JPH1032652A - Multimedia communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently use plural lines and plural terminals by constituting one multimedia communication system of plural slave terminals with a terminal function and a master terminal with a transmission function. SOLUTION: The system consists of the plural slave terminals ST 1 to 3 with a terminal function for multimedia communication and one master terminal TM with the transmission function for multimedia communication, transmits and receives data between them by radio. In addition the master terminal TM is provided with a call control function with respect to plural ISDN line, a packet communication function between with the plural slave circuits, a connection function with an ISDN line, a multi-transmission function, etc. As a slave terminal in the process of executing communication is properly switched to another slave terminal, a circuit efficiency is satisfactory and one-to-many or many-to-many communication is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a master terminal device for performing multiplexed multimedia communication with a partner terminal via a public network, and a multimedia terminal function.
The present invention relates to a multimedia communication system including a plurality of slave terminal devices that exchange multimedia data with the master device wirelessly.

[0002]

2. Description of the Related Art For example, as a device for performing multiplexed multimedia communication with a partner terminal via a public network, a video conference communication terminal device is known. In recent years, an application using ISDN has been known. It is gradually spreading.

[0003]

However, this video conference communication terminal device is based on one-to-one communication, and the same ISDN number is occupied by one terminal device and the line utilization rate is poor. Occurs.

[0004] Further, since a video conference communication terminal device usually needs to have all necessary functions, the cost of the device is large, which hinders its spread. Also, once the device is installed, it is difficult to move from the installation location, and there has been a situation in which the usability is poor.

The present invention has been made in view of such circumstances, and has as its object to provide an easy-to-use multimedia communication system having a good line utilization rate.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a master terminal device connected to a public network and performing multiplexed multimedia communication with a partner terminal via the public network, and a multimedia terminal function. A plurality of slave terminal devices that exchange multimedia data wirelessly with the master device, wherein the master terminal device is connected via a public network based on identification information assigned to each of the plurality of slave terminal devices. The plurality of slave terminal devices that exchange data with the partner terminal to be connected are identified, and one of the plurality of slave terminal devices is exchanged between the slave terminal device and the partner terminal.
While performing one-to-one multimedia communication, the master terminal device executes the multimedia communication and the exchange of multimedia data with the slave terminal device in parallel. Further, exchange of multimedia data between the master terminal device and the slave terminal device is performed by a packet communication function using packet data classified for each media data. In addition, a priority order is set for each piece of the media data for the packet data classified for each piece of the media data.

[0007] Further, when a transfer request is made in a state where a transfer destination slave terminal device is specified by the slave terminal device during multimedia communication, the master terminal device performs multimedia communication at that time. In this case, the communication is switched to the multimedia communication between the destination terminal and the specified destination slave terminal device.

A master terminal device connected to a public network and performing multiplexed multimedia communication with a partner terminal via the public network; and a multimedia terminal function.
It comprises a plurality of slave terminals that exchange multimedia data with the master device wirelessly, and the master terminal device is connected via a public network based on identification information assigned to each of the plurality of slave terminal devices. The plurality of slave terminal devices that exchange data with a partner terminal that performs communication are identified, and one-to-many multimedia communication is performed between the slave terminal device and the partner terminal.

A master terminal device connected to a public network and performing multiplexed multimedia communication with a partner terminal via the public network; and a multimedia terminal function.
It comprises a plurality of slave terminals that exchange multimedia data with the master device wirelessly, and the master terminal device is connected via a public network based on identification information assigned to each of the plurality of slave terminal devices. The plurality of slave terminal devices that exchange data with a partner terminal that performs communication are identified, and many-to-many multimedia communication is performed between the slave terminal device and the partner terminal.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

FIG. 1 shows an example of a multimedia communication system according to an embodiment of the present invention.

Referring to FIG. 1, the multimedia communication system includes a plurality of (in this case, three) slave terminals TS1 and T2 each having a terminal function for multimedia communication.
S2, TS3, and one master terminal TM having a transmission function for multimedia communication. Data exchange between the slave terminals TS1, TS2, TS3 and the master terminal TM is performed by wireless transmission. .
Further, the master terminal TM accommodates a plurality of lines (in this case, ISDN lines).

Each slave terminal TS1, TS2,
The TS 3 has, as terminal functions, an input / output function of audio information, an input / output function of moving image information, and an input / output function of general-purpose data (including control data). It has a packet communication function for communication between devices.

The master terminal TM has a plurality of ISDs.
Call control function for N lines, multiple slave terminals TS
Packet communication function between the slave terminals TS1, TS2, and TS3, the connection function between each of the slave terminals TS1, TS2, and TS3 and the ISDN line to be used; 221 multiplex transmission function.

Here, the slave terminals TS1, TS2, T
Data exchange between S3 and master terminal TM by wireless data transmission (packet communication) is a so-called wireless L
It can be realized by a data transmission function by an AN (local area network).

Then, the slave terminals TS1, TS2, T
By combining the S3 and the master terminal TM, this multimedia communication system is compliant with ITU-T Recommendation H.264. 32
It functions as a teleconference communication terminal device defined as 0. Therefore, this multimedia communication system can perform data communication with the video conference communication terminal device.

Further, as described above, this multimedia communication system is entirely based on ITU-T Recommendation H.264. 32
In order to function as a teleconference communication terminal device of ITU-T Recommendation H.0. It has a device function and a transmission function specified in 320. In the following description, this I
TU-T Recommendation H. The description will be made on the premise of 320 and the related recommendations, and a detailed description of those recommendations will be omitted.

Next, the master terminal TM and the slave terminal T
Packet data applied in wireless data transmission (packet communication) between S (TS1, TS2, TS3) will be described.

The packet data is classified into two types, a control packet applied for performing call control and the like and a data packet applied for exchanging various data such as voice data.

The control packet includes the slave terminal T
S is a call packet for requesting the master terminal TM to make a call to the communication partner terminal, and a capability packet for the master terminal TM notifying the slave terminal TS of a capability value (described later) used in multimedia communication. An incoming packet for the master terminal TM to notify the slave terminal TS of an incoming call; a response packet for the slave terminal TS to notify the master terminal TM that the requested communication is to be accepted; TM
A transfer packet for requesting the slave terminal TS to move the communication currently being executed to the master terminal TM to another slave terminal TS. A transfer notification packet for notifying the TS that a transfer request has been received from another slave terminal TS, and a transfer response indicating that the slave terminal TS accepts the transfer request notified to the master terminal TS. There are packets and so on.

The data packet includes an audio packet for transmitting audio data and a video packet for transmitting moving image data. The data received from the partner terminal is transmitted from the master terminal TM to the slave terminal TS using these data packets, and the data transmitted from the terminal itself to the partner terminal is the data The packet is transmitted from the slave terminal TS to the master terminal TM using a packet. That is, data packets are exchanged bidirectionally.

FIG. 2 shows an example of an outgoing call packet.

