JPH06311183A - Data multiplexer and data connection mode selection method - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable selection of circuit switching mode and packet switching mode of a data multiplexer in which a plurality of terminals with unknown traffic characteristics are concentrated on an ISDN network. [Composition] A communication density calculation means for calculating the communication density from the communication time for each call and the amount of data communication during the call, a table for storing the past communication density for each partner terminal, and a table for referring to this table when setting a new call. A mode selection means is provided for selecting the circuit switching mode when the storage communication density is equal to or higher than the reference value and selecting the packet switching mode when the storage communication density is less than the reference value. Further, when the current connection is in the packet switching mode and the added communication density exceeds the set value, switching mode setting 1 means for newly setting a channel in the circuit switching mode, a logical channel in the packet switching mode and a new channel. The switch 1 means for transferring the correspondence information 1 corresponding to the logical channel in the circuit switching mode, the switching mode setting 2 means for the opposite, and the switching 2 means are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data multiplexer and a data connection mode selecting method for constructing a data communication network by using an ISDN network which services both a packet switching mode and a circuit switching mode. .

[0002]

2. Description of the Related Art FIG. 7 shows a conventional service integrated digital network (hereinafter referred to as ISD) disclosed in Japanese Patent Laid-Open No. 3-45053.
It is a configuration example of a data terminal device using an N network). In the figure, 50 is a line I / F circuit, 51 is a line switching control circuit, 52 is a packet switching control circuit, and 53 is an end-to-end synchronization and speed matching control circuit. 54 is a central control circuit, 55 is a communication data storage memory, 5
6 is a communication data amount calculation means, and 57 is a service determination means. Reference numerals 58 and 59 are a display of a display system and its drive circuit, 60 and 61 are a keyboard and a key input interface of an input system, and 62 is a data interface.

Next, the operation will be described. When the user of the data terminal communicates, the communication means is requested by the input means such as the keyboard 60, the communication quantity is calculated by the data quantity calculation means 56 in accordance with the communication request, and the calculated value of the data quantity is calculated. To the service judging means 57, and the service judging means 57, which has a lower communication charge in the case of performing communication in the packet switching mode and the communication charge in the case of performing communication in the circuit switching mode, based on the price information registered in advance. The communication mode is determined and the communication in the determined communication mode is realized via the circuit switching control circuit 51 or the packet switching control circuit 52.

[0004]

In the conventional data terminal equipment using the ISDN network, when the user of the data terminal makes a communication request, the characteristics of the communication can be recognized in advance by the terminal, so that the data communication amount. Can be calculated and stored. However, when a terminal that generates communication data, such as a data multiplexer, is connected to the local side and the communication characteristics at the local terminal are unknown, the data multiplexer cannot calculate the communication data amount, ISDN
There is a problem that it is not possible to judge whether the packet switching mode of the network is appropriate or the circuit switching mode is appropriate. Furthermore, once the communication mode is decided and communication is started, even if the communication volume changes significantly, the original communication mode There was a problem that could not be changed.

The present invention has been made to solve the above problems, and enables an economical communication mode to be selected in an ISDN network even if the communication characteristics of the local terminal are unknown. The purpose.

[0006]

A data multiplexing apparatus according to the present invention comprises a communication density calculating means for calculating a communication density from a communication time for each call and a data communication amount during the call, and a past communication density for each partner terminal. And a table for storing new calls, refer to this table to select the circuit switching mode of the ISDN network when the storage communication density is above the reference value, and to select ISDN when the storage communication density is below the reference value. A mode selecting means for selecting a packet switching mode of the network is provided. According to another aspect of the present invention, there is provided a data multiplexing device for calculating a communication density from a communication time for each call and a data communication amount between the calls, and a communication density calculating unit for calculating a communication density for each call during simultaneous data transmission connected to the same multiplexing device. When the connection between the density adding means that calculates the added communication density by adding the data communication amount and the currently set terminal is in the packet switching mode, and the added communication density exceeds the set value, a new circuit switching is performed. Switching mode setting 1 means for connecting the channels of the mode and setting the logical channel of the required communication amount on the circuit switching mode, and the logical channel of the packet switching mode currently set in the partner data multiplexer. Between the currently set terminal and the switching 1 means for transferring the correspondence information 1 to the logical channel in the circuit switching mode set in When the connection is a circuit-switched mode,
When the added communication density becomes less than the set value, the switching mode setting 2 means for newly connecting the channel in the packet switching mode and setting the logical channel of the required communication amount on the packet switching mode, and the partner data multiplexer. There is provided switching 2 means for transferring the correspondence information 2 between the currently set logical channel in the circuit switching mode and the newly set logical channel in the packet switching mode, and for switching the switching mode.

