JP4819860B2 - Traffic control device, traffic control program, program recording medium, and traffic control method - Google Patents

Description

  The present invention relates to a traffic control device, a traffic control program, a program recording medium, and a traffic control method for controlling traffic in order to eliminate or prevent congestion in a communication network such as an IP network.

In a communication network such as an IP network, congestion occurs when communication requests are excessively concentrated on a specific device. This congestion can be eliminated or prevented by controlling the traffic of the communication network, and a method and an apparatus for that purpose have been devised (for example, see Patent Document 1).
JP 2002-26981 A (pages 6 to 9, FIG. 5)

  However, in the method and apparatus as described above, since it is necessary to provide means for determining whether congestion or a sign of the occurrence has occurred for each network component device such as a router (relay device), construction, maintenance and inspection As a result, the cost for improvement work and the like increased, and a person skilled in the art was burdened.

  In view of such circumstances, it is an object of the present invention to provide a traffic control device, a traffic control program, a program recording medium, and a traffic control method capable of accurately controlling traffic with reduced costs.

The present invention according to claim 1, a traffic control unit for controlling the traffic in order to eliminate the congestion in the IP network, a signal extraction means for extracting the call control signal by the SIP that are transmitted and received over the IP network, Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of uncompleted calls to a subscriber using a SIP response code; and the measured number of uncompleted calls Is compared with a predetermined threshold, and based on the comparison result, it is determined whether or not congestion has occurred. If it is determined that congestion has occurred as a result of the determination, the number of call connections is controlled. A congestion determination unit that determines a control amount for generating the traffic control information and generates congestion control information including information for specifying the control amount and the subscriber, and analyzes the congestion control information, based on the control amount. And at least one call connection control means for controlling the number of call connections by performing a call loss process on the call to the subscriber, and the congestion determination means has a plurality of congestions. If there is congestion to be preferentially resolved, if there is congestion to be preferentially resolved, the priority order among a plurality of congestions is determined, and the control is performed in the order of the priorities. The gist is to determine the amount.

  According to a second aspect of the present invention, in the first aspect of the invention, when there are a plurality of the call connection control means, the congestion control information is received from the congestion determination means, and the call is controlled based on the congestion control information. The gist of the present invention is to have a congestion control management means for specifying a call connection control means for controlling the number of connections and transmitting the congestion control information to the specified call connection control means.

According to a third aspect of the invention, a traffic control unit for controlling the traffic in order to prevent congestion in the IP network, a signal extraction means for extracting the call control signal by the SIP that are transmitted and received over the IP network, Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of uncompleted calls to a subscriber using a SIP response code; and the measured number of uncompleted calls Is compared with a predetermined threshold, and based on the comparison result, it is determined whether or not there is a sign of congestion. If the result of the determination is that there is a sign of congestion, Determining a control amount for controlling the number of connections, generating congestion control information including information for specifying the control amount and the subscriber, analyzing the congestion control information, And at least one call connection control means for controlling the number of call connections by performing a call loss process on the call to the subscriber based on a control amount, and the congestion determination means If multiple signs occur, determine whether there is a sign of congestion that should be prevented with priority. If there is a sign of congestion that should be prevented with priority, priority is given to the signs of congestion. The gist is to determine the order and to determine the control amounts in the order of the priorities.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, when there are a plurality of the call connection control means, the congestion control information is received from the congestion determination means, and the call is controlled based on the congestion control information. The gist of the present invention is to have a congestion control management means for specifying a call connection control means for controlling the number of connections and transmitting the congestion control information to the specified call connection control means.

The present invention is claimed in claim 5, wherein a traffic control program used in the traffic control device for controlling the traffic in order to eliminate the congestion in the IP network, SIP of the traffic control device, is transmitted and received over the IP network And a signal extracting means for extracting a call control signal by SIP and analyzing the extracted call control signal by SIP and measuring the number of call connections and the number of incomplete calls per unit time to a subscriber by means of a SIP response code The analyzing means compares the measured number of incomplete calls with a predetermined threshold, determines whether or not congestion has occurred based on the comparison result, and as a result of the determination, congestion has occurred. Is determined, a control amount for controlling the number of call connections is determined, and congestion control information including information for specifying the control amount and the subscriber is determined. And at least one call that controls the number of call connections by analyzing the congestion control information and performing a call loss process on the call to the subscriber based on the control amount. It functions as a connection control means, and when there is a plurality of congestions, the congestion determination means determines whether or not there is congestion to be preferentially eliminated, and there is congestion to be preferentially eliminated. In this case, the gist is to determine a priority order among a plurality of congestions and to function as determining the control amount in the order of the priority order.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, when the traffic control device has a plurality of the call connection control means, the traffic control device receives the congestion control information from the congestion determination means. And specifying a call connection control means for controlling the number of call connections based on the congestion control information, and causing the specified call connection control means to function as a congestion control management means for transmitting the congestion control information. The gist.