The call packet includes a priority type (to be described later) of the (call) packet, a device number assigned to the transmission source slave terminal TS, and a packet type of the call packet (in this case, "control packet"). )), The command type (“calling”) indicating that this packet is a calling packet, the number of telephone numbers for which calling is requested (= N (usually “2”)), and the telephone number of the calling request. The list includes a telephone number first line to a telephone number N-th line, a terminal capability number of the terminal itself used for data transmission requested for calling, and a list of respective capability values to be used. Here, the capability value is defined in ITU-T Recommendation H.264. 221 can be used.

FIG. 3 shows an example of the capability packet.

The capability packet includes the priority type of the (capability) packet, the device number assigned to the slave terminal TS of the receiving destination, the packet type of the capability packet (in this case, “control packet”), and Command type (“ability”) indicating that the packet is a capability packet,
Number of terminal common capabilities indicating the number of capability values (BAS capability values) notified as common capabilities, list of the notified capability values, number of BAS commands indicating the number of BAS commands received at the time of mode switching, and reception thereof It consists of a list of changed mode switching values.

FIG. 4 shows an example of an incoming packet.

The incoming packet includes a priority type of the (incoming) packet, a device number assigned to the transmission source slave terminal TS, a packet type of the incoming packet (in this case, “control packet”), and Command type ("incoming") indicating that the packet is an incoming packet,
And a destination telephone number.

FIG. 5 shows an example of the response packet.

The response packet includes the priority type of the (response) packet, the device number assigned to the transmission source slave terminal TS, the packet type of the response packet (in this case, "control packet"), and Command type ("Response") indicating that the packet is a response packet,
It includes a destination telephone number, a terminal capability number indicating the number of capability values (BAS capability values) to be notified to the partner terminal as a common capability, and a list of the capability values.

FIG. 6 shows an example of the disconnection packet.

The disconnection packet includes a priority type of the (disconnection) packet, a device number assigned to the transmission source slave terminal TS, a packet type of the disconnection packet (in this case, “control packet”), and Command type ("disconnection") indicating that the packet is a disconnection packet,
The number of telephone numbers to be disconnected (= N (usually "2")), and a telephone number first line to a telephone number N-th line which is a list of telephone numbers to be disconnected.

FIG. 7 shows an example of the transfer packet.

The transfer packet includes a priority type of the (transfer) packet, a device number assigned to the transmission source slave terminal TS, a packet type of the transfer packet (in this case, “control packet”), and Command type ("Transfer") indicating that the packet is a transfer packet,
And a transfer destination device number indicating a device number assigned to the transfer destination slave terminal TS.

FIG. 8 shows an example of the transfer notification packet.

The transfer notification packet includes the priority type of the (transfer notification) packet, the device number assigned to the slave terminal TS of the receiving destination, the packet type of the transfer notification packet (in this case, “control packet”), A command type (“transfer notification”) indicating that this packet is a transfer notification packet, the number of destination telephone numbers (= N (normally “2”)) indicating the number of telephone numbers of the partner terminal in use, and , Which is a list of the telephone numbers of the other party's terminals, that is, the first line to the Nth line of the other party's telephone number.

FIG. 9 shows an example of the transfer response packet.

The transfer response packet includes the priority type of the (transfer response) packet, the device number assigned to the transmission source slave terminal TS, the packet type of the transfer response packet (in this case, “control packet”), The command type (“transfer response”) indicating that this packet is a transfer response packet, the number of destination telephone numbers (= N (normally “2”)) indicating the number of telephone numbers of the destination terminal to respond, the destination terminal Number of terminal capabilities representing the number of capability values (BAS capability values) that can be used by the own terminal, and their capabilities Consists of a list of values.

FIG. 10 shows an example of a voice packet.

This voice packet is based on the priority type of the (voice) packet, the source or destination slave terminal TS.
, The packet type (“voice”) indicating that this packet is a voice packet, the number of encoded data included in this voice packet,
And encoded data constituting a set of audio data. The coded data constituting this set of audio data is described in, for example, ITU-T Recommendation G. 728
Coded data for one frame in the audio CODEC specified in the above.

FIG. 11 shows an example of a video packet.

This video packet is composed of the priority type of this (video) packet, the source or destination slave terminal TS.
, The packet type (“video”) indicating that this packet is a video packet, the number of encoded data included in this video packet,
And encoded data constituting a set of video data. Examples of the coded data that constitute this unit of video data include, for example, ITU-T Recommendation H.264.
1 GO in the moving image CODEC specified in H.261
B coded data or coded data obtained in a predetermined synchronization cycle can be used.

In the control packet, "packet type" is used as an information element for identifying the packet.
And "command type" are used. In a data packet, only "packet type" is used as an information element for identifying the packet. This is because there is a demand for shortening the time required for discriminating the packet type as much as possible because real-time performance is required, whereas control packets do not require real-time performance but have many types.

Further, since the "packet type" is defined as the third information element of the packet, the contents of the packet can be determined more quickly, and the processing of the audio packet and the video packet is started earlier. Therefore, processing of audio data and video data can be performed smoothly.

Next, the priority order assigned to each packet will be described.

The priorities (priority types) are set based on the characteristics of the data carried by each packet. For example, audio data has a strong real-time property, and if the data is lost, the audio quality is significantly deteriorated. Therefore, the highest priority type is set, and the video data is set to the priority type next to the audio data.

On the other hand, a lower priority type is set for the control packet since real-time processing is not required when processing the data of the control packet.

Then, between the slave terminal TS and the master terminal TM, data is transmitted sequentially from the packet having the highest priority type. That is, in this case, if there is an audio packet, the audio packet is transmitted with the highest priority, and then the video packet is transmitted with the highest priority. The control packet is transmitted during a period when neither the audio packet nor the video packet is transmitted.

Thus, packet communication (wireless data transmission) between slave terminal TS and master terminal TM
In, by assigning a priority type to a packet, it is possible to realize high-quality multimedia communication.

Each of the above-mentioned packets is exchanged in a signal format defined by a wireless transmission function (wireless LAN) actually used. As such a wireless transmission function, for example, there is a wireless LAN or the like for which standardization work is being carried out by IEEE 802.11WG.

FIG. 12 shows an example of the configuration of the master terminal TM.

In the figure, a line interface control unit LC accommodates n ISDN lines (I interfaces), and for each line, a signal processing function of an ISDN layer 1 and a signal of a D channel and two B channels. The signal of the D channel is exchanged with the call control processing unit PC, and the signals of the two B channels of each line are multiplexed / separated control units PP1 to PPn. I'm interacting with

The call control processing unit PC performs a D channel layer 2 signal processing function for n lines,
It has a call control processing function for connecting / releasing one or two B channels.

