KR20030079247A - All for one communication system using radio frequency and the method thereof - Google Patents

Abstract

PURPOSE: A one-to-many communication system using RF signals is provided so that a master unit can sequentially select many slave units and execute communication with them using RF signals having a single frequency band. CONSTITUTION: A master unit transmits response request codes to many slave units(S301). The master unit judges whether response signals exist(S302). If response signals exist, the master unit judges whether the number of slave units that sent response signals is one or more than two(S303). If the number is one, the master unit executes one-to-one communication with the slave unit by using one frequency band(S304). In case that the number is more than two, the master unit changes the conditions to limit the range of intrinsic codes granted to the slave units and transmits response request codes to the slave units under the changed conditions(S305). Then the master unit judges again whether response signals exist(S306). If response signals exist, the master unit judges whether the number of slave units that sent response signals is one or more than two(S307). If the number is one, the master unit executes one-to-one communication with the slave unit(S308).

Description

All for one communication system using radio frequency and the method

The present invention relates to a one-to-many communication apparatus and method using an RF signal having a single frequency band.

The RF signal, which is widely used at present, is a high frequency signal that transmits a baseband signal including information of actual voice, video, data, and the like, and is used in an automatic garage door opener, a vehicle automatic payment calculator, a radio broadcast, and a television broadcast.

1 is a schematic diagram illustrating one-to-many communication using an RF signal. As illustrated, one master device and a plurality of slave devices perform communication using an RF signal. In one-way communication such as broadcasting, one master device is used. In this case, only one frequency band is required in this case. However, most current devices must perform bidirectional communication for data exchange between the master device and the slave device, and for this bidirectional communication, a unique frequency band must be allocated to each slave device for half or full duplex. Therefore, when a plurality of devices perform two-way communication using the RF signal, a wide frequency band is required to allocate a frequency band to each slave device, which causes the RF module for signal processing of the widened frequency band. There was a problem that the manufacturing cost is increased.

Accordingly, an object of the present invention is to overcome the above problems, by which one master device sequentially selects a plurality of slave devices to perform RF communication so that communication can be performed using an RF signal having a single frequency band. It is an object of the present invention to provide a one-to-many communication device and a method thereof.

1 is a schematic configuration diagram of a conventional RF communication system.

2 is an internal configuration diagram of a master device and a slave device according to the present invention.

3 is a flowchart showing the overall processing of the communication method according to the present invention.

4 is a flowchart illustrating an embodiment of a communication method of the present invention.

* Description of Major Symbols in Drawings *

1: Master device 2, ..., n: Slave device

10: master control module 20: slave control module

100: RF Module

The apparatus of the present invention for achieving the above object,

In a communication device performing one-to-many communication using an RF signal, a baseband signal including data is modulated, converted into an intermediate frequency, and then converted into an RF signal and transmitted to the outside, and an RF signal received from the outside is transmitted. An RF module for converting to an intermediate frequency and demodulating the baseband signal again; And a master control module for selectively controlling communication with the plurality of slave devices by using the response request code and the unique code value of the slave device to perform communication with the selected slave device, and from the master device. When one of the response request code or the unique code value of the slave device for identifying the slave device is received from the transmitted signal, switching the slave control module to send a response signal to the master device to perform one-to-one communication It characterized in that it comprises a; control module for selecting and converting into a master device and a slave device by.

In addition, the communication method of the present invention for achieving the above object,

A first step in which one master device transmits response request codes to a plurality of slave devices using an RF signal having a single frequency band; A second step of determining whether there are response signals from the plurality of slave devices with respect to the response request code; If there is no response signal from the slave device as a result of the determination of the second step, repeating from the first step; and if there is a response signal, determining whether there is one or more response signals from the slave device; Wow; A fourth step of repeating the first step after the one-to-one communication between the master device and the slave device when the response signal of the third step is one; As a result of the determination in the third step, when there are two or more response signals, the master device narrows the range of the response request codes until only one slave device responds and repeatedly transmits the response request codes to the plurality of slave devices. Repeating the process of performing a selection communication to one slave device to perform communication with all the slave devices responded to in the third step, and when the communication is completed, the fifth step of repeating from the first step It is characterized by.

