JP3689056B2 - COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, COMMUNICATION CONTROL APPARATUS, AND COMMUNICATION METHOD divided into connection setting stage and data communication stage - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication system, a communication apparatus, a communication control apparatus, and a communication method, which are divided into a connection setting stage and a data communication stage for judging the congestion of each of the plurality of communication apparatuses connected to each other via a communication line. About.
[0002]
[Prior art]
In a voice communication system having a plurality of communication devices (for example, switching devices), processing from when one call is generated until it is terminated can be divided into, for example, connection setting processing, voice call processing, and call disconnection processing. . The connection setting process includes a call setting process (new call generation) and a communication path establishment process. Here, when a large number of new calls occur, the load on the communication device is mainly a load in the connection setting process (that is, the stage from the call setting process to the communication path establishment process). There is little load.
[0003]
For this reason, as a load applied to the communication apparatus, the load of the connection setting process may be mainly considered. This load can be determined, for example, by measuring the number of new calls in the connection setting process. Further, the control method when the communication apparatus is congested can be dealt with by suppressing the process in the connection setting process.
[0004]
FIG. 10 is a diagram showing a configuration of a conventional communication system. The communication system includes a plurality of communication devices 61a to 61d connected to each other via a communication line, communication terminal devices 62a to 62d connected to each communication device via a line, and each communication device. And a communication control device 63 that performs control and the like.
[0005]
The communication control device (operation system unit) has a function of receiving notifications (messages) from the communication devices 61a to 61d or transmitting instructions (commands) to the communication devices 61a to 61d. The communication system includes an input / output device 64 that is connected to the communication control device 63, outputs a message received by the communication control device 63 to the worker, and sends a command from the worker to the communication control device.
[0006]
FIG. 11 is a flowchart showing a communication method in the communication system, and FIG. 12 is a conceptual diagram for explaining a coping method when congestion occurs in the communication device 61a.
[0007]
In the communication system configured as described above, when a call is made from the communication terminal device 62a to the communication terminal device 62c, a communication start device transmits a call start signal via the communication devices 61a and 61c, and receives the signal. 62c sends a call response signal to the communication terminal device 62a via the communication devices 61c and 61a (call setting process S500).
[0008]
Then, the communication terminal device 62a transmits a communication path establishment signal via the communication device 61a, and the communication terminal device 62c receiving the signal transmits a response signal to the communication terminal device 62a via the communication devices 61c and 61a. send. Thereby, a communication path is established among the communication terminal device 62a, the communication device 61a, the communication device 61c, and the communication terminal device 62c (communication route establishment processing S510).
[0009]
After the communication path is established, a voice call is performed between the communication terminal device 62a and the communication terminal device 62c. This is the voice call process (S520). When the call is finished, when a call disconnect signal is sent from the communication terminal device 62a to the communication terminal device 62c, the communication terminal device 62c sends a response signal to the communication terminal device 62a via the communication devices 61c and 61a ( Call disconnection process S530). This terminates the call.
[0010]
Next, a load measuring method for the communication device 61a and a control method when congestion occurs in the communication device 61a will be described.
[0011]
At the call setting processing stage, the communication device 61a measures the number of new calls and notifies the communication control device 63 (S540). The communication control device 63 determines the congestion state of the communication device 61a based on the notified number of new calls, and causes the input / output device 64 to output the determination result (S550). If the operator determines that congestion has occurred, the operator inputs a congestion control command to the communication device 61a from the input / output device 64 (S560), and the result is sent to the communication control device 63. The communication control device 63 sends a congestion control command to the communication device 61a (S570). The communication device 61a performs congestion control (control in call setting processing) based on the congestion control command.
[0012]
[Problems to be solved by the invention]
However, the above-described conventional technology has the following problems. In data communication such as image data and character data, for example, the process from the occurrence of one connection request (corresponding to a call) to the end is performed in the connection setting process stage, the data communication stage, and the disconnection process stage. Can be divided into stages.
[0013]
When a large amount of connection requests occur and a large amount of data (for example, communication of moving image data) is exchanged between communication devices, in addition to the processing load in the connection setting processing step, the data communication step It is also necessary to consider the processing load in
[0014]
However, when the above-described communication system for voice communication is applied to data communication such as image data, when the processing load of a certain communication device is greatly congested, the processing load at the connection setting processing stage It is impossible to determine whether the processing load is large or the processing load at the data communication stage is large, and appropriate measures for controlling the congestion cannot be performed.
[0015]
Therefore, when data communication is being performed, the processing load at the connection setting processing stage of the communication device and the processing load at the data communication step are determined separately, and when the communication device is in a congested state, an appropriate The development of a communication system that can take measures has been desired.
[0016]
The present invention has been made to solve the above problems, and when data communication is performed, the processing load in the connection setting processing stage of the communication device, the processing load in the data communication stage, Providing a communication system, a communication device, a communication control device, and a communication method divided into a connection setting stage and a data communication stage that can take appropriate measures when the communication device is in a congested state. Objective.