The multiplexing / demultiplexing control units PP1 to PPn
Multiplexes data of multiple media such as audio, video, and general-purpose data exchanged using channels, and
TU-T Recommendation H. In addition to forming frame data specified in H.221 and sending it to the line side, it separates data of a plurality of media multiplexed with the received frame data. For the data on the terminal side, the multiplexing / demultiplexing control units PP1 to PPn transmit the voice data to or from any one of the line-side input / output ports of the voice packet processing unit APm via the switching control unit XC. The video data is exchanged with any one of the line-side input / output ports of the video packet processing unit VPm via the switching control unit XC, and the general-purpose data is exchanged with the system control unit SCm. I'm interacting with

The switching control unit XC receives a command from the system control unit SCm to control the multiplexing / demultiplexing control unit PP1.
For switching the line-side input / output port of the audio packet processing unit APm and the line-side input / output port of the video packet processing unit VPm for exchanging the audio data and the video data of .about.PPn.

The voice packet processing unit APm performs packetization processing and unpacketization processing for exchanging voice packets with the slave terminal TS. The port number of the line side input / output port, the voice packet The relationship with the slave terminal TS with which the
It is defined on a one-to-one basis.

The video packet processing section VPm performs packetization processing and unpacketization processing for exchanging video packets with the slave terminal TS. The port number of the line side input / output port, the video packet The relationship with the slave terminal TS with which the
It is defined on a one-to-one basis.

The control packet processing unit CPm performs packetization processing and unpacketization processing for exchanging various control packets with the slave terminal TS.

The radio control unit RRm determines the type of the received packet based on the radio signal received via the antenna ATm, and converts the received signal according to each packet type into the audio packet processing unit APm and the video packet processing unit VPm.
And output to the control packet processing unit CPm,
Audio packet processing unit APm, video packet processing unit VPm
And converts a signal received from the control packet processing unit CPm into a wireless signal, and sends the wireless signal to the slave terminal TS via the antenna ATm.

The system control unit SCm controls the operation of the master terminal TM, and includes a call control processing function and ITU-T Recommendation H.264. Various processing functions such as a 242 transmission procedure function are provided.

FIG. 13 shows an example of the configuration of the slave terminal TS.

In the figure, a microphone MM is for inputting audio information, and its output signal is applied to an analog signal input terminal of the audio processing unit AA. The voice processing unit AA has a voice CODEC function and an echo canceller function. The voice processing unit AA encodes a voice signal input from the microphone MM and outputs it to the voice packet processing unit APs. The audio data is decoded into an original audio signal, and the decoded received audio signal is output to the speaker SP. In addition, the audio processing unit AA removes an echo component included in the audio signal input from the microphone MM when the received audio output from the speaker SP is input from the microphone MM.

The video camera device VC is for taking a picture of the user of the slave terminal TS,
The moving image signal output from the video camera device VC is
It is applied to the video signal input terminal of the video codec VV.

The moving image codec VV converts an analog NTSC format moving image signal input from the video camera device VC into corresponding digital moving image data, converts the moving image data into predetermined CIF format moving image data, TTC standard JT-H. H.261, the video packet processing unit VPs
And the received moving image information in the coded and compressed state input from the video packet processing unit VPs
F-format video data and convert the video data to NTS
The moving image data is converted into the moving image data in the C format, and the moving image data is converted from digital to analog and converted into the received moving image signal in the analog NTSC format. The received moving image signal is output to the video monitor device VM. The received video is displayed on the monitor device VM.

The operation display section DP is connected to the slave terminal TS.
And its input / output signals are exchanged between the system control units SCs.

The voice packet processing unit APs forms a transmission voice packet based on the transmission voice data input from the voice processing unit AA, and transmits the transmission voice packet to the radio control unit R.
In addition to outputting the received voice data to the voice processing unit AA, the received voice data is output to the voice processing unit AA by unpackaging the received voice packet input from the wireless control unit RRs.

The video packet processing unit VPs forms a transmission video packet based on the transmission video data input from the video codec VV, outputs the transmission video packet to the radio control unit RRs, and inputs the transmission video packet from the radio control unit RRs. The received video packet is unpacketized to form received video data, and the received video data is
V.

The control packet processing unit CPs forms a transmission control packet based on the control signal input from the system control unit SCs, and transmits the transmission control packet to the radio control unit Rs.
Rs, and unpackets the reception control packet input from the radio control unit RRs to form reception control data, and transmits the reception control data to the system control unit SCs
Is output to

The radio control unit RRs determines the type of the received packet based on the radio signal received via the antenna ATs, and converts the received signal according to each packet type into the audio packet processing unit APs and the video packet processing unit VPs
And output to the control packet processing unit CPs,
Audio packet processing unit APs, video packet processing unit VPs
And converts the signal input from the control packet processing unit CPs into a radio signal, and transmits the radio signal to the master terminal TM via the antenna ATs.

The system control unit SCs controls the operation of the slave terminal TS. Each slave terminal TS is assigned a sub-address (extension number) for each of the two B channels used so that the master terminal TM can identify the designated slave terminal TS at the time of an incoming call.

In the above configuration, for example, the slave terminal TS
When the user 1 performs a calling operation by designating a partner terminal, the user of the slave terminal TS1 operates the operation display unit DP to perform a call request operation with two telephone numbers of the partner terminal specified.

As a result, the system control unit SCs forms the information element of the above-mentioned call packet and outputs it to the control packet processing unit CPs. In this case, the device number
Set the value of the device number assigned to your terminal,
"2" is set to the number of telephone numbers for which a call is requested, the first telephone number and the second telephone number are set as a list of telephone numbers for which a call is requested, and the capability value to be used is set. In the list, capability values provided in the own terminal are set.

The control packet processing unit CPs forms this call packet, and the call packet is transmitted to the radio control unit RR.
s, and is received as a wireless signal by the wireless control unit RRm of the master terminal TM.

In the master terminal TM, the radio control unit RRm
Outputs the call packet to the control packet processing unit CPm,
The control packet processing unit CPm unpackets the call packet and transmits the information element (call information) to the system control unit SCm via the input / output port (including the logical port) corresponding to the device number at that time. Output to

System control unit SCm performs a call operation to a designated destination based on the input call information. At this time, the slave terminal TS requesting the call operation is determined by the port number of the input / output port to which the call information is input.
Recognize 1.

Thereafter, the system control unit SCm starts the first
When a call setup operation is performed for the channel and a B channel is established with the partner terminal for the first channel, a call setup operation is performed for the second channel, and the B channel is established with the partner terminal for the second channel. Establish, establish inter-channel synchronization between the first channel and the second channel, and start a video conference communication session using two B channels.

When the first channel is established, the system control unit SCm exchanges the capability of data transmission using the first channel and sets the capability with the partner terminal, and establishes the second channel. When the inter-channel synchronization is established, the capability exchange and the capability setting of data transmission using the two B channels of the first channel and the second channel are performed with the partner terminal.

When the capability setting is completed at each time, the above-described capability packet for notifying the capability value set at that time is formed, and the slave terminal TS1 is formed.
Send to Thereby, the slave terminal TS1
Sets the operation mode (codec system or the like) of the audio processing unit AA and the moving image codec VV according to the notified capability value.

