JP3496802B2 - Call connection method - Google Patents

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 A TTC (The Telecommunication Technology C) is provided as a standard for a service that bundles a plurality of ISDN B channels and provides high-speed communication through a public network.
ommittee; Telegraph and Telephone Technical Committee) Standard JS-13871
Etc., there are conventional video conference systems, LAN (Loc
al Area Network, PBX (Private Branch Exc)
hange) etc.

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

(2) In the originating communication device, based on the communication mode received from the terminating communication device and the number of channels that can be bundled, the communication mode performed in the subsequent communication and the B channel channel bundled in the terminating communication device. The number and the like are determined, and these pieces of information are transmitted to the receiving side communication device (c). (3) In the communication device on the receiving side, the communication mode to be executed which is determined and transmitted by the communication device on the transmitting side and the number of channels to be bundled by the communication device on the receiving side (to be exact, there is one channel connected first). The number of B channels to be bundled minus one channel-1) is received, and the telephone number of the own device for the number of channels is returned (d).

(4) The communication device on the calling side receives from the communication device on the called side (the number of B channels to be bundled-1).
Individual telephone numbers are sequentially called at fixed time intervals, and (the determined number of channels-1) B channels are connected (e to
p). As a result, all of the B channels that are bundled together with one B channel that is initially connected are connected.

(5) A control frame including a synchronization character, a frame number, a channel number, a group number to be bundled, etc. is sent from each B channel at the same time using a line connected to both the transmitting side communication device and the receiving side communication device. (Q). Here, the synchronization character is a fixed pattern that is located at the beginning of the control frame and indicates the start position of the control frame for normally receiving the information in the control frame. The frame number is the serial number of the control frame and is between the B channels. Of the received data, the channel number is used to divide the transmission data into a plurality of B channels and send the data, and the channel number is the order of division of the transmission data and the received data of each B channel. The group number is used for matching the order of conversion and is given to each channel, and the group number is for confirming the line transmitted by the communication device on the receiving side that requested the connection.

(6) Each B channel of the receiving side communication device detects a synchronization character, establishes synchronization of the control frame, receives a frame number, and detects the B channel with the slowest data arrival based on the received frame number. , The received data arrival time difference (ΔTi) between the slowest B channel and another B channel (i) is calculated, and the received data of the B channel (i) is delayed by a time of ΔTi by a memory element etc. The delay compensation is performed so that the B-channel arrives at the same time, and the synchronization between channels is established in the communication device on the transmission side by transmitting the control frame in which the synchronization establishment completion flag between the channels is turned on to the communication device on the transmission side. Notify that you have done (q).

(7) Upon receiving the notification of establishment of synchronization between the channels, the communication device on the transmitting side stops the transmission of the control frame of each B channel which was transmitted in (5) above, and instead uses the high speed input data as a channel. The B channels are sequentially divided into numbered B channels, and each B channel transmits the divided input data (q). (8) In the communication device on the receiving side, when the synchronization is established in (6) above, the output data of the B channels in the order in which the channel numbers are given are sequentially multiplexed while maintaining the delay compensation state, and the original high speed is obtained. It is returned to data and is output (r).
By the above operation, even if the input data at a high speed is divided into a plurality of B channels with different propagation delay times and transmitted, the reception side communication device performs delay compensation and multiplexing of each B channel, thereby performing high speed communication. Is possible.

[0009]

However, when the above-mentioned conventional call connection method is used to bundle a plurality of ISDN B channels and perform high-speed data communication via a public network or the like, the following problems occur. is there. That is, the above (4)
In, the calling side communication device needs to call the telephone number of each B channel received from the receiving side communication device and connect the B channels for (the determined number of channels-1). At this time, It is not possible to call multiple numbers simultaneously on one device, and the intervals must be constant. Therefore, the connection time increases as the number of B channels to be bundled increases.

If the telephone number calling interval can be made very small and the number of calls per unit time can be made very large (for example, 100 times / second), the increase in connection time is not a serious problem, but the unit It becomes a problem when the number of calls per hour cannot be increased. For example, in the case of communication via an exchange, a call interval of 3 calls in 2 seconds is usually required due to the limit of the processing capacity of the exchange, and 24 B channels are bundled to perform high-speed communication (1.536 Mbps). In this case, if it goes through the exchange, it becomes (24-1) / 2/3 seconds, that is, about 15 seconds, which requires a long connection time. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a call connection method in bulk transfer that connects a required B channel in a short time and reduces the call control load of an exchange.

