KR101523935B1 - Method and apparatus for providing call process in service providing system based on internet protocol, home subscribe server for call process - Google Patents

Abstract

The existing Internet protocol based call processing service has a limitation in that it is difficult to actively cope with the state of each S-CSCF (Serving-Call Session Control Function). For example, when the S-CSCF to which the HSS (Home Subscribe Server) responds or the S-CSCF managed by the I-CSCF (Interrogate-Call Session Control Function) itself can not normally answer, The mobile subscriber can not be provided with normal call processing service if a failure occurs in the specific S-CSCF or if the mobile subscriber is overloaded. Accordingly, the present invention excludes the registration of a corresponding S-CSCF when a specific S-CSCF is in a failure state or an overload state in an Internet protocol-based call processing environment in which a plurality of S-CSCFs exist, Or an S-CSCF having a small number of registered subscribers, to provide an efficient call processing environment, and to provide a call processing method in an Internet protocol based service providing system.

Internet Protocol, CSCF, HSS

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for processing a call in an Internet protocol-based service providing system, and a home subscriber server for processing a call. BACKGROUND OF THE INVENTION 1. Field of the Invention [

The present invention relates to an Internet Protocol (IP) -based service, and more particularly, to a method and apparatus for processing a call in an Internet protocol-based service providing system suitable for providing an efficient call process service through subscriber distribution processing, To a home subscriber server.

Currently, the 3GPP (3 ^rd Generation Partnership Project) is being proposed as a new standard for the production, transmission and playback of multimedia through high-speed wireless networks. The Internet Protocol Multimedia Subsystem (hereinafter referred to as IMS) proposed in the 3GPP standard is a system for providing a next generation IP-based multimedia service.

The IMS service refers to providing various types of packet services based on a lower IP transmission protocol to a mobile subscriber (mobile communication terminal) at the same time. The IMS service can simultaneously provide various types of packet based services based on an IP transmission protocol to a mobile subscriber. The IMS service can be used for a mobile subscriber as well as real time services such as voice, video, , Short messages or other non-real-time services, or to use new services using these services.

In order for the mobile subscriber to receive the IMS service, a registration process is performed. In this registration process, a call control function must be assigned to control the call and the service of the mobile communication terminal of the mobile subscriber.

In order to provide such IMS service, an important function element of the subsystem in the core network of IMS is a call session control function (CSCF) and a home subscriber server (HSS).

The HSS serves as a master database of a mobile subscriber, and is a kind of database that integrates functions of a home location register (Home Location Register) and functions for mobility management and authentication of an IP multimedia subscriber.

The CSCF is a device for performing registration and multimedia call processing functions using SIP (Session Initiation Protocol), and includes a Proxy-Call Session Control Function (P-CSCF), a Query / An Interrogate-Call Session Control Function (hereinafter referred to as I-CSCF), and a Serving-Call Session Control Function (hereinafter referred to as S-CSCF).

The P-CSCF is the point at which the mobile subscriber initially connects to the network. The P-CSCF relays the SIP registration request message of the mobile subscriber to the I-CSCF with reference to the home domain of the subscriber, and maintains the security relationship with the mobile subscriber.

The I-CSCF obtains the address of the S-CSCF performing the SIP registration of the mobile subscriber from the HSS and allocates the S-CSCF responsible for the actual registration of the mobile subscriber.

The S-CSCF downloads the subscription information of the mobile subscriber from the HSS, stores it, and provides the corresponding service to the mobile subscriber.

For IMS call processing, it must register with the S-CSCF using the IP and ID of the mobile subscriber, e.g., a telephone number, a login ID, and the like. At this time, the I-CSCF queries the HSS to determine which S-CSCF should be registered. The overall call process including this process will be briefly described below.

First, when the P-CSCF receiving the mobile subscriber's request makes a registration request to the I-CSCF, the I-CSCF makes an S-CSCF search request to the HSS to find the S-CSCF to register.

The HSS determines whether an existing S-CSCF is registered. If there is an S-CSCF registered in the past (in the case of re-registration), the HSS responds the corresponding S-CSCF information with the I-CSCF, The I-CSCF will inform you to make your own judgment.

