JP2014158079A - System and method for congestion control - Google Patents

Abstract

A presence service that guarantees the distribution of important information even during congestion is provided.
A congestion control system 1 searches for information on the seventh level (application layer) of an OSI basic reference model of communication data IP packetized by an identification device 3 transmitted from a user terminal 2, and the communication data is Analyzes whether important information is included. Then, the identification device 3 determines the priority of the communication data based on the analysis result, and sets the priority in the IP header as the third level information of the OSI basic reference model. When the presence server 5 is in a congested state, not only the server system apparatus (including the presence server 5) that handles the seventh level information but also the NW device 4 such as a router that handles the third level information. The amount of the communication data is controlled based on the priority of the communication data requesting the presence server 5 to process.
[Selection] Figure 1

Description

  The present invention relates to a congestion control system and a congestion control method used for a presence service for notifying the state of a user terminal and the state of a user operating the user terminal.

  The “presence service” is a service that notifies the existence and state of everything, not limited to the Internet, in a broad sense. For this reason, this service includes various objects such as humans, machines, and software.

  About this presence service, the application to the Internet technology is examined by IETF (Internet Engineering Task Force). An example of a presence service as Internet technology is shown in FIG.

  It is assumed that a certain user terminal 901-1 receives notification of the information every time there is a change in the state of another user terminal 901-2. Hereinafter, the user terminal 901-2 that notifies the change is referred to as “presentity”, and the user terminal 901-1 that is notified of the state of the other user terminal 901-2 is referred to as “watcher”. Here, when the user terminal 901-1 and the user terminal 901-2 are not distinguished from each other, they are simply referred to as the user terminal 901. The state of the user terminal 901 is, for example, “online (call state)”, “offline (non-call state)”, or the like.

  The user terminal 901-1 of the watcher who wants to know the state of the user terminal 901-2 of the presentity issues “SUBSCRIBE” shown in “F01” of FIG. This “SUBSCRIBE” indicates an application for information acquisition. At this time, the address “BBBB” representing the presentity user terminal 901-2 is specified in the TO header of the communication data, and further the notification expiration date (Expire) is specified. Note that “Expire = 3600” in FIG. 11 indicates that the notification valid period is 3600 (seconds).

  When the presence server 902 that manages the presentity user terminal 901-2 accepts this, it responds with “200 (ok)” (F02), and at the same time, changes the state of the presentity user terminal 901-2 to “ "NOTIFY" is returned to the user terminal 901-1 of the watcher (F03). Here, the state of the presentity user terminal 901-2 is returned as "offline (non-call state)".

  On the other hand, the presence server 902 receives the power-on information (that is, “REGISTER request”) from the user terminal 901-2 in order to manage the state of the user terminal 901-2. The presentity's user terminal 901-2 is requested to continue to notify the state change in the same manner as that performed by the 901-1 toward the presence server 902 ("F05" to "F06").

  When the presence server 902 receives “NOTIFY (online)” from the user terminal 901-2 (F07), the presence server 902 knows that the presentity user terminal 901-2 has changed from “offline” to “online”. . Here, since the presence server 902 has accepted the state change notification request from the watcher user terminal 901-1 (within the expiration date), “NOTIFY (online)” is set to the watcher user terminal 901-1. 1 is transmitted (F08). Then, the user terminal 901-1 of the watcher makes a response “200 (ok)” (F09).

  Here, the change in the state of the user terminal 901-2 has been described assuming the change in the state of the user terminal (offline, online, power supply “ON”, etc.) generated by the user's operation. A change in the state (position information, etc.) of the user terminal may be set without a user operation by a GPS (Global Positioning System) function provided in the user terminal. The change in the state of the user terminal may be a change in the user's own state (returning home, during a meeting, etc.) set by being registered in the user terminal 901-2 by the user's operation.

  In addition, in a system that provides a presence service, as a conventional technique for distributing the load of a presence server, a plurality of presence servers are deployed, and the number of user terminals that are communicating with each other is monitored, and the number of user terminals that are communicating It has been proposed to perform load distribution by assigning a new user terminal to a presence server with a small number (see Patent Document 1).

