KR100634209B1 - SPI-based presence server and control method thereof - Google Patents

Abstract

The present invention relates to a presence server and a control method thereof. In particular, the present invention relates to a SIP-based presence server capable of providing a stable presence service and a control method thereof.

As a technical means for achieving the above object, a first aspect of the present invention provides a database for storing status information and subscription information, and storing, updating, reading, and deleting status information and subscription information in the database. A presence server including a presence server processor that performs agent communication is provided.

The SIP-based presence server and its control method according to the present invention have the effect of improving the performance and stability of the server by storing and managing transaction information and subscription information in a separate database server.

Presence server, event driven presence server, sip

Description

SPI-based presence server and its control method {PRESENCE SERVER BASED ON SIP AND CONTROL METHOD FOR THE SAME}

1 is a diagram schematically illustrating a structure of a presence server according to an embodiment of the present invention.

2 is a diagram illustrating each step of a method of recovering a previous state when the presence server is down or restarted due to a power failure.

3 is a view for explaining an example of the generation and processing of the user policy event when the user policy event is generated and the decision of the user is allowed.

FIG. 4 is a diagram for explaining an example of a process and a process of generating a user policy event when a user policy event is generated and a decision of a user is not allowed.

FIG. 5 is a diagram illustrating an example of a procedure of receiving and processing an event when a SIP message, which is a network event, is received. FIG. 5 is a diagram illustrating a processing procedure when a "SUBSCRIBE" message, which is a subscription request, is received from an unauthorized user.

FIG. 6 is a diagram illustrating an example of a procedure of receiving and processing an event when a SIP message, which is a network event, is received. FIG. 6 is a diagram illustrating a processing procedure when a "SUBSCRIBE" message, which is a subscription request, is received from an authorized user.

FIG. 7 is a diagram illustrating an example of a procedure for receiving and processing an event when a SIP message, which is a network event, is received. FIG. 7 is a diagram illustrating a processing procedure when a message “PUBLISH” for transmitting user status information is received.

FIG. 8 is a diagram illustrating an example of a procedure for receiving and processing an event when a SIP message, which is a network event, is received. In case of receiving a “200” response indicating that “NOTIFY” has been successfully delivered and processed. It is a figure which shows a processing procedure.

FIG. 9 is a diagram illustrating an example of a procedure of receiving and processing an event when a SIP message, which is a network event, is received. FIG.

FIG. 10 is a diagram illustrating an example of a procedure for receiving and processing an event when a timeout event occurs. FIG.

FIG. 11 is a diagram illustrating an example of a procedure for receiving and processing an event when a timeout event occurs. FIG.

12 is a diagram illustrating an example of a procedure for receiving and processing an event when a timeout event occurs, and a processing procedure when the presence server transmits "NOTIFY" but does not receive a "200" response from the presence user agent. It is a figure which shows.

The present invention relates to a presence server and a control method thereof. In particular, the present invention relates to a SIP-based presence server capable of providing a stable presence service and a control method thereof.

Session Initiation Protocol (SIP) is a protocol defined by the Internet Engineering Task Force (IETF), which provides functions such as call setup, call information modification, and call termination between users by finding a counterpart to communicate to provide Internet telephony services. Call control protocol. SIP's low complexity and scalability make it ideal for Internet telephony, instant messaging and presence services, and conference services.

The presence service receives and stores state information and delivers the state information when requested by a user registered as a subscriber. The status information may include, for example, information about whether a specific user is online or offline, whether the specific user has a possibility of communication, instant messaging, voice on IP (VoIP), mobile phone, email, games, and the like. Information about whether there is a willingness to communicate with the user, and whether there is communication capability such as voice mail capability, video capability, and mobility. The presence server, also called a presence agent server (PAS), is a server that provides presence services to users.

