KR100680498B1 - Method for building a scatternet of bluetooth - Google Patents

Abstract

The present invention relates to a method for forming a scatternet between Bluetooth devices, and more particularly, to form a scatternet between devices under the control of a predetermined server, and accordingly, a method for forming a scatternet to control functions of each device in a server. It is about.

According to the present invention, there is provided a scatternet forming method configured to transmit a connection request to a server around a predetermined server, and to connect to the device by receiving a predetermined lower device from the server.

This allows the formation of a scatternet that can perform remote control of each device on the scatternet through a server.

Bluetooth, Scatternet

Description

Method for building a scatternet of bluetooth

1 is a schematic diagram of a scatternet for explaining the present invention;

Figure 2a is a view showing the structure of a scatternet formed in accordance with a preferred embodiment of the present invention,

FIG. 2B is a schematic diagram showing a method of forming the scatternet shown in FIG. 2A.

* Explanation of symbols for main parts of the drawings

100, 102: piconet 104: server

106: first device 108: second device

The present invention relates to a method for forming a scatternet between Bluetooth devices, and more particularly, to form a scatternet between devices under the control of a predetermined server, and accordingly, a method for forming a scatternet to control functions of each device in a server. It is about.

Bluetooth is a short-range wireless communication technology standard developed to enable free wireless communication between various devices in a relatively small area (10-100m) at low cost and low power consumption. In 1994, Ericsson Mobile Communication Group began researching low-power, low-cost radio interfaces between mobile phones and peripherals.In February 1998, Ericsson, Nokia, IBM, Toshiba, and Intel The Bluetooth Special Interest Group (SIG) was established, and the version 1.0 Bluetooth specification was released in August 1999 by the SIG, and the official international standards organization was the IEEE 802.15 workgroup to establish international standards based on the Bluetooth standard. Is working closely with SIG.

Bluetooth can be installed in all information devices used in homes and offices, and it is possible to configure a wireless network between them and to interwork with any wired / wireless network. Therefore, when the wireless network using Bluetooth is completed, data exchange between all information devices, especially laptops, PDAs, and mobile phones, is free. When the Internet bridge is configured using Bluetooth, it reaches the desktop computer through optical cable, ADSL, modem, etc. Internet information can be reached in the user's hand. In other words, by using Bluetooth, anyone can reach the ultimate goal of wireless communication anytime, anywhere, anyone, any type of information exchange.

The Bluetooth network is configured as a master / slave. A master device can have up to seven slaves. The Bluetooth network configured by one master is called a piconet, and a Bluetooth network to which a plurality of piconets are connected is called a scatternet.

The piconet is a suitable structure for constructing a personal area network (PAN), and the scatternet is a suitable structure for constructing a mobile AD-HOC network. The establishment of a scatternet allows free communication between devices using Bluetooth, which can be used in many fields such as exchanging information using Bluetooth in conference halls, implementing a wireless office, and configuring a wireless home network.

However, the Bluetooth SIG does not define a protocol for forming a scatternet, and thus, various various scatternet formation protocols have been proposed.

It is therefore an object of the present invention to provide a method for forming a scatternet of Bluetooth to control the connection of each device through a central server as a new method of forming a scatternet.

In order to achieve the above object, a scatternet forming method according to the present invention comprises the steps of designating any one of the devices to form a scatternet as a server, the remaining devices to page the server; The server making a connection with a first device that performs paging to itself in its communication area; Identifying, by the first device, a second device performing paging to the server in its communication area, and transmitting connection request information with the second device to the server; Instructing, by the server, the first device to connect with the second device through connection request information with the second device received from the first device; And making a connection by performing the paging of the first device to the second device according to the command.

The connection request information with the second device may include an address of the second device and a reception sensitivity strength value of the second device.

In the present invention, the first device is a plurality of devices, when the server receives the connection request information with the second device from the plurality of first devices, receiving the second device in the received connection request information The first device having transmitted the largest value as the sensitivity strength value is characterized in that the command to the connection with the second device.

In addition, the number of devices currently connected to each of the plurality of first devices that have sent the connection request information may be checked, and the first device having the smallest number of devices may be instructed to connect with the second device. .