JP 2009-015485 A

  However, the technique described in Patent Document 1 causes the presence server to become congested when there is a processing request in the presence server that exceeds the design of the entire facility. In other words, during normal times, all user terminals managed by the presence server do not make processing requests to the presence server at the same time. Therefore, users who can be connected to the number of user terminals managed by the presence server are generally connected simultaneously. The entire equipment is designed with a small number of terminals. On the other hand, in an emergency, it is assumed that there is a processing request in the presence server that exceeds the design of the entire facility. In this case, the presence server becomes congested. Here, if the presence server has a processing request that exceeds the design of the entire facility, for example, a disaster (earthquake, etc.) occurs in a certain area, and users who are more than designed in order to confirm the impact of the disaster This is the case when the power supply of the terminal is simultaneously “ON”.

  Therefore, there is a problem that the presence server in the congestion state cannot guarantee the distribution of important information in the presence service. Here, the important information may be information that the administrator of the presence server recognizes as important for the user and is arbitrarily selected. The administrator of the presence server, for example, determines a specific state change (user terminal power supply “ON” information or user terminal movement information from the relationship with the cause of the processing request exceeding the design of the entire facility (disaster occurrence, etc.). ) May be determined as important information, or communication information transmitted from a specific area (transmission from a user terminal in the disaster area) may be determined as important information depending on the relationship with the area (disaster area). Then, based on the user's classification information (gender, age, address, etc.), communication information transmitted from a user belonging to a specific classification (transmission from a child in the event of a disaster) may be determined as important information.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a congestion control system and a congestion control method for a presence service that guarantees the distribution of important information even during congestion.

  In order to solve the above problems, a congestion control system according to the present invention acquires a state of a plurality of user terminals and one user terminal among the plurality of user terminals, and acquires the state acquired by the other user terminals. An identification for identifying presence information to be transmitted, an NW device arranged between the plurality of user terminals and the presence server, for transferring IP packetized communication data, and whether the communication data is important information A congestion control system including a device and a presence server congestion control device connected to the presence server and controlling a congestion state of the presence server, wherein the identification device includes the communication data as the important information Policy information in which identifier information indicating information for identifying whether or not and priority according to the identifier information is associated is stored. A storage unit that receives the communication data with the status of the user terminal from the user terminal, and determines whether the received communication data is communication data destined for the presence server And the destination determination unit determine that the terminal is the communication data destined for the presence server, the user terminal state information indicating the state of the user terminal stored in the application layer of the communication data is the policy information An application data search unit that searches for which of the identifier information stored in the ID matches, and priority that sets the priority corresponding to the identifier information that matches the user terminal status information in the IP header of the communication data A presence setting unit, and the presence server congestion control device includes a resource included in the presence server. A presence server monitoring unit that monitors the processing load of the NW device, and a NW device-side priority control transmission unit that transmits start information of first priority control to the NW device when the processing load exceeds a predetermined value, And when the NW device receives the start information of the first priority control from the presence server congestion control device, the priority is low by referring to the priority set in the IP header of the communication data In this case, a network device-side priority control unit that reduces the transfer amount of the communication data per unit time is provided.

  In addition, the congestion control method according to the present invention includes a plurality of user terminals, a presence server that acquires a state of one user terminal among the plurality of user terminals, and transmits the acquired state to the other user terminals; An NW device arranged between a plurality of the user terminals and a presence server and transferring communication data converted into IP packets; an identification device for identifying whether the communication data is important information; A congestion control method of a congestion control system connected to a presence server and configured by a presence server congestion control device that controls a congestion state of the presence server, wherein the identification device includes the communication data as the important information Policy information in which identifier information indicating information for identifying whether or not and a priority corresponding to the identifier information is associated is stored. And receiving the communication data to which the status of the user terminal is attached from the user terminal, and determining whether the received communication data is communication data destined for the presence server; When it is determined that the communication data is destined for the presence server, the identifier information in which the user terminal state information indicating the state of the user terminal stored in the application layer of the communication data is stored in the policy information The presence server congestion control, and a step of setting the priority corresponding to the identifier information matching the user terminal state information in an IP header of the communication data. A step of monitoring a processing load of resources possessed by the presence server; When the load exceeds a predetermined value, a step of transmitting priority control start information to the NW device is executed, and the NW device performs the first priority control from the presence server congestion control device. When the start information is received, the priority set in the IP header of the communication data is referred to, and when the priority is low, a step of reducing the transfer amount per unit time of the communication data is executed. And

  In this way, in the congestion control system and the congestion control method according to the present invention, the identification device uses the user terminal state information indicating the state of the user terminal stored in the application layer of the communication data as the identifier information of the policy information. A search is made as to whether they match, and the priority corresponding to the identifier information matching the user terminal status information is set in the IP header of the communication data. Therefore, the congestion control system and the congestion control method according to the present invention can control the amount of communication data requiring processing from the presence server in the NW device, and the distribution of important information is guaranteed even when the presence server is congested. The

  Note that the “user terminal state” in the claims includes the state of the user terminal itself (offline, online, power “ON”, power “OFF”, position information, etc.) and the user terminal by operating the user terminal. And the user's own state (returning home, during a meeting, etc.) set in the above.

