JP4143766B2 - Congestion control device, congestion control method and program - Google Patents

Description

  The present invention relates to a congestion control technique for an application that sets up a session including at least a telephone in an IP network including a gateway, and is particularly suitable for efficiently controlling congestion inside the network accompanying an improvement in processing capacity of the gateway. The present invention relates to a new congestion control technology.

  Currently, IP telephone technology for making a call by connecting a gateway between an IP network and a public switched telephone network is available, and congestion control in such a network configuration is required. Regarding such congestion control, first, a congestion control technique in a conventional public switched telephone network will be described.

  In order to explain the congestion control technique in this public telephone exchange network, the network configuration of the circuit switching network adopted by the public telephone exchange network will be described.

  The network configuration of the public telephone exchange network is associated with a region and further has a hierarchical structure. The association with a region means that the subscribers accommodated in a certain subscriber line switch are all the subscribers in a certain region. The network configuration has a hierarchical structure in which subscribers are accommodated in subscriber line exchanges, and the subscriber line exchanges are accommodated in higher order exchanges.

  This is also reflected in the configuration of the telephone number, and the area can be specified by the telephone number. Based on this number, each exchange finally determines which destination exchange it should connect to, and connects the session to the next stage to finally establish the session.

  Centralized management is suitable for the control of a network having such characteristics. This is because, since a hierarchical structure is used, in order to apply control in a larger range, it is only necessary to perform control in a higher hierarchy.

  For this reason, the congestion control technology in the public switched telephone network is centrally managed as described in Non-Patent Document 1, Non-Patent Document 2, and Non-Patent Document 3. When each switch detects congestion, the centralized management is performed. The system notifies the system, determines the amount of regulation in each switch on the central management system side, and notifies each switch.

  Congestion between the local network and other networks in the public telephone exchange network is also done by a centralized management system. Some are controlled manually.

Shimogaki, Kobayashi, Togawa: Operation system to prevent telephone network congestion-Advanced traffic control system (TCS-V2), NTT Technical Journal, 1-8 (1989), p. 61-65 Shimogaki, Hasegawa: Enhancement of traffic control system (TCS-V2) functions, NTT Technical Journal, 3-2 (1991), p. 40-43 Information and Communication Technology Handbook Editorial Committee, Information and Communication Technology Handbook, Ohmsha (1987), p. 87-89

  The problems of the prior art to be solved are as follows. The gateway in the public telephone exchange network mediates between the telephone networks, but the IP telephone network is a gateway between the IP network and the public telephone exchange network, and there is a need for protocol conversion. For this reason, it is assumed that the CPU processing capacity of the gateway itself is set higher than that of the gateway in the public switched telephone network.

  When the CPU processing capability of the gateway is high, the gateway itself is insufficient in processing capability and is less likely to cause congestion. However, when congestion occurs, the number of sessions that fail to establish a session connection increases due to the high CPU processing capacity of the gateway, which places an extra load on the public switched telephone network and IP network. There is a problem that this extra load causes congestion within the public telephone exchange network and the IP network.

  Furthermore, since there is no centralized management system in the IP network, the gateway cannot be controlled by the centralized management system unlike the public switched telephone network.

  An object of the present invention is to efficiently perform congestion control of an application for setting a session in a network with a gateway.

  In order to achieve the above object, the present invention pays attention to an incoming session to a certain number or address in the gateway, and measures a non-completion rate (or completion rate) to this incoming number or address. To regulate session connection requests. Furthermore, the non-completion rate (or completion rate) is measured for the session after passing through the gateway, and the restriction at the gateway is made so that this non-completion rate (or completion rate) is between a predetermined upper limit and lower limit. By applying, we will stabilize regulation during congestion and release loose regulation.

  According to the present invention, at the time of congestion, it is possible to regulate session requests at the gateway, thereby preventing an unnecessary load from being applied to each network to which the gateway is connected. Further, it is possible to realize control stability at the time of congestion such that congestion that has been settled due to deregulation occurs again and is regulated again.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 is a block diagram showing a configuration example of a congestion control apparatus according to the present invention, FIG. 2 is a block diagram showing a hardware configuration example of the congestion control apparatus in FIG. 1, and FIG. 3 is a congestion control in FIG. FIG. 4 is a block diagram showing a configuration example of a network provided with a congestion control apparatus according to the present invention.