When the HSS informs the S-CSCF information, the I-CSCF sends a registration request message to the corresponding S-CSCF, and upon receiving the registration request message, the S-CSCF notifies the mobile subscriber of a status message To the HSS.

On the other hand, if the HSS transmits a registration status response message to the corresponding S-CSCF, it is possible to control the IMS call processing service for the corresponding S-CSCF.

However, existing Internet protocol-based call processing services have a limit in that it is difficult to actively cope with the state of each S-CSCF.

For example, in a typical Internet protocol-based call processing environment, there may be a case where the S-CSCF to which the HSS responds or the S-CSCF managed by the I-CSCF itself can not normally answer. In case the S-CSCF fails or is overloaded, the mobile subscriber will not be able to receive the service due to the failure to register properly.

The present invention provides an efficient call processing environment by excluding registration of a corresponding S-CSCF when a specific S-CSCF is in a failure state or an overload state in an Internet protocol based call processing environment in which a plurality of S-CSCFs exist And to provide a call processing method in an Internet protocol based service providing system.

Further, in the Internet protocol-based call processing environment, the S-CSCF having a fast response time and / or a small number of registered subscribers is registered, thereby maximizing the subscriber dispersion effect and increasing the service satisfaction We propose a call processing method in Internet Protocol based service providing system.

According to an aspect of the present invention, there is provided a method for providing a periodic status check result for a group of serving call control function units of the Internet Protocol based wireless network, The method comprising the steps of: setting an arbitrary serving call control function unit as a registration target serving call control function unit in accordance with a service type of the serving call control function unit and performing a service control between the set serving call control function unit and the terminal; A call processing method of the present invention.

According to another aspect of the present invention, there is provided a method for transmitting a response message from a serving call control function unit to a check message transmitted to an arbitrary serving call control function unit of a group of a serving call control function unit of an Internet Protocol- The method comprising the steps of: checking a reception time, checking a subscriber registration number of each serving call control function unit of the group of the serving call control function groups; The method comprising the steps of: assigning a registration target priority of a call control function to a call control function unit; and, if there is a registration request of the terminal through the Internet protocol based wireless network, Providing internet protocol based service including transmission to wireless network And provides a call processing method in the system.

According to another aspect of the present invention, there is provided a mobile communication system including: a relay call control function unit for relaying a registration request message transmitted from a terminal connected to an Internet Protocol-based wireless network; And transmitting the response message to the relay call control function unit. The control unit periodically checks and checks the status information of the group of the serving call control function units, And a home subscriber server that responds to the registration request message query based on the status information of the group of the serving call control function units when there is a registration request message query from the home server A call processing apparatus is provided.

According to another aspect of the present invention, there is provided a mobile communication system including a query receiver for receiving a registration target serving call control function query message corresponding to a registration request message from a terminal connected to an Internet Protocol based wireless network, A subscriber distribution management unit that periodically checks the status of the group of the serving call control function units of the base station based on the serving call control function query message and distributes the serving calls to the subscriber distribution control unit, And a response sending unit for sending a response message to the registration target serving call control function query message based on the status information of the control function subgroup, to the home subscriber server for call processing in the Internet protocol based service providing system .

According to the present invention, when a specific S-CSCF is in a failure state or an overload state in the Internet protocol-based call processing environment in which a plurality of S-CSCFs exist, the registration of the corresponding S-CSCF is excluded, Or the S-CSCF having a small number of registered subscribers, it is possible to provide an efficient call processing environment capable of maximizing the distribution effect of subscribers and enhancing service satisfaction.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a call processing apparatus in an Internet Protocol (IP) based service providing system according to an aspect of the present invention. The terminal includes a terminal 100, a wireless network 102, A P-CSCF 104, a Proxy-Call Session Control Function (hereinafter referred to as P-CSCF) 104, an Interrogate-Call Session Control Function (Hereinafter referred to as HSS) 108, and a Serving-Call Session Control Function (hereinafter referred to as S-CSCF) group 110.

