KR101124821B1 - P-cscf setup system for ims service and p-cscf setup method for ims service - Google Patents

P-cscf setup system for ims service and p-cscf setup method for ims service Download PDF

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KR101124821B1
KR101124821B1 KR20080083984A KR20080083984A KR101124821B1 KR 101124821 B1 KR101124821 B1 KR 101124821B1 KR 20080083984 A KR20080083984 A KR 20080083984A KR 20080083984 A KR20080083984 A KR 20080083984A KR 101124821 B1 KR101124821 B1 KR 101124821B1
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South Korea
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cscf
address information
domain
domain address
terminal device
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KR20080083984A
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Korean (ko)
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KR20100025278A (en
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주상현
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에스케이 텔레콤주식회사
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Abstract

According to the present invention, when a terminal device for using an IMS service requests address information of a P-CSCF for call processing, an IMS capable of providing address information of a normal P-CSCF to a terminal device without call congestion or a failure situation may be provided. A P-CSCF setting system for a service and a P-CSCF setting method for an IMS service are disclosed. In the P-CSCF setting system for the IMS service of the present invention, the DNS server periodically provides a status confirmation message for status checking to at least one P-CSCF, and provides information on whether to reply to the status message. The P-CSCF stores corresponding to each of the at least one P-CSCF and has a predetermined domain name as the DNS server corresponding to the address information provided as a predetermined terminal device requests to open a call to an IP-CAN network. When requesting the domain address information, the DNS server searches for the domain address information of the P-CSCF corresponding to the domain name, and the reply of the response message is based on the corresponding reply information among the found domain address information. And providing the domain address information of the P-CSCF to the terminal device.

IMS, P-CSCF, DNS Server, Call Failure

Description

P-CSF setting system for IMS service and P-CSF setting method for IMS service {P-CSCF SETUP SYSTEM FOR IMS SERVICE AND P-CSCF SETUP METHOD FOR IMS SERVICE}

The present invention relates to a P-CSCF setting system for an IMS service and a P-CSCF setting method for an IMS service, and more particularly, to a terminal device for using an IMS service in order to process address information of a P-CSCF for call processing. If requested, P-CSCF setting system for IMS service that can provide address information of normal P-CSCF without call congestion or failure condition to terminal device, P-CSCF setting method for IMS service and DNS server applied to it And a method for providing P-CSCF domain address information of a DNS server.

Recently, thanks to the development of mobile communication technology, a data packet service is provided to transmit / receive packet data using a protocol multimedia subsystem (IMS) service in association with a mobile communication network. There is an increasing number of terminal devices that can be received.

IMS is a multimedia core based on the All IP concept that is being standardized as a core network system of next generation mobile communication system in 3rd generation partnership project (3GPP) / 3rd generation partnership project 2 (3GPP2). A network subsystem that is configured to enable international global roaming. IMS includes a Call Session Control Function (CSCF) that performs incoming call gateways, call control, serving profile management, address handling functions, and the like. The Call Session Control Function (CSCF) is composed of P-CSCF, S-CSCF, and I-CSCF according to its role and function. Of these, P-CSCF (Proxy- Call Session Control Function) acts as a proxy and a user agent.

Accordingly, in order to use the IMS service through the terminal device, the terminal device accesses a Domain Name System (DNS) server corresponding to the address information obtained through the mobile communication network, and corresponds to a domain name previously owned for the IMS service. The domain address information of P-CSCF is requested to DNS server and provided. Accordingly, the terminal device may use the data packet service through the IMS service by setting up the corresponding P-CSCF based on the domain address information provided from the DNS server and attempting the IMS message.

However, in the related art, when domain address information of a P-CSCF corresponding to a domain name is requested, the DNS server provides N domain address information of the P-CSCF corresponding to a domain name to the terminal device, and the terminal device provides N provided. The service is attempted by sequentially calling the domain address information of the P-CSCF. That is, the terminal apparatus attempts to call any one of the domain address information of the N P-CSCFs, and if there is no response for a predetermined waiting time, retries the call a predetermined number of times, and if it is determined to fail, N P-CSCFs. Attempt to call the domain address information of any one of the domain address information of CSCF.

In the conventional P-CSCF setting method, as described above, failure can be repeated until a P-CSCF with a normal response is found by sequentially attempting to call domain address information of N P-CSCFs provided from a DNS server. Therefore, a problem of increasing user dissatisfaction is expected from a terminal device point of view, and a load and chain call failure problem due to unnecessary call processing is expected from a network point of view.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reach at least one Proxy-Call Session Control Function (P-CSCF) and Internet Protocol Connectivity Access Network (IP-CAN) network. A terminal apparatus for requesting establishment and requesting domain address information of a P-CSCF having a predetermined domain name from a DNS (Domain Name System) server corresponding to the address information provided from the IP-CAN network, and the at least one P At least one domain name and domain address information corresponding to a CSCF, and periodically providing a status confirmation message for status confirmation to the at least one P-CSCF to return information on whether a response message to the status confirmation message is returned. Corresponding to each of the P-CSCFs, and when the domain address information of the P-CSCF having the predetermined domain name is requested from the terminal apparatus, And a DNS server for providing the terminal apparatus with the domain address information of the P-CSCF in which the response message is returned based on the corresponding reply information among the searched domain address information of the P-CSCF. P-CSCF setting system for IMS service and P-CSCF setting method for IMS service, if terminal equipment using IMS service requests address information of P-CSCF for call processing, call congestion or failure It is to provide terminal device with address information of normal P-CSCF without situation.