  In FIG. 2, 21 is a display device such as a CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display), 22 is an input device such as a keyboard or mouse, and 23 is an external storage device such as an HDD (Hard Disk Drive). , 24 is an information processing apparatus that includes a CPU (Central Processing Unit) 24a, a main memory 24b, an input / output interface 24c, and the like, and performs computer processing. 25 is a CD-ROM (Compact Disc) in which programs and data according to the present invention are recorded. -An optical disc made up of Read Only Memory (DVD) or DVD (Digital Video Disc / Digital Versatile Disc), 26 is a drive device for reading programs and data recorded on the optical disc 25, 27 is a LAN (Local Area Network) card or modem And the like.

  After the program and data stored in the optical disk 25 are installed in the external storage device 23 by the information processing device 24 via the drive device 26, they are read from the external storage device 23 into the main memory 24b and processed by the CPU 24a. Each function of the congestion control device shown in FIG.

  As shown in FIG. 1, the congestion control apparatus includes an incomplete session detection unit 1 and an incomplete rate measuring unit 2 as the first means of the present invention, and a second incomplete rate as the second means of the present invention. Consists of a measurement unit 3, a first incompletion rate measurement unit 4, a regulation control unit 5, and a regulation execution / cancellation unit 6, and controls congestion caused by setting of a session including at least a telephone between networks, For all sessions passing through the gateway connecting the networks, the incompleteness of the session is monitored and measured in the identification information unit of the receiving terminal, and the result is stored in the storage device as incomplete information. The incomplete information is read from the storage device, and based on the incomplete information, the session setting request to the destination terminal in the gateway is regulated.

  In this example, for simplicity of explanation, consider a state / situation in which calls are concentrated on several terminals of the network B 41b from the network A 41a through the gateway 42 in FIG. The congestion control processing operation shown in FIG. 3 by the congestion control device 40 having the configuration shown in FIG. 1 will be described.

  The incomplete session detection unit 1 detects an incomplete session (step 101). That is, it is detected whether there is a session in the gateway 42 in which the connection request session to the network B 41b is incomplete. This incomplete session is always detected.

  When the incomplete session detection unit 1 detects an incomplete session, the incomplete rate measurement unit 3 adds the incoming number (address) of the detected incomplete session to the incomplete rate measurement list registered in advance in the storage device ( Step 102) For each incoming call number (address), the incomplete rate, that is, the ratio of the number of incomplete sessions to the number of connection request sessions is counted (step 103). This counting is continued unless otherwise specified.

  The restriction control unit 5 determines whether or not the incompletion rate for each incoming number (address) counted by the incompletion rate measurement unit 3 exceeds the threshold value R0 (step 104), and the incompletion rate exceeds the threshold value R0. If not, it is next determined whether or not the incomplete rate is equal to or less than a threshold value R1 (<R0) (step 105).

  If the non-completion rate is not less than or equal to the threshold value R1, it is determined whether or not the non-completion rate exceeds the threshold value R0. If the incomplete rate is equal to or less than the threshold value R1, the corresponding incoming call number (address) is removed from the incomplete rate measurement list in the incomplete rate measuring unit 2 (step 106).

  If it is determined in step 104 that the non-completion rate exceeds the threshold value R0, the restriction control unit 5 issues an instruction to the restriction execution / cancellation unit 6, and the restriction execution / cancellation unit 6 determines a predetermined restriction. Regulation by value is performed (step 107).

  The regulation method in step 107 is performed as follows. In response to a connection request for a predetermined number of times or a number of times determined from measurement, a session for the receiving terminal is restricted so that only one session passes through the gateway 42. Alternatively, after setting a predetermined number of times, a connection request for the number of times corrected by measurement is restricted so that only one session passes through the gateway 42. The same applies to the method of regulation in step 110 and step 112 described later.

  Simultaneously with the restriction instruction to the restriction execution / cancellation unit 6, the restriction control unit 5 issues an instruction to the second incomplete rate measuring unit 3, and the second incomplete rate measuring unit 3 performs the second incomplete rate. That is, the ratio of the number of incomplete sessions to the number of session requests to the network B 41b after passing through the gateway 42 is counted (step 108).

  Further, the restriction control unit 5 determines whether the second non-completion rate is equal to or higher than the upper limit RU2 (step 109), and if it is equal to or higher than RU2, the restriction control unit 5 issues an instruction to the restriction execution / release unit 6, The regulation execution / cancellation unit 6 strengthens and regulates the regulation value (step 110), and again determines whether or not the second incompletion rate is equal to or higher than the upper limit RU2 and repeats this.

