JP5276633B2 - Congestion control method, congestion control apparatus, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform appropriate congestion control without duplicated notification of an order to an identical node to restrict connection to an identical telephone number band, even when a network configuration is changed during the execution of connection restriction. <P>SOLUTION: When congestion occurs in a telephone network including a plurality of call control devices for controlling call origination and termination and a relay device for relay connection of a call between the call control devices, a congestion control method orders the connection restriction by specifying a control target to a call control device. When connection restriction is ordered from the congestion control device to at least one call control device, if the call control device ordering the connection restriction is also fit for another condition that is determined that the connection restriction is also to be ordered due to a network configuration change, the congestion control method includes a duplicated order avoidance step so that the congestion control device does not issue, to the call control device concerned, a connection restriction order to the identical control target. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a congestion control method, a congestion control device, and a program for resolving congestion caused by concentration of calls in a specific area in a telephone network.

  2. Description of the Related Art Conventionally, in an IP (Internet Protocol) telephone network, as one countermeasure against congestion, a telephone number band accommodated by a congested server is transferred from a congestion control device to the network in order to stop the inflow of calls that cause congestion at the entrance of the network. All the soft switches and CTI-GW (Computer Telephony Integration-Gateway) are notified and directed to ground control (hereinafter referred to as connection control). Further, in Patent Document 1, as one of the congestion countermeasures in the public telephone network, the connection restriction is notified directly to the originating exchange as a response to the incoming call from the time when the called exchange detects the congestion. There has been disclosed a technique for performing quicker congestion control by instructing each switching unit from a congestion control device to specify the amount of connection restriction.

JP-A-5-22406

  In any of these conventional techniques, the congestion control apparatus holds the latest network configuration information in a database, and referring to this database, each node (soft switch, CTI-GW, and exchange is collectively referred to as a node). )) Has been determined the amount of regulation of connection restrictions. However, in the prior art, it was not assumed that the network configuration would be changed while connection restrictions were being made, so if the network configuration was changed during connection restrictions, the same node On the other hand, there is a problem that connection restriction instructions for the same control target (telephone number band, outgoing connection route, etc.) are repeatedly notified, and appropriate congestion control cannot be performed. Alternatively, the network configuration change work cannot be started while connection regulation is being performed, and there is a problem that appropriate congestion control cannot be performed if congestion occurs during the change work.

  The present invention has been made to solve the above-described problem, and even when the network configuration is changed while congestion occurs in the telephone network and connection regulation is performed, the same node is provided. It is an object of the present invention to provide a congestion control method, a congestion control apparatus, and a program that do not repeatedly notify connection restriction instructions to the same control target.

  In order to achieve the above object, the congestion control method of the present invention includes a plurality of call control devices each controlling call origination / termination of a call belonging to a predetermined telephone number band, and call relay connection between the call control devices. A congestion control method using a congestion control device that designates a control target and instructs connection restriction to the call control device in order to eliminate congestion that has occurred in a telephone network that includes two or more relay devices that perform communication. The congestion control device records a control object instructing the connection restriction for each of the call control devices in a storage unit, and congestion occurs in the telephone network, and the call control device is transferred from the congestion control device to the call control device. Before instructing the connection restriction to at least one of the call control devices when the call control apparatus instructing the connection restriction is selected as a control point of the connection restriction by changing the network configuration of the telephone network. The telephone number band that was accommodated in any area under the relay device or that was accommodated in any call control device other than the call control device for which the connection restriction was instructed was handled In this case, the congestion control device is recorded in the storage unit from among the control targets that are subject to connection control of the control point, which is newly included due to the network configuration change. A control target as a result of excluding the control target that has instructed connection restriction to the call control device is specified, and additional call control is instructed to the call control device.

  As a result, the network configuration is changed while congestion is occurring in the telephone network and the connection is regulated, and the connection path between the call control device and the relay device is changed, and the telephone that the call control device is responsible for Even when the number band is changed, it is possible to appropriately instruct connection restriction to additional control objects other than the control objects already instructed to the respective call control devices.