The present invention was created in view of the above circumstances, and another object of the present invention is to provide domain names and domain address information corresponding to at least one Proxy-Call Session Control Function (P-CSCF) located in an IMS network. The at least one DB management unit for storing the information, a status confirmation message transmission unit periodically providing a status confirmation message for status confirmation to the at least one P-CSCF, and information on whether to reply the response message to the status confirmation message; If the domain address information of the P-CSCF having a predetermined domain name is requested from an external predetermined terminal device in response to each of the P-CSCFs, the P-CSCF corresponding to the domain name is based on the DB management unit. Search for the domain address information of the P-CSCF with the reply of the response message based on the corresponding reply information among the searched domain address information. Providing a method for providing P-CSCF domain address information of a DNS server and a DNS server including a system manager for acquiring domain address information and providing the terminal device to the terminal device, the terminal device for using the IMS service provides a P- When requesting the address information of the CSCF, the terminal device provides the address information of the normal P-CSCF without call congestion or failure condition.

According to a first aspect of the present invention, there is provided a P-CSCF setting system for an IMS service, including: at least one Proxy-Call Session Control Function (P-CSCF); Requests to open a call to an IP-CAN network and a domain name of a P-CSCF having a predetermined domain name as a DNS (Domain Name System) server corresponding to address information provided from the IP-CAN network. A terminal device for requesting information; And storing domain name and domain address information corresponding to the at least one P-CSCF, and periodically providing a status confirmation message for status confirmation to the at least one P-CSCF to provide a response message to the status confirmation message. The reply status information is stored in correspondence with each of the at least one P-CSCF, and when the domain address information of the P-CSCF having the predetermined domain name is requested from the terminal device, the domain address of the P-CSCF corresponding to the domain name. And a DNS server for providing the terminal apparatus with the domain address information of the P-CSCF to which the response message is returned based on the corresponding reply information among the searched domain address information.

Preferably, when the DNS server stores the reply status information of the response message to the status confirmation message corresponding to each of the at least one P-CSCF, the reply time of the response message if there is a reply of the response message. The response time is stored in response to the corresponding P-CSCF, and the response time is stored in the domain address information of the P-CSCF in which the response message retrieved in response to the P-CSCF domain address information request from the terminal apparatus is returned. Priority can be assigned to the terminal device in this fast order.

Preferably, the terminal apparatus attempts an IMS message through a predetermined P-CSCF according to the priority of domain address information provided from the DNS server, and if it is determined that the attempt to the P-CSCF has failed. The IMS message can be attempted through the P-CSCF corresponding to the domain address information in the following priority order.

DNS server according to a second aspect of the present invention for achieving the above object, DB management unit for storing the domain name and domain address information corresponding to at least one Proxy-Call Session Control Function (P-CSCF) located in the IMS network ; A status confirmation message transmission unit periodically providing a status confirmation message for status confirmation to the at least one P-CSCF; Response information of the response message to the status confirmation message is stored in the DB management unit corresponding to each of the at least one P-CSCF, and domain address information of the P-CSCF having a predetermined domain name from an external predetermined terminal device is stored. If requested, retrieves the domain address information of the P-CSCF corresponding to the domain name based on the DB management unit, and the domain address of the P-CSCF to which the response message is returned based on the corresponding reply information among the searched domain address information. And a system manager for acquiring the information and providing the information to the terminal device.

Preferably, the status acknowledgment message transmission unit provides the status acknowledgment message to each of the at least one P-CSCF to measure a reply time at which the response message is returned, and the measured reply time corresponds to the corresponding P-CSCF. It may further include a reply time measurement unit for storing in the DB management unit.

Preferably, the system manager returns a response message from among the domain address information of the P-CSCF retrieved based on the DB manager as the domain address information of the P-CSCF having the domain name is requested from the terminal device. The P-CSCF may obtain domain address information of the P-CSCF, and assign the priority to the obtained P-CSCF in order of quick response time to the terminal device.

Preferably, the system manager returns a response message from among the domain address information of the P-CSCF retrieved based on the DB manager as the domain address information of the P-CSCF having the domain name is requested from the terminal device. The domain address information of the P-CSCF may be obtained, and the obtained domain address information of the P-CSCF may be sequentially provided to the terminal device in order of rapid response time.

Preferably, the DB manager may store a P-CSCF related information table including a domain name, domain address information, reply status information, and reply time corresponding to each of the at least one P-CSCF.

P-CSCF setting method for an IMS service according to a third aspect of the present invention for achieving the above object, the DNS server for storing domain name and domain address information corresponding to at least one P-CSCF is the at least one P Periodically providing a status check message for status check with the CSCF; Storing, by the DNS server, corresponding to each of the at least one P-CSCF, reply information of a response message to the status confirmation message; Requesting domain address information of a P-CSCF having a predetermined domain name to the DNS server corresponding to the address information provided as a predetermined terminal device requests to open a call to an IP-CAN network; If domain address information of the P-CSCF having the predetermined domain name is requested from the terminal device, retrieving domain address information of the P-CSCF corresponding to the domain name by the DNS server; And providing, by the DNS server, the terminal apparatus with the domain address information of the P-CSCF to which the response message is returned based on the corresponding reply information among the searched domain address information.

P-CSCF domain address information providing method of the DNS server according to the fourth aspect of the present invention for achieving the above object, the domain corresponding to at least one Proxy-Call Session Control Function (P-CSCF) located in the IMS network Storing name and domain address information; Periodically providing a status message for status checking with at least one P-CSCF located in an IMS network; Storing reply status information of a response message to the status confirmation message corresponding to each of the at least one P-CSCF; If domain address information of the P-CSCF having a predetermined domain name is requested from an external predetermined terminal device, retrieving domain address information of the P-CSCF corresponding to the domain name; And providing, to the terminal apparatus, domain address information of the P-CSCF to which the response message is returned, based on corresponding reply information among the searched domain address information.

Preferably, the method may further include providing the status confirmation message to each of the at least one P-CSCF to measure a reply time to which the response message is returned, and storing the measured reply time corresponding to the corresponding P-CSCF. can do.

Preferably, the providing of the domain address information to the terminal device includes: assigning priority to the domain address information of the P-CSCF to which the response message is returned in the order of the quickest reply time, to the terminal device. Can provide.

Preferably, the step of providing the domain address information to the terminal device, the domain address information of the P-CSCF with the reply of the response message may be provided to the terminal device sequentially in the order of the reply time is faster. have.