  In the congestion control system according to the present invention, the presence server congestion control device transmits start information of second priority control to the presence server when the processing load becomes equal to or greater than the predetermined value. A presence server-side priority control transmission unit, and when the presence server receives the second priority control start information from the presence server congestion control device, the priority set in the IP header of the communication data is set. A presence server side priority control unit that performs control so that the communication data is preferentially processed when the priority is high is provided.

  By doing so, the congestion control system according to the present invention also performs priority control in the presence server during congestion. Therefore, the congestion control system according to the present invention can more reliably guarantee the distribution of important information.

  In the congestion control system according to the present invention, the presence server congestion control device further includes a policy notification unit that notifies the identification information to the identification device.

  By doing so, the congestion control system according to the present invention can store policy information in a plurality of identification devices. Therefore, the congestion control system according to the present invention does not need to individually set the policy information of the identification device.

  According to the congestion control system and the congestion control method of the present invention, it is possible to provide a presence service while guaranteeing the distribution of important information even during congestion.

It is a block diagram of the congestion control system which concerns on embodiment. It is a data block diagram of the communication data used with the congestion control system which concerns on embodiment. It is a function block diagram of the identification device which comprises the congestion control system which concerns on embodiment. It is a data block diagram of the policy table stored in the identification device which comprises the congestion control system which concerns on embodiment. It is a functional lineblock diagram of NW equipment which constitutes a congestion control system concerning an embodiment. It is a function block diagram of the presence server which comprises the congestion control system which concerns on embodiment. It is a function block diagram of the presence server congestion control apparatus which comprises the congestion control system which concerns on embodiment. It is a sequence diagram which shows the flow of the congestion control of the congestion control system which concerns on embodiment. It is a flowchart which shows the process of the identification device of the congestion control system which concerns on embodiment. It is a block diagram of the congestion control system which concerns on the modification of embodiment. It is a sequence diagram for demonstrating the conventional presence service.

≪Overview≫
FIG. 1 is a configuration diagram of a congestion control system 1 according to an embodiment of the present invention.
The congestion control system 1 realizes control in the presence service when the presence server 5 is in a congestion state. Here, the identification device 3 searches for the information on the seventh level (application layer) of the OSI basic reference model of the IP packetized communication data transmitted from the user terminal 2, and whether or not the communication data includes important information. Is analyzed. Then, the identification device 3 determines the priority of the communication data based on the analysis result, and sets the priority in the IP header as the third level information of the OSI basic reference model.

  As a result, when the presence server 5 is in a congested state, not only a server system apparatus (including the presence server 5) that handles the seventh level information, but also an NW device 4 such as a router that handles the third level information. The amount of communication data can be controlled on the basis of the priority of the communication data requesting the presence server 5 to process. Therefore, according to the congestion control system 1, the congestion control that preferentially handles the important information during the congestion is executed, and the distribution of the important information is guaranteed.

<< Configuration of Congestion Control System According to Embodiment >>
<Overall configuration>
As shown in FIG. 1, the congestion control system 1 includes a plurality of user terminals 2, first to fourth identification devices (described as “first identification device” in FIG. 1) 3, The network device includes a network device (described as “first network device” in FIG. 1) 4, a presence server 5, and a presence server congestion control device 6. Below, each structure is demonstrated.

  Here, the user terminal 2 and the first to fourth identification devices are connected using, for example, wireless communication. Further, between the first and second identification devices 3 and the second NW device 4, between the third and fourth identification devices 3 and the third NW device 4, and between the second and third NW devices. 4 and the first NW device 4, and the first NW device 4 and the presence server 5 and presence server congestion control device 6 are communicably connected via an optical fiber line, for example. And

<User terminal>
The user terminal 2 is a terminal used by the user to receive the presence service provided by the presence server 5. In this embodiment, the case where the user terminal 2 is a multi-function mobile phone (smart phone) will be described. However, the user terminal 2 is not limited to a multi-function mobile phone, and may be, for example, a mobile phone or a PC (Personal Computer). A plurality of user terminals 2 are installed in the first region to the fourth region (in FIG. 1, illustration of the user terminals 2 in the second region and the third region is omitted).

