JP2001204065A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication unit accommodating plural wireless terminals and connected to a digital public communication channel that can surely reply to an incoming call when receiving the incoming call while using a wireless terminal. SOLUTION: The communication unit connected to the digital public communication channel is provided with a reception means that receives digital wireless data to be received from a wireless terminal and a means that controls the number of wireless slots in use depending on whether or not the digital wireless data to be received from the wireless terminal is to be sent to the digital public communication channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone network (ISDN) and a PIAFS (PH
S Internet Access Forum S
The present invention relates to a communication device having a digital wireless data communication processing function such as standard.

[0002]

2. Description of the Related Art In recent years, the development of digital wireless communication has progressed,
A facsimile apparatus having a built-in digital wireless communication function is known. In addition, a technique for performing Internet access and print output from a wirelessly connected PC (personal computer) using a facsimile apparatus has been proposed.

As a wireless data transmission system, attention has been paid to speeding up by transmitting using a plurality of wireless slots. For example, in PIAFS, by using two PHS radio slots, the ISDN 1
Wireless data communication equivalent to 64 kbps equal to the transmission speed of the channel (effective transmission speed is 58.4 kbps) is realized.

FIG. 4 is a diagram showing a digital wireless communication sequence when performing 64 kbps wireless transmission.

[0005] In other words, FIG. 4 shows a radio communication sequence when data is transmitted at 64 kbps using two PHS radio slots (see RCRSTD-28).

[0006] When a wireless terminal (slave) performing 64 kbps wireless data communication transmits a link channel establishment request to a master (facsimile machine) and receives a link channel assignment, the first TCH (Traffic Channel).
In 1), a first burst is transmitted by transmitting a synchronization burst. Next, a TCH addition request is transmitted to the master unit, and when a TCH addition assignment can be received, a synchronization burst is transmitted on the second TCH to establish a second radio link.

Next, a call setup message is transmitted on the first TCH. At this time, the information transfer rate in the transmission capability information element of the call setup message is set to “64 kbps” and transmitted.

When the destination number in the call setting message corresponds to the print processing, a response message is transmitted if the master unit is in a printable state. This allows 64k
bps wireless data transmission can be started,
The wireless terminal transmits print data to the master at a transmission rate of 64 kbps.

When the destination number in the call setting message corresponds to an outside line (digital public communication line) calling, the master unit performs a calling process to the ISDN and transmits the call setting message. When the master receives the response message from the ISDN, the master transmits a response message to the wireless terminal. This makes it possible to start 64 kbps wireless data transmission, and the wireless terminal can transmit 64 kbps via the master unit.
Data transmission / reception using a digital public communication line can be performed at a transmission speed of bps.

[0010]

However, in the above conventional example, when the wireless terminal starts wireless data transmission at a transmission rate of 64 kbps (a transmission rate using two wireless slots of 32 kbps), the available wireless slots are increased. Since it is lost, other wireless terminals cannot perform wireless communication.

That is, when a wireless terminal that uses two 32 kbps wireless slots and performs wireless data transmission at 64 kbps is accessing the Internet using the first channel of the ISDN, a vacant wireless terminal is used. Since there is no slot, other wireless terminals cannot communicate wirelessly. However, even if the wireless terminal cannot be used, IS
The second channel of the DN is vacant, and by using the second channel, the facsimile apparatus, which is the parent machine, can perform telephone and facsimile communication.

On the other hand, when the wireless terminal is transmitting print data to the master at a transmission rate of 64 kbps,
When telephone or facsimile communication is performed using the first channel of the ISDN, there is no communicable terminal even though the second channel of the ISDN has a vacancy (a state where there is no vacancy in the communication resources). ). That is, when there is an incoming call using the second channel of the ISDN in the above state, the wireless device has no free space, so that the child device cannot be used and cannot be called. Further, since the telephone of the base unit is also used, the base unit cannot be called.

[0013] A method of reducing the data transmission speed of the wireless terminal to 32 kbps when there is an incoming call using the second channel of the ISDN is considered. However, since it takes time to establish a wireless link between the master unit and the slave unit, it is not possible to respond quickly to an incoming call.

Although the above problem can be solved by increasing the number of usable wireless slots, another problem that leads to an increase in the cost of a high-frequency circuit or the like occurs.

As described above, when data communication is performed between the slave unit and the master unit using all the wireless slots, the ISDN
There is a problem that it may not be possible to respond to an incoming call from the Internet.

According to the present invention, in a communication apparatus which accommodates a plurality of wireless terminals and is connected to a digital public communication line, if an incoming call is received while using the wireless terminal, the incoming call is reliably answered. It is an object of the present invention to provide a communication device capable of performing such operations.

[0017]

SUMMARY OF THE INVENTION According to the present invention, there is provided a communication apparatus connected to a digital public communication line, a receiving means for receiving digital wireless data to be received from a wireless terminal, and a receiving means for receiving digital wireless data from the wireless terminal. A communication apparatus having means for controlling the number of wireless slots to be used depending on whether the digital wireless data is transmitted to the digital public communication line.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows a facsimile apparatus 1 according to a first embodiment of the present invention.
FIG. 1 is a diagram showing a system configuration of No. 01.

