JPH11251998A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce voice breaks caused by hand-over at the time of communication by voice/data simultaneous communication. SOLUTION: At the time of the voice/data simultaneous communication, when a radio channel state detection part 112 detects the occurrence of the hand-over, a communication mode changeover request/confirmation data transmission part 113 transmits a communication mode changeover request to an opposite party. When the reception from the opposite party of communication mode confirmation is detected in a communication mode changeover request/ confirmation data detection part 114, through a PDC control command processing part 1051, the communication mode of a PDC 102 is switched to a voice communication mode. In the opposite party, the communication mode changeover request/confirmation data transmission part 113 which detects the communication mode request similarly switches the voice communication mode and the communication mode changeover request/confirmation data transmission part 113 is made to transmit communication mode changeover confirmation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to voice / data communication in which voice communication is performed by a wireless communication device such as a digital cellular phone in a voice communication mode, and voice data and non-voice data are simultaneously transmitted in a non-voice data communication mode. The present invention relates to a technique for switching between a voice communication mode and a non-voice data communication mode in a communication device that performs simultaneous communication.

[0002]

2. Description of the Related Art Conventionally, a wireless communication line has been established by interposing a wireless communication device such as a digital mobile phone (hereinafter referred to as "PDC") or a simplified mobile phone and a data terminal such as a personal computer. 2. Description of the Related Art There is known an adapter device which enables non-voice data communication.

Further, as described in, for example, the Journal of the Institute of Electronics, Information and Communication Engineers, P590, 1997, a voice input / output device and a data terminal are interposed between a portable telephone and a non-voice data communication mode. There has also been proposed an adapter device that realizes simultaneous voice / data transmission in which voice and non-voice data are simultaneously transmitted by transmitting data in a mixed manner.

Hereinafter, a communication device including an adapter device for performing such voice / data simultaneous communication will be described.

FIG. 8 shows the configuration of a communication device.

In the figure, reference numeral 101 denotes a simultaneous transmission adapter;
The simultaneous transmission adapter 101 includes a PDC 102, a data terminal 103 such as a personal computer, a voice input device 1041 such as a microphone, and a voice output device 104 such as a speaker.
2 are connected.

In the simultaneous transmission adapter 101,
Reference numeral 105 denotes a PDC interface processing unit.
A C interface processing unit 105 controls the operation of the PDC 102, such as an outgoing / incoming call and the start and end of non-voice data communication, and is transmitted and received between the PDC 102 and the simultaneous transmission adapter 101 in the non-voice data communication mode. Data transmission / reception unit 105 for taking in TCH data into simultaneous transmission adapter 101 and sending out TCH data from simultaneous transmission adapter 101 to PDC 102
Consists of two.

[0008] The specifications of signals and commands input and output between the PDC 102 and the simultaneous transmission adapter 101, the start and end sequences of outgoing / incoming calls and non-voice data communication, and the like are defined in the Digital Cellular Phone Common Specification A by the Digital Cellular Phone Standardization Committee. It is standardized, and the PDC interface processing unit 105 performs processing according to this standard.

In accordance with this standard, by inputting predetermined PDC control command data from the simultaneous transmission adapter 101 to the PDC 102, control such as outgoing and incoming calls of the PDC 102 and transition to the non-voice data communication mode is performed.
These PDC control commands input to the PDC 102 are called uplink serial signals.
Off-hook, dialing, non-telephone service request ON /
There is a command such as OFF.

On the other hand, the PDC 102 has its own status, a status command indicating a response from the base station, for example, ON / OFF during call display, non-telephone service confirmation O
A status command such as a response command such as N / OFF and tone type is output to the simultaneous transmission adapter 101.
These response commands output from the PDC 102 are called downlink serial signals.

The PDC control command processing unit 102 controls the PDC 102 by transmitting the upstream serial signal and analyzing the downstream serial signal according to a prescribed sequence.

Next, in the figure, reference numeral 106 denotes a data terminal interface unit for performing signal level conversion and the like of transmission / reception signals between the data terminal 103 and the simultaneous transmission adapter 101.

In the figure, reference numeral 108 denotes a data terminal 103.
This is an AT command processing unit that performs command processing for adapter control from the server. The command for controlling the adapter is P
The command system is different from the DC control command, and is used for controlling a modem device used in personal computer communication or the like.
A control command called a command is generally used as an adapter control command. In this case, the data terminal 103 sends the simultaneous transmission adapter 10
1 A command for setting internal functions, a command for making a call, an incoming call, and a transition to a non-voice data communication mode, and the like are sent to the simultaneous transmission adapter 101. The AT command processing unit 108 analyzes the adapter control command sent from the data terminal 103, and notifies the PDC control command processing unit 1051 of the PDC interface processing unit 105 of the analysis result. On the contrary, the PDC control command processing unit 1051
Receives the result of analyzing the status command received from the PDC 102, and sends a status command corresponding to the result to the data terminal 103.