Data transmission from the server to a specific device according to the present invention is performed through data broadcasting to lower devices, and when receiving the data from the specific device, it is confirmed that it is its data and receives data It is done.

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

1 is a view showing a schematic diagram of a scatternet for explaining the present invention, the piconet 100 is a piconet in which communication has already been established by establishing a relationship between a master and a slave, and a device belonging to the piconet 100. Among them, the centrally located device 104 is the master, and the peripheral device 106 is the slave. Here, the master device 104 will be referred to as a server 104, and the device 106 connected to the server 104 as a slave will be referred to as a first device 106.

In general wireless communication, communication is possible only within the communication reach of the effective radio wave due to the limitation of the signal strength. However, when communication between devices of different piconets becomes possible, the communication reach is extended to the space containing two piconets, and further, when data is sequentially transmitted between multiple piconets, the space containing multiple piconets Communication reach is extended.

Accordingly, the server 104 uses the first device 106 connected as a slave to the second device 108 to perform communication with the new second device 108 that does not exist in its communication area. By acquiring information about the < RTI ID = 0.0 >) and controlling the first device 106 and the second device 108 to communicate and form a new piconet 102, the server < / RTI > Enable control over As a result, the piconet 100 in which the server 104 and the first device 106 are in a master-slave relationship, and the piconet 102 in which the first device 106 and the second device 108 are in a master-slave relationship, It will form a scatternet connected to each other.

Figure 2a is a view showing the structure of a scatternet formed in accordance with a preferred embodiment of the present invention, Figure 2b is a schematic diagram showing a method of forming a scatternet shown in Figure 2a.

Referring to Figure 2a, it can be seen that the structure of the scatternet formed according to the present invention shows a state in which the lower devices are connected in a tree structure around one server (S), as described above in the present invention By providing a method formed around the server, each subordinate device (TL1 to TL6) can form a network that can be remotely controlled by the server.

The method of forming the scatternet shown in FIG. 2A will be described in detail with reference to FIG. 2B. First, any one of the devices participating in the formation of the scatternet is designated as a server. The remaining devices TL1 to TL6 need to be pre-configured with the address of the designated server. Here, the rest of the devices TL1 to TL6 receive the address of the server so that the devices are located in the communication area of the server to communicate with the server for a certain time and participate in the scatternet formation in addition to the method provided from the server. Instead of placing the devices in the communication area of the server, a method of providing the addresses of the servers to the devices through user intervention may be used.

As shown in FIG. 2A, the three devices TL1, TL2, and TL3 are devices that exist in the communication area of the server, and TL4, TL5, and TL6 are devices that do not exist in the communication area of the server.

The device designated as the server performs a page scan with its own address (200), and discovers devices paging to its own address within its own communication area. The devices TL1 to TL6 perform paging at predetermined time intervals with the address of the server stored in advance (202).

Accordingly, the server knows that only TL1, TL2, and TL3 in the communication area are performing paging, and transmits a response signal for paging of TL1, TL2, and TL3 (204). A connection is made between the TL2 and TL3 devices (206), and one piconet is formed.

The TL4, TL5, and TL6 devices continuously page to the server's address in order to connect with the server, and the server cannot detect paging of the TL4, TL5, or TL6 that does not exist in its communication area. After TL1, TL2, and TL3 connected to the subordinate devices of the server are connected to the server, the device performs a paging scan to the address of the server and checks whether there is a device that performs paging to the server around (208).

Accordingly, when TL1 discovers paging of TL4, TL5, TL2 discovers paging of TL4, TL5, TL6, and TL3 discovers paging of TL5, TL6, each of TL1, TL2, TL3 The devices transmit connection request information with the devices found through the page scan to the server (210, 214).

Therefore, the server uses the connection request information with TL4, TL5, and TL6 transmitted by the TL1, TL2, and TL3 devices to select TL4, TL5, and TL6 devices that are paging themselves. It specifies whether to connect to the lower device of (216).

Here, the connection request information with TL4, TL5, and TL6 transmitted by the TL1, TL2, and TL3 devices to the server is the address of devices found by each of the TL1, TL2, and TL3 devices as they scan the page with the address of the server. As assumed, TL1 means the address of the TL4, TL5 device, TL2 means the address of the TL4, TL5, TL6, TL3 means the address of the TL5, TL6 and the reception sensitivity of the device.

