packet analyzer 504, a storage unit 506 storing various data, and a file / object extraction unit. 508, an input unit 510 for receiving a user command, and a display unit 512 for receiving and displaying key data and various information signals generated by the input unit 510.

The short range communication unit 502 refers to Bluetooth, infrared communication, or the like, and enables short range communication with other communication terminals.

When the packet analysis unit 504 receives the file request packet through the local area communication unit 502, the packet analysis unit 504 analyzes the packet to determine whether the first byte value is an OP code by the OPP, and determines that the OP code by the OPP. If so, it is determined whether a name header exists in the packet.

As a result of the determination, if a name header exists in the packet, the packet analyzer 504 transmits a file extraction request message to the file / object extractor 508. The file extraction request message includes a file name included in the packet.

In addition, if there is no name header in the packet, the packet analyzer 504 transmits an object extraction request message to the file / object extractor 508.

That is, if the name header does not exist in the packet, the packet analyzer 504 determines that the packet is an object request packet by the existing OPP and transmits an object extraction request message to the file / object extractor 508. The object extraction request message includes the object format indicated in the packet.

When the file / object extraction unit 508 receives a file extraction request message from the packet analyzer 504, the file / object extractor 508 extracts a file corresponding to a file name included in the message from the storage unit 506 and performs the short-range communication unit ( 502 is transmitted to the counterpart terminal.

In addition, when the file / object extractor 508 receives an object extraction request message from the packet analyzer 504, the file / object extractor 508 extracts an object corresponding to an object format included in the message from the storage unit 506. It is transmitted to the counterpart terminal through the short range communication unit 502.

According to another embodiment of the present invention, the communication terminal 500 may include a packet generator (not shown) for generating a corresponding file request packet according to the command when a file request command by an OPP is input from a user. have.

The file request packet generated by the OPP generated by the packet generator (not shown) may include an OPcode display unit, a packet length display unit, a name header display unit, a file name length display unit, a file name display unit, and a file name end display unit as shown in FIG. 8. The detailed description thereof will be made with reference to FIG. 8.

The communication terminal performing the above role refers to a mobile communication terminal, a wired communication terminal and the like.

6 is a flowchart illustrating a file transmission / reception method using Bluetooth communication between communication terminals according to the present invention.

Referring to FIG. 6, the first communication terminal and the second communication terminal are connected to each other via Bluetooth to enable mutual data exchange (S600).

That is, the first communication terminal and the second communication terminal set a serial port profile (SPP), a handsfree profile / headset profile (HFP / HSP), and an object push profile (OPP). Here, the setting procedure of the protocol is one example, and there is no provision that any protocol should be set first.

After the Bluetooth communication is established between the first communication terminal and the second communication terminal as in S600, if the first communication terminal wants a file stored in the second communication terminal, the first communication terminal requests the file using the OPP. Can be.

Then, the first communication terminal generates a file request packet according to the OPP standard and transmits it to the second communication terminal (S602).

Then, the second communication terminal checks whether the corresponding packet is an OP code by the OPP using the first byte of the packet transmitted from the first communication terminal (S604).

That is, since OP code information is displayed in the first byte of the OPP standard, the second communication terminal can confirm that the packet is based on the OPP standard using the OP code information displayed in the first byte.

If it is confirmed in S604 that the OP code is determined by the OPP, the communication terminal determines whether a name header exists in the received packet (S606).

If it is determined in S606 that the name header exists in the packet, the second communication terminal extracts the file and transmits the file to the first communication terminal (S608 and S610).

If the name header does not exist in the corresponding packet as a result of the determination of S606, the second communication terminal extracts an object of the corresponding format and transmits the object to the first communication terminal (S612).

In the above description, only the second communication terminal analyzes the packet and transmits the corresponding file. However, the first communication terminal may also operate in the same manner as the second communication terminal.

7 is a flowchart illustrating a file extraction and transmission method using an OPP according to the present invention.

Referring to FIG. 7, when a file request packet is received through Bluetooth (S700), the communication terminal analyzes the received packet (S702), and determines whether the first byte value of the packet is an OP code by the OPP (S700). S704).