The present invention is claimed in claim 7, a traffic control program used in the traffic control device for controlling the traffic in order to prevent congestion in the IP network, SIP of the traffic control device, is transmitted and received over the IP network And a signal extracting means for extracting a call control signal by SIP and analyzing the extracted call control signal by SIP and measuring the number of call connections and the number of incomplete calls per unit time to a subscriber by means of a SIP response code The analysis means compares the measured number of incomplete calls with a predetermined threshold value, determines whether or not there is a sign of congestion based on the comparison result, and as a result of the determination, the sign of congestion is If it is determined that a call is occurring, a control amount for controlling the number of call connections is determined, and a radio wave including information for specifying the control amount and the subscriber is determined. Congestion determination means for generating congestion control information, and analyzing the congestion control information, and controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount It functions as a single call connection control means, and when there are a plurality of signs of congestion, the congestion judgment means judges whether or not there is a sign of congestion that should be preferentially prevented. If there is a sign of congestion that should be prevented, the priority is determined among a plurality of signs of congestion, and the control amount is determined in order of the priority.

  According to an eighth aspect of the present invention, in the seventh aspect of the invention, when the traffic control device has a plurality of the call connection control means, the traffic control device receives the congestion control information from the congestion judgment means. And specifying a call connection control means for controlling the number of call connections based on the congestion control information, and causing the specified call connection control means to function as a congestion control management means for transmitting the congestion control information. The gist.

The present invention according to claim 9 is a program recording medium that records a traffic control program used in a traffic control device that controls traffic in order to eliminate congestion in an IP network , and the traffic control device is connected to the IP network. A signal extraction means for extracting a call control signal based on SIP transmitted / received above, and analyzing the extracted call control signal based on SIP , and determining the number of call connections per unit time and the number of uncompleted calls to a subscriber . Signal analysis means for measuring by response code , comparing the measured number of incomplete calls with a predetermined threshold, and determining whether congestion has occurred based on the comparison result, the result of the determination, When it is determined that congestion has occurred, a control amount for controlling the number of call connections is determined, and the control amount and the subscriber are specified. Call determination means for generating congestion control information including information for analyzing the call, and analyzing the congestion control information and performing call loss processing on the call to the subscriber based on the control amount Functioning as at least one call connection control means for controlling the number, and when there is a plurality of congestions, the congestion determination means determines whether there is congestion to be preferentially eliminated, The gist is that when there is congestion to be eliminated, a priority order among a plurality of congestions is determined, and a traffic control program that functions as determining the control amount in the order of the priorities is recorded.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, when the traffic control device has a plurality of the call connection control means, the traffic control device receives the congestion control information from the congestion determination means. Traffic control that specifies call connection control means for controlling the number of call connections based on the congestion control information and causes the specified call connection control means to function as congestion control management means for transmitting the congestion control information. The summary is that the program was recorded.

The present invention according to claim 11 is a program recording medium recording a traffic control program used in a traffic control device for controlling traffic to prevent congestion in an IP network , wherein the traffic control device is connected to the IP network. A signal extraction means for extracting a call control signal based on SIP transmitted / received above, and analyzing the extracted call control signal based on SIP , and determining the number of call connections per unit time and the number of uncompleted calls to a subscriber . The signal analysis means that measures the response code , compares the measured number of incomplete calls with a predetermined threshold, determines whether or not there is a sign of congestion based on the comparison result, As a result, when it is determined that there is an indication of congestion, a control amount for controlling the number of call connections is determined, and the control amount and the subscription are determined. Congestion determination means for generating congestion control information including information for specifying a subscriber, and analyzing the congestion control information and performing a call loss process on the call to the subscriber based on the control amount To function as at least one call connection control means for controlling the number of call connections, and when the congestion determination means has a plurality of signs of congestion, there is no sign of congestion to be preferentially prevented. Functions to determine whether or not there is a sign of congestion that should be prevented preferentially, determine the priority among the signs of congestion, and determine the control amount in the order of the priority The summary is that the traffic control program to be recorded is recorded.