Conventional presence servers generally maintain only state information in a database, and SIP subscription information is maintained in volatile memory, such as random access memory (RAM), for example process memory, until all of the corresponding subscriptions in the process are terminated. It is managed within the process. However, the presence server often generates and destroys a large amount of subscription information. In this case, there is a problem in that memory management is difficult and performance decreases in proportion to the number of users and the number of subscriptions. In addition, when the server is down or restarted due to a power failure, all the subscription information disappears, which causes a problem in the service such as all the clients connected to the existing need to sign up again. In addition, in this process, if all the subscriptions require re-subscription at one time, the load of the server may exceed the limit. In this case, the subscription means a procedure for obtaining the partner's status information. The subscription information includes the information of "From", "To", "Call-ID", and "CSeq" headers included in the SIP message and the status of the subscription. The value of the "Subscription_state" header to be expressed is included, and subscription information is updated each time a SIP message is transmitted and received.

Accordingly, an object of the present invention is to solve the above-described problem, and an object of the present invention is to store and manage subscription information in a separate database server, thereby improving the performance and stability of a server based SIP server and its control method To provide.

As a technical means for achieving the above object, a first aspect of the present invention provides a database for storing status information and subscription information, and storing, updating, reading, and deleting status information and subscription information in the database. A presence server including a presence server processor that performs agent communication is provided.

According to a second aspect of the present invention, there is provided a method of restarting a presence server including a database storing state information and subscription information, wherein the presence server is configured to determine a difference between a current time and a last access time recorded in the database. Calculating, distinguishing a valid presence user agent from an invalid presence user agent by subtracting the calculated difference from a valid time of subscription information recorded in the database, wherein the presence server is not valid Sending a message informing the presence user agent that it has been terminated; And deleting subscription information of the invalid presence user agent from the database.

A third aspect of the present invention provides a method of controlling a presence server including a database storing state information and subscription information, wherein the presence server knows a state of a second presence user agent of a first presence user agent. Receiving a subscription request for requesting, the presence server searching the database to confirm whether the second presence user agent is authorized for the first presence user agent, and the second presence in the database. If there is no information on whether the presence user agent is authorized for the first presence user agent, the presence server notifying the first presence user agent that there is no status information of the second presence user agent; And the presence server stores the first presence in the database. The agents of that second presence provides a presence server control method comprising: storing subscription information of the user agent.

A fourth aspect of the present invention provides a method of controlling a presence server including a database for storing status information and subscription information, wherein the presence server receives status information from a second presence user agent. Storing, by the presence server, the received status information in the database, wherein the presence server reads from the database that there is a first presence user agent as a presence genetic agent subscribed to the second presence user agent. Step, the presence server delivering status information of the second presence user agent to the first presence user agent, and the presence server of the first presence user agent stored in the database. Updating the subscription information for the second presence user agent; A control method of a presence server including a system is provided.

A fifth aspect of the present invention provides a method of controlling a presence server including a database storing state information and subscription information, wherein the presence server detects that the valid time of the state information of the second presence user agent has elapsed. And the presence server reading from the database that there is a first presence user agent as a presence user agent subscribed to the second presence user agent, wherein the presence server is responsible for the first presence user. Notifying an agent that the second presence user agent is offline, updating, by the presence server, subscription information for the second presence user agent of the first presence user agent stored in the database; The presence server stored in the database A method of controlling a presence server comprising updating status information of a second presence user agent.

According to a sixth aspect of the present invention, there is provided a method of controlling a presence server including a database storing state information and subscription information, wherein the presence server detects that a subscription valid time has elapsed. Reading from the database that the user agent whose subscription expiration date has passed is a first presence user agent, wherein the presence server notifies the first presence user agent that the subscription has ended, and the presence server provides the data It provides a control method of the presence server comprising the step of deleting the subscription information of the first presence user agent stored in the base.

According to a seventh aspect of the present invention, in a method of controlling a presence server including a database storing state information and subscription information, the presence server repeatedly delivers a message to the first presence user agent a predetermined number of times. Nevertheless, receiving a confirmation response, and the presence server provides a control method of the presence server comprising the step of deleting the subscription information of the first presence user agent in the database.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. Embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

1 is a diagram schematically illustrating a structure of a presence server according to an embodiment of the present invention.