  The user terminal 2 stores an application program for receiving the presence service in the storage unit, and the control unit can receive the presence service by executing the application program. The type of application program is not particularly limited. In the present embodiment, it is assumed that the user terminal 2 receives provision of presence service by transmitting / receiving application data described in XML (Extensible Markup Language) to / from the presence server 5 using SIP (Session Initiation Protocol). I will explain.

  With reference to FIG. 2, a data configuration example of communication data P transmitted from the user terminal 2 to the presence server 5 will be described. Communication data P includes an Ethernet (Ethernet (registered trademark)) header P1, an IP (Internet Protocol) header P2, a TCP / UDP (Transmission Control Protocol / User Datagram Protocol) header P3, an SIP header P4, and a payload portion. It consists of application data P5 and an Ethernet trailer P6. In the congestion control system 1 according to the embodiment, information stored in the SIP header P4 and the application data P5 is searched to analyze whether or not the communication data P includes important information. Then, the priority of the communication data P is determined based on the analysis result, and the priority is set in the TOS field P21 of the IP header (details will be described later). The SIP header P4 and the application data P5 may be collectively referred to as “application layer”.

<Identification device>
With reference to FIG. 3, the functional configuration of the identification device 3 will be described. The identification device 3 identifies whether or not the communication data P includes important information. In the present embodiment, the identification device 3 is a relay device that can handle up to the seventh level information of the OSI basic reference model. The identification device 3 is installed in a POP (Point Of Presence), and functions as an edge router that contacts the user terminal 2.

  As illustrated in FIG. 3, the identification device 3 includes a storage unit 10 and a control unit 20. The storage unit 10 includes a storage medium such as a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), and a flash memory. The control unit 20 is realized by a program execution process by a CPU (Central Processing Unit) included in the identification device 3, a dedicated circuit, or the like. When the control unit 20 is realized by a program execution process, the storage unit 10 stores a program for realizing the function of the control unit 20.

  The storage unit 10 stores a policy table (policy information) 11 and a routing table 12. Since the routing table 12 is a well-known technical content, description thereof is omitted, and only the policy table 11 will be described here.

  The policy table 11 will be described with reference to FIG. Here, the “policy” determines whether or not the presence server 5 is preferentially processed when the presence server 5 is congested, that is, whether or not the communication data includes important information. This means decision information (priority) for For example, when the communication data P includes important information, the presence server 5 preferentially processes the communication data P so that the priority is set high. Specifically, the policy table 11 includes identifier information 111 and priority 112.

  The identifier information 111 is information (character string) for identifying whether or not the communication data P (see FIG. 2) includes important information. In FIG. 4, “terminal movement information” and “busy information” are illustrated as the identifier information 111. The “terminal movement information” is information indicating the position of the terminal such as “home” or “company”, for example. Further, “busy information” is information indicating the call state of the terminal such as “online” and “offline”, for example.

  The priority 112 is information indicating the priority of the communication data P corresponding to the identifier information 111 at the time of congestion. In FIG. 4, “high” and “low” are illustrated as the priorities 112 of the communication data P (see FIG. 2). “High” indicates that processing is preferentially performed when the corresponding identifier information 111 (“terminal movement information” in FIG. 4) is included in the communication data P. “Low” indicates that priority is not given to processing when the corresponding identifier information 111 (“busy information” in FIG. 4) is included in the communication data P.

  Subsequently, returning to FIG. 3, the control unit 20 will be described. The control unit 20 includes a destination determination unit 21, an application data search unit 22, a priority setting unit 23, and an identification device side routing unit 24.

  When the communication data P is received from the user terminal 2, the destination determination unit 21 refers to the IP header P <b> 2 (FIG. 2) and determines whether the received communication data P is communication data P destined for the presence server 5. Determine whether.

  The application data search unit 22 includes information (user terminal state information) included in the SIP header P4 (FIG. 2) and application data P5 (FIG. 2) of the communication data P destined for the presence server 5 determined by the destination determination unit 21. Are compared with the identifier information 111 of the policy table 11 (FIG. 4). Then, the application data search unit 22 searches whether the identifier information 111 stored in the policy table 11 is included in the SIP header P4 or the application data P5.