  In addition, another congestion control method of the present invention includes a plurality of call control devices that control call origination and reception of calls belonging to a predetermined telephone number band, and two or more call relay connections between the call control devices. A congestion control method using a congestion control device that designates a control target and instructs connection restriction to the call control device in order to eliminate congestion occurring in a telephone network including a relay device, the congestion control method The apparatus performs at least one of a change of the relay apparatus in which the call control apparatus is accommodated and a change in which the call control apparatus is in charge of a telephone number band of any call control apparatus other than the call control apparatus. Including a network configuration change pattern of the telephone network including the storage network, and when congestion occurs in the telephone network, the congestion control device instructs the connection control to at least one of the call control devices. When When the network configuration change of the telephone network is performed, the congestion control device is configured so that the network configuration change performed for the call control device instructing the connection restriction is stored in the storage unit. When at least one of the configuration change patterns is applicable, no additional connection restriction is instructed to the call control device.

  As a result, even when a network configuration change is performed while congestion occurs in the telephone network and connection restriction is being performed, it is possible to suppress the issuance of overlapping connection restrictions by a relatively simple process. .

  In addition, another congestion control method of the present invention includes a plurality of call control devices that control call origination and reception of calls belonging to a predetermined telephone number band, and two or more call relay connections between the call control devices. A congestion control method using a congestion control device that designates a control target and instructs connection restriction to the call control device in order to eliminate congestion occurring in a telephone network including a relay device, the congestion control method The apparatus performs at least one of a change of the relay apparatus in which the call control apparatus is accommodated and a change in which the call control apparatus is in charge of a telephone number band of any call control apparatus other than the call control apparatus. Including at least one type of network configuration change pattern of the telephone network in the storage unit, and recording a control target instructing the connection restriction for each of the call control devices in the storage unit. convergence When the congestion control device has instructed the connection restriction to at least one of the call control devices, the call control device instructing the connection restriction by changing a network configuration of the telephone network , Accommodated in any subordinate area of the relay device selected as the connection restriction control point, or accommodated by any call control device other than the call control device for which the connection restriction is instructed In the case where the telephone number band that has been handled is to be handled, the congestion control device is configured such that the network configuration change made for the call control device that has instructed the connection restriction is stored in the storage unit. When none of the configuration change patterns is applicable, the call control device is newly included by the network configuration change. Specify the control target as a result of excluding the control target instructing connection control to the call control device recorded in the storage unit from among the control targets that are subject to connection control of the control point. And instructing the call control device to perform additional connection restrictions.

  As a result, when a network configuration change is performed while congestion is occurring in the telephone network and connection control is being performed, additional control targets other than the control targets already instructed to each call control device are added. The connection restriction instruction can be performed more quickly.

  The congestion control apparatus according to the present invention includes the storage unit and a duplicate instruction avoiding unit that executes the congestion control method.

  A program according to the present invention causes a computer to function as the congestion control device.

  According to the present invention, even when the network configuration is changed while congestion occurs in the telephone network and connection restriction is being performed, a connection restriction instruction to the same control object is given to the same node. It is possible to provide a congestion control method, a congestion control device, and a program that prevent duplicate notification.

It is a structural example of the network which concerns on embodiment of this invention. It is a block diagram which shows the function structural example of the congestion control apparatus and call control server which concern on this invention. It is an example of occurrence of congestion before a network configuration change. It is explanatory drawing about the congestion control process when the congestion shown in FIG. 3 generate | occur | produces. It is a data structure and data example of a network configuration table. It is a data structure and data example of a regulation instruction information table. It is a data structure and data example of an issued regulation content table. It is explanatory drawing about the problem by which the overlapping connection control instruction | indication is issued. 12 is a flowchart showing a flow of duplication instruction avoidance processing according to method 1. 12 is a flowchart showing a flow of duplication instruction avoidance processing according to method 2. 12 is a flowchart showing a flow of duplication instruction avoidance processing according to method 3.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the drawings as appropriate.

  FIG. 1 is a configuration example of a network according to an embodiment of the present invention. As illustrated in FIG. 1, the network according to the embodiment of the present invention includes a congestion control device 1, a relay server 2, a call control server 3, a terminal 4, and a relay network 5.

  The call control server 3 accommodates a terminal 4 such as a telephone having a telephone number belonging to the same telephone number band (which often corresponds to a station number, but may be further subdivided), and the plurality of terminals 4 Controls outgoing and incoming calls in the area formed by. In the example of FIG. 1, call control server # 1 (3-1) is area 1 (A1), call control server # 2 (3-2) is area 2 (A2), and call control server # 3 (3- 3) controls area 3 (A3), and call control server # 4 (3-4) controls area 4 (A4).