Referring to FIG. 1, the presence server 100 includes a presence server processor 110 and a database 120. The presence server processor 110 performs SIP-based communication with the presence user agent 200. In addition, the presence server processor 110 stores not only status information, but also subscription information in the database 120, and reads and uses the corresponding information according to an event occurrence. The database 120 stores a state information and subscription information.

The presence server processor 110 includes an event manager 130 and an event handler 140. Event manager 130 includes a user policy event manager 131, a network event manager 132, a timeout event manager 133, and the event handler 140 includes a user policy event handler 141, a network event handler. 142, a timeout event handler 143. This configuration of the presence server processor 110 may be a physical configuration, or may be a logical configuration, that is, a configuration divided into various functions performed by one processor.

The user policy event manager 131 detects an event for allowing or disallowing the delivery of the specific information of the specific user with respect to the subscription request for obtaining the specific information of the specific user, and sends the event to the user policy event handler 141. Inform the occurrence of. When the user policy event occurs, the user policy event handler 141 performs an operation according to whether the user decision is allowed or disallowed.

The network event manager 132 detects an event on the network, that is, an event generated when the SIP message is received, and notifies the network event handler 142 of the occurrence of the event. When a network event occurs, the network event handler 142 determines whether the type of the SIP message is a request or a response, and performs the processing accordingly.

The timeout event manager 133 detects an event when the user status information and subscription information in the database 120 timed out and notifies the timeout event handler 143 of occurrence of the corresponding event. When the timeout event occurs, the timeout event handler 143 receives a timeout event when the subscription validity time elapses, when the validity time of the user information has elapsed, and when the message is transmitted, responds accordingly after a predetermined time. It determines whether any of the cases is not received within the time period, and performs the processing accordingly.

2 is a diagram illustrating each step of a method of recovering a previous state when the presence server is down or restarted due to a power failure.

Referring to FIG. 2, first, the presence server finds the last access time recorded in the database, calculates a difference from the current time, and calculates the difference from the effective time of the subscription information recorded in the database. By subtracting the time difference, a valid presence user agent and an invalid presence user agent are distinguished (S11). If there is an invalid presence user agent, that is, a presence user agent whose subscription information has expired, the presence server notifies the presence user agent PUA1 that it has finished by notifying that it has finished (S12). ). When receiving a receipt confirmation message from the presence user agent PUA1 (S13), the presence server deletes the subscription information recorded in the database, and maintains the subscription information of the valid presence user agent PUA2 (S14). .

3 is a view for explaining an example of the generation and processing of the user policy event when the user policy event is generated and the decision of the user is allowed.

Referring to FIG. 3, first, a first presence user agent PUA1 transmits a “SUBSCRIBE” message to request subscription to obtain status information of a second presence user agent PUA2 (S21). The presence server searches the internal database to confirm whether the second presence user agent PUA2 is authorized (S22). If there is no authorization policy information for the second presence user agent PUA2 in the database, a "202 (pending)" response indicating that authorization is pending is transmitted to the first presence user agent PUA1 (S23). In addition, the presence server transmits "NOTIFY" to the first presence user agent PUA1, and does not include the state information of the second presence user agent PUA2 (S24). The first presence user agent PUA1 transmits a "200" response of acknowledgment to "NOTIFY" to inform that it has received the message well (S25). The presence server stores information related to subscription in the database (S26). When a user policy event that allows authorization from the second presence user agent PUA2 to the first presence user agent PUA1 occurs (S27), the presence server sets "NOTIFY" to the first presence user agent ( PUA1) (S28). At this time, "NOTIFY" includes status information of the second presence user agent PUA2. The first presence user agent PUA1 sends a "200" response of acknowledgment to inform that "NOTIFY" has arrived safely (S29). The presence server receiving the response "200" updates the subscription information in the database.