In the fifth step, when the determination result of the third step is two or more response signals, the plurality of slave devices are repeatedly narrowed while narrowing the range of the response request code until only one slave device responds to the master device. Transmitting a response request code to the mobile station; If only one slave device responds after the sixth step, the master device performs one-to-one communication with the slave device, and determines whether there is a change condition for one-to-one communication with another non-communicated slave device. A seventh step; And an eighth step of changing the condition and repeating from the sixth step if there is a change condition as a result of the determination of the seventh step, and repeating from the first step if there is no change condition.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention will be described in more detail the present invention.

The control module in the detailed description of the present invention includes a master control module 1 and a slave control module 2, and a control module before being converted into a master control module 1 or a slave control module 2 by a switch. Say

RF module 100 in the detailed description of an embodiment of the present invention because the configuration is the same, regardless of the master device 1 and the slave device (2, ..., n) as the same reference numerals referred to the RF module 100 Mark it.

In addition, reference numerals 2, .., n of the slave device denote a plurality of slave devices, and all slave devices are denoted by reference numeral 2 hereinafter.

2 shows an internal configuration diagram of a master device and a slave device according to the present invention.

As shown, the communication apparatus according to the present invention is one master apparatus (1) capable of selectively selecting a plurality of slave apparatuses to perform communication and the master apparatus (1) only when there is a selection of the master apparatus. It is configured to include a plurality of slave devices (2) for communicating with).

The master device 1 refers to a communication device in which the control module is switched to the master device.

The slave device 2 refers to a communication device in which a control module is switched to a slave device.

The control module includes both the master control module 10 and the slave control module 20, but may be configured separately from each of the master device 1 and the slave device (2).

The master device 1 modulates a baseband signal including data, converts it into an intermediate frequency, converts it back into an RF signal, and transmits it to the outside. RF module 100 for demodulating the signal, and the master control module 10 for selectively controlling one-to-one communication with the slave device 2 using the response request code and the unique code value of the slave device 2. It is configured to include).

The slave device 2 modulates the baseband signal including data, converts it into an intermediate frequency, converts it back into an RF signal, and transmits it to the outside. When either the RF module 100 for demodulating the signal and a response request code or a unique code value of the slave device for identifying the slave device are received from the signal transmitted from the master device, the master device responds to the master device. It comprises a slave control module 20 for sending a signal to perform a one-to-one communication with the master device (1).

The response request code or unique code value of the slave device for identifying the slave device has a number of digits with an optional combination of symbols. Each of the plurality of digits may include a wild symbol as a common response request code representing all the symbols of each digit. The symbol includes at least one or more of numbers, letters, or special characters. Examples of the wild symbol are *,? Etc. can be used, which can be arbitrarily designated by the user during initial setting.

In the above detailed description, the master control module 10 and the slave control module 20 are connected to an external device to provide data in addition to a function of controlling one-to-many communication between the master device 1 and the slave device 2. Receivable data port (not shown in the figure) may be further configured. By the above-described data port, the external device equipped with the master control module 10 and the slave control module 20 can exchange data with each other by RF signals.

The data port preferably supports bidirectional communication.

The process of the communication between the master device 1 and the slave device 2 of the present invention by the above configuration will be made clear by the description of FIGS. 3 and 4.

3 is a flow chart showing the overall processing of the communication method according to the present invention, Figure 4 is a flow chart showing the processing according to an embodiment for explaining the processing of Figure 3 in more detail.

The apparatus according to the present invention, which is configured in FIGS. 1 and 2, performs the operations as shown in FIG. 3 to communicate with each other.

In the communication method of the present invention, the master device 1 first generates a response request code including a wild symbol so that a plurality of slave devices 2 can all respond, and modulates the generated code data into an intermediate frequency to amplify it. After reconversion to a high frequency RF signal, the converted RF signal is driven again after drive amplification and power amplification and then sent out. In this case, when the generation of the code is a digital signal, digital-to-analog conversion may be performed (S301).

If there is a slave device 2 within the range of the RF signal transmitted by the master device 1, the slave devices 2 that have received the RF signal send a response signal corresponding to the response request code from the master device 1; In the same way as to convert the RF signal to be sent to the outside. Therefore, the master device 1 determines whether there is a response signal after the transmission of the response request code (S302).