The facsimile apparatus 101 is wirelessly connected to a first digital cordless telephone 102 and a second digital cordless telephone 103. The second digital cordless telephone 103 is a wireless data communication adapter (P
It is connected to a PC (personal computer) 105 via an IAFS card 104. Further, the facsimile apparatus 101 is connected to a first partner terminal 107 and a second partner terminal 108 via the ISDN 106. In addition,
The first partner terminal 107 is an Internet service
Provider (Internet Service Pr)
provider (ISP: ISP).

FIG. 2 is a block diagram showing the configuration of the facsimile apparatus 101.

In the facsimile apparatus 101, the CPU
Reference numeral 201 denotes a circuit that controls connection of a communication path and the like.
The CPU 205 is a facsimile engine control unit, that is, a circuit that performs an image data processing operation of the facsimile apparatus 101.

The ROM 207 stores the facsimile machine 101
The RAM 208 is a memory for storing image data of the facsimile apparatus 101.

The shared register 209 is a register for exchanging data between the first data bus 202 and the second data bus 206.

The operation panel 210 includes a dial key, a facsimile transmission key, an answering mode setting key, a liquid crystal display panel, and the like, and is used by the user of the facsimile apparatus 101 to input a destination telephone number and the like. is there.

The color scanner 211 reads an image transmitted by the facsimile apparatus 101, the color printer 212 prints an image received by the facsimile apparatus 101, and the image processing unit 213 outputs the read image. This performs compression and decompression processing between the image data and the image to be printed, and exchanges data with the RAM 208.

The fax modem 214 has an image processing unit 213
Modulates the image compressed by the analog signal to convert the image into an analog signal, and demodulates the received analog signal and modulates the analog signal.
Circuit.

The voice compression / expansion unit 215 is used when recording and playing back a response message or a message of the other party in the answering machine function. The data is compressed into digital data of about 4 Kbps and stored in the RAM 208. The compressed data stored in the RAM 208 is decompressed by the audio compression / decompression unit 215, and the handset 2
16 and the speaker 217.

The cross point switch 218 is a switch for switching connection of various analog signals.

The ISDN I / F (ISDN interface unit) 221 controls the layers 1 to 3 of the ISDN and has a data input / output function of the ISDN B channel. Further, the ISDN I / F 221 receives the ISDN (point U) 219 via the DSU 220 which converts data exchanged with the central office into a TTL level signal.
To the HDLC 22 via a signal line 235.
2 and to the path changeover switches 232 and 233 via signal lines 236 and 237.

HDLC (High Level Dat)
a Link Control 222 is a circuit that performs processing for assembling / disassembling data in HDLC format with respect to ISDN.

A wireless data communication protocol processing unit (PIA)
The FS processing unit 223 is a circuit that performs a frame assembling / disassembling process in a wireless data communication protocol format.

The PHS processing section 224 is a circuit for performing PHS wireless communication protocol processing, PCM coding conversion processing, and the like, and the high frequency section 225 is a circuit for transmitting and receiving radio waves.

The PCM codecs 226 and 227 are circuits for performing a conversion process between an analog signal and PCM encoded data, and the PCM / ADPCM conversion units 228 and 229
This is a circuit that converts ADPCM encoded data transmitted through a PHS wireless line into PCM encoded data.

The data multiplexing / decomposing section 230 is a point of this embodiment, and is a PHS radio line (the facsimile apparatus 1).
This is a circuit that multiplexes and decomposes data transmitted and received using two wireless slots of a wireless line between the digital cordless telephones 01 and the digital cordless telephones 102 and 103).

That is, using two wireless slots, 64
When performing data transmission (transmission of Internet file data from a PC or print data from a PC) at a communication speed of kbps, two 32 kbps data output from the PHS processing unit 224 are multiplexed to 64 kbps.
The corresponding wireless data is output to the PIAFS processing unit 223. When performing data transmission at a communication speed of 32 kbps using one wireless slot, the PHS processing unit 224
Of the two 32 kbps data output from
The data specified by the PU 201 (such as data of an Internet file from a PC and print data from a PC) is output to the PIAFS processing unit 223.

On the other hand, the 64 k
When bps data is output, the data is decomposed into two 32 kbps data and output to the PHS processing unit 234. When data of 32 kbps is output from the PIAFS processing unit 223, the data is
Output to the HS processing unit 224.

The clock generator 231 is provided with the PHS processor 2
3 synchronized with the digital wireless communication line output from 24
By dividing the frequency of the 84 kHz clock, 32 kHz
Hz or 64 kHz. One of the generated clocks is selected according to the wireless data transmission rate and output to the PIAFS processing unit 223.

The path changeover switches 232 and 233 are connected to the IS
This switch switches between selecting an analog signal such as facsimile data as data to be transmitted by the DN, or selecting an audio signal transmitted from the digital cordless telephones 102 and 103 and output from the PHS processing unit 224. Note that this switching is performed under the control of the CPU 201.

