KR101066881B1 - Communication system and method of walkie talkies using roip - Google Patents

Abstract

The present invention relates to a communication system between radios using RoIP, and more particularly, a transmission radio for converting a voice signal input through a microphone into a wireless data signal and transmitting it to a wireless space through an antenna; A transmitting RoIP server for converting wireless data transmitted from the transmitting radio into TCP / IP Internet data; A receiving RoIP server for receiving the converted Internet data through the Internet network, converting the converted RoIP server into a wireless data signal, and outputting the converted data; And a receiving radio receiving the wireless data signal outputted from the receiving RoIP server, converting the received wireless data signal into a voice signal, and outputting the converted audio signal to a speaker.

Description

Communication system and method between walkie talkies using RAPIP {Communication system and method of walkie talkies using RoIP}

The present invention relates to a method of performing communication between radios, and more particularly, to a communication system and method between radios using a RoIP that provides communication between radios through an internet based network based on an audio signal of the radio.

In general, mobile phones are full duplex and radios are half duplex. The frequency bands of mobile phones and radios are different. As the number of mobile phone users surges, the use of radios is relatively low.

However, in areas where the phone is not able to make a mobile phone call or in a region where the call sensitivity is low due to low sensitivity, or in a call congestion area such as an island or a mountainous area, it is more like a walkie talkie than a call through a base station like a normal mobile phone. It is efficient to make a direct call without going through a base station by using a separate frequency between users. In addition, it is more cost-effective to use a walkie-talkie if there is a direct call between users at close range. Therefore, in recent years, a method of adding a function such as a walkie-talkie to a portable device of a general mobile phone or a wireless phone has been studied to perform both functions.

In addition, the development of various services through digital communication is required beyond the simple functions of the radio, which provides only limited functions by conventional analog communication.

An object of the present invention is to provide a communication system and method between radios using a RoIP to provide communication between radios through an internet based network based on the audio signal of the radio.

In order to achieve the above object, a system according to the present invention comprises: a transmitting radio for converting a voice signal input through a microphone into a wireless data signal and transmitting to a wireless space through an antenna; A transmitting RoIP server for converting wireless data transmitted from the transmitting radio into TCP / IP Internet data; A receiving RoIP server for receiving the converted Internet data through the Internet network, converting the converted RoIP server into a wireless data signal, and outputting the converted data; And a receiving radio receiving the wireless data signal outputted from the receiving RoIP server, converting the received wireless data signal into a voice signal, and outputting the converted audio signal to a speaker.

At this time, the wireless data signal is characterized in that the data signal according to the wireless RS-232C communication protocol.

On the other hand, the receiving radio, when receiving a pilot tone signal from the transmitting radio, characterized in that for transmitting the reception start message to the receiving side RoIP server.

In this case, when the receiving RoIP server receives the receiving start message from the receiving RoIP server, the transmitting RoIP server transmits a transmitting start message to the transmitting radio.

The reception radio may transmit a reception termination message to the reception side RoIP server when receiving the communication termination detection code from the transmission radio.

In this case, when the receiving end RoIP server receives the receiving end message from the receiving side RoIP server, the transmitting RoIP server transmits the transmitting end message to the transmitting radio.

The transmitting RoIP server transmits any one message selected from among a channel change message, a signal sensitivity level change message, and a transmission power change message to the transmission radio.

According to an aspect of the present invention, there is provided a method of converting a voice signal input through a microphone into a wireless data signal in a transmitting radio and transmitting the wireless signal to a wireless space through an antenna; Converting wireless data transmitted by the transmitting radio into TCP / IP Internet data at a transmitting RoIP server; Transmitting the converted Internet data at the transmitting RoIP server to the receiving RoIP server through an internet network; Receiving the Internet data at a receiving RoIP, converting the Internet data into a wireless data signal, and outputting the converted data; And receiving a wireless data signal output from the receiving side RoIP server in a receiving radio, converting the received wireless data signal into a voice signal and outputting the same to a speaker.

In this case, the method includes: transmitting a pilot tone signal to a receiving radio according to a pressing of a PTT button on the transmitting radio; Transmitting a reception start message from a receiving radio to a receiving RoIP server; And transmitting a transmission start message from the transmitting RoIP server to the transmitting radio by receiving the reception start message at the receiving RoIP server.