Therefore, according to the P-CSCF setting system for the IMS service and the P-CSCF setting method for the IMS service of the present invention, the DNS server continuously grasps the state of each P-CSCF, and the P-CSCF domain from the terminal device. When requesting access address information, only the normal P-CSCF domain access address information without problems in call processing is provided to the terminal device in consideration of the fast response time, that is, the order of call processing. The IMS service can be used to improve user satisfaction, and the network can minimize the unnecessary call processing to improve the load and chain call failure problems.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a diagram illustrating a P-CSCF setting system for an IMS service according to a preferred embodiment of the present invention.

As shown in FIG. 1, the P-CSCF setting system for an IMS service according to the present invention includes at least one proxy-call session control function (P-CSCF) 221, 222, and 223 and an Internet Protocol Connectivity Access (IP-CAN). Network (210) requests to open a call, and DNS (Domain Name System) server (eg 300) corresponding to the address information provided from the IP-CAN network 210 of the P-CSCF having a predetermined domain name The terminal device 10 requesting the domain address information and the domain name and domain address information corresponding to the at least one P-CSCF (221, 222, 223 ...) are stored, and the at least one P-CSCF (221, 222, 223 ...) is stored. Periodically providing a status check message for status check, and storing information on whether to reply to the status check message in response to each of the at least one P-CSCF (221, 222, 223 ...), and the terminal apparatus 10 Domain address information of P-CSCF When the request is made, the domain address information of the P-CSCF corresponding to the domain name is searched, and the domain address information of the P-CSCF with the reply of the response message is provided to the terminal device based on the corresponding reply information among the found domain address information. DNS server 300 is included.

Here, the terminal device 10 is a terminal device having a structure capable of using an IP Multimedia Subsystem (IMS) service in connection with a mobile communication network supported by the terminal device 10 itself, such as a mobile phone or a PDA. This may be the case.

The IMS 100 is a multimedia core of the All IP concept that is being standardized as a core network system of the next generation mobile communication system in the 3rd Generation Partnership Project (3GPP) / 3rd Generation Partnership Project 2 (3GPP2). Core) A network subsystem that is configured to enable international global roaming. That is, the IMS 100 refers to a signal protocol and environment for call control of multimedia in a 3rd generation network, and is based on IP including video conferencing and VoIP based on a session initiation protocol. Various uses for the application. Since the configuration of the IMS 100 is already disclosed in various forms, a detailed description thereof will be omitted.

IP-CAN network 210 is a portable Internet network including a mobile communication network supported by the terminal device 10, WCDMA Packet Switching (PS), Long Term Evolution (LTE), Wibro, CDMA EV-DO Etc. may be included. The IP-CAN network 210 supports WCDMA Packet Switching (LPS), Long Term Evolution (LTE), Wibro, and CDMA EV-DO by adopting a configuration such as an access network, a base station controller, an exchange, and an IP gateway. Could be. Since the IP-CAN network 210 is a name commonly used in the IMS service field, a detailed description thereof will be omitted.

P-CSCF (221, 222, 223 ...), the connection point that can be connected to the IMS (100) in the IP-CAN network 210, the packet routing and forwarding function, between the terminal device 10 and the IMS (100) It performs security functions and compression of IMS messages. In FIG. 1, the P-CSCFs 221, 222, 223... Are separated from the IMS 100, but the P-CSCFs 221, 222, 223... Are preferably included in the IMS 100.

Each of the P-CSCFs 221, 222, 223, etc., when a status confirmation message for status check is received from the DNS server 300, responds to the DNS server 300 with a response message to the status check message. At this time, each of the P-CSCFs (221, 222, 223 ...), if the status confirmation message due to its own failure situation or call congestion, or if the response message is not returned even if received, or even if the response message is returned The response message may not normally reach the DNS server 300 due to network overload. Of course, each of the P-CSCFs (221, 222, 223 ...), if there is no failure or call congestion itself and there is no normal network overload, the response message to the status confirmation message is returned by the DNS server (300) Will be reached.

When the terminal device 10 requests to open a call to the IP-CAN network 210 to use the IMS service, the IP-CAN network 210 requests the IMS 100 to allow the terminal device 10 to use the IMS service. In order to interwork with the network, a specialized call processing procedure of its own network (eg, WCDMA PS) is performed and an IP is assigned to the terminal device 10. At this time, the IP-CAN network 210 provides the terminal device 10 with address information that can be connected to the DNS server 300.

Accordingly, the terminal device 10 connects to the DNS server 300 based on the address information, and the domain address of the P-CSCF corresponding to the domain name (for example, pcscf.skt.com) previously held for the IMS service. Request information to DNS server 300.

The DNS server 300 stores domain name and domain address information corresponding to at least one P-CSCF (221, 222, 223 ...), and domain address information of the P-CSCF having a predetermined domain name from the terminal device 10. Is requested, the domain address information of the P-CSCF corresponding to the domain name is searched and serves to provide the searched domain address information to the terminal device 10. Here, in FIG. 1, the terminal device 10 and the DNS server 300 are directly connected, but this is for convenience of description, and the communication between the terminal device 10 and the DNS server 300 is also IP-CAN. It is made through the network (210).

Here, the DNS server 300 periodically provides a status confirmation message for status check to at least one P-CSCF (221, 222, 223 ...), and checks whether a response message to the status check message is returned. Information on whether to reply to the message is stored corresponding to each of the at least one P-CSCF (221, 222, 223 ...). A P-CSCF that normally responds to a response message may be a normal P-CSCF with no failure or call congestion and no network overload. As such, the DNS server 300 periodically grasps the state of each of the P-CSCFs 221, 222, and 223.

When the DNS server 300 requests domain address information of the P-CSCF having a predetermined domain name (for example, pcscf.skt.com) from the terminal device 10, the domain name (for example, pcscf.skt.com). The domain address information of the P-CSCF (for example, 222, 223) to which the response message is returned based on the corresponding reply status information among the searched domain address information of the P-CSCF corresponding to the P-CSCF. to provide.