For example, when making a call, the data terminal 1
03 to the dialing command (AT command uses AT
D) to the simultaneous transmission adapter 101. In this case, AT
The command processing unit 108 analyzes the input AT command, and notifies the PDC control command processing unit 1051 of a dialing instruction as an analysis result. Upon receiving the dialing instruction, the PDC control command processing unit 1051 first sends an off-hook command using an uplink serial signal. Then, the PDC 1 waits for a dial tone command with a downlink serial signal, and then receives a dial number command with an uplink serial signal.
02 calling processing is performed.

Next, in the figure, reference numeral 107 denotes a communication mode determination unit, which determines the mode in the simultaneous transmission adapter 101 according to the communication state of the PDC 102, and performs the following processing according to the mode.

The modes in the simultaneous transmission adapter 101 include an offline command mode in which the PDC 102 is not in communication, a voice communication mode in which voice communication is performed, a non-voice data communication mode in which non-voice data communication is performed, and a non-voice data communication. There is an online command mode for controlling the operation of the PDC 102 during the mode.

The communication mode determining unit 107 manages these modes, and switches the destination of data sent from the data terminal 103 via the data terminal interface processing unit 106. In the offline and online command modes and the voice communication mode, no data is transmitted on the wireless communication line, so all data from the data terminal 103 is sent to the AT command processing unit 108 via the data terminal interface processing unit 106. Then, in the non-voice data communication mode, data from the data terminal 103 is transmitted to a communication partner via a wireless line, so that the data is transmitted to the non-voice data processing unit 109 described below.

Next, reference numeral 108 in the figure denotes a non-voice data processing unit 108, which is connected to the data terminal 1 via the data terminal interface processing unit 106 in the non-voice data communication mode.
The predetermined processing is performed on the non-speech data received from the non-speech data received from the non-speech data processing section 111, and the predetermined processing is performed on the non-speech data transmitted from the simultaneous speech and data processing section 111. Processing such as sending to the data terminal 103 via the data terminal interface processing unit 106 is performed.

More specifically, the non-voice data processing unit 108
Is a process of assembling and disassembling a communication data packet according to a communication data format transmitted and received on a wireless communication line, a communication procedure establishing process for establishing non-voice data communication between the PDC 102 and the PDC base station, and a retransmission. It performs error processing such as control. Here, a wireless communication line establishment procedure, a communication data format, and an error correction method used for data communication using the PDC 102 include, for example,
RCR STD-27 issued by Radio System Development Center
D digital car phone system standards.
In this case, the non-speech data processing unit 108 performs data processing according to this standard.

In the figure, reference numeral 110 denotes a voice data processing unit which performs predetermined processing on voice received from the voice input / output unit 104 in the voice communication mode and the non-voice data communication mode to perform voice / data Simultaneous communication processing unit 111
And performs predetermined processing on the audio data sent from the simultaneous audio / data communication processing unit 111 and outputs the processed audio data to the audio input / output unit 104. Here, the audio data processing unit 110 specifically, as the predetermined processing,
A predetermined standard (for example, RCR STD-27 described above)
A series of audio data processing according to D) is performed. To perform this process, the audio data processing unit 110 converts the audio signal input from the audio input device 1041 into an A /
An audio codec that performs D conversion, compression coding of transmission audio data, and decompression decoding of reception audio data,
A D / A converter that converts audio data decompressed by the audio codec into an analog signal and outputs the analog signal to the audio output device 1042 is provided.

Next, in the figure, reference numeral 111 denotes a voice / data simultaneous communication processing unit.

FIG. 9 shows a TCH signal exchanged between the PDC 102 and the simultaneous transmission adapter 101 in the non-voice data communication mode.

In the non-voice data communication mode, the PDC 102 outputs to the simultaneous transmission adapter 101 a TCH frame signal (1) having a period of 20 ms and a TCH clock (2) in which a 42 kHz clock is intermittent as shown in FIG. P
Between the DC 102 and the simultaneous transmission adapter 101, the synchronization is performed in synchronization with the TCH frame (1) and the TCH clock (2).
Transmission and reception of TCH data are performed in units of 4 bits. PD
The data to be transmitted from the C102 to the wireless line is the TCH transmission data (3) from the simultaneous transmission adapter 101 to the PDC 102.
And sent from the wireless line to the PDC10
2 receives data from the PDC 102 at the timing described in the TCH received data (4).
Sent to 1.

