JPH08139720A - Fast communication method and device therefor - Google Patents

Abstract

PURPOSE: To set an optimum number of circuits and to attain the effective transfer of information by observing the synchronizing codes that are sent in absence of the transmission data or observing the input/output data on a buffer and then detecting the quantity of data to be transmitted. CONSTITUTION: When the circuits 1 to (n) are set, a flag detection part 16 monitors the signals which are sent from an HDLC(high-level data link control) part 13 in a communication mode and counts up a counter 17 every time an HDLC flag that is sent in the absence of the transmission data is detected. A circuit number deciding part 19 fetches the count value (f) of the counter 17 at every unit time informed from a timer 18 and resets the counter 17. In this instance, the value (f) means the number of flags per unit time that are occupied in the circuit (n) under communication and also shows that the quantity of invalid data to be transmitted is equal to (f) bytes. Based on this invalid communication rate, the number of circuits to be added to the circuit (n) under communication is decided. Thus it is possible to always secure the number of circuits in response to the amount of information to be transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission capacity when a plurality of low speed lines are bundled to perform high speed data communication between terminal devices connected via a network such as ISDN (Integrated Digital Communication Network). The present invention relates to a high-speed communication method and device for increasing / decreasing the number of lines in accordance with the above.

[0002]

2. Description of the Related Art In ISDN, a plurality of B channels (64 kbps) are bundled to communicate high-speed data, but a line to be used is fixedly assigned from the start to the end of communication.
That is, even if the amount of information fluctuates during communication, the number of lines (data transmission capacity) has not been increased or decreased accordingly.

[0003]

In order to allocate an appropriate number of lines corresponding to the amount of information during communication, it is necessary to successively monitor the amount of information and detect the corresponding number of lines. The present invention, in a system for performing high-speed communication by bundling a plurality of low-speed lines, automatically detects the number of lines commensurate with the amount of information to be transmitted, and sets the optimum number of lines commensurate with the amount of information successively while continuing communication. An object of the present invention is to provide a communication method and device.

[0004]

According to a first aspect of the present invention, there is provided a high-speed communication method for performing communication by bundling a plurality of low-speed lines by adopting a method of continuously transmitting transmission data or a synchronization code. Is detected and the number is counted every unit time, and the invalid communication rate indicating the ratio of non-transmitted data is obtained from the number of synchronization codes obtained in step 1, and the number of lines corresponding to this invalid communication rate is calculated. It comprises a step 2 of determining and a step 3 of changing the number of lines in communication to the number of lines obtained in the step 2.

According to a second aspect of the present invention, in a high speed communication method for temporarily storing transmission data in a buffer and bundling a plurality of low speed lines for communication, the amount of transmission data input to the buffer per unit time and The step 1 of measuring the amount of data stored in the buffer, and the buffer usage rate for the capacity of the buffer is calculated from the amount of data stored in the buffer obtained in step 1, and the buffer usage rate and the amount of transmission data input to the buffer are determined. It comprises a step 2 of determining the number of lines and a step 3 of changing the number of lines in communication to the number of lines obtained in the step 2.

According to a third aspect of the present invention, in a high-speed communication device that employs a method of continuously transmitting transmission data or a synchronization code, and a plurality of low-speed lines are bundled for communication, the synchronization code is detected and a unit time is detected. The sync code counting means for counting the number for each of them, and the invalid communication rate indicating the ratio of the non-transmission data is obtained from the sync code number obtained by the sync code counting means, and the number of lines corresponding to the invalid communication rate is determined. A line number determining unit and a line number changing unit that changes the number of lines in communication with the line number obtained by the line number determining unit are provided.

According to a fourth aspect of the present invention, in a high-speed communication device having a buffer for temporarily storing transmission data and performing communication by bundling a plurality of low-speed lines, the amount of transmission data input to the buffer and accumulation of the buffer Measuring means for measuring the amount of data and the buffer usage rate for the capacity of the buffer from the amount of data accumulated in the buffer obtained by the measuring means,
A line number determining means for determining the number of lines according to the buffer usage rate and the amount of transmission data input to the buffer, and a line number changing for changing the number of lines in communication to the number of lines obtained by the line number determining means And means.