Further, in the data connection mode selecting method according to claim 3, a communication density calculating step of calculating a communication density from a communication time for each call and a data communication amount during the call, and a step of storing a past communication density for each partner terminal. And a density addition step of calculating the added communication density by adding the data communication amount per time of each call during simultaneous data transmission connected to the same multiplexing device, and a mode selection for selecting a packet switching mode when a new call is set. Refer to the step and the stored communication density. If it is less than the set value, start communication in the selected packet switching mode. If this communication density is more than the set value, set the circuit switching mode and start communication. When the connection between the currently set terminal and the transmission step is set to the packet switching mode and the added communication density exceeds the set value, a new line is added. A switching mode setting step for connecting channels in the switching mode and setting a logical channel having a required communication amount on the circuit switching mode, and a logical channel in the packet switching mode currently set in the partner data multiplexer. Transfers the correspondence information 1 corresponding to the logical channel in the circuit switching mode set in 1. and switching 1 step for switching the switching mode, and the addition when the currently set connection between terminals is in the circuit switching mode. When the communication density becomes less than the set value, a circuit switching mode setting 2 step for newly connecting a channel in the packet switching mode and setting a logical channel having a necessary communication amount on the packet switching mode,
A switching 2 step for transferring the correspondence information 2 between the logical channel in the circuit switching mode currently set in the partner data multiplexer and the logical channel in the newly set packet switching mode, and switching the switching mode. It was

[0008]

According to the data multiplexer of the present invention, when a terminal belonging to the data multiplexer sets a call to another terminal, the past communication density is referred to,
Either packet switched mode or circuit switched mode is selected. Further, in the data multiplexer of claim 2, the communication density is regularly calculated even during communication from the terminal belonging to the data multiplexer to another terminal, and depending on the value, the communication density is changed to the packet switching mode from the middle. Communication is performed by switching to the circuit switching mode. According to the data connection mode selecting method of claim 3, when a terminal belonging to the data multiplexing device sets a call to another terminal, the past communication density is referred to, the packet switching mode is first selected, and then the terminal switching mode is selected. The communication density is periodically calculated, and depending on the value, the communication density is switched to the packet switching mode or the circuit switching mode and communication is performed.

[0009]

EXAMPLES Example 1. FIG. 1 is a configuration diagram of a network including a data multiplexing apparatus according to an embodiment of the present invention. In the figure, 1 is a data multiplexer according to the present invention, 2 is I
It is an SDN network, and 3A, 3B, 3C and 3D are local side terminals connected to the data multiplexer 1. 4 is IS
Data multiplexer of other party connected to DN network, 5A, 5
B is a partner terminal connected to the ISDN network, and 5C and 5D are partner terminals connected to the partner data multiplexer 4. In the data multiplexer 1, 10 is an ISDN line control unit for connecting to an ISDN network, 11 is a local line control unit for connecting one or more local side terminals, 12
Is a call control unit for controlling disconnection of call setup. Reference numeral 13 is a channel communication amount measuring unit for measuring the communication amount for each logical channel, and 14 is a channel communication time measuring unit for measuring the communication time of each logical channel (communication density calculation by both),
Reference numeral 15 is a communication density table that stores communication densities in past communication. Reference numeral 20 is a call setting control unit for finely controlling call setting / disconnection, and is a selecting means for selecting which exchange mode. Reference numeral 21 is a circuit switching mode control unit for controlling disconnection of circuit switching mode communication of the ISDN network, and 22 is ISD.
It is a packet switching mode control unit that controls the setting disconnection of the packet switching mode communication of the N network. A channel correspondence information transmission / reception control unit 23 controls transmission / reception of correspondence information between the logical channel in the packet switching mode communication and the logical channel in the circuit switching mode communication between the data multiplexers 1 or 4.