1, a terminal 100 is a mobile communication terminal such as a cellular phone, a DMB phone, and a videophone phone. The terminal 100 interfaces with a wireless network 102, which will be described later, Provide communication service.

Such a terminal 100 is not limited to a second generation that supports a CDMA (Code Division Multiple Access) system, but also a wireless environment supporting a third generation or more mobile communication technology of W-CDMA (Wideband Code Division Multiple Access) In particular, the terminal according to the present embodiment may be used for a next generation mobile communication service based on an integrated IP (All-IP) network, that is, a voice call and a packet service, as well as a wireless environment May be included. Although FIG. 1 illustrates one terminal, it is to be understood that the present invention is not limited thereto. It is to be understood that there are several terminals connected to the wireless network 102, It would be easy to know if you have someone.

The wireless network 102 is responsible for the call setup, the packet service, the IP multimedia service, and the resource allocation of the terminal 100. The wireless network 102 assures the mobility of the terminal 100 and handles handover and radio resource management functions. do.

The wireless network 102 includes a base station and a base station controller, and supports both synchronous and asynchronous services. In case of the synchronous type, the base station will be a base transceiver station (BTS) and the base station controller will be a base station controller (BSC). In case of asynchronous type, the base station will be a Node B, . Of course, the wireless network 102 is not limited to the CDMA network, but may include a GSM network and an access network of all mobile communication systems to be implemented in the future.

For example, the wireless network for providing the IP-based service of the present embodiment includes a Serving GPRS Supporting Node (SGSN), a Gateway Supporting Node (GGSN), a Terminal (Media Resource Function) for allocating / releasing resources of the MGW, MGCF (Media Gateway Control) for controlling the MGW, and the like, Function, an MGCF, and a Signaling Gateway (SGW) connected to a public network and converting mutual signals.

The P-CSCF 104 sends a registration request message sent from the terminal 100 to the I-CSCF 106 or any S-CSCF in the S-CSCF group 110, e.g., S- CSCF1 (110/1).

The I-CSCF 106 obtains the address of the S-CSCF performing the SIP registration of the terminal 100 from the HSS 108 and allocates the S-CSCF responsible for the actual registration of the terminal 100.

Specifically, the I-CSCF 106 sends a registration request message, which is transmitted from the P-CSCF 104, to the HSS 108 to query the S-CSCF to register and sends a response of the HSS 108, CSCF1 110/1 according to a response message of the HSS 108 for the CSCF inquiry to the corresponding S-CSCF, for example, the S-CSCF1 110/1. CSCF1 (100/1) is selected in the S-CSCF group 110 and the selected S-CSCF1 (100/1) and the terminal (100/1) are selected by the P- 100 is performed.

The HSS 108 includes a third generation HLR (Home Location Register) function for data management of voice and packet service subscribers. In addition, for data storage and management for IP multimedia service subscribers, an IP multimedia control protocol function, Verification function, and address translation function.

In particular, the HSS 108 periodically checks and grasps the status information of the S-CSCF group 110 according to the present embodiment and notifies the I-CSCF 106 of the status of the S- CSCF 106 in response to a query request, based on the status information of the identified S-CSCF group 110. At this time, the status information check of the HSS 108 with respect to the S-CSCF group 110 can be implemented with reference to the response wait time and subscriber registration number of each S-CSCF, ) Will be described in detail.

The S-CSCF group 110 includes a plurality of S-CSCFs 100/1 to 100 / n. Each S-CSCF, for example, the S-CSCF1 100/1, And downloads and registers the subscription information of the terminal 100 from the HSS 108 and provides the corresponding service to the terminal 100.

Fig. 2 shows the HSS 108 in more detail in the call processing device in the IP-based service providing system of Fig. 1 described above.

2, the HSS 108 includes a query reception unit 10, a subscriber distribution management unit 12, a message transmission / reception unit 14, a response wait time table 16, a subscriber registration number table 18, And a transmitter 20.

First, the inquiry receiving unit 10 receives a registration request message from the I-CSCF 106, that is, a query request message for the S-CSCF to be registered, and transmits the message to the subscriber distribution managing unit 12.

