JPH11113034A - Call connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a call connection method by which a required B channel is connected in a short time and a load for call control for an exchange is relieved. SOLUTION: A caller side communication equipment (A) decides the number of channels to be bundled, this information, the number of channels requesting a call to a callee side communication equipment (B) and telephone numbers of the channels (and a group number to identify a group of channels to be bundled) are transferred (a), the callee side communication equipment (B) returns a callee side communication equipment telephone number of a channel callee by the caller side communication equipment (A) (b), both the callee side communication equipment (A) and the callee side communication equipment (B) call sequentially a received telephone number of each channel at a prescribed time interval (e-j and e'-k') to connect all the channels. Then communication is conducted (q-r) after setting up synchronization by a control frame by using the connected channels. Through, the constitution above, both the caller and the callee make call connection to connect a required B channel in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call connection method between communication devices, and more particularly to a call connection method for performing high-speed communication by bundling a plurality of B channels between communication devices subscribed to ISDN. is there.

[0002]

2. Description of the Related Art TTC (The Telecommunication Technology CTS) is a service that provides a high-speed communication through a public network by bundling a plurality of ISDN B channels.
ommittee; Telegraph and Telephone Technical Committee) Standard JS-13871
There are video conferencing systems, LAN (Loc
al Area Network), PBX (Private Branch Exc)
hange).

FIG. 3 is a sequence diagram for explaining a conventional call connection method. Hereinafter, the conventional operation will be described with reference to FIG. (1) The calling communication device calls an arbitrary telephone number of the called communication device and connects one B channel. Using one connected B channel (in-band), information necessary for performing high-speed communication is exchanged. First, a communication mode desired for communication from now on, the number of B-channels to be bundled, and the like are transmitted from the originating communication device (a). The receiving-side communication device receives these communication modes and the number of B-channels to be bundled, and returns a communication mode in which the own device can communicate, the number of B-channels that can be bundled to the own device, and the like to the transmitting-side communication device (b) ).

[0004] (2) In the transmitting side communication device, based on the communication mode received from the receiving side communication device and the number of channels that can be bundled, the communication mode to be performed in the subsequent communication and the channel of the B channel bundled in the receiving side communication device. The number and the like are determined, and the information is transmitted to the receiving-side communication device (c). (3) In the called-side communication device, the communication mode determined and transmitted by the calling-side communication device and the number of channels to be bundled in the called-side communication device (exactly, since there is one channel connected first, , The number of B channels to be bundled minus 1) is received, and the telephone numbers of the own device corresponding to the number of channels are returned (d).

(4) The calling communication device receives from the called communication device (the number of B channels to be bundled-1)
Calls are sequentially made at regular time intervals, and the (determined number of channels-1) B channels are connected (e to e).
p). As a result, all the B channels that are bundled together with one B channel connected first are connected.

(5) A control frame including a synchronization character, a frame number, a channel number, a group number to be bundled, and the like is transmitted from each B channel at the same time by using a line connected to the transmitting side communication apparatus and the receiving side communication apparatus. (Q). Here, the synchronization character is located at the beginning of the control frame, is a fixed pattern indicating the start position of the control frame for normally receiving the information in the control frame, and the frame number is the serial number of the control frame. When the transmission data is divided into a plurality of B channels and sent, the channel number is used to calculate the reception data arrival time difference and the order in which the transmission data is divided, and the received data of each B channel is multiplexed. The group number is used to match the order of conversion, and is assigned to each channel, and the group number is used to confirm the line transmitted by the called communication device that requested connection.

(6) Each B channel of the receiving communication device detects a synchronization character, establishes synchronization of a control frame, receives a frame number, and detects a B channel that has the slowest data arrival based on the received frame number. Calculate the received data arrival time difference (△ Ti) between the slowest B channel and the other B channel (i), delay the received data of the B channel (i) by the time of △ Ti by a memory element, etc. The delay between the two channels is compensated for as if they arrived at the same time, and the control frame with the synchronization establishment completion flag between the channels turned on is transmitted to the originating communication device, thereby establishing synchronization between the channels at the originating communication device. Notification (q).

(7) Upon receiving the notification of the establishment of synchronization between the channels, the transmitting communication apparatus stops transmitting the control frame of each B channel transmitted in (5) above, and instead transmits the high-speed input data to the channel. The B channels are sequentially divided into the numbered B channels, and each B channel transmits the divided input data (q). (8) When the synchronization is established in the above (6), the receiving-side communication device multiplexes the output data of the B channels in the order in which the channel numbers are assigned while keeping the delay compensation state as it is, and returns to the original high speed. This is returned to the data and output (r).
By the above operation, even if data input at a high speed is divided into a plurality of B channels having different propagation delay times and transmitted, the receiving side communication device performs delay compensation and multiplexing of each B channel to achieve high speed communication. Is possible.