FIG. 2 shows a call control unit 12 of the data multiplexer 1.
It is a figure which shows the example of the communication density table 15 installed in it. In the figure, 30 is an area for registering a local terminal number connected to the own data multiplexer 1, 31 is a remote terminal number of a destination via the ISDN network which is a communication partner, and 32 is a remote terminal. A sub-number on the remote side when connected to the data multiplexer 4, and 33 is a past communication density between the terminals.

Next, the operation will be described. As shown in Figure 1,
The case where the terminal 3A and the terminal 5A, the terminal 3B and the terminal 5B, the terminal 3C and the terminal 5C, and the terminal 3D and the terminal 5D communicate with each other will be described. Now, when communication is performed in the packet switching mode of the ISDN network, as shown in FIG.
A D channel or one B channel is set between the SDN networks 2. The terminals 5A and 5B and the data multiplexer 4 also set a D channel or one B channel between the ISDN networks 2. Then, a logical channel corresponding to communication between terminals is set on the packet switching mode communication channel to realize communication. Further, when the communication is performed in the circuit switched mode of the ISDN network, as shown in FIG. 4, since there is only one communication for each opposite side between the terminals 3A and 3B and the terminals 5A and 5B via the ISDN network 2, there is only one communication. One B channel is set up with the ISDN network. Also, terminals 3C and 3D
B between the ISDN network 2 and the terminals 5C and 5D
Set the channel. Then, a logical channel corresponding to communication between terminals is set on each B channel to realize communication.

The communication between a specific terminal and a specific terminal often has the same traffic characteristics every time, and the channel communication amount measuring unit 13 determines whether the communication is in the packet switching mode or in the circuit switching mode. The amount of communication data for each call is measured by communication between terminals. When disconnecting the call and ending the communication, the channel communication amount measuring unit 13
Notifies the call setting control unit 20 of the total data transfer amount, and the channel communication time measuring unit 14 causes the call connection control unit 20 to
The communication time from the communication start time to the communication end time is notified to. The call setting control unit 20 calculates the communication density in communication by this call from the notified data transfer amount and communication time. Then, the communication density 33 is communicated with the calculated value together with the local terminal address 30 of the local terminals 3A, 3B, 3C, 3D etc. connected to the own data multiplexing apparatus 1 and the remote terminal address 31 of 5A, 5B, 5C, 5D etc. Register in the density table 15. If the remote side terminal is connected to a data multiplexer or the like and has a sub number, the sub number is registered in the remote side sub number 32 area. If the communication density of the communication in which the local terminal number and the remote terminal number match is already registered, the measured value of this time or the average value of the measured value and the registered value of this time is registered in the area of the communication density 33 in the same column. The communication density history is stored by calculating and updating new communication density such as. When the column for registering the communication density of the new communication disappears in the communication density table 15, the oldest registration field of the registered values is deleted so that the latest communication information is registered.

When setting a new call, the call control unit 12 of the data multiplexer 1 receives the call setting control unit 20 and the call setting request information from the local terminals 3A, 3B, 3C, 3D is locally received. The communication density table 15 is referenced using the side terminal number and the partner terminal number as indexes. Thus, the past communication density between the corresponding terminals is known, and it is determined based on the communication density whether the packet switching mode communication of the ISDN network is economical or the circuit switching mode is economical. When the packet switching mode is selected, the packet switching mode control unit 22 is instructed, and the packet switching mode control unit 22 establishes communication in the packet switching mode of the ISDN network with the destination terminal via the ISDN line control unit 10. To do. Similarly, when the circuit switching mode is selected, the circuit switching mode control unit 21 is instructed, and the circuit switching mode control unit 21 causes the ISDN line control unit 1 to operate.
The communication in the circuit switched mode of the ISDN network is established with the destination terminal via 0. When setting up a new call,
If communication in the circuit switching mode exists between the own data multiplexing device 1 and the partner terminals 5A, 5B or the partner data multiplexing device 4 via the ISDN network 2, the circuit switching mode communication that has already been set. Establish communication by adding a new logical channel on top. Further, when there is communication in the packet switching mode, the communication mode to be used is determined by judging whether the packet switching mode is economical or the circuit switching mode is economical based on the sum of the communication densities of the respective logical channels.