The subscriber distribution management unit 12 periodically checks the status of the S-CSCF group 110 and transmits the good or optimal S-CSCF information according to the check result to the I-CSCF 106. [

In the present embodiment, the status check and management of the S-CSCF group 110 of the subscriber distribution management unit 12 is performed by 1) status check and management by the response wait time, 2) status check by the subscriber registration number, Management, can be roughly divided into two.

1) Check status by response waiting time

CSCF group 110 via the message transmission / reception unit 14 and receives a response message from the S-CSCF group 110 via the message transmission / reception unit 14 and transmits the response message to the S-CSCF group 110 110), and manages the S-CSCF to be registered. For example, it periodically checks the wait time (response speed) of the response message, and if the response message is not received within a predetermined time (when the response wait time exceeds the preset time), the S- Fault " state, i.e. excluded from the registration target S-CSCF. Also, when a response message is received within a predetermined time, the S-CSCF is judged and managed as a " good " state, that is, managed by the registration target S-CSCF. At this time, the registration target S-CSCFs are given a registration target priority according to the response waiting time. For example, among the S-CSCFs determined to be in the " good " state, the S-CSCF with the minimum response waiting time may be judged and managed as an " optimal "

The response wait time required for such judgment and management can be stored in the response wait time table 16, which can be illustrated as the following [Table 1].

S-CSCF condition Response time 111.111.111.111 Good 10ms 111.111.111.222 Good 20ms 111.111.111.333 obstacle N / A

The S-CSCF with the S-CSCF information of "011, 111, 111, 333" in Table 1 is judged as having failed to receive the response message within the predetermined time, It is determined that a response message has been received within a predetermined time, for example, 20 ms, and it is recognized that the response message is managed by the S-CSCF to be registered.

2) Status check by subscriber registration number

The subscriber distribution management unit 12 checks the registration number of the actual subscriber and manages the S-CSCF to be registered. For example, the subscriber distribution management unit 12 periodically checks the subscriber registration number. If the S-CSCF exceeds the preset number of registrations, the S-CSCF is judged and managed as a "failure" state, . In addition, when the S-CSCF is included in the preset registration number, the S-CSCF is judged and managed as a "good" state, that is, managed by the registration target S-CSCF. At this time, the registration target S-CSCFs are given a registration target priority according to the number of subscriber registrations. For example, the S-CSCF having the minimum number of subscriber enrollments among S-CSCFs determined to be in the " good " state may be judged and managed as an " optimal "

The subscriber registration number required for such judgment and management can be stored in the subscriber registration number table 18, which can be illustrated as the following [Table 2].

S-CSCF condition Subscriber registration number 111.111.111.111 Good 123,000 111.111.111.222 Good 200,033 111.111.111.333 obstacle N / A

The S-CSCF with S-CSCF information of "11, 111, 111, 333" in Table 2 is judged as exceeding the preset number of registered subscribers, It is judged to be included in the set number of registered subscribers, for example, 200,000, and it is recognized that it is managed by the S-CSCF to be registered.

On the other hand, when the registration request message is received through the above-described question receiving unit 10, the subscriber distribution management unit 12 determines whether or not the S-CSCF 110 is in the best S-CSCF based on the status information of the S- (S-CSCF) having the minimum response waiting time, for example, the S-CSCF and / or the S-CSCF with the minimum number of subscriber enrollments, and sends a response message to the S- 20). At this time, the response transmission unit 20 having received the S-CSCF response message to be registered transmits the S-CSCF response message to the I-CSCF 106. [

Hereinafter, a call processing method in an IP-based service providing system according to another aspect of the present invention will be described in detail with reference to the flowchart of FIG. 3 together with the above-described configuration.

The P-CSCF 104 transmits a registration request message of the terminal 100 to the I-CSCF 104 by requesting the P-CSCF 104 to register with the P-CSCF 104 (S200) (S202).