  The priority setting unit 23 sets the corresponding priority 112 of the policy table 11 in the TOS field P21 (FIG. 2) of the IP header P2 based on the search result of the application data search unit 22. For example, when the “terminal movement information” is included in the SIP header P4 or the application data P5 of the communication data P, the priority setting unit 23 sets the priority to “high” and the “busy information” If so, set the priority to low. Further, the priority setting unit 23 updates the policy table 11 based on the policy information received from the presence server congestion control device 6.

  The identification device side routing unit 24 refers to the routing table 12 and determines the transfer destination of the communication data P. Then, the identification device side routing unit 24 transmits the communication data P that is converted into an IP packet to the determined transfer destination.

<NW equipment>
The functional configuration of the NW device 4 will be described with reference to FIG. The NW device 4 transfers the communication data P to the next device. In the present embodiment, the NW device 4 is a relay device that can handle up to the third level information of the OSI basic reference model, and assumes, for example, a router. The NW device 4 is installed in a POP or NOC (Network Operations Center) and functions as a core router. In FIG. 1, the first NW device 4 is installed in the NOC, and the second and third NW devices 4 are installed in the POP.

  The NW device 4 includes a storage unit 30 and a control unit 40. The storage unit 30 includes a storage medium such as a RAM, a ROM, an HDD, and a flash memory. The control unit 40 is realized by a program execution process by a CPU provided in the NW device 4, a dedicated circuit, or the like. When the control unit 40 is realized by a program execution process, the storage unit 30 stores a program for realizing the function of the control unit 40.

  The storage unit 30 stores a routing table 31. Since the routing table 31 has a well-known technical content, description thereof is omitted. The control unit 40 includes an NW device side priority control unit 41 and an NW device side routing unit 42.

  The NW device side priority control unit 41 performs priority control on the NW device side based on the priority set in the TOS field P21 (FIG. 2) of the communication data P when the presence server 5 is in a congested state. Specifically, the NW device side priority control unit 41 makes it easy for the high priority communication data P to be transferred with priority, and makes the low priority communication data P easy to discard. Thereby, the NW device side priority control unit 41 controls (decreases) the transfer amount per unit time for the low priority communication data P to reach the presence server 5. The NW device side priority control unit 41 may transfer the low-priority communication data P after a certain amount of time has elapsed.

  The NW device side routing unit 42 transfers the communication data P to the next device based on the priority control of the NW device side priority control unit 41. Specifically, the NW device side routing unit 42 refers to the routing table 31 and determines the transfer destination of the communication data P. Then, the NW device side routing unit 42 transmits the communication data P converted into an IP packet to the determined transfer destination.

<Presence server>
The functional configuration of the presence server 5 will be described with reference to FIG. The presence server 5 provides a presence service to the user via the user terminal 2. In the present embodiment, the presence server 5 is installed in the NOC and is communicably connected to the presence server congestion control device 6 and the first NW device 4 (see FIG. 1).

  The presence server 5 includes a control unit 50 and a storage unit (not shown). The control unit 50 is realized by a program execution process by a CPU provided in the presence server 5, a dedicated circuit, or the like. When the control unit 50 is realized by program execution processing, a program for realizing the function of the control unit 50 is stored in a storage unit (not shown). The control unit 50 includes a processing load monitoring unit 51, a presence server side priority control unit 52, and a presence processing unit 53.

  The processing load monitoring unit 51 monitors the processing load of resources provided in the presence server 5. Here, the resource processing load is, for example, a CPU usage rate or a memory usage amount provided in the presence server 5. Further, when the processing load monitoring unit 51 receives a processing load inquiry from the presence server congestion control device 6, the processing load monitoring unit 51 transmits the processing load of the resources included in the presence server 5 as a response.

  The presence server side priority control unit 52 performs priority control on the presence server side based on the priority set in the TOS field P21 (FIG. 2) of the communication data P. For example, the presence server side priority control unit 52 performs priority queuing processing of the application data P5 based on the priority set in the TOS field P21. The priority queuing process will be described below.