FIG. 4 is a diagram for explaining an example of a process and a process of generating a user policy event when a user policy event is generated and a decision of a user is not allowed.

Referring to FIG. 4, first, the first presence user agent PUA1 transmits “SUBSCRIBE” to request subscription to obtain status information of the second presence user agent PUA2 (S31). The presence server searches for an internal database in order to confirm whether the corresponding user is authorized (S32). If there is no authorization policy information for the second presence user agent PUA2 in the database, a "202 (pending)" response indicating that authorization is pending is transmitted to the first presence user agent PUA1 (S33). In addition, the presence server transmits "NOTIFY" to the first presence user agent PUA1, and does not include the state information of the second presence user agent PUA2 (S34). The first presence user agent PUA1 transmits a "200" response of acknowledgment to "NOTIFY" to inform that it has received the message well (S35). The presence server stores information related to subscription in the database (S36). When a user policy event disallowing authorization for the first presence user agent PUA1 from the second presence user agent PUA2 occurs (S37), the presence server notifies that the subscription has been terminated. Is sent to the first presence server PUA1. The first presence server PUA1 sends a "200" response of acknowledgment to inform that "NOTIFY" has arrived safely. Delete the subscription information stored in the database that received the response "200".

FIG. 5 is a diagram illustrating an example of a procedure of receiving and processing an event when a SIP message, which is a network event, is received. FIG. 5 is a diagram illustrating a processing procedure when a "SUBSCRIBE" message, which is a subscription request, is received from an unauthorized user.

Referring to FIG. 5, when a first event user agent PUA1 delivers "SUBSCRIBE" to request a subscription to obtain status information of the second presence user agent PUA2 (S41). In step S42, the presence server searches an internal database to confirm whether the second presence user agent PUA2 is authorized. If there is no authorization policy information for the second presence user agent PUA2 in the database, a "202 (pending)" response waiting for authorization is transmitted to the first presence user agent PUA1 (S43). In addition, the presence server transmits "NOTIFY" to the first presence user agent PUA1, and does not include the state information of the second presence user agent PUA2 (S44). The first presence user agent PUA1 transmits a "200" response of acknowledgment to "NOTIFY" to inform that it has received the message well (S45). The presence server stores information related to subscription in the database (S46).

FIG. 6 is a diagram illustrating an example of a procedure of receiving and processing an event when a SIP message, which is a network event, is received. FIG. 6 is a diagram illustrating a processing procedure when a "SUBSCRIBE" message, which is a subscription request, is received from an authorized user.

Referring to FIG. 6, first, when a second event user agent PUA2 delivers "SUBSCRIBE" and requests a subscription to obtain status information of the second presence user agent PUA2 (S51). ). The presence server searches the internal database to confirm whether the second presence user agent PUA2 is authorized (S52). If the database has already been authorized for the first presence user agent PUA1 of the second presence user agent PUA2, the presence server has given the first presence user agent PAU1 a "200". Pass the response (S53). The presence server transfers the state information of the second presence user agent PUA2 to the first presence user agent PUA1 in the message "NOTIFY" (S54). The first presence user agent PUA1 transmits a "200" response of acknowledgment of "NOTIFY" to inform that it has received the message well (S55). The presence server stores information related to subscription in the database (S56).

FIG. 7 is a diagram illustrating an example of a procedure for receiving and processing an event when a SIP message, which is a network event, is received. FIG. 7 is a diagram illustrating a processing procedure when a message “PUBLISH” for transmitting user status information is received.

Referring to FIG. 7, first, when an event for delivering status information to a presence server through a "PUBLISH" message occurs at the second presence user agent PUA2 (S61), the presence server receives the received message. The state information is recorded in the database (S62). The presence server sends a "200" response of acknowledgment to the second presence user agent PAU2 to inform that the processing for "PUBLISH" is completed (S63). All subscription information related to the second presence user agent PUA2 is retrieved (S64). There are two in this embodiment. For each subscription, it sends a "NOTIFY" message that contains the changed user status information. That is, it sends a "NOTIFY" message to the third presence user agent PUA3 (S65), and receives a "200" response of acknowledgment (S66). The updated subscription information is stored in the database (S67). A message “NOTIFY” is sent to the first presence user agent PUA1 (S68), and a “200” response of acknowledgment is received (S69). The updated subscription information is stored in the database (S70).