[0017]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a communication device that, when determining congestion of each communication device of a plurality of communication devices connected to each other via a communication line, During the connection setting performed before starting data communication, the number of connection signals to be transmitted / received is measured, and the communication device transmits / receives data during data communication with other communication devices. A predetermined number of connection signals and a predetermined amount of data communication determined in consideration of the processing capability of the communication device are stored in the storage means, and the measured number of connection signals and the predetermined number of connection signals And, based on the comparison result, determine the congestion at the connection setting stage in the communication device, compare the measured data communication amount with the predetermined data communication amount, and based on the comparison result, In the data communication stage of communication equipment It is characterized in that to determine the 輳.
[0018]
According to the present invention, unlike the prior art, it is not possible to determine only the processing load at the connection setting processing stage, and it is possible to determine the processing load at the connection setting processing stage and the data communication processing stage. . As a result, the operator can perform appropriate congestion control in a connection setting process stage and a data communication process stage.
[0019]
Further, the present invention generates a first congestion control command that is a command for controlling congestion at a connection setting stage for the communication device based on a determination result of congestion at a connection setting step in the communication device, and Based on the determination result of the congestion at the data communication stage in the device, a second congestion control command that is a command for controlling the congestion at the data communication step for the communication device is generated, and based on the first congestion control command, The congestion at the connection setting stage in the communication apparatus can be controlled, and the congestion at the data communication stage in the communication apparatus can be controlled based on the second congestion control command.
[0020]
According to the present invention, as in the prior art, even if the processing load of the communication device is large, only the congestion in the connection setting process can be controlled, and the congestion control in the connection setting process and the congestion control in the data communication process are possible. It becomes. Therefore, the congestion control of the communication device can be performed more effectively than in the prior art.
[0021]
  As the congestion control, when the first congestion control command is received, the number of connection signals transmitted and received by the communication device is reduced, and when the second congestion control command is received, the communication device It is preferable to reduce the amount of data communication to be transmitted / received.
  In addition, the present invention acquires a processing amount per unit time in a CPU included in the communication device, a predetermined processing amount determined in consideration of processing capacity per unit time in the CPU, and the acquired Compare the amount of processing, determine the congestion in the CPU based on the comparison result, and when the congestion in the CPU is determined, measure the number of connection signals, the amount of data communication, and the connection in the communication device It is also possible to determine congestion at the setting stage and congestion at the data communication stage.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(Configuration of communication system)
FIG. 1 is a diagram illustrating a configuration of a communication system (hereinafter simply referred to as a communication system) divided into a connection setting stage and a data communication stage according to the present embodiment. The communication system includes a plurality of communication devices 1a, 1b, 1c, 1d connected to each other via communication lines, and communication terminal devices 2a, 2b, 2c, 2d connected to each communication device via lines. A communication control device 3 that controls each communication device, and an input / output device 4 that sends information input by the operator to the communication control device 3 and outputs information sent from the communication control device 3 Have In this communication system, for example, a server device 3c having a large calculation function for data communication is connected to the communication device 1c in addition to the communication terminal device 2c.
[0023]
The communication terminal device 3 corresponds to, for example, a PC terminal device, a mobile terminal, a mobile phone, or the like. The communication terminal device 3 transmits and receives a connection setting start signal and transmits and receives a connection setting end signal.
[0024]
The communication terminal device 3 transmits / receives a data communication start signal, transmits / receives various data, and transmits / receives a data communication end signal. At this time, the data communication start signal, the data communication end signal, and the data signal include signal source position information and destination position information, respectively.
[0025]
(Communication device)
FIG. 2 is a diagram illustrating a configuration of the communication devices 1a to 1d. Specifically, the communication devices 1a to 1d correspond to an exchange device such as a gateway. Each of the communication devices 1a to 1d is connected to the communication control device 3 so that various signals can be transmitted and received, and the communication devices are also connected to each other via a communication line. It is possible to send and receive various signals while relaying.
[0026]
The communication devices 1 a to 1 d include a communication unit 11, a connection signal number measurement unit 12, a data communication amount measurement unit 13, and a congestion control unit 14. The communication unit 11 transmits and receives various signals and data to and from other communication devices and connected communication terminal devices.
[0027]
The communication unit 11 of the communication devices 1a to 1d receives a connection setting start signal, a connection setting end signal, and a data signal transmitted from another communication device or a connected communication terminal device. Then, the communication unit 11 sends a connection setting start signal and a connection setting end signal among the received signals to the connection signal number measurement unit 12, and sends a data signal to the data communication amount measurement unit 13. Further, the communication unit 11 of the communication devices 1a to 1d transmits a connection setting start signal and a connection setting end signal to be transmitted before transmitting to other communication devices and connected communication terminal devices. The data signal to be transmitted is sent to the data communication amount measuring unit 13. When the measurement operation by the connection signal number measurement unit 12 and the data communication amount measurement unit 13 is completed for the signal scheduled to be transmitted, the communication unit 11 reads each signal from each measurement unit 12 and 13, and the destination device Send each signal to.
[0028]
The operation in which the communication unit 11 sends the data signal to the data communication amount measurement unit 13 is performed as follows. The communication unit 11 acquires transmission source position information and destination position information included in the data communication start signal. The position information is, for example, a telephone number or address information. The communication unit 11 receives the position information of the transmission source position information and the data signal including the position information of the destination position information, or the position information of the transmission source position information and the position information of the destination position information. When the data signal to be included is scheduled to be transmitted, the data signal is sent to the data communication amount measuring unit 13. And the communication part 11 continues sending a data signal to the data communication amount measurement part 13 until the data communication end signal containing the positional information mentioned above is received.