During data transmission, multiplexing /
Any one of the demultiplexing control units PP1 to PPn is assigned to the video conference communication session at that time, and the line side of the allocated multiplexing / demultiplexing control units PP1 to PPn is transmitted via the line interface control unit LC. Connect to the established first and second channels,
The assigned multiplexing / demultiplexing control units PP1 to PPn are connected to the input / output ports of the audio packet processing unit APm and the video packet processing unit VPm corresponding to the slave terminal TS1 at that time via the switching control unit XC. Connect to

Thus, after this, the master terminal T
M and the slave terminal TS1, audio packets and video packets are exchanged, and the slave terminal TS1
Video conference communication is performed between the user of the other terminal and the user of the partner terminal.

When the video conference communication is completed, the user of the slave terminal TS1 inputs an operation end of the video conference communication session from the operation display section DP.

As a result, the system control unit SCs forms the information element of the above-mentioned disconnection packet and outputs it to the control packet processing unit CPs. In this case, the device number
Set the value of the device number assigned to your terminal,
"2" is set as the number of telephone numbers for which disconnection is requested, and the first telephone number and the second telephone number are set as a list of telephone numbers for which disconnection is requested.

The control packet processing unit CPs forms this disconnection packet, and the disconnection packet is transmitted to the radio control unit RR.
s, and is received as a wireless signal by the wireless control unit RRm of the master terminal TM.

In the master terminal TM, the radio control unit RRm
Outputs the disconnection packet to the control packet processing unit CPm,
The control packet processing unit CPm unpackets the disconnection packet and transmits the information element (disconnection information) to the system control unit S via the input / output port corresponding to the device number at that time.
Output to Cm.

System control unit SCm performs a call release operation on a line that has established a B channel with a designated telephone number based on the input disconnection information. Thereby, the video conference communication performed by the slave terminal TS1 at that time ends.

Further, the user of the slave terminal TS1 ends the video conference communication on the way, and the other user (for example,
When switching to the slave terminal TS2 (user of the slave terminal TS2), the user of the slave terminal TS1 operates the transfer request with the device number of the slave terminal TS2 of the transfer destination user specified.

Thus, the system control unit SCs forms the information element of the transfer packet described above and outputs it to the control packet processing unit CPs. In this case, the device number
Set the value of the device number assigned to your terminal,
In the transfer destination device number, the value of the device number of the designated transfer destination slave terminal TS2 is set.

The control packet processor CPs forms a transfer packet, and the transfer packet is received as a radio signal by the radio controller RRm of the master terminal TM via the radio controller RRs.

In master terminal TM, radio control unit RRm
Outputs the transfer packet to the control packet processing unit CPm,
The control packet processing unit CPm unpackets the transfer packet and outputs the information element to the system control unit SCm via the output port corresponding to the device number at that time.

Thus, the system control unit SCm, based on the input transfer signal, specifies the designated slave terminal T
The transfer operation to S2 is performed.

First, the system control unit SCm identifies two B channels executing the video conference communication session requested to be transferred at that time, and transmits a transfer notification for notifying the telephone numbers of the two B channels. It forms information and outputs the transfer notification information to the control packet processing unit CPm via the input / output port of the transfer destination slave terminal TS2.

Thus, the control packet processing unit CPm
Forms a transfer notification packet, and the transfer notification packet is received by the wireless control unit RRs of the slave terminal TS2 as a wireless signal via the wireless control unit RRm.

In the slave terminal TS2, the radio control unit RR
s outputs the transfer notification packet to the control packet processing unit CPs, and the control packet processing unit CPs unpackets the transfer notification packet and outputs the information element to the system control unit SCs as transfer notification information.

When receiving the transfer notification information, the system control unit SCs displays a screen indicating that the transfer notification has been made on the operation display unit DP, and waits until the user responds. At this time, a calling operation using a ringing tone can be involved. When the user who sees the display inputs a response to the transfer from the operation display unit DP, the system control unit SCs forms the information element of the transfer response packet described above and outputs it to the control packet processing unit CPs. In this case, the value of the device number assigned to the own terminal is set as the device number, "2" is set as the number of transfer destination telephone numbers, and the first line of the destination telephone number and the destination telephone number are set. The notified telephone number of the first channel and the telephone number of the second channel are respectively set to the second line. In the list of the capability values to be used, the capability values provided in the own terminal are set.

The control packet processing unit CPs forms this transfer response packet, and the transfer response packet is transmitted as a radio signal to the master terminal TM via the radio control unit RRs.
Is received by the wireless control unit RRm.

In master terminal TM, radio control unit RRm
Outputs the transfer response packet to the control packet processing unit CPm, and the control packet processing unit CPm unpackets the transfer response packet, and outputs the information element (transfer response information) of the input / output port corresponding to the device number at that time. To the system control unit SCm via.

The system control unit SCm prepares, based on the input transfer response information, the capability value used in the video conference communication session being executed at that time and the common capability value in the transfer destination slave terminal TS2. Find out if it is. At this time, the capability value of the slave terminal TS2 is
If it does not coincide with the used capability value, a capability value common to the stored capability value of the partner terminal is determined, and the mode is switched to the common capability value. Also, the slave terminal TS2
However, if the device has a used capacity value, the used capacity value is determined as a common capacity value.

When the common capability value of the slave terminal TS2 and the partner terminal is set in this way, the system control unit SCm sends the multiplexing / demultiplexing control units PP1 to PPn assigned at this time to the terminal side. Is connected to the input / output ports of the audio packet processing unit APm and the video packet processing unit VPm corresponding to the transfer destination slave terminal TS2 via the switching control unit XC. Slave terminal TS2
Then, the operation mode of the audio processing unit AA and the moving image codec VV is set according to the notified capability value.

Thus, after this, the master terminal T
Audio packets and video packets are exchanged between M and the slave terminal TS2, whereby video conference communication is performed between the user of the slave terminal TS2 and the user of the partner terminal.

When a call is received from any of the partner terminals and an incoming call is detected, the system control unit SCm of the master terminal TM sends the slave terminal TS corresponding to the subaddress specified at that time, for example, the slave terminal TS3.
Is recognized as the destination slave terminal TS.

Then, the system control unit SCm forms the information element of the above-mentioned incoming packet and outputs it to the control packet processing unit CPm via the input / output port corresponding to the destination slave terminal TS3.

Thus, the control packet processing unit CPm
Forms this incoming packet, and the incoming packet
Via the radio control unit RRm, the radio signal is received by the radio control unit RRs of the destination slave terminal TS3 as a radio signal.

In the slave terminal TS3, the radio control unit RR
s outputs the incoming packet to the control packet processing unit CPs, and the control packet processing unit CPs unpackets the incoming packet and outputs the information element to the system control unit SCs as incoming information.

Upon receiving the transfer notification information, the system control unit SCs displays a screen indicating that there is an incoming call notification on the operation display unit DP, and waits until the user responds. At this time, a calling operation using a ring tone can be further involved. When the user who sees the display inputs an operation to respond to the incoming call from the operation display unit DP, the system control unit SCs
Forms an information element of the above-mentioned response packet and outputs it to the control packet processing unit CPs. In this case, the value of the device number assigned to the own terminal is set as the device number, and the notified telephone number is set as the destination telephone number. In the list of the capability values to be used, the capability values provided in the own terminal are set.

