JP2017147489A - Communication control system, communication control method, communication control program, and communication control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve lower cost, simplification, shorter construction time of a client server system which performs load distribution.SOLUTION: A communication control system comprises a plurality of signaling servers. A signaling server #1 (203-1) receives an INVITE request from a mobile client #1 (202-1), and transmits the request to a signaling server #2 (203-2) lower than predetermined load information among the plurality of signaling servers. The signaling server #2 (203-2) receives the INVITE request from the signaling server #1 (203-1), performs push notification processing to a mobile client #2 (202-2) and REGISTER processing from the mobile client #2 (202-2) to register information of the mobile client #2 (202-2), and transmits the INVITE request to the mobile client #2 (202-2).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication control system, a communication control method, a communication control program, and a communication control device.

  An example of a system having a communication control apparatus is a client server system. Examples of services realized by the client server system include IP telephones using VoIP (VoIP: Voice over Internet Protocol (IP)), presence, chat, and video conferencing. In such services, media (audio, video, text, etc.) are transmitted and received between client servers, and SIP (Session Initiation Protocol) is often used at that time. A client server system that provides a VoIP service has a SIP server for controlling the system, and this SIP server has a registration server and a VoIP server. Here, the registration server has a processing configuration for a client such as a mobile terminal to register its own IP address. Here, the VoIP server has a processing configuration for controlling connection and disconnection of communication between clients. Here, the SIP server has a processing configuration for resolving an IP address necessary for transmitting a message from one client to the other client when one client makes a call to the other client by IP telephone. The SIP server has a processing configuration for generating a session related to an association between communication applications between clients (for example, start of communication, disconnection of communication, etc.).

  As shown in FIG. 11, when one client (client 1) makes a call to the other client (client 2) by IP telephone, the SIP server resolves each IP address and generates a session. As an example, the SIP sequence when a call is started between the client 1 and the client 2 is as shown in FIG. 12, for example, according to the contents described in Non-Patent Document 1.

  In a conventional client server system, for IP telephone communication between clients, a SIP server (registration server, VoIP server) resolves the IP address of each client and performs session control such as start, change, and end of a session. However, when the number of clients that register IP addresses in the registration server increases, the load on the SIP server increases, and the client server system cannot operate as expected. In other words, as shown in FIG. 13, since a plurality of clients (clients 1 to N) are connected to one SIP server, the conventional client server system has a single point of failure (SPoF: The SIP server cannot be stably operated due to a single point of failure, and the scalability and reliability of the client server system cannot be guaranteed.

[Online], [Search January 21, 2016], Internet <URL: http://tools.ietf.org/html/rfc3261>

  As techniques for avoiding SPoF, there are load distribution techniques such as DNS (Domain Name Server) round robin, load balancer, and clustering. However, these technologies have problems such as enormous costs for the equipment and software to be prepared, advanced knowledge for setting and maintenance of the equipment and software to be prepared, and a long time for building a client-server system. is there.

  Further, Non-Patent Document 1 neither describes nor suggests avoiding SPoF or solving problems related to cost, knowledge, and time associated with avoiding SPoF.

  Therefore, in view of the above circumstances, an object of the present invention is to realize load distribution of a plurality of communication control devices.

  In order to solve the above-mentioned problem, the present invention is a communication control system having a plurality of communication control devices, wherein the first communication control device receives connection request information from a first terminal, and the plurality of communication control devices. A first signaling control unit for transmitting to a second communication control device lower than predetermined load information, wherein the second communication control device receives the connection request information from the first communication control device, A second signaling control unit that performs push notification processing to the terminal and terminal information registration processing from the second terminal, registers second terminal information, and transmits the connection request information to the second terminal; It is characterized by having.

  The present invention is also a communication control system having a plurality of communication control devices, wherein the first communication control device receives connection request information from the first terminal and has a predetermined load among the plurality of communication control devices. A first signaling control unit that transmits to a second communication control device that is lower than the information, wherein the second communication control device receives the connection request information from the first communication control device, and registers a terminal from a second terminal For push notification different from the second communication control device, having a second signaling control unit for executing information processing, registering second terminal information, and transmitting the connection request information to the second terminal The communication control device includes a third signaling control unit that executes a push notification process to the second terminal in response to a request from the second communication control device.

The present invention is also a communication control method in a communication control system having a plurality of communication control devices, wherein the first communication control device receives connection request information from a first terminal, and the plurality of communication control devices. A first signaling control step of transmitting to a second communication control device lower than predetermined load information, wherein the second communication control device receives the connection request information from the first communication control device, and a second terminal A second signaling control step of registering second terminal information and transmitting the connection request information to the second terminal by executing a push notification process to the terminal and a terminal information registration process from the second terminal It is characterized by that.
The present invention is also a communication control method in a communication control system having a plurality of communication control devices, wherein the first communication control device receives connection request information from a first terminal, and the plurality of communication control devices. A first signaling control step of transmitting to a second communication control device lower than predetermined load information, wherein the second communication control device receives the connection request information from the first communication control device, and a second terminal A second signaling control step of registering second terminal information and transmitting the connection request information to the second terminal by executing a terminal information registration process from The different push notification communication control device includes a third signaling control step of executing a push notification process to the second terminal in response to a request from the second communication control device.