  The relay server 2 accommodates a plurality of call control servers 3, relay connection of calls between the call control servers 3 accommodated by itself, and the call control server 3 accommodated by itself and other relays It manages call relay connection with the call control server 3 accommodated in the server 2 via the relay network 5. In the example of FIG. 1, relay server # 1 (2-1) accommodates call control server # 1 (3-1) and call control server # 2 (3-2), and relay server # 2 (2- 2) accommodates call control server # 3 (3-3) and call control server # 4 (3-4). Therefore, the relay server # 1 (2-1) manages the relay connection of the call of the area 5 (A5) connecting the area 1 (A1) and the area 2 (A2), and the relay server # 2 (2-2) It will be responsible for relay connection of call in area 6 (A6) connecting area 3 (A3) and area 4 (A4).

  The congestion control device 1 has information such as the processing capacity of each server constituting the telephone network and the traffic capacity of each communication path connecting the servers, and when congestion occurs in the telephone network. The traffic is distributed to each server and each communication path based on the current traffic situation and the expected traffic volume in the future, and congestion is controlled by instructing each server to regulate the connection according to the distribution result. Control to eliminate.

  FIG. 2 is a block diagram illustrating a functional configuration example of the congestion control device and the call control server according to the present invention. As illustrated in FIG. 2, the congestion control device 1 includes a processing unit 10 and a storage unit 20. The processing unit 10 transmits a control point setting unit 11 that determines the contents of connection restriction in each part in the network, and the determined connection restriction contents to each part selected as a control point via a communication interface unit (not shown). And a connection restriction instruction unit 14 that performs the above-described operation. The control point setting unit 11 includes a regulation calculation unit 12 that distributes traffic to each server and each communication path based on the current traffic situation and traffic volume expected in the future, and a network configuration change. And a network configuration change response unit 13 that determines the contents of additional connection restrictions to be issued. These units are executed by a CPU (Central Processing Unit) (not shown) of the congestion control device 1 configured by a computer by loading a predetermined program stored in a storage unit (not shown) into a main memory (not shown) and executing it. Is embodied by.

  The storage unit 20 includes a network configuration table 21, a restriction instruction information table 22, and an issued restriction content table 23. In the network configuration table 21, the latest network configuration information about the telephone network to be controlled is registered. Details of the network configuration table 21 will be described later with reference to FIG. In the restriction instruction information table 22, the contents of the connection restriction determined by the restriction calculation unit 12 are registered. Details of the restriction instruction information table 22 will be described later with reference to FIG. In the issued restriction content table 23, the issued restriction content instructed to each call control server 3 from the connection restriction instruction unit 14 is registered. Details of the issued restriction content table 23 will be described later with reference to FIG.

  In FIG. 2, the call control server 3B shows a main configuration when the call control server 3 detects the congestion of its own device and functions as a congestion call control server. Further, the call control server 3C shows a main configuration when the call control server 3 functions as a restriction target call control server instructed to restrict connection. That is, since the call control server 3 becomes a congestion call control server or a restriction target call control server depending on circumstances, the call control server 3B (congestion call control server) and the call control server 3C (restriction target call control server). And both configurations. Therefore, the connection request processing unit 31 included in the call control server 3 includes the congestion detection unit 32, the incoming call restriction request unit 35, and the outgoing call restriction unit 36. The congestion detection unit 32 further includes a CPU usage rate measurement unit 33 and a connection number measurement unit 34. These units are embodied by a CPU (not shown) of the call control server 3 configured by a computer loading a predetermined program stored in a storage unit (not shown) into a main memory (not shown) and executing it. .

  The connection request processing unit 31 receives a connection request for a call transmitted from the terminal 4 in the subordinate area accommodated by the call control server 3 and performs necessary outgoing call processing. In addition, the connection request processing unit 31 receives the call to the terminal 4 in the subordinate area. It accepts incoming call connection requests and performs necessary incoming call processing.