  The presence server side priority control unit 52 refers to the priority set in the TOS field P21 for the received communication data P, and determines whether or not to prioritize the processing of the application data P5 stored in the communication data P. . Specifically, the presence server side priority control unit 52 determines to prioritize processing of the communication data P in which the priority “high” is set in the TOS field P21, and stores the application data P5 in a priority queue (not shown). . On the other hand, the presence server side priority control unit 52 determines that the processing of the communication data P in which the priority “low” is set in the TOS field P21 is not given priority, and stores the application data P5 in a non-priority queue (not shown). Here, the priority queue is set to have a higher weight with respect to the number of processes per time than the non-priority queue. Then, the presence server side priority control unit 52 uses the WRP (Weighted Round Robin) method, the PQ (Priority Queueing) method, or the like so that the application data P5 stored in the priority queue is preferentially processed. Control.

  The presence processing unit 53 processes the application data P5 stored in the priority queue and the non-priority queue based on the presence server-side priority control unit 52. Here, as described above, since the weight is set higher in the priority queue than in the non-priority queue, the presence processing unit 53 preferentially executes the processing of the application data P5 stored in the priority queue. Note that if the priority control start instruction is not transmitted from the presence server congestion control device 6, the presence processing unit 53 does not perform the priority queuing process.

<Presence server congestion control device>
With reference to FIG. 7, the functional configuration of the presence server congestion control device 6 will be described. The presence server congestion control device 6 controls the amount of communication data P (processing request) addressed to the presence server 5 from the user terminal 2 when the presence server 5 becomes congested. In the present embodiment, the presence server congestion control device 6 is installed in the NOC and is communicably connected to the presence server 5 and the first NW device 4 (see FIG. 1).

  The presence server congestion control device 6 includes a control unit 60 and a storage unit (not shown). The control unit 60 is realized by a program execution process by a CPU provided in the presence server congestion control device 6, a dedicated circuit, or the like. When the control unit 60 is realized by a program execution process, a program for realizing the function of the control unit 60 is stored in a storage unit (not shown).

  The control unit 60 includes a policy notification unit 61, a presence server monitoring unit 62, an NW device side priority control transmission unit 63, and a presence server side priority control transmission unit 64.

  The policy notification unit 61 notifies (transmits) the policy information to the first to fourth identification devices 3. The policy information is information including, for example, a character string (identifier information 111 in FIG. 4) included in the SIP header P4 and application data P5, and a priority 112 associated therewith. The identification device 3 updates the policy table 11 based on the received policy information.

  The presence server monitoring unit 62 inquires of the presence server 5 about the resource processing load. Further, the presence server monitoring unit 62 receives a resource processing load from the presence server 5 as a response. Here, the resource processing load is, for example, a CPU usage rate or a memory usage amount provided in the presence server 5. Then, the presence server monitoring unit 62 determines that the presence server 5 is in a congestion state when the processing load of the received resource is equal to or greater than a predetermined value.

  When the presence server 5 determines that the presence server 5 is in a congested state, the NW device side priority control transmission unit 63 transmits priority control start information (first priority control start information) to the NW device 4. The range in which the priority control start information is transmitted may be the same as the first to third NW devices 4 shown in FIG. 1, or the first position close to the first to fourth identification devices 3. The target may be limited to the second and third NW devices 4, or may be limited to the first NW device 4 at a position close to the presence server 5.

The presence server side priority control transmission unit 64 transmits priority control start information (second priority control start information) to the presence server 5 when it is determined that the presence server 5 is in a congestion state.
Above, description about the structure of the congestion control system 1 which concerns on embodiment is complete | finished.

<< Congestion Control Method of Congestion Control System According to Embodiment >>
With reference to FIG. 8, the congestion control method of the congestion control system 1 which concerns on embodiment is demonstrated. FIG. 8 will be described assuming that the user terminal 2 in the first region is notified of the state of the user terminal 2 in the fourth region.

  Here, the policy notification unit 61 of the presence server congestion control device 6 according to the embodiment notifies (transmits) the policy information to the identification device 3 as a prior operation of congestion control, and the identification device 3 stores the policy table 11. It shall be remembered.

<Congestion control method>
The presence server monitoring unit 62 of the presence server congestion control device 6 makes an inquiry about the resource processing load to the presence server 5 (step S10), and receives a response of the resource processing load to the inquiry at step S10 ( Step S20). Based on the response, the presence server monitoring unit 62 determines whether or not the presence server 5 is in a congested state (step S30). Here, it is assumed that the presence server monitoring unit 62 determines that the presence server 5 is in a congestion state.