Next, the main signal lines will be described.

The signal line 234 is connected to the CPU 201 and the CPU 2
This is a serial communication signal line for exchanging control signals with the control signal line 05.

The signal lines 235 to 237 are ISDN
A serial signal line for inputting and outputting data between the interface unit 221 and the HDLC 222 or the path changeover switches 232 and 233.
1 selects two of them and connects the selected two to the ISDN B1 and B2 channels, respectively.

The signal lines 238 and 239 are connected to the FAX modem 2
14, handset 216 and PCM CODEC 22
6 and 227 are signal lines for exchanging analog signals.

Signal lines 240 and 241 are signal lines for exchanging ADPCM-encoded audio data between digital cordless telephones 102 and 103 and PCM / ADPCM converters 228 and 229.

The signal line 242 is a signal line for transmitting 32 kbps data transmitted and received in the first wireless slot, and the signal line 243 is a signal line for transmitting 32 kbps data transmitted and received in the second wireless slot. . Also,
The signal line 244 is a 64k multiplexed with the data from the signal lines 242 and 243 according to the use status of the radio slot.
This is a signal line for transmitting data of bps or transmitting data of 32 kbps in which the multiplexing is not performed.

The signal line 245 is a signal line for transmitting the 384 kHz clock output from the PHS processing unit 224 to the clock generation unit 231 in synchronization with the digital wireless communication line. The signal line 246 transmits the 32 kHz or 64 kHz clock generated by the clock processing unit 231 to the PIA.
This is a signal line to be transmitted to the FS223.

FIG. 3 is a data format diagram for multiplexing radio slots.

FIG. 5 shows a wireless data transmission protocol (PI
FIG. 3 is a diagram showing a frame format used in AFS).

FIG. 5A shows a negotiation frame transmitted and received to select a protocol and establish frame synchronization. FIG. 5B shows a synchronization frame transmitted and received to resynchronize a frame during communication. Indicates the frame,
FIG. 5C shows a control frame for transmitting and receiving control information, and FIG. 5D shows a data frame for transmitting and receiving user data.

When performing data communication by PIAFS,
First, in-band negotiation, frame synchronization establishment, response delay time measurement, and the like are performed by using a negotiation frame. Next, communication parameters are set by a control frame, and data communication is started by a data frame.

Next, the operation of the facsimile machine 101 will be described.

FIGS. 6 to 8 are flowcharts showing the operation of the facsimile apparatus 101.

First, when the PC 105 accesses the Internet using the wireless data communication function of 64 kbps, an operation when an incoming call is received from the ISDN will be described with reference to FIG.

The PC 105 starts application software for Internet access, and stores data (for example,
The operation of transmitting (e-mail data) is started. PC1
05 notifies the PIAFS card 104 of a transmission request, and receives the PIAFS card 10
4 makes a call request to the PHS telephone 103. The call request includes telephone number information “03-1234-5678” specified by the application software.

The PHS telephone 103 transmits a link channel establishment request to the facsimile apparatus 101, and thereafter, the facsimile apparatus 101 follows the sequence shown in FIG.
A 64 kbps wireless channel is established with the PHS telephone 103. That is, the PHS telephone 103 and the facsimile apparatus 101 transmit a synchronization burst on the first TCH to establish a first wireless link. Next, PHS
The telephone 103 sends a TCH addition request to the facsimile
1 and receive additional TCH allocation,
A second burst is transmitted on the second TCH to establish a second radio link.

Next, the PHS telephone 103 sets the first TCH
To send a call setup message. At this time, the information transfer rate in the transmission capability information element of the call setup message is set to “64 kbps” and transmitted. Also, the telephone number information “03-12” previously received from the PIAFS card 104 and included in the outgoing call request is included in the called number information element.
34-5678 ".

The CP provided in the facsimile apparatus 101
When U201 receives the call setup message (S60)
1) The called number information element in the message is read, and it is determined whether this is a normal telephone number or a specific number indicating print data (S602).

Since the telephone number information "03-1234-5678" contained in the called number information element in the call setting message is a normal telephone number, the mode shifts to the Internet access mode.

Next, the ISDN interface unit 221 transmits a call setup message to the ISDN 219 (S603). When receiving the response message from the ISDN (S604), the PHS processing unit 224 causes the PHS telephone 1
A response message is transmitted to the server 03 (S605).
At this stage, transmission and reception of data using the B1 channel between the PC 105 and the server terminal 107 connected via the ISDN become possible.

Next, the data output from the two wireless slots is multiplexed by the data multiplexing / decomposing section 230 into 64 kbps data. Also, the clock generation units 231 to 6
A 4 kHz clock is output (S606).

Thereafter, the PIAFS card 104 transmits and receives the PIAFS wireless transmission frame shown in FIG. 5 at a transmission rate of 64 kbps according to the wireless data communication protocol, and establishes a wireless data communication link. Specifically,
A negotiation frame is transmitted to establish synchronization with the PIAFS controller 223, and then, settings such as presence / absence of compression are exchanged by a communication parameter setting request frame, which is a type of control frame.