[0008]

According to the high-speed communication method of the first aspect and the high-speed communication device of the third aspect, the effective transmission data amount is detected by measuring the ratio (invalid communication ratio) of the synchronization code transmitted when there is no transmission data. can do. If the invalid communication rate exceeds a predetermined value, the number of lines in communication is reduced or the lines are disconnected. On the other hand, if the invalid communication rate falls below a predetermined value, the number of lines is increased. As a result, it is possible to secure the optimum number of lines (transmission capacity) commensurate with the amount of transmission data while continuing communication.

According to the second aspect of the high-speed communication method and the fourth aspect of the high-speed communication apparatus, the number of lines (transmission capacity) with respect to the current transmission data amount is measured by measuring the buffer usage rate and the transmission data amount input to the buffer. Can be detected. The number of lines is increased when the buffer usage rate exceeds a predetermined value. On the other hand, if the buffer usage rate becomes less than or equal to a predetermined value, the number of lines in communication is reduced. In addition, the buffer usage rate is 0
And the transmission data amount input to the buffer is not present, the line is disconnected. As a result, it is possible to secure the optimum number of lines (transmission capacity) commensurate with the amount of transmission data while continuing communication.

[0010]

【Example】

(First Embodiment) FIG. 1 shows the structure of a first embodiment of a high-speed communication apparatus according to the present invention. The present embodiment is applied to ISDN. In the figure, high-speed communication devices 10-1, 1
0-2 accommodates n independent ISDN lines, and is connected to each other via ISDN 30.

The high-speed communication device 10 includes an ISDN interface section 11 connected to an ISDN line, a multi-channel communication control section 12, an HDLC section 13 for performing high-level data link control, and a predetermined interface line (eg RS
It has a device interface control unit 14 connected to an external device via -232C, SCSI, X.21) and a main control unit 15.

[0012] Furthermore, as one related to the present invention, HD
A flag detection unit 16 that monitors a signal sent from the LC unit 13 to detect an HDLC flag (synchronization code);
A counter 17 that counts the flags detected by the flag detection unit 16, a timer 18 that notifies the time (unit time) to review the number of lines during communication, and a counter 1 for each unit time.
A line number determining unit 19 which calculates the number of lines according to the count value of 7 and gives the number to the multi-channel communication control unit 12 is provided. The timer 18 and the line number determining unit 19 are the main control unit 15
The counter 17 is reset by an instruction from the line number determining unit 19.

The HDLC flag will be described below. In HDLC, as shown in FIG. 2, a flag F having a predetermined bit pattern [01111110] is always transmitted to the line even when there is no transmission data, and a flag synchronization method is adopted to synchronize the transmission side and the reception side. There is. The receiving side uses the flag F
When an HDLC frame (ACI-FCS) other than the above is received, it is determined that the data has been sent. The bit pattern [011] other than the flag F is the same as that of the flag F.
In order to prevent 11110] from appearing, a method is adopted in which when the number of consecutive bits [1] is 5, the transmitting side forcibly inserts [0] at the 6th bit and the receiving side removes this.

In this embodiment, the flag of the HDLC sent when there is no data to be transmitted is detected, but it is used as the flag of the data link layer protocol LAPB of X.25 or the D channel protocol of ISDN. It may be configured to detect the flag of the LAPD that has been activated.
The operation of this embodiment will be described below with reference to the flowchart shown in FIG.

It is assumed that n lines (B channels) are currently set and a maximum transmission capacity of n × 8 (kilobytes / second) is secured. The flag detection unit 16 monitors the signal sent from the HDLC unit 13 during communication, and sends an HDLC flag (011111) when there is no transmission data.
The counter 17 is incremented each time 10) is detected.

The line number determining unit 19 counts the value f of the counter 17 for each unit time t (second) notified from the timer 18.
Is taken in and the counter 17 is reset. Here, the count value f of the counter 17 is the number of flags per unit time t occupied in the currently communicating n lines, and indicates that the amount of invalid data transmitted is f bytes. Number of lines determination unit 19
Determines the invalid communication rate D (%) for the maximum transmission capacity of 8000 nt per unit time t as D = (f / 8000 nt) × 100. Furthermore, based on this invalid communication rate D (%), for example, according to the calculation method of the number of communication lines increase or decrease shown in Table 1,
Decide the increase / decrease number for the n lines currently in communication.

