KR20020071153A - Method for detecting inquiry result using class of device in wireless link of short range mobile radio system - Google Patents

Abstract

PURPOSE: A method for detecting an inquiry result using a device class in a local mobile wireless communication system is provided to efficiently search a device necessary for a service by searching only slaves for providing the service and notifying the slaves to an external device. CONSTITUTION: If a service is generated from an external device, a link control unit senses the generated service(401). The link control unit performs an inquiry process for searching a device for providing the service(403). The link control unit checks whether the inquiry result is received from slaves(405). If the inquiry result is received from all slaves, the link control unit detects device classes from the inquiry results(407). The link control unit checks whether a device class which satisfies conditions received and stored from the external device exists(409). If the device class exists, the link control unit stores only the device class which satisfies the conditions(411). The link control unit generates a bluetooth device address list about the detected device classes and reports the generated bluetooth device address list to the external device(413).

Description

METHODS FOR DETECTING INQUIRY RESULT USING CLASS OF DEVICE IN WIRELESS LINK OF SHORT RANGE MOBILE RADIO SYSTEM}

The present invention relates to a method of finding and displaying Bluetooth devices by an inquiry when a service occurs in a short-range mobile wireless communication system of the present invention. In particular, the present invention corresponds to a service generated by using a device class among Bluetooth devices by a query. It relates to a method of filtering and reporting only the devices that are being used.

In general, a short-range mobile wireless communication system refers to a system that forms a wireless link between communication devices, such as a mobile phone, a notebook computer, and a desktop computer, located within about 10 meters, and performs real-time communication of voice and data between the formed wireless links.

Representative short-range mobile wireless communication systems include Bluetooth wireless link method recently proposed by Ericsson of Sweden and Nokia of Finland. The Bluetooth has a wired connection with each of various external communication devices (hereinafter, referred to as "external device") such as a mobile phone, a computer, a facsimile, and the like, so that the external devices can be connected by a wireless link. It has the advantage of being protected from over interference. Hereinafter, a system in which a plurality of Bluetooth devices are connected is called a Bluetooth system.

The Bluetooth system is composed of one master Bluetooth device and a plurality of slave Bluetooth devices. The master is a Bluetooth device in which the service is generated, and the slaves are Bluetooth devices which are serviced subordinately from the master. In other words, the Bluetooth device where the service occurs becomes the master. When a service occurs in a specific Bluetooth device, the master in which the service occurs performs an inquiry process for synchronizing with slaves in a standby state, that is, checking whether there are slaves in the vicinity. By the query process, slaves are assigned an address and transition to a page scan status, where a piconet is formed. Typically, the master assigns eight addresses, and one is used as a broadcast channel, so seven slaves form one piconet.

When the master performs a query to see if there are slaves around, all slaves in a discoverable mode send query results to respond to the master to the query. Upon receiving the query result from the neighboring slaves, the master transmits a list including addresses for all the received slaves to an external device connected to it by wire. In this case, the external device receives the list and displays the list on the LCD.

1 is a block diagram of a general short-range wireless mobile communication system. Referring to FIG. 1, reference numeral 101 denotes a Bluetooth device, that is, a master, having a service. The master 101 queries all peripheral slaves 103, 105, 107,..., 109. Slaves 103, 105, 107,..., 109 in the piconet transmit the query result to the master 101 in response to the query. The master 101 assigns an address to the neighboring slaves through the querying process. Upon receiving the query result, the master 101 obtains an address list of Bluetooth devices from all the query results and transmits the address list to an external device (not shown). The external device then displays the address list on the liquid crystal display.

As described above, it is possible to receive a query result for a large number of slaves after performing a conventional query. Based on this, an address list is prepared and transmitted to an external device, and the external device receives all slaves based on the received address list. It is difficult to find a device for providing a service since the addresses for the A are displayed.

In addition, if the external device is a mobile phone having a small liquid crystal display device capable of displaying an address, the user has to find and scroll through the addresses.

Accordingly, an object of the present invention is to filter a device obtained from a query result received in a query process in a short-range mobile wireless communication system according to a condition corresponding to a generated service to create a list including only addresses of slaves to provide a service actually generated. It provides a way to report.

The present invention for achieving the above object; A method of detecting a query result using a device class corresponding to slaves connected to the master in a master of a short-range mobile wireless communication system in which a service is generated, the external device having a condition indicating slaves to provide the service when a service occurs. Receiving and storing the information received from the slave, receiving a query requesting information including the device class from the slaves, receiving query results from the slaves, and receiving a device class from the query results. And the device address list of the slaves for the device classes satisfying the condition by comparing the condition with the detected device classes.