The control packet processing unit CPs forms this response packet, and the response packet is transmitted to the radio control unit RR.
s, and is received as a wireless signal by the wireless control unit RRm of the master terminal TM.

In master terminal TM, radio control unit RRm
Outputs a response packet to the control packet processing unit CPm,
The control packet processing unit CPm unpackets the response packet and transmits the information element (response information) to the system control unit S via the input / output port corresponding to the device number at that time.
Output to Cm.

As a result, the system control unit SCm sends a response message to the partner terminal of the notified telephone number, and thereafter executes a predetermined incoming call procedure.
Establish a call with the partner terminal.

Also, at this time, since the call setting of the first channel has been performed, the call of the additional channel (second channel) is continuously performed from the partner terminal. When the call setting operation similar to the above is performed on the additional channel and the second channel is established with the partner terminal, inter-channel synchronization between the first channel and the second channel is established, and the two B channels are established. The video conference communication is performed between the partner terminal and the slave terminal TS3 by using this.

When the first channel is established, the system control unit SCm exchanges capabilities and sets the capability of data transmission using the first channel with the partner terminal, and establishes the second channel. When the inter-channel synchronization is established, the capability exchange and the capability setting of data transmission using the two B channels of the first channel and the second channel are performed with the partner terminal.

When the capability setting is completed at each time, the above-described capability packet for notifying the capability value set at that time is formed, and the slave terminal TS3 is formed.
Send to Thereby, the slave terminal TS3
Sets the operation mode (codec system or the like) of the audio processing unit AA and the moving image codec VV according to the notified capability value.

During data transmission, multiplexing /
One of the demultiplexing control units PP1 to PPn is assigned to the current video conference communication session, and the line side of the assigned multiplexing / demultiplexing control unit PP1 to PPn is transmitted via the line interface control unit LC. Multiplexing / demultiplexing control unit PP1 connected to the first and second channels established
To PPn are connected to input / output ports corresponding to the slave terminal TS3 in the audio packet processing unit APm and the video packet processing unit VPm via the switching control unit XC.

As described above, in the present embodiment, a call operation to a designated destination is performed by a call operation from one of the slave terminals TS, and two B channels are communicated with the other terminal. A video conference communication session is established using the two B channels.

Further, since the video conference communication session under communication can be transferred to another slave terminal TS,
A video conference communication session can be delivered from one user to another user, a video conference communication session in a communication mode desired by the user can be realized, and the usability of the video conference communication is improved.

Further, since the video conference communication session can be transferred to another slave terminal TS while maintaining the same call connection, the line utilization rate is improved.

FIG. 14 shows a processing example of the master terminal TM for exchanging control packets.

The master terminal TM detects an incoming call or monitors reception of a control packet from any one of the slave terminals TS (NO loop of judgments 101 and 102). Incoming call is detected and the result of judgment 101 is YE
In S, a predetermined incoming call process (process 103) is executed, and the process returns to the determination 101.

When a control packet is received from any of the slave terminals TS and the result of determination 102 is YES, whether the control packet is a call packet, a response packet, or a transfer packet To determine whether the packet is a transfer response packet (decisions 104, 105, 10
6, 107).

If the received control packet is a call packet and the result of decision 104 is YES, a predetermined call packet processing (processing 108) is executed, and a decision 10 is made.
Return to 1.

If the received control packet is a response packet and the result of determination 105 is YES, predetermined response packet processing (processing 109) is executed.
Return to decision 101.

If the received control packet is a transfer packet and the result of determination 106 is YES, a predetermined transfer packet process (process 110) is executed,
Return to decision 101.

If the received control packet is a transfer response packet and the result of decision 107 is YES, a predetermined transfer response packet process (process 111) is executed, and the process returns to decision 101.

FIG. 15 shows an example of the incoming call process (process 103).
Shown in

First, the received call setup message SETU
The slave terminal TS corresponding to the “sub-address” information element of P is recognized as the destination slave terminal TS, and the information element of the above-mentioned incoming packet is formed (process 121).
The incoming packet is transmitted to the destination slave terminal TS (process 122).

FIG. 16 shows an example of the outgoing call packet process (process 108).

First, an information element is extracted from the received outgoing call packet (process 131), and a calling procedure process for making a call to the designated destination is executed (process 132) to synchronize the signal with the partner terminal. Is established (process 133), and a communication path is formed.

Then, by editing a capability packet for notifying the capability value set at that time with the partner terminal to the slave terminal TS of the call request source, the slave terminal T
S is transmitted to (S134).

FIG. 17 shows the response packet processing (processing 10
9) shows an example.

First, an information element is extracted from the received response packet (process 141), and a response message CONNECT is sent to the ISDN to make an incoming call response (process 142).
As a result, when a call is set, signal synchronization is established with the partner terminal (process 143), and a communication path is formed.

Then, a capability packet for notifying the slave terminal TS of the called party of the capability value set at that time with the partner terminal is edited and transmitted to the slave terminal TS (process 144). .

FIG. 18 shows the transfer packet processing (processing 11
0).

First, the transfer notification packet is edited and transmitted to the transfer destination slave terminal TS (process 151).

FIG. 19 shows a transfer response packet process (process 1).
11) shows an example.

First, a capability packet for notifying the transfer destination slave terminal TS of the capability value used in the video conference communication session at that time is edited, and the capability packet is transmitted to the transfer destination slave terminal TS. Yes (Process 16
1).

Next, the connection destination of the audio packet and the video packet is switched to the transfer destination slave terminal TS (Process 1).
62, 163).

FIG. 20 shows a processing example of the slave terminal TS for exchanging control packets.

The slave terminal TS monitors whether the telephone number of the call destination is input from the user, whether a control packet is received from the master terminal TM, or whether a transfer request is input by the user. (Decisions 201,
02, 203 NO loop). When the telephone number of the call destination is input by the user and the result of determination 201 is YES, a predetermined call packet transmission process (process 204)
And returns to the decision 201.

When a control packet is received from master terminal TM and the result of determination 202 is YES, whether the control packet is a capability packet, an incoming call packet, or a transfer notification packet Is determined (determinations 205, 206, 207).

If the received control packet is a capability packet and the result of determination 205 is YES, a predetermined capability packet process (process 208) is performed, and the process returns to determination 201.

If the received control packet is an incoming call packet and the result of judgment 206 is YES, a predetermined incoming packet process (process 209) is executed, and the process returns to judgment 201.

If the received control packet is a transfer notification packet and the result of determination 207 is YES, a predetermined transfer notification packet process (process 210) is executed, and the process returns to determination 201.

If the user inputs a transfer request and the result of determination 203 is YES,
A predetermined transfer request packet process (process 211) is executed, and the process returns to the determination 201.

FIG. 21 shows a call packet transmission process (process 2).
04).

First, the call packet in which the telephone number of the designated destination is set is edited (process 221), and the call packet is transmitted to the master terminal TM (process 222).