Example 2. An example applied in the first embodiment when there is no record of past communication density will be described. For example, in FIG. 1, the local side terminals 3C and 3D and the remote side terminal 5
It is assumed that C and 5D are communicating using the two logical channels in the packet switching mode via the partner data multiplexer 4. In this embodiment, at this time, the channel communication amount measuring unit 13 calculates the communication data amount per unit time (for example, 10 seconds) for each logical channel. That is, a value such as the total number of transfer bytes, the total number of transfer packets, or the number of packet transfers for each X byte is measured as the communication data amount, and the measured value is notified to the call setting control unit 20. In this embodiment, the call setting control unit 20 also calculates the communication density, and calculates the total amount of data communication per unit time of each call communicating with the same data multiplexer via the ISDN network 2. . Then, when it is determined that the circuit switching mode is more economical than the currently used packet switching mode, the switching mode setting means is also used to perform the following. That is, the circuit switching mode control unit 21 is instructed to use the empty B channel with the corresponding partner terminal and set the same number of logical channels as the logical channels used in the packet switching mode to the circuit switching mode. Set, and communicate in circuit switching mode for a certain period of time.

After that, as shown in FIG. 5, the channel correspondence information transmission / reception control unit 23 (mode switching means) operates in the circuit switching mode newly set from the local data multiplexer 1 to the remote data multiplexer 4. A command identifier 42 indicating that it is channel correspondence information using a specific logical channel 41, logical channels 43A and 43B in the already used packet switching mode communication, and a circuit switching mode corresponding to the logical channel. The channel correspondence information 40 indicating the pair of newly set logical channel numbers 44C and 44D is transmitted on the communication. After that, the data transfer using the packet switching mode communication from the local data multiplexer 1 to the remote data multiplexer 4 is stopped. The partner data multiplexer 4 receives the channel correspondence information 40, and prepares to switch the communication in the packet switching mode to the communication in the circuit switching mode according to the notified logical channel correspondence. That is, the data transfer using the packet switching mode communication is stopped, and the channel correspondence information 4 is transmitted from the partner side data multiplexer 4 to the own side data multiplexer 1.
A channel correspondence information response 45 indicating a response of only 0 and the command identifier 46 is transmitted. Further, when the circuit switching mode communication is newly established, the communication is started using the logical channels 44C and 44D notified in the circuit switching mode.
In the local side data multiplexer 1, the channel correspondence information response 4
5, the communication in the newly set circuit switching mode is started, the logical channel in the packet switching mode is disconnected, and the B channel in the ISDN network that is no longer used is released.

Even when the local side terminals 3C, 3D and the remote side terminals 5C, 5D are communicating in the circuit switching mode using two logical channels, the channel communication amount measuring unit 13 makes a unit for each logical channel. Measure the amount of communication data for each hour. Then, the call setting control unit 20 is notified, and the total amount of data communication per unit time of each call is calculated here. Therefore, when it is determined that the packet switching mode is more economical than the currently used circuit switching mode, the switching mode setting means is instructed to the packet switching mode control unit 22 to communicate with the corresponding partner terminal. Empty B
Set up communication in packet-switched mode using channel or D channel. At this time, the same number of logical channels as the logical channels used in the circuit switching mode are set in the packet switching mode. After that, the channel correspondence information transmission / reception control unit (mode switching means), similar to the switching from the packet switching mode to the circuit switching mode, carries out the channel correspondence information between the own side data multiplexer 1 and the partner side data multiplexer 4. 40 and the channel correspondence information response 44 associate the logical channel numbers in the circuit switching mode and the packet switching mode, and then the communication between the terminals is switched to the packet switching mode and the B channel used in the circuit switching mode. To release.