FIG. 8 is a diagram illustrating an example of a procedure for receiving and processing an event when a SIP message, which is a network event, is received. In case of receiving a “200” response indicating that “NOTIFY” has been successfully delivered and processed. It is a figure which shows a processing procedure.

Referring to FIG. 8, the presence server transmits "NOTIFY" to the first presence user agent PUA1 (S71). When the presence server receives an "200" response of acknowledgment from the first presence user agent PUA1 (S72), the presence server obtains related subscription information from the database (S73). The presence server updates the updated subscription information in the database (S74).

FIG. 9 is a diagram illustrating an example of a procedure of receiving and processing an event when a SIP message, which is a network event, is received. FIG.

Referring to FIG. 9, the presence server transmits "NOTIFY" to the first presence user agent PUA1 (S81). When the presence server receives an event other than "200" from the first presence user agent PUA1 (S82), related subscription information is retrieved from the database (S83). The associated subscription information is deleted from the database (S84).

FIG. 10 is a diagram illustrating an example of a procedure for receiving and processing an event when a timeout event occurs. FIG. 10 is a diagram illustrating a procedure when a state information is deleted after an effective time elapses.

Referring to FIG. 10, if a timeout event that the validity time of the state information of the second presence user agent PUA2 has elapsed is detected, it is detected (S91). The presence server pulls related subscription information from a database. Each presence server sends a " NOTIFY " message to each subscribed presence user agents PUA1 and PUA3 to indicate that the information of the timed out user is no longer valid or offline. S93, S96). Receive a "200" response of acknowledgment from each subscribed presence user agents PUA1 and PUA3 (S94 and S97). When receiving a "200" response, the subscription information recorded in the database is updated (S95 and S98). The state information recorded in the database is also updated (S99).

FIG. 11 is a diagram illustrating an example of a procedure for receiving and processing an event when a timeout event occurs. FIG.

Referring to FIG. 11, a timeout event of a subscription transaction occurs and is detected (S101). The presence server obtains related subscription information from a database (S102). In operation S103, the presence user agent PUA1 transmits a "NOTIFY" message indicating that the subscription is terminated. In step S104, a response “200” is received from the presence user agent. When receiving the "200" response, the subscription information recorded in the database is deleted (S105).

12 is a diagram illustrating an example of a procedure for receiving and processing an event when a timeout event occurs, and a processing procedure when the presence server transmits "NOTIFY" but does not receive a "200" response from the presence user agent. It is a figure which shows.

Referring to FIG. 12, when a 200 response is not received until the number of retransmissions of the presence server exceeds a predetermined number (S111), a timeout event for the corresponding presence user agent PUA1 occurs. The server deletes the subscription information (S112).

Although the technical spirit of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, it will be understood by those skilled in the art that various modifications are possible within the scope of the technical idea of the present invention.

The SIP-based presence server and its control method according to the present invention have the effect of improving the performance and stability of the server by storing and managing transaction information and subscription information in a separate database server.

Claims (14)