  When the presence server 5 side priority control transmission unit 63 of the presence server congestion control device 6 determines that the presence server 5 is in a congested state in step S30, the first to third NW devices 4 (in FIG. The priority control start information is transmitted to (only the NW device 4 is described) (step S40). Further, the presence server side priority control transmission unit 64 of the presence server congestion control device 6 transmits priority control start information to the presence server 5 when it is determined in step S30 that the presence server 5 is in a congestion state. (Step S50).

  Subsequently, it is assumed that a state change has occurred in the presentity user terminal 2 installed in the fourth area (step S60). The presentity user terminal 2 transmits the communication data P with the presence server 5 as the destination and the state change stored in the SIP header P4 and the application data P5 to the fourth identification device 3 (step S70).

Subsequently, the fourth identification device 3 performs priority setting processing based on the policy table 11 (step S80). Details of the priority setting process will be described with reference to FIG.
The destination determination unit 21 of the fourth identification device 3 determines whether or not the received communication data P is destined for the presence server 5 (step S81). If “Yes” in the step S81, the process proceeds to a step S82. On the other hand, if “No” in the step S81, the process proceeds to a step S84. If “Yes” in step S81, the application data search unit 22 compares the information (user terminal state information) included in the SIP header P4 and application data P5 of the communication data P with the policy table 11 (step S82). . Then, the application data search unit 22 searches whether the same information as the identifier information 111 of the policy table 11 is included in the SIP header P4 and the application data P5.

  Subsequently, the priority setting unit 23 sets the priority 112 corresponding to the identifier information 111 that matches the information (user terminal state information) included in the SIP header P4 and the application data P5 of the communication data P by the application data search unit 22. It is set in the TOS field P21 of the IP header P2 (step S83). In the case of “No” in step S81 and subsequent to step S83, the identification device side routing unit 24 determines the transfer destination of the communication data P (step S84).

  Returning to FIG. 8, the subsequent processing will be described. The identification device side routing unit 24 of the fourth identification device 3 transfers (transmits) the communication data P to the transfer destination (third NW device 4) determined in step S84 (step S90).

  Subsequently, the NW device side priority control unit 41 of the third NW device 4 performs priority control on the NW device side based on the priority set in the TOS field P21 of the IP header P2 (step S100). Then, the NW device side priority control unit 41 discards the low priority communication data P (step S110). On the other hand, the NW device side routing unit 42 of the third NW device 4 transfers (transmits) the high priority communication data P to the presence server 5 via the first NW device 4 (step S120).

Subsequently, the presence server side priority control unit 52 of the presence server 5 performs priority control on the presence server side based on the priority set in the TOS field P21 of the IP header P2 (step S130). Then, the presence processing unit 53 transmits the communication data P with high priority to the user terminal 2 of the watcher (Step S140).
This is the end of the description of the congestion control method of the congestion control system 1 according to the embodiment.

As described above, the congestion control system 1 according to the embodiment uses the seventh level information (SIP header P4 and application data P5) of the communication data P that is converted into the IP packet transmitted from the user terminal 2 by the identification device 3. It searches and analyzes whether the communication data P contains important information. Then, the identification device 3 determines the priority of the communication data P based on the analysis result, and sets the priority in the TOS field P21 of the IP header P2 as the third level information.
Therefore, when the presence server 5 is in a congested state, not only a server device (including the presence server 5) that handles the seventh level information (application data P5) but also a router that handles the third level information. The NW device 4 can control the amount of communication data P requested to be processed by the presence server 5, and the distribution of important information is guaranteed even when the presence server 5 is congested.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can implement in the range which does not change the meaning. The modification of embodiment is shown below.

  In the congestion control system 1 (see FIG. 1) according to the embodiment, the first to fourth identification devices 3 are installed in a POP (Point Of Presence) and function as an edge router in contact with the user terminal 2. However, the location and number of the identification devices 3 are not limited to this. For example, as in the congestion control system 1A shown in FIG. 10, one identification device 3A may be installed in the NOC and function as a core router. By doing in this way, the same effect as the present invention can be obtained.

  Further, in the congestion control system 1 according to the embodiment, two levels of “high” and “low” are exemplified as the priorities set in the policy table 11 (see FIG. 4). However, the priority is not limited to this. For example, the priority levels may be expressed in a plurality of stages from “1” to “n (n is an integer of 3 or more)” (priority increases in ascending order). In this case, the NW device 4 may perform priority control for communication data with a priority “2” or higher, and the presence server 5 may perform priority control for communication data with a priority “3” or higher. .