  The congestion detection unit 32 of the call control server 3B (congestion call control server) monitors the CPU usage rate of its own device, the number of call connections, etc., and congestion occurs when those values exceed a predetermined value Is determined. The CPU usage rate measuring unit 33 measures the CPU usage rate of its own device, and the connection number measuring unit 34 measures the number of call connections of its own device. When the congestion detection unit 32 determines that congestion has occurred in its own device, the incoming call restriction request unit 35 sends its own call control server to the congestion control device 1 via a communication interface unit (not shown). Requests that incoming calls to 3B (congestion call control server) be restricted. In this incoming call restriction request, the number of incoming restricted calls per unit time may be specified, or the call loss rate of incoming calls may be specified. Alternatively, the relative reduction rate of the total incoming call volume may be designated.

  When the congestion control device 1 receives an incoming call restriction request from the call control server 3B (congestion call control server), the congestion control device 1 searches for a node or relay route with a large number of outgoing calls to the telephone number band accommodated by the call control server 3B. To determine the necessary connection restrictions (such as outgoing call restrictions, outgoing connection route restrictions (including restrictions on multiple outgoing and outgoing route groups)) related to the telephone number band, and the contents of the determined connection restrictions. To each call control server 3C (restriction target call control server) to be regulated.

  The call restriction unit 36 of each call control server 3C instructed to restrict the connection from the congestion control device 1 is transmitted from the terminal 4 in the subordinate area to the restricted telephone number band according to the instruction from the congestion control device 1. Restricting outgoing calls to the ground or restricting outgoing / outgoing routes that cause some or all of the calls to be lost. For calls that have been lost due to restrictions on outgoing calls to the ground or outgoing connection routes, the connection request processing unit 31 outputs a busy tone or a voice announcement to the effect that connection is impossible.

  Next, a problem of duplicate connection restriction issuance that occurs when a network configuration change is performed during connection restriction will be described using a specific example. Here, in the telephone network shown in FIG. 3, calls made from the area 2 (A2) and the area 6 (A6) and destined for the terminal in the area 7 (A7) whose telephone number band is “43211” are short-time. It is assumed that congestion has occurred in the call control server # 5 (3-5) by concentrating on the network.

  FIG. 4 is an explanatory diagram of the congestion control process when the congestion shown in FIG. 3 occurs. As shown in FIG. 4, the call control server # 5 (3-5) that has detected congestion designates, for example, an incoming call volume that can be accepted by the congestion control apparatus 1 in step S1, and receives area 7 (A7) ( An incoming call restriction request to the telephone number band: 43211) is transmitted. The congestion control device 1 monitors the traffic of each part in the telephone network, and upon receiving this incoming call restriction request, the control point setting unit 11 (FIG. 2) receives an incoming call to area 7 (A7) in step S2. By searching for a node or a relay route having a large amount, a control point (for example, a call control server or an area) that performs connection restriction is appropriately selected, and a connection restriction amount of each control point is determined. Here, the call control server # 2 (3-2) and the relay server # 2 (2-2), which are nodes having a large outgoing call volume addressed to the terminal in the area 7 (A7), are controlled by the restriction calculation unit 12 (FIG. 2). ) Is selected as a control point for connection restriction, and the contents of the restriction instruction as illustrated in FIG. 6 are registered in the restriction instruction information table 22.

  As shown in FIG. 6, in the restriction instruction information table 22, a record having a restriction instruction ID (Identification: identifier), a connection restriction control target, a restriction target, and a connection restriction amount as attributes is included in the determined restriction instruction. Only the number is registered. In addition, when it becomes necessary to update the contents of the regulation instruction as time passes, the regulation calculation unit 12 updates the data of the corresponding record, and when the regulation instruction is released, the corresponding record is deleted. . That is, the contents of all the restriction instructions that are currently valid are recorded in the restriction instruction information table 22.

  The restriction instruction ID is an identifier given by the restriction calculation unit 12 in order to uniquely identify each restriction instruction. The control target of the connection restriction is a telephone number band, an outgoing connection route, or the like that is subject to connection restriction. In the restriction target, a node name (call control server name or relay server name) or area name that is a control point for instructing connection restriction is registered. In the connection restriction amount, data of the connection restriction amount determined by the restriction calculation unit 12 is registered.

  As illustrated in FIG. 6, here, the amount of restriction on connection to the telephone number band “43211” for which incoming call restriction is requested from the call control server # 5 (3-5) where congestion has occurred is the call control server # 2. It is assumed that (3-2) is determined to be 10% and area 6 is determined to be 50%. Then, the congestion control device 1 transmits a restriction instruction 1 for restricting connection from the call control server # 2 to the call control server # 2 (3-2) in step S3. In step S4, call control server # 3 accommodated in area 6 (A6) with reference to network configuration table 21 illustrated in FIG. 5 for restriction instruction 2 for restricting connection from area 6 (A6). (3-3) and the call control server # 4 (3-4).