The method also includes transmitting a communication end code to the receiving radio as the PTT button is released in the transmitting radio; Transmitting a reception end message from a receiving radio to a receiving RoIP server; And transmitting a transmission end message from the transmitting RoIP server to the transmission radio by receiving the reception end message at the receiving RoIP server.

The transmitting RoIP server transmits any one message selected from among a channel change message, a signal sensitivity level change message, and a transmission power change message to the transmission radio.

According to the present invention, there is an advantage in that the radio can provide various one-to-one communication services using digital subtones.

In addition, according to the present invention, by providing a communication between the radios through the Internet-based network based on the audio signal of the radio, there is an advantage that an instant call with a remote user through a TCP / IP network without a separate communication charge.

1 is a diagram illustrating a handoff system of a network radio to which the present invention is applied.
2 is a diagram illustrating a system of a network radio having a redundant receiver to which the present invention is applied.
3 is a diagram showing a bit format of transmission data to which the present invention is applied;
4 is a diagram showing a format of transmission data to which the present invention is applied.
5 is a diagram illustrating a communication system between radios using RoIP according to the present invention.
6 is a flowchart illustrating a transmission routine in a transmission radio using a RoIP according to an embodiment of the present invention.
7 is a flowchart illustrating a receiving routine in a receiving radio using RoIP according to an embodiment of the present invention.

The present invention proposes a method that can provide various various communication services using digital subtones in communication between radios. In particular, the present invention proposes a system and method for implementing a Radio Over Internet Protocol (RoIP) service providing communication between radios through an internet based network based on an audio signal of a radio as a next generation wireless communication method.

The RoIP service provided by the present invention enables wireless communication through a network radio anywhere in the world using IP-based technology, which is an international standard, and enables instant communication without additional communication charges and hearing loss areas.

DETAILED DESCRIPTION Hereinafter, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

First, before describing the RoIP service according to the present invention, the concept of a system for a network radio to which the present invention is applied will be briefly described. On the other hand, the present invention can be applied to any radio using a common frequency band, it is not limited to the network environment of Figs.

1 is a diagram illustrating a handoff system of a network transceiver to which the present invention is applied. Referring to FIG. 1, the first repeater 101 uses CH1 as a communication channel (TC), and the second repeater 102 uses CH2. In this case, the communication channel refers to a channel that contains a frequency for actually transmitting and receiving. In addition, each transmits a pilot tone signal, which is a tone signal that provides status information of the corresponding relay station.

Each radio 111-115 analyzes the pilot tone signal transmitted from each repeater and automatically changes the channel to the pilot tone signal of the best repeater. For example, radios 111 and 112 have the first repeater 101 because the pilot tone signal # 1 received from the first repeater 101 is better than the pilot tone signal # 2 received from the second repeater 102. Communication using the frequency signal transmitted from Similarly, radios 114 and 115 have a second repeater 102 because the pilot tone signal # 2 received from the second repeater 102 is better than the pilot tone signal # 1 received from the first repeater 102. Communication using the frequency signal transmitted from On the other hand, since radio 113 is in the overlapping area of the two repeaters, the two pilot tone signals are compared to handoff the repeater with better signal strength to maintain communication.

2 is a diagram illustrating a system of a network radio having a redundant receiver to which the present invention is applied. Referring to FIG. 2, the radios 211, 212, and 213 to which the present invention is applied may include a redundant receiver. In other words, radio 211 has 450.250Mhz as the primary RX (RX (P)) and 457.150Mhz as the secondary RX (RX (S)). Can simultaneously receive signals from In addition, radio 211 transmits a signal at a transmission frequency of 452.100Mhz, which can be received by both repeaters 201 and 202.

Therefore, repeater 201 uses 457.150Mhz as the transmission frequency and 452.100Mhz as the reception frequency. In addition, repeater 202 uses 450.250Mhz as a transmission frequency and 452.100Mhz as a reception frequency.

On the other hand, radio 213 is located closer to repeater 201, so the transmission frequency of repeater 201 is 457.1500Mhz as the primary RX (RX (P)) and 450.250Mhz is the secondary RX. (RX (S)), signals transmitted from the two repeaters 201 and 202 can be simultaneously received. In addition, radio 213 transmits a signal at a transmission frequency of 452.100Mhz, which can be received by both repeaters 201 and 202.