The present invention also receives connection request information from a first terminal when a computer as a communication control device, which is one of a plurality of communication control devices included in a communication control system, functions as a first communication control device. When the first communication control unit functions as the first signaling control unit that transmits to the second communication control unit that is lower than the predetermined load information among the plurality of communication control units and functions as the second communication control unit, the first communication control Receiving the connection request information from the device, executing a push notification process to the second terminal and a terminal information registration process from the second terminal, registering the second terminal information, and It is a communication control program for functioning as a second signaling control means for transmitting connection request information.
The present invention also receives connection request information from a first terminal when a computer as a communication control device, which is one of a plurality of communication control devices included in a communication control system, functions as a first communication control device. When the first communication control unit functions as the first signaling control unit that transmits to the second communication control unit that is lower than the predetermined load information among the plurality of communication control units and functions as the second communication control unit, the first communication control Second signaling control for receiving the connection request information from a device, executing terminal information registration processing from a second terminal, registering second terminal information, and transmitting the connection request information to the second terminal And the second terminal in response to a request from the second communication control device when functioning as a push notification communication control device different from the second communication control device. Third signaling control unit for executing a push notification process, which is a communication control program for functioning as a.

In addition, the present invention is a communication control device that is one of a plurality of communication control devices included in a communication control system, and when functioning as a first communication control device, receives connection request information from a first terminal. A first signaling control means for transmitting to a second communication control device that is lower than predetermined load information among the plurality of communication control devices, and when functioning as a second communication control device, from the first communication control device The connection request information is received, push notification processing to the second terminal and terminal information registration processing from the second terminal are executed, second terminal information is registered, and the connection request is sent to the second terminal It has the 2nd signaling control part which transmits information, It is characterized by the above-mentioned.
In addition, the present invention is a communication control device that is one of a plurality of communication control devices included in a communication control system, and when functioning as a first communication control device, receives connection request information from a first terminal. A first signaling control unit that transmits to a second communication control device that is lower than predetermined load information among the plurality of communication control devices, and functions as a second communication control device; A second signaling control unit that receives the connection request information, executes terminal information registration processing from a second terminal, registers second terminal information, and transmits the connection request information to the second terminal; And a third signal that executes push notification processing to the second terminal in response to a request from the second communication control device when functioning as a push notification communication control device different from the second communication control device. Characterized in that it has a ring control unit.

  According to the present invention, it is possible to realize load distribution among a plurality of communication control devices.

1 is an overall configuration diagram of a communication control system according to a first embodiment. It is a block diagram of the signaling server of 1st Embodiment. It is a block diagram of the mobile client of 1st Embodiment. It is a flowchart which shows the operation | movement at the time of starting of a signaling server. It is the example of the content of the file which shows a server state. It is a sequence which shows the operation | movement at the time of the communication start in 1st Embodiment. It is a sequence which shows the operation | movement at the time of the push communication reception in the mobile client of 1st Embodiment. It is an example of the content of the push message received from a signaling server. It is a block diagram of the signaling server of 2nd Embodiment. It is a sequence which shows the operation | movement at the time of the communication start in 2nd Embodiment. It is a figure which shows the example of a conventional SIP client server system structure. It is an example of a SIP sequence in a call service. It is explanatory drawing of SPoF.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the drawings as appropriate.

<< First Embodiment >>
As shown in FIG. 1, the communication control system of this embodiment includes a push communication service (201), mobile clients # 1 and # 2 (202-1 and 202-2), and signaling servers # 1 to # 3 ( 203-1 to 203-3) and a database (204). For convenience of explanation, the mobile clients # 1 and # 2 (202-1 and 202-2) may be collectively referred to as a mobile client (202). Signaling servers # 1 to # 3 (203-1 to 203-3) may be collectively referred to as signaling server (203). The number of mobile clients (202) provided in the communication control system is not limited to two as shown in FIG. 1, and may be three or more. The number of signaling servers (203) provided in the communication control system is not limited to three as shown in FIG. 1, and may be two or four or more.

  The push notification service (201) is a service in which the system side actively notifies information in cooperation with an external server. With the spread of mobile terminals, the use of push notifications has increased and is used in many systems. Examples of the push notification service (201) include Google Cloud Messaging (GCM), Google Cloud Messaging for Chrome (GCM), and Apple Push Notification Service (APNS). In the present embodiment, the push notification service (201) is treated as a functional unit realized by operating on a device (not shown) that provides the service, for example.

