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 PDFInfo
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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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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
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-
Here, the
The
IP-
P-CSCF (221, 222, 223 ...), the connection point that can be connected to the IMS (100) in the IP-
Each of the P-
When the
Accordingly, the
The
Here, the
When the
Accordingly, since the P-CSCF (eg, 222, 223) corresponding to the domain address information provided from the
As described above, according to the P-CSCF setting system for the IMS service according to the present invention, the
On the other hand, when the
Accordingly, when the
Accordingly, since the P-CSCF (for example, 222, 223) corresponding to the domain address information provided from the
As described above, according to the P-CSCF setting system for the IMS service according to the present invention, the
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
Hereinafter, a detailed configuration of the
As shown in FIG. 2, the
The status confirmation
The reply
The
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
At this time, when the response message is returned, the reply
If the
Accordingly, the P-CSCF (eg, 222, 223) corresponding to the domain address information (222.222.222.222, 333.333.333.333) provided from the
Here, the
Accordingly, the
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
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
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
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
Accordingly, each of the P-
Accordingly, the
Here, the
Accordingly, the
On the other hand, as a request to open a call to the IP-
The
The
Accordingly, the
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
As described above, according to the P-CSCF setting method for the IMS service according to the present invention, the
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
Accordingly, each of the P-
Here, the
On the other hand, as a request to open a call to the IP-
Accordingly, the
As described above, according to the P-CSCF setting method for the IMS service according to the present invention, the
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
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
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KR20070045488A (en) * | 2005-10-27 | 2007-05-02 | 엘지전자 주식회사 | System and method for management of packet service using dns server in mobile terminal |
KR20070079144A (en) * | 2006-02-01 | 2007-08-06 | 에스케이 텔레콤주식회사 | Method for establishing a dns for a wireless internet service |
KR20070087096A (en) * | 2004-12-14 | 2007-08-27 | 아스트라제네카 아베 | Oxadiazole derivatives as dgat inhibitors |
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KR20070087096A (en) * | 2004-12-14 | 2007-08-27 | 아스트라제네카 아베 | Oxadiazole derivatives as dgat inhibitors |
KR20070045488A (en) * | 2005-10-27 | 2007-05-02 | 엘지전자 주식회사 | System and method for management of packet service using dns server in mobile terminal |
KR20070079144A (en) * | 2006-02-01 | 2007-08-06 | 에스케이 텔레콤주식회사 | Method for establishing a dns for a wireless internet service |
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