  According to a twelfth aspect of the present invention, in the invention according to the eleventh aspect, when the traffic control device has a plurality of the call connection control means, the traffic control device receives the congestion control information from the congestion determination means. Traffic control that specifies call connection control means for controlling the number of call connections based on the congestion control information and causes the specified call connection control means to function as congestion control management means for transmitting the congestion control information. The summary is that the program was recorded.

A thirteenth aspect of the present invention is a traffic control method using a traffic control device for controlling traffic in order to eliminate congestion in an IP network , wherein the traffic control device is based on SIP transmitted / received on the IP network. a signal extracting step of extracting a call control signal, analyzes the call control signal by the extracted SIP, signal analysis to measure the number of connections and the number of uncompleted calls calls per unit time for the subscriber by the SIP response code Comparing the measured number of incomplete calls with a predetermined threshold value and determining whether or not congestion has occurred based on the comparison result, and as a result of the determination that congestion has occurred If determined, a control amount for controlling the number of call connections is determined, and congestion control information including information for specifying the control amount and the subscriber is determined. A congestion determination step to be generated; and the congestion control information is analyzed, and based on the control amount, call loss processing is performed on the call to the subscriber to control at least one call connection number. A connection control step, and in the congestion determination step, when a plurality of congestions occur, it is determined whether there is congestion to be preferentially resolved, and if there is congestion to be preferentially resolved, The gist is to determine a priority among a plurality of congestions and to determine the control amount in the order of the priorities.

  According to a fourteenth aspect of the present invention, in the invention according to the thirteenth aspect, when the traffic control device has a plurality of call connection control means for executing the call connection control step, the traffic control device is provided with the congestion control information. A congestion control management step of specifying a call connection control means for controlling the number of call connections based on the congestion control information and transmitting the congestion control information to the specified call connection control means This is the gist.

The present invention according to claim 15 is a traffic control method using a traffic control device for controlling traffic in order to prevent congestion in an IP network , wherein the traffic control device is based on SIP transmitted / received on the IP network. a signal extracting step of extracting a call control signal, analyzes the call control signal by the extracted SIP, signal analysis to measure the number of connections and the number of uncompleted calls calls per unit time for the subscriber by the SIP response code Comparing the measured number of incomplete calls with a predetermined threshold, and determining whether or not there is a sign of congestion based on the comparison result. As a result of the determination, a sign of congestion is generated. If it is determined that the number of connections is determined, a control amount for controlling the number of call connections is determined, and a radio wave including information for specifying the control amount and the subscriber is determined. A congestion determination step for generating congestion control information; and analyzing the congestion control information, and controlling call connection number by performing call loss processing for the call to the subscriber based on the control amount One call connection control step, and in the congestion determination step, when a plurality of congestion signs occur, it is determined whether or not there is a congestion sign that should be preferentially prevented. When there is a sign of congestion to be prevented, the gist is to determine a priority among a plurality of signs of congestion and to determine the control amount in the order of the priority.

  According to a sixteenth aspect of the present invention, in the invention according to the fifteenth aspect, when the traffic control device has a plurality of call connection control means for executing the call connection control step, the traffic control device is configured to control the congestion control information. A congestion control management step of specifying a call connection control means for controlling the number of call connections based on the congestion control information and transmitting the congestion control information to the specified call connection control means This is the gist.

  As described above, the call connection control means analyzes the congestion control information, and controls the number of call connections by performing a call loss process on the call to the subscriber based on the connection control amount. It can be eliminated or prevented.

  In addition, since the signal extraction means extracts the call control signal transmitted / received on the communication network, and the congestion determination means collectively determines, a means for determining whether congestion or its sign is occurring is configured in the network. There is no need to provide each device, and the cost can be reduced.

  Therefore, it is possible to provide a traffic control device, a traffic control program, a program recording medium, and a traffic control method that can reduce costs and control traffic accurately.

  Hereinafter, a traffic control device, a traffic control program, a program recording medium, and a traffic control method of the present invention will be described with reference to the drawings.

  It should be noted that the following embodiments are merely for explaining the present invention, and do not limit the scope of the present invention. Accordingly, those skilled in the art can employ various embodiments including each or all of these elements, and these embodiments are also included in the scope of the present invention.

  In all the drawings for explaining the embodiments, the same elements are given the same reference numerals, and the repeated explanation thereof is omitted.

  FIG. 1 is a block diagram showing a configuration of a traffic control apparatus according to an embodiment of the present invention.