  The mobile client (202) is a terminal that is communicably connected to the signaling server (203) and communicates between a plurality of mobile clients (202).

  The signaling server (203) is a server that provides a communication service such as VoIP to the mobile client (202). The signaling server (203) performs push notification to the mobile client (202) using the function of the push notification service (201). The signaling server (203) is communicably connected to the database (204) in order to store data used for providing communication services.

  The database (204) stores data shared by each of the signaling servers (203). In the present embodiment, the database (204) is realized by, for example, a database provided by a DB server (not shown) that is communicably connected to the signaling server (203).

  The mobile client (202) and the signaling server (203) are computers including hardware such as a control unit, a communication unit, and a storage unit. The control unit includes, for example, a CPU (Central Processing Unit) and a dedicated circuit. The communication unit includes a communication interface that transmits and receives information via a communication line, and is connected to the processing unit via an internal bus or the like. The storage unit includes, for example, a storage medium such as a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), and a flash (registered trademark) memory. When the control unit is composed of a CPU, information processing by a computer including the control unit is realized by a program execution process by the CPU. In addition, the storage unit included in the computer stores a program that is instructed by the CPU and implements the function of the computer. This realizes cooperation between software and hardware. The present embodiment can be realized by a program for executing the information processing, and the program can be provided by being stored in a computer-readable recording medium (eg, CD-ROM). The program can also be provided through a network such as the Internet.

  As shown in FIG. 2, the signaling server (203) includes a signaling control unit (301), a push notification unit (302), an inter-signaling server communication unit (303), and a signaling server management unit (306).

  The signaling control unit (301) transmits and receives a session control message (for example, a message for performing session control such as SIP) received from the mobile client (202). The signaling control unit (301) interprets the session control message and performs processing such as session generation, update, and deletion.

  The push notification unit (302) requests the push notification service (201) to transmit a push message in order to make a push notification to the mobile client (202).

  The inter-signaling server communication unit (303) exchanges information between the plurality of signaling servers (203). The inter-signaling server communication unit (303) includes a message transmission unit (304) and a message reception unit (305).

The message transmission unit (304) transmits a session control message to another signaling server (203).
The message receiving unit (305) receives a session control message transmitted from another signaling server (203).

  The signaling server management unit (306) manages the state (details will be described later) of each of the plurality of signaling servers (203). The signaling server management unit (306) includes a server status notification unit (307), a server status acquisition unit (308), a server status evaluation unit (309), and a server status notification timer (310).

  The server status notification unit (307) stores the status of its own signaling server (203) in the database (204). The state of its own signaling server (203) includes, for example, an IP address, a port number, a load level, the number of existing sessions, the number of connected clients, and the ID (Identifier) of the connected client. Further, the load level can be obtained from values such as CPU usage rate, resource usage, disk I / O (Input / Output) amount, for example.

  The server status acquisition unit (308) acquires the status of each of the plurality of signaling servers (203) from the database (204).

  The server state evaluation unit (309) evaluates the state of each of the plurality of signaling servers (203), and selects the signaling server (203) that is determined to be most appropriate for the mobile client (202) to connect.

  The server status notification timer (310) starts a dedicated timer, and determines the timing for periodically storing the status of its own signaling server (203) in the database (204) by the server status notification unit (307).

  As shown in FIG. 3, the mobile client (202) includes a push reception unit (401), a server address management unit (402), and a signaling control unit (405).

  The push receiving unit (401) receives a push notification from the signaling server (203). The push receiving unit (401) interprets the push message notified of the push, and changes the IP address of the signaling server (203) to be connected.

  The server address management unit (402) manages the IP address and port number of the signaling server (203) held inside the mobile client (202). The server address management unit (402) includes a server address editing unit (403) and a server address acquisition unit (404).

  The server address editing unit (403) dynamically changes the IP address and port number of the signaling server (203) held in the mobile client (202).

  The server address acquisition unit (404) acquires the IP address and port number of the signaling server (203) held in the mobile client (202) from the corresponding signaling server (203).

  The signaling control unit (405) transmits / receives a session control message to / from the signaling server (203). The signaling control unit (405) interprets the session control message and performs processing such as session generation, update, and deletion.

  As shown in FIG. 4, the signaling server (203) operates as follows at the time of activation. This operation starts from step A1.

  In step A1, the signaling server (203) generates a unique ID. This ID is generated at the time of first activation, and can be distinguished from other signaling servers (203).

Next, in step A2, the server status notification timer (310) starts its own timer. Thereby, acquisition of the state of its own signaling server (203) is started.
Next, in step A3, the server state notification timer (310) notifies the server state notification unit (307) that the timer has expired.