DESCRIPTION OF SYMBOLS 1,1A Congestion control system 2 User terminal 3, 3A Identification apparatus 4 NW apparatus 5 Presence server 6 Presence server congestion control apparatus 10,30 Storage part 11 Policy table (policy information)
111 Identifier information 112 Priority 12, 31 Routing table 20, 40, 50, 60 Control unit 21 Destination determination unit 22 Application data search unit 23 Priority setting unit 24 Identification device side routing unit 41 NW device side priority control unit 42 NW device Side routing unit 51 Processing load monitoring unit 52 Presence server side priority control unit 53 Presence processing unit 61 Policy notification unit 62 Presence server monitoring unit 63 NW device side priority control transmission unit 64 Presence server side priority control transmission unit P Communication data

Claims (4)

A plurality of user terminals, a presence server that acquires the state of one of the plurality of user terminals and transmits the acquired state to the other user terminals, between the plurality of user terminals and the presence server Connected to the presence server, and a congestion state of the presence server connected to the presence server, an NW device that transfers the communication data that has been converted into IP packets, and an identification device that identifies whether the communication data is important information A congestion control system comprising a presence server congestion control device for controlling
The identification device includes:
A storage unit that stores identifier information indicating information for identifying whether or not the communication data is the important information, and policy information in which a priority according to the identifier information is associated;
A destination determination unit that receives the communication data to which the state of the user terminal is attached from the user terminal and determines whether the received communication data is communication data destined for the presence server;
When the destination determination unit determines that the communication data is destined for the presence server, user terminal state information indicating the state of the user terminal stored in the application layer of the communication data is stored in the policy information. An application data search unit that searches for which of the identifier information matches,
A priority setting unit that sets the priority corresponding to the identifier information that matches the user terminal state information in an IP header of the communication data;
The presence server congestion control device includes:
A presence server monitoring unit that monitors the processing load of the resources of the presence server;
An NW device side priority control transmission unit that transmits start information of first priority control to the NW device when the processing load becomes a predetermined value or more;
The NW device is
When the start information of the first priority control is received from the presence server congestion control device, the priority set in the IP header of the communication data is referred to, and when the priority is low, the unit time of the communication data Including a priority control unit on the NW device side that reduces the transfer amount per unit,
Congestion control system characterized by that. The presence server congestion control device includes:
A presence server-side priority control transmission unit that transmits second priority control start information to the presence server when the processing load is equal to or greater than the predetermined value;
The presence server
When the second priority control start information is received from the presence server congestion control device, the priority set in the IP header of the communication data is referred to, and when the priority is high, the communication data is given priority. A presence server-side priority control unit that performs control so as to perform processing.
The congestion control system according to claim 1. The presence server congestion control device includes:
A policy notification unit for notifying the identification information to the identification device;
The congestion control system according to claim 1 or 2, characterized by the above. A plurality of user terminals, a presence server that acquires a state of one user terminal among the plurality of user terminals and transmits the acquired state to the other user terminals, and a plurality of the user terminals and the presence server An NW device that is placed in between and transfers IP packetized communication data, an identification device that identifies whether the communication data is important information, and a congestion of the presence server connected to the presence server A congestion control method for a congestion control system comprising a presence server congestion control device for controlling a state,
The identification device includes:
A storage unit that stores identifier information indicating information for identifying whether or not the communication data is the important information, and policy information in which a priority according to the identifier information is associated;
Receiving the communication data to which the state of the user terminal is attached from the user terminal, and determining whether the received communication data is communication data destined for the presence server;
When it is determined that the communication data is destined for the presence server, user terminal status information indicating the status of the user terminal stored in the application layer of the communication data is stored in the policy information. Searching for a match, and
Setting the priority corresponding to the identifier information matching the user terminal state information in the IP header of the communication data;
The presence server congestion control device includes:
Monitoring the resource processing load of the presence server;
When the processing load is equal to or greater than a predetermined value, the step of transmitting priority control start information to the NW device,
The NW device is
When the start information of the first priority control is received from the presence server congestion control device, the priority set in the IP header of the communication data is referred to, and when the priority is low, the unit time of the communication data Perform steps to reduce the amount of per transfer,
A congestion control method characterized by the above.

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