Upon receiving the registration request message from the P-CSCF 104, the I-CSCF 106 requests the S-CSCF query to register with the HSS 108 (S204). That is, the I-CSCF 106 transmits the registration request message transmitted from the P-CSCF 104 to the HSS 108 to inquire the S-CSCF to register.

In response to the S-CSCF query request of the I-CSCF 106, the HSS 108 sends a message according to the result of the periodic status check for the S-CSCF group 110, that is, the S-CSCF response message to be registered, to the I- 106 (S206). At this time, the status check of the HSS 108 for the S-CSCF group 110 can be classified into a status check based on the response wait time and a status check based on the number of registered subscribers, as described above with reference to FIG. 2, The I-CSCF 106 sends a result of the status check to the I-

When the HSS 108 receives an S-CSCF response message, i.e., a status check result message for the S-CSCF group 110, to the I-CSCF 106, the response of the HSS 108, The I-CSCF 106 advances the registration request to the corresponding S-CSCF, for example, the S-CSCF1 110/1 according to the response message of the HSS 108 for the query (S208).

When the S-CSCF1 100/1 is selected in the S-CSCF group 110 according to the registration request, the S-CSCF1 110/1 transmits the registration status to the HSS 108 and registers A series of processes for responding to the status is performed (S210) (S212).

Thereafter, the service control between the selected S-CSCF1 100/1 and the terminal 100 is performed by the P-CSCF 104 (S214).

As described above, according to the present embodiment, when a specific S-CSCF is in a failure state or an overload state in an Internet protocol-based call processing environment in which a plurality of S-CSCFs exist, the registration of the corresponding S- For example, an S-CSCF having a fast response time and / or a small number of registered subscribers is registered to provide an efficient call processing environment that maximizes subscriber dispersion and increases service satisfaction.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

The present invention can efficiently perform call processing and subscriber distribution processing, and thus, when an IP (Internet Protocol) based service such as an IMS (IP Multimedia Service) service is commercialized, It is expected to be able to provide.

1 is a block diagram of a call processing apparatus in a service providing system based on an Internet protocol according to an aspect of the present invention;

FIG. 2 is a detailed block diagram of the home subscriber server of FIG. 1;

3 is a flowchart illustrating a call processing method in a service providing system based on an Internet protocol according to another aspect of the present invention.

Description of the Related Art

100: terminal 102: wireless network

104: relay call control function unit 106: inquiry / response call control function unit

108: Home Subscriber Server 110: Serving Call Control Function Group

Claims (21)