Next, in step A4, the server state notification unit (307) stores the state of its own signaling server (203) in the database (204) together with the ID of the signaling server (203). The state of the signaling server (203) stored in the database (204) is shown, for example, as a file described in JavaScript (registered trademark) Object Notation shown in FIG. As shown in FIG. 5, the state of the signaling server (203) includes, for example, its own signaling server (203) ID (reference numeral 51), IP address (reference numeral 52), port number (reference numeral 53), load level (reference numeral 54), the number of existing sessions (reference numeral 55), the number of connected mobile clients (202) (reference numeral 56) and ID (reference numeral 57).
Thereafter, the operations in steps A2 to A4 are repeated.

  According to the operation shown in FIG. 4, the signaling server (203) can periodically store its own state in the database.

  As shown in FIG. 6, the operation when the communication control system of this embodiment starts a call between mobile clients # 1 and # 2 (202-1 and 202-2) is as follows. However, mobile client # 1 (202-1) is connected to signaling server # 1 (203-1), and mobile client # 2 (202-2) is not connected to any signaling server (203). And In addition, SIP is used for the session control message. This operation starts from step B1.

  In step B1, the mobile client # 1 (202-1) transmits a REGISTER request message (registration request message) to the signaling server # 1 (203-1). The REGISTER request message includes the ID of the mobile client # 1 (202-1). The signaling control unit # 1 (301-1) transmits a 200 / REGISTER response message corresponding to the REGISTER request message to the mobile client # 1 (202-1). The signaling control unit # 1 (301-1) is a signaling control unit (301) (see FIG. 2) included in the signaling server # 1 (203-1). In addition, the signaling control unit # 1 (301-1) establishes communication using a socket or the like between the mobile client # 1 (201-1) ID and connection information (the mobile client (202) and the signaling server (203)). And the like) are stored in its own storage unit.

  Next, in step B2, the signaling control unit # 1 (301-1) notifies the server state notification unit # 1 (307-1) of the ID of the mobile client # 1 (202-1). The server status notification unit # 1 (307-1) is a server status notification unit (307) (see FIG. 2) included in the signaling server # 1 (203-1).

  Next, in step B3, the server state notifying unit # 1 (307-1) associates the ID of the mobile client # 1 (202-1) with the ID of the signaling server # 1 (203-1) in the database ( 204). An example of this processing is to add the ID of the mobile client # 1 (202-1) to the "clients" array (reference numeral 57) of the file shown in FIG.

  Next, in step B4, the mobile client # 1 (202-1) transmits an INVITE request message (call request message) to the signaling server # 1 (203-1). This INVITE request message is addressed to the mobile client # 2 (202-2) and includes the ID of the mobile client # 2 (201-2).

  Next, in step B5, the signaling control unit # 1 (301-1) makes an acquisition request for the ID of the signaling server (203) to which the mobile client # 2 (201-2) is connected (expected). , To the server status acquisition unit (308) of the signaling server # 1 (203-1).

  Next, in step B6, the server status acquisition unit (308) searches the database (204) for the ID of the signaling server (203) associated with the ID of the mobile client # 2 (202-2). In this process, the ID of the signaling server (203) to which the mobile client # 2 (201-2) is connected cannot be acquired (the mobile client # 2 (201-2) cannot connect to any signaling server (203)). Not because).

  Next, in step B7, the signaling control unit # 1 (301-1) sends an information acquisition request for the optimal signaling server (203) to the server state evaluation unit (309) of the signaling server # 1 (203-1). ).

  Next, in step B8, the server state evaluation unit (309) acquires information of each signaling server (203) from the database (204). The server state evaluation unit (309) determines the optimum signaling server (203) from the acquired information, and acquires the ID, IP address, and port number of the determined signaling server (203). The “optimal signaling server (203)” is a signaling in which the load applied to the signaling server (203) is lower than a predetermined load (load information) among the plurality of signaling servers (203) included in the communication control system of the present embodiment. It refers to the server (203). Information on the predetermined load can be set as appropriate. In this process, it is assumed that the optimum signaling server (203) is the signaling server # 2 (203-2).

  Next, in step B9, the signaling control unit # 1 (301-1) transmits an INVITE request message to the message transmission unit (304) of the signaling server # 1 (203-1). The message transmission unit (304) transmits an INVITE request message to the signaling server # 2 (203-2), and transmits a message related to the completion of transmission processing to the signaling control unit # 1 (301-1).

  Next, in step B10, the message receiving unit (305) of the signaling server # 2 (203-2) receives the INVITE request message. The received INVITE request message is passed to the signaling control unit # 2 (301-2). The signaling control unit # 2 (301-2) is a signaling control unit (301) (see FIG. 2) included in the signaling server # 2 (203-2).