In the voice / data communication mode, the voice / data simultaneous communication processing unit 111 transmits the voice data received from the voice data processing unit 110 to the PDC 102 via the TCH data transmitting / receiving unit 1052 every 40 ms.
TCH data transmission / reception unit 105 every 40 ms from C102
Then, the received audio data is sent to the audio data processing unit via the communication unit 2. On the other hand, in the non-voice data communication mode, the non-voice data received from the non-voice data processing unit 109 and the voice data sent from the voice data processing unit 110 are transmitted for 20 ms.
Via the TCH data transmission / reception unit 1052 alternately every time
Send to DC102 and 20m from PDC102
The non-voice data and the voice data alternately transmitted are received via the TCH data transmission / reception unit 1052 for each s,
By discriminating both, the non-voice data is processed by the non-voice data
To the audio data processing unit.

By communicating in a non-speech data communication mode via a radio communication line via a base station (not shown) between two communication devices having such a configuration as shown in FIG. Simultaneous voice / data communication in which non-voice data is exchanged between the data terminals 102 and 403 and voice is exchanged between the voice input / output units 104 and 404 becomes possible.

[0026]

One of the features of the PDC is that it can continue communication while moving. The continuation of this communication is performed by changing the communication area covered by the base station that has established the connection of the wireless communication line to
When C comes off due to movement, an operation called handover for reconnecting a wireless communication line between the PDC and a base station (a base station with a better line condition) that also covers a communication area covering the destination of the PDC It is realized by.

At the time of such a handover, it is inevitable that the voice during the call is temporarily interrupted due to the switching of the radio communication line. However, in the case of the voice communication mode, the PDC continues to communicate with the base station that has established the wireless communication line until a new wireless line connection is established with the base station. For this reason, in the case of the voice communication mode, the interruption of the voice due to the handover is minimized.

On the other hand, when communication is being performed in the non-voice data communication mode, at the time of handover, communication with the base station which has established a wireless communication line up to that point is not continued. For this reason, as described above, when simultaneous voice / data communication is performed in the non-voice data communication mode, the sound interruption at the time of handover is longer than in the case where a telephone call is performed in the voice communication mode. For this reason, if base station switching occurs frequently, or if the time required to establish a new wireless line becomes longer because there is no free line at the destination base station, sound interruptions occur more frequently, It is possible that communication may not be possible in practice.

Therefore, it is an object of the present invention to reduce interruption of sound at the time of handover in simultaneous voice / non-voice data communication in the non-voice data communication mode.

[0030]

In order to achieve the above object,
A voice communication that transmits voice data in a voice communication mode by connecting to a mobile communication network having a plurality of radio base stations via a radio communication device that dynamically selects and connects one radio base station. A communication mode switching method in a communication device for realizing simultaneous voice / data communication in which a voice data and a non-voice data are simultaneously transmitted in a non-voice data communication mode, wherein transmission of voice data between the communication device and a communication device of the other party is not performed. Simultaneous voice / data communication in non-voice data communication mode with a means for detecting the presence of a communication state in a state where communication cannot be performed normally or in a state where normal communication will not be performed. The communication state is set to a state where transmission of voice data with the communication device of the other party cannot be performed normally or a state where the transmission of audio data will not be performed normally. When detecting that there is, in cooperation with the other party's communication device, the communication mode with the other party's communication device is switched from non-voice communication mode communication to voice communication mode communication. Provide a switching method.

According to such a communication mode switching method, when the transmission of voice data to or from the communication apparatus of the other party cannot be performed normally, or when it becomes impossible to perform transmission normally Since the non-voice communication mode can be automatically switched to the voice communication mode, it is possible to reduce the interruption of the sound at the time of the handover described above.

It is to be noted that the detection of the presence of a communication state in a state where the transmission of voice data between the other party's communication device cannot be performed normally or a state in which the data cannot be performed normally can be detected, for example, by handover. To detect the occurrence of
This can be performed, for example, by detecting that the degree of error of the received audio data has exceeded a predetermined non-permissible level.

[0033]

Embodiments of the present invention will be described below.

First, a first embodiment will be described.

FIG. 1 shows the configuration of the communication device according to the first embodiment.