  The traffic control device includes a signal extraction unit 2 provided in the signal extraction device 1, a signal analysis unit 4 and a congestion determination unit 5 provided in the congestion detection device 3, and a congestion control management provided in the congestion control management device 6. Unit 7, a call connection control unit 9a provided in the call connection control device 8a, and a call connection control unit 9b provided in the call connection control device 8b.

  The call connection control device 8a (call connection control unit 9a) is connected to an IP telephone terminal (hereinafter referred to as “terminal”) 11a via a signal extraction device 1 (signal extraction unit 2) and an IP (Internet Protocol) network 10a. The call connection control device 8b (call connection control unit 9b) is connected to the terminals 11d, 11e, and 11f via the signal extraction device 1 (signal extraction unit 2) and the IP network 10b.

  In addition, in this Embodiment, although it was set as the structure which has two each, a call connection control apparatus and a call connection control part, it is not limited to this, It can also be set as the structure which has each one or three or more. it can.

  Further, the call connection control devices 8a and 8b are appropriately “call connection control device 8”, the call connection control units 9a and 9b are appropriately “call connection control unit 9”, the IP networks 10a and 10b are appropriately “IP network 10”, the terminal 11a, 11b, 11c, 11d, 11e, and 11f are collectively referred to as “terminal 11” as appropriate.

  Further, in this figure, for easy explanation, description of equipment for realizing an IP telephone network such as a soft switch is omitted.

  The signal extraction unit 2 extracts a call control signal transmitted / received between the terminals 11 via the IP network 10, and the signal analysis unit 4 analyzes the extracted call control signal and calls the terminal 11 per unit time. The number of connections, that is, the number of completed calls, and the number of calls that are not connected, that is, the number of incomplete calls (hereinafter referred to as “overflow call number” as appropriate) are measured.

  The congestion determination unit 5 compares the measured number of incomplete calls with a predetermined threshold, determines whether or not congestion or a sign of congestion has occurred based on the comparison result, and the result of the determination is congestion or congestion Information for determining the connection control amount for controlling the number of call connections and identifying the terminal (for example, 11a) where the call is concentrated. Congestion control information (control request) including (telephone number etc.) is generated.

  The congestion control management unit 7 receives the congestion control information from the congestion control management unit, and identifies a call connection control unit (call connection control unit 9a in this figure) that should control the number of call connections based on the congestion control information. Then, the congestion control information is transmitted to the call connection control unit 9a. A call connection control unit that controls the number of call connections is called a “control source”.

  The call connection control unit 9 analyzes the congestion control information, and controls the number of call connections by performing a call loss process on the call to the subscriber based on the connection control amount. This makes it possible to eliminate or prevent congestion.

  In addition, since the signal extraction unit extracts a call control signal transmitted / received on the IP network and the congestion determination unit 5 performs the determination in a lump, there is provided a means for determining whether congestion or a sign thereof has occurred. It is not necessary to provide each component device, and the cost can be reduced.

  In addition, said operation | movement is performed repeatedly according to a predetermined period.

  FIG. 2 is a block diagram showing the configuration of the signal extraction unit 2 in FIG. 1. The signal extraction unit 2 includes a call control signal relay unit 21 that relays the call control signal, and a call control signal replication that replicates the call control signal. The unit 22 and the copied call control signal are transmitted to the signal analysis unit 4.

  That is, as shown in FIG. 7, the operation of the signal extraction unit 2 extracts only the call control signal, duplicates it, and transmits it to the signal analysis unit.

  3 is a block diagram showing the configuration of the signal analysis unit 4 in FIG. 1. The signal analysis unit 4 includes a call control signal reception unit 41 that receives a call control signal from the signal extraction unit 2, and the received call control. The measurement results of the overflow call number measurement unit 42 that analyzes the signal and measures the number of overflow calls, the connection call number measurement unit 43 that measures the number of connected calls, the overflow call number measurement unit 42, and the connection call number measurement unit 43 are shown. A measurement result transmission unit 44 that transmits to the congestion determination unit 5 is provided.

The overflow call number measured by the overflow call number measurement unit 42 is expressed by the following equation (1).

  In the above equation (1), y1 indicates the number of overflow calls, x1 indicates the number of overflow calls (incomplete calls) in each terminal, and t0 is the starting point of the measurement period of the overflow call count (however, the first measurement is T1 indicates the end point of the overflow call count measurement period.

  That is, the number of overflow calls measured is the total amount of overflow calls per unit time at the terminal to be monitored.

The number of connected calls measured by the connected call number measuring unit 43 is expressed by the following equation (2).