[0009]

However, when a plurality of ISDN B channels are bundled by the above-described conventional call connection method and high-speed data communication is performed via a public network or the like, the following problems arise. is there. That is, the above (4)
In, the calling communication device needs to call the telephone number of each B channel received from the called communication device and connect (determined number of channels -1) B channels. It is not possible to make a plurality of readings at the same time with one device, and the interval must be fixed. Therefore, as the number of B channels to be bundled increases, the connection time increases.

[0010] If the number of calls per unit time can be made very large (for example, 100 times / second) by making the interval between calls of telephone numbers very small, the increase in connection time will not be a problem. This is a problem if the number of calls per hour cannot be increased. For example, in the case of communication via an exchange, a calling interval of three calls in two seconds is usually required due to the limit of the processing capacity of the exchange, and high-speed communication (1.536 Mbps) is performed by bundling 24 B channels. In this case, when the signal passes through an exchange, the time is (24-1)） seconds, that is, about 15 seconds, and a long connection time is required. SUMMARY OF THE INVENTION It is an object of the present invention to provide a call connection method for bulk transfer that solves the above-mentioned problems and connects a necessary B channel in a short time, and reduces the load of call control of an exchange.

[0011]

According to the present invention, there is provided a call connection method comprising:
In order to achieve the above object, the telephone numbers of the calling communication devices corresponding to the number of the plurality of B channels requested to be connected from the calling communication device to the called communication device are transferred, and the calling communication is transmitted from the called communication device to the called communication device. The necessary number of B-channel connections can be established in a short time by transferring the telephone numbers of the receiving-side communication devices corresponding to the number of the remaining B-channels to the device and performing call connection from both the calling-side communication device and the receiving-side communication device. Is performed.

More specifically, in a call connection method in which a plurality of lines for transmitting a signal of a predetermined communication speed are bundled, and a signal of a multiple of the communication speed is divided into the plurality of lines for communication. The calling communication device (A) calls an arbitrary telephone number of the called communication device (B), connects one line, and uses the called line to determine the number of bundled lines required for communication from now on. A first step (a in FIG. 2) for notifying the communication device (B), and a second step in which the receiving communication device (B) returns the number of lines that can be bundled by the own device to the calling communication device (A). In step (b), the caller communication device (A) determines the number of lines that can be bundled, and sends this information, the number of lines to be called to the receiver communication device (B), and the telephone numbers of those lines on the receiver side. A third step (c) for transferring to the communication device (B); But, from now on the originating communication device (A)
The fourth step (d) of returning the telephone number of the called communication device of the line to which the call originates to the calling communication device (A), and communicating with the calling communication device (A) and the called communication device (B). A fifth step (e-j, e'-k ') for sequentially calling and connecting a line at predetermined time intervals using the telephone number received from the side communication device.

In the third step (c), a group number for identifying a line to be bundled is further transferred to the receiving side communication device (B), and in the fifth step (e to e). j, e 'to k') are designated by the originating communication device (A) or fixed in advance in the communication device, and the fixed time interval is 3 calls / 2 Seconds and so on.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a call connection method according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a block diagram of a communication device for realizing the call connection method of the present invention. As shown in the figure, a communication device 10 for realizing the call connection method of the present invention used on the calling side and the called side
Negotiation of multi-bundled communication mode, such as communication control functions such as control of the entire apparatus, operation control, transmission / reception control of a line (including a transmission control function to a destination communication apparatus), and determination of the number of channels that can be bundled A main control unit 11 having a function and the like, and a line interface unit 12 connected to a line and having a line termination, a channel transmission / reception function and a disconnection function are provided.

Further, the communication apparatus 10 for realizing the call connection method of the present invention has a function of establishing and delaying synchronization between channels, bundling channels and transmitting them as high-speed data to a terminal-side interface described later. Multi-channel bundle / division unit 13 having a function of dividing high-speed data from the network and transmitting the data to each channel on the line side, and a terminal (not shown) that requires high-speed communication such as a video conference system. A terminal interface unit 14 having a function of terminating the terminal and transmitting / receiving data to / from the terminal, a ROM for storing control software
(Read only memory) 15 and RAM (random access memory) 16 for program execution.

FIG. 2 is a sequence diagram for explaining the call connection method of the present invention. Hereinafter, the call connection method of the present invention will be described with reference to the sequence diagram of FIG. In this embodiment,
High-speed communication (1.536 Mbps) by bundling 24 B channels
The operation will be described in the order of operation using an example in which s) is performed, the calling interval is 2 seconds, and 3 calls are made. The calling interval may be specified by the calling side communication device (A) at a value determined by the network environment, and may be notified to the called side communication device (B). The calling interval of “3 calls / 2 seconds” may be fixedly set in the communication device in advance.

(1) The calling communication device (A) calls an arbitrary telephone number of the called communication device (B), connects one B channel, and performs high-speed communication using the connected B channel. Exchange of necessary information. First, a communication mode desired for communication from now on, the number of B channels that can be bundled, and the like are transmitted from the transmitting side communication device (A) (a). The receiving-side communication device (B) receives these communication modes and the number of B-channels that can be bundled, and determines the communication mode in which the own device can communicate, the number of B-channels that can be bundled by the own device, and the like. Return to A) (b). In this example, the number of B channels that can be bundled by the calling communication device (A) = the number of B channels that can be bundled by the receiving communication device (B) = 24.