During this time, the facsimile apparatus 101
When data is received from the S telephone 103, the data received from the PHS processing unit 224 in the two wireless slots is multiplexed into 64 kbps data by the data multiplexing unit 230 and output to the PIAFS processing unit 223. continue,
The PIAFS frame is decomposed in synchronization with the 64 kHz clock input to the PIAFS processing unit 223, and a reception process for establishing a wireless data transmission link is performed (S607).

When the wireless data transmission link is established, the PC
105 starts transmission of data to be transmitted to the server terminal 107. Data output from the PC 105 is input to the facsimile apparatus 101 in a PIAFS data frame format. The facsimile apparatus 101 that has received the data performs frame disassembly processing for deleting the frame identification header, the ARQ control unit, the FCS unit, and the like of the received data frame,
The data is stored in the memory 204 via the data bus 202 (S608). Next, the data stored in the memory 204 is transferred to the HDLC 220, converted into 64 kbps synchronous data, and transmitted to the ISDN via the ISDN interface unit 221 (S610) (PIAFS-PPP).
Conversion process).

Next, as described above, when a call setup message is received from the ISDN during Internet access while performing 64 kbps wireless data communication (S611), the CPU 201 transmits the call message to the ISDN.
While transmitting to the DN, the path switch 232 is switched to connect the ISDN interface unit 221 to the PCM codec 226.

The ringing tone sent from the ISDN B2 channel is converted into an analog signal by the PCM codec 226 and output to the speaker 217 via the cross point switch 218 (S612).

Subsequently, when the user goes off-hook on the handset 216 (S613), the CPU 201 sets the ISDN
Is transmitted (S614), and thereafter, the B2 channel path with the other party is connected and the call is started. In this state, facsimile communication can be performed instead of the telephone call (S615).

The above Internet access operation is continued until the PC 105 issues a data transmission end notification. Then, when the PIAFS card 104 receives the data transmission end notification from the PC 105 (S61).
6), the PIAFS card 104 performs wireless data communication end processing (S617), and the PHS telephone 103 performs wireless line disconnection processing.

Subsequently, upon receiving an end notification from the PHS telephone 103 (S618), the facsimile machine 101
Performs a disconnection process between the PHS telephone 103 and the ISDN 219 (S619), and the Internet access operation ends.

With the above operation, the PC 105 becomes 64k
If there is an incoming call from the ISDN while performing Internet access using the ISDN B1 channel while performing bps wireless data communication, telephone and facsimile communication can be performed using the ISDN B2 channel.

Next, when data for printing is transmitted wirelessly, an operation when an incoming call is received from the ISDN will be described with reference to FIGS. 7 and 8. FIG.

The PC 105 starts up the application software for printing and starts the operation of transmitting the print data.
The driver software in PC 105 is PIAFS card 10
The PIAFS card 104 sends a call request notification to the PHS telephone 103. This transmission request includes printing number information “00-0000-0000” specified by the application software.

The PHS telephone 103 transmits a link channel establishment request to the facsimile apparatus 101, and thereafter, the facsimile apparatus 101 sets the P channel according to the sequence shown in FIG.
A 64 kbps wireless channel is established with the HS telephone 103. That is, a synchronization burst is transmitted on the first TCH to establish a first radio link. Next, a TCH addition request is transmitted to the master unit, and when a TCH addition assignment can be received, a synchronization burst is transmitted on the second TCH to establish a second radio link.

Next, the PHS telephone 103 sets the first TCH
To send a call setup message. At this time, the information transfer rate in the transmission capability information element of the call setup message is set to “64 kbps” and transmitted. The called number information element includes the telephone number information “00-00” included in the outgoing call request previously received from the PIAFS card 104.
00-0000 ”.

The CPU 201 provided in the facsimile apparatus 101 having received the call setting message (S601)
The called number information element in the message is read, and it is determined whether this is a normal telephone number or a specific number indicating print data (S602).

If the telephone number information “00-0000-0000” included in the called number information element in the call setting message is a specific number indicating print data, the mode shifts to the print mode. In the print mode, the call setting acceptance message, the call message, and the response message are immediately returned to the PHS telephone 103 without performing the calling process to the ISDN (S620). At this stage, PC 105 and PIAF
Data transmission / reception is possible with the S controller 221 at a transmission speed of 64 kbps.

Next, the data multiplexing / decomposing section 230 multiplexes the data output from the two radio slots into 64 kbps data. Also, the clock generation units 231 to 6
A 4 kHz clock is output (S621).

Thereafter, the PIAFS card 104 transmits and receives the PIAFS wireless transmission frame shown in FIG. 5 at a transmission rate of 64 kbps according to the wireless data communication protocol, and establishes a wireless data communication link. Specifically,
A negotiation frame is transmitted to establish synchronization with the PIAFS controller 223, and then, settings such as presence / absence of compression are exchanged by a communication parameter setting request frame, which is a type of control frame.