That is, when a file request packet is received, the communication terminal checks the first byte value of the packet to determine whether the packet is a file request packet by OPP or FTP.

As a result of the determination in S704, if the first byte value is an OP code by OPP, the communication terminal determines whether a name header exists in the packet (S706).

As a result of the determination of S706, if a name header exists in the packet, the communication terminal checks the file name displayed in the packet (S708), and extracts a file corresponding to the confirmed file name (S710).

In other words, if a name header exists in the received packet, the communication terminal indicates that the packet requests file transfer. Therefore, the communication terminal checks the file name indicated in the packet and extracts a file corresponding to the checked file name.

Then, the communication terminal transmits the extracted file to the counterpart terminal via Bluetooth (S712).

If the name header does not exist in the packet as a result of the determination of S706, the communication terminal extracts an object of a corresponding format and transmits it to the counterpart terminal (S714). That is, if the name header does not exist in the received packet, the communication terminal determines that the object request packet is an existing OPP packet, and extracts the object indicated in the packet and transmits it to the counterpart terminal.

If it is determined in step 704 that the first byte value of the packet does not indicate an OP code by the OPP, the communication terminal determines that the file is a packet request packet by FTP, extracts the corresponding file, and transmits the file to the counterpart terminal (S716). .

8 is a view showing the structure of a file request packet according to the OPP according to the present invention, Figure 9 is an exemplary view showing a file request packet using the OPP according to the present invention.

8 and 9, the file request packet 800 according to the OPP includes an OPcode display unit 802, a packet length display unit 804, a name header display unit 806, a file name length display unit 808, and a file name display unit 810. ), The file name end display unit 812 is included.

The OPcode display unit 802 is an area indicating that the packet is an OPP standard. For example, when the value of the OP code display unit 802 is 0 × 83, it can be seen that the OPP standard is a business card request op code. .

The packet length display unit 804 is an area indicating the total length of the packet, and the name header display unit 806 is an area indicating that the packet is a packet requesting a file.

That is, '0x01' shown in the fourth byte of the name header display unit 806 is a header for requesting a file corresponding to a file name that follows.

The file name length display unit 808 is an area indicating the length of the file name and the file name end unit, and the file name end display unit 812 is an area indicating the end of the file name.

The two bytes (5th and 6th bytes) corresponding to the filename length display unit 808 record the length from the fourth byte to the filename end character according to the existing OPP standard.

Considering only the case of the present invention, it is not necessary to display the length (5th, 6th byte) corresponding to the header again after the Name Header display unit 806. However, the reason for displaying this is to consider the compatibility with the existing OPP specification.

This is because in the existing OPP standard, a plurality of headers may appear after the OP code display unit (first byte) 802 and the length of each header may be displayed to allow parsing on the receiving side.

In addition, the file name end display unit 812 indicates that two file names of 0x00 exist to end the file name.

The file name display unit 810 is an area for displaying information on the requested file name, and the file name is displayed in unicode. This is because Unicode is always used when displaying file names in the Bluetooth standard.

In addition, since the file name displayed on the file name display unit 810 is sent in two bytes according to the OPP standard, two bytes are allocated to each character.

For example, if the file name is' shin.vcf ', the file name contains 0x00 and 0x53 as' s', 0x00 and 0x68 as' h', 0x00 and 0x69 as' i ', 0x00 and 0x6e is' n', 0x00 and 0x2e is'. ', 0x00 and 0x76 is' v', 0x00 and 0x63 is' c ' , 0 × 00 and 0 × 66 may be represented by 'f'.

By using the method proposed in the present invention, it is possible to implement a file transfer using the OPP standard simply without the need to implement a complex and heavy standard such as FTP.

In the above embodiment, although Bluetooth has been described as an example of near field communication, the present invention may be applied to all near field communication other than Bluetooth.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the file transmission / reception method through the short-range communication and the communication terminal according to the present invention do not need to implement all of the complicated and many FTP specifications in the case of a simple processor requesting and receiving a file between communication terminals using the short-range communication. It can be applied to a technology that facilitates file transmission and reception using the OPP standard.

1 is a flowchart illustrating a method of exchanging an object according to a conventional OPP standard.