Accordingly, since the P-CSCF (eg, 222, 223) corresponding to the domain address information provided from the DNS server 300 is confirmed to be in a normal state without a failure situation or congestion and no network overload, the terminal device 10 The P-CSCF immediately sets the P-CSCF without failure when attempting a call to the (2) P-CSCF 222 or (3) P-CSCF 223 based on the domain address information provided from the DNS server 300, The data packet service can be used through the IMS service by attempting an IMS message through the IP-CAN network 210 and the configured P-CSCF.

As described above, according to the P-CSCF setting system for the IMS service according to the present invention, the DNS server 300 continuously grasps the status of each of the P-CSCF (221, 222, 223 ...), the terminal device 10 P-CSCF domain access address information request from the terminal 10 by providing only the P-CSCF domain access address information in the normal state without problems in the call processing, the terminal device 10 immediately without P-CSCF It can be set and use IMS service.

On the other hand, when the DNS server 300 stores the response information of the response message for the status confirmation message corresponding to each of the at least one P-CSCF (221, 222, 223 ...), if there is a reply of the response message, It is preferable to store the reply time in response to the corresponding P-CSCF by measuring the reply time.

Accordingly, when the DNS server 300 requests domain address information of the P-CSCF having a predetermined domain name (eg pcscf.skt.com) from the terminal device 10, the domain name (eg pcscf.skt.com). Search for the domain address information of the P-CSCF corresponding to the P-CSCF and find the domain address information of the P-CSCF (for example, 222, 223) to which the response message is returned based on the corresponding reply information. Priority of the corresponding domain address information may be allocated to the terminal device in order of priority.

Accordingly, since the P-CSCF (for example, 222, 223) corresponding to the domain address information provided from the DNS server 300 is confirmed to be in a normal state and the priority is assigned in response to the quick order of call processing, the terminal apparatus 10 ) Attempts to call the corresponding P-CSCF (eg, (3) P-CSCF 223) based on the priority of the domain address information provided from the DNS server 300. It is possible to use the data packet service through the IMS service by attempting the IMS message through the IP-CAN network 210 and the configured P-CSCF as soon as possible without setting up the P-CSCF.

As described above, according to the P-CSCF setting system for the IMS service according to the present invention, the DNS server 300 continuously grasps the status of each of the P-CSCF (221, 222, 223 ...), the terminal device 10 When requesting P-CSCF domain access address information from P-CSCF domain access address information, only the P-CSCF domain access address information in a normal state has a fast reply time, that is, the priority is assigned in order of fast call processing. ), The terminal device 10 can use the IMS service by setting the P-CSCF as quickly as possible without failure.

Accordingly, according to the P-CSCF setting system for the IMS service according to the present invention, a conventional terminal device attempts to sequentially call the domain address information of the N P-CSCFs provided from the DNS server, the P-CS with a normal response By solving the problem of repeating the failure until the CSCF is found, the terminal device 10 can use the IMS service quickly and smoothly, and the user's satisfaction is improved. Improve call failure problems

Hereinafter, a detailed configuration of the aforementioned DNS server 300 will be described with reference to FIG. 2.

As shown in FIG. 2, the DNS server 300 of the present invention includes a DB for storing domain name and domain address information corresponding to at least one P-CSCF (221, 222, 223 ...) located in the IMS network 100. The management unit 310, the status confirmation message transmission unit 320 that periodically provides a status confirmation message for the status check to at least one P-CSCF (221, 222, 223 ...), and reply to the response message to the status confirmation message Whether the information is stored in the DB management unit 310 corresponding to each of the at least one P-CSCF (221, 222, 223 ...), the domain address information of the P-CSCF having a predetermined domain name from the external predetermined terminal device 10 When requested, the domain address of the P-CSCF is retrieved based on the DB management unit 310, and the domain address of the P-CSCF to which the response message is returned is based on the corresponding reply information among the searched domain address information. Obtaining information provided to the terminal device 10 The system manager 340 and a reply time measurer 330 are included.

The status confirmation message transmission unit 320 serves to periodically provide a status confirmation message for status confirmation to at least one P-CSCF (221, 222, 223 ...). Here, the status confirmation message is generally provided to at least one P-CSCF (221, 222, 223 ...) like a keep-alive message for determining the status between servers to receive a response message corresponding to the Ack. Any message that can be used is possible.

The reply time measuring unit 330 measures the reply time at which the reply message is returned by providing the status confirmation message to each of the at least one P-CSCFs 221, 222, 223 .... That is, the reply time measuring unit 330 starts time measurement when the status confirmation message is provided to each of the P-CSCFs 221, 222, 223 ..., and when the response message is returned from each of the P-CSCFs 221, 222, 223 ... In response to the corresponding P-CSCF returned, the response time corresponding to the elapsed time from the time measurement start until the response can be measured. Accordingly, the reply time measuring unit 330 stores the measured reply time in the DB manager 310 corresponding to the P-CSCF.

The DB management unit 310 is a storage unit for storing domain name and domain address information corresponding to at least one P-CSCF (221, 222, 223 ...), and the P-CSCF related information table of the form as shown in FIG. It is desirable to save 3).

Referring to the P-CSCF related information table 3, domain names corresponding to each of the P-CSCFs (221, 222, 223 ...), domain order information corresponding to each of the P-CSCFs (221, 222, 223 ...), and P-CSCF are described. (221, 222, 223 ...) may include reply information corresponding to each, and the reply time corresponding to each of the P-CSCF (221, 222, 223 ...).

