KR100704693B1 - Method and system for providing of Bluetooth service using by tunneling function of BTAPBluetooth Access point - Google Patents

Abstract

Provided are a method and a system for providing a wireless service using a tunneling function of a Bluetooth access point. A wireless service system according to an exemplary embodiment of the present invention may include a first wireless terminal including an AP mode application and a direct mode application, which may be connected to a wired network through an access point, and instructs direct printing on embedded content. A second wireless terminal including an application for providing a direct printing service to the wireless terminal, and direct printing service related messages exchanged between the first wireless terminal and the second wireless terminal by converting a parameter included in the messages; It includes an access point that tunnels messages.

Bluetooth Access Point (BTAP), AP-mode Service, Direct-mode Service, Tunneling Function, Direct Photo Printing

Description

Method and system for providing of Bluetooth service using by tunneling function of Bluetooth access point (BTAP)

1A, 1B, and 1C illustrate a link and network structure between Bluetooth terminals.

2A illustrates an AP mode service of a conventional Bluetooth system.

2B illustrates a direct mode service of a conventional Bluetooth system.

Figure 3 shows the overall configuration of a Bluetooth system according to an embodiment of the present invention.

4 illustrates a protocol stack structure of terminals in a Bluetooth system according to an embodiment of the present invention.

5 shows a management table in an access point according to an embodiment of the invention.

6 shows a logical block diagram of terminals in a Bluetooth system according to an embodiment of the present invention.

7 is a conceptual diagram illustrating a process in which a message for a direct mode service between a first wireless terminal and a second wireless terminal is tunneled through an access point according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

300: camera phone 310: printer

320: Bluetooth access point 460: Tunneling management unit

640: management table

The present invention relates to a method and a system for providing a wireless service, and more particularly, by allowing a direct mode service message exchanged between a first wireless terminal and a second wireless terminal to be tunneled using a Bluetooth access point, thereby allowing the AP to access the AP in the first wireless terminal. The present invention relates to a method and a system therefor that can simultaneously use a mode service and a direct mode service.

Bluetooth is a low-cost, low-power wireless solution designed to wirelessly replace the cable that connects cell phones and their peripherals. It is a working group under the SIG and SIG. As the development of Bluetooth technology is jointly progressed, it is gradually becoming a standard for short-range wireless interface, and application scenarios between various digital devices as well as mobile phones and peripherals are possible, and thus foresee changes in daily life. Doing.

Looking at the link and network between Bluetooth terminals, Bluetooth establishes a link in a master-slave manner. Up to seven slaves are connected to one master, which is called a piconet. You can configure the network. When several piconets are gathered, as shown in FIG. 1C, a large hierarchical network is formed. Such a network is called a scatternet.

The master acts like a base station inside a piconet. By default, Bluetooth hopping 1600 times per second using frequency hopping. When a slave located outside of the piconet joins the piconet, the slave is synchronized to the master's clock to determine the hopping sequence. Communication can be performed according to the hopping sequence. The hopping sequence determined by the master is an appointment between the master and the slave. Therefore, if the slave is not synchronized with the master and cannot follow the hopping sequence of the master, the channel between the master and the slave is misaligned and cannot communicate normally. Since Bluetooth uses this frequency hopping scheme, interference with Bluetooth terminals not participating in the piconet or terminals using the same frequency band as Bluetooth, such as WLAN (IEEE802.11b), can be avoided. In addition, the slave inside the piconet cannot communicate with other slaves directly, but can always communicate with other slaves through the master. To this end, the master manages the connection state of slaves in the piconet in four states: Active, Sniff, Hold, and Park, so that all communication is done through the master.

The piconet may be divided into two types: a single slave piconet as shown in FIG. 1A and a multi-slave piconet as shown in FIG. 1B. The single slave piconet is related to the direct mode service, which will be described later in the form of direct communication between the master 100 and the slave 110 because one master 100 and one slave 110 exist. In addition, the multi-slave piconet means that there are a plurality of slaves 110, 120, and 130 with respect to one master 100, so that all communication is performed through the master 100.

As mentioned above, the type of Bluetooth service currently provided is largely the direct mode in which direct communication is performed between two Bluetooth terminals, such as an AP mode service using a Bluetooth access point such as Three in One Phone and direct printing. It is divided into two types of services.