Hereinafter, a data format in communication using a digital subtone used for implementing a RoIP service of the present invention will be defined with reference to FIGS. 3 to 5.

3 is a diagram illustrating a bit format of transmission data to which the present invention is applied. Referring to FIG. 3, in FIG. 3, (a) is a bit representing a preamble and a communication end, and sets a bit period to 125 Hz (8.00 ms). (b) is a start bit and sets the period of the bit to 80 Hz (12.5 ms), and (c) is a bit indicating bit high (that is, '1') and the period of the bit is 200 Hz (5.00 ms). (D) is a bit indicating bit low (ie, '0'), and sets the period of the bit to 266.670 Hz (3.75 ms).

4 is a diagram illustrating a format of transmission data to which the present invention is applied. Referring to FIG. 4, the data format 400 of the digital subtone includes a preamble (401), a start code (402), a command code (403), and a reception terminal ID (Rx ID; 404). And a data field such as a transmission terminal ID (Tx ID) 405.

The preamble 401 is an area necessary for receiving and synchronizing the transmission data, and the start code 402 is an area indicating the start of a message. In addition, the command code 403 is an area for distinguishing what kind of command the message is, and the receiving terminal ID 404 and the transmitting terminal ID 405 are each for identifying the receiving terminal and the transmitting terminal, respectively. Means the unique number of the terminal. The messages transmitted for the RoIP service to be described later basically transmit data in the format shown in FIG. 4, and may be partially modified or added according to the type of service.

Hereinafter, a communication system and a method between radios using a RoIP according to an embodiment of the present invention will be described with reference to FIGS. 5 to 7.

5 is a diagram illustrating a communication system between radios using RoIP according to the present invention. Referring to FIG. 5, a transmission radio 510 and a RoIP server 520 are connected by a radio communication means. For example, data may be transmitted and received according to a wireless RS-232C communication protocol.

Meanwhile, in order to implement RoIP according to the present invention, the transmitting RoIP server 520 converts a radio signal received from the transmitting radio 510 into an Internet signal using the TCP / IP protocol and transmits the received radio signal to the receiving RoIP server 530. The TCP / IP internet signal received from the receiving RoIP server 530 is converted into a wireless signal of the RS-232C protocol and transmitted to the transmitting radio 510.

Accordingly, the TCP / IP internet signal converted by the transmitting RoIP server 520 is transmitted to the receiving RoIP server 530 through various paths on the network, and the receiving RoIP server 530 receives the received TCP / IP internet signal. This is converted into a wireless signal of the RS-232C protocol and transmitted to the corresponding transceiver 540.

On the contrary, a message (for example, a reception start message, a reception end message, etc.) transmitted from the reception radio 540 to the transmission radio 510 is transmitted to the reception side RoIP server 530 by the wireless RS-232C communication protocol. The RoIP server 530 on the side converts the radio signal received from the receiving radio 540 into an Internet signal based on the TCP / IP protocol and transmits it to the transmitting RoIP server 520.

The TCP / IP Internet signal converted by the receiving RoIP server 530 is transmitted to the transmitting RoIP server 520 through various paths on the network, and the transmitting RoIP server 520 transmits the received TCP / IP internet signal to the RS. Converts to a -232C protocol wireless signal and transmits it to the corresponding transmission transceiver 510.

Meanwhile, a message transmitted by each transmitting radio or a receiving radio on the system for providing a RoIP service according to the present invention may be set as shown in Table 1 according to an embodiment of the present invention.

Command Description Command Data Direction Rx In "RoIPRS" + Check-Sum Radio-> RoIP Rx OFF "RoIPRE" + Check-Sum Radio-> RoIP Tx Start "RoIPTS" + Check-Sum RoIP-> Radio Tx End "RoIPTE" + Check-Sum RoIP-> Radio Channel Change "RoIPCH" + Group + CH + Check-sum RoIP-> Radio Squelch Level Change "RoIPSQ" + Squelch Level + Check-sum RoIP-> Radio Tx Power Change "RoIPCH" + Tx Power Level + Check-sum RoIP-> Radio

Referring to <Table 1>, the receiving radio 540 transmits a 'Rx In' message indicating the start of receiving a message and a 'Rx OFF' message indicating the end of receiving the message to the RoIP server. . In this case, it is preferable to add a 'Check-Sum' bit for parity check of data to the LSB (Least Significant Bit) of each message data.