Embodiment 3. The data multiplexer is the first embodiment.
Even if it is not configured by function-specific elements such as 2, but is configured by a processor (hereinafter, the processor of the call control unit has all the functions) and an execution program, the same applies. The purpose can be achieved. FIG. 6 is a flow chart showing a data connection mode selection method corresponding to claim 3, which is an example constituted by such processing steps. In the figure, step S1 is a communication density calculation step for calculating the communication density from the communication time for each call and the amount of data communication during the call, step S2 is a step of storing the past communication density for each partner terminal, and S3 is It is a density addition step of calculating the added communication density by adding the above-mentioned data communication amount per time of each call during simultaneous data transmission connected to the same multiplexer. Step S4 is a mode selection step of selecting a packet switching mode at the time of setting a new call, and S5 refers to the stored communication density to start communication in the selected packet switching mode if less than the set value. If the memory communication density is equal to or higher than the set value, the circuit switching mode is set to start communication.

In step S6, when the connection currently set between the terminals is in the packet switching mode and the added communication density becomes equal to or higher than the set value, a channel in the circuit switching mode is newly connected and the required communication volume is increased. Of the logical mode of the packet switching mode currently set in the partner data multiplexer and the newly set circuit switching mode. This is a switching 1 step of transferring the correspondence information 1 with the logical channel and further switching the switching mode. In step S8, when the connection between the terminals currently set is in the circuit switching mode and the added communication density becomes less than the set value, a channel in the packet switching mode is newly connected and a logical channel having a required communication volume is connected. Is set in the packet switching mode. In step 2 of setting the circuit switching mode, S9 is a logical channel in the circuit switching mode currently set in the partner data multiplexer and a newly set logical channel in the packet switching mode. This is a switching 2 step in which the correspondence information 2 is transferred and the switching mode is switched.

This operation is as follows. For example, when a call is set up from the local side terminal 3C to the remote side terminal 5C connected to the partner side data multiplexing apparatus 4 via the ISDN network 2, the call setting request information is accepted by the call control unit 12 of the data multiplexing apparatus. In step S4, the processor establishes the packet switching mode communication with the destination terminal via the ISDN line control unit 10 in the packet switching mode using the D channel or the B channel of the ISDN network.
After that, in step S5a, the past communication density in communication between the corresponding terminals is known by referring to the communication density table 15 with the local terminal number and the partner terminal number. Based on the communication density, it is determined whether the packet switched mode communication of the ISDN network is economical or the circuit switched mode is economical. When the packet switched mode is selected, the communication in the already connected packet switched mode is started.

If the line switching mode is selected, the ISDN line control unit 1 is set as the line switching mode in step S5b.
The communication in the circuit switched mode of the ISDN network is started with the destination terminal via 0, and the communication is realized in the circuit switched mode for a fixed time. Also, when a call is additionally set as a new call from the local terminal 3D to the remote terminal 5D connected to the partner data multiplexer 4 via the ISDN network 2,
First, after setting the communication in the packet switching mode in S4,
When communication in the circuit switching mode exists between the own data multiplexing device and the partner data multiplexing device 4 via the ISDN network 2, a new logical channel is added to the already set circuit switching mode communication. Establish communication by adding. If only the communication in the packet switching mode is present, in step S6a, it is determined whether the packet switching mode is economical or the circuit switching mode is economical based on the sum of the communication densities of the respective logical channels, and the communication mode to be used is determined.