During this time, the facsimile machine 101
When data is received from the S telephone 103, the data received from the PHS processing unit 224 in the two wireless slots is multiplexed into 64 kbps data by the data multiplexing unit 230 and output to the PIAFS processing unit 223. PIAFS
The PIAFS frame is decomposed in synchronization with the 64 kHz clock input to the processing unit 223, and reception processing for establishing a wireless data transmission link is performed (S622).

When the wireless data transmission link is established, the PC
105 starts the transmission of the print data. Data output from the PC 105 is input to the facsimile apparatus 101 in a PIAFS data frame format. The facsimile apparatus 101 that has received the data performs frame disassembly processing for deleting the frame identification header, the ARQ control unit, the FCS unit, and the like of the received data frame, and stores the data in the memory 204 via the data bus 202 (S623). .

The CPU 201 notifies the CPU 205 of the start of the printing operation (S624). Upon receiving the notification, the CPU 205 activates the color printer 212 (S6).
25) When the activation is completed, the fact is notified to the CPU 201 (S626).

The CPU 201, which has been notified that the activation of the printer has been completed, reads the print data stored in the memory 204 and writes it in the shared register 209 (S
627). The CPU 205 reads the data written in the shared register 209 (S628), converts the format into printable data, and inputs the data to the color printer 210, and the color printer starts printing (S629).
This printing operation is continued in parallel with the data transmission of 64 kbps until all the data to be printed are transmitted by the PC 105 (S630).

Next, an operation when an incoming call is received from the ISDN while the PC 105 is transmitting print data to the facsimile apparatus 101 will be described.

When a call setup message is received from ISDN (S631), CPU 201 transmits a call message to ISDN.
While transmitting to the DN, the path switch 232 is switched to connect the ISDN interface unit 221 to the PCM codec 226.

The ringing tone sent from the ISDN B1 channel is converted into an analog signal by the PCM codec 226 and output to the speaker 217 via the cross point switch 218 (S632).

When the user goes off-hook on the handset 216 (S633), the CPU 201 transmits a response message to the ISDN (S634), and thereafter, the B1 channel path is connected to the other party to start a call (S635). ). In this state, facsimile communication can be performed instead of the telephone call.

At this stage, there is no communicable resource even though the ISDN B2 channel can be used. That is, the handset of the master unit is used, the wireless line with the wireless terminal is occupied by the transmission of print data, and the PHS telephone 102 cannot be used.

Then, next, the PHS processing unit 224 controls the PHS processing unit 224 to change the wireless transmission speed of the print data to 32 kbps so that the PHS telephone unit 102 can communicate in response to the incoming call from the ISDN B2 channel. Is issued (S636). Then PHS
The processing unit 224 uses the SACCH to send the PHS telephone 1
Then, a second TCH disconnection message is transmitted to the mobile station 03 (S637). Next, upon receiving a release message from the PHS telephone 103 (S638), the PHS processing unit 224
Transmits a radio channel disconnection command on the FACCH, and the second TCH becomes idle (S639).

Next, the PHS processing section 224 sends the second TC
The CPU 201, which has been notified that the disconnection of H has been completed,
The data multiplexing / decomposing unit 230 and the clock generating unit 231 are controlled to switch to the 32 kbps transmission mode (S64
0). Subsequently, the PHS telephone 103 notifies the PIAFS card 104 that the transmission has been switched to 32 kbps transmission, and the PIAFS card 104 transmits the 32 kbps PI.
The transmission of the AFS data is started.

Thereafter, the data transmitted from the PC 105 is transmitted as wireless data at 32 kbps using the first TCH, and printing is continued (S64).
1).

Since the second TCH can be made empty in this way, if there is a new incoming call from the ISDN B2 channel (S642), the PHS telephone 1
02 is transmitted to S02 (S643),
When there is a response from the PHS telephone 102 (S644), a call can be started (S645).

Next, if the communication using two ISDN channels is completed while the print data is being wirelessly transmitted at 32 kbps (S646), the wireless data transmission speed of the print data is again reduced to 64 kbps. It is possible to switch to

In this case, the CPU 201
24 is notified that the transmission is changed to 64 kbps transmission (S647), and the PHS processing unit 224 sends the PHS telephone 10
3 is transmitted to the TCH addition allocation message (S
648). PHS receiving TCH additional allocation message
Telephone 103 is 64k for PIAFS card 104
An instruction is given to switch to bps transmission.

Next, the CPU 20 notified from the PHS processing unit 224 that the TCH additional allocation message has been transmitted.
1 is a data multiplexing / decomposing unit 230 and a clock generating unit 23
1 is controlled so as to be able to transmit 64 kbps (S649).

Subsequently, when the re-synchronization of the PIAFS frame is established (S650), the print data transmitted from the PC 105 can be wirelessly transmitted at 64 kbps thereafter.

By the above operation, when there is a free space in the communication resources of the master unit, the wireless data communication is performed at the maximum speed, and when the communication resources of the master unit are exhausted, the wireless data communication with the reduced speed is performed. By doing so, communication resources equivalent to the number of channels of the public communication line can always be prepared.