The server receiving the connection request information from each of the TL1, TL2, and TL3 devices checks the connection request information so that the number of devices connected to one of the TL1, TL2, and TL3 devices does not increase. The device (TL1, TL2, or TL3) which has the largest value as the reception sensitivity value for each TL4, TL5, and TL6 devices, and the device having the largest reception sensitivity (TL4, TL5, or TL6) is specified to be connected to each other.

In other words, the server checks the information on the number of connected devices of each of the TL1, TL2, and TL3 devices connected to the server, and designates the connection with the devices that the TL1, TL2, and TL3 devices have requested to connect. It designates the connection with the device that can communicate smoothly considering the reception sensitivity of TL4, TL5, TL3 devices detected by TL1, TL2, TL3 devices.

In order to match the connection structure as shown in Figure 2a in the present invention, after the server examines the connection request information of each TL1, TL2, TL3 devices, the following TL1-TL4, TL2-TL5, TL3- TL6 connection designation Then, TL1 is instructed to connect TL4, TL2 to TL5, and TL3 to connect TL6 (218). Each device TL1 receiving the command paging to TL4, TL2 to paging to TL5, and TL3 to paging to TL6 (220).

Each TL4, TL5, or TL6 device performs a page scan to its address at a predetermined time interval after paging to the server (212), and TL1, TL2, or TL3 to page to itself through the page scan. When the devices are found, by sending a response signal for paging to the device (222), each TL4, TL5, and TL6 devices existing outside the communication area of the server are connected to each other (224), A new scatternet is formed.

In the scatternet formed as described above, the server may perform data transmission to devices TL4, TL5, and TL6 existing outside its own communication area. In the scatternet formed according to the present invention, the server may be connected to devices located far away. Remote control of the system.

In the scatternet according to the present invention, the server transmits data to a specific device by broadcasting the data by including the address of the device to receive the data in the transmitting data, and the broadcasting is continuously performed through the lower devices of the server. It is characterized in that the data is transmitted to all the devices forming the scatternet as it occurs, each device receiving the data in this data method whether the device address included in the data is the same as its own address. If it is the same as its own address, it decides to accept the received data as its own data. In the present invention, the data is transmitted through such a data transmission method, and thus, when the server transmits data to each device on the scatternet, the server can perform data transmission without the hassle of forming a routing path to the destination device. To help.

The present invention is not limited to the above-described embodiments and can be variously modified and implemented by those skilled in the art without departing from the technical spirit of the present invention.

According to the present invention, a server according to a predetermined server transmits a connection request to a scatternet, receives a predetermined subordinate device from the server, and provides a method for forming a scatternet configured to be connected with the device. This allows a scatternet to be formed that can perform remote control of each device on the scatternet.

So, if you want to install an air-conditioner or a fan in an existing school building and control it centrally, by connecting the above product to the server in the center and the communication according to the present invention, a separate network line between the server and each product Allows centralized control without work.

Claims (5)

Designating any one of the devices to form a scatternet as a server, and the remaining devices perform paging to the server; The server making a connection with a first device that performs paging to itself in its communication area; After the first device is connected to the server, the second device performs a paging scan to the address of the server and checks the second device performing the paging to the server within its communication area, and connects the connection request information with the second device. Transmitting to the server; Receiving, by the server, connection request information with the second device transmitted from the first device, and instructing the first device to connect with the second device; And And establishing a connection by the first device performing a paging to the second device according to the command. The method of claim 1, And the connection request information with the second device comprises an address of the second device and a received sensitivity strength value of the second device. The method of claim 2, When the first device is a plurality of devices, and the server receives connection request information with the second device from the plurality of first devices, And a command for connecting the second device to the first device which has transmitted the largest value as the received sensitivity strength value of the second device in the received connection request information. The method of claim 1, When the first device is a plurality of devices, and the server receives connection request information with the second device from the plurality of first devices, The number of devices currently connected to each of the plurality of first devices that have sent the connection request information is checked, and the first device having the smallest number of devices is instructed to connect with the second device. How to form a scatternet. The method of claim 1, The data transmission from the server to a specific device is performed through data broadcasting to lower devices, and when receiving the data from the specific device, confirms that it is its own data and receives the data. How to form a scatternet.

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