KR101159026B1 - Method of load distribution of application server in ims network - Google Patents

Abstract

The present invention relates to an AS load distribution method in an IMS network.

An AS load distribution method in an IMS network according to the present invention includes the steps of: (a) receiving a service connection request message of a call; (b) using the subscriber information of the call, extracting a first application service to be provided to the call, and selecting one of a plurality of ASs (application servers) providing the first application service; (c) storing, by the first application service, AS designation information indicating that the selected AS is provided by the selected AS; (d) sending a service connection request message of the call to the selected AS; (e) receiving a service connection request message for the call from the AS receiving the message of step (d); (f) after receiving the message of step (e), using the subscriber information of the call, extracting a second application service to be provided to the call; And (g) if the first application service and the second application service are associated with each other, sending a service connection request message for the second application service to an AS stored in the AS designation information.

 IMS, S-CSCF, Application Server, Load Distribution

Description

AS load distribution method in IMS network {METHOD OF LOAD DISTRIBUTION OF APPLICATION SERVER IN IMS NETWORK}

The present invention relates to an application server load distribution method in a communication network, and more particularly, to an AS load distribution method in an IMS network.

An IP Multimedia Subsystem (IMS) network refers to a communication system that provides various multimedia services such as voice, audio, video, and data to subscribers using an IP (Internet Protocol) based packet network. The 3rd Generation Partnership Project (3GPP) is conducting various standardization studies to smoothly provide ALL IP services through IMS. However, the matters related to AS (Application Server) dualization in IMS network are not defined yet.

In the present invention, AS dualization refers to a structure in which two or more ASs providing the same service are arranged to prepare for a failure of one AS and distribute loads to a plurality of ASs. As the demand for service provision increases, the necessity thereof increases. In particular, as the commercialization of IMS-based Internet telephony (VoIP) service, mobile (VoIP) service, mobile messaging service, etc. is activated, the business demand for AS dualization is increasing.

Therefore, in order to provide a stable service under the AS dualization structure, a method of distributing the load of the AS in consideration of the characteristics of a call requested to the IMS network becomes a problem.

Accordingly, an object of the present invention is to provide a method for implementing AS dualization and distributing load of an AS in consideration of characteristics of a call requested to an IMS network in order to provide a stable and continuous service in an IMS network.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention, which are not mentioned above, can be understood by the following description, and more clearly by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

AS load distribution method in an IMS network according to an embodiment of the present invention for solving the above problems, (a) receiving a service connection request message of the first call; (b) extracting an application service to be provided to the first call by using the subscriber information of the first call and selecting one AS among a plurality of ASs (application servers) providing the application service; (c) if the application service has a characteristic associated with a second call of a subscriber associated with the application service, storing the AS designation information indicating that the application service is provided by the selected AS; And (d) sending the service connection request message of the first call to the selected AS, (e) receiving the service connection request message of the second call during the first call; (f) extracting an application service to be provided to the second call using the subscriber information of the second call; And (g) if the application service to be provided to the second call is the same as the application service to be provided to the first call, sending a service connection request message of the second call to an AS stored in the AS designation information. do.

An AS load distribution method in an IMS network according to another embodiment of the present invention includes: (a) receiving a service connection request message of a call; (b) using the subscriber information of the call, extracting a first application service to be provided to the call, and selecting one of a plurality of ASs (application servers) providing the first application service; (c) storing, by the first application service, AS designation information indicating that the selected AS is provided by the selected AS; (d) sending a service connection request message of the call to the selected AS; (e) receiving a service connection request message for the call from the AS receiving the message of step (d); (f) after receiving the message of step (e), using the subscriber information of the call, extracting a second application service to be provided to the call; And (g) if the first application service and the second application service are associated with each other, sending a service connection request message for the second application service to an AS stored in the AS designation information.

An AS load distribution apparatus in an IMS network according to an embodiment of the present invention includes a receiver for receiving a service connection request message of a first call, a subscriber information acquirer for obtaining subscriber information of the first call, and a first call of the first call. An application server selecting unit which extracts an application service to be provided to the first call using subscriber information and selects one of a plurality of ASs (application servers) providing the application service, wherein the application service is the application service; If there is a characteristic associated with the second call of the subscriber associated with, the application service is a dependency processing unit for storing the AS designation information indicating that provided by the selected AS and transmitting the service connection request message of the first call to the selected AS It includes a transmitter.