The system management unit 340, as the status confirmation message transmission unit 320 provides a status confirmation message for the status check to at least one P-CSCF (221, 222, 223 ...), respectively, P-CSCF (221, 222, 223 ...) The response message returned from the server is monitored and the response message is stored in the DB management unit 310 corresponding to each of the at least one P-CSCF (221, 222, 223 ...). That is, the system manager 340 confirms whether or not the reply message is returned, and returns reply information (Y) to the reply status information field of the P-CSCF related information table 3 corresponding to the corresponding P-CSCF to which the reply message is returned. ) Is stored, and the reply status information (N) is stored in the reply status information field of the P-CSCF related information table 3 corresponding to the P-CSCF in which the response message is not returned after a predetermined elapsed time elapses. A P-CSCF that normally responds to a response message may be a normal P-CSCF with no failure or call congestion and no network overload. As such, the system manager 340 of the DNS server 300 periodically grasps the state of each of the P-CSCFs 221, 222, and 223.

At this time, when the response message is returned, the reply time measuring unit 330 responds to the corresponding P-CSCF by using the P-CSCF related information table 3 corresponding to the corresponding P-CSCF. In the reply time field.

If the system manager 340 requests domain address information of the P-CSCF having a predetermined domain name (for example, pcscf.skt.com) from the predetermined terminal device 10, the P-CSCF of the DB management unit 310 is requested. The domain address information of the P-CSCF corresponding to the domain name (eg pcscf.skt.com) is retrieved based on the related information table 3. And, the system manager 340, 111.111.111.111 corresponding to the retrieved domain address information ((1) P-CSCF 221, (2) 222.222.222.222, corresponding to P-CSCF 222, (3 ) 333.333.333.333 corresponding to P-CSCF (223), corresponding reply information ((1) N of P-CSCF (221), (2) Y of P-CSCF (222), (3) P-CSCF) Based on Y) of 223, the domain address information of the P-CSCF to which the response message is returned is found and obtained. Thereafter, the system manager 340 is configured to obtain domain address information (222.222.222.222 corresponding to (2) P-CSCF 222 and 333.333.333.333 corresponding to P-CSCF 223). Priority is assigned based on the reply time (2000 ms of (2) P-CSCF 222 and (10) 10 ms of P-CSCF 223). As shown in the P-CSCF related information table 3, since (3) 10 ms of the P-CSCF 223 corresponds to a reply time earlier than 2000 ms of the (2) P-CSCF 222, the system management unit 340 (3) assigns priority 1 to domain address information (333.333.333.333) corresponding to P-CSCF 223 and (2) to domain address information (222.222.222.222) corresponding to P-CSCF 222. Priority 2 is allocated to provide the terminal device 10 with domain address information of the P-CSCF (eg, 222, 223).

Accordingly, the P-CSCF (eg, 222, 223) corresponding to the domain address information (222.222.222.222, 333.333.333.333) provided from the DNS server 300 is confirmed to be in a normal state and has a priority in response to the fast call processing order. Since the terminal apparatus 10 has been assigned, the terminal apparatus 10 is based on the priority of the domain address information (333.333.333.333) according to the priority of the domain address information provided from the DNS server 300 (3) P-CSCF ( 223), by setting up the P-CSCF as soon as possible without attempting a call, and attempting an IMS message through the IP-CAN network 210 and the configured P-CSCF, the data packet service can be used through the IMS service. Of course, if it is determined that the call attempt to the preferred (3) P-CSCF 223 has failed, the terminal apparatus 10 (2) P- corresponds to the domain address information (222.222.222.222) of the next priority order 2. An IMS message may be attempted by attempting a call through the CSCF 222.

Here, the system manager 340 finds and obtains the domain address information of the P-CSCF to which the response message is returned, and then 222.222.222.222 corresponding to the obtained domain address information ((2) P-CSCF 222). , (3) 333.333.333.333 corresponding to P-CSCF (223), based on the corresponding reply time (2000 ms of (2) P-CSCF 222, (3) 10 ms of P-CSCF 223) It may be provided to the terminal device 10 in sequential order. That is, as shown in the P-CSCF related information table 3, the system manager 340 returns a reply time in which 10 ms of the (3) P-CSCF 223 is earlier than 2000 ms of the (2) P-CSCF 222. In this case, (3) domain address information (333.333.333.333) corresponding to the P-CSCF 223 is first provided to the terminal device 10, and (2) domain address information corresponding to the P-CSCF 222. (222.222.222.222) may be provided to the terminal device 10.

Accordingly, the terminal device 10 attempts to call the (3) P-CSCF 223 corresponding to the domain address information (333.333.333.333) provided from the DNS server 300 first, so that P-CSCF is the fastest without failure. By setting the IMS message through the IP-CAN network 210 and the set P-CSCF, the data packet service can be used through the IMS service. Of course, if it is determined that (3) the call attempt to the P-CSCF 223 is unsuccessful, the terminal apparatus 10 then (2) P-CSCF 222 corresponding to the next provided domain address information (222.222.222.222). You can also try IMS messages by attempting to call through.

As described above, according to the DNS server according to the present invention, the status of each of the P-CSCF (221, 222, 223 ...) is continuously grasped, and the call processing when the P-CSCF domain access address information request from the terminal device (10) Only the P-CSCF domain access address information in a normal state having no problem is provided with a quick reply time, that is, the priority is assigned to the terminal device 10 in order of priority, and the call response is fast. By sequentially providing the terminal apparatuses 10 in the fast order, the terminal apparatus 10 can use the IMS service by setting the P-CSCF as quickly as possible without fail.

Accordingly, according to the P-CSCF setting system for the IMS service to which the DNS server according to the present invention is applied, a conventional terminal device attempts to sequentially call domain address information of N P-CSCFs provided from a DNS server, thereby providing normal service. By solving the problem of repeating the failure until a P-CSCF with a response is found, the IMS service can be used quickly and smoothly for the terminal device 10, thereby improving user satisfaction and minimizing unnecessary call processing for the network. This can improve the load and cascade call problems.

Hereinafter, a control flow of a P-CSCF setting method for an IMS service according to a preferred embodiment of the present invention will be described.