At this time, when the RoIP server receives the 'Rx In' message from the receiving radio, the transmitting radio transmits a 'Tx Start' message to the corresponding transmitting radio so that the transmitting radio can start transmitting the voice message. In addition, when the RoIP server receives the 'Rx OFF' message from the receiving radio, the transmitting radio transmits a 'Tx End' message to the corresponding transmitting radio so that the transmitting radio can terminate the transmission of the voice message.

Meanwhile, according to an embodiment of the present invention, an additional function of a service may be provided by transmitting a message including various commands in a RoIP service providing process. For example, the transmission channel of the message can be changed by transmitting a 'Channel Change' message from the RoIP server to the corresponding radio. The channel change message includes a command (RoIPCH) indicating that the message is a channel change message, a channel group to be changed (for example, 1 byte), and a channel to be changed in the channel group (for example, 1 byte). It is preferable to include information, such as).

In addition, the reception sensitivity of the transmission data can be changed by transmitting a 'Squelch Level Change' message from the RoIP server to the corresponding radio. The reception sensitivity change message may include a command (RoIPSQ) indicating that the message is a message for changing reception sensitivity, and information such as a reception level to be changed.

The reception sensitivity level generally means a state in which a weak signal is received and a noisy signal is received. At this time, it may not be possible to check the voice clearly due to noise contrast. On the contrary, as the numerical value increases, the receiver receives only a clear reception sensitivity and does not know a relatively clean voice signal, but the weak signal is filtered to shorten the reception communication distance. Therefore, the RoIP server can set the optimal reception sensitivity by changing the reception sensitivity level.

In addition, the size of the transmission power of the transmission data can be changed by transmitting a 'Tx Power Change' message from the RoIP server to the corresponding radio. The transmit power change message may include a command (RoIPTP) indicating that the message is a message for changing the transmit power, and information such as a transmit power level (Tx Power Level) to be changed. As described above, the RoIP server may measure the radio state by measuring a reception power of a signal transmitted from each radio and, if the magnitude of the received signal is small, increase the transmission power level of the radio. .

Hereinafter, a procedure for providing a radio communication service using a RoIP through a transmission message with the RoIP server described above in the radio will be described.

6 is a transmission routine in a transmission radio, and FIG. 7 is a reception routine in a reception radio.

Referring to FIG. 7, when a transmission transceiver user pushes a PTT button (S702) according to a transmission routine (S701) in a transmission transceiver, a subtone ID code as shown in Table 2 is transmitted (S703).

Preamble Start Code Commnad Rx ID Tx ID 8 bit 1 bit 0x01 987654 123456

At this time, the receiving radio detects the message and transmits the above-mentioned 'Rx In' message to the RoIP server. The RoIP server transmits a transmission start message (Tx Start) to the receiving radio.

Accordingly, the transmitting radio receives the transmission start message (S603), and then transmits voice communication data to the wireless space (S604). The transmitted voice communication data is transmitted to the RoIP server by a communication protocol such as wireless RS-232C. The RoIP server converts the received data into TCP / IP Internet data according to an embodiment of the present invention.

The converted data is transmitted to the RoIP server on the receiving side through the Internet network, and the receiving RoIP server converts the received TCP / IP Internet data into wireless data of the wireless RS-232C protocol and transmits the received data to the receiving radio.

On the other hand, when the PTT button is released (S605) in the transmission radio, the transmission end code as shown in Table 3 is transmitted to the reception radio (S705).

End code 25 bit (8ms × 25bit = 200ms)

At this time, the receiving radio receiving the code transmits the above-mentioned 'Rx Out' message to the RoIP server. The RoIP server transmits a transmission end message (Tx Stop) to the receiving radio.

Accordingly, after the transmission transceiver receives the transmission end message (S606), the transmission is terminated and switched to the reception standby mode (S607), thereby terminating the data transmission through the RoIP.