Here, Three in One Phone means that a mobile phone can be used for three purposes by embedding a Bluetooth chip in the mobile phone. As shown in FIG. 2A, one mobile phone 200 is used outdoors. It can be used as a wireless phone in the home, the access point 210 is installed, and can be used as an intercom in the office. In other words, when a user calls from a mobile phone 200 having a Bluetooth chip embedded therein, the mobile phone is connected to a mobile phone network 240 through a code division multiple access (CDMA) scheme as a general mobile phone. When the user is talking to the mobile phone in the home where the Bluetooth access point 210 is installed, the mobile phone may be connected to the wired telephone network 230 through the Bluetooth access point and used as a wireless telephone. In this case, since the wired network fee is used, the telephone fee can be saved.

As shown in FIG. 2B, direct printing refers to an image output terminal such as a printer 260 without image information taken through an image capturing terminal 200 such as a camera phone or a digital camera without passing through a PC. It means to output directly. In the case of direct printing, the image capturing terminal 200 is set as a master, and the image output terminal 260 is set as a slave to directly communicate between the two terminals.

Conventionally, Bluetooth terminals have been developed to support only one of AP mode and direct mode services, but recently, as the needs of consumers gradually increase, the necessity of a Bluetooth terminal providing both AP mode and direct mode services is emerging. . However, as shown in FIGS. 2A and 2B, a conventional Bluetooth system supporting only one of AP mode service and direct mode service cannot be used simultaneously by simply placing the same Bluetooth within the same piconet. there was. In addition, even in the case of a Bluetooth terminal that supports both AP mode service and direct mode service, the AP mode service and the direct mode service cannot be used at the same time because the access point is set as a slave to the access point in the piconet set as the master. There is a problem.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and in a piconet using a Bluetooth access point as a master, the AP mode service and the direct mode service can be simultaneously used in a slave terminal using the tunneling function of the Bluetooth access point. The purpose is to provide a system for this.

However, the object of the present invention is not limited to the above-mentioned object, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a wireless service system according to an exemplary embodiment of the present invention may include an AP mode application and a direct mode application, which may be connected to a wired network through an access point, and instructs direct printing on embedded content. The messages include a wireless terminal, a second wireless terminal including an application for providing a direct printing service to the first wireless terminal, and direct printing service related messages exchanged between the first wireless terminal and the second wireless terminal. An access point tunnels the messages through the conversion of parameters.

In addition, the wireless service providing method according to an embodiment of the present invention to achieve the above object, including an AP mode application and a direct mode application can be connected to the wired network through an access point, and instructs the direct printing of the embedded content Establishing a first wireless channel with a first wireless terminal and assigning values for a sender connection ID and a receiver connection ID for the first wireless channel, wherein the access point is a direct service to the first wireless terminal; Forming a second wireless channel with a second wireless terminal including an application providing a second terminal, and assigning values for a transmission side connection ID and a reception side connection ID for the second wireless channel, and tunneling the access point; The management unit sends a connection on the first radio channel to the first wireless channel. Generating a management table including a digital signal value, a receiving side connection ID value, a transmitting side connection ID value and a receiving side connection ID value for the second wireless channel, and a first wireless terminal according to the contents of the management table. Tunneling the message through conversion of a parameter included in a direct printing related message exchanged between second wireless terminals.

Specific details of other embodiments are included in the detailed description and drawings, and the advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete and common knowledge in the technical field to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 3 schematically illustrates an overall configuration of a wireless service system that can simultaneously use an AP mode service and a direct mode service in a first wireless terminal according to an embodiment of the present invention. In a wireless service system according to an exemplary embodiment of the present invention, a first wireless terminal 300 supporting both an AP mode service and a direct mode, a second wireless terminal 310 supporting a direct mode service, a first wireless terminal and a second wireless terminal are provided. When the direct mode service is provided between the wireless terminals, the access point 320 tunnels a direct mode service related message exchanged between the first wireless terminal and the second wireless terminal. Here, the access point is set as a master, and the first wireless terminal and the second wireless terminal are set as slaves to the access point.

For example, the first wireless terminal corresponds to an image photographing terminal such as a camera phone or a digital camera, and the second wireless terminal corresponds to, for example, an image output terminal such as a printer. Hereinafter, a case in which the first wireless terminal is a camera phone with a built-in Bluetooth module and the second wireless terminal is a printer with a built-in Bluetooth module will be described.