As shown in the figure, the communication apparatus according to the present embodiment is connected to the simultaneous transmission adapter 101 of the communication apparatus (see FIG. 8) described in the section of "Prior Art" earlier, by the wireless line state detection unit 1052, Communication mode switching request / confirmation data sending unit 113, communication mode switching request confirmation data detection unit 1
14 is added. The other parts are the same as the parts described earlier with the same reference numerals in the communication device of FIG.

Now, the radio line state detection unit 112 detects the occurrence of a handover.

Here, when a handover occurs, the PDC 102 outputs a response command from a specific base station to the simultaneous transmission adapter 101 as a downlink serial signal. The PDC control command processing unit 1051 in the PDC interface processing unit 105 receives command data transmitted by a downlink serial signal, analyzes the command, and performs processing corresponding to the command. PDC control command processing unit 1
051 provided by the wireless line state detection unit 112
When analyzing a command received by the downlink serial signal of the C control command processing unit 1051, a response command at the time of handover transmitted from the PDC 102 is detected.

When detecting the handover, the wireless line state detecting unit 112 detects the handover, and the simultaneous transmission adapter 101 performs processing for switching the communication mode.

First, before describing the communication mode switching processing in the present embodiment, a conventional communication mode switching procedure will be described with reference to FIG.

The conventional communication mode switching has been performed according to the above-described standard in the sequence shown in FIG.

That is, first, an escape command is transmitted from the data terminal 103 in order to shift to an online command mode in which a command for controlling the simultaneous transmission adapter 101 can be input during non-voice data communication.
Generally, a transition is made to the online command mode by inputting "+" three times to the simultaneous transmission adapter 101 at a predetermined timing. When the communication mode determination unit 107 detects that the online command mode has been entered, the communication mode determination unit 107 switches the transmission data path so that the next data from the data terminal 103 is transmitted to the AT command processing unit 108.

Next, the data terminal 103 is connected to the adapter 101
Sends an AT command for mode switching.
When receiving the AT command for mode switching, the AT command processing unit 108 changes the PDC control command processing unit 1051 from non-voice data communication to voice data communication.
To the PDC control command processing unit.
The command data of the non-telephone service request OFF defined by the standard is transmitted to an upstream serial signal.

In response, PDC 102 issues a non-telephone communication OFF request message to the base station. Then, when receiving the response message of modem inactivity from the base station side, the PDC 102 sends a non-telephone service confirmation OFF response command to the simultaneous transmission adapter 101 as a downlink serial signal. PDC control command processing unit 1051
Receives the non-telephone service confirmation OFF, and determines that the PDC 102 is in the voice communication mode by the communication mode determination unit 107.
Inform The communication mode determination unit 107 changes the mode of the simultaneous transmission adapter 101 to the voice communication mode.

The communication partner also switches from the non-speech data mode to the speech communication mode in the same manner, so that the communication in the speech communication mode becomes possible.

Hereinafter, switching processing of the communication mode in the simultaneous transmission adapter 101 according to the present embodiment will be described.

FIG. 3 shows a communication mode switching sequence in the present embodiment.

Communication mode switching request / confirmation data sending section 1131 sends predetermined switching request data to non-speech data processing section 109 and communication mode switching when radio line state detecting section 112 detects handover. The communication mode switching confirmation data waiting mode is set in the request / confirmation data detection unit 114. Non-voice data processing unit 10
9 configures a packet in which the switching request data is included in the user data section and transmits the packet to the communication partner.

Here, the format of the data packet when performing non-voice data communication by the PDC differs depending on the communication speed. However, when performing the simultaneous voice / data communication at the conventional 9600 bps communication speed, the format of the data packet is as follows. , Shown in FIG. As shown in the figure, the data packet includes the backward control information used in the 9600 bps communication error processing, the forward control information, the flag indicating the user data length and the type of forward information, the CRC error detection code, and the user data communication during non-voice data communication. , Which comprises forward channel information used for One packet is 224 bits.
In the present embodiment, by storing predetermined communication mode switching request data and communication mode switching confirmation data described later in the forward channel information shown in FIG.
The communication mode switching request / confirmation data is transmitted.