[0029]
The connection signal number measuring unit 12 measures the number of connection setting start signals and connection setting end signals that are transmitted and received before starting data communication with the connected communication terminal device and other communication devices. Specifically, the connection signal number measuring unit 12 counts the number of connection setting start signals and the number of connection setting end signals sent from the communication unit 11 (hereinafter referred to as the connection setting start signal). The total of the number and the number of connection setting end signals is called the number of connection signals). The connection setting start signal and the connection setting end signal are collectively referred to as a connection signal. Then, the connection signal number measuring unit 12 gives identification information of the communication device to the measured number of connection signals and sends it to the communication unit 11.
[0030]
The data communication amount measurement unit 13 measures the amount of data communication to be transmitted / received during data communication with a connected communication terminal device or another communication device. Specifically, the data communication amount measurement unit 13 measures the data communication amount based on the data signal transmitted from the communication unit 11 every predetermined unit time. The data communication amount measuring unit 13 can measure the data communication amount in units of, for example, the number of packets and the number of bits. Then, the data communication amount measuring unit 13 gives identification information of the communication device to the measured data communication amount and sends it to the communication unit 11.
[0031]
The congestion control unit 14 controls congestion at the connection setting stage of the communication devices 1 a to 1 d based on the first congestion control command transmitted from the communication control device 3, and the second congestion transmitted from the communication control device 3. Based on the control command, the communication unit 11 is controlled so as to control congestion in the data communication stage of the communication devices 1a to 1d.
[0032]
Specifically, the congestion control unit 14 controls the communication unit 11 to decrease the number of times of transmission / reception of the connection setting start signal based on the first congestion control command. For example, the congestion control unit 14 controls the communication unit 11 to receive one of the two signals for the connection setting start signal transmitted. Further, for example, it is also possible to receive two signals for the connection setting start signal transmitted, and transmit only one signal. The connection setting end signal can be similarly controlled.
[0033]
Further, the congestion control unit 14 controls the communication unit 11 to reduce the amount of data communication to be transmitted / received based on the second congestion control command. Specifically, the congestion control unit 14 controls the communication unit 11 to receive, for example, one of the two signals for the data communication start signal transmitted. Thereby, the quantity of the data signal transmitted / received to the communication apparatuses 1a-1d can be reduced.
[0034]
(Communication control device 3)
FIG. 3 is a diagram illustrating a configuration of the communication control device 3. The communication control device 3 includes a communication device side reception unit 31, a first storage unit 32, a first congestion determination unit 33, a second congestion determination unit 34, and an input / output device side transmission unit 35.
[0035]
The communication device side receiving unit 31 receives the number of connection signals and the data communication amount transmitted from each of the communication devices 1a to 1d. The first storage unit 32 stores a predetermined number of connection signals and a predetermined amount of data communication determined in consideration of the processing capabilities of the communication devices 1a to 1d. Here, as an example, information specifying the number of connection signals and a predetermined number X of connection signals are associated with each other, and information specifying a data communication amount and a predetermined data communication amount Y are associated with each other. A correspondence table is stored in the first storage unit 32. An example of the correspondence table is shown in FIG. In the present embodiment, it is assumed that the processing capabilities of the communication apparatuses 1a to 1d are approximately the same.
[0036]
For example, the predetermined number of connection signals and the predetermined data communication amount can be determined as follows. The maximum processing capacity (maximum work amount that can be processed per unit time) for the communication apparatus to be able to operate for the guarantee time is measured in advance. The unit time is the same time as the unit time in the measurement operation by the connection signal number measurement unit 12 and the measurement operation by the data communication amount measurement unit 13.
[0037]
Then, based on the maximum processing capability, a connection setting processing capability for connection signal transmission / reception processing and a data communication processing capability for data signal transmission / reception processing are determined. In this case, it is determined in consideration of other processes of the communication devices 1a to 1d. The ratio of the data communication processing capacity to the connection setting processing capacity is determined, for example, in the design of the communication system.
[0038]
Then, a predetermined number of connection signals is determined based on the determined connection setting processing capability, and a predetermined data communication amount is determined based on the determined data communication processing capability.
[0039]
The first congestion determination unit 33 compares the number of connection signals measured by the connection signal number measurement unit 12 with a predetermined number of connection signals in the correspondence table, and based on the comparison result, the connection setting of the communication devices 1a to 1d. Determine congestion in processing. Specifically, for example, if the measured number of connection signals is larger, the first congestion determination unit 33 determines that the processing load in the connection setting process of the communication device is large, and congestion in the connection setting process occurs. If the measured number of connection signals is smaller, it is determined that the processing load in the connection setting process of the communication apparatus is not large and that congestion in the connection setting process has not occurred.