First, the camera phone 310 preferably supports both the AP mode service and the direct mode service to enable the present invention. In this case, the user may use the direct mode service while using the AP mode service through the camera phone 310. In other words, when the camera phone 300, which is located outside the piconet where the access point 320 exists, enters the piconet in which the access point 320 is set as the master, the hopping of the master access point 320 is performed. It is synchronized to the sequence and is in a state capable of being used in connection with the wired telephone network 230 through the access point 320. At the same time, the application stored in the camera phone 300 may be output to the printer 320 by executing an application related to direct printing on the camera phone 300.

Next, FIG. 4 illustrates a protocol stack structure for each terminal in a Bluetooth system according to an embodiment of the present invention. Referring to Figure 4 describes the basic protocol of Bluetooth and the protocol stack structure of each terminal according to the present invention.

First, a protocol stack is a set of protocols in which each protocol is stacked from a lower layer to a higher layer. A host that is a lower layer than an HCI based on a host controller interface (HCI) is usually used. It is divided into a host controller protocol and a host protocol that is higher layer than the HCI. The host controller refers to a Bluetooth module, and the host refers to a place connected to a Bluetooth module, which is a host controller, to control the Bluetooth module and perform an application.

When the protocol is distributed based on HCI according to a general method, the host controller includes protocols such as baseband, RF, and link manager (LM), and the host includes logical link control and application protocols ( Logical Link Control and Adaptation Protoco (L2CAP), Radio Frequency Communication (RFCOMM), Service Discovery Protocol (SDP), TCS, Object Exchange Protocol (OBEX), etc. Included.

However, the protocol included in the host varies depending on the type of application or the type of the host. In the preferred embodiment of the present invention, when the camera phone having a small amount of resources allocated to the Bluetooth protocol stack is the host, the RF 402 may include: The protocol stack is distributed such that baseband 404, LM 406, L2CAP 408, RFCOMM 434, OBEX 432, SDP 450, and the like are included in the host controller.

Baseband (404) is the most essential protocol of Bluetooth, and serves to define and generate standard packets according to radio channel setup, link setup for packet exchange, piconet setup, and type of link.

The link manager 406 is a protocol for establishing and managing a link using an LMP message. When the processing related to link establishment and management is performed in the baseband 404, the link manager 406 wirelessly sends a packet to a remote device. It delivers the baseband processing results to other devices, and is notified of the transmission results to actually set up and manage the link. At this time, the LMP message is not transmitted to the upper layer of the link manager, but is transmitted and received only between the link managers of the two devices.

The L2CAP 408 is a kind of link layer. The L2CAP 408 transfers data transmitted from a lower layer of the L2CAP 408 to a higher layer of the L2CAP 408, or transmits data transferred from an upper layer protocol or an application of the L2CAP 408. 408 serves to deliver to the lower layers. In the L2CAP, when the length of a packet transmitted by an application or an upper layer protocol is long, segment the delivered packet into a limited length, or conversely, when the packet is divided into several pieces in the baseband 404, the L2CAP ( The packet management is also performed such as resembly the divided packets before delivery to the higher layer protocol or the application of 408.

SDP 450 is a protocol for exchanging information regarding what services are available in other Bluetooth devices present in the piconet and the characteristics of the available services. The SDP 450 has a server-client structure. The server device includes a list of services that can be provided by the server device and a detailed information on each service. The client device includes information related to services from the SDP of the server device. Can be obtained.

RFCOMM 434 is a protocol that emulates an RS-232 9-pin serial port, and can be said to be the most basic protocol in a Bluetooth application for wirelessizing signal lines such as RS232 cables.

In the protocol stack as described above, protocols such as RF 402, baseband 404, and LM 406 are included in the Bluetooth module in the form of firmware, and each protocol is a peer-to-peer scheme. Remotely communicates with a protocol within another Bluetooth device.

In addition to the above protocol stack structure, the protocol stack of the camera phone 300 according to an embodiment of the present invention further includes an AP mode profile 410 associated with an AP mode service and a direct mode profile 430 associated with a direct mode service. It is desirable to be. The AP mode profile 410 includes protocols and profiles required to implement AP mode services, such as Three in One Phone, and the direct mode profile 430 includes BIP (Basic, which is a profile required to implement direct mode services, such as direct printing). Imaging Profile), BPP (Basic Printing Profile), and the like. Therefore, when making a call using a camera phone in a piconet where an access point exists, it is connected to an external wired network through the access point and can be used like a wireless phone, and a call is made to a camera phone by executing an application related to direct printing. At the same time, it is possible to have a photograph previously taken out on the printer.

