JP2000183918A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use voice communication and data communication in common by enabling switching communication without performing packet multiplexing with voice by applying a carrier sense processing when one channel of radio communication device is used by plural pieces of the radio communication device. SOLUTION: When a carrier has been received by a receiving part 12, a signal is demodulated by a modulating and demodulating part 11, after that, received data are analyzed and it is decided whether it is a voice signal or not at a voice data switching part 10. When the data are the voice signal, it is outputted to a voice CODEC part 9, is decoded and the voice signal is outputted from an interface part 8. When the data are not the voice signal, the destination of the data is confirmed whether it is the present terminal or not by a packet assembling and disassembling part 17. When the destination is the present terminal, the data are fetched and it is not the present terminal, the data are cancelled. In addition, error detection is performed and the data are decided whether it is normal or not. A flag of the received data is analyzed and presence/absence of a reception confirmation request is decided by the packet assembling and disassembling part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a radio communication apparatus for transmitting packet data and voice between mobile units in, for example, a defense system.

[0002]

2. Description of the Related Art First, the use situation of this type of wireless communication apparatus will be described with reference to FIG. In FIG. 10, 1
Reference numerals a, 1b, 1c, and 1d denote battle vehicles that can move freely in the field 2, and each of them is required to transmit necessary information to any vehicle by voice or data during the operation. In addition,
Here, for convenience of explanation, a wireless communication device mounted on the battle vehicle 1a will be described. FIG. 11 is a schematic diagram showing the connection relationship of the wireless communication devices. 3 is a wireless communication device that transmits and receives voice or data, 4 is an information processing terminal that connects to the wireless communication device 3 and inputs and outputs data, and 5 is a voice communication terminal. A head transmitter / receiver for making a call, a switch 6 for switching transmission / reception of voice at hand, and an antenna 7 connected to the wireless communication device 3 for transmission / reception of radio waves. FIG. 12 is the same as the wireless communication device 3 shown in FIG. In FIG. 12, 8 represents FIG.
Interface unit having a switch and a display unit connected to the information processing terminal 4, the head transmitter / receiver 5, and the switch 6 for exchanging signals such as voice, data, transmission / reception switching signals, and various settings of the wireless communication device. It is. Reference numeral 9 denotes an audio codec unit that performs A / D or D / A conversion of an audio signal, and compresses and expands digitized audio data. 10 denotes an audio data switching unit that switches between an audio signal and a data signal. 11 denotes frequency modulation and demodulation. , A receiving unit for receiving radio waves, a transmitting unit for transmitting radio waves, a power amplifying unit for amplifying transmission power, a transmission / reception switching unit for switching between transmission and reception, a transmission power, It is a control unit that performs switching between transmission frequency, voice and data, switching between transmission and reception, and the like.

Here, a method for performing voice communication and data communication using a conventional technique will be described. For example, when performing voice communication, the switch 6 is operated (press talk),
A voice is emitted from the head transceiver 3. At this time, the switch 6
, A control signal for transmission / reception switching is input to the interface unit 8, the transmission / reception switching unit 15 enters a transmission state via the control unit 16, and a radio wave is transmitted. The audio signal output from the head transceiver 3 is decoded by the audio codec unit via the interface unit 8. The decoded audio data is modulated by the modulation / demodulation unit 11, the signal transmitted from the transmission unit 13 is amplified by the power amplification unit 14, transmitted from the transmission / reception unit switching unit 15 to the antenna 7, and transmitted to other antennas by radio waves. Sent to the communication device. In the case of transmitting data, by outputting data from the information processing terminal 4, the audio data switching unit 20 switches to data transmission,
Further, the transmission / reception switching unit 15 switches to transmission. The input data is modulated by the modulation / demodulation unit 11, the signal transmitted from the transmission unit 13 is amplified by the power amplification unit 14, transmitted from the transmission / reception unit switching unit 15 to the antenna 7, and transmitted by radio waves to another wireless communication device. Sent to. As described above, the conventional communication method has a configuration in which data communication is superior to voice communication, and data can be forcibly transmitted even during a voice call.

[0004] For this reason, since data is transmitted even during voice communication, there is a problem that voice communication is interrupted during data transmission. Furthermore, voice communication must be controlled by human judgment so that voice is not transmitted from another wireless communication device during data transmission. Further, in order to avoid these problems, when voice communication and data communication are respectively performed by providing dedicated radios, two radios are required, which increases the installation space and the number of channels used. Was.