(2) In the transmitting side communication device (A), based on the communication mode received from the receiving side communication device (B) and the number of channels that can be bundled, the communication mode and the receiving side communication device to be carried out in the subsequent communication. In (B), the number of B channels to be bundled is determined, and such information, the number of B channels to be requested to be connected to the receiving side communication device (B) (the number of B channels to be bundled / 2), and Is transferred to the receiving-side communication device (B) (c). Here, the group number to be bundled is a unique number given to the group to be bundled by the calling communication device, which is transmitted by the called communication device requested to be connected, or a completely different device. This is provided to identify whether the call originated from the other party, and is returned using the B channel connected only when the former call was made.

(3) The receiving-side communication device (B) receives the information determined and transmitted by the transmitting-side communication device (A), and transmits the B-channel transmitted by the transmitting-side communication device (A). The telephone numbers of the receiving-side communication devices (B) corresponding to the number (to be exact, since there is one channel connected first, excluding the one channel, the number of B-channels to be bundled / 2-1) are returned. (D). In this example, the number of B channels requested to connect to the receiving communication device (B) = 12 The number of B channels transmitted by the transmitting communication device (A) = 11.

(4) In the present embodiment, the transmitting side communication device (A)
Calls the telephone numbers of the receiving side communication devices (B) for the number of (B channels to be bundled / 2-1) received from the receiving side communication devices (B) at regular time intervals (間隔 seconds), The B channels of (half of the determined number of channels −1) channels are connected (e to j). Also, the receiving-side communication device (B) receives the telephone number of (the number of B-channels to be bundled / 2) received from the calling-side communication device (A) in the same manner as the calling-side communication device (A) at a certain time interval. (2/3
Second) and connect half of the determined channel (e'-k ').

As described above, the transmitting side communication device (A)
And the connection from both the called communication device (B)
A total number of B channels to be bundled together with the initially connected B channel are connected. Thereafter, the same operation as (5) to (8) in the operation outline of the conventional technique is performed. The processes (1) and (4) are mainly performed by the main control unit 11 and the line interface unit 12, and the processes (2) and (3) are performed by the main control unit 11 (5) to (5).
The processing of (8) is executed by the channel multi-bundle / division unit 13.

When the call connection method of this embodiment is adopted, in communication between communication devices, data input at a high speed to one communication device can be bundled into a plurality of B channels and communicated to another communication device at a high speed. Will be possible. More specifically, (1) the call connection time is reduced to about 発 信 because the call connection is performed from both the calling communication device and the called communication device. (2) Call control generated from one device is about 1/2 of the conventional one
Thus, the call control load on the exchange is reduced. (3) The method of making a call connection from both the originating communication device and the receiving communication device can be applied to any of an analog line, a basic interface of ISDN, and a primary rate interface. (4) The ratio of call connection from both the calling communication device and the called communication device can be set arbitrarily, and the share of the communication cost between the calling communication device and the called communication device can also be set arbitrarily. is there.

[0023]

As described above, according to the call connection method of the present invention, since the call connection of the B channel is performed from both the communication device on the calling side and the communication device on the receiving side, it is necessary to shorten the time. It is possible to connect various B channels and reduce the load of call control of the exchange.

[Brief description of the drawings]

FIG. 1 is an example of a block diagram of a communication device for realizing a call connection method of the present invention.

FIG. 2 is a sequence diagram illustrating a call connection method according to the present invention.

FIG. 3 is a sequence diagram for explaining a conventional call connection method.

[Description of Signs] 10: Communication device 11: Main control unit 12: Line interface unit 13: Multi-channel bundle / division unit 14: Terminal side interface unit 15: ROM 16: RAM

Claims (4)

[Claims] 1. A call connection method in which a plurality of lines for transmitting a signal of a predetermined communication speed are bundled and a signal having a multiple of the communication speed is divided into the plurality of lines for communication. A first step of calling an arbitrary telephone number of a called-side communication device in the device, connecting one line, and notifying the called-side communication device of the number of lines to be bundled for communication using the line; A second step of returning the number of lines that can be bundled by the own device in the called-side communication device to the calling-side communication device; determining the number of lines to be bundled in the calling-side communication device; and requesting this information and the called-side communication device to make a call. A third step of transferring the number of lines and the telephone numbers of those lines to the receiving communication device; and transmitting the receiving communication device telephone number of the line to be called by the calling communication device in the receiving communication device. A fourth step of transmitting a call to the calling communication apparatus and the called communication apparatus at regular time intervals using the telephone number received from the other communication apparatus, and connecting the line; A call connection method comprising: 2. The call connection method according to claim 1, wherein in the third step, a group number for identifying a line to be further bundled is transferred to a called communication device. 3. The call according to claim 1, wherein the fixed time interval in the fifth step is designated by a calling communication device or fixedly set in advance in the communication device. Connection method. 4. The call connection method according to claim 1, wherein the predetermined time interval is 3 calls / 2 seconds.