An AS load distribution apparatus in an IMS network according to another embodiment of the present invention, by using a receiver for receiving a service connection request message of a call, a subscriber information obtaining unit for obtaining subscriber information of the call, and obtained subscriber information of the call, An application server selection unit for extracting a first application service to be provided to the call and selecting one AS among a plurality of ASs (application servers) providing the first application service, wherein the first application service is the selected AS And a dependency processing unit for storing the AS designation information indicating that is provided by the UE, and a transmitter for transmitting the service connection request message of the call to the selected AS.

According to the present invention, it is possible to provide stable and uninterrupted service by implementing AS dualization in the IMS network and distributing the load of the AS in consideration of the characteristics of calls requested to the IMS network.

The above objects, features, and advantages will be described in detail with reference to the accompanying drawings, whereby those skilled in the art to which the present invention pertains may easily implement the technical idea of the present invention. In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention implements AS dualization by grouping application servers that provide the same service in the IMS network, and distributes the load of the AS in consideration of characteristics of calls requested to the IMS network, thereby providing stable and continuous service. Can be.

1 is a block diagram showing the structure of an IMS network according to an embodiment of the present invention.

The IMS network may include the S-CSCF 100, the DNS 120, and the application servers 132, 134, 142, and 144.

Serving-Call Session Control Function (S-CSCF) 100 performs session control in the IMS network and decides which application server (AS) to connect to to provide the service that subscribers want to use. do.

The Domain Name System (DNS) 120 sets a plurality of ASs providing the same service into one AS group, and stores the names of the ASs belonging to each AS group and the IP addresses of each AS. When receiving information about a specific AS group from the S-CSCF 100, it informs a plurality of ASs belonging to the requested AS group and IP addresses of each AS.

An application server (Application Server: 132, 134, 142, 144, hereinafter 'AS') exchanges messages with the S-CSCF 100 using SIP (Session Initiation Protocol) and provides application services. The AS may be located in a home network with the S-CSCF 100 or in a network outside the home network.

Hereinafter, a method of implementing an AS dualization structure in an IMS network will be described with reference to FIG. 1.

AS dualization refers to a structure that can provide stable services by arranging two or more ASs providing the same service, in case of any one AS failure and by distributing load to a plurality of ASs. In this case, the AS providing the same service may be arranged at different locations in different regions. Of course, the AS dualization structure can be extended to the AS multiplexing structure by arranging two or more AS providing the same service.

First, two or more ASs providing the same service are set up as one AS group. Therefore, two or more ASs configured in one AS group may provide the same application service.

1 shows an AS dualization structure including two ASs in one AS group. AS group-A 130 includes AS1 132 and AS2 134, and AS group-B 140 includes AS1 142 and AS2 144. For example, AS1 132 and AS2 134 belonging to AS group-A 130 provide application services 1, 2 and 3, and AS1 142 and AS2 (belonging to AS group-B 140). 144 may provide application services 11, 12, and 13.

With reference to Table 1, the grouping setting method of AS is demonstrated.

Table 1 shows an embodiment in which information about an AS group called asgrp.kt.com is set in DNS. That is, information about two or more ASs belonging to each AS group can be set. In addition, information required to determine which of two or more ASs belonging to the same AS group to distribute loads can be set in the DNS.

* DNS Server Setting Information
_sip._udp.asgrp SRV 0 1 6000 as1.kt.com. / * Priority = 0, Weight = 1 * /
_sip._udp.asgrp SRV 1 1 6000 as2.kt.com. / * Priority = 1, Weight = 1 * /

as1 A 172.16.15.1
as2 A 172.16.15.2

Referring to Table 1, the AS group called asgrp.kt.com includes a first AS called as1.kt.com and a second AS called as2.kt.com. In addition, the IP address of the first AS is 172.16.15.1, and the IP address of the second AS is 172.16.15.2.

In addition, information necessary to determine which of the first AS (as1.kt.com) and the second AS (as2.kt.com) belonging to the AS group called asgrp.kt.com to distribute the load, For example, priority and weight may be set for each AS. First, the load of the AS is distributed according to the priority, and if the priority is the same, the load of the AS is distributed according to the weight.

Taking Table 1 as an example, the first AS (as1.kt.com) has a priority of 0 and a weight of 1, and the second AS (as2.kt.com) has a priority of 1 and a weight of 1. . Therefore, when a request for the corresponding application service is received, the trigger is triggered to a first AS (as1.kt.com) having a high priority, and the first AS (as1.kt.com) provides a service due to a failure or the like. If not (out of service) it is triggered by a second AS (as2.kt.com) having the next priority.