FIG. 22 shows the capability packet processing (processing 20).
8) shows an example.

First, the information element of the capability packet is extracted (process 231), and it is checked whether the audio capability is set (decision 232). If the audio capability is set and the result of determination 232 is YES, the operation mode of the audio processing unit AA is set corresponding to the specified audio capability (process 233).

Next, it is checked whether the video capability is set (decision 234). If the video capability is set and the result of determination 234 is YES, the operation mode of the moving image codec VV is set corresponding to the specified video capability (process 235).

FIG. 23 is a flow chart showing an incoming call packet process (process 20).
9) shows an example.

First, an information element of an incoming call packet is extracted (process 241), an incoming call is displayed on the operation display OP (process 242), and the process waits until the user performs an incoming call response operation (process 43). At this time, a user calling operation such as ringing a ringing tone can be performed. When the user answers the incoming call, the user edits a response packet indicating that fact and transmits the edited response packet to the master terminal TM (process 244).

FIG. 24 shows the transfer notification packet processing (processing 2
10) shows an example.

First, a transfer display indicating that a transfer request has been made is performed (step 251). When the user performs a transfer response operation, the transfer response packet is edited and transmitted to the master terminal TM.

FIG. 25 shows an example of the transfer request packet transmission processing (processing 211).

First, the designated transfer destination slave terminal T
The transfer packet designating S is edited (process 261), and the transfer packet is transmitted to the master terminal TM (process 2).
62).

In the above-described embodiment, audio data and video data are exchanged as multimedia data. However, user data (general-purpose data) such as telewriting data can be multiplexed and exchanged. .

FIG. 26 shows an example of the configuration of a master terminal TM according to another embodiment of the present invention in that case. In this figure, the same parts as those in FIG. 12 and the corresponding parts are denoted by the same reference numerals.

In the figure, a line interface control unit LC accommodates n ISDN lines (I interfaces), and for each line, a signal processing function of ISDN layer 1 and a signal of D channel and two B channels. The signal of the D channel is exchanged with the call control processing unit PC, and the signals of the two B channels of each line are respectively multiplexed / separated control units PQ1 to PQn. I'm interacting with

The call control processing unit PC performs the D channel layer 2 signal processing function and the 1
It has a call control processing function for connecting / releasing one or two B channels.

The multiplexing / demultiplexing control units PQ1 to PQn
Multiplexes data of multiple media such as audio, video, and general-purpose data exchanged using channels, and
TU-T Recommendation H. In addition to forming frame data specified in H.221 and sending it to the line side, it separates data of a plurality of media multiplexed with the received frame data. For data on the terminal side, the multiplexing / demultiplexing control units PQ1 to PQn transmit voice data to and from one of the line-side input / output ports of the voice packet processing unit APm via the switching control unit XD. The video data is exchanged with any one of the line-side input / output ports of the video packet processing unit VPm via the switching control unit XD, and the switching control unit XD is used for the telewriting data of the general-purpose data. And exchanges with any one of the line-side input / output ports of the user data packet processing unit UPm via the PC, and other general-purpose data with the system control unit SCm.

The switching control section XD receives a command from the system control section SCm to control the multiplexing / demultiplexing control section PQ1.
Packet processing unit APm for exchanging audio data, video data and user data of PQn to PQn
To switch the line-side input / output port of the video packet processing unit VPm and the line-side input / output port of the user data packet processing unit UPm.

The audio packet processing unit APm performs packetization processing and unpacketization processing for exchanging audio packets with the slave terminal TS, and includes a port number of a line side input / output port, an audio packet The relationship with the slave terminal TS with which the
It is defined on a one-to-one basis.

The video packet processing section VPm performs packetization processing and unpacketization processing for exchanging video packets with the slave terminal TS. The port number of the line side input / output port, the video packet The relationship with the slave terminal TS with which the
It is defined on a one-to-one basis.

The user data packet processing unit UPm performs packetization processing and unpacketization processing for exchanging user data packets with the slave terminal TS. The port number of the line side input / output port, The relationship with the slave terminal TS with which the user data packet is exchanged is defined on a one-to-one basis.

The control packet processing section CPm performs packetization processing and unpacketization processing for exchanging various control packets with the slave terminal TS.

The radio control unit RRm determines the type of the received packet based on the radio signal received via the antenna ATm, and converts the received signal according to each packet type into the audio packet processing unit APm and the video packet processing unit VP.
m, output to the user data packet processing unit UPm and the control packet processing unit CPm, and convert signals received from the audio packet processing unit APm, the video packet processing unit, the user packet processing unit UPmVPm, and the control packet processing unit CPm into radio signals. Then, the wireless signal is transmitted to the slave terminal TS via the antenna ATm.

The system control unit SCm controls the operation of the master terminal device TM, and includes a call control processing function and ITU-T Recommendation H.264. Various processing functions such as a 242 transmission procedure function are provided.

FIG. 27 shows an example of the configuration of the slave terminal TS according to this embodiment. In the figure,
The same parts as those in FIG. 13 and the corresponding parts are denoted by the same reference numerals.

In the figure, a microphone MM is for inputting audio information, and its output signal is applied to an analog signal input terminal of an audio processing unit AA. The voice processing unit AA has a voice CODEC function and an echo canceller function. The voice processing unit AA encodes a voice signal input from the microphone MM and outputs it to the voice packet processing unit APs. The audio data is decoded into an original audio signal, and the decoded received audio signal is output to the speaker SP. In addition, the audio processing unit AA removes an echo component included in the audio signal input from the microphone MM when the received audio output from the speaker SP is input from the microphone MM.

The video camera device VC is for taking a picture on the user side of the slave terminal TS.
The moving image signal output from the video camera device VC is
It is applied to the video signal input terminal of the video codec VV.

The moving image codec VV converts the moving image signal of the analog NTSC format input from the video camera device VC into moving image data of the corresponding digital data, converts the moving image data into moving image data of a predetermined CIF format, TTC standard JT-H. H.261, the video packet processing unit VPs
And the received moving image information in the coded and compressed state input from the video packet processing unit VPs
F-format video data and convert the video data to NTS
The moving image data is converted into the moving image data in the C format, and the moving image data is converted from digital to analog and converted into the received moving image signal in the analog NTSC format. The received moving image signal is output to the video monitor device VM. The received video is displayed on the monitor device VM.

The liquid crystal display device LL and the touch panel device TP constitute the operation display means of the slave terminal TS, and also constitute the input / output means of the telewriting application. This is for processing input / output data of the LL and the touch panel device TP.

The audio packet processing unit APs forms a transmission audio packet based on the transmission audio data input from the audio processing unit AA, and transmits the transmission audio packet to the radio control unit R.
In addition to outputting the received voice data to the voice processing unit AA, the received voice data is output to the voice processing unit AA by unpackaging the received voice packet input from the wireless control unit RRs.

The video packet processing unit VPs forms a transmission video packet based on the transmission video data input from the video codec VV, outputs the transmission video packet to the radio control unit RRs, and inputs the transmission video packet from the radio control unit RRs. The received video packet is unpacketized to form received video data, and the received video data is
V.