  FIG. 5 is a data example of the network configuration table 21 corresponding to the telephone network shown in FIG. As shown in FIG. 5, in the network configuration table 21, records having as attributes the call control server, the area to be accommodated, the telephone number band, the relay server of the accommodation destination, and the area to be accommodated constitute the telephone network. The number of registered call control servers 3 is registered. Further, when the network configuration is changed, the network configuration change handling unit 13 sequentially updates based on network configuration change information transmitted from a network configuration management server (not shown).

  In the call control server of the network configuration table 21, the call control server name of each call control server 3 constituting the telephone network is registered. In the area to be accommodated, the area name including the terminal accommodated by the call control server 3 is registered, and in the telephone number band, the telephone number band accommodated by the call control server 3 is registered. The relay server name of the relay server 2 in which the call control server 3 is accommodated is registered in the accommodating relay server. In the area accommodated, the area name of the area accommodated by the relay server 2 in which the call control server 3 is accommodated is registered.

  For example, the first record in the data example shown in FIG. 5 indicates that the call control server # 1 (3-1) accommodating the area 1 whose telephone number band is “XXXX” is the relay server # 1 (2- By being accommodated in 1), it is being accommodated in area 5. On the other hand, by referring to the third and fourth records in FIG. 5, the call control server # 3 (3-3) and the call control server # 4 (3-4) are included in the restricted area 6 (A6). Therefore, the connection restriction instruction unit 14 (FIG. 2) of the congestion control device 1 sends a restriction instruction 2 for restricting connection from the area 6 (A6) to the call control server #. 3 (3-3) and the call control server # 4 (3-4). Further, as illustrated in FIG. 7, the connection restriction instruction unit 14 registers the content of the transmitted restriction instruction in the issued restriction content table 23 in units of the call control server 3.

  As a result, as indicated by the broken line arrow in FIG. 8, the restriction instruction 1 for instructing connection restriction from the congestion control device 1 to the telephone number band “43211” is also restricted to the call control server # 2 (3-2). The instruction 2 is transmitted to the call control server # 3 (3-3) and the call control server # 4 (3-4), and connection restriction is started by the respective outgoing call restriction units 36 (FIG. 2).

  Here, the network configuration is changed, and as shown in FIG. 8, the relay server at the accommodation destination of the call control server # 2 (3-2) relays from the previous relay server # 1 (2-1). It is assumed that the server # 2 (2-2) has been changed. Such a network configuration change includes, for example, a plurality of call control servers 3 and relay servers 2 that accommodate different areas in a single building. This is done, for example, when changing the connection route between servers in order to update the device. In addition, in an IP telephone network in which a large-capacity server is used, such a change in the accommodation configuration is sufficiently assumed. Even in a public telephone network in which an exchange having a relatively small capacity is used, the prefectural borders, etc. It is thought that it can occur in

  As a result, the area accommodated corresponding to the relay server in which the call control server # 2 (3-2) is accommodated is changed from the previous area 5 (A5) (see FIG. 3) to area 6 (A6a). Will be. At this time, in the conventional congestion control method, it is necessary to transmit the restriction instruction 2 for the area 6 (A6a) to the call control server # 2 (3-2) newly added to the area 6 (A6a). Judging, as indicated by the one-dot chain arrow in FIG. 8, the restriction instruction 2 for instructing the call control server # 2 (3-2) 50% connection restriction to the telephone number band “43211”, The transmission is duplicated with the restriction instruction 1 (connection restriction amount: 10%).

  Similarly, when the telephone number band accommodated in the call control server # 2 (3-2) is accommodated in the call control server # 3 (3-3), for example, The restriction instruction 1 transmitted to the control server # 2 (3-2) will be transmitted to the call control server # 3 (3-3), and a duplicate restriction instruction will also be transmitted.

  On the other hand, in the congestion control method according to the present embodiment, when the network configuration is changed, the network configuration change handling unit 13 included in the congestion control device 1 gives such a duplicate regulation instruction to the same call control server 3. (Duplicate instruction) should not be sent. There are three methods shown in FIG. 9, FIG. 10, and FIG.