[0017]

[Table 1]

That is, if the invalid communication rate D is less than 25%, the number of lines is increased because the amount of transmission data is large. If the invalid communication rate D is 25% or more and less than 75%, it is determined that the transmission capacity is appropriate for the current transmission data amount, and the number of lines is maintained. If the invalid communication rate D is 75% or more, the number of lines is reduced by one because the transmission data is small. However, it is the case of n ≧ 2, and the case where the number of lines becomes 0 due to the reduction of the number of lines is excluded. If the invalid communication rate D is 100%, there is no transmission data and the line is disconnected. The line number determination unit 19 notifies the multi-channel communication control unit 12 of the new line number thus determined. After that, the number of lines is repeatedly reviewed every unit time t until the end of communication.

The multi-channel communication control unit 12 is responsive to the number of lines given from the line number determining unit 19 during IS communication.
The number of lines is increased / decreased while interacting with the opposing high-speed communication device via the DN interface unit 11. An example of the procedure is shown below. The multi-channel communication control unit 12 of the high-speed communication device 10-1 uses the line number notified from the line number determination unit 19 to connect to the opposite high-speed communication device 10-2 via the line currently connected while continuing communication. Then, the line number change information including the line number information and the line number information (for example, telephone number) is transmitted. At this time, it is necessary to identify the transmission data and the line number change information, but they can be identified by the HDLC address defined between terminals in advance. The high-speed communication device 10-2 that has received the line number change information first confirms the line number information. Here, if the line number information indicates that the line is disconnected, all lines are connected. If the number of lines is to be reduced, the line indicated by the line number information is disconnected. In addition, if the current state is maintained, communication continues on the same line. Further, if the number of lines is increased, it is determined whether or not it is possible. The high speed communication device 10-2 responds as a response indicating whether or not the number of lines can be increased.
The line number change information including the information on the number of communicable lines is returned to the high-speed communication device 10-1. On the other hand, the high speed communication device 10-1 transmits a request for changing the number of lines (affirmative response) or a request for maintaining the current status (negative response) to the high speed communication device 10-2.
The high-speed communication devices 10-1 and 10-2 set the line notified by the line number information after transmitting / receiving the positive response.

(Second Embodiment) FIG. 4 shows the configuration of a second embodiment of the high-speed communication apparatus of the present invention. In this example, the IS
It is applied to DN. In the figure, high-speed communication devices 20-1 and 20-2 are n independent ISDNs, respectively.
It accommodates a line and is connected oppositely via an ISDN 30.

The high speed communication device 20 includes an ISDN interface section 21 connected to an ISDN line, a multi-channel communication control section 22, a buffer 23 for temporarily storing transmission data, and a predetermined interface line (eg RS-232C, SCS).
It has a device interface controller 24 connected to an external device via I, X.21) and a main controller 25. further,
A counter 26 that counts the amount of transmission data input to the buffer 23, and a buffer 23 that are related to the present invention.
Counter 27 for counting the amount of transmission data accumulated in
And a timer 28 for notifying the time (unit time) for reviewing the number of lines during communication, and counters 26, 2 for each unit time.
The number of lines is calculated according to the count value of 7 and given to the multi-channel communication control unit 22. The timer 28 and the line number determination unit 29 are connected to the main control unit 25.
The counter 26 is reset by the instruction of the line number determining unit 29.

The operation of this embodiment will be described below with reference to the flow chart shown in FIG. It is assumed that n lines (B channel) are currently set. The counter 26 counts up each time a unit data amount (m bytes) of transmission data is input to the buffer 23. The counter 27 stores a unit data amount (m bytes) in the buffer 23.
When the transmission data of (1) is input, it counts up, and when the transmission data of the unit data amount (m bytes) is output from the buffer 23, it counts down. The line number determination unit 29 fetches the count value g of the counter 26 and the count value h of the counter 27 and resets the counter 26 every unit time t (second) notified from the timer 28. Here, the transmission data amount input to the buffer 23 in the unit time t is gm, and the accumulated data amount in the buffer 23 measured every unit time t is hm. Number of lines determination unit 29
Is the buffer usage rate C with respect to the capacity M of the buffer 23.
(%) Is calculated as C = (hm / M) × 100. Further, based on C and g, for example, as shown in Table 2, the increase / decrease number for the currently communicating n line is determined.