In addition, the protocol stack of the printer 310 according to the preferred embodiment of the present invention includes the RF 442, the baseband 444, the LM 446, the L2CAP 448, the RFCOMM 450, the OBEX 452, and the SDP. The basic protocol stack structure including 480 further includes a direct mode profile 440, which includes a basic imaging profile (BIP) and a basic printing profile (BPP), which are profiles required for implementing direct printing between a camera phone and a printer. ), And the like.

On the other hand, the protocol stack of the access point 320 according to an embodiment of the present invention in the protocol stack structure consisting of RF (442), baseband 424, LM 426, L2CAP (428), SDP (470) Tunneling management unit 460 for tunneling the AP mode profile 420 associated with the AP mode service and the direct mode service-related messages exchanged between the camera phone and the printer is further included. In the case of the tunneling management unit 460, it is preferable that the tunneling manager 460 is formed on the L2CAP 428 layer so as to minimize the time required for tunneling messages related to the direct mode service.

The tunneling management unit 460 stores a management table for message tunneling. A management table according to an embodiment of the present invention will be described below with reference to FIG. 5.

In the management table, first parameter values for the L2CAP connection with the camera phone and second parameter values for the L2CAP connection with the printer are stored. Each parameter includes a unique value for a service, a PSM (Procotol and Service Multiplexer), a source connection ID (SourceCID), and a destination connection ID (DestinationCID).

PSMs 512 and 522, sender connection IDs 514 and 524, and receiver connection IDs 516 and 526 are parameters required for L2CAP connections to devices such as camera phones and printers at the access point. It has a byte size. The value of the PSM may be assigned a value other than the reserved value in the Bluetooth specification, for example, a value between 0x1000 and 0xFFFF, and the assigned value is not changed. The values for the sender connection ID and the receiver connection ID may be assigned values except for reserved values for each PSM, for example, values between 0x0040 and 0xFFFF.

Therefore, when direct printing is executed while the camera phone 310 is connected to the external wired network 230 through the access point 320 and used, the message related to the direct printing is the direct mode profile 430 in the camera phone, OBEX. 432, the RFCOMM 434, the L2CAP 408, the baseband 404, and so on, in turn, are processed according to the role of each layer, and then the access point 320 is passed through the RF stage 402 of the Bluetooth module. The message received through the RF terminal 422 of the access point 320 is transmitted to the tunneling manager 460 via the baseband 424 and the L2CAP 428. Subsequently, the tunneling manager 460 of the access point refers to the management table, and transmits the connection side connection ID value and the reception side connection ID value for the camera phone included in the message transmitted from the L2CAP 428 to the transmission side connection to the printer. The message is sent to the printer by substituting the ID and the connection ID.

Next, FIG. 6 shows a logical block diagram of each terminal as described above. The camera phone 300 according to the embodiment of the present invention reads the PSM value from the SDP record of the access point and creates an L2CAP connection with the SDP module 624, which is an AP mode application 620 for Three in One Phone. ), A direct mode application 622 for direct printing and a Bluetooth module 610.

According to an embodiment of the present invention, the access point 320 includes an SDP record 644 in which a PSM value necessary for L2CAP connection with the camera phone 300 is registered, an SDP module 624 of a camera phone, or an SDP module of a printer ( 646), the SDP module 646 for retrieving service contents and reading parameters necessary for establishing an L2CAP connection with the camera phone 300 and the printer 310, and the management table 640 generated based on the parameters read by the SDP module. It includes a tunneling management unit 640 and a Bluetooth module for tunneling the direct printing message exchanged between the camera phone 300 and the printer 310, including.

Next, the printer 310 according to an embodiment of the present invention is an SDP record 662 storing parameters necessary for L2CAP connection with an access point, an SDP module 664 forming a connection with the access point 320, and a direct connection. It includes a Bluetooth module for direct mode applications and data transmission and reception for printing.

7 is a conceptual diagram illustrating a process of tunneling a direct printing message exchanged between a camera phone and a printer through a tunneling manager of an access point in a terminal including the software module as described above.

First, when power is applied to the access point 320 and the printer 310, the SDP module 646 of the access point registers the PSM value in the SDP record 644 (S701), and the SDP module ( 664 registers a PSM value in the SDP record 662 (S702).

Thereafter, the SDP module 624 of the camera phone 300 reads the PSM value from the SDP record 644 of the access point (S710) and establishes an L2CAP connection with the access point 320 (S711). In this process, the sender connection ID and the receiver connection ID values for the L2CAP connection between the camera phone and the access point are assigned, and the assigned connection ID and receiver connection ID are assigned to the PSM read from the SDP record of the access point. A value and a first parameter pair are formed.