In the P-CSCF setting method for the IMS service according to the present invention, the DNS server 300 that stores domain name and domain address information corresponding to at least one P-CSCF (221, 222, 223 ...) is at least one P-CSCF. (221, 222, 223 ...) periodically providing a status check message for the status check, and whether or not the reply information of the response message to the status check message to the DNS server 300 at least one P-CSCF (221, 222, 223 ... .) Storing corresponding to each, and predetermined domain name to the DNS server 300 corresponding to the provided address information as the predetermined terminal device 10 requests to open a call to the IP-CAN network 210. Requesting domain address information of a P-CSCF having a request; and requesting domain address information of a P-CSCF having a predetermined domain name from the terminal device 10, the DNS server 300 corresponds to a domain name of the P-CSCF. Retrieving domain address information of the DNS server 300; And providing the terminal apparatus 10 with the domain address information of the P-CSCF to which the response message is returned based on the corresponding reply information among the domain address information.

Referring to FIG. 4, the control flow of the P-CSCF setting method for the IMS service according to the first embodiment of the present invention will be described in detail, and the configuration shown in FIGS. 1 to 3 described above for convenience of description. Will be described with reference to the reference number.

First, the DNS server 300 periodically provides a status confirmation message for the status check to each of the at least one P-CSCF (221, 222, 223 ...) (S10, S11, S12). Here, the overall control flow of FIG. 4 will be described on the assumption that the DNS server 300 is a flow within one period of providing a status confirmation message to each of the P-CSCFs 221, 222, 223. Status check messages are generally provided to at least one P-CSCF (221, 222, 223 ...), such as keep-alive messages for determining the status between servers, and can receive a response message corresponding to Ack. Any message of the form is possible.

Accordingly, each of the P-CSCFs 221, 222, 223 ... returns a response message to the DNS server 300 for the status confirmation message received from the DNS server 300. In this case, each of the P-CSCFs (221, 222, 223 ...) does not normally receive or reply to the response message even if the status confirmation message is received due to its own failure situation or congestion. The response message may not normally reach the DNS server 300 due to network overload. Therefore, in FIG. 4, it is assumed that (2) P-CSCF 222 and (2) P-CSCF 223 are normal states without their own failure situation or congestion, and network overload does not occur. The response message is normally returned to the DNS server 300 (S20, S21).

Accordingly, the DNS server 300 monitors the response messages returned from each of the P-CSCFs 221, 222, 223 ... as providing a status confirmation message, thereby checking whether the response messages are returned or not. ) And store corresponding to each (S30).

Here, the DNS server 300 starts the time measurement when the status check message is provided to each of the P-CSCFs (221, 222, 223 ...), and when the response message is returned from each of the P-CSCFs (221, 222, 223 ...), the corresponding reply is returned. In response to the P-CSCF, the response time corresponding to the elapsed time from the time measurement start to the response is measured, and the measured response time is stored in correspondence with the corresponding P-CSCF (S40).

Accordingly, the DNS server 300 is a domain name corresponding to each of the P-CSCF (221, 222, 223 ...), domain order information corresponding to each of the P-CSCF (221, 222, 223 ...), and P, as shown in FIG. -Store and manage the P-CSCF related information table 3 including reply status information corresponding to each of the CSCFs 221, 222, 223 ... and reply times corresponding to the P-CSCFs 221, 222, 223 ..., respectively.

On the other hand, as a request to open a call to the IP-CAN network 210 to use the IMS service, the terminal device 10 provided with the address information of the DNS server 300, based on the address information DNS server 300 Request the domain address information of the P-CSCF having a predetermined domain name (for example, pcscf.skt.com) (S60).

The DNS server 300 continuously determines whether domain address information of the P-CSCF having a predetermined domain name is requested from an external terminal device (S70), and receives a domain name (eg, pcscf. When the domain address information of the P-CSCF having skt.com) is requested, the domain address information of the P-CSCF corresponding to the domain name (for example, pcscf.skt.com) based on the P-CSCF related information table 3 is requested. Search for (S80). And, the DNS server 300, the retrieved domain address information (111.111.111.111 corresponding to (1) P-CSCF 221, (2) 222.222.222.222, (3) corresponding to P-CSCF 222) 333.333.333.333 corresponding to the P-CSCF 223, corresponding reply information ((1) N of P-CSCF 221, (2) Y of P-CSCF 222, (3) P-CSCF ( On the basis of Y) in step 223, the domain address information of the P-CSCF to which the response message is returned is retrieved and obtained (S90). Thereafter, the DNS server 300 is one of the obtained domain address information (222.222.222.222 corresponding to (2) P-CSCF 222, and 333.333.333.333 corresponding to (3) P-CSCF 223). Priority is assigned based on the corresponding reply time (2000 ms of (2) P-CSCF 222 and (10) 10 ms of P-CSCF 223) in order of return time (S100). As shown in the P-CSCF related information table (3), (3) 10 ms of the P-CSCF 223 corresponds to a reply time earlier than 2000 ms of the (2) P-CSCF 222, so that the DNS server 300 (3) assigns priority 1 to domain address information (333.333.333.333) corresponding to P-CSCF 223 and (2) to domain address information (222.222.222.222) corresponding to P-CSCF 222. Assign priority 2.

The DNS server 300 provides the terminal device 10 with domain address information (222.222.222.222, 333.333.333.333) of the P-CSCF (for example, 222,223) to which the priority is assigned (S110).

Accordingly, the terminal device 10 confirms that the P-CSCF (eg, 222, 223) corresponding to the domain address information (222.222.222.222, 333.333.333.333) provided from the DNS server 300 is in a normal state and the call processing is quick. Since the priority is assigned to the terminal apparatus 10, the terminal apparatus 10 is based on the domain address information (333.333.333.333) that is most preferred according to the priority of the domain address information provided from the DNS server 300 ( 3) Data packet service is established through IMS service by attempting to call P-CSCF 223, and setting up P-CSCF as soon as possible without fail, and attempting IMS message through IP-CAN network 210 and configured P-CSCF. It is available.