When the local side terminals 3C and 3D and the partner side terminals 5C and 5D are communicating in the packet switching mode using two logical channels, in step S1 each logical channel is set for each unit time. The amount of communication data is measured, and the total amount of data communication per unit time of each call is calculated in step S3. Therefore, if it is determined in S6a that the circuit switching mode is more economical than the currently used packet switching mode, the circuit switching mode is set in step S6b, and an empty B channel is used with the corresponding terminal. Set circuit switched mode communication. At this time, the same number of logical channels as the logical channels used in the packet switching mode are set on the circuit switching mode communication, and communication is performed in the circuit switching mode for a certain period of time. After that, in step S7, the correspondence information of the logical channel numbers in the circuit switching mode and the packet switching mode in the channel correspondence information 40 and the channel correspondence information response 44 between the own side data multiplexer and the partner side data multiplexer 4. After sending, the communication between the terminals is switched to the circuit switching mode and the communication in the packet switching mode is stopped. In this case, the logical channel may be held without being released.

Local side terminals 3C and 3D and partner side terminal 5
If C and 5D are communicating in circuit-switched mode using two logical channels, the processor also proceeds to step S.
In 1 ′, the communication data amount per unit time is measured for each logical channel, and in step S3 ′, the total data communication amount per unit time of each call is calculated. Therefore, in S8a, when it is determined that the packet switching mode is more economical than the currently used circuit switching mode, in step S9, the self-side data multiplexing device and the partner-side data multiplexing device 4 are connected. After transmitting the correspondence information of the logical channel numbers in the circuit switching mode and the packet switching mode in the channel correspondence information 40 and the channel correspondence information response 44, the communication is switched to the packet switching mode in which the communication between the terminals is suspended, and the circuit switching mode is set. Release the B channel used in.

Example 4. In each of the above embodiments, an example of a data multiplexing apparatus in which a plurality of data terminals whose traffic volume is unknown is connected is shown. However, a computer terminal which stores a plurality of processes whose traffic generation is unknown uses an ISDN network. The same function can be realized in the communication control function of the computer terminal when performing communication.

[0024]

As described above, according to the present invention, since the actual communication history storage means or the actual communication density measuring means, the selecting means, the exchange mode setting means and the switching means are provided, they are connected in advance. Even in a communication in which it is difficult to grasp the communication amount of a terminal or the communication density changes, there is an effect that an appropriate packet switching mode and circuit switching mode connection can be selected or switched.

[Brief description of drawings]

FIG. 1 is a network configuration diagram using a data multiplexing apparatus according to the present invention.

FIG. 2 is a diagram showing an example of a communication density table.

FIG. 3 is a diagram showing an example of communication using a packet switching mode.

FIG. 4 is a diagram showing an example of communication using a circuit switching mode.

FIG. 5 is a diagram showing a format example of channel correspondence information.

FIG. 6 is an operation flowchart of the third embodiment.

FIG. 7 is a block diagram of a conventional data terminal device.

[Explanation of symbols]

1 Data Multiplexing Device 2 ISDN Network 3, 3A, 3B, 3C, 3D Data Terminal 4 Data Multiplexing Device 5, 5A, 5B, 5C, 5D Data Terminal 13 Channel Communication Volume Measuring Unit 14 Channel Communication Time Measuring Unit 15 Communication Density Table 20 Call setting control unit (selecting unit, switching mode setting unit) 23 Channel correspondence information transmitting / receiving unit (Mode switching unit) 30 Local terminal number 31 Remote terminal number 32 Remote side sub number 33 Past communication density 40 Channel correspondence information Format 41 Logical channel for channel correspondence information 42 Command identifier indicating that it is channel correspondence information 43 Logical channel number in packet switching mode 44 Logical channel number in circuit switching mode 45 Channel correspondence information format 46 Command identifier

[Procedure amendment]