The user packet processing unit UPs forms a transmission user data packet based on the telewriting transmission data input from the input / output processing unit IP, outputs the transmission user data packet to the radio control unit RRs, and controls the radio control unit RRs. It unpackets the reception user data packet input from the section RRs to form reception telewriting data, and outputs the reception telewriting data to the input / output processing section IP.

The control packet processing unit CPs forms a transmission control packet based on the control signal input from the system control unit SCs, and transmits the transmission control packet to the radio control unit Rs.
Rs, and unpackets the reception control packet input from the radio control unit RRs to form reception control data, and transmits the reception control data to the system control unit SCs
Is output to

The radio control unit RRs determines the type of the received packet based on the radio signal received via the antenna ATs, and converts the received signal according to each packet type into the audio packet processing unit APs and the video packet processing unit VP.
s, output to the user packet processing unit UPs and the control packet processing unit CPs, and output the voice packet processing unit A
Ps, the video packet processing unit VPs, the user packet processing unit UPs, and the signals input from the control packet processing unit CPs are converted into radio signals, and the radio signals are converted into antennas AT.
s to the master terminal TM.

The system controller SCs controls the operation of the slave terminal TS. Each slave terminal TS is assigned a sub-address (extension number) for each of the two B channels used so that the master terminal TM can identify the designated slave terminal TS at the time of an incoming call.

In this case, the user data packet can be configured as a data packet having the same signal format as the audio packet and the video packet.

In the above embodiment, only one-to-one communication is possible. In order to execute the same video conference communication session between a plurality of partner terminals and a plurality of slave terminals TS, it is general to use a multipoint control device connected to the ISDN. By providing the master terminal TM with a sound mixing function and a video switching function, the same video conference communication session can be executed between a plurality of partner terminals and a plurality of slave terminals TS.

FIG. 28 shows a configuration example of the audio data processing means of master terminal TM in this case. In this figure, the same parts as those in FIG. 12 and the corresponding parts are denoted by the same reference numerals.

In the figure, the voice packet processing unit APm
Terminal TS1 output from the line-side output port of
Is transmitted from the audio data decoder DM0.
A1 converts it to the original transmission audio signal DO1, and the transmission audio signal DO1 is mixed with the mixing circuits MX2, MX3,
It is added to the input terminals of MX4, MX5, MX6 and the input terminal of the audio level judgment unit LV.

The transmission audio data AO2 from the slave terminal TS2 output from the line side output port of the audio packet processing unit APm is converted into the original transmission audio signal DO2 by the audio data decoder DMA2, and the transmission audio signal DO2 is output. DO2 is composed of mixing circuits MX1, MX3, MX4
Input terminals of MX5 and MX6, and audio level determination unit L
V input.

The transmission audio data AO3 from the slave terminal TS3 output from the line side output port of the audio packet processing unit APm is converted into the original transmission audio signal DO3 by the audio data decoder DMA3, and the transmission audio signal DO3 is output. DO3 includes mixing circuits MX1, MX2, MX4,
Input terminals of MX5 and MX6, and audio level determination unit L
V input.

The received audio data AI1 output from the multiplexing / demultiplexing control unit PP1 is output from the audio data decoder DM1.
B1 converts the received audio signal DI1 into the original received audio signal DI1, and the received audio signal DI1 is mixed with the mixing circuits MX1, MX2,
It is added to the input terminals of MX3, MX5, MX6 and the input terminal of the audio level determination unit LV.

The received audio data AI2 output from the multiplexing / demultiplexing control section PP2 is output from the audio data decoder DM2.
B2, the signal is converted into the original received audio signal DI2, and the received audio signal DI2 is mixed with the mixing circuits MX1, MX2,
It is added to the input terminals of MX3, MX4, MX6 and the input terminal of the audio level determination unit LV.

The received audio data AI3 output from the multiplexing / demultiplexing control section PP3 is supplied to an audio data decoder DM3.
B3 converts the received audio signal DI3 into the original received audio signal DI3.
It is added to the input terminals of MX3, MX4, MX5 and the input terminal of the audio level judgment unit LV.

The mixing circuit MX1 outputs the transmission audio signal D
O2, DO3 and received audio signals DI1, DI2, DI
3 and the output signal is applied to the audio data encoder MDA1 as an audio signal DO1 '.

The mixing circuit MX2 outputs the transmission audio signal D
O1, DO2 and received audio signals DI1, DI2, DI
3, and the output signal is applied to the audio data encoder MDA2 as an audio signal DO2 '.

The mixing circuit MX3 outputs the transmission audio signal D
O1, DO2 and received audio signals DI1, DI2, DI
3 is mixed, and the output signal is applied to the audio data encoder MDA3 as the audio signal DO3 '.

The mixing circuit MX4 outputs the transmission audio signal D
O1, DO2, DO3 and received audio signals DI2, DI
3 and the output signal is applied to the audio data encoder MDB1 as an audio signal DI1 '.

The mixing circuit MX5 outputs the transmission audio signal D
O1, DO2, DO3 and received audio signals DI1, DI
3 and the output signal is applied to the audio data encoder MDB2 as an audio signal DI2 '.

The mixing circuit MX6 outputs the transmission audio signal D
O1, DO2, DO3 and received audio signals DI1, DI
2 and the output signal is applied to the audio data encoder MDB3 as an audio signal DI3 '.

The audio data encoder MDA1 encodes the input audio signal DO1 'to form audio data AO1'. The audio data AO1 'is used as transmission audio data to be transmitted to the slave terminal TS1. Output to the packet processing unit APm.

The audio data encoder MDA2 encodes the input audio signal DO2 'to form audio data AO2'. The audio data AO2 'is used as transmission audio data to be transmitted to the slave terminal TS2. Output to the packet processing unit APm.

The audio data encoder MDA3 encodes the input audio signal DO3 'to form audio data AO3'. The audio data AO3 'is used as transmission audio data to be transmitted to the slave terminal TS3. Output to the packet processing unit APm.

The audio data encoder MDB1 encodes the input audio signal DI1 'to form audio data AI1'. The audio data AI1 'is multiplexed / multiplexed.
The signal is output to the terminal-side audio signal input terminal of the separation control unit PP1.

The audio data encoder MDB2 encodes the input audio signal DI2 'to form audio data AI2'. The audio data AI2 'is multiplexed / multiplexed.
The signal is output to the terminal-side audio signal input terminal of the separation control unit PP2.

The audio data encoder MDB3 encodes the input audio signal DI3 'to form audio data AI3'. The audio data AI3 'is multiplexed /
The signal is output to the terminal-side audio signal input terminal of the separation control unit PP3.

The audio level judging section LV outputs the transmission audio signals DO1, DO2, DO3 and the reception audio signal DI.
1, DI2, and DI3, which have the highest level, and a speaker terminal signal SV representing the result of the determination is output to video data processing means (described later).

FIG. 29 shows an example of the video data processing means in this case.