[0040]
The second congestion determination unit 34 compares the data communication amount measured by the data communication amount measurement unit 13 with a predetermined contact data communication amount in the correspondence table, and based on the comparison result, the data of the communication devices 1a to 1d. Determine congestion in communication processing. Specifically, for example, when the measured data communication amount is larger, the second congestion determination unit 34 determines that the processing load in the data communication processing of the communication device is large, and congestion in the data communication processing occurs. If the measured data communication amount is smaller, it is determined that the processing load in the data communication processing of the communication device is not large and that congestion in the data communication processing has not occurred.
[0041]
Then, the first congestion determination unit 33 sends the determination result to the input / output device 4 in association with the identification information of the communication devices 1a to 1d. Similarly, the second congestion determination unit 34 sends the determination result to the input / output device 4 in association with the identification information of the communication device.
In addition, the communication control device 3 includes an input / output device side reception unit 36, a second storage unit 37, a congestion control command generation unit 38, and a communication device side transmission unit 39.
[0042]
The input / output device side receiving unit 36 receives the congestion control effect in the connection setting process and the congestion control effect in the data communication process input by the operator.
[0043]
The second storage unit 37 stores information indicating the congestion control method in the connection setting process and information indicating the congestion control method in the data communication process. Specifically, as an example, as a congestion control method in connection setting processing, for a connection setting start signal, a congestion control method for controlling to receive one signal out of two signals, connection setting transmitted For the start signal, there is a congestion control method in which two signals are received and only one of them is transmitted.
[0044]
Further, as a congestion control method in data communication processing, for example, there is a congestion control method for controlling a received data communication start signal to receive one signal out of two signals.
[0045]
The congestion control command generation unit 38 executes the congestion control method based on the congestion control in the input connection setting process and the information indicating the congestion control method in the connection setting process stored in the second storage unit 37. A first congestion control command is generated. Further, the congestion control command generation unit 38 is based on the input information indicating the congestion control in the data communication process and the information indicating the congestion control method in the data communication process stored in the second storage unit 37. A second congestion control command is generated so as to execute Then, the congestion control command generation unit 38 gives identification information of the communication device to the first congestion control command and the second congestion control command and sends the identification information to the communication device side transmission unit 39.
[0046]
The communication device side transmission unit 39 transmits the first congestion control command and the second congestion control command to the corresponding communication device based on the identification information of the communication device.
[0047]
(I / O device)
The input / output device 4 has a function of outputting a determination result sent from the first congestion determination unit 33 or the second congestion determination unit 34. Further, the operator can input the effect of congestion control in the connection setting process and the effect of congestion control in the data communication process by a key operation or the like to the input / output device 4.
[0048]
(Communication method)
A communication method using the communication system configured as described above will be described below.
[0049]
(1) Transmission / reception of connection signals and data signals between communication devices
In the communication system, connection signals and data signals are transmitted and received between the communication devices. FIG. 5 is a sequence diagram showing the concept of the transmission / reception method. A description will be given of transmission / reception between the communication device 1a and the communication device 1c as an example.
[0050]
First, the communication terminal device 2a sends a connection setting start signal to the communication device 1a (start of connection setting processing). At this time, the connection setting start signal includes information related to the destination server device 3c. In addition, each communication apparatus 1a-1d hold | maintains the positional information on the other communication apparatus of a communication system, communication terminal device 2a-2d, and the server apparatus 3c.
[0051]
The communication device 1a detects the communication device 1c connected to the destination device 3c. Then, the communication device 1a transmits a connection setting start signal to the communication device 1c (S100). The communication device 1c sends a connection setting start signal to the destination server device 3c.
[0052]
The server device 3c receives the connection setting start signal, and when the data communication is possible, the server device 3c sends a connection setting end signal to the communication device 1a via the communication device 1c (S105). When the communication device 1a sends a connection setting end signal to the communication terminal device 2a, the connection setting process ends.
[0053]
The communication terminal device 2a sends a data communication start signal to the server device 3c via the communication device 1a and the communication device 1c (S110, start of data communication processing). Then, data communication is performed between the communication terminal device 2a and the server device 3c via the communication devices 1a and 1c (S115).
[0054]
Then, when a data communication end signal is sent from the server device 3c to the communication terminal device 2a via the communication devices 1c and 1a (S120), the data communication processing is ended. The above processing is performed between the devices in the communication system.
[0055]
(2) Congestion determination in connection setting processing, congestion determination in data communication processing
FIG. 6 is a flowchart for explaining determination of congestion in the connection setting process and determination of congestion in the data communication process. A case of determining congestion in the communication device 1a will be described.
[0056]
Note that the above-described correspondence table is input by a correspondence table generation unit (not shown) by inputting, for example, information (a predetermined number of connection signals and a predetermined amount of data communication) required by an operator of the communication system to the communication control device 3. A correspondence table is generated and stored in the first storage unit 32.
[0057]
The communication unit 11 of the communication device sends a connection signal to be transmitted / received to / from another communication device or communication terminal device to the connection signal number measurement unit 12 and sends a data signal to the data communication amount measurement unit 13 (S200).