[Submission date] August 25, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Further, in the data connection mode selecting method according to claim 3, a communication density calculating step of calculating a communication density from a communication time for each call and a data communication amount during the call, and a step of storing a past communication density for each partner terminal. And a density addition step of calculating the added communication density by adding the data communication amount per time of each call during simultaneous data transmission connected to the same multiplexing device, and a new call setting regardless of the communication density.
The mode selection step of selecting the packet switching mode in advance and the stored communication density are referred to. If the communication density is less than the set value, communication is started in the selected packet switching mode. When the transmission step that sets the switching mode and starts communication, and the connection currently set between the terminals is in the packet switching mode and the added communication density exceeds the set value, a new channel in the circuit switching mode is set. A switching mode setting step for connecting and setting a logical channel for the required communication volume on the circuit switching mode, a logical channel for the packet switching mode currently set in the partner data multiplexer, and a newly set line Transfer the correspondence information 1 with the logical channel in the exchange mode,
In addition, if the connection 1 between the switching mode and the currently set connection between the terminals is in the circuit switching mode and the added communication density becomes less than the set value, it is set in advance.
In order to return to the communication in the packet switching mode, the correspondence information 2 between the logical channel in the circuit switching mode currently set in the partner data multiplexer and the logical channel in the newly set packet switching mode is transferred. However, the switching two steps for switching the exchange mode are provided.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

According to the data multiplexer of the present invention, when a terminal belonging to the data multiplexer sets a call to another terminal, the past communication density is referred to,
Either packet switched mode or circuit switched mode is selected. Further, in the data multiplexer of claim 2, the communication density is regularly calculated even during communication from the terminal belonging to the data multiplexer to another terminal, and depending on the value, the communication density is changed to the packet switching mode from the middle. Communication is performed by switching to the circuit switching mode. Further, in the data connection mode selection method according to claim 3, when a terminal belonging to the data multiplexer sets a call to another terminal, the past communication density is referred to, and first, the communication in the packet switching mode is set, That
The circuit switching mode was selected depending on the communication density between the rear terminals.
In case of packet-switching mode communication, send data without disconnecting
Communication is performed in the hold state where reception is stopped.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Embodiment 3. Packet switching in ISDN networks
In mode communication, pay-as-you-go billing, and circuit-switched mode
Many networks use the pay-as-you-go system for communication.
In the case of, in the circuit switching mode, from call setup to call disconnection
The fee will be charged depending on the time until
In the mode, the data sent and received regardless of the call connection time.
The fee is collected only based on the amount of data. Such an ISDN network
An example suitable for is shown. FIG. 6 is a flow chart showing a data connection mode selection method corresponding to claim 3, which is an example constituted by such processing steps. In the figure, step S1 is a communication density calculating step for calculating the communication density for each call from the communication time and the amount of data communication during the call.
2 is a step of storing the past communication density for each partner terminal, and S3 is the addition communication density calculated by adding the data communication amount per time of each call during simultaneous data transmission connected to the same multiplexer. This is a density addition step. In step S4, when setting a new call, first of all, in advance,
In the step of setting the packet exchange mode communication, S5 is
If the stored communication density is less than the set value by referring to the stored communication density, communication is started in the selected packet switching mode, and if the stored communication density is more than the set value, the circuit switching mode is set and communication is started. It is a step.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

In step S6, when the connection currently set between the terminals is in the packet switching mode and the added communication density becomes equal to or higher than the set value, a channel in the circuit switching mode is newly connected and the required communication volume is increased. Of the logical mode of the packet switching mode currently set in the partner data multiplexer and the newly set circuit switching mode. This is a switching 1 step of transferring the correspondence information 1 with the logical channel and further switching the switching mode. Step 8 is currently set in the partner data multiplexer
Circuit switched mode logical channels and preset
To the logical channel on the packet switching mode
Transfer information 2 and switch the switching mode.
Up 2. Step 9 is switched and unused
This is a step of disconnecting the circuit switched mode communication.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