According to another embodiment, the priority and weight of each AS belonging to the same AS group may be set equally, and the load may be distributed to each AS at the same rate by using various methods such as round robin. At this time, it is necessary to distribute the load of the AS in consideration of the characteristics of the call requesting service provision. Hereinafter, this will be described in detail with reference to FIGS. 2 and 3.

First, an application service related to a plurality of calls of a subscriber is a problem. For example, a case in which subscriber C requests subscriber A (call 2) during the call (number 1) requested by subscriber A to subscriber B will be described. At this time, if the subscriber A is a subscriber of the call waiting service, the subscriber A can call the subscriber C while waiting for the call with the subscriber B. You can talk. To do this, the service for the first call between subscriber A and subscriber B and the service for the second call between subscriber A and subscriber C must be provided in the same AS.

The load distribution method of the AS for this purpose will be described with reference to FIG.

2 is a diagram illustrating a load distribution method of an AS in consideration of characteristics of a call in an IMS network according to an embodiment of the present invention.

The S-CSCF 100 may include an apparatus 110 for storing and managing subscriber profiles. That is, the terminal subscriber's profile is downloaded from the home subscriber server (HSS) through a registration procedure of each terminal, and stored in the SDM 110. The S-CSCF 100 may be implemented as one, or as a plurality of S-CSCF (101, ... 10n) as shown in FIG. When implemented with a plurality of S-CSCFs (101, ... 10n), the SDM (110) that stores and manages the profile of the terminal subscriber is accessed from the plurality of S-CSCFs (101, ... 10n) It can be implemented to make it possible.

First, the S-CSCF1 101 receives a service connection request message of a first call (202).

Upon receiving the service connection request message 202 of the first call, the S-CSCF1 101 requests the information of the subscriber of the first call to the SDM 110 (204) and receives it (206). For example, the S-CSCF1 101 receiving the first service connection request message 202 requesting the subscriber B from the subscriber A requests the SDM 110 with the information of the subscriber A and the subscriber B (204). Receive (206). In this case, the subscriber information 206a includes iFC (Initial Filter Criteria) information downloaded from the HSS when the subscriber A and the subscriber B register their terminals.

The S-CSCF1 101 finds an AS group capable of providing a service to the first call by analyzing service trigger conditions of the subscriber A and the subscriber B of the first call using the iFC information (208). In this case, the S-CSCF1 101 may analyze various service trigger conditions by combining information of the subscriber A and the subscriber B, the calling number and the called number, and the information included in the service connection request message of the first call.

As a result of analysis using the subscriber information 206a of the first call received from the SDM 110, the AS group of the first call is a call waiting service subscriber and an AS group capable of providing the call waiting service. Becomes "asgrp1.ktann.com" (208).

The S-CSCF1 101 queries the DNS 120 for information about the AS group (asgrp1.ktann.com) extracted in step 208 (210).

As described in Table 1, the DNS 120 stores information about each AS group (120a). Receiving the 210 message, the DNS 120 transmits the information 212a of the AS group (asgrp1.ktann.com) to the S-CSCF1 101 (212).

The S-CSCF1 101 selects one AS using the information 212a of the received AS group (asgrp1.ktann.com) (214). At this time, since the first AS (gras1.ktann.com:132) and the second AS (hhas1.ktann.com:134) belonging to the AS group (asgrp1.ktann.com) have the same priority and weight, S-CSCF1 101 may select a second AS (hhas1.ktann.com:134) according to a predetermined algorithm (214).

In this case, the preset characteristic of the application service to be provided to the first call is checked (216). For example, as described above, when one or more of the first call subscribers are call waiting service subscribers, and the second call to which the call waiting service subscribers of the first call belong during the first call is requested. In this case, subheadings 1 and 2 shall proceed in the same AS. In the present invention, such as a call waiting service, when a plurality of calls of a subscriber to be provided with the service must be provided in the same AS in order to provide the service, the service is said to have inter-call dependencies. The operator can preset the service having the inter-call dependency in the system in advance. In one embodiment, a Public Service ID (PSI), which is a userpart of an AS name in iFC, may be registered in the IMS system, and the corresponding application service may be configured to have inter-call dependencies. In this case, the operator may preset the characteristic information of the application service in the S-CSCF 100.