[0011]

The call connection method of the present invention comprises:
In order to achieve the above object, the telephone number of the calling side communication device is transferred from the calling side communication device to the called side communication device for the number of B channels requested to connect to the called side communication device, and the called side communication device performs communication. By connecting the telephone numbers of the receiving side communication device for the number of remaining B channels to the device and connecting the call from both the calling side communication device and the receiving side communication device, the B channel connection required in a short time Is to do.

More specifically, in a call connection method in the case of bundling a plurality of lines for transmitting a signal of a predetermined communication speed and dividing a signal having a communication speed of a plurality of times into the plurality of lines for communication. , The calling side communication device (A) calls an arbitrary telephone number of the called side communication device (B) to connect one line, and the number of bundled lines necessary for communication from now on using the line is set to the called side. The first step of notifying the communication device (B) (a in FIG. 2) and the second step of the receiving communication device (B) returning the number of lines that can be bundled by itself to the transmitting communication device (A). In step (b), the originating communication device (A) determines the number of lines that can be bundled, and this information and the number of lines requested to be called to the receiving communication device (B) and the telephone numbers of these lines are used by the receiving side. The third step (the same c) of transferring to the communication device (B), and the receiving side communication device (B But, from now on the originating communication device (A)
The fourth step (same as d) of returning the telephone number of the communication device on the receiving side of the line to be called by the communication device (A) on the transmitting side, and the communication device on the transmitting side (A) and the communication device on the receiving side (B) It is characterized in that it has a fifth step (the same e to j, e'to k ') of sequentially calling at a fixed time interval using the telephone number received from the side communication device and connecting the line.

In the third step (same as c), the group number for identifying the line to be further bundled is transferred to the receiving side communication device (B), and the fifth step (same as e). j, e ′ to k ′), the fixed time interval is designated by the communication device (A) on the originating side or fixedly set in the communication device in advance. The fixed time interval is 3 calls / 2 It is characterized by being seconds.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The call connection method of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an example of a block configuration 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 caller side and the callee side.
Is a negotiation control of multi-bundle communication mode such as control of the whole device, operation control, line outgoing / incoming line control, etc. (including outgoing call control to called side communication device), determination of the number of channels that can be bundled, etc. A main control unit 11 having functions and the like, and a line interface unit 12 connected to a line and having a line termination, a channel sending / receiving function, and a disconnecting function are provided.

Further, the communication device 10 for realizing the call connection method of the present invention has a function of establishing synchronization / delay between channels, bundling the channels and transmitting the data as high speed data to a terminal side interface which will be described later. Connected to a channel multi-bundle / divider 13 having a function of dividing the high-speed data from the device and transmitting the data to each channel on the line side, and a terminal (not shown) such as a video conference system that requires high-speed communication. , A terminal side interface unit 14 having a function of terminating the terminal and transmitting / receiving data to / from the terminal, a ROM for storing control software
A (read only memory) 15 and a RAM (random access memory) 16 for executing a program are provided.

FIG. 2 is a sequence diagram for explaining the call connection method of the present invention. The call connection method of the present invention will be described below with reference to the sequence diagram of FIG. In this embodiment,
High-speed communication by bundling 24 B channels (1.536 Mbps
The operation sequence will be described using an example of the case of performing s) and making three calls with a call interval of 2 seconds. The calling interval may be a value determined by the network environment specified by the originating communication device (A) and notified to the terminating communication device (B). However, when a normal exchange is used, as in this example. The call interval of “3 calls / 2 seconds” may be fixedly set in advance in the communication device.

(1) The calling communication device (A) calls an arbitrary telephone number of the receiving communication device (B), connects one B channel, and uses the connected B channel to perform high-speed communication. Exchange necessary information. First, the originating communication device (A) sends out a desired communication mode for performing communication from now on, the number of B channels that can be bundled, and the like (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 originating communication device (A) = the number of B channels that can be bundled by the receiving communication device (B) = 24.