On the other hand, if the domain address information of the P-CSCF having a predetermined domain name is not requested from the terminal device in step S70, the DNS server 300, after a predetermined period of time has elapsed, each of the P-CSCF (221, 222, 223 ...) By entering the S10, S11, S12 that provides a status check message for the status check, the status check message is provided periodically.

As described above, according to the P-CSCF setting method for the IMS service according to the present invention, the DNS server 300 continuously grasps the state of each of the P-CSCF (221, 222, 223 ...), the terminal device 10 When requesting P-CSCF domain access address information from P-CSCF domain access address information, only the P-CSCF domain access address information in a normal state has a fast reply time, that is, the priority is assigned in order of fast call processing. ), The terminal device 10 can use the IMS service by setting the P-CSCF as quickly as possible without failure.

5, a control flow of a P-CSCF setting method for an IMS service according to a second preferred embodiment of the present invention will be described. Prior to the description, the same steps as in the first embodiment of FIG. 4 have the same reference numerals, and detailed descriptions thereof will be omitted.

First, the DNS server 300 periodically provides a status confirmation message for the status check to each of the at least one P-CSCF (221, 222, 223 ...) (S10, S11, S12).

Accordingly, each of the P-CSCFs 221, 222, 223 ... returns a response message to the DNS server 300 for the status confirmation message received from the DNS server 300. At this time, it is assumed that (2) P-CSCF 222 and (2) P-CSCF 223 are normal states without their own failure situation or congestion, and network overload does not occur. It is assumed that the DNS server 300 normally returns (S20, S21). Accordingly, the DNS server 300 monitors the response messages returned from each of the P-CSCFs 221, 222, 223 ... as providing a status confirmation message, thereby checking whether or not the response messages are returned at least one P-CSCF (221, 222, 223 ...). ) And store corresponding to each (S30).

Here, the DNS server 300 measures the reply time at which the response message is returned from each of the P-CSCFs 221, 222, 223, ..., and stores the measured reply time corresponding to the corresponding P-CSCF (S40).

On the other hand, as a request to open a call to the IP-CAN network 210 to use the IMS service, the terminal device 10 received the address information of the DNS server 300, based on the address information DNS server ( Request the domain address information of the P-CSCF having a predetermined domain name (for example, pcscf.skt.com) to 300 (S60). The DNS server 300 continuously determines whether domain address information of the P-CSCF having a predetermined domain name is requested from an external terminal device (S70), and receives a domain name (eg, pcscf. When the domain address information of the P-CSCF having skt.com) is requested, the domain address information of the P-CSCF corresponding to the domain name (for example, pcscf.skt.com) based on the P-CSCF related information table 3 is requested. Search for (S80). And, the DNS server 300, the retrieved domain address information (111.111.111.111 corresponding to (1) P-CSCF 221, (2) 222.222.222.222, (3) corresponding to P-CSCF 222) 333.333.333.333 corresponding to the P-CSCF 223, corresponding reply information ((1) N of P-CSCF 221, (2) Y of P-CSCF 222, (3) P-CSCF ( On the basis of Y) in step 223, the domain address information of the P-CSCF to which the response message is returned is retrieved and obtained (S90). Thereafter, the DNS server 300 is one of the obtained domain address information (222.222.222.222 corresponding to (2) P-CSCF 222, and 333.333.333.333 corresponding to (3) P-CSCF 223). Based on the corresponding reply time (2000 ms of (2) P-CSCF 222 and (10) 10 ms of P-CSCF 223), the reply time is sequentially provided to the terminal device 10 in the order of rapid response (S120). ). That is, as shown in the P-CSCF related information table 3, (3) since 10 ms of the P-CSCF 223 corresponds to a reply time earlier than 2000 ms of the (2) P-CSCF 222, the DNS server ( 300, (3) domain address information (333.333.333.333) corresponding to the P-CSCF (223) is first provided to the terminal device (10) and (2) domain address information corresponding to the P-CSCF (222). (222.222.222.222) is provided to the terminal device 10.

Accordingly, the terminal device 10 attempts to call the (3) P-CSCF 223 corresponding to the domain address information (333.333.333.333) provided from the DNS server 300 first, so that P-CSCF is the fastest without failure. By setting the IMS message through the IP-CAN network 210 and the set P-CSCF, the data packet service can be used through the IMS service.

As described above, according to the P-CSCF setting method for the IMS service according to the present invention, the DNS server 300 continuously grasps the state of each of the P-CSCF (221, 222, 223 ...), the terminal device 10 When requesting P-CSCF domain access address information from P-CSCF domain access address information, only the P-CSCF domain access address information in a normal state has a fast reply time, that is, the priority is assigned in order of fast call processing. Or by providing the terminal device 10 in the order of fast response time, that is, the call processing is fast, the terminal device 10 can use the IMS service by setting the P-CSCF as soon as possible without failure. have.

Accordingly, according to the P-CSCF setting method for the IMS service according to the present invention, the conventional terminal equipment attempts to sequentially call the domain address information of the N P-CSCFs provided from the DNS server, P- with a normal response By solving the problem of repeating the failure until the CSCF is found, the terminal device 10 can use the IMS service quickly and smoothly, and the user's satisfaction is improved. Improve call failure problems

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the technology to which the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

DNS server keeps track of each state of P-CSCF, and when requesting P-CSCF domain access address information from terminal equipment, only the normal P-CSCF domain access address information without any problem in call processing is fast. In this regard, the P-CSCF setting system and the IMS service for the IMS service, which can use the IMS service by setting the P-CSCF as soon as possible without fail, can be provided to the terminal device considering the quick order of call processing. In case of applying P-CSCF setting method, it is possible to make great progress in terms of IMS service usage speed and network call management efficiency and user satisfaction. It is an invention that is industrially applicable because it is practically evident.

1 is a control block diagram of a P-CSCF setting system for an IMS service according to a preferred embodiment of the present invention.

2 is a control block diagram of a DNS server according to a preferred embodiment of the present invention.

3 is an exemplary diagram of a P-CSCF related information table stored in a DNS server according to a preferred embodiment of the present invention.