  If the second non-completion rate is not equal to or higher than the upper limit RU2, the restriction control unit 5 determines whether the second non-completion rate is equal to or lower than the lower limit RL2 (step 111), and the second non-completion rate is equal to or lower than RL2. If so, the restriction control unit 5 determines whether the second incomplete rate is equal to or lower than the lower limit RL2 (step 111). If the second incomplete rate is equal to or lower than the lower limit RL2, the restriction control unit 5 executes the restriction. The cancellation unit 6 is instructed, and the regulation execution / cancellation unit 6 relaxes the regulation value (step 112), and again determines whether the second non-completion rate is equal to or lower than the lower limit RL2, and repeats this.

  When the second incompletion rate is not less than or equal to the lower limit RL2, the restriction control unit 5 sets the first incompletion rate, that is, the number of session requests that do not pass through the gateway 42 with respect to the number of session requests that are added to the gateway 42 from the network A 41a. It is determined whether the ratio is equal to or less than the restriction release threshold (step 113).

  If the first non-completion rate is not less than or equal to the restriction release threshold, the process returns to the determination process of step 109 again. If the first non-completion rate is less than or equal to the restriction release threshold, the restriction is released ( Step 114), the process returns to Step 104. Here, the first incomplete rate is obtained by the first incomplete rate measuring unit 4.

  Note that, in the method of restriction in the above-described steps 107, 110, and 112, the number of session connection requests when restricting only one session to pass through the gateway 42 is determined in advance by the second incomplete rate. Determine a value between the upper and lower limits.

  As described above with reference to FIGS. 1 to 4, in the congestion control technique of this example, in order to control congestion due to setting of a session including at least a telephone in the network, the gateway 42 that connects the networks is provided. It monitors all the sessions that pass through, acquires the incomplete result of the session to the terminal for each receiving terminal, stores it in the storage device, and reads out the incomplete result information of the session from this storage device. Based on the completion information, the session setting request to the receiving terminal is regulated.

  More specifically, it is determined whether or not the incomplete rate that is the ratio of the number of incomplete sessions to the number of connection request sessions exceeds a predetermined first threshold, and the incomplete rate exceeds the first threshold. In this case, for the session for the receiving terminal, the connection request for the predetermined number of times or the number of times obtained from the measurement, or after setting the predetermined number of times, it is corrected by the measurement. In response to the number of connection requests made, only one session is restricted to pass through the gateway 42.

  Further, a first incompletion rate is calculated as a ratio of the number of session requests not passing through the gateway 42 to the number of session requests applied to the gateway 42 from the network (41a), and the session request to the network (41b) passing through the gateway 42 is calculated. A second incompletion rate as a ratio of the number of incomplete sessions to the number is calculated, and the restriction is released based on the first and second incompletion rates.

  In addition, two thresholds, an upper limit and a lower limit, are provided for the second incomplete rate, and when the second incomplete rate falls below the lower limit, the regulation at the gateway 42 is relaxed, and the second incomplete rate is When the upper limit is exceeded, the regulation at the gateway 42 is strengthened.

  In addition, a restriction cancellation threshold value is provided as a lower limit threshold for the first incompletion rate, and when the restriction is canceled, if the first incompletion rate falls below the restriction cancellation threshold value, Release.

  Further, when restricting only one session to pass through the gateway 42, a second incomplete rate as a ratio of the number of incomplete sessions to the number of session requests to the network (41b) that has passed through the gateway 42 is calculated. The number of session connection requests for passing one session through the gateway 42 is determined so that the second incompletion rate is a value between a predetermined upper limit and lower limit.

  In this way, in this example, at the time of congestion, the session request is regulated at the gateway 42, thereby preventing unnecessary loads from being applied to the respective networks (41a, 41b) to which the gateway 42 is connected. Further, it is possible to realize control stability at the time of congestion such that congestion that has been settled due to deregulation occurs again and is regulated again.

  In addition, this invention is not limited to the example demonstrated using FIGS. 1-4, In the range which does not deviate from the summary, various changes are possible. For example, in this example, it is based on the incomplete rate, but it is easy to configure based on the complete rate.