[0005] Further, in the defense system, from the viewpoints of durability and facility development, unlike a private car telephone, etc., communication is frequently performed between mobiles directly in a broadcast format without passing through a base station. The transmission rate is optimized for the coding rate of the speech codec, and is often a low bit rate of 16 kbps or less per channel. Therefore, it has been difficult to transmit the voice communication and the data communication by packet multiplexing.

In a private communication system, a PRMA (Packet Reserver) that performs multiple access on a time-division multiplexed frame of a voice packet and data as a wireless communication device that realizes communication in which voice and data are integrated.
Tion Multiple Access) (D.J.
Goodman and X. Wei, Efficie
ncy of Packet Reservation
Multiple Access, IEEE. Tran
s. Veh. Technol. , Vol. 40, No
1, 1991), and the paper "Analysis of slotted CDMA system in PCN integrating voice and data" (Goichi Take, Yutaka Matsumoto, IEICE Technical Report, RCS98-9,
pp 65-72, 1998-04),
PCN (Personal Communication)
n Networks) and CDMA (Code Div)
There has been proposed an apparatus using packet communication of an ion multiple access (code division multiple access) method. However, these communication systems are based on a cellular system that requires a base station, and communication between mobile stations cannot be realized without the intervention of a base station. Further, the communication path is a full-duplex communication path, and a signal transmission rate is required to be several tens or more times higher than a voice data rate in order to multiplex signals.

[0007]

In the above-mentioned conventional communication between fighting vehicles, data is transmitted during a voice call.
The voice call was interrupted on the way, and it was difficult to establish sufficient voice communication. Further, since the application of the technology of the private communication system is based on the cellular system, there is a problem that it cannot be applied to a peer-to-peer communication system which does not require a base station. In addition, there is a problem that a transmission path sufficiently fast with respect to the voice data rate must be secured. Therefore, in a communication system in which mobile units directly transmit data at a transmission rate equivalent to the data rate of voice, it has been difficult to packetize a voice signal and multiplex and transmit it with data.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and exclusively outputs voice and data, and automatically recognizes and receives the voice and data, thereby enabling voice communication and data communication. The purpose is to share.

[0009]

The radio communication apparatus according to the first invention, when one channel is shared by three or more radio communication apparatuses, uses a carrier sense process to transmit voice and data. Switching communication can be performed without packet multiplexing.

[0010] Further, a wireless communication apparatus according to a second aspect of the present invention includes:
When a voice call occurs during data communication, head information of a voice signal is not output, and data collision at the start of a voice call is reduced.

Further, a wireless communication apparatus according to a third aspect of the present invention includes:
By providing a circuit for delaying the transmission of voice data when a voice call occurs during data communication, data collision at the start of a voice call is reduced.

[0012] Further, a wireless communication apparatus according to a fourth aspect of the present invention includes:
By providing a circuit that detects the reception power level of voice data and controls the transmission power of data so that data can be received at a reception power higher than that level, when data collide at the start of a voice call due to a supplementary effect But
It is designed to receive data.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing Embodiment 1 of the present invention.
Reference numeral 16 is the same as the conventional wireless communication device. Reference numeral 17 denotes a packet assembling / disassembling unit for assembling and disassembling a packet;
Is an access control unit that performs data transmission control and retransmission processing. In the above embodiment, the wireless communication apparatus is one unit.
Further, a configuration in which the access control unit 18 is separated is also possible.

The operation of the wireless communication device 3 configured as described above will be described. FIG. 2 is a flowchart showing the flow of the receiving operation in the present invention, and FIG. 4 is a flowchart showing the flow of the transmitting operation in the present invention.

Each wireless communication device 3 is in a receiving state at all times when it is not transmitting, and is intercepting other wireless communication devices communicating with each other. When the receiving unit 12 receives the carrier, the modem unit 11 demodulates the signal, and the audio switching unit 12 analyzes the received data to determine whether or not it is an audio signal (step 101). In the case of an audio signal, data is output to the audio codec 8 and decoded (step 10).
2) An audio signal is output from the interface unit 8 (step 103).

If the data is not a voice signal, the packet assembling / disassembling unit 17 checks whether the destination of the data is the terminal itself (step 104). If it is its own terminal, it fetches the data (step 105); otherwise, it discards the data (step 106). Further, error detection is performed, and it is determined whether or not the data is normal (step 107). The packet assembling / disassembling unit 17 analyzes the flag of the received data to determine the presence or absence of a reception confirmation request (step 108). The access control unit 18 transmits ACK when no error is detected and there is a reception confirmation request (step 109), and outputs data from the interface unit 8 without transmitting ACK when there is no reception confirmation request. (Step 110).