Referring to FIG. 7, when a call and an ID code transmitted from a transmitting radio are detected by the receiving radio (S702) according to a receiving routine (S701) in the receiving radio, the speaker of the receiving radio is turned on (S703). The reception start message Rx In is transmitted to the RoIP server (704). Then, the voice communication data transmitted from the transmission radio is received (S705) and output to the speaker.

Subsequently, the voice signal transmitted in the form of a message from the transmitting radio is output through the speaker of the receiving radio. When the communication end code as shown in Table 3 is detected (S706), the speaker is turned off (S707) and received. The end message (Rx Out) is transmitted to the RoIP server (S708). Accordingly, the reception radio ends the reception and is switched to the reception standby mode (S709).

As such, by converting a wireless signal into a TCP / IP protocol Internet signal through a network radio and a RoIP server, an instant call with a user can be made through a TCP / IP network without a separate communication fee with a remote radio.

By using the digital subtone, it is possible to provide various additional services according to the RoIP-based communication service, such as channel change, reception sensitivity level change, and transmission power level change.

On the other hand, in the embodiment of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

101, 102, 201, 202: repeater
111, 112, 113, 114, 115, 211, 212, 213: network radio
400: data format 401: preamble
402: start code 403: command code
404: receiving terminal ID 405: transmitting terminal ID
510: transmit radio 520: sender RoIP server
530: receiving side RoIP server 540: receiving radio

Claims (10)

A transmission radio which converts a voice signal input through a microphone into a wireless data signal of a wireless RS-232C protocol and transmits it to a wireless space through an antenna;
A transmitting RoIP server for converting wireless data of a wireless RS-232C protocol transmitted from the transmitting radio into TCP / IP Internet data;
A receiving RoIP server for receiving the converted Internet data from the transmitting RoIP server through an internet network and converting the converted Internet data into a wireless RS-232C wireless data signal; And
A receiving radio receiving a wireless data signal of a wireless RS-232C protocol outputted from the receiving side RoIP server, converting the received wireless data signal into a voice signal and outputting it to a speaker;
The receiving radio,
When receiving a pilot tone signal from the transmitting radio, transmit a reception start message to the receiving side RoIP server,
The sender RoIP server,
When receiving the reception start message at the receiving side RoIP server, the radio communication system between the radio using a RoIP, characterized in that for transmitting the transmission start message.
delete delete The method of claim 1, wherein the receiving radio,
And receiving a communication end detection code from the transmitting radio, transmitting a reception end message to the receiving RoIP server.
The method of claim 4, wherein the transmitting RoIP server,
When receiving the reception end message from the receiving side RoIP server, the radio between the radio transmission system using a RoIP, characterized in that for transmitting a transmission end message.
The method of claim 1, wherein the transmitting RoIP server,
And transmitting a message selected from among a channel change message, a signal sensitivity level change message, and a transmission power change message to the transmission radio.
Transmitting a pilot tone signal to a receiving radio upon pressing the PTT button on the transmitting radio;
Transmitting a reception start message from a receiving radio to a receiving RoIP server;
Transmitting a transmission start message from the transmitting RoIP server to the transmission radio by receiving the reception start message at the receiving RoIP server;
Converting a voice signal input through a microphone into a wireless data signal of a wireless RS-232C protocol and transmitting it to a wireless space through an antenna in the transmitting radio;
Converting wireless data of a wireless RS-232C protocol transmitted from the transmitting radio into TCP / IP Internet data at the transmitting RoIP server;
Transmitting the converted Internet data at the transmitting RoIP server to the receiving RoIP server through an internet network;
Receiving the Internet data at the receiving RoIP, converting the Internet data into a wireless data signal of a wireless RS-232C protocol, and outputting the converted data;
Receiving a wireless data signal of a wireless RS-232C protocol output from the receiving side RoIP server at the receiving radio, converting the received wireless data signal into a voice signal and outputting the same to a speaker;
Transmitting a communication end code to the receiving radio as the PTT button is released by the transmitting radio;
Transmitting a reception end message from the receiving radio to the receiving RoIP server; And
And transmitting a transmission end message from the transmitting RoIP server to the transmitting radio in response to receiving a reception end message from the receiving RoIP server.
delete delete The method of claim 7, wherein the transmitting RoIP server,
And transmitting a message selected from among a channel change message, a signal sensitivity level change message, and a transmission power change message to the transmission radio.

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