[0058]
The connection signal number measuring unit 12 measures the number of connection setting start signals and connection setting end signals sent from the communication unit 11 per unit time (S205). Then, the connection signal number measuring unit 12 gives the identification information of the communication device 1 a to the measured number of connection signals, and sends it to the communication unit 11. The data communication amount measuring unit 13 measures the data communication amount transmitted from the communication unit 11 per unit time (S210). Note that the order of S205 and S210 may be either first or in parallel. Then, the data communication amount measuring unit 13 gives the identification information of the communication device 1 a to the measured data communication amount and sends it to the communication unit 11.
[0059]
The communication unit 11 transmits the measured number of connection signals and data communication amount to the communication control device 3 via the communication line. The measured number of connection signals and the amount of data communication are received by the communication device side receiving unit 31. Then, the measured number of connection signals is sent to the first congestion judgment unit 33, and the measured data communication amount is sent to the second congestion judgment unit 34 (S220).
[0060]
The first congestion determination unit 33 reads the correspondence table from the first storage unit 32 and acquires a predetermined number of connection signals. Then, the first congestion determination unit 33 compares the measured number of connection signals with a predetermined number of connection signals, and determines whether or not the measured number of connection signals is larger (S230). If so, in step S235, the first congestion determination unit 33 determines that congestion in the connection setting process has occurred, assuming that the processing load in the connection setting process of the communication device 1a is large. If it is smaller, in step S240, the first congestion determination unit 33 determines that there is no congestion in the connection setting process, assuming that the processing load in the connection setting process of the communication device 1a is not large.
[0061]
Then, the first congestion determination unit 33 sends a determination result (whether or not there is congestion in the connection setting process in the communication device 1a) to the input / output device side transmission unit 35.
[0062]
The second congestion determination unit 34 reads the correspondence table from the first storage unit 32 and acquires a predetermined data communication amount. Then, the second congestion determination unit 34 compares the measured data communication amount with a predetermined data communication amount, and determines whether or not the measured data communication amount is larger (S250). If so, in step S255, the second congestion determination unit 34 determines that the processing load in the data communication processing of the communication device 1a is large and that congestion in the data communication processing has occurred. If it is smaller, in step S260, the second congestion determination unit 34 determines that there is no congestion in the data communication process, assuming that the processing load in the data communication process of the communication device 1a is not large.
[0063]
Then, the second congestion determination unit 34 sends the determination result (whether or not the data communication processing is congested in the communication device) to the input / output device side transmission unit 35. Note that either the processing from step S230 to step S240 and the processing from step S250 to step S260 may be performed first or in parallel.
[0064]
In the input / output device 4, the determination result by the first congestion determination unit 33 and the determination result by the second congestion determination unit 34 are output (S270).
[0065]
The operator of the communication system acquires the output determination result, and determines whether the processing load in the connection setting process of the communication device 1a is large or the processing load in the data communication process of the communication device 1a is large. be able to. As a result, the worker can independently handle the communication device 1a such as performing congestion control in the connection setting process and performing countermeasures such as performing congestion control in the data communication process.
[0066]
(3) Congestion control method for communication device
FIG. 7 is a flowchart for explaining a congestion control method for the communication apparatus. As an example, the input / output device 4 is congested in the connection setting process (the connection setting processing load is large) and the data communication process is congested in the communication device 1a (the data communication processing load is large). Consider the case where a message is output.
[0067]
The worker inputs, to the input / output device 4 by key operation or the like, to the communication device 1a, the congestion control in the connection setting process or the congestion control in the data communication process (S300). The input / output device 4 gives identification information of the communication device 1a to the effect of congestion control in the connection setting process and to the effect of congestion control in the data communication process. These pieces of information are sent to the communication control device 3.
[0068]
When the input / output device side receiving unit 36 of the communication control device 3 receives the congestion control in the connection setting process and the congestion control in the data communication process (S305), the congestion control in the connection setting process is performed. Information on congestion control in the process is sent to the congestion control command generator 38.
[0069]
In step S320, the congestion control command generation unit 38 reads information indicating the congestion control method in the connection setting process from the second storage unit 37, and generates a first congestion control command instructing to execute the congestion control method. . At this time, the congestion control command generator 38 gives the identification information of the communication device 1a to the first congestion control command.
[0070]
Similarly, the congestion control command generation unit 38 reads information indicating the congestion control method in the data communication process from the second storage unit 37, and generates a second congestion control command instructing to execute the congestion control method ( S325). At this time, the congestion control command generation unit 38 gives the identification information of the communication device 1a to the second congestion control command. Note that either step S320 or step S325 may be performed first or in parallel.
[0071]
Then, the congestion control command generation unit 38 sends the generated first congestion control command and second congestion control command to the communication device side transmission unit 39. The communication device side transmission unit 39 transmits the first congestion control command and the second congestion control command to the communication device 1a based on the identification information of the communication device 1a.
[0072]
Upon receiving the first congestion control command and the second congestion control command, the communication unit 11 of the communication device 1a sends the congestion control unit 14 to the congestion control unit 14 (S330).
[0073]
The congestion control unit 14 controls congestion in the connection setting process of the communication device 1a based on the first congestion control command, and controls congestion in the data communication process based on the second congestion control command (S340). Specifically, the congestion control unit 14 controls the communication unit 11 to decrease the number of times of transmission / reception of the connection setting start signal based on the first congestion control command. Similarly, the congestion control unit 14 controls the communication unit 11 to reduce the amount of data transmitted and received based on the second congestion control command.