The SDP module 646 of the access point 320 then reads the PSM value stored in the SDP record 662 of the printer 310 (S720) and establishes an L2CAP connection with the printer 310 (S721). In this process, the sender connection ID and the receiver connection ID values for the L2CAP connection between the access point 320 and the printer 310 are assigned, and the sender connection ID and the receiver connection ID assigned the values are L2CAP connections of the printer. A second parameter pair is formed with the PSM used in the.

Next, the tunneling manager 460 of the access point generates a management table composed of the first parameter pair and the second parameter pair (S730).

Subsequently, when direct printing is performed in the camera phone, the camera phone transmits to the access point including the reception side connection ID and the transmission side ID allocated to the L2CAP connection with the access pointer in the message related to the direct printing (S740).

 When the message transmitted from the camera phone is transmitted to the tunneling management unit through each protocol layer of the access point, the tunneling management unit sets the connection side connection ID value and the reception side connection ID value included in the received message according to the contents of the management table. After replacing the sender connection ID value and the receiver connection ID value included in the two parameter pairs (S750), and transmits the corresponding message to the printer (S760).

Conversely, when a message related to direct printing is sent from the printer to the camera phone, the printer includes the incoming connection ID value and the sender connection ID value assigned to the L2CAP connection with the access point in the message related to the direct printing to the access point. It transmits (S770). When the message transmitted from the printer is passed to the tunneling management unit through each protocol layer of the access point, the tunneling management unit may set the first connection ID value and the reception connection ID value included in the received message according to the contents of the management table. After changing the sender connection ID value and the receiver connection ID value included in the parameter pair (S780), the corresponding message is transmitted to the camera phone (S790).

After all of the direct printing messages exchanged between the camera phone and the printer through the tunneling process as described above, the access point 320 terminates the L2CAP connection with the camera phone 300 and the printer 310 (S792, S794). Allow other slave terminals to communicate with the master.

With reference to the drawings exemplified as above, the method and system for transmitting the information of the digital broadcast receiver using the short message service according to the present invention have been described, but the present invention is an embodiment and drawings disclosed herein Without being limited thereto, various modifications may be made by those skilled in the art within the scope of the technical idea of the invention.

As described above, the method and system for using the AP mode service and the direct mode service simultaneously using the tunneling function of the access point according to the present invention have one or more of the following effects.

First, there is an advantage that the direct access service can be used simultaneously with the AP mode service in the slave terminal in the piconet where the Bluetooth access point is set as the master.

Claims (5)

A first wireless terminal that can be connected to a wired network through an access point, including an AP mode application and a direct mode application, and instructs direct printing of embedded content; A second wireless terminal including an application for providing a direct printing service to the first wireless terminal; And And an access point for tunneling the messages via direct conversion service related messages exchanged between the first wireless terminal and the second wireless terminal through conversion of a parameter included in the messages. The method of claim 1, wherein the access point is And a tunneling manager configured to tunnel the message exchanged between the first wireless terminal and the second wireless terminal. The method of claim 2, wherein the tunneling management unit And a management table comprising a first parameter pair for forming a radio channel with the first wireless terminal and a second parameter pair for forming a radio channel with the second terminal. It may be connected to a wired network through an access point, including an AP mode application and a direct mode application, and forms a first wireless channel with a first wireless terminal instructing direct printing on embedded content, and connects to the first wireless channel. Allocating values for a sender connection ID and a receiver connection ID for the receiver; The access point establishes a second wireless channel with a second wireless terminal that includes an application that provides a direct service to the first wireless terminal, wherein the access point establishes a second connection channel and a receiving connection ID for the second wireless channel. Assigning a value for the unit; In the tunneling manager of the access point, a management table including a transmitter side connection ID value and a receiver side connection ID value for the first radio channel, and a transmitter side connection ID value and the receiver side connection ID value for the second radio channel, Generating; And And tunneling the message by converting a parameter included in a direct printing related message exchanged between a first wireless terminal and a second wireless terminal according to the contents of the management table. The method of claim 4, wherein the tunneling step And transmitting the parameter included in the message transmitted from the first wireless terminal to the second terminal by replacing the parameter included in the wireless channel of the access point and the second terminal according to the contents of the management table. How to Provide Wireless Services.

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