If there is no response signal as a result of the determination in step S302, the process is repeated from step S301, and if there is a response signal, it is determined whether the number of responses (number of slave devices that sent the response signal) is one or more (S303). If the number is one, the master device 1 and the slave device 2 perform one-to-one communication by the RF signal using one frequency band, and repeat from step S301 (304).

If the result of the determination in step S303 is two or more, the master device 1 changes the condition for narrowing the range of unique code values assigned to the slave device 2, and then the slave device sends the response request code again under the changed condition. And transmits to (2) (S305).

Next, the master device 1 again determines whether there is a response to the response request code under the changed condition (S306). If there is no response, the master device 1 returns to step S305 to repeat the process, and if there is a response, It is determined whether the number of responses is one or more than two (S307).

As a result of the determination in step S307, if the number of responses is two or more, the operation is repeated from step S305. If the number of responses is one, the master device 1 performs one-to-one communication with the slave device 2 that responded (S308). In order to determine whether there is more slave device 2 to communicate again after the one-to-one communication in step S308, it is determined whether the condition change performed in step S305 is further required. If it is determined that no further condition change is necessary, the process is repeated from step S301. If it is necessary to change the condition until communication with all slave devices 2 responded in step S302 is completed, the process is repeated from step S305.

Through the processes of S301 to S309, one master device 1 and a plurality of slave devices 2 according to the present invention can communicate sequentially without interference with each other using a single frequency band.

FIG. 4 is a flowchart showing a process in the case where the range of the actual code value and the code value of the slave device 2 is limited in order to explain the process of FIG. 3 in more detail.

In FIG. 4, the code of the slave device 2 according to the present invention is designated as abc as an integer of three digits, the value of which is 100 from 100 to 199, and the number 1 of the a digit is the slave device 2. Is a constant for identifying the RF signal from the master device, and "? &Quot; is used as a wild symbol representing all the numbers 0 to 9 in the digits of b and c.

In the initial process as shown, the master device 1 assigns "1" to the three-digit a position as the response request code, and "?" To the b and c positions, and converts the abc value into an RF signal. It is sent out to the outside (S401). Receiving the transmitted signal, the slave device 2 identifies the response request signal from the master device 1 by identifying 1 of the digit of a, and identifies the number of b and c to match its code value. Or "?" As a wild symbol, the response signal is converted into an RF signal and sent out.

The master device 1 determines whether there is a response signal from the slave devices 2, and if there is no response signal, repeats from step S401 after waiting for a predetermined time (S418), and if there is a response signal, whether the number of responses is greater than one. Determine (S404). If the number of responses is 1, the master device performs one-to-one communication with the responding slave device 2 by a single frequency band, and then repeats from step S418.

If the number of responses is greater than 1, the master device 1 allocates "0" in place of b to respond if there is a slave device 2 from 100 to 109, and puts "?" In place of c. After the allocation, the abc value is converted back into an RF signal as a response request code and transmitted to the outside (S407).

The master device 1, which has transmitted the response request code in step S407, determines whether there is a response to the response request code (S408), and if there is a response, allocates 0 to the place of c (S409) and abc as the response request code. The value is converted into an RF signal and resent to the outside (S410). The abc value 100 determines whether there is a response from the slave device 2 having the code value of 100 as the code value of the slave device 2 (S411). After performing one communication (S412), the value of c is increased by one (S413), and it is determined whether the value of c is greater than nine (S414). If there is no response signal from the slave device 2 to the master device 1 after step S411, step S412 is omitted and step S413 is performed.

From step S409 to step S414 represents a repetitive process for the master device 1 to communicate with the slave device 2 from the code value 100 to 109.

Accordingly, if c is greater than 9, the next slave device code range, that is, the code value is 110 to 119, in order to perform slave device communication, c is again assigned "?" (S415), b increases 1 (S416), and then determines whether the value of b is greater than 9 (S417).

If b is less than 9, the slave device 2 to communicate still remains, and the process repeats from step S407.

If b is greater than 9 as a result of the determination in step S417, communication with all slave devices 2 is completed and step S418 is performed.