When each wireless communication device 3 transmits a signal, data is input to the packet assembling / disassembling unit 17 or
Alternatively, when an audio signal is input to the audio codec 9, processing is executed. In the case of an audio signal (step 201),
The data is encoded by the audio codec 9 (step 202), modulated by the modulator / demodulator 11, and the signal transmitted from the transmitter 13 is amplified by the power amplifier 14 and transmitted from the transceiver switch 15 to the antenna 7. It is transmitted (step 203). At this time, even when data is being transmitted and received, the audio data switching unit 10 switches to audio output when the audio signal is input, and the transmission / reception switching unit 15 enters the transmission state.

If the signal is not an audio signal (step 20)
1) When the data is input, the packet is disassembled by the packet assembling / disassembling unit 17 and stored in the memory. The access control unit 18 performs carrier sense on whether the receiving unit 12 is receiving a signal (step 204) and determines whether transmission is possible (step 205). If transmission is possible, the packet assembling / disassembling unit 17 transmits data in response to the reception confirmation request (steps 207 and 20).
8).

If a reception acknowledgment request is transmitted during this transmission, the transmission waits for a predetermined time after transmission, and if no acknowledgment code (ACK) is transmitted within that time (step 209), the backoff is performed. According to the algorithm,
The transmission content stored in the access control unit 12 is retransmitted (step 211). When a time-over such as exceeding the allowable number of retransmissions in data transmission occurs (step 210), a transmission error is notified from the interface unit 8 (step 212).

Embodiment 2 FIG. 4 is a block diagram showing Embodiment 2 of the present invention. In the drawing, reference numerals 8 to 18 are the same as those in the apparatus shown in FIG. In the figure, reference numeral 19 denotes a voice for performing processing for not outputting the initial data of the voice signal input from the interface unit 8 to the voice codec 9 for a certain period of time when the packet disassembly / assembly unit 17 determines that packet data is being transmitted / received. Output control unit. The audio output control unit 19 also controls transmission switching of the transmission / reception switching unit 15 in accordance with the audio output. In this case, the head part of the voice is not transmitted by the processing of the voice output control unit 19, but in the press talk method used in the voice communication of the half-duplex communication path, a certain time is required from the transmission operation (press) to utterance. , The leading portion of the voice is almost silent, and the effect of truncation is small. Further, even when the head is cut off, it is not a problem since the prediction can be made by complementing the receiver.

Here, the effect of providing the audio output control unit 19 will be described. In the wireless communication apparatus described in the first embodiment, since an audio signal is transmitted during data transmission and reception, packet data and audio data may collide as shown in FIG. For this reason, the audio output control unit 19 partially restricts the output of the audio, so that the audio data is not transmitted during the time when the audio data is originally transmitted. As shown in FIG. Can be avoided.

Embodiment 3 FIG. FIG. 7 is a block diagram showing Embodiment 3 of the present invention. In the drawing, reference numerals 8 to 18 are the same as those in the apparatus of FIG. When the packet disassembly unit 17 determines that packet data is being transmitted and received, the compressed audio data output from the audio codec unit 9 is temporarily stored in a temporary memory, and a delay process for a predetermined time is performed. An audio delay unit that outputs to the data switching unit 10. The audio delay unit also controls the transmission switching of the transmission / reception switching unit 15 in accordance with the above-described audio output delay processing.
Also in this case, it is possible to obtain the same effect as in the second embodiment.

Embodiment 4 FIG. 8 is a block diagram showing Embodiment 4 of the present invention. In the drawing, reference numerals 8 to 18 are the same as those in the apparatus of FIG. Reference numeral 21 denotes a voice reception power level calculated from the reception power level received by the reception unit 12 and the operation status of the packet assembling / decomposing unit 17, and based on the reception power level, a preset optimal transmission power level is set. A transmission output control unit that controls the power amplification unit 14 to transmit packet data. In mobile communication, the received power level changes every moment due to fading and fluctuations in the communication distance, so the reception level control unit sequentially calculates the average received power level per unit time, and performs transmission that follows the change in the average received power level. Perform power control.

For example, if packet data that is 10 dB stronger than the received power level of the audio signal is received, a supplementary effect (capture effect) occurs in which the audio signal is canceled and only the packet data can be received. By optimally controlling the power level, it becomes possible to receive packet data even when packet data and voice data collide as shown in FIG.