Now, in the simultaneous transmission adapter 101 on the other side which has received the packet including the switching request data, the non-voice data processing unit 109 performs a reception process on the packet to extract the data of the forward channel information.
The data is sent to the communication mode switching request / confirmation data detection unit 114. Communication mode switching request / confirmation data detection unit 1
When detecting that the received data includes the communication mode switching request data, the 14 notifies the communication mode switching request / confirmation data sending unit 113 of the detection. Communication mode switching request / confirmation data sending unit 11 that received the notification
3 sends predetermined switching confirmation data to the non-voice data processing unit 109. The non-voice data processing unit 109 forms a packet including the switching confirmation data in the user data unit, and transmits the packet to the communication partner. Further, the communication mode switching request / confirmation data detecting unit 114, which has detected the communication mode switching request data, sends the non-telephone service request OF to the PDC 102 via the PDC control command processing unit 1051.
F is transmitted to transit to the voice communication mode.

On the other hand, in the simultaneous transmission adapter 101 that has transmitted the switching request data, the non-voice data processing unit 10
In step 9, the packet is subjected to reception processing to extract the data of the forward channel information, and sends the data to the communication mode switching request / confirmation data detection unit 114. When the communication mode switching request / confirmation data detecting unit 114 in which the communication mode switching confirmation data waiting mode is set detects that the communication mode switching confirmation data is included in the received data, the communication mode switching request / confirmation data detecting unit 114 changes the PDC control command processing unit 1051. Then, a non-telephone service request OFF is transmitted to the PDC 102 to make a transition to the voice communication mode.

When the adapters are in the voice communication mode as described above, a call in the voice communication mode becomes possible. By arranging and processing the communication mode switching procedure in the adapter 101 in this way, if a handover occurs during a simultaneous transmission call and the voice is interrupted, the communication mode can be switched to the voice communication mode. Calls can be resumed with better voice quality. In addition, the transition from the non-voice data communication mode to the voice communication mode can be automatically, smoothly, and reliably performed by the above-described sequence.

Hereinafter, a second embodiment of the present invention will be described.

In the second embodiment, the communication mode is switched according to an error state of voice data received during non-voice data communication, instead of switching the communication mode by determining that handover has occurred based on a downlink serial signal from the PDC 102. Is what you do.

FIG. 5 shows the configuration of a communication device according to the second embodiment.

As shown in the figure, the communication device according to the second embodiment is provided with the simultaneous transmission adapter 101 of the communication device according to the first embodiment (see FIG. 1).
Is omitted and the audio data error detection unit 801 is provided.

The audio data processing section 110 performs a series of audio data processing based on the above-mentioned standard. Specifically, as processing on the transmitting side, the audio data processing unit 110
After the A / D converter performs compression processing on the digitized audio data, the audio codec adds a CRC error detection code and performs a convolutional code for error correction on the CRC encoded audio data. And an interleave process for spreading data bits. Also, as processing on the receiving side, the audio data processing unit 110
The audio codec performs an error correction process by deinterleaving and convolutional decoding of the audio data, and further performs a CRC error detection for checking the audio data for which the error could not be corrected. If no CRC error is detected, the audio data is expanded, converted into analog audio by the D / A converter, and output to the audio input / output unit 104. When an error is detected by CRC error detection, the audio codec includes a mask for audio signal reproduction,
Alternatively, by performing processing such as replaying the audio data received immediately before, processing for making audio deterioration less noticeable is performed.

In the second embodiment, the audio data processing unit 1
The state of the CRC error detected in step 10 is monitored, and if a voice data error continues for a predetermined period or more, the call in the non-voice data communication mode is switched to the call in the voice communication mode.

In FIG. 5, the audio data error detector 8
01 detects a CRC error status signal notified from the audio data processing unit 110. The audio data error detection unit 801 counts the number of times that a CRC error has occurred from the CRC error status signal, and outputs a message indicating that an unacceptable error has been detected when the number of times has exceeded a predetermined number. The CRC error is checked every 224 bits of the TCH reception data. For example, as shown in FIG. 9, when audio data is received every 40 ms, if audio interruption for 3 seconds is detected, it is detected that the error has continued 3 times / 40 ms = 75 times. The audio data error detection unit 801
The number of C errors is counted, and after a predetermined number of consecutive times, the communication mode switching request / confirmation data sending unit 113 is notified of the non-permissible error detection.

The communication mode switching request / confirmation data transmitting unit 113, which has received the notification of the detection of the non-permissible error, operates in the same manner as in the first embodiment when the wireless channel state detecting unit 112 detects a handover. The predetermined switching request data is sent to the non-voice data processing unit 109, and the communication mode switching request / confirmation data detection unit 114 is set to the communication mode switching confirmation data waiting mode. The non-voice data processing unit 109 forms a packet in which the switching request data is included in the user data unit, and transmits the packet to the communication partner.