A database for storing status information and subscription information; And A presence server processor for storing, updating, reading, and deleting the status information and the subscription information in the database, and performing presence user agent communication; The presence server processor, A user policy event manager configured to detect and notify an event for allowing or disallowing the delivery of the status information of the specific user in response to a subscription request for obtaining the status information of the specific user; A network event manager configured to detect and notify an event occurring when a SIP message is received on a network; A timeout event manager configured to detect and notify an event when at least one of the status information and the subscription information in the database has timed out; A user policy event handler that determines an event notified by the user policy event manager and performs processing; A network event handler that determines an event notified by the network event manager and performs processing; And And a timeout event handler configured to determine and perform an event notified by the timeout event manager. The method of claim 1, The presence server processor performs SIP communication with the presence user agent. The method of claim 1, The presence server processor receives the status information from the presence user agent. The method of claim 1, The presence server processor receives the subscription request message from the presence user agent. The method of claim 1, The presence server processor transfers the status information of another presence user agent to the presence user agent. A presence server comprising a database for storing status information and subscription information, and a presence server processor for storing, updating, reading, and deleting the status information and subscription information in the database and performing presence user agent communication. In the control method of, Calculating, by the presence server processor, a difference between a last access time recorded in the database and a current time; Distinguishing a valid presence user agent from an invalid presence user agent by subtracting the calculated difference from a valid time of subscription information recorded in the database; Sending a message informing the invalid presence user agent that subscription has ended; And Deleting subscription information of the invalid presence user agent from the database. A presence server comprising a database for storing status information and subscription information, and a presence server processor for storing, updating, reading, and deleting the status information and subscription information in the database and performing presence user agent communication. In the control method of, Receiving, by the presence server processor, a subscription request from a first presence user agent to know a second presence user agent status; Searching the database to confirm whether the second presence user agent is authorized for the first presence user agent; Notifying the first presence user agent that there is no status information of the second presence user agent when there is no information on whether the second presence user agent is authorized in the database; And Storing subscription information for the second presence user agent of the first presence user agent in the database. The method of claim 7, wherein Upon receiving a message allowing authorization for the first presence user agent from the second presence user agent, forwarding a message including status information of the second presence user agent to the first presence user agent. Doing; And And updating the subscription information for the second presence user agent of the first presence user agent stored in the database. The method of claim 7, wherein When the second presence user agent receives a message disallowing authorization for the first presence user agent, transmitting a message indicating that the subscription to the first presence user agent has ended; And And deleting the subscription information for the second presence user agent of the first presence user agent stored in the database. The method of claim 7, wherein Delivering status information of the second presence user agent to the first presence user agent when the database has authorization information for the first presence user agent of the second presence user agent. Presence server control method comprising. A presence server comprising a database for storing status information and subscription information, and a presence server processor for storing, updating, reading, and deleting the status information and subscription information in the database and performing presence user agent communication. In the control method of, Receiving, by the presence server processor, user status information from a second presence user agent; Storing the received user state information in the database; Reading from the database that there is a first presence user agent as a presence user agent subscribed to the second presence user agent; Communicating status information of the second presence user agent to the first presence user agent; And Updating subscription information for the second presence user agent of the first presence user agent stored in the database. A presence server comprising a database for storing status information and subscription information, and a presence server processor for storing, updating, reading, and deleting the status information and subscription information in the database and performing presence user agent communication. In the control method of, Detecting, by the presence server processor, that an effective time of state information of a second presence user agent has elapsed; Reading from the database that there is a first presence user agent as a presence user agent subscribed to the second presence user agent; Notifying the first presence user agent that the second presence user agent is offline; Updating subscription information for the second presence user agent of the first presence user agent stored in the database; And Updating status information of the second presence user agent stored in the database. A presence server comprising a database for storing status information and subscription information, and a presence server processor for storing, updating, reading, and deleting the status information and subscription information in the database and performing presence user agent communication. In the control method of, Detecting, by the presence server processor, that a subscription validity time has elapsed; Reading from the database that the user agent whose subscription expiration date has passed is a first presence user agent; Notifying the first presence user agent that the subscription has ended; And Deleting the subscription information of the first presence user agent stored in the database. A presence server comprising a database for storing status information and subscription information, and a presence server processor for storing, updating, reading, and deleting the status information and subscription information in the database and performing presence user agent communication. In the control method of, Not receiving an acknowledgment even if the presence server processor repeatedly delivers a message to a first presence user agent a predetermined number of times; And Deleting the subscription information of the first presence user agent from the database.

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