  In the above equation (2), y2 indicates the number of connected calls, x2 indicates the number of connected calls (completed calls) in each terminal, t0 indicates the starting point of the measurement period of the number of connected calls, and t1 indicates the number of connected calls. The end point of the measurement cycle.

  That is, the number of connected calls to be measured is the total amount per unit time of the number of connected calls in the terminal to be monitored.

  FIG. 4 is a block diagram illustrating a configuration of the congestion determination unit 5 of FIG.

  The measurement result receiving unit 51 receives the measurement result from the signal analysis unit 4, and the determination execution unit 52 determines whether or not congestion or a sign of congestion has occurred based on the received measurement result.

  The priority order determination unit 53 determines the priority order of the subsequent processes when there are a plurality of congestions or signs of congestion and congestion that should be resolved or prevented with priority is determined.

The connection control amount determination unit 54 determines the connection control amount described above. In this case, the priority order determined by the priority order determination unit 53 is also reflected.

The congestion control information generation unit 55 generates congestion control information including the connection control amount and the telephone number of the terminal on which the call is concentrated, and the congestion control information transmission unit 56 manages the generated congestion control information with the congestion control management. Send to part 7.

  The control status information receiving unit 57 and the control status information storage unit 58 will be described later.

  In addition, the congestion determination is performed based on the measurement result of the number of overflow calls (cumulative value in the measurement cycle unit). If the number of overflow calls of the terminal is larger than the above-described threshold, congestion or an indication of congestion occurs. It is determined that

  However, for a terminal that is already in connection control, the determination is not performed until the connection control is canceled.

  The connection control amount is represented by a total control code amount (number of calls / minute). This total control code amount is the maximum value of candidate A, candidate B, and candidate C.

  Candidate A is the default value (number of calls / control processing cycle), and candidate B is the product of the value obtained by the above equation (2) and a predetermined control amount calculation coefficient (number of calls / control processing cycle). Candidate C is a connection control amount applied to the previous control period.

  However, if no control request has been made yet, that is, no congestion control information has been transmitted, there is no candidate C, and the total amount of control code is calculated using only candidates A and B.

  FIG. 5 is a block diagram illustrating a configuration of the congestion control management unit 7.

  The measurement result receiving unit 71 receives the congestion control information from the congestion determining unit 5, and the control source determining unit 72 grasps which terminal is connected to which call connection control unit, that is, which terminal is under management. The call connection control unit to be connected, that is, the control source (call connection control unit 9a in the example shown in FIG. 1) is specified from the telephone number included in the congestion control information.

  When the control source is specified, the connection control instruction signal generation unit 73 generates a connection control instruction signal based on the received congestion control information, and the connection control instruction signal transmission unit 74 generates the generated connection control instruction signal. Is transmitted to the specified control source.

  Note that the control source determination unit 72 is not provided, that is, the control source is not specified, and the connection control instruction signal is sent to all the call connection control units (call connection control units 9a and 9b in the example shown in FIG. 1). Each of the call connection control units analyzes the connection control instruction signal, and as a result, if the terminal that is the target of connection control is under management, connection control is performed for that target.

  The instruction response signal receiving unit 75, the traffic information receiving unit 76, the control status information generating unit 77, and the control status information transmitting unit 78 will be described later.

  FIG. 6 is a block diagram showing a configuration of the call connection control unit 9 of FIG.

  The connection control instruction signal receiving unit 91 receives the connection control instruction signal from the congestion control management unit 7, and the connection control execution unit 92 controls connection based on the received connection control instruction signal, that is, based on the connection control amount. I do. In order to maintain the predetermined number of connections determined by this connection control amount, no extra calls are connected. This is called call loss processing.

  When the connection control is performed by the connection control execution unit, the instruction response signal generation unit 93 generates an instruction response signal indicating the fact, and the instruction response signal transmission unit 94 converts the generated instruction response signal into the congestion control management. Send to part 7.

  The traffic monitoring unit 95 monitors traffic in the IP network 10, the traffic information generating unit 96 generates traffic information indicating the traffic monitoring result, and the traffic information transmitting unit 97 congests the generated traffic information. It transmits to the control management part 7.

  The above operations are executed by all the call connection control units 9 (call connection control units 9a and 9b in the case shown in FIG. 1).

  The instruction response signal transmitted from the call connection control unit 9 is received by the instruction response signal receiving unit 75 in FIG. 5, and the traffic information transmitted from the call connection control unit 9 is also received by the traffic information receiving unit 76 in FIG. Received.