  Next, in step B11, the signaling control unit # 2 (301-2) stores the INVITE request message in the storage unit, and push notification request message for performing push notification to the mobile client # 2 (202-2). Is transmitted to the push notification unit (302) of the signaling server # 2 (203-2).

  Next, in step B12, the push notification unit (302) transmits a push notification request message to the push communication service (201), and transmits a message regarding transmission processing completion to the signaling control unit # 2 (301-2). To do. Thereby, the push notification is executed to the mobile client # 2 (202-2). By the push notification, the IP address of the signaling server # 2 (203-2), the port number, and the Call-ID of the INVITE request are notified to the mobile client # 2 (202-2).

  Next, in step B13, the mobile client # 2 (202-2) receives a push notification from the push communication service (201).

  Next, in step B14, the mobile client # 2 (202-2) connects to the signaling server # 2 (203-2) notified by the push notification and transmits a REGISTER request message. In the X-Call-ID header of the REGISTER request message, the Call-ID (in the INVITE request) included in the push notification is set.

  Next, in step B15, when the signaling control unit # 2 (301-2) receives the REGISTER request message from the mobile client # 2 (202-2), it sends a 200 / REGISTER response message corresponding to the REGISTER request message to the mobile. Send to client # 2 (202-2). Further, the signaling control unit # 2 (301-2) stores the ID and connection information of the mobile client # 2 (202-2) in its storage unit.

  Next, in step B16, the signaling control unit # 2 (301-2) notifies the server state notification unit # 2 (307-2) of the ID of the mobile client # 2 (202-2). The server status notification unit # 2 (307-2) is a server status notification unit (307) (see FIG. 2) included in the signaling server # 2 (203-2).

  Next, in step B17, server state notifying unit # 2 (307-2) associates the ID of mobile client # 2 (202-2) with the ID of signaling server # 2 (203-2) in the database ( 204).

  Next, in step B18, the signaling control unit # 2 (301-2) searches for an INVITE request message that matches the X-Call-ID of the REGISTER request message, and uses the extracted INVITE request message as the mobile client # 2 ( 202-2). Mobile client # 2 (202-2) receives the INVITE request message (incoming call).

  According to the operation shown in FIG. 6, it is possible to establish communication between the mobile clients (202) via the signaling server (203) having the optimum state.

  As shown in FIG. 7, the operation of the mobile client (202) that has received the push communication is as follows. This operation corresponds to the detailed steps B13 and B14 of FIG. This operation starts from step C1.

  In step C1, the mobile client (202) receives a push notification from the push communication service (201). The message in the push notification is shown, for example, as a file described by JavaScript Object Notation shown in FIG. As shown in FIG. 8, the message in the push notification includes the IP address (reference numeral 81), the port number (reference numeral 82) of the signaling server (203) that made the push notification, and the Call-ID (reference numeral 83) of the INVITE request. Including.

  Next, in step C2, the mobile client (202) passes the push notification to the push receiving unit (401). The push receiving unit (401) interprets the message included in the push notification. If this message is a REGISTER transmission request message, the IP address and port number of the signaling server (203) that made the push notification are acquired from the message.

  Next, in step C3, the push receiving unit (401) edits the server address editing request for changing the IP address and port number of the signaling server (203) held in the mobile client (202). Part (403).

  Next, in step C4, the server address editing unit (403) determines the IP address and port number of the signaling server (203) held inside the mobile client (202) based on the message included in the push notification. Change the IP address and port number. The server address editing unit (403) transmits a message regarding the change processing completion to the push receiving unit (401).

  Next, in step C5, the push receiver (401) requests the signaling controller (405) to transmit a REGISTER request message. At this time, the push receiver (401) notifies the signaling controller (405) of the value (Call-ID of the INVITE request) to be set in the REGISTER X-Call-ID based on the message included in the push notification.

  Next, in step C6, the signaling control unit (405) requests the IP address and port number of the signaling server (203) from the server address acquisition unit (404).

  Next, in step C7, the server address acquisition unit (404) acquires the IP address and port number of the signaling server (203) held in the mobile client (202). The server address acquisition unit (404) transmits a message regarding acquisition processing completion to the signaling control unit (405).

  Next, in step C8, the signaling control unit (405) creates REGISTER. At this time, the X-Call-ID notified from the push receiving unit (401) is set in REGISTER. The signaling control unit (405) transmits a REGISTER request to the signaling server (203) corresponding to the IP address and port number acquired in step C7.

  According to the operation shown in FIG. 7, the mobile client (202) can realize the operation shown in FIG.

According to the first embodiment, by evaluating the state of the signaling server (203), it is possible to select an appropriate signaling server (203) to which the mobile client (202) connects and executes session processing. Further, by actively notifying the information of the selected signaling server (203) by push notification, the signaling server (203) to which the mobile client (202) is connected can be directly controlled from the signaling server (203) side. it can. Such a method eliminates load balancing techniques such as conventional DNS (Domain Name Server) round robin, load balancer, and clustering.
Accordingly, it is possible to realize cost reduction, simplification, and shortening of construction time of the client server system that executes load distribution.