  The duplicate instruction avoidance process of Method 1 shown in FIG. 9 avoids the duplicate instruction by comparing all the restriction instructions being applied with the restriction instructions that need to be added when the network configuration is changed. .

  As shown in FIG. 9, in the duplicate instruction avoidance process according to method 1, the network configuration change handling unit 13 first determines whether or not a restriction instruction is being issued in step S61, and if it is not in the restriction instruction (No in step S61). ) The process proceeds to step S65 to update the network configuration table 21, and the process ends.

  If a restriction instruction is being issued (Yes in step S61), the process proceeds to step S62, and the additional restriction contents necessary for the network configuration change are calculated with reference to the restriction instruction information table 22 (FIG. 6). For example, when the accommodation destination of the call control server # 2 (3-2) described with reference to FIG. 8 is changed, the restriction instruction 2 is given to the area 6 (A6a) which is the new accommodation destination area of the server. Is registered in the restriction instruction information table 22, issuing the restriction instruction 2 to the call control server # 2 (3-2) is calculated as additional restriction contents.

  Next, in step S63, the network configuration change handling unit 13 refers to the issued restriction content for each call control server 3 recorded in the issued restriction content table 23 (FIG. 7), and first From the calculated additional restriction content, the restriction content that causes overlapping of the control object with the issued restriction content is deleted. In the example of FIG. 8, the restriction instruction 2 that is the additional restriction content calculated for the call control server # 2 (3-2) is the restriction instruction 1 issued to the server (the contents of the first record in FIG. 7). The control instruction number 2 is deleted from the content of the additional restriction.

  As a result, if any additional restriction content remains, in the next step S64, the network configuration change handling unit 13 sends the additional restriction content to the connection control instruction unit 14 as a target call control server 3C (restriction target call control). After instructing the server (FIG. 2), the network configuration table 21 is updated in step S65, and the process is terminated.

  According to the duplication instruction avoidance processing of method 1, only issue of duplicate instructions in units of individual call control servers 3 is suppressed at the time of network configuration change, so congestion that improves adaptability to network configuration change. Control can be realized.

  The duplication instruction avoidance process by the method 2 shown in FIG. 10 suppresses the issuance of additional regulation instructions accompanying any change in network configuration that may cause a duplicate instruction to be issued. Is.

  As shown in FIG. 10, in the duplicate instruction avoidance process according to the method 2, the network configuration change handling unit 13 first determines whether or not a restriction instruction is being issued in step S71, and if not (No in step S71). ) The process proceeds to step S76, the network configuration table 21 is updated, and the process ends.

  If a restriction instruction is being issued (Yes in step S71), the process proceeds to step S72 to check whether the network configuration change corresponds to one of the predetermined overlapping patterns. This duplication pattern indicates all configuration change patterns in which duplication instructions may be issued when an additional restriction content required in accordance with a network configuration change is instructed. This overlapping pattern is registered in advance in the storage unit 20 (not shown). The overlapping pattern includes, for example, a pattern in which the relay server 2 that is the accommodation destination of a certain call control server 3 is changed, a pattern in which the connection route between the relay servers 2 is changed, and the call control server as described in FIG. 3 includes a pattern in which the telephone number band accommodated by 3 is changed. The network configuration change handling unit 13 checks whether the configuration change pattern included in the network configuration change information transmitted from the network configuration management server (not shown) corresponds to any one of these overlapping patterns.

  Next, in step S73, the network configuration change handling unit 13 determines the check result in step S72. If any of the registered overlapping patterns is satisfied (“corresponds” in step S73), step S76. If the process does not correspond to any overlapping pattern (“not applicable” in step S73), the process proceeds to step S74. The pattern in which the accommodation destination of the call control server # 2 (3-2) described in FIG. 8 is changed from the relay server # 1 (2-1) to the relay server # 2 (2-2) is a registered overlapping pattern. Therefore, the process proceeds to step S76 and no additional restriction instruction is given.

  If none of the overlapping patterns correspond, next, in step S74, the network configuration change handling unit 13 calculates the additional restriction content necessary for the network configuration change, and in step S75, the connection restriction is calculated. After instructing the target call control server 3C (restriction target call control server) (FIG. 2) to the additional restriction content calculated by the instruction unit 14, the network configuration table 21 is updated in step S76, and the process ends.