  In this case, all sessions passing through the gateway 42 connecting the networks are monitored, and the completion result of the session to the terminal is acquired and stored in the storage device for each receiving terminal, and the session is completed from the storage device. The result information is read, and the session setting request to the receiving terminal is regulated based on the completion information.

  In this regulation, it is determined whether or not the completion rate, which is the ratio of the number of completed sessions to the number of connection request sessions, falls below a predetermined second threshold, and when the completion rate falls below the second threshold, Corrected by measurement after setting a predetermined number of times for a connection request for a predetermined number of times or the number of times determined from measurement for the session for the receiving terminal. In response to the number of connection requests, only one session is regulated to pass through the gateway device.

  Also, a first completion rate is calculated as a ratio of the number of session requests passing through the gateway 42 to the number of session requests applied from the network (41a) to the gateway 42, and the number of session requests to the network (41b) passing through the gateway 42 is calculated. The second completion rate is calculated as a ratio of the number of completed sessions with respect to, and the restriction is released based on these first and second completion rates.

  At this time, two threshold values, an upper limit and a lower limit, are set for the second completion rate, and if the second completion rate exceeds the upper limit, the restriction at the gateway 42 is relaxed, and the second completion rate falls below the lower limit. If it falls below, the regulation at the gateway 42 is strengthened.

  Alternatively, a restriction release threshold is set as an upper limit threshold for the first completion rate, and when the restriction is released, the restriction release at the gateway 42 is canceled if the first completion rate exceeds the restriction release threshold. I do.

  When restricting only one session to pass through the gateway 42, the second completion rate is calculated as a ratio of the number of completed sessions to the number of session requests to the network that has passed through the gateway 42. The number of session connection requests for passing one session through the gateway device is determined so that the completion rate of the session is a value between a predetermined upper limit and lower limit.

  In this example, for convenience of explanation, it is assumed that calls are concentrated from the network A 41a to terminals in the network B 41b. Conversely, when calls are concentrated from the network B 41b to terminals in the network A 41a. Is also feasible in the same way. Further, a case where calls are concentrated from a plurality of networks to terminals in the network B 41b can be similarly realized.

  Also, in this example, as a method of restriction in step 107 and steps 110 and 112, for the connection request for the predetermined number of times or the number of times obtained from the measurement for the session for the receiving terminal. Thus, only one session passes through the gateway 42 in response to the connection request for the number of times corrected by measurement after setting the predetermined number of times so that only one session passes the gateway 42 For example, for a session for the receiving terminal, for example, after setting a predetermined time interval or a time interval obtained from measurement, or a predetermined time interval, It is also possible to regulate that only one session passes through the gateway device at a time interval corrected by measurement. At this time, the time interval for restricting only one session to pass through the gateway 42 is determined so that the above-mentioned second non-completion rate is a value between a predetermined upper limit and a lower limit.

  In this regulation, it is determined whether or not the completion rate, which is the ratio of the number of completed sessions to the number of connection request sessions, falls below a predetermined second threshold, and the completion rate falls below the second threshold. For a session for the receiving terminal, at a predetermined time interval or a time interval obtained from measurement, or after setting a predetermined time interval, at a time interval corrected by measurement, It may be possible to restrict only one session to pass through the gateway device.

  Further, in the regulation of the session passing through the gateway device in this example, only one session is regulated so as to pass through the gateway device, but the present invention is not limited to this, for example, during 10 sessions. It is possible to restrict a predetermined number of sessions such as two sessions to pass.

  In this example, as shown in FIG. 4, the congestion control device 40 is provided outside the gateway 42, but the congestion control device 40 may be provided inside the gateway 42.

  In this example, the configuration example of FIG. 2 is shown as the computer configuration of the congestion control device. However, a computer configuration without a keyboard or optical disk drive device may be used. In this example, an optical disk is used as a recording medium. However, an FD (Flexible Disk) or the like may be used as a recording medium. As for the program installation, the program may be downloaded and installed via a network via a communication device.

It is a block diagram which shows the structural example of the congestion control apparatus concerning this invention. It is a block diagram which shows the hardware structural example of the congestion control apparatus in FIG. It is a flowchart which shows the example of the congestion control method concerning the present invention of the congestion control apparatus in FIG. It is a block diagram which shows the structural example of the network which provided the congestion control apparatus concerning this invention.