<< Second Embodiment >>
The second embodiment of the present invention will be described mainly with respect to differences from the first embodiment. Except for special circumstances, the description overlapping the first embodiment is omitted. The configuration of the communication control system of the second embodiment is the same as that of the first embodiment (see FIG. 1).

  As shown in FIG. 9, the signaling server (203) is similar to the first embodiment in that the signaling control unit (301), the push notification unit (302), the inter-signaling server communication unit (303), and the signaling server management Part (306).

  The inter-signaling server communication unit (303) includes a connection disconnection unit (601) in addition to the message transmission unit (304) and the message reception unit (305) of the first embodiment.

  The connection disconnecting unit (601) disconnects the connection established between its own signaling server (203) and the mobile client (202).

  As shown in FIG. 10, the operation when the communication control system of this embodiment starts a call between mobile clients # 1 and # 2 (202-1 and 202-2) is as follows. However, the mobile client # 1 (202-1) is connected to the signaling server # 1 (203-1), and the mobile client # 2 (202-2) is connected to the signaling server # 3 (203-3). Assume that the connection is maintained. Further, it is assumed that the signaling server (203) appropriate for the session processing is the signaling server # 2 (203-2). In addition, SIP is used for the session control message. This operation starts from step D1.

  Step D1 to Step D8 are the same as Step B1 to Step B8, respectively. However, in step D6 corresponding to step B6, in this process, when the server status acquisition unit (308) searches the database (204) for the ID of the signaling server (203), the signaling server # 3 (203-3) Return the ID of.

  In step D9, the signaling control unit # 1 (301-1) sends a disconnection request message for disconnecting the connection between the signaling server # 3 (203-3) and the mobile client # 2 (202-2). And transmitted to the connection disconnection unit # 1 (601-1). Connection disconnection unit # 1 (601-1) is a connection disconnection unit (601) (see FIG. 9) included in signaling server # 1 (203-1).

  In step D10, connection disconnection unit # 1 (601-1) notifies ID of mobile client # 2 (202-2) to connection disconnection unit # 3 (601-3) (second connection disconnection unit). . The connection disconnection unit # 3 (601-3) is a connection disconnection unit (601) (see FIG. 9) included in the signaling server # 3 (203-3).

  In step D11, connection disconnection unit # 3 (601-3) disconnects the connection associated with the ID of mobile client # 2 (202-2). The connection disconnection unit # 3 (601-3) notifies the connection disconnection unit # 1 (601-1) of the completion of the disconnection, and the connection disconnection unit # 1 (601-1) sends a message regarding the disconnection processing completion to the signaling unit. Transmit to control unit # 1 (301-1).

In step D12, the connection on the mobile client # 2 (202-2) side is disconnected.
Thereafter, in this process, the processes of Step B9 to Step B18 shown in FIG. 6 are executed.

  According to the second embodiment, in combination with the first embodiment, the mobile client (202) connected to the signaling server (203) having a high load is connected to the signaling server (203) having a low load. You can fix it. Therefore, the performance of the entire communication system can be improved.

(Modification)
(1) In the first and second embodiments, SIP is used as the session control message, but other protocols such as HTTP (Hypertext Transfer Protocol) may be used.

  (2) The format of the file indicating the server status may be described by JavaScript Object Notation as shown in FIG. 5, but another format such as XML (eXtensible Markup Language) may be used. The server state elements are not limited to those shown in FIG. 5, and other elements may be added. As for the message in the push notification shown in FIG. 8, the format of the file can use another format such as XML instead of JavaScript Object Notation.

  (3) In the first and second embodiments, a mobile client is targeted as a client of the server client system, but a PC (Personal Computer) client capable of receiving a push notification can also be targeted.

(4) As a result of evaluating the server state in step B8 (FIG. 6), there may be a plurality of optimal signaling servers (203). In this case, the server state evaluation unit (309) or the signaling control unit (301) that controls the server state evaluation unit (309) may select one of a plurality of optimal signaling servers (203). it can. As a selection method, for example, it may be random, or when the priority is set for each of the signaling servers (203) and there are a plurality of optimum signaling servers (203), the one having the highest priority is optimal. It may be a signaling server (203).
By adopting such a method, it is possible to reliably identify one signaling server (203) that receives the REGISTER request message from the mobile client (202) notified of the push.