When the local side terminals 3C and 3D and the partner side terminals 5C and 5D are communicating in the packet switching mode using two logical channels, in step S1 each logical channel is set for each unit time. The amount of communication data is measured, and the total amount of data communication per unit time of each call is calculated in step S3. Therefore, if it is determined in S6a that the circuit switching mode is more economical than the currently used packet switching mode, the circuit switching mode is set in step S6b, and an empty B channel is used with the corresponding terminal. Set circuit switched mode communication. At this time, the same number of logical channels as the logical channels used in the packet switching mode are set on the circuit switching mode communication, and communication is performed in the circuit switching mode for a certain period of time. After that, in step S7, the correspondence information of the logical channel numbers in the circuit switching mode and the packet switching mode in the channel correspondence information 40 and the channel correspondence information response 44 between the own side data multiplexer and the partner side data multiplexer 4. , The communication between terminals is switched to the circuit switching mode, and the packet switching mode is
Data transmission and reception on the
Hold it without letting go.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Local side terminals 3C and 3D and partner side terminal 5
If C and 5D are communicating in circuit-switched mode using two logical channels, the processor also proceeds to step S.
In 1 ′, the communication data amount per unit time is measured for each logical channel, and in step S3 ′, the total data communication amount per unit time of each call is calculated. Therefore, when it is determined in S8a that the packet switching mode is more economical than the currently used circuit switching mode, in step S8b , the data switching device between the own side data multiplexing device and the other side data multiplexing device 4 After sending out the correspondence information of the logical channel numbers in the circuit switching mode and the packet switching mode in the channel correspondence information 40 and the channel correspondence information response 44, the mode is switched to the packet switching mode in which the communication between the terminals is suspended, and in step 9 Release the B channel used in the circuit switching mode.

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (3)

[Claims] 1. A communication density calculation means for calculating a communication density from a communication time for each call and a data communication amount during the call, a table for storing the past communication density for each partner terminal, and the table for setting a new call. If the storage communication density is equal to or higher than the reference value, select the circuit switching mode of the integrated service digital network (hereinafter referred to as ISDN network),
If the storage communication density is less than the reference value, a mode selecting means for selecting a packet switching mode of the ISDN network is provided.
A data multiplexer that collects terminals and connects them to the ISDN network. 2. A communication density calculating means for calculating a communication density from a communication time for each call and a data communication amount during the call, and the data communication amount per time of each call during simultaneous data transmission connected to the same multiplexer. When the connection between the density adding means for adding to calculate the added communication density and the currently set terminal is in the packet switching mode, and the added communication density becomes equal to or more than the set value, a channel in the circuit switching mode is newly added. Switching mode setting means for connecting a logical channel having a required communication amount on the circuit switching mode, and a logical channel in the packet switching mode currently set in the partner data multiplexer and the newly added The connection between the currently set terminal and the switching 1 means for transferring the correspondence information 1 corresponding to the set logical channel on the circuit switching mode and switching the mode is performed. When the addition communication density is less than the set value in the switching mode, a switching mode setting means for newly connecting a channel in the packet switching mode and setting a logical channel having a required communication amount on the packet switching mode. And a switching 2 means for transferring the correspondence information 2 between the logical channel in the currently set circuit switching mode and the newly set logical channel in the packet switching mode to the partner data multiplexer and switching the mode. A data multiplexer for collecting terminals and connecting them to an ISDN network. 3. A communication density calculating step of calculating a communication density from a communication time for each call and a data communication amount during the call, a step of storing the past communication density for each partner terminal, and a simultaneous connection to the same multiplexer. The density addition step of calculating the added communication density by adding the data communication amount per time of each call during data transmission, and the mode selection step of selecting the packet switching mode when setting a new call Referring to the communication density, if it is less than the set value, the communication is started in the selected packet switching mode, and if the communication density is more than the set value, the circuit switching mode is set and the communication is started. When the connection between the set terminals is in the packet switching mode and the added communication density exceeds the set value, a new channel in the circuit switching mode is opened. Switching mode setting step for setting a logical channel having a required communication volume on the circuit switching mode, and a logical channel in the packet switching mode currently set in the partner data multiplexer and the new setting Information 1 corresponding to the logical channel on the established circuit switching mode is transferred, and the switching 1 step for switching the switching mode and the added communication density when the currently set connection between terminals is in the circuit switching mode. Is less than the set value, the circuit switching mode setting 2 step of newly connecting the channel in the packet switching mode and setting the logical channel of the required communication volume on the packet switching mode, and Correspondence between the set logical channel in circuit switching mode and the newly set logical channel in packet switching mode 2 was transferred, the data connection mode selecting method in the data multiplexing apparatus connected to the ISDN network collects terminal and a switching two steps of switching the exchange mode.