  The control status information generation unit 77 in FIG. 5 generates control status information based on the received instruction response signal and traffic information. By generating this control status information from the two types of information described above, it is possible to obtain both the control history and the amount of change in traffic due to this control, that is, the success or failure of the control.

  The control status information transmission unit 78 transmits the generated control status information to the congestion determination unit 5.

  The control status information transmitted from the congestion control management unit 7 as described above is received by the control status information receiving unit 57 in FIG. 4, and the received control status information is stored in the control status information storage unit 58.

  The above-described determination execution unit 52 uses this control status information when making a determination.

  FIG. 8 is a sequence diagram showing the operation of the traffic control device.

  When the call control signal is duplicated by the signal extraction unit 2 (S1) and transmitted (S2), it is received by the signal analysis unit 4 (S3), the number of overflow calls is measured (S4), and the number of connected calls is further measured. Then, the measurement result is transmitted (S6).

The transmitted measurement result is received by the congestion determination unit 5 (S7), and a determination is made (S8). When it is determined that congestion (including signs of congestion in the figure) has occurred (S8). : Yes), it is confirmed whether multiple congestions are occurring (S9). If multiple congestions are occurring (S9: Yes), there is congestion that should be preferentially eliminated or prevented, in other words, whether there is a priority service. (S10: Yes), the priority order is determined (S11), and the connection control amount is determined (S12).

  When the connection control amount is determined, congestion control information is generated (S13), and the generated congestion control information is transmitted (S14).

  If it is determined that congestion has not occurred (S8: No), the measurement result is received, and if multiple congestions have not occurred (S9: No), the connection control amount is immediately determined. (S12) Even when the priority service does not exist (S10: No), the connection control amount is immediately determined (S12).

  A configuration may be adopted in which the number of overflow calls is measured after the number of connected calls is measured.

  The congestion control information transmitted in S14 is received by the congestion control management unit 7 (S15), a control source is determined (S16), a connection control instruction signal is generated (S17), and the generated connection control instruction signal is It is transmitted (S18).

  The transmitted connection control instruction signal is received by the call connection control unit 9 (S19), and connection control is performed (S20).

  In addition, when the traffic control device described above handles a call control signal using SIP (Session Initiation Protocol), the procedure shown in FIG. 9 (S101 to S111) is used to measure overflow calls and connected calls. In rare cases, each determination is made based on the response code in the figure.

  In the figure, the response code 180 is “Ringing”, the response code 200 is “OK”, the response code 401 is “Unauthorized”, and the response code 407 is “Proxy Authentication Required”. The response code 503 indicates “Service Unavailable”.

  Further, the meanings of the above response codes are classified in hundreds. In the figure, 4xx (400 series) is "request failure response", 5xx (500 series) is "failure response at server", 6xx. (600 range) indicates “global failure response”.

  The above traffic control devices include a CPU (Central Processing Unit), a hard disk drive, a ROM (Read Only Memory), a RAM (Random Access Memory), a keyboard, a display, a flexible disk drive, and a communication network for communication. It is possible to use a computer having a communication unit or the like for performing. At this time, the computer is caused to read and execute a traffic control program for executing the functions of the aforementioned units.

  Therefore, the scope of the present invention includes the above-described traffic control program and a computer-readable program recording medium such as a flexible disk, a CD-ROM (Compact Disk Read Only Memory), and a PC card on which the program is recorded.

  A traffic control method using such a traffic control device is also included in the scope of the present invention.

It is a block diagram which shows the structure of the structure of the traffic control apparatus of this invention. It is a block diagram which shows the structure of the signal extraction part of FIG. It is a block diagram which shows the structure of the signal analysis part of FIG. It is a block diagram which shows the structure of the congestion determination part of FIG. It is a block diagram which shows the structure of the congestion control management part of FIG. FIG. 2 is a block diagram illustrating a configuration of a call connection control unit in FIG. 1. It is a figure explaining the call signal extraction by the signal extraction part of FIG. It is a figure which shows the effect | action of the traffic control apparatus of FIG. It is a figure which shows the state transition of the call in which SIP was used.