Explanation of symbols

  1: incomplete session detection unit, 2: incomplete rate measurement unit, 3: second incomplete rate measurement unit, 4: first incomplete rate measurement unit, 5: restriction control unit, 6: restriction execution / release Part: 21: display device, 22: input device, 23: external storage device, 24: information processing device, 24a: CPU, 24b: main memory, 24c: input / output interface, 25: optical disk, 26: drive device, 27: Communication device.

Claims (13)

A congestion control system for controlling the congestion caused by the setting of the put ruse cushions between different networks connected via a gateway,
A first means for monitoring all sessions that pass through the gateway device, and for each incoming call terminal unit, acquiring a completion or non-completion result of the session to the terminal and storing the result in a storage device;
Read the session completion result information or non-completion result information from the storage device, based on the completion information or non-completion information ,
The first non-completion rate as a ratio of the number of session requests not passing through the gateway device to the number of session requests applied to the gateway device from the network for each receiving terminal, or the first completion rate as a ratio of the number of session requests passing through second means for calculating a,
Whether the first incompletion rate is below a predetermined first upper limit threshold R0 and below a first lower limit threshold R1, or the first completion rate is a second lower limit A third means for determining whether the threshold value is exceeded and the second upper limit threshold value is exceeded;
When the first non-completion rate is lower than the first upper limit threshold value R0 and lower than the first lower limit value R1, or when the first completion rate is higher than the second lower limit threshold value and the second lower limit threshold value R1. A fourth means for removing non-completion result information or completion result information of a session related to the called terminal stored in the storage device when the upper limit threshold is exceeded;
When the first non-completion rate exceeds the first upper limit threshold value R0 or when the first completion rate falls below the second lower limit threshold value, to the receiving terminal that passes through the gateway A fifth means for restricting the session setting request at a predetermined restriction value;
During the regulation by the fifth means, the second incomplete rate or the number of completed sessions as a ratio of the number of incomplete sessions to the number of session requests to the network that has passed through the gateway device (to the destination terminal) A sixth means for calculating a second completion rate as a percentage;
Whether the second incomplete rate is below a predetermined third upper limit threshold RU2 and below a third lower limit threshold RL2, or the second completion rate is a fourth lower limit A seventh means for determining whether the threshold value is exceeded and the fourth upper limit threshold value is exceeded;
When the second incomplete rate exceeds the third upper limit threshold RU2, or when the second completion rate falls below the fourth lower limit threshold, the regulation by the fifth means is strengthened. When the second non-completion rate falls below the third upper limit threshold value RU2 and falls below the third lower limit threshold value RL2, or the second completion rate exceeds the fourth lower limit threshold value and the fourth An congestion control apparatus comprising: an eighth means for relaxing the restriction by the fifth means when the upper limit threshold is exceeded . The congestion control device according to claim 1,
The fifth means is
For the session of this the called party's terminal, is corrected for the number of times of connection requests that are determined from a predetermined number of times or measurement, or, after setting the number of times predetermined by measuring against the number of times of connection requests, the hand stages only advance speed-determined session restricted to pass through the gateway device
Congestion control apparatus characterized by having a. The congestion control device according to claim 1,
The fifth means is
Respect of those said called party's terminal session, at a time interval obtained from a predetermined time interval or measurement, or, after setting a predetermined time interval, the time interval that has been modified by the measurement, hand stage only advance speed-determined session restricted to pass through the gateway device
Congestion control apparatus characterized by having a. The congestion control device according to any one of claims 1 to 3 ,
The restriction release threshold as a lower threshold with respect to the first non-completion rate, or set the restriction release threshold as an upper limit threshold relative to the first completion rate,
If the first non-completion rates above SL is below the deregulation threshold, or when the first completion rate exceeds the restriction release threshold, further comprising means for performing deregulation in the gateway device A feature congestion control device. The congestion control device according to claim 2,
The means for regulating the session passing through the gateway device is:
As above Symbol second uncompleted rate becomes a value between the third upper threshold RU2 between the third lower threshold RL2, or the second completion rate is the fourth upper limit threshold and said second 4 so that the value between the lower threshold, means to determine a session connection request count when passing the gateway number above is predetermined session
Congestion control apparatus characterized by having a. The congestion control device according to claim 3,
The means for regulating the session passing through the gateway device is:
As above Symbol second uncompleted rate becomes a value between the third upper threshold RU2 between the third lower threshold RL2, or the second completion rate is the fourth upper limit threshold and said second 4 so that the value between the lower threshold, means to determine the time interval between the passage of the gateway device the number of the is predetermined session