The subsequent operations of the simultaneous transmission adapter 101 on the receiving side and the transmitting side of the switching request data are the same as those described in the first embodiment. Transition from the communication mode to the voice mode.

According to the second embodiment, the communication mode switching determination is performed in the error state of the voice data. Therefore, even if handover occurs, the communication mode is not switched if there is little voice deterioration such as voice dropout. Conversation in the non-voice data communication mode can be continued, or conversely, even if handover has not occurred, if the voice deterioration increases due to the received radio wave condition, etc., the communication mode can be switched to the voice communication mode. It becomes possible.

Hereinafter, a third embodiment of the present invention will be described.

In the third embodiment, the data terminal 103 controls the communication mode switching sequence in the first and second embodiments.

FIG. 6 shows the configuration of the communication device according to this embodiment.

The configuration shown in FIG. 6 is a configuration in which the sequence of switching the communication mode is controlled by the data terminal 103 triggered by the error detection of the voice data shown in the second embodiment. Transmission adapter 1 of the communication device (see FIG. 8) described in the section of
01 is obtained by adding an audio data error detection unit 802. The other parts are the same as the parts described earlier with the same reference numerals in the communication device of FIG.

The voice data error detector 802 monitors voice data errors in the same manner as the voice data error detector 801 described in the second embodiment. The output to the data terminal I / F unit 106 of the processing unit 109 is interrupted, and a code indicating a predetermined voice data error, for example, “VOICE”
RROR ”is output to the data terminal 103 via the data terminal I / F unit 106.

On the other hand, the data terminal 103 operates according to a program stored in advance and executes the processing shown in FIG.

Hereinafter, the code sent to the data terminal 103 when an error is detected by the voice data error detection unit 801 is referred to as “VOICE ERROR”, and a mode switching request message is transmitted between the data terminals 103 performing communication. REQ MODE CHANGE ”and“ ACK MODEC ”as the mode switching confirmation message.
The operation of the data terminal 103 will be described assuming that “HANGE” is used. However, needless to say, these codes and messages are merely examples, and codes and messages having other values may be used.

Now, as shown in FIG.
03 indicates that the simultaneous transmission adapter 101
Check the data received from VOICE
If the character string “ERROR” is detected, the process 100
2, the communication mode switching request data "REQ
MODE CHANGE ”to the data terminal 10 of the communication partner.
3, the simultaneous transmission adapter 102 is transmitted via the PDC 102. Then, in process 1005, the data received from the simultaneous transmission adapter 101 is checked, and the communication mode switching confirmation message “A
The process of checking whether or not “CK MODECHANGE” has been received is repeated until it is determined that the “CK MODECHANGE” has been received.

On the other hand, in the process 1001, “VOIC
If the character string of “E ERROR” is not detected, the data received from the simultaneous transmission adapter 101 is further checked in processing 1003, and a communication mode switching request message “ACK MODE” from the communication partner side is checked.
Check whether "CHANGE" has been received. And
If it is determined in the process 1003 that the switching request message has not been received, the process ends.

On the other hand, in the process 1003, “REQ MODE”
If it is determined that “CHANGE” has been detected, the communication mode switching confirmation message “ACK MODE CH”
"ANGE" to the communication partner data terminal 103 via the PDC 102. Then, the process proceeds to processing 1006.

Processes 1006, 1007 and 1008 are processes for executing the communication mode switching sequence shown in FIG.
6, an escape command is output to the simultaneous transmission adapter 101.
01 waits until the escape command is detected by the communication mode determination unit 107 in 01 and the simultaneous transmission adapter 101 shifts to the online command mode, and when the online command mode is entered, a voice communication mode switching command is input in processing 1008.

As described above, the simultaneous transmission adapter 101 that has received the voice communication mode switching command
A non-telephone service request OFF is transmitted to C102,
Non-telephone service confirmation OFF upon response from base station
When the call is received, the mode transits to the voice communication mode, and a call in the voice communication mode is enabled.

The above description relates to the case where the sequence of switching the communication mode is controlled by the data terminal 103 with the error detection of the audio data shown in the second embodiment as a trigger. As shown, when the sequence of switching the communication mode is controlled by the data terminal 103 with the handover as a trigger, the following may be performed.

That is, the simultaneous transmission adapter 101 is provided with a detection unit for detecting the occurrence of a handover in the same manner as the wireless channel state detection unit 105 shown in the first embodiment. Is transmitted via the communication terminal interface processing unit 106.