In the above detailed description of the present invention, the code value of the slave device is limited to three digits, but it is obvious that the number of digits can be expanded according to the needs of the user. In addition, although the code value is used as a decimal number, various modifications such as binary, octal, and hexadecimal may be used.

Further, in the present invention, the master device 1 and the slave device 2 have the same downlink frequency from the master device 1 to the slave device 2 and the uplink frequency band from the slave device 2 to the master device 1. Can be specified. In this case, the master device 1 and the slave device 2 perform half duplex communication.

In addition, in the present invention, one downlink frequency from the master device 1 to the slave device 2 is designated, and all slave devices although the uplink frequency from the plurality of slave devices 2 to the master device 1 are different from the downlink frequency. In (2), the same can be specified. In this case, the master device 1 and the slave device 2 perform full duplex communication.

As described above, the present invention provides a one-to-many communication using RF signals between a master device and a plurality of slave devices, and does not allocate a unique frequency band for communication to each of the master device and the plurality of slave devices. In order to perform communication using a single frequency band, it is possible to perform one-to-many communication using one frequency band without wasting the frequency band, and to reduce the manufacturing cost of the RF module. To provide the effect.

Claims (8)

In a communication device for performing one-to-many communication using an RF signal, An RF module for modulating a baseband signal including data, converting the signal into an intermediate frequency, and then converting the baseband signal back to an RF signal and transmitting the result to the outside, and converting an RF signal received from the outside into an intermediate frequency and demodulating the baseband signal back into a baseband signal; And, A master control module configured to selectively control communication with the plurality of slave devices by using the response request code and the unique code value of the slave device and to perform communication with the selected slave device; When one of the response request code or the unique code value of the slave device for identifying the slave device is received from the signal, the slave control module which transmits a response signal to the master device to perform one-to-one communication by switching One-to-many communication device using the RF signal comprising a; control module for selecting and converting the master device and the slave device. The method of claim 1, wherein the control module, A one-to-many communication device using RF signals, characterized in that it further comprises a data port for performing data communication with an external device. The method of claim 1, wherein the RF signal, One-to-many communication device using RF signal, characterized in that the master device and the slave device has one frequency band when the half-duplex communication, and the master device and the slave device has two frequency bands when the full-duplex communication . A first step in which one master device transmits a response request code to a plurality of slave devices using an RF signal having a single frequency band; A second step of determining whether there is a response signal from the plurality of slave devices with respect to the response request code; If there is no response signal from the slave device as a result of the determination of the second step, repeating from the first step; and if there is a response signal, determining whether there is one or more response signals from the slave device; ; A fourth step of repeating the first step after the one-to-one communication between the master device and the slave device when the response signal of the third step is one; In response to the determination result of the third step, when the response signal is more than one, the master device responds to the plurality of slave devices repeatedly responding by narrowing the range of the response request code until only one slave device responds. Repeat the process of selecting one slave device by performing a communication and performing communication to perform communication with all slave devices responding in the third step, and when the communication is completed, repeats the first step from the first step. One to many communication method using an RF signal, characterized in that made. The method of claim 4, wherein the fifth step, As a result of the determination in the third step, when there are two or more response signals, the master device narrows the range of the response request codes until only one slave device responds and repeatedly transmits the response request codes to the plurality of slave devices. A sixth step; If only one slave device responds after the sixth step, the master device performs one-to-one communication with the slave device, and determines whether there is a change condition for one-to-one communication with another non-communicated slave device. A seventh step; And, If the determination result of the seventh step, if there is a change condition, changing the condition to perform repeatedly from the sixth step, if there is no change condition, the eighth step of performing repeatedly from the first step; characterized in that it further comprises a One-to-many communication method using RF signal. The method of claim 4, wherein the slave device, And a communication method with the master device in any one of the cases where the response request code or the unique code uniquely assigned to the slave device is received from the master device. The method of claim 6, wherein the response request code, One-to-many using an RF signal having a plurality of digits with an optional combination of symbols, each of the plurality of digits may include a wild symbol as a common response request code representing all the symbols of each digit. Communication method. The method of claim 7, wherein the symbol is, A one-to-many communication method using an RF signal, characterized in that it comprises one or more of numbers, letters, or special characters.