As a result, transmission of print data from the child device to the parent device, communication on the ISDN B1 channel,
And communication on the B2 channel can be performed simultaneously.

When all the communication using the digital public communication line is completed while the communication is being performed while reducing the number of wireless slots, a notification to increase the number of wireless slots to be used is sent to the wireless terminal. By transmitting, wireless data transmission can be performed again at the maximum transmission speed when communication resources allow.

In the above embodiment, when wireless data transmission is performed using a plurality of wireless slots, the clock of 64 kHz generated by the clock generator 231 is selected, and the wireless communication is performed using a single wireless slot. When performing data transmission, 32 kHz generated by the clock generation unit 231
, And operates in synchronization with the selected clock, the wireless data communication frame assembling / disassembling unit 223 can be common regardless of the wireless data transmission speed.

When data transmission is performed using a plurality of radio slots, data conversion is performed by data multiplexing / decomposing section 230. When data transmission is performed using a single radio slot, data multiplexing / decomposition is performed. If the data conversion is not performed by the unit 230, the data multiplexing / decomposing unit 230 can be common regardless of the transmission speed of the wireless data.

When a notification to reduce the number of wireless slots is transmitted to the wireless terminal, the clock used for assembling / disassembling the wireless data communication frame is switched, and the data multiplexing / decomposing section 230 performs data conversion processing. Because of the absence, the resynchronization of the wireless data transmission with the wireless terminal due to the change of the transmission speed can be speeded up.

When a notification to increase the number of radio slots is transmitted to the radio terminal, the clock used for assembling / decomposition of the radio data communication frame is switched, and the data multiplexing / decomposition unit 230 performs data conversion processing. By
The resynchronization of the wireless data transmission with the wireless terminal due to the change of the transmission speed can be speeded up.

[Second Embodiment] In the first embodiment, when print data is transmitted at 64 kbps,
When the communication using the SDN B1 channel starts, the transmission speed of the print data is changed to 32 kbps.

In the second embodiment, data transmitted wirelessly is
When it is determined that the print data is not transmitted to the SDN, the transmission speed of the print data is changed to 32 kbps.

In this case, the print data is always 32 kbps.
However, when printing print data, communication resources corresponding to the number of channels of the public communication line can always be prepared, and switching of data transmission speed during communication is required. There is an advantage that complicated processing is unnecessary.

[Third Embodiment] The above embodiment assumes a system in which the number of usable radio slots is two, and switches between using two slots or using only one slot. is there.

The third embodiment is a system that can use more radio slots, and can obtain the same effects as described above.

For example, up to 128k using 4 slots
In a system capable of wireless transmission of bps, transmission of print data is performed at 128 kbps, but when communication is started on one ISDN line using the master unit, a 96 kbps wireless transmission using three slots is performed. The third embodiment employs a configuration in which switching is performed.

According to the third embodiment, in a system having a large number of wireless slots, data transmission using the maximum number of wireless slots is performed, and communication resources corresponding to the number of channels of a public communication line are always used. Can be prepared. Then, when there is an incoming call from the public communication line, it is possible to reliably respond to the incoming call, and the public communication line can be utilized to the maximum.

In each of the above embodiments, the B1 channel and the B
Although an ISDN having two channels is described as an example, the above embodiment can be applied to a next-generation digital public communication line such as a broadband ISDN.

Further, in each of the embodiments described above, the facsimile apparatus has been described as an example. However, the above embodiments can be applied to an image communication apparatus other than the facsimile apparatus (for example, a personal computer or a videophone equipped with recording means). Can be.

The facsimile apparatus 101 in the above embodiment is a communication apparatus connected to a digital public communication line, which receives digital radio data to be received from a radio terminal, and receives from the radio terminal. When transmitting the digital wireless data to the digital public communication line, the digital wireless data is received using a plurality of wireless slots, while the digital wireless data to be received from the wireless terminal is transmitted to the digital public communication line. This is an example of a communication device having reception control means for receiving the digital wireless data using a single wireless slot when not transmitting to a communication line.

Further, the facsimile apparatus 101 is a communication apparatus connected to a digital public communication line. The facsimile apparatus 101 includes a receiving means for receiving digital radio data to be received from a radio terminal, and a digital radio data to be received from the radio terminal. Data is received using a plurality of wireless slots, the digital wireless data to be received from the wireless terminal is not transmitted to the digital public communication line, and the first channel of the digital public communication line is used. This is an example of a communication device including a reception control unit that reduces the number of the plurality of wireless slots used for reception from the wireless terminal when the communication starts.

Further, when the facsimile apparatus 101 is performing reception while reducing the number of the plurality of radio slots,
When the communication using the first channel of the digital public communication line is completed, an example of a communication device that transmits a notification of increasing the number of the reduced wireless slots to a wireless terminal using the wireless slot is provided. is there.