(5) In the first and second embodiments, the signaling server (203) that receives the REGISTER request message from the destination mobile client (202) that is determined to be optimal with a small load, and the destination mobile client (202) ) Is the same signaling server (203) that performs push notification. However, both signaling servers (203) may be separate servers. In other words, the signaling server (203) that performs push notification to the mobile client (202) on the called side determines which server (theoretically, the load is small and optimal) among the plurality of signaling servers (203) of the communication control system. The signaling server (203) that receives the REGISTER request message from the called mobile client (202) is excluded).
Here, an example of the push notification process is changed as follows in Step B11 and Step B12 of FIG.
In the change process related to Step B11 in FIG. 6, the signaling control unit # 2 (301-2) stores the INVITE request message in the storage unit, and performs a push notification to the mobile client # 2 (202-2). The notification request message is transmitted to the push notification unit (302) other than the signaling server # 2 (203-2). An example of the signaling server other than the signaling server # 2 (203-2) is the signaling server # 1 (203-1), the signaling server # 3 (203-3), or the signaling server # 4 (not shown) in FIG. Etc.
In the change process related to step B12 in FIG. 6, the push notification unit (302) transmits a push notification request message to the push communication service (201), and transmits a message regarding the completion of the transmission process to the signaling server # 2 (203-2). To the signaling control unit # 2 (301-2).

  (6) In the first and second embodiments, the database (204) has been described as being stored in a device different from any of the plurality of signaling servers (203) included in the communication control system. However, the database (204) may be stored in any of the plurality of signaling servers (203) included in the communication control system.

  (7) In this specification, IP telephone is mainly used as a communication service, but the present invention can also be applied to other types of communication services (for example, content distribution such as audio and video).

  In addition, it is possible to realize a technique in which various techniques described in this embodiment are appropriately combined. In addition, the software configuration described in the present embodiment can be realized as hardware. In addition, specific configurations of hardware, software, and the like can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 201 Push notification service 202 Mobile client 203 Signaling server 204 Database 301 Signaling control part 302 Push notification part 303 Inter-signaling server communication part 304 Message transmission part 305 Message reception part 306 Signaling server management part 307 Server state notification part 308 Server state acquisition part 309 Server state evaluation unit 310 Server state notification timer 401 Push reception unit 402 Server address management unit 403 Server address editing unit 404 Server address acquisition unit 405 Signaling control unit 601 Connection disconnection unit

Claims (17)