In the above description, the determination and control of congestion in the connection setting process and the determination and control of congestion in the data communication process have been described. However, it is also possible to determine and control the congestion of one of the processes.
[0074]
When the first congestion determination unit 33 and the second congestion determination unit 34 determine that the congestion in the connection setting process or the congestion in the data communication process has not occurred, the fact is notified via the communication device side transmission unit 39. , It may be transmitted to the communication device.
[0075]
In this case, when it is sent to the congestion control unit 14 that congestion in the connection setting process has not occurred, the congestion control unit 14 cancels the congestion control in the connection setting process. Similarly, when it is sent to the congestion control unit 14 that the congestion in the data communication process does not occur, the congestion control unit 14 cancels the congestion control in the data communication process.
[0076]
Further, when the first congestion determination unit 33 determines that congestion has occurred in the connection setting process, or when the second congestion determination unit 34 has determined that congestion has occurred in the data communication process. This may be automatically sent to the congestion control unit 14. The congestion control command generation unit 38 may generate a first congestion control command or a second congestion control command based on the fact that the congestion has occurred.
[0077]
(Function and effect)
According to the present embodiment, the connection signal number measurement unit 12 and the data communication amount measurement unit 13 are provided. For this reason, it becomes possible to measure the number of connection signals transmitted and received by the communication device with other communication devices and communication terminal devices. In addition, it is possible to measure the amount of data signals transmitted / received by the communication device to / from other communication devices and communication terminal devices.
[0078]
Then, the first congestion determination unit 33 compares the number of measured connection signals with a predetermined number of connection signals determined in consideration of the processing capability of the communication device, so that the processing load at the connection setting processing stage of the communication device is reduced. It can be determined whether or not it is large. If so, it can be determined that congestion has occurred in the connection setting process. Similarly, the second congestion determination unit 34 compares the measured data communication amount with a predetermined data communication amount determined in consideration of the processing capability of the communication device, so that the processing load in the data communication processing stage of the communication device is reduced. It can be determined whether or not it is large. If it is large, it can be determined that congestion has occurred in the data communication process.
[0079]
Therefore, unlike the prior art, it is not possible to determine only the processing load at the connection setting processing stage, and it is possible to determine the processing loads at the connection setting processing stage and the data communication processing stage. As a result, the operator can perform appropriate congestion control in a connection setting process stage and a data communication process stage.
[0080]
In the present embodiment, the congestion control command generation unit 38 generates a first congestion control command and a second congestion control command. The congestion control unit 14 can control congestion in the connection setting process based on the first congestion control command and can control congestion in the data communication process based on the second congestion control command.
[0081]
As a result, unlike the conventional technique, even if the processing load of the communication device is large, only the congestion in the connection setting process can be controlled, and the congestion control in the connection setting process and the congestion control in the data communication process can be performed. Therefore, the congestion control of the communication device can be performed more effectively than in the prior art.
[0082]
(Modification 1)
In the present embodiment, the processing capabilities of all the communication devices are considered to be equivalent. However, in a case where they are different, the predetermined number X of connection signals in the correspondence table stored in the first storage unit 32 described above is used. The predetermined data communication amount Y is different for each of the communication devices 1a to 1d. In such a case, the following is also possible. That is, the correspondence table as shown in FIG. 4 stored in the first storage unit 32 is associated with the identification information of each communication device 1a to 1d, and is provided for each communication device 1a to 1d.
[0083]
Then, in the flowchart shown above, in step S230, the first congestion determination unit 33 reads the correspondence table corresponding to the identification information of the communication device given to the measured number of connection signals, and acquires a predetermined number of connection signals. To do. Similarly, in step S250, the second congestion determination unit 34 reads a correspondence table corresponding to the identification information of the communication device given to the measured data communication amount, and acquires a predetermined data communication amount. Other than this, the processing is the same as that in the flowchart shown in FIG.
[0084]
(Modification 2)
In the first embodiment, the transmission processing capability, which is the processing capability for the communication device to transmit the connection signal and the data signal, is considered to be equivalent to the reception processing capability, which is the processing capability for the communication device to receive the connection signal and the data signal. It was.
[0085]
However, there are cases where the transmission processing capability and the reception processing capability are different. In such a case, it can also be performed as follows.
[0086]
The connection signal number measurement unit 12 of the second modification measures the number of connection signals to be transmitted and the number of connection signals to be received separately. The data communication amount measuring unit 13 measures the data communication amount to be transmitted and the data communication amount to be received separately.
[0087]
The correspondence table stored in the first storage unit 32 includes a predetermined number of connection signals for transmission, a predetermined number of connection signals for reception, a predetermined amount of data communication for transmission, and predetermined data for reception. The amount of communication is included. Then, the first congestion judgment unit 33 judges the congestion in the connection setting process separately for transmission and reception. Similarly, the second congestion determination unit 34 determines the determination of congestion in data communication processing separately for transmission and reception.
[0088]
The second storage unit 37 includes a congestion control method for connection setting processing for transmission, a congestion control method for connection setting processing for reception, a congestion control method for data communication processing for transmission, and a data communication processing for reception. A congestion control method is stored.