Further, the facsimile apparatus 101 is a communication apparatus connected to a digital public line. The facsimile apparatus 101 includes a transmitting / receiving means for transmitting / receiving digital wireless data to / from a wireless terminal, and a number of wireless slots used for transmitting / receiving. Control means for controlling the number of radio slots, first clock generation means for generating a first clock synchronized with the digital radio communication between the radio terminal, and the digital radio between the radio terminal When transmitting and receiving the digital wireless data using a second clock generating means for generating a second clock synchronized with communication and a plurality of wireless slots controlled by the wireless slot number controlling means, Using the clock generated by the clock generation means of When transmitting and receiving the digital wireless data using a slot, a clock selecting means using a clock generated by the second clock generating means, and a communication frame for assembling or disassembling a communication frame of the digital wireless data This is an example of a communication device having an assembling / disassembling means, and operating the communication frame assembling / disassembling means in synchronization with a clock generated by the selected clock generating means.

Further, the facsimile apparatus 101 includes a data multiplexing unit that multiplexes digital radio data received using the plurality of radio slots and outputs the multiplexed digital radio data to the communication frame assembling / disassembling unit. A data decomposing means for decomposing the output data into data for transmission to the wireless terminal using a plurality of slots; and a data multiplexing means for performing data transmission using the plurality of radio slots. And performing data conversion by the data decomposing means, and performing data transmission using the single wireless slot, a data conversion control means that does not perform data conversion by the data multiplexing means or the data decomposing means, 1 is an example of a communication device having

Further, the facsimile apparatus 101 switches the clock used for assembling and disassembling the communication frame when transmitting a notification for reducing the number of the plurality of wireless slots to the wireless terminal. This is an example of a communication device in which the data conversion is not performed by the data multiplexing unit or the data decomposing unit.

Further, when the facsimile apparatus 101 is performing communication while reducing the number of the plurality of wireless slots and ending the communication using the digital public communication line, the number of the reduced wireless slots is reduced. Transmitting means for transmitting a notification to increase the number of wireless slots, and switching the clock used for assembling and disassembling the communication frame when transmitting the notification for increasing the number of wireless slots. In addition, this is an example of a communication device that performs data conversion by the data multiplexing unit and the data decomposing unit.

Further, the facsimile apparatus 101 comprises a recording means for recording the digital radio data to be received from the radio terminal, and a facsimile apparatus 101 for recording the digital radio data to be received from the radio terminal. This is an example of a communication device having reception control means for receiving the digital wireless data using a wireless slot.

Further, the facsimile apparatus 101 includes a recording means for recording the digital radio data to be received from the radio terminal, a communication means for making a telephone call or facsimile communication via a digital public communication line, and a recording means for recording on the recording means. When calling or facsimile communication is started via the digital public communication line while receiving the digital wireless data to be transmitted from the wireless terminal, And a reception control unit that reduces the number of wireless slots.

Further, the facsimile apparatus 101 is a communication apparatus connected to a digital public communication line, which includes a receiving means for receiving digital wireless data to be received from a wireless terminal, and a digital wireless data to be received from the wireless terminal. When transmitting data to the digital public communication line,
If the digital wireless data is received using a first number of wireless slots, and the digital wireless data to be received from the wireless terminal is not transmitted to the digital public communication line, the first number may be greater than the first number. 2 is a diagram illustrating an example of a communication device having reception control means for receiving the digital wireless data using a small second number of wireless slots.

[0120]

According to the present invention, in a communication device that accommodates a plurality of wireless terminals and is connected to a digital public communication line, if a call is received while using the wireless terminal, the incoming call is received. This has the effect of being able to respond reliably to

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration of a facsimile apparatus 101.

FIG. 2 is a block diagram illustrating a configuration of the facsimile apparatus 101.

FIG. 3 is a data format diagram for multiplexing wireless slots.

FIG. 4 is a diagram showing a digital wireless communication sequence when performing 64 kbps wireless transmission.

FIG. 5 is a diagram showing a frame format used in a wireless data transmission protocol (PIAFS).

FIG. 6 is a flowchart illustrating an operation of the facsimile apparatus 101.

FIG. 7 is a flowchart showing an operation of the facsimile apparatus 101.

FIG. 8 is a flowchart showing an operation of the facsimile apparatus 101.

[Explanation of symbols]

 101: facsimile machine, 102, 103: digital cordless telephone, 104: PIAFS adapter, 105: PC (personal computer), 106: ISDN, 107, 108: partner terminal, 201, 205: CPU, 212: color printer, 213 ... Image processing unit 214 FAX modem 215 Audio compression / expansion unit 216 Handset 217 Speaker 218 Crosspoint switch 221 ISDN interface 222 HDLC 223 PIAFS 224 PHS processing unit 225: High-periphery part, 226, 227: PCM CODEC, 228, 229: PCM / ADPCM conversion part, 230: Data multiplexing / decomposition part, 231: Clock generation part, 232, 233: Path switch.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 11/00 303 H04L 11/00 310C 5K067 H04N 1/00 107 11/02 Z 5K101 1/32 13/00 307A 9A001 // H04L 29/08 F-term (reference) 5C062 AA02 AA14 AA34 AA37 AB38 AC39 AE02 AE14 BA02 5C075 AB03 AB06 CC11 CD23 FF09 5K030 GA11 HA01 HB04 HC01 JA01 JL01 JT05 JT09 KA21 LA09 LE03 DD03 DA03 A03 5 EE13 KK21 5K067 AA21 BB08 CC05 DD13 DD25 DD52 EE02 EE10 EE71 FF02 GG01 GG11 HH01 HH23 KK15 5K101 KK01 LL03 LL11 LL14 9A001 CC05 JJ12 KK56