[0023]

[Table 2]

That is, if the buffer usage rate C is 75% or more, the number of lines is increased by one because the transmission capacity is small with respect to the input transmission data amount. Buffer usage rate C is 25%
If it is less than 75%, the transmission capacity is judged to be appropriate for the amount of input transmission data and the number of lines is maintained. Buffer usage C is less than 25%, or C = 0 and g> 0
If so, the number of lines is reduced by one because the transmission capacity is large with respect to the input transmission data amount. However, it is the case of n ≧ 2, and the case where the number of lines becomes 0 due to the reduction of the number of lines is excluded. If C = 0 and g = 0, there is no transmission data and the line is disconnected. The line number determination unit 29 uses the new line number determined in this way as the multi-channel communication control unit 2.
Notify 2. After that, the number of lines is repeatedly reviewed every unit time t until the end of communication.

The multi-channel communication control unit 22 is responsive to the number of lines given from the line number determination unit 29 during IS communication.
The number of lines is increased / decreased while interacting with a high-speed communication device which is opposed via the DN interface unit 21. The procedure for increasing or decreasing the number of lines is the same as in the first embodiment. However, in order to identify the transmission data and the line number change information, it is necessary to preliminarily define between the terminals.

[0026]

As described above, according to the present invention, during high-speed communication performed by bundling a plurality of low-speed lines, the synchronization code sent when there is no transmission data or the input / output data amount of the buffer is observed and transmitted. Detect the amount of information. Further, the number of lines suitable for the amount of information is automatically detected, and the number of lines for communication is increased or decreased to set the optimum number of lines. As a result, the number of lines that is always commensurate with the amount of information to be transmitted is secured, so that efficient information transmission becomes possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of a high-speed communication device of the present invention.

FIG. 2 is a diagram illustrating a form of a flag synchronization method.

FIG. 3 is a flowchart illustrating the operation of the first embodiment.

FIG. 4 is a block diagram showing the configuration of a second embodiment of the high-speed communication device of the present invention.

FIG. 5 is a flowchart illustrating the operation of the second embodiment.

[Explanation of symbols]

 10, 20 High-speed communication device 11, 21 ISDN interface section 12, 22 Multi-channel communication control section 13 HDLC section 14, 24 Equipment interface control section 15, 25 Main control section 16 Flag detection section 17, 26, 27 Counter 18, 28 Timer 19, 29 Line number determination unit 23 Buffer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H04M 3/00 B H04Q 11/04 9371-5K H04L 13/00 303 Z 9566-5G H04Q 11/04 E

Claims (4)

[Claims] 1. A high-speed communication method, which employs a method of continuously transmitting transmission data or a synchronization code and performs communication by bundling a plurality of low-speed lines, detects the synchronization code, and counts the number every unit time. Step 1 of the above, Step 2 of determining an invalid communication rate indicating the ratio of non-transmitted data from the number of synchronization codes obtained in Step 1, and determining the number of lines according to this invalid communication rate; And a step 3 of changing the number to the number of lines obtained in the step 2. 2. A high-speed communication method in which transmission data is temporarily stored in a buffer and a plurality of low-speed lines are bundled for communication, and the amount of transmission data input to the buffer and the amount of data stored in the buffer are measured every unit time. Step 1, and a step of determining a buffer usage rate with respect to the capacity of the buffer from the amount of data stored in the buffer obtained in Step 1 and determining the number of lines according to the buffer usage rate and the amount of transmission data input to the buffer. 2. A high-speed communication method comprising: 2 and step 3 of changing the number of lines in communication to the number of lines obtained in step 2. 3. A high-speed communication device that employs a method of continuously transmitting transmission data or a synchronization code and performs communication by bundling a plurality of low-speed lines, detects the synchronization code, and counts the number every unit time. A synchronization code counting means, and a line number determining means for determining an invalid communication rate indicating a ratio of non-transmission data from the number of synchronization codes obtained by the synchronization code counting means, and determining the number of lines according to the invalid communication rate. A high-speed communication apparatus comprising: a line number changing unit for changing the number of lines in communication to the line number obtained by the line number determining unit. 4. A high-speed communication device having a buffer for temporarily storing transmission data and performing communication by bundling a plurality of low-speed lines, wherein the amount of transmission data input to the buffer and the amount of data accumulated in the buffer are measured. Number of lines for determining the number of lines according to the measuring unit and the buffer utilization ratio with respect to the capacity of the buffer from the accumulated data amount of the buffer obtained by the measuring unit, and the buffer utilization ratio and the transmission data amount input to the buffer A high-speed communication apparatus comprising: a determining unit and a line number changing unit that changes the number of lines in communication with the line number obtained by the line number determining unit.