4 is a control flowchart of a P-CSCF setting method for an IMS service according to a first embodiment of the present invention.

5 is a control flowchart of a P-CSCF setting method for an IMS service according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: terminal device 100: IMS

210: IP-CAN network 221,222,223: P-CSCF

300 DNS server

Claims (13)

At least one proxy-call session control function (P-CSCF); Requests to open a call to an IP-CAN network and a domain name of a P-CSCF having a predetermined domain name as a DNS (Domain Name System) server corresponding to address information provided from the IP-CAN network. A terminal device for requesting information; And Returning a response message to the status confirmation message by storing domain name and domain address information corresponding to the at least one P-CSCF, and periodically providing a status confirmation message for status confirmation to the at least one P-CSCF. Storing status information corresponding to each of the at least one P-CSCF, and when domain address information of the P-CSCF having the predetermined domain name is requested from the terminal device, domain address information of the P-CSCF corresponding to the domain name. And a DNS server for providing the terminal device with domain address information of the P-CSCF with the reply of the response message based on the corresponding reply information among the searched domain address information. P-CSCF setting system. The method of claim 1, The DNS server, When storing the response information of the response message for the status confirmation message corresponding to each of the at least one P-CSCF, if there is a reply of the response message, the response time of the response message is measured to correspond to the corresponding P-CSCF. Storing the reply time, and assigning a priority to the domain address information of the P-CSCF to which the reply message is retrieved according to the request of the P-CSCF domain address information from the terminal device in order of increasing the reply time. P-CSCF setting system for the IMS service, characterized in that provided to the terminal device. The method of claim 2, The terminal device, According to the priority of domain address information provided from the DNS server, an IMS message is attempted through a predetermined P-CSCF, and if it is determined that the attempt to the P-CSCF is unsuccessful, it corresponds to domain address information of the next priority order. P-CSCF setting system for an IMS service, characterized in that for attempting IMS messages through the P-CSCF. In the DNS server, DB management unit for storing domain name and domain address information corresponding to at least one Proxy-Call Session Control Function (P-CSCF) located in the IMS network; A status confirmation message transmission unit periodically providing a status confirmation message for status confirmation to the at least one P-CSCF; Response information of the response message to the status confirmation message is stored in the DB management unit corresponding to each of the at least one P-CSCF, and domain address information of the P-CSCF having a predetermined domain name from an external predetermined terminal device is stored. If requested, retrieves the domain address information of the P-CSCF corresponding to the domain name based on the DB management unit, and the domain address of the P-CSCF to which the response message is returned based on the corresponding reply information among the searched domain address information. DNS server, characterized in that it comprises a system management unit for obtaining the information to the terminal device. The method of claim 4, wherein The status acknowledgment message transmission unit provides the status acknowledgment message to each of the at least one P-CSCF to measure a reply time to which the response message is returned, and stores the measured reply time in correspondence with the corresponding P-CSCF to the DB manager. DNS server, characterized in that it further comprises a reply time measuring unit. The method of claim 5, The system management unit, As the domain address information of the P-CSCF having the domain name is requested from the terminal device, the domain address information of the P-CSCF with the reply of the response message among the domain address information of the P-CSCF retrieved based on the DB management unit. Acquiring and assigning priority to the obtained domain address information in the order of the quickest reply time and providing the same to the terminal device. The method of claim 5, The system management unit, As the domain address information of the P-CSCF having the domain name is requested from the terminal device, the domain address information of the P-CSCF with the reply of the response message among the domain address information of the P-CSCF retrieved based on the DB management unit. Acquiring the domain address information of the P-CSCF and sequentially providing the obtained P-CSCF to the terminal device in order of quick response time. 8. The method according to claim 6 or 7, The DB management unit, And a P-CSCF related information table including a domain name, domain address information, reply status information, and reply time corresponding to each of the at least one P-CSCF. Periodically providing, by a DNS server storing domain name and domain address information corresponding to at least one P-CSCF, a status confirmation message for status checking to the at least one P-CSCF; Storing, by the DNS server, corresponding to each of the at least one P-CSCF, reply information of a response message to the status confirmation message; Requesting domain address information of a P-CSCF having a predetermined domain name to the DNS server corresponding to the address information provided as a predetermined terminal device requests to open a call to an IP-CAN network; If domain address information of the P-CSCF having the predetermined domain name is requested from the terminal device, retrieving domain address information of the P-CSCF corresponding to the domain name by the DNS server; And And providing, by the DNS server, the terminal apparatus with the domain address information of the P-CSCF to which the response message is returned based on the corresponding reply information among the searched domain address information. How to set up P-CSCF. In the P-CSCF domain address information providing method of the DNS server, Storing domain name and domain address information corresponding to at least one proxy-call session control function (P-CSCF) located in an IMS network; Periodically providing a status message for status checking with at least one P-CSCF located in an IMS network; Storing reply status information of a response message to the status confirmation message corresponding to each of the at least one P-CSCF; If domain address information of the P-CSCF having a predetermined domain name is requested from an external predetermined terminal device, retrieving domain address information of the P-CSCF corresponding to the domain name; And P-CSCF domain address of the DNS server, characterized in that it provides the terminal device with the domain address information of the P-CSCF with the reply of the response message on the basis of the reply information of the retrieved domain address information; How to Provide Information. 11. The method of claim 10, And providing the status acknowledgment message to each of the at least one P-CSCF to measure a reply time to which the response message is returned, and storing the measured reply time corresponding to the corresponding P-CSCF. P-CSCF domain address information providing method of the DNS server. The method of claim 11, Providing the domain address information to the terminal device, And assigning a priority to the domain address information of the P-CSCF to which the response message is returned in order of the quickest reply time, and providing the terminal device with the P-CSCF domain address information of the DNS server. 13. The method of claim 12, Providing the domain address information to the terminal device, And providing the domain address information of the P-CSCF having the reply of the response message to the terminal device sequentially in the order of the quick reply time.
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