If the operator knows that the call waiting service is a call-to-call dependency (216) from the characteristic information of the application service preset by the operator, the S-CSCF1 101 calls the subscriber A, the subscriber who is the call waiting service. The AS providing the mid-wait service transmits a message 218 to the SDM 110 requesting to store that the second AS (hhas1.ktann.com) in the AS group (asgrp1.ktann.com) is selected (218). ).

Receiving message 218, the SDM 110 stores the IP address (xxx.xxx.222.222) of the second AS (hhas1.ktann.com) selected as an AS providing a waiting-waiting service to subscriber A, such as 220a. Thereafter, the response message 220 is transmitted to the S-CSCF1 101.

Thereafter, the S-CSCF1 101 transmits the service connection request message of the first call to the second AS (hhas1.ktann.com:134) (222).

During the progress of the first call, the second call may be received at the S-CSCF (224). In this case, the second call may be received by the same S-CSCF1 101 as the S-CSCF controlling the first call, or may be received by another S-CSCFn 10n. Upon receiving the service connection request message 224 of the second call, the S-CSCFn 10n requests 226 the SDM 110 to receive information of the subscriber of the second call (228). For example, the S-CSCFn 10n receiving the second service connection request message 224 requested by the subscriber C to the subscriber A may request the SDM 110 for the information 228a of the subscriber A and the subscriber C. 226 may be received 228.

The S-CSCFn 10n uses the iFC information 228a to analyze the service trigger conditions of the subscriber A and the subscriber C of the second call, thereby finding an AS group capable of providing the service to the second call (230). ). First, since subscriber A is a call waiting service subscriber, it can be seen that the AS group that can provide call waiting service to subscriber A is asgrp1.ktann.com. In this case, it can be seen from the information stored in 220a that the first call of subscriber A is in progress and the first call of subscriber A is in service in the second AS (xxx.xxx.222.222) in the AS group (asgrp1.ktann.com). have. As a result, the S-CSCFn 10n may transmit the service connection request message of the second call to the second AS (xxx.xxx.222.222: 134) instead of the first AS (xxx.xxx.111.111: 132) ( 232).

The AS load distribution method in the case of the inter-call dependency described above can be extended to not only two calls but also three or more calls.

Then, the case where a plurality of services are triggered in one call may be a problem. For example, a first service and a second service are triggered in a call requested by subscriber D to subscriber E, and the first service and the second service are associated with each other and provided in the same AS because one is dependent on the other. Cases may arise. In the present invention, it is said that there is an in-call dependency when a plurality of services triggered in one call are to be provided through the same AS in association with each other.

A load distribution method of the AS for this purpose will be described with reference to FIG. 3.

3 is a diagram illustrating a load distribution method of an AS in consideration of characteristics of a call in an IMS network according to another embodiment of the present invention.

First, S-CSCF1 101 receives a service connection request message of a call (302).

Receiving the service connection request message 302 of the call, the S-CSCF1 101 requests (306) and receives (306) information of the subscriber of the requested call from the SDM 110. Description of this is as described with reference to FIG. 2.

The S-CSCF1 101 uses the iFC information 306a to analyze the service trigger conditions of subscribers D and E, which are subscribers of the requested call, to find an AS group capable of serving the call. (308). Description of this is as described with reference to FIG. 2.

As a result of analysis using the subscriber information 306a of the call received from the SDM 110, the application service to be provided to the calls of subscribers D and E is, first, a first application service having a high priority (n-1). (308). An AS group capable of providing a first application service, which is an application service to be provided first, becomes “asgrp1.ktann.com” (308).

The S-CSCF1 101 queries the DNS 120 for information about the AS group (asgrp1.ktann.com) extracted in step 308 (310).

As described in Table 1, the DNS 120 stores information about each AS group (120a). Upon receiving message 310, the DNS 120 transmits information 312a of the AS group (asgrp1.ktann.com) to the S-CSCF1 101 (312).

The S-CSCF1 101 selects one AS using the information 312a of the received AS group (asgrp1.ktann.com) (314). Detailed description thereof is the same as in FIG. 2. For example, the S-CSCF1 101 may select a second AS (hhas1.ktann.com:134) according to a predetermined algorithm (314).