[0089]
Then, the congestion control command generation unit 38 generates a first congestion control command for transmission based on the congestion control method of the connection setting process for transmission, and receives it based on the congestion control method of the connection setting process for reception. A first congestion control command for transmission, a second congestion control command for transmission is generated based on a congestion control method for data communication processing for transmission, and a reception is performed based on the congestion control method for data communication processing for reception The second congestion control command is generated.
[0090]
Then, the congestion control unit 14 decreases the number of connection signals scheduled to be transmitted to the communication unit 11 based on the first transmission congestion control command, and based on the first reception congestion control command, the communication unit 11. On the other hand, the number of connection signals to be received is decreased, and based on the second congestion control command for transmission, the number of data start signals scheduled to be transmitted is decreased to the communication unit 11 and the second congestion control command for reception is set. Based on this, the number of data start signals to be received is reduced with respect to the communication unit 11.
[0091]
Embodiment 2. FIG.
In the communication system according to the second embodiment, the configurations of the communication devices 1a to 1d are different as follows. FIG. 8 is a diagram illustrating a configuration of communication apparatuses 1a to 1d according to the second embodiment. In the present embodiment, the same configurations and functions as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
[0092]
(Constitution)
The communication devices 1a to 1d acquire the CPU 50 that controls each unit and the processing amount per unit time of the CPU 50. Based on this processing amount, if the processing load of the entire communication device is large, congestion occurs. A communication device congestion determination unit 51 that determines that the communication device is present.
[0093]
The communication device congestion determination unit 51 holds information indicating a predetermined processing amount. This predetermined amount of processing is determined based on, for example, the maximum processing capacity of CPU 50 (the maximum amount of work that can be processed per unit time).
[0094]
(Communication method)
FIG. 9 is a flowchart illustrating a congestion determination method in the connection setting process using the communication system according to the second embodiment and a congestion determination method in the data communication process.
[0095]
In step S400, the communication device congestion determination unit 51 determines whether or not the communication device is congested. Specifically, the communication device congestion determination unit 51 acquires the processing amount of the CPU 50 per unit time. Then, the communication device congestion determination unit 51 compares the predetermined processing amount held with the processing amount per unit time of the CPU 50. If the processing amount per unit time of the CPU 50 is larger, step S410 is performed. Then, the connection signal number measuring unit 12 is instructed to acquire the number of connection signals sent from the communication unit 11 and start the measurement operation, and the data communication amount measuring unit 13 is also notified from the communication unit 11. Get the data signal sent and command to start the measurement operation. Thereafter, the processing after step S205 is performed.
[0096]
On the other hand, if the processing amount per unit time of the CPU 50 is smaller, the process proceeds to step S400.
[0097]
In the present embodiment, in addition to the effects shown in the first embodiment, only when the communication device congestion determination unit 51 determines that the communication device is congested, the connection signal number measurement unit 12, the data communication amount The measurement unit 13 performs the measurement operation and the determination operation by the first congestion determination unit 33 and the second congestion determination unit 34. For this reason, it is not necessary to perform the above measurement operation and determination operation when there is clearly no congestion, and the above measurement operation and determination operation is performed only when there is a high possibility of congestion. The resources of each device can be used effectively.
[0098]
【The invention's effect】
As described above, when data communication is performed, it is possible to separately determine the processing load at the connection setting processing stage of the communication device and the processing load at the data communication stage. For this reason, it is possible to independently handle the communication apparatus such as performing congestion control in the connection setting process and performing countermeasures such as performing congestion control in the data communication process. As a result, when congestion occurs in the communication device, it is possible to deal with the problem more effectively than in the prior art.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a communication system according to a first embodiment.
FIG. 2 is a diagram showing a configuration of a communication apparatus according to the first embodiment.
FIG. 3 is a diagram illustrating a configuration of a communication control apparatus according to the first embodiment.
4 is a diagram illustrating an example of a correspondence table stored in a first storage unit according to Embodiment 1. FIG.
FIG. 5 is a sequence diagram illustrating a signal transmission / reception method between the communication apparatuses according to the first embodiment.
FIG. 6 is a flowchart for explaining a method of determining the congestion of the connection setting process and the congestion of the data communication process among the communication methods according to the first embodiment.
7 is a flowchart for explaining a method for controlling congestion of a connection setting process and congestion of a data communication process in the communication method according to the first embodiment. FIG.
FIG. 8 is a diagram illustrating a configuration of a communication apparatus according to a second embodiment.
FIG. 9 is a flowchart for explaining a method of determining congestion of a connection setting process and congestion of a data communication process among the communication methods according to the second embodiment.
FIG. 10 is a diagram showing a configuration of a conventional communication system.
FIG. 11 is a flowchart showing a conventional signal transmission / reception method between communication devices.
FIG. 12 is a conceptual diagram for explaining a method for determining and controlling a congestion of a connection setting process and a congestion of a data communication process among conventional communication methods.