  According to the duplicate instruction avoidance process of Method 2, it is possible to suppress the issuance of duplicate regulation instructions by a relatively simple process regardless of the scale of the network.

  The duplication instruction avoidance process by the method 3 shown in FIG. 11 is a combination of the method 1 and the method 2 described above. That is, in the process of the method 2 shown in FIG. 10, the process when it corresponds to the overlapping pattern (the process after step S85 corresponding to the “corresponding” side of step S73) is the process after step S62 of the method 1. Similar processing is performed. Although detailed description of the operation is omitted, according to the duplicate instruction avoidance process of Method 3, the number of cases where the function equivalent to Method 1 can be realized with a smaller processing amount than Method 1 increases, and the processing speed is increased accordingly. Is possible.

  As another method for avoiding the issuance of duplicate instructions, the content of the configuration change to be implemented is notified to the congestion control device 1 prior to the implementation of the network configuration change, and has been issued by the same processing as described above. If it is determined that there is a possibility that multiple regulatory instructions may overlap (for example, when the definition of an area is changed, the original two different areas may be changed to one same area. The network configuration change may be stopped.

  Although description of the form for implementing this invention is finished above, the aspect of this invention is not restricted to this, A various change is possible within the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Congestion control apparatus 10 Processing part 11 Control point setting part 12 Restriction calculating part 13 Network configuration change response part (duplication instruction | indication avoiding means)
DESCRIPTION OF SYMBOLS 14 Connection control instruction | indication part 20 Memory | storage part 21 Network configuration table 22 Restriction instruction | indication information table 23 Issued control content table 2, 2-1 to 2-3 Relay server (relay apparatus)
3, 3B, 3C, 3-1 to 3-5 Call control server (call control device)
31 Connection Request Processing Unit 32 Congestion Detection Unit 33 CPU Usage Rate Measurement Unit 34 Connection Number Measurement Unit 35 Incoming Call Restriction Request Unit 36 Outgoing Restriction Unit 4 Terminal 5 Relay Network A1 to A7 Area

Claims (7)