At this time, the information about the AS determined to provide the first application service is stored in the requested call (316). After providing the first application service, in order to be triggered by the second application service associated with the first application service, the IP information of the AS determined in step 314 is stored. In an embodiment, the IP information of the AS determined in step 314 may be stored in session information in the S-CSCF 100. That is, in order to provide the triggered first application service and the second application service for the same session, it may be stored in session information in the S-CSCF 100.

For the call of subscribers D and E, it may be determined in step 308 whether it is triggered by the associated second application service after the first application service or in step 322 which will be described later.

That is, in the first embodiment, the S-CSCF1 101 retrieves all the information of 306a so that the call of subscribers D and E has an in-call dependency triggered by the second application service associated after the first application service. You can judge at the stage. In this case, the IP information of the AS determined in step 314 may be stored for in-call dependency processing (316). In a second embodiment, after retrieving the information of 306a and extracting the first application service, if it is determined by the method described in step 216 of FIG. Since the call of may have a dependency within the call, the IP information of the AS determined in step 314 is stored (316). According to the second embodiment, as determined in step 322 to be described later, when the call of subscribers D and E is triggered by the associated second application service after the first application service, the information stored in advance in step 316, that is, the first By using the IP address of the AS providing the application service, the second application service may also be provided by the AS providing the first application service.

S-CSCF1 101 sends a service connection request message of the call 302 of subscriber D and subscriber E to the second AS (hhas1.ktann.com:134) (318).

After the second AS 134 provides the first application service to subscribers D and E's call 302, the service connection request to request subsequent call processing for subscribers D and E's call 302 The message is sent to the S-CSCF1 101 (320). In this case, the S-CSCF1 101 transmits a message 320 including the same ODI as the ODI (Original Dialog ID) of the message requested in step 318, so that the call service connection request message of step 320 is connected to the call requested in step 302. The S-CSCF1 101 may be informed that it is requesting further processing for the same call and not another call.

Receiving the service connection request message 320 of the call from the second AS 134, the S-CSCF1 101 uses the information of 306a so that the application service to be provided after the first application service has a next priority (n). It can be seen that the AS group capable of providing a second application service, which is), is asgrp1.ktann.com. At this time, after the first application service is provided from the second AS (xxx.xxx.222.222) of the AS group called asgrp1.ktann.com for the same session from the information stored in step 316, the call of subscribers D and E is performed. The service connection request message of 302 is transmitted to the second AS (hhas1.ktann.com:134) (324).

As such, S-CSCF1 101 sends a message to the second AS (xxx.xxx.222.222: 134) requesting to provide a second application service associated with the first application service for subscribers D and E's call 302. (324).

The AS load distribution method in the case where there is an intra-call dependency described above can be extended to not only two services but also three or more services that are multi-triggered.

4 is a block diagram showing a configuration of a load distribution device of an AS in an IMS network according to an embodiment of the present invention.

The AS load distribution apparatus 400 includes a receiver 402, a subscriber information acquirer 404, an application server selector 406, a dependency processor 408, and a transmitter 410.

First, the case where there is an inter-call dependency will be described. Parts described above in FIG. 2 will be omitted.

The receiving unit 402 may receive the service connection request message of the first call after receiving the service connection request message of the first call. For example, the receiver 402 may receive the INVITE 202, 224 message of FIG. 2.

When the receiver 402 receives the service connection request message of the call, the subscriber information acquirer 404 acquires the information of the subscriber of the received call. That is, when the receiver 402 receives the service connection request message of the first call, acquires information of the subscriber of the first call, and when the receiver 402 receives the service connection request message of the second call, the information of the subscriber of the second call. Acquire it. For example, as described with reference to FIG. 2, the subscriber information may be obtained from the SDM 110.

The application server selecting unit 406 extracts an application service to be provided to the first call by analyzing a service trigger condition of the corresponding subscriber by using the subscriber information of the first call acquired by the subscriber information obtaining unit 404, and applies the corresponding application. Find an AS group that can provide services. Thereafter, one AS is selected according to a predetermined algorithm in the corresponding AS group. When the service connection request message of the second call is received, the application server selecting unit 406 analyzes the service trigger condition of the corresponding subscriber by using the subscriber information of the second call obtained from the subscriber information obtaining unit 404, Extract the application services to be provided in Issue 2. For example, as described in the call waiting service, if the application service to be provided to the second call is the same as the application service provided to the first call, the AS to be provided later will be designated as to be provided later. Select the AS stored in the information.