Then, the processing 1 in FIG.
001, "VOIC" indicating non-permissible error picture detection
Instead of the character string "E ERROR", a code indicating the occurrence of handover is detected.

As described above, according to the third embodiment, the adapter 101 only needs to be provided with the wireless communication line detecting unit 112 or the voice data error detecting unit 801. Functions similar to those of the second embodiment can be realized.

The data terminal in each of the above embodiments may be a navigation device for navigating the driving of a car. In this case, the navigation device executes a program stored in the storage device provided, and calculates the current position of the moving object equipped with the navigation device based on the measured values of the various measurement devices and the provided road map data. Then, a process of displaying the road map around the calculated current position and the like is performed. In addition, it processes non-voice data input from the simultaneous transmission adapter 101. The content of the non-voice data processing differs depending on the type of the non-voice data. For example, when the non-voice data is notification information to the user,
Processing for displaying this may be considered. Further, the navigation device performs a process of outputting non-voice data to be transmitted via the communication line to the simultaneous transmission adapter 101.
As the non-voice data to be transmitted, data indicating the state of the navigation device, data input by the user, and the like can be considered.

As described above, according to the embodiment of the present invention, if a radio line condition deterioration or a sound quality deterioration due to handover occurs during a voice / data simultaneous communication in the non-voice data communication mode, the voice communication mode , The call with good voice quality can be resumed without causing discomfort to the caller. In addition, since request / confirmation data is transmitted and received between the two communication devices that are performing communication, the mode is automatically switched to the voice communication mode.
Switch between communication modes more smoothly and reliably

[0081]

As described above, according to the present invention, it is possible to reduce interruptions in sound during handover in simultaneous voice / non-voice data communication in the non-voice data communication mode.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a communication device according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram showing a procedure for switching to a conventional voice communication mode.

FIG. 3 is a sequence diagram showing a procedure for switching to a voice communication mode according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a format of a data packet according to the first embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a communication device according to a second embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a communication device according to a third embodiment of the present invention.

FIG. 7 is a flowchart showing a process performed by a data terminal in a third embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a conventional communication device.

FIG. 9 is a diagram showing the timing of data transmission and reception between a simultaneous transmission adapter and a PDC during simultaneous voice / non-voice communication.

FIG. 10 is a diagram showing a state of communication between two communication devices.

[Explanation of symbols]

 Reference Signs List 101 Simultaneous transmission adapter 102 PDC 103 Data terminal 104 Voice input / output unit 1041 Microphone 1042 Speaker 105 PDC I / F processing unit 1051 PDC control command processing unit 1052 TCH data transmission / reception unit 106 Data terminal I / F processing unit 107 Communication mode determination unit 108 AT command processing unit 109 Non-voice data processing unit 110 Voice data processing unit 111 Simultaneous voice / data communication processing unit 112 Wireless line state detection unit 113 Communication mode switching request / confirmation data transmission unit 114 Communication mode switching request / confirmation data detection unit 801 , 802 audio data error detector

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuaki Takahara 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Toru Nakamura 2-chome Hironodai, Zama-shi, Kanagawa 4991 Address Xanavi Informatics Co., Ltd. (72) Inventor Yukio Takeuchi 2-4999-1 Hironodai, Zama-shi, Kanagawa Prefecture Co., Ltd. Inside Xanavi Informatics Co., Ltd. Address Co., Ltd. in Xanavi Informatics

Claims (8)