Congestion occurring in a telephone network comprising a plurality of call control devices that control the outgoing and incoming calls of each belonging to a predetermined telephone number band, and two or more relay devices that perform call relay connection between the call control devices In order to solve the problem, a congestion control method using a congestion control device that designates a control target to the call control device and instructs connection restriction,
The congestion control device records a control target instructing the connection restriction for each of the call control devices in a storage unit,
When congestion occurs in the telephone network and the connection control is instructed to at least one of the call control devices from the congestion control device, the connection control is performed by changing the network configuration of the telephone network. The instructed call control device is accommodated in any subordinate area of the relay device selected as the connection restriction control point, or any other than the call control device for which the connection restriction is instructed In the case where the telephone number band accommodated by the call control device is handled,
The congestion control device includes the call control recorded in the storage unit from among the control targets that are subject to connection control of the control point, the call control device being newly included due to the network configuration change. A congestion control method comprising: designating a control target as a result of excluding the control target instructing connection restriction to a device and instructing the call control device to perform additional connection restriction. Congestion occurring in a telephone network comprising a plurality of call control devices that control the outgoing and incoming calls of each belonging to a predetermined telephone number band, and two or more relay devices that perform call relay connection between the call control devices In order to solve the problem, a congestion control method using a congestion control device that designates a control target to the call control device and instructs connection restriction,
The congestion control device includes a change of the relay device in which the call control device is accommodated, and a change in which the call control device is responsible for a telephone number band of any call control device other than the call control device. Holding a network configuration change pattern of the telephone network including at least 1 in a storage unit;
When the network configuration of the telephone network is changed when congestion occurs in the telephone network and the connection control is instructed from the congestion control device to at least one of the call control devices. ,
When the network configuration change performed for the call control device that has instructed the connection restriction corresponds to at least one of the network configuration change patterns held in the storage unit, the congestion control device A congestion control method characterized by not instructing a call control apparatus to perform additional connection restriction. Congestion occurring in a telephone network comprising a plurality of call control devices that control the outgoing and incoming calls of each belonging to a predetermined telephone number band, and two or more relay devices that perform call relay connection between the call control devices In order to solve the problem, a congestion control method using a congestion control device that designates a control target to the call control device and instructs connection restriction,
The congestion control device includes a change of the relay device in which the call control device is accommodated, and a change in which the call control device is responsible for a telephone number band of any call control device other than the call control device. The network configuration change pattern of the telephone network including at least 1 is held in the storage unit, and the control target instructing the connection restriction for each of the call control devices is recorded in the storage unit,
When congestion occurs in the telephone network and the connection control is instructed to at least one of the call control devices from the congestion control device, the connection control is performed by changing the network configuration of the telephone network. The instructed call control device is accommodated in any subordinate area of the relay device selected as the connection restriction control point, or any other than the call control device for which the connection restriction is instructed In the case where the telephone number band accommodated by the call control device is handled,
The congestion control device, when the network configuration change performed for the call control device that has instructed the connection regulation does not correspond to any of the network configuration change patterns held in the storage unit, Instructing connection restriction to the call control device recorded in the storage unit from among the control targets that are subject to connection restriction of the control point that newly includes the call control device due to a network configuration change A congestion control method comprising: designating a control target as a result of excluding the control target and instructing the call control device to perform additional connection restriction. Congestion occurring in a telephone network comprising a plurality of call control devices that control the outgoing and incoming calls of each belonging to a predetermined telephone number band, and two or more relay devices that perform call relay connection between the call control devices In order to solve the problem, the call control device is a congestion control device that designates a control target and instructs connection restriction,
A storage unit for recording a control target instructing the connection restriction for each of the call control devices;
When congestion occurs in the telephone network and the connection control is instructed to at least one of the call control devices from the congestion control device, the connection control is performed by changing the network configuration of the telephone network. The instructed call control device is accommodated in any subordinate area of the relay device selected as the connection restriction control point, or any other than the call control device for which the connection restriction is instructed In the case where the telephone number band accommodated by the call control device is handled,
The connection restriction to the call control device recorded in the storage unit is controlled from among the control objects to be subject to the connection restriction of the control point where the call control device is newly included due to the network configuration change. A congestion control apparatus comprising: a duplicate instruction avoiding unit that designates a control object as a result of excluding the instructed control object and instructs the call control apparatus to perform additional connection restriction. Congestion occurring in a telephone network comprising a plurality of call control devices that control the outgoing and incoming calls of each belonging to a predetermined telephone number band, and two or more relay devices that perform call relay connection between the call control devices In order to solve the problem, the call control device is a congestion control device that designates a control target and instructs connection restriction,
The telephone including at least one of a change of the relay device in which the call control device is accommodated and a change in which the call control device is responsible for a telephone number band of any call control device other than the call control device A storage unit for holding a network configuration change pattern of the network;
When the network configuration of the telephone network is changed when congestion occurs in the telephone network and the connection control is instructed from the congestion control device to at least one of the call control devices. ,
When the network configuration change performed for the call control device that has instructed the connection restriction corresponds to at least one of the network configuration change patterns held in the storage unit, an additional information is added to the call control device. A congestion control apparatus comprising: a duplicate instruction avoiding unit that does not instruct connection restriction. Congestion occurring in a telephone network comprising a plurality of call control devices that control the outgoing and incoming calls of each belonging to a predetermined telephone number band, and two or more relay devices that perform call relay connection between the call control devices In order to solve the problem, the call control device is a congestion control device that designates a control target and instructs connection restriction,
The telephone including at least one of a change of the relay device in which the call control device is accommodated and a change in which the call control device is responsible for a telephone number band of any call control device other than the call control device A storage unit that stores at least one type of network configuration change pattern of the network, and that records a control target instructing the connection restriction for each of the call control devices;
When congestion occurs in the telephone network and the connection control is instructed to at least one of the call control devices from the congestion control device, the connection control is performed by changing the network configuration of the telephone network. The instructed call control device is accommodated in any subordinate area of the relay device selected as the connection restriction control point, or any other than the call control device for which the connection restriction is instructed In the case where the telephone number band accommodated by the call control device is handled,
When the network configuration change made for the call control device that has instructed the connection restriction does not correspond to any of the network configuration change patterns held in the storage unit, the network configuration change causes the call to change. The control target that is instructed to restrict connection to the call control device recorded in the storage unit is excluded from the control targets that are subject to connection control of the control point that newly includes the control device. A congestion control device comprising: a duplicate instruction avoiding unit that designates a control target as a result of this and instructs the call control device to perform additional connection restriction.   The program for functioning a computer as a congestion control apparatus as described in any one of Claims 4-6.

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