2 is an exemplary view showing a business card request packet according to a conventional OPP standard.

3 is a diagram illustrating a local area network using Bluetooth according to the present invention;

4 shows a Bluetooth profile according to the invention.

5 is a block diagram schematically showing the configuration of a communication terminal capable of file transfer using the OPP standard according to the present invention.

6 is a flowchart illustrating a file transmission / reception method using Bluetooth communication between communication terminals according to the present invention.

7 is a flowchart illustrating a file extraction and transmission method using OPP according to the present invention.

8 illustrates a structure of a file request packet according to an OPP according to the present invention.

9 is an exemplary view showing a file request packet using an OPP according to the present invention.

<Explanation of symbols for the main parts of the drawings>

500: communication terminal 502: short-range communication unit

504: packet analysis unit 506: storage unit

508: file / object extraction unit 510: input unit

512: display unit

Claims (13)

In the file communication method between the first communication terminal and the second communication terminal through the short-range communication, Generating, by the first communication terminal, a file request packet according to the OPP to the second communication terminal; When the file request packet is received at the second communication terminal, the value of the first byte of the packet is checked. When the value indicates the OP code by the OPP, it is determined whether a name header exists in the packet, and it is determined that the name header exists. Extracting a file corresponding to a file name included in the packet and transmitting the extracted file to the first communication terminal; Including, If the first byte of the packet does not indicate the OP code, the second communication terminal further comprises the step of determining that the file request packet by the FTP to extract the corresponding file and transmits to the first communication terminal File transmission and reception method through local area communication. The method of claim 1, The file request packet according to the OPP comprises an OPcode display unit, a packet length display unit, a name header display unit, a file name length display unit, a file name display unit, and a file name end display unit. 3. The method of claim 2, And the name header display unit is an area indicating that the corresponding packet is a packet requesting a file. 3. The method of claim 2, And the file name length display unit is an area indicating a length between the file name display unit and the file name end display unit. 3. The method of claim 2, And a file name displayed on the file name display unit is displayed in unicode. The method of claim 1, And a first byte of the packet is an OPcode display unit. In the method for the communication terminal to transmit a file via short-range communication, (a) if a file request packet is received, checking a first byte value of the packet; (b) if the first byte value indicates an OP code by the OPP as a result of the checking of step (a), determining whether a name header exists in the packet; and (c) checking the file name included in the packet if the name header exists as a result of the determination of step (b), extracting and transmitting a file corresponding to the checked file name; Including, If the first byte value of the check result of step (a) does not indicate the OP code by the OPP, determining that the file request packet by the FTP and extracting and transmitting the corresponding file further comprising a short-range communication through How to send a file. delete The method of claim 7, wherein And if the name header does not exist as a result of the determination in step (b), extracting and transmitting an object corresponding to the format indicated by the packet. In a communication terminal provided with an input unit, a display unit and a storage unit, A short range communication unit for communicating with a counterpart terminal; If the first byte value of the file request packet received through the local area communication unit indicates an OP code by the OPP, it is determined whether a name header exists in the packet, and if it is determined that the name header exists, the file name included in the packet is included. A packet analysis unit generating a file extraction request message to be transmitted to the file / object extraction unit; A file / object extraction unit for receiving a file extraction request message from the packet analyzer and extracting a file corresponding to the file name from a storage unit to be transmitted through the local area communication unit; Including, And if the first byte value does not indicate an OP code, determine that the file is a file request packet by FTP, extract the file, and transmit the file to the counterpart terminal. The method of claim 10, And the packet analyzer transmits an object extraction request message to the file / object extracting unit if the name header does not exist in the packet. The method of claim 10, When the file / object extractor receives an object extraction request message from the packet analyzer, the file / object extractor extracts an object corresponding to an object format included in the message and transmits the object through the short range communication unit. Communication terminal for transmitting and receiving. The method of claim 10, When the file request command by the OPP is input from the user, further comprising a packet generation unit for generating a file request packet consisting of an OPcode display unit, packet length display unit, name header display unit, file name length display unit, file name display unit, file name end display unit Communication terminal for file transmission and reception through the near field communication.

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