Explanation of symbols

1 Signal extraction device
2 signal extraction unit
3 Congestion detection device
4 Signal analysis section
5 Congestion judgment unit
6 Congestion control management device
7 Congestion control manager
8a, 8b Call connection control device 9a, 9b Call connection control unit
10a, 10b IP network
11a, 11b, 11c, 11d, 11e, 11f terminal
21 Call control signal relay
22 Call control signal replica
23 Call control signal transmitter
41 Call control signal receiver
42 Overflow call count measurement unit
43 Number of connected calls measurement unit
44 Measurement result transmitter
51 Measurement result receiver
52 Judgment execution unit
53 Priority determining unit
54 Connection control amount determination unit
55 Congestion control information generator
56 Congestion control information receiver
57 Control status information receiver
58 Control status information storage unit
71 Congestion control information receiver
72 Control Source Determination Unit
73 Connection control instruction signal generator
74 Connection control instruction signal transmitter
75 Instruction response signal receiver
76 Traffic information receiver
77 Control status information generator
78 Control status information transmitter
91 Connection control instruction signal receiver
92 Connection control execution unit
93 Instruction response signal generator
94 Instruction response signal transmitter
95 Traffic monitoring unit
96 Traffic information generator
97 Traffic information transmitter

Claims (16)

A traffic control device for controlling traffic to eliminate congestion in an IP network ,
A signal extraction means for extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to a subscriber by means of a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not congestion has occurred based on the comparison result. As a result of the determination, it is determined that congestion has occurred. A congestion determination means for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing at least one of the congestion control information, and performing at least one call connection control unit by performing a call loss process on the call to the subscriber based on the control amount; ,
The congestion determination means determines whether or not there is congestion that should be preferentially resolved when a plurality of congestions occur. If there is congestion that should be preferentially resolved, priority is given to a plurality of congestions. A traffic control device, wherein a priority is determined, and the control amount is determined in the order of the priority. When having a plurality of call connection control means,
The congestion control information is received from the congestion determination means, a call connection control means for controlling the number of call connections based on the congestion control information is specified, and the congestion control information is stored in the specified call connection control means. The traffic control apparatus according to claim 1, further comprising a congestion control management means for transmitting. A traffic control device that controls traffic in order to prevent congestion in an IP network ,
A signal extraction means for extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to a subscriber by means of a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not there is a sign of congestion based on the comparison result. As a result of the determination, a sign of congestion is generated. A congestion determining means for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing at least one of the congestion control information, and performing at least one call connection control unit by performing a call loss process on the call to the subscriber based on the control amount; ,
The congestion determination means determines whether or not there is a sign of congestion that should be prevented preferentially when there are multiple signs of congestion, and if there are signs of congestion that should be prevented preferentially, A traffic control device, characterized in that priority is determined among signs of congestion, and the control amount is determined in the order of priority. When having a plurality of call connection control means,
The congestion control information is received from the congestion determination means, a call connection control means for controlling the number of call connections based on the congestion control information is specified, and the congestion control information is stored in the specified call connection control means. 4. The traffic control apparatus according to claim 3, further comprising a congestion control management means for transmitting. A traffic control program used in a traffic control device for controlling traffic to eliminate congestion in an IP network ,
The traffic control device;
A signal extraction means for extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to a subscriber by means of a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not congestion has occurred based on the comparison result. As a result of the determination, it is determined that congestion has occurred. A congestion determination means for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing the congestion control information and functioning as at least one call connection control means for controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount And
When there is a plurality of congestions, the congestion determination unit determines whether there is congestion that should be resolved with priority, and when there is congestion that should be resolved with priority, priority is given to a plurality of congestions. A traffic control program that functions as a device for determining a priority and determining the control amount in the order of priority. When the traffic control device has a plurality of the call connection control means,
The traffic control device receives the congestion control information from the congestion determination means, specifies call connection control means for controlling the number of call connections based on the congestion control information, and specifies the specified call connection control means 6. The traffic control program according to claim 5, wherein the traffic control program is made to function as a congestion control management means for transmitting the congestion control information. A traffic control program used in a traffic control device for controlling traffic to prevent congestion in an IP network ,
The traffic control device;
A signal extraction means for extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to a subscriber by means of a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not there is a sign of congestion based on the comparison result. As a result of the determination, a sign of congestion is generated. A congestion determining means for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing the congestion control information and functioning as at least one call connection control means for controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount And
The congestion determination means determines whether or not there is a sign of congestion that should be prevented preferentially when there are multiple signs of congestion, and if there are signs of congestion that should be prevented preferentially, A traffic control program for determining priority in signs of congestion and causing the control amount to be determined in order of the priority.   When the traffic control device has a plurality of the call connection control means, the traffic control device should receive the congestion control information from the congestion determination means and control the number of call connections based on the congestion control information. 8. The traffic control program according to claim 7, wherein a call connection control means is specified and functions as a congestion control management means for transmitting the congestion control information to the specified call connection control means. A program recording medium that records a traffic control program used in a traffic control device that controls traffic to eliminate congestion in an IP network ,