Claims (11)

[Claims] 1. A communication device connected to a digital public communication line, comprising: receiving means for receiving digital wireless data to be received from a wireless terminal; and transmitting the digital wireless data to be received from the wireless terminal to the digital public. When transmitting to a communication line, the digital wireless data is received using a plurality of wireless slots, while when not transmitting the digital wireless data to be received from the wireless terminal to the digital public communication line, a single And a reception control means for receiving the digital wireless data using the wireless slot of (1). 2. A communication device connected to a digital public communication line, comprising: receiving means for receiving digital wireless data to be received from a wireless terminal; and transmitting the digital wireless data to be received from the wireless terminal to a plurality of wireless devices. Receiving using a slot, not transmitting the digital wireless data to be received from the wireless terminal to the digital public communication line, and
Receiving control means for reducing the number of the plurality of wireless slots used for reception from the wireless terminal when communication using the first channel of the digital public communication line is started. Characteristic communication device. 3. The wireless communication system according to claim 2, wherein the communication using the first channel of the digital public communication line ends when the reception is performed with the number of the plurality of wireless slots reduced. A communication device for transmitting a notification for increasing the number of slots to a wireless terminal using the wireless slot. 4. A communication device connected to a digital public line, a transmission / reception means for transmitting / receiving digital radio data to / from a radio terminal; a radio slot number for controlling the number of radio slots used for the transmission / reception. Control means; first clock generating means for generating a first clock synchronized with the digital wireless communication with the wireless terminal; and first clock generating means synchronized with the digital wireless communication with the wireless terminal. Second clock generating means for generating two clocks; and when transmitting and receiving the digital wireless data using a plurality of wireless slots controlled by the wireless slot number controlling means, the first clock generating means Using the generated clock, while using a single radio slot controlled by the radio slot number control means. When transmitting and receiving wireless data, there are clock selecting means using a clock generated by the second clock generating means; and communication frame assembling / disassembling means for assembling or disassembling a communication frame of the digital wireless data. A communication apparatus wherein the communication frame assembling / disassembling means operates in synchronization with a clock generated by the selected clock generating means. 5. The communication frame assembling / disassembling unit according to claim 4, wherein the digital wireless data received using the plurality of wireless slots is multiplexed and output to the communication frame assembling / disassembling unit. Data decomposing means for decomposing the output data into data to be transmitted to the wireless terminal using a plurality of slots; and when performing data transmission using the plurality of radio slots, the data multiplexing means And performing data conversion by the data decomposing means, and performing data transmission using the single wireless slot, a data conversion control means that does not perform data conversion by the data multiplexing means or the data decomposing means, A communication device comprising: 6. The clock according to claim 4, wherein the clock used for assembling or disassembling the communication frame is switched when a notification for reducing the number of the plurality of wireless slots is transmitted to the wireless terminal. In addition, the communication apparatus is characterized in that the data conversion is not performed by the data multiplexing means or the data decomposing means. 7. The communication system according to claim 4, wherein the communication using the digital public communication line is terminated when the communication is performed while reducing the number of the plurality of wireless slots. Transmitting means for transmitting a notification for increasing the number of wireless slots to the wireless terminal;
When a notification to increase the number of radio slots is transmitted, the clock used for assembling and disassembling the communication frame is switched, and data conversion is performed by the data multiplexing means and the data decomposing means. A communication device characterized in that the communication is performed. 8. The recording device according to claim 1, wherein the digital wireless data to be received from the wireless terminal is recorded; and the digital wireless data to be received from the wireless terminal is recorded by the single unit. And a reception control means for receiving the digital wireless data by using a wireless slot. 9. The recording device according to claim 2, wherein the recording device records the digital wireless data to be received from the wireless terminal; a communication device that performs a telephone call or a facsimile communication via a digital public communication line; When receiving digital wireless data from the wireless terminal, when a call or facsimile communication is started via the digital public communication line,
A reception control unit for reducing the number of the plurality of radio slots used for reception from the radio terminal. 10. A communication device connected to a digital public communication line, comprising: receiving means for receiving digital wireless data to be received from a wireless terminal; and transmitting the digital wireless data to be received from the wireless terminal to the digital public. When transmitting to the communication line, receiving the digital wireless data using the first number of wireless slots, while not transmitting the digital wireless data to be received from the wireless terminal to the digital public communication line Receiving control means for receiving the digital wireless data by using a second number of wireless slots smaller than the first number. 11. The communication device according to claim 1, wherein the communication device is a facsimile device.