[Claims] 1. A mobile communication network having a plurality of radio base stations is connected via a radio communication device for dynamically selecting and connecting one radio base station, and voice data is transmitted in a voice communication mode. A communication device for realizing voice communication and realizing simultaneous voice / data communication for simultaneously transmitting voice data and non-voice data in a non-voice data communication mode, wherein a handover in which a radio base station to which the radio communication device connects switches. A handover detecting means for detecting occurrence of the occurrence of a voice / voice in a non-voice data communication mode;
When performing data simultaneous communication, when a handover is detected, the communication with the communication device of the other party is changed from communication in the non-voice communication mode to communication in the voice communication mode in cooperation with the communication device of the other party. A communication device comprising: switching means for switching. 2. A mobile communication network having a plurality of radio base stations is connected via a radio communication device for dynamically selecting and connecting one radio base station, and voice data is transmitted in a voice communication mode. A communication device that realizes voice communication and realizes simultaneous voice / data communication for simultaneously transmitting voice data and non-voice data in a non-voice data communication mode. An error level determining means for detecting that the degree of error of the voice data received from the communication device exceeds a predetermined non-permissible level, a communication device of the other party, and voice / voice communication in the non-voice data communication mode.
When simultaneous data communication is performed, when it is detected that the level exceeds the non-permissible level, communication with the communication device of the other party is performed in the non-voice communication mode in cooperation with the communication device of the other party. Switching means for switching from a communication mode to a voice communication mode. 3. The communication device according to claim 1, wherein said switching means transmits a communication mode switching request to a communication device of the other party and receives a communication mode switching confirmation from the communication device of the other party. A request-side switching unit that switches the communication performed by the own communication device from the communication in the non-voice communication mode to the communication in the voice communication mode, and, when receiving a communication mode switching request from the communication device of the other party, communicates with the communication device of the other party. A communication device comprising: a confirmation-side switching unit that transmits a mode switching confirmation and switches communication performed by the own communication device from communication in a non-voice communication mode to communication in a voice communication mode. 4. A mobile communication network having a plurality of radio base stations is connected via a radio communication apparatus for dynamically selecting and connecting one radio base station, and voice data is transmitted in a voice communication mode. A communication device for realizing voice communication and realizing simultaneous voice / data communication for simultaneously transmitting voice data and non-voice data in a non-voice data communication mode, and controlling the communication device and transmitting non-voice data via the communication device; A data terminal for performing communication, wherein the communication device performs a voice / data simultaneous communication in at least a non-voice data communication mode, and generates a handover in which a wireless base station connected to the wireless communication device is switched. And a handover detecting means for detecting and notifying the data terminal, wherein the data terminal detects the handover detection, and A communication mode switching request is transmitted to the communication device, and when a communication mode switching confirmation is received from the communication device of the other party, the communication device is controlled to switch the communication from the communication in the non-voice communication mode to the communication in the voice communication mode. Switching means for transmitting a communication mode switching confirmation to the other communication device when receiving a communication mode switching request from the device, and controlling the communication device to switch the communication from the non-voice communication mode communication to the voice communication mode communication. A communication system comprising: 5. A mobile communication network having a plurality of radio base stations is connected via a radio communication device for dynamically selecting and connecting one radio base station, and voice data is transmitted in a voice communication mode. A communication device for realizing voice communication and realizing simultaneous voice / data communication for simultaneously transmitting voice data and non-voice data in a non-voice data communication mode, and controlling the communication device and transmitting non-voice data via the communication device; A data terminal for performing communication, wherein the communication device is a communication device of the other party in simultaneous voice / data communication in the non-voice data communication mode when performing simultaneous voice / data communication in the non-voice data communication mode. Error level determining means for detecting that the degree of error of the received voice data exceeds a predetermined non-permissible level, and notifying the data terminal of the error. The data terminal transmits a communication mode switching request to the communication device of the other party when it is notified that the non-permissible level has been exceeded, and When the communication mode switching confirmation is received from the communication device, the communication device is controlled to switch the communication from the communication in the non-voice communication mode to the communication in the voice communication mode, and when the communication mode switching request is received from the communication device of the other device, the communication device is controlled. A communication system comprising: a communication unit that transmits a communication mode switching confirmation to the communication device and controls the communication device to switch communication from non-voice communication mode communication to voice communication mode communication. 6. An in-vehicle system comprising the communication device according to claim 1, 2 or 4, wherein the wireless communication device is a mobile phone terminal, and the in-vehicle system performs navigation for driving a car. A navigation device, the navigation device outputs non-voice data to be transmitted to the communication device,
An in-vehicle system for receiving received non-voice data from the communication device. 7. The communication system according to claim 4, wherein the data terminal is a navigation device that performs navigation for driving a car. 8. A mobile communication network having a plurality of radio base stations is connected via a radio communication apparatus for dynamically selecting and connecting one radio base station, and voice data is transmitted in a voice communication mode. A communication mode switching method in a communication device for realizing voice communication and simultaneously transmitting voice data and non-voice data in a non-voice data communication mode, and for realizing simultaneous voice / data communication, comprising the steps of: Means for detecting the presence of communication in a state where voice data transmission cannot be performed normally or will not be performed normally; a communication device of the other party; and voice / voice communication in the non-voice data communication mode.
A state in which voice data cannot be normally transmitted between the communication apparatus of the other party when performing simultaneous data communication;
Alternatively, when it is detected that there is a communication state in a state where normal communication cannot be performed, communication with the other party communication device is performed in a non-voice communication mode communication in cooperation with the other party communication device. A communication mode switching method characterized by switching from a communication mode to a communication mode.