When an arbitrary terminal accesses an internet protocol based wireless network and makes a registration request, an arbitrary serving call control function is called according to a result of the periodic status check of the group of the serving call control function of the Internet Protocol- Setting a control function unit, Registering the terminal to the registration target serving call control function unit; And controlling the service between the terminal to be registered and the terminal, The method of claim 1, Transmitting a registration request message to the inquiry / response call control function unit in a relay call control function unit of the Internet Protocol based wireless network; Requesting a registration target serving call control function from the inquiry / response call control function unit to the home subscriber server for the registration request message; And forwarding a response message to the inquiry / response call control function unit according to a result of the periodic state check of the group of the serving call control function of the home subscriber server, The result of the status check is recognized as a reception time of a response message from the serving call control function unit to a check message transmitted from the home subscriber server to an arbitrary serving call control function unit of the serving call control function unit group A method of processing a call in an Internet protocol based service providing system. delete delete The method according to claim 1, As a result of the state check, If the reception time of the response message exceeds a predetermined time, the result is that the serving call control function unit is excluded from the registration target serving call control function unit, or if the reception time of the response message does not exceed the preset time And a result of including the corresponding call control function unit in the registration target serving call control function unit in the Internet protocol based service providing system. 5. The method of claim 4, Based on the reception time of the response message, a serving call control function unit that minimizes the reception time of the response message of the registration target serving call control function unit as a registration target priority. When an arbitrary terminal accesses an internet protocol based wireless network and makes a registration request, an arbitrary serving call control function is called according to a result of the periodic status check of the group of the serving call control function of the Internet Protocol- Setting a control function unit, Registering the terminal to the registration target serving call control function unit; And controlling the service between the terminal to be registered and the terminal, The method of claim 1, Transmitting a registration request message to the inquiry / response call control function unit in a relay call control function unit of the Internet Protocol based wireless network; Requesting a registration target serving call control function from the inquiry / response call control function unit to the home subscriber server for the registration request message; And forwarding a response message to the inquiry / response call control function unit according to a result of the periodic state check of the group of the serving call control function of the home subscriber server, The status check result is determined as the subscriber registration number of each serving call control function unit of the group of the serving call control function A method of processing a call in an Internet protocol based service providing system. The method according to claim 6, And determining a registration target serving call control function unit having the minimum number of registered subscriptions according to the subscriber registration number as a registration target priority. Checking a reception time of a response message from the serving call control function unit with respect to a check message transmitted to an arbitrary serving call control function unit of a group of a serving call control function group of an Internet Protocol based radio network; Checking the subscriber registration number of each serving call control function of the group of the serving call control function; Assigning a registration target priority to the registration target serving call control function unit according to the reception time of the response message and the subscriber registration number; And transmitting, to the Internet Protocol-based wireless network, information about the serving call control function determined in accordance with the registration target priority, when a registration request of the terminal is made through the Internet Protocol based wireless network Based service providing system including the Internet protocol-based service providing system. A relay call control function unit for relaying a registration request message transmitted from a terminal connected to an Internet protocol based wireless network; A query / answer call control function unit for inquiring a registration request message from the relay call control function unit and transmitting a response message to the relay call control function unit; The state information of the group of the serving call control function units is periodically checked and grasped, and when there is a registration request message query from the inquiry / response call control function unit, And a home subscriber server for responding to the registration request message query, The home subscriber server checks the status information of the group of the serving call control function units with reference to the message response wait time or subscriber registration number of each serving call control function unit of the group of the serving call control function A call processing device in an Internet protocol based service providing system. delete 10. The method of claim 9, Wherein the Internet protocol based service providing system is an Internet protocol multimedia subsystem. A query receiving unit for receiving a registration target serving call control function query message corresponding to a registration request message from a terminal connected to an Internet Protocol based wireless network; A subscriber distribution management unit for periodically checking the status of the group of the serving call control function units of the Internet Protocol based wireless network to distributively manage the subscribers; A response to transmit a response message to the registration target serving call control function query message on the basis of the status information of the group of the serving call control function distribution managed by the subscriber distribution management unit according to the registration target serving call control function query message And a transmitter, The subscriber distribution management unit may be configured to determine a reception time of a response message from the serving call control function unit with respect to a check message transmitted to an arbitrary serving call control function unit of the group of the serving call control function unit, And checks and manages the number of registered subscribers to the serving call control function unit A home subscriber server for call processing in an Internet protocol based service providing system. delete 13. The method of claim 12, Wherein the subscriber distribution management unit includes a home for call processing in an Internet protocol based service providing system that excludes a corresponding serving call control function unit from a registration target serving call control function unit when a reception time of the response message exceeds a preset time Subscriber server. 13. The method of claim 12, Wherein the subscriber distribution management unit includes a subscriber distribution control unit for subscribing a subscriber call control function unit to the subscriber call control function unit when the reception time of the response message does not exceed a preset time Home Subscriber Server. 16. The method of claim 15, And a registration target priority of the registration target serving call control function unit is given according to a reception time of the response message. 17. The method of claim 16, Wherein the registration target priority is a serving call control function part in which a reception time of the response message is minimized. 13. The method of claim 12, The subscriber distribution management unit periodically checks the subscriber registration number of each serving call control function unit of the group of the serving call control function groups to distribute the subscriber to the home subscriber server . 19. The method of claim 18, And a registration target priority of the registration target serving call control function unit according to the subscriber registration number. 20. The method of claim 19, Wherein the registration target priority is a serving call control function part having the minimum number of registered subscriber numbers. 21. The method according to any one of claims 12 to 20, The Internet protocol based service providing system is a home subscriber server for processing a call in an Internet protocol based service providing system which is an Internet protocol multimedia subsystem.

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