The traffic control device;
A signal extraction means for extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to a subscriber by means of a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not congestion has occurred based on the comparison result. As a result of the determination, it is determined that congestion has occurred. A congestion determination means for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing the congestion control information and functioning as at least one call connection control means for controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount;
When there is a plurality of congestions, the congestion determination unit determines whether there is congestion that should be resolved with priority, and when there is congestion that should be resolved with priority, priority is given to a plurality of congestions. A program recording medium having recorded thereon a traffic control program for determining the order and functioning to determine the control amount in the order of the priorities. When the traffic control device has a plurality of the call connection control means,
The traffic control device receives the congestion control information from the congestion determination means, specifies call connection control means for controlling the number of call connections based on the congestion control information, and specifies the specified call connection control means The program recording medium according to claim 9, wherein a traffic control program that functions as a congestion control management unit that transmits the congestion control information is recorded in the program recording medium. A program recording medium that records a traffic control program used in a traffic control device that controls traffic to prevent congestion in an IP network ,
The traffic control device;
A signal extraction means for extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to a subscriber by means of a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not there is a sign of congestion based on the comparison result. As a result of the determination, a sign of congestion is generated. A congestion determining means for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing the congestion control information and functioning as at least one call connection control means for controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount And
The congestion determination means determines whether or not there is a sign of congestion that should be prevented preferentially when there are multiple signs of congestion, and if there are signs of congestion that should be prevented preferentially, A program recording medium having recorded therein a traffic control program for determining priority in signs of congestion and functioning to determine the control amount in the order of priority. When the traffic control device has a plurality of the call connection control means,
The traffic control device receives the congestion control information from the congestion determination means, specifies call connection control means for controlling the number of call connections based on the congestion control information, and specifies the specified call connection control means 12. The program recording medium according to claim 11, wherein a traffic control program for functioning as a congestion control management means for transmitting the congestion control information is recorded in the program recording medium. A traffic control method using a traffic control device for controlling traffic in order to eliminate congestion in an IP network ,
The traffic control device comprises:
A signal extraction step of extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to the subscriber using a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not congestion has occurred based on the comparison result. As a result of the determination, it is determined that congestion has occurred. A congestion determination step for determining a control amount for controlling the number of call connections and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing the congestion control information and performing at least one call connection control step for controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount; ,
In the congestion determination step, when a plurality of congestions occur, it is determined whether or not there is congestion that should be resolved preferentially. If there is congestion that should be resolved preferentially, priority is given to the plurality of congestions. A traffic control method comprising: determining a ranking, and determining the control amount in the order of the priority. When the traffic control device has a plurality of call connection control means for executing the call connection control step,
The traffic control device receives the congestion control information, specifies call connection control means for controlling the number of call connections based on the congestion control information, and causes the specified call connection control means to specify the congestion control information. The traffic control method according to claim 13, wherein a congestion control management step of transmitting a message is executed. A traffic control method using a traffic control device for controlling traffic to prevent congestion in an IP network ,
The traffic control device comprises:
A signal extraction step of extracting a call control signal by SIP transmitted and received on the IP network ;
Analyzing the extracted SIP call control signal, and measuring the number of call connections per unit time and the number of incomplete calls to the subscriber using a SIP response code ;
The measured number of incomplete calls is compared with a predetermined threshold, and it is determined whether or not there is a sign of congestion based on the comparison result. As a result of the determination, a sign of congestion is generated. A congestion determination step for determining a control amount for controlling the number of call connections, and generating congestion control information including information for specifying the control amount and the subscriber;
Analyzing the congestion control information and performing at least one call connection control step for controlling the number of call connections by performing a call loss process on the call to the subscriber based on the control amount; ,
In the congestion determination step, when a plurality of congestion signs occur, it is determined whether or not there is a congestion sign that should be prevented preferentially. A traffic control method, comprising: determining a priority in a sign of congestion and determining the control amount in order of the priority. When the traffic control device has a plurality of call connection control means for executing the call connection control step,
The traffic control device receives the congestion control information, specifies call connection control means for controlling the number of call connections based on the congestion control information, and causes the specified call connection control means to specify the congestion control information. The traffic control method according to claim 15, wherein a congestion control management step of transmitting a message is executed.

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