1 is a view showing a configuration in a general short-range mobile wireless communication system.

2 is a diagram showing the configuration of Bluetooth in a short-range mobile wireless communication system to which the present invention is applied.

3 is a procedure showing an inquiry process in a short-range mobile wireless communication system to which the present invention is applied.

4 is a view showing a query result display method using a device class in a short-range mobile wireless communication system according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

2 is a diagram showing the configuration of Bluetooth in a short-range mobile wireless communication system to which the present invention is applied. Hereinafter, the configuration and operation of Bluetooth according to the present invention will be described with reference to FIG. 2.

In FIG. 2, reference numeral 210 denotes a Bluetooth, and 230 denotes an external device such as a computer, a mobile phone, or the like connected to the Bluetooth. The Bluetooth 210 includes a radio frequency transmitter 211, a radio frequency receiver 213, a baseband processor 215, a link controller 217, and a memory 219. The radio frequency transmitter 211 converts an input intermediate frequency signal into a radio signal and transmits the radio signal through an antenna through a duplexer (not shown). The duplexer operates according to a time division multiplexing scheme. The radio frequency receiver 213 receives a radio signal received through an antenna through a duplexer, converts the radio signal into an intermediate frequency signal, and outputs the converted radio signal. The frequency band of the radio signal is 2.4 GHz. The baseband processor 215 converts an intermediate frequency received through the radio frequency receiver 213 into a baseband signal, converts the intermediate frequency into a host control interface (HCI) packet, and outputs the intermediate HCI packet. The frequency is converted into a frequency and output to the radio frequency transmitter 211. The link controller 217 controls the Bluetooth 210 according to a command packet input from the external device 230, and requests and result information of the slave side input through the baseband processor 215. It analyzes and transmits the HCI packet to the external device 230. In particular, the link control unit 217 performs a query when a service occurs, detects the addresses of the slaves according to the present invention from the query result received from the slave side, and only the devices for the slaves corresponding to the service. Filter and report to the external device 230. The memory 219 stores a command received from the external device 230 or information on the slave side received from the baseband processor 215.

FIG. 3 is a procedure diagram illustrating an inquiry process in a short-range mobile wireless communication system to which the present invention is applied. Referring to FIG.

When a service such as generation of data to be transmitted from the external device 230 occurs, the Bluetooth 210 as the master transmits query information to the slaves 310, 320, 330,..., 340 in step 351. Each of the slaves transmits the query result for the query to the master 210 in steps 353, 355, 357, and 359. The query result may be a device class of each of the slaves.

The link control unit 217 of the master 210 receiving the query result performs filtering by performing the process of FIG. 4 below. A description with reference to FIG. 4 is as follows.

If a service occurs from the external device 230, the link control unit 217 detects this in step 401, and proceeds to step 403. The link control unit 217 should receive a condition corresponding to the service from the external device 230 when the service occurs. In step 403, the query process of FIG. 3 is performed to find a device to provide the service. The link controller 217 checks whether a query result is received from slaves through the query process in step 405, and if the query result is received in step 405, stores the query result in the memory 219. If the query result is received from all slaves, the link controller 217 proceeds to step 407 and detects device classes from the stored query results. If the device classes are detected, the link controller 217 checks whether there is a device class that satisfies the condition received and stored by the external device 230 in step 409. If there is a device class that satisfies the condition, the link controller 217 proceeds to step 411 to store only the device class that satisfies the condition, and proceeds to step 413 to generate a Bluetooth device address list for the detected device classes. Report to the external device 230.

For example, the condition received from the external device 230 is 0x040204, the device class of the first slave of FIG. 3 is 0x040204, the device class of the second slave is 0x040200, and the device class of the third slave is 0x040204. If the nth slave is 0x040200, the link control unit 217 stores only the query result for the first slave 310 and the third slave 330 having the same device class as the condition, and the first slave 310 and the first slave. 3, the Bluetooth device address list of the slave 330 is prepared and reported to the external device 230.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Therefore, when there are many Bluetooth devices around, the present invention finds only slaves to provide a service and notifies the external device, so that the user can efficiently find a device required for the service.

Claims (1)

In the query result detection method using a device class corresponding to each of the slaves connected to the master in the master of the short-range mobile wireless communication system where the service occurs, Receiving and storing a condition indicating the slaves to provide the service from an external device when a service occurs; Performing a query requesting information including the device class to the slaves; Receiving query results according to the query from the slaves, and detecting device classes from the query results; And comparing the condition with the detected device classes to create and report a device address list of slaves for device classes satisfying the condition.