In the figure, the video packet processing unit VPm
Terminal TS1 output from the line-side output port of
The transmission video data VII1 to VII3 from ＴＳTS3 and the reception video data VIE1 to VIE3 output from the multiplexing / demultiplexing control units PP1 to PP3 are added to the selection circuit SS, respectively.

The selection circuit SS selects transmission video data VII1 to VII3 or reception video data VIE1 to VIE3 corresponding to the terminal indicated by the speaker terminal signal SV output from the audio data processing means. The obtained video data VSEL is stored in slave terminals TS1 to TS
3 are output to the video packet processing unit VPm as output video data VO1 to VO3 to be output to the multiplexing / demultiplexing control unit PP1 to PP3. Is output to

Thus, the slave terminals TS1 to TS3
In addition, a voice signal mixed with a voice signal transmitted from a terminal other than the own terminal is transmitted to a plurality of partner terminals, and a video signal transmitted from a terminal which is a speaker terminal at that time is transmitted. Therefore, the slave terminal TS1
A video conference communication session can be performed between the communication terminal TS3 and a plurality of partner terminals.

In this embodiment, data transmission between a plurality of slave terminals and a plurality of partner terminals has been described. However, one slave terminal and a plurality of partner terminals, or
Data transmission between a plurality of slave terminals and one partner terminal can be similarly realized.

By the way, in each of the embodiments described above, the case where the number of slave terminals is 3 has been described. However, the present invention can be similarly applied to a case where more slave terminals are provided.

[0203] Although wireless transmission such as a wireless LAN is applied as data communication between the master terminal and the slave terminal, wired transmission may be applied.

[0204]

As described above, according to the present invention,
A single multimedia communication system is composed of a plurality of slave terminals having a terminal function and a master terminal having a transmission function, so that a plurality of lines and a plurality of terminals can be used efficiently and system operability is improved. The effect is obtained.

Further, since the data transmission between the slave terminal and the master terminal is performed by wireless transmission, the degree of freedom in arranging the slave terminals is high, and the effect of greatly improving the usability of the system is obtained.

Also, since the slave terminal that is performing communication can be switched to another slave terminal as appropriate, there is obtained an effect that the line efficiency is good and the usability of the system is greatly improved.

Also, since one-to-many or many-to-many communication can be performed, the effect of greatly improving the usability of the system is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a multimedia communication system according to one embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a call packet.

FIG. 3 is a schematic diagram showing an example of a capability packet.

FIG. 4 is a schematic diagram showing an example of an incoming packet.

FIG. 5 is a schematic diagram showing an example of a response packet.

FIG. 6 is a schematic diagram showing an example of a disconnection packet.

FIG. 7 is a schematic diagram showing an example of a transfer packet.

FIG. 8 is a schematic diagram showing an example of a transfer notification packet.

FIG. 9 is a schematic diagram showing an example of a transfer response packet.

FIG. 10 is a schematic diagram showing an example of a voice packet.

FIG. 11 is a schematic diagram showing an example of a video packet.

FIG. 12 is a block diagram showing an example of a configuration of a master terminal.

FIG. 13 is a block diagram showing an example of a configuration of a slave terminal.

FIG. 14 is a flowchart showing a processing example of a master terminal for exchanging control packets.

FIG. 15 is a flowchart showing an example of an incoming call process (process 103).

FIG. 16 is a flowchart showing an example of a calling packet process (process 108).

FIG. 17 is a flowchart illustrating an example of a response packet process (process 109).

FIG. 18 is a flowchart illustrating an example of a transfer packet process (process 110).

FIG. 19 is a flowchart illustrating an example of a transfer response packet process (process 111).

FIG. 20 is a flowchart showing a processing example of a slave terminal TS for exchanging control packets.

FIG. 21 is a flowchart illustrating an example of a calling packet transmission process (process 204).

FIG. 22 is a flowchart illustrating an example of a capability packet process (process 208).

FIG. 23 is a flowchart showing an example of an incoming packet process (process 209).

FIG. 24 is a flowchart showing an example of a transfer notification packet process (process 210).

FIG. 25 is a flowchart illustrating an example of a transfer request packet transmission process (process 211).

FIG. 26 shows a master terminal T according to another embodiment of the present invention.
FIG. 2 is a block diagram showing an example of the configuration of M.

FIG. 27 shows a slave terminal T according to another embodiment of the present invention.
FIG. 2 is a block diagram showing an example of the configuration of S.

FIG. 28 is a block diagram showing a configuration example of audio data processing means of a master terminal TM according to still another embodiment of the present invention.

FIG. 29 is a block diagram showing a configuration example of video data processing means of a master terminal TM according to still another embodiment of the present invention.

[Explanation of symbols]

 TM master terminal TS, TS1-TS3 slave terminal

Claims (6)

[Claims] 1. A master terminal device connected to a public network and performing multiplexed multimedia communication with a partner terminal via the public network, and a multimedia terminal function, wherein the master terminal device wirelessly communicates with the master device. A plurality of slave terminal devices for exchanging media data, wherein the master terminal device communicates with a partner terminal connected via a public network based on identification information assigned to each of the plurality of slave terminal devices. While identifying the plurality of slave terminal devices that exchange data and performing one-to-one multimedia communication between the slave terminal device and the partner terminal, the master terminal device performs the multimedia communication and , Wherein a plurality of multimedia data exchanges with the slave terminal device are executed in parallel. Media communication system. 2. The exchange of multimedia data between the master terminal device and the slave terminal device is performed by a packet communication function using packet data classified for each media data. The multimedia communication system according to claim 1. 3. The multimedia communication system according to claim 2, wherein priorities are set for each of the types of packet data classified by the media data. 4. When the master terminal device requests a transfer in a state where a transfer destination slave terminal device is specified by the slave terminal device performing multimedia communication, the slave terminal device performs multimedia communication at that time. 3. The multimedia communication system according to claim 1, wherein the communication is switched to multimedia communication between the called terminal and the designated transfer destination slave terminal device. 5. A master terminal device connected to a public network and performing multiplexed multimedia communication with a partner terminal via the public network, and a multimedia terminal function, wherein the master terminal device wirelessly communicates with the master device. A plurality of slave terminal devices for exchanging media data, wherein the master terminal device communicates with a partner terminal connected via a public network based on identification information assigned to each of the plurality of slave terminal devices. A multimedia communication system comprising: identifying a plurality of slave terminal devices that exchange data; and performing one-to-many multimedia communication between the slave terminal devices and the partner terminal. 6. A master terminal device connected to a public network and performing multiplexed multimedia communication with a counterpart terminal via the public network, and a multimedia terminal function, wherein the master terminal device wirelessly communicates with the master device. A plurality of slave terminal devices for exchanging media data, wherein the master terminal device communicates with a partner terminal connected via a public network based on identification information assigned to each of the plurality of slave terminal devices. A multimedia communication system comprising: identifying a plurality of slave terminal devices that exchange data; and performing many-to-many multimedia communication between the slave terminal devices and the partner terminal.