(2) Based on the communication mode received from the communication device on the receiving side (B) and the number of channels that can be bundled, the communication device on the transmitting side (A) performs the communication mode and the communication device on the receiving side to be executed in the subsequent communication. The number of B channels to be bundled in (B) is determined, and this information, and the number of B channels requested to connect to the communication device (B) on the receiving side (the number of B channels to be bundled / 2) and the information The telephone number and the group number to be bundled are transferred to the called communication device (B) (c). The group number to be bundled here is a unique number given to the group to be bundled by the communication device on the calling side. This is the number transmitted by the communication device on the called side requested to connect, or a completely different device. It is provided to identify whether the call originates from the device, and is returned using the B channel connected only when the former call is made.

(3) The receiving side communication device (B) receives the information determined and transmitted by the transmitting side communication device (A), and the B channel channel transmitted by the transmitting side communication device (A). The number of telephone numbers of the called communication device (B) is returned for the number (to be precise, since there is one channel initially connected, the number of B channels to be bundled / 2-1) excluding the one channel is returned. (D). In this example, the number of B channels requested to be connected to the called communication device (B) = 12, and the number of B channels sent from the calling communication device (A) = 11.

(4) In this example, the originating communication device (A)
Calls the telephone number of the receiving side communication device (B) received from the receiving side communication device (B) (the number of B channels to be bundled / 2-1) at regular time intervals (2/3 seconds), B channels corresponding to (half of the determined number of channels-1) are connected (e to j). Further, the called side communication device (B) also receives the telephone numbers (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 regular time intervals. (2/3
Seconds) and connect half of the determined channels (e'-k ').

As described above, the originating communication device (A)
By connecting from both and the communication device (B) on the receiving side,
Connect all B channels that are bundled together with the B channel that was initially connected. After that, the same operations as (5) to (8) in the operation outline of the related art are 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 mainly performed by the main control unit 11.
The process (8) is executed by the multi-channel bundle / dividing unit 13.

When the call connection method of this embodiment is adopted, in communication between communication devices, data input at high speed to one communication device can be bundled into a plurality of B channels and communicated to other communication devices at high speed. It will be possible. More specifically, (1) Since call connection is made from both the originating communication device and the terminating communication device, the call connection time is about 1/2. (2) Call control generated from a single device is about half that of conventional
Therefore, the call control load on the exchange is reduced. (3) The method of making a call connection from both the calling side communication device and the called side communication device can be applied to any of the analog line, the ISDN basic interface, and the primary group speed interface. (4) The ratio of call connections from both the calling side communication device and the called side communication device can be set arbitrarily, and the communication cost burden ratio of the calling side communication device and the called side communication device can also be set arbitrarily. is there.

[0023]

As described above, according to the call connection method of the present invention, the B-channel call connection is made from both the calling side communication device and the called side communication device, which is required in a short time. B channels can be connected, and the call control load on the exchange can be reduced.

[Brief description of drawings]

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

FIG. 2 is a sequence diagram for explaining a call connection method of the present invention.

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

[Explanation of symbols]

10: Communication device 11: Main control unit 12: Line interface section 13: Channel bundle / splitting unit 14: Terminal side interface section 15: ROM 16: RAM

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-11-88457 (JP, A) JP-A-8-130587 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04Q 3/58 H04M 3/00 H04L 12/00 H04M 11/00

Claims (4)

(57) [Claims] 1. A call connection method in the case of bundling a plurality of lines for transmitting a signal of a predetermined communication speed and dividing a signal of the multiple communication speed into the plurality of lines to perform communication A first step of making a call to an arbitrary telephone number of the called communication device in the device, connecting one line, and notifying the called communication device of the number of bundled lines required for future communication using the line; The second step of returning the number of lines that the receiving side communication device can bundle to the transmitting side communication device, and the number of lines that the transmitting side communication device bundles, and requesting this information and the receiving side communication device to make a call. The third step of transferring the number of lines and the telephone numbers of those lines to the communication device on the receiving side, and the communication device telephone number of the communication device on the receiving side of the line on which the communication device on the receiving side makes a call in the communication device on the receiving side. And the fifth step of connecting to the line by making a call to each of the calling side communication device and the called side communication device at regular time intervals using the telephone number received from the partner communication device. 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 receiving side communication device. 3. The call according to claim 1, wherein the fixed time interval in the fifth step is designated by the communication device on the calling side or fixedly set in advance in the communication device. How to connect. 4. The call connection method according to claim 1, wherein the predetermined time interval is 3 calls / 2 seconds.