[0025]

According to the first aspect, shared communication of voice communication and data communication can be realized even when one channel is shared and used by three or more wireless communication devices.

Further, according to the second aspect of the present invention, it is possible to reduce the collision between the voice data and the packet data as compared with the first aspect of the present invention by not transmitting the initial signal of the audio signal. Can be improved.

According to the third aspect of the invention, by allowing transmission delay of the audio signal, it is possible to reduce the collision between the audio data and the packet data as compared with the first aspect of the invention, and to improve the data throughput. Can be achieved.

Further, according to the fourth aspect, even when voice data and packet data collide, packet data can be received, and the data throughput can be improved as compared with the first aspect. .

[Brief description of the drawings]

FIG. 1 is a first embodiment of a wireless communication apparatus according to the present invention;
FIG.

FIG. 2 is a flowchart showing a flow of a receiving operation in the present invention.

FIG. 3 is a flowchart showing a flow of a transmission operation in the present invention.

FIG. 4 is a second embodiment of a wireless communication apparatus according to the present invention.
FIG.

FIG. 5 is a diagram illustrating a collision situation between packet data and voice data.

FIG. 6 is a diagram illustrating how to avoid a collision situation between packet data and voice data.

FIG. 7 is a wireless communication device according to a third embodiment of the present invention;
FIG.

FIG. 8 is a fourth embodiment of a wireless communication apparatus according to the present invention.
FIG.

FIG. 9 is a diagram illustrating a collision situation between packet data and voice data in Embodiment 4 of the present invention.

FIG. 10 is a diagram illustrating a usage state of a wireless communication device.

FIG. 11 is a schematic diagram showing a connection relationship of a wireless communication device.

FIG. 12 is a diagram showing an embodiment of a conventional wireless communication device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 combat vehicle, 2 outdoor, 3 wireless communication device, 4 information processing terminal, 5 head transceiver, 6 switch, 7 antenna, 8 interface unit, 9 audio codec unit, 10 audio data switching unit, 11 modem unit, 12
Receiving unit, 13 transmitting unit, 14 power amplifying unit, 15 transmission / reception switching unit, 16 control unit, 17 packet assembling / disassembling unit,
18 access control unit, 19 audio output control unit, 20
Voice delay section, 21 transmission level control section, 101 voice signal determination, 102 decoding processing, 103 voice output, 104 destination own terminal determination, 105 data capture, 106 data discard, 107 error detection, 108
Judgment of presence / absence of reception confirmation request, 109 ACK transmission, 110 data output, 111 error processing, 201 audio signal judgment,
202 encoding process, 203 voice transmission, 204
Carrier sense, 205 transmission permission / inhibition determination, 206 transmission confirmation request presence / absence determination, 207 data transmission, 208 data transmission, 209 ACK confirmation, 210 time over determination, 211 retransmission processing, 212 transmission error processing.

Claims (4)

[Claims] An interface unit for inputting / outputting a signal to / from a device having a unit for inputting / outputting voice and data, and an audio signal output from the interface unit being transmitted to an A
An audio codec unit for performing / D conversion and compressing the audio digital signal or performing an inverse conversion thereof, an audio data switching unit for switching between an audio signal to be transmitted and received and a data signal,
A modulation / demodulation unit that performs frequency modulation and demodulation, a reception unit that receives a radio wave, a transmission unit that transmits a radio wave, a power amplification unit that amplifies an output signal of the transmission unit, and a transmission / reception switching unit that switches between transmission and reception. A control unit for controlling transmission power, transmission frequency, switching between voice and data, switching between transmission and reception, a packet assembling / disassembling unit for assembling and disassembling a packet of transmission / reception data, and a data transmission control and retransmission process. A wireless communication device comprising an access control unit for performing the operation. 2. The wireless communication apparatus according to claim 1, further comprising an audio output control unit that performs processing for not outputting a head signal of the audio signal input from the interface unit to the audio codec unit for a predetermined time. 3. The wireless communication system according to claim 1, further comprising an audio delay unit that stores compressed audio data output from the audio codec unit in a memory, performs a delay process for a predetermined time, and outputs the processed audio data. Communication device. 4. A voice reception power level is calculated from a reception power level received by the reception unit and an operation state of the packet disassembly / reassembly unit, and a data transmission power level is controlled based on the reception power level information. The wireless communication device according to claim 1, further comprising a transmission level control unit.