[Explanation of symbols]
1a to 1d, 61a to 61d Communication device
2a to 2d, 62a to 62d Communication terminal device
3c server device
3,63 Communication control device
4,64 I / O device
11 Communication Department
12 Number of connected signals measurement unit
13 Data traffic measurement unit
14 Congestion control unit
31 Communication device side receiver
32 1st storage part
33 First congestion judgment unit
34 Second congestion judgment unit
35 Input / output device side transmitter
36 Input / output device side receiver
37 Second storage
38 Congestion control command generator
39 Communication device side transmitter
50 CPU
51 Communication device congestion judgment unit

Claims (4)

A communication system for determining the congestion of each communication device of a plurality of communication devices connected to each other via a communication line in a connection setting stage and a data communication stage,
Obtaining a processing amount per unit time in a CPU included in the communication device, comparing a predetermined processing amount determined in consideration of processing capacity per unit time in the CPU and the obtained processing amount; Communication device congestion determination means for determining congestion in the CPU based on a comparison result;
Measures the number of connection signals transmitted / received during connection setup before the communication device starts data communication with another communication device when the communication device congestion determination means determines that the CPU is congested First measuring means to perform,
A second measuring unit that measures a data communication amount that the communication device transmits and receives during data communication with another communication device when the communication device congestion determination unit determines that the CPU is congested;
Storage means for storing a predetermined number of connection signals and a predetermined amount of data communication determined in consideration of the processing capability of the communication device;
When congestion in the CPU is determined by the communication device congestion determination unit, the number of connection signals measured by the first measurement unit is compared with the predetermined number of connection signals, and the communication device is based on a comparison result. First congestion determination means for determining congestion at the connection setting stage in
When congestion in the CPU is determined by the communication device congestion determination unit, the data communication amount measured by the second measurement unit is compared with the predetermined data communication amount, and based on the comparison result, A communication system comprising: second congestion determination means for determining congestion at a data communication stage in the communication device. As congestion of communication devices connected to each other via a communication line, congestion at a connection setting step, which is a connection setting step performed before the communication device starts data communication with another communication device, and A communication apparatus that communicates with a communication control apparatus that determines congestion in a data communication stage, which is a stage in which a communication apparatus performs data communication with another communication apparatus,
CPU,
The processing amount per unit time in the CPU is acquired, the predetermined processing amount determined in consideration of the processing capacity per unit time in the CPU is compared with the acquired processing amount, and based on the comparison result Communication device congestion determination means for determining congestion in the CPU;
A first measuring means for measuring the number of connection signals transmitted / received during connection setting with another communication apparatus when congestion in the CPU is determined by the communication apparatus congestion determination means;
A second measuring means for measuring a data communication amount transmitted / received during data communication with another communication apparatus when congestion in the CPU is determined by the communication apparatus congestion determination means;
The measured connection signal number required for the communication control device to determine congestion at the connection setting stage, and the measured data communication amount required for the communication control device to determine congestion at the data communication stage. And a transmission means for transmitting the information to the communication control device. A communication control device that determines the congestion of each communication device of a plurality of communication devices connected to each other via a communication line in a connection setting stage and a data communication stage,
The communication device compares the processing amount per unit time in the CPU included in the communication device with a predetermined processing amount determined in consideration of the processing capacity per unit time in the CPU, and based on the comparison result When the congestion in the CPU is determined, the measurement connection is a result of measuring the number of connection signals transmitted and received during connection setting performed by the communication device before starting data communication with another communication device. Receiving means for receiving the number of signals, and receiving the measurement data communication amount as a result of measuring the data communication amount that the communication device transmits and receives during data communication with other communication devices;
Storage means for storing a predetermined number of connection signals and a predetermined amount of data communication determined in consideration of the processing capability of the communication device;
A first congestion determination unit that compares the number of measured connection signals with the predetermined number of connection signals, and determines congestion at a connection setting stage in the communication device based on a comparison result;
A connection setting step comprising: a second congestion determination unit that compares the measured data communication amount with the predetermined data communication amount and determines congestion of the data communication step in the communication device based on the comparison result; And a communication control device divided into data communication stages. A communication method for determining the congestion of each communication device of a plurality of communication devices connected to each other via a communication line, divided into a connection setting stage and a data communication stage,
Obtaining a processing amount per unit time in a CPU included in the communication device, comparing a predetermined processing amount determined in consideration of processing capacity per unit time in the CPU and the obtained processing amount; A communication device congestion determination step for determining congestion in the CPU based on a comparison result;
A first measurement step of measuring the number of connection signals transmitted / received during connection setting performed before the communication device starts data communication with another communication device;
A second measuring step of measuring a data communication amount transmitted and received during data communication between the communication device and another communication device;
Storing a predetermined number of connection signals and a predetermined amount of data communication determined in consideration of the processing capability of the communication device in a storage unit;
A first congestion determination step of comparing the number of connection signals measured in the first measurement step with the predetermined number of connection signals, and determining congestion at a connection setting stage in the communication device based on a comparison result;
A second congestion determination step of comparing the data communication amount measured in the second measurement step with the predetermined data communication amount, and determining congestion in the data communication stage in the communication device based on the comparison result; And
In the first measurement step and the second measurement step, the measurement is performed when the congestion in the CPU is determined in the communication device congestion determination step, and the first congestion determination step and the second congestion determination are performed. In the determination step, the determination is performed when congestion in the CPU is determined in the communication device congestion determination step.

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