A communication control system having a plurality of communication control devices,
The first communication control device
Receive connection request information from the first terminal,
A first signaling control unit configured to transmit to a second communication control device lower than predetermined load information among the plurality of communication control devices;
The second communication control device
Receiving the connection request information from the first communication control device;
Perform the push notification process to the second terminal and the terminal information registration process from the second terminal, register the second terminal information,
A communication control system, comprising: a second signaling control unit that transmits the connection request information to the second terminal. A communication control system having a plurality of communication control devices,
The first communication control device
Receive connection request information from the first terminal,
A first signaling control unit configured to transmit to a second communication control device lower than predetermined load information among the plurality of communication control devices;
The second communication control device
Receiving the connection request information from the first communication control device;
Execute terminal information registration processing from the second terminal, register the second terminal information,
A second signaling control unit for transmitting the connection request information to the second terminal;
The push notification communication control device different from the second communication control device is:
A communication control system comprising: a third signaling control unit that executes a push notification process to the second terminal in response to a request from the second communication control device. A communication control system according to claim 1 or 2, wherein
When the second terminal is connected to a third communication control device,
The first communication control device
In the first signaling control unit, after receiving the connection request information from the first terminal, until the connection request information is transmitted to the second communication control device,
Determining that the second communication control device, which is lower than predetermined load information among the plurality of communication control devices, is different from the third communication control device;
A first connection disconnection processing unit for transmitting disconnection request information of the second terminal to the third communication control device;
The third communication control device
A communication control system comprising: a second connection disconnection processing unit that receives disconnection request information from the first communication control device and disconnects the connection between the third communication control device and the second terminal. A communication control system according to any one of claims 1 to 3, wherein
When there are a plurality of second communication control devices lower than the predetermined load information,
The first communication control apparatus includes a selection processing unit that selects one second communication control apparatus. The communication control system according to any one of claims 1 to 4, wherein
The connection request information is an INVITE request message,
The terminal information registration process is a terminal information registration process based on a REGISTER request message.
A communication control system characterized by that. A communication control method in a communication control system having a plurality of communication control devices,
The first communication control device is
Receive connection request information from the first terminal,
A first signaling control step of transmitting to a second communication control device lower than predetermined load information among the plurality of communication control devices;
The second communication control device is
Receiving the connection request information from the first communication control device;
Perform the push notification process to the second terminal and the terminal information registration process from the second terminal, register the second terminal information,
A communication control method comprising a second signaling control step of transmitting the connection request information to the second terminal. A communication control method in a communication control system having a plurality of communication control devices,
The first communication control device is
Receive connection request information from the first terminal,
A first signaling control step of transmitting to a second communication control device lower than predetermined load information among the plurality of communication control devices;
The second communication control device is
Receiving the connection request information from the first communication control device;
Execute terminal information registration processing from the second terminal, register the second terminal information,
A second signaling control step of transmitting the connection request information to the second terminal;
The push notification communication control device different from the second communication control device is:
A communication control method comprising a third signaling control step of executing a push notification process to the second terminal in response to a request from the second communication control device. A computer as a communication control device that is one of a plurality of communication control devices included in the communication control system,
When functioning as the first communication control device,
Receive connection request information from the first terminal,
Function as a first signaling control unit for transmitting to a second communication control device lower than predetermined load information among the plurality of communication control devices,
When functioning as the second communication control device,
Receiving the connection request information from the first communication control device;
Perform the push notification process to the second terminal and the terminal information registration process from the second terminal, register the second terminal information,
Second signaling control means for transmitting the connection request information to the second terminal;
Communication control program to function as A computer as a communication control device that is one of a plurality of communication control devices included in the communication control system,
When functioning as the first communication control device,
Receive connection request information from the first terminal,
Function as a first signaling control unit for transmitting to a second communication control device lower than predetermined load information among the plurality of communication control devices,
When functioning as the second communication control device,
Receiving the connection request information from the first communication control device;
Execute terminal information registration processing from the second terminal, register the second terminal information,
Function as a second signaling control unit that transmits the connection request information to the second terminal;
When functioning as a push notification communication control device different from the second communication control device,
A third signaling control unit that executes a push notification process to the second terminal in response to a request from the second communication control device;
Communication control program to function as A communication control program according to claim 8 or 9, wherein
The second terminal is connected to a third communication control device; and
When functioning as the first communication control device,
In the first signaling control unit, after receiving the connection request information from the first terminal, until the connection request information is transmitted to the second communication control device,
Determining that the second communication control device, which is lower than predetermined load information among the plurality of communication control devices, is different from the third communication control device;
Causing the third communication control device to function as a first connection disconnection processing unit that transmits disconnection request information of the second terminal;
When functioning as a third communication control device,
A communication control program that receives disconnection request information from the first communication control device and functions as a second connection disconnection processing unit that disconnects the connection between the third communication control device and the second terminal. . A communication control program according to any one of claims 8 to 10,
A plurality of second communication control devices lower than the predetermined load information, and
When functioning as the first communication control device,
A communication control program that functions as a selection processing unit that selects one second communication control device. A communication control program according to any one of claims 8 to 11,
The connection request information is an INVITE request message,
The terminal information registration process is a terminal information registration process based on a REGISTER request message.
A communication control program characterized by the above. A communication control device that is one of a plurality of communication control devices included in the communication control system,
When functioning as the first communication control device,
Receive connection request information from the first terminal,
A first signaling control unit configured to transmit to a second communication control device lower than predetermined load information among the plurality of communication control devices;
When functioning as a second communication control device,
Receiving the connection request information from the first communication control device;
Perform the push notification process to the second terminal and the terminal information registration process from the second terminal, register the second terminal information,
A second signaling control unit for transmitting the connection request information to the second terminal;
A communication control device. A communication control device that is one of a plurality of communication control devices included in the communication control system,
When functioning as the first communication control device,
Receive connection request information from the first terminal,
A first signaling control unit configured to transmit to a second communication control device lower than predetermined load information among the plurality of communication control devices;
When functioning as a second communication control device,
Receiving the connection request information from the first communication control device;
Execute terminal information registration processing from the second terminal, register the second terminal information,
A second signaling control unit for transmitting the connection request information to the second terminal;
When functioning as a push notification communication control device different from the second communication control device,
A communication control apparatus comprising: a third signaling control unit that executes a push notification process to the second terminal in response to a request from the second communication control apparatus. A communication control device according to claim 13 or claim 14, wherein
The second terminal is connected to a third communication control device; and
When functioning as the first communication control device,
In the first signaling control unit, after receiving the connection request information from the first terminal, until the connection request information is transmitted to the second communication control device,
Determining that the second communication control device, which is lower than predetermined load information among the plurality of communication control devices, is different from the third communication control device;
A first connection disconnection processing unit for transmitting disconnection request information of the second terminal to the third communication control device;
When functioning as the third communication control device,
A communication control apparatus comprising: a second connection disconnection processing unit that receives disconnection request information from the first communication control apparatus and disconnects the connection between the third communication control apparatus and the second terminal. The communication control device according to any one of claims 13 to 15,
A plurality of second communication control devices lower than the predetermined load information, and
When functioning as the first communication control device,
A communication control apparatus comprising: a selection processing unit that selects one second communication control apparatus. The communication control device according to any one of claims 13 to 16,
The connection request information is an INVITE request message,
The terminal information registration process is a terminal information registration process based on a REGISTER request message.
A communication control device.

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