Congestion control apparatus characterized by having a. The program for functioning a computer as each means in the congestion control apparatus in any one of Claims 1-6 . A congestion control method of the apparatus for controlling congestion due to the setting of Rousset cushions put between different networks connected via a gateway,
A first step of monitoring all sessions passing through the gateway device, obtaining a completion or non-completion result of the session to the terminal and storing it in the storage device for each receiving terminal;
Read the completion result information or non-completion result information of the session from the storage device, and based on the completion information or non-completion information, do not pass through the gateway device for the number of session requests to be added to the gateway device from the network for each receiving terminal. A second step of calculating a first incompletion rate as a proportion of the number of session requests or a first completion rate as a proportion of the number of session requests that pass through ;
Whether the first incompletion rate is below a predetermined first upper limit threshold R0 and below a first lower limit threshold R1, or the first completion rate is a second lower limit A third step of determining whether the threshold value is exceeded and the second upper limit threshold value is exceeded;
When the first non-completion rate falls below the first upper limit threshold value R0 and falls below the first lower limit value R1, or when the first completion rate exceeds the second lower limit threshold value and the second lower limit threshold value R1. A fourth step of removing incomplete result information or completion result information of a session related to the called terminal stored in the storage device when the upper limit threshold is exceeded;
When the first non-completion rate exceeds the first upper limit threshold value R0 or when the first completion rate falls below the second lower limit threshold value, to the receiving terminal that passes through the gateway A fifth step of restricting the session setting request at a predetermined restriction value;
The second incomplete rate or the number of completed sessions as a ratio of the number of incomplete sessions to the number of session requests (to the destination terminal) to the network that has passed through the gateway device during the restriction in the fifth step A sixth step of calculating a second completion rate as a percentage of
Whether the second incompletion rate is below a predetermined third upper limit threshold RU2 and below a third lower limit threshold RL2, or the second completion rate is a fourth lower limit A seventh step of determining whether the threshold value is exceeded and the fourth upper limit threshold value is exceeded;
If the second non-completion rate exceeds the third upper limit threshold RU2, or if the second completion rate falls below the fourth lower limit threshold, the restriction in the fifth step is strengthened. When the second non-completion rate falls below the third upper limit threshold value RU2 and falls below the third lower limit threshold value RL2, or the second completion rate exceeds the fourth lower limit threshold value and the second When the upper limit threshold of 4 is exceeded, an eighth step for loosening the restriction in the fifth step is as follows:
The congestion control method characterized by performing the process which consists of . The congestion control method according to claim 8 , comprising:
In the fifth step ,
For the session of this the called party's terminal, is corrected for the number of times of connection requests that are determined from a predetermined number of times or measurement, or, after setting the number of times predetermined by measuring against the number of times of connection requests, the congestion control method in which only the advance speed-determined session, wherein the benzalkonium be regulated so as to pass through the gateway device. The congestion control method according to claim 8 , comprising:
In the fifth step ,
Respect of those said called party's terminal session, at a time interval obtained from a predetermined time interval or measurement, or, after setting a predetermined time interval, the time interval that has been modified by the measurement, congestion control method in which only pre-number-determined session, wherein the benzalkonium be regulated so as to pass through the gateway device. A congestion control method according to any one of claims 8 to 10 ,
The restriction release threshold as a lower threshold with respect to the first non-completion rate, or set the restriction release threshold as an upper limit threshold relative to the first completion rate,
When the case where the first non-completion rates above SL is below the deregulation threshold, that or the first completion rate exceeds the restriction release threshold, and performs deregulation in the gateway device Congestion control method. The congestion control method according to claim 9 , comprising:
In the step of regulating the session passing through the gateway device ,
As above Symbol second uncompleted rate becomes a value between the third upper threshold RU2 between the third lower threshold RL2, or the second completion rate is the fourth upper limit threshold and said second 4 so that the value between the lower threshold, the congestion control method comprising the Turkey to determine the session connection request count when passing the gateway number above is predetermined session. The congestion control method according to claim 10 , comprising:
In the step of regulating the session passing through the gateway device ,
As above Symbol second uncompleted rate becomes a value between the third upper threshold RU2 between the third lower threshold RL2, or the second completion rate is the fourth upper limit threshold and said second 4 so that the value between the lower threshold, the congestion control method comprising the Turkey to determine the time interval between the passage of the gateway device the number of the is predetermined session.

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