As described in step 216 of FIG. 2, the dependency processing unit 408 examines a predetermined characteristic of an application service to be provided to the first call, and when the application service to be provided to the first call is a service having an inter-call dependency. For example, the information indicating that the application service to be provided for the first call is provided by the AS selected by the application server selecting unit 406 (hereinafter, 'AS designation information') is stored in the trigger condition of the corresponding subscriber in the SDM 110.

The transmitter 410 transmits the service connection request message of the call received by the receiver 402 to the AS selected by the application server selector 406.

Next, the case where there is in-call dependency is demonstrated. Parts already described with reference to FIGS. 2 and 3 will be omitted.

The receiver 402 receives a service connection request message of a call. For example, the receiver 402 may receive the INVITE 302, 320 message of FIG. 3.

When the receiver 402 receives the service connection request message of the call, the subscriber information acquirer 404 acquires the information of the subscriber of the received call. For example, the subscriber's information may be obtained from the SDM 110.

The application server selecting unit 406 extracts the first application service to be provided to the call by analyzing the service trigger condition of the corresponding subscriber by using the subscriber information of the call acquired by the subscriber information obtaining unit 404, and the first application service. Find an AS group that can provide. Thereafter, one AS is selected according to a predetermined algorithm in the corresponding AS group. When the service connection request message of the call as shown in 320 of FIG. 3 is received from the AS that the receiver 402 provides the first application service, the application server selecting unit 406 receives the call obtained from the subscriber information obtaining unit 404. The second application service to be provided to the call is extracted by analyzing the service trigger condition of the corresponding subscriber using the subscriber information. If there is an in-call dependency that the first application service and the second application service are related to each other and need to be provided in the same AS, the AS stored in the AS designation information to be described later is selected for the AS to provide the second application service.

As described with reference to FIG. 3, the dependency processing unit 408 selects the first application service as an application server in case there is an in-call dependency in which the first application service and the second application service are related to each other and need to be provided from the same AS. The information (AS designation information) indicating that the AS selected in the section 406 is provided is stored in the session information of the call. In addition, when it is determined in step 308 that there is an intra call dependency, the AS designation information may be stored in the session information of the call.

The transmitter 410 transmits the service connection request message of the call received by the receiver 402 to the AS selected by the application server selector 406.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

The present invention can be used to provide stable and continuous service by implementing AS dualization in the IMS network and distributing the load of the AS in consideration of the characteristics of the call requested in the IMS network.

1 is a block diagram showing the structure of an IMS network according to an embodiment of the present invention.

2 is a diagram illustrating a load distribution method of an AS in consideration of characteristics of a call in an IMS network according to an embodiment of the present invention.

3 is a diagram illustrating a load distribution method of an AS in consideration of characteristics of a call in an IMS network according to another embodiment of the present invention.

4 is a block diagram showing a configuration of a load distribution device of an AS in an IMS network according to an embodiment of the present invention.

Claims (11)

(a) receiving a service connection request message of a first call; (b) extracting an application service to be provided to the first call by using the subscriber information of the first call and selecting one AS among a plurality of ASs (application servers) providing the application service; (c) if the application service has a characteristic associated with a second call of a subscriber associated with the application service, storing the AS designation information indicating that the application service is provided by the selected AS; And (d) sending the service connection request message of the first call to the selected AS, (e) receiving a service connection request message of the second call while the first call is in progress; (f) extracting an application service to be provided to the second call using the subscriber information of the second call; And (g) if the application service to be provided to the second call is the same as the application service to be provided to the first call, transmitting the service connection request message of the second call to an AS stored in the AS designation information. , AS load distribution method in IMS network. The method of claim 1, In step (b), selecting the one AS from the AS group providing the application service to be provided to the first call, The AS group. AS load distribution method in an IMS network consisting of two or more ASs providing the same application service. The method of claim 1, The characteristic of the application service is a preset AS load distribution method in the IMS network. The method of claim 1, The AS assignment information is stored in a service trigger condition of a subscriber related to the application service. delete The method of claim 1, The subscriber information is information received from a Home Subscriber Server (HSS) at the time of registration of the subscriber, and includes iFC (Initial Filter Criteria) information which is a service trigger condition of the subscriber. (a) receiving a service connection request message of a call; (b) using the subscriber information of the call, extracting a first application service to be provided to the call, and selecting one of a plurality of ASs (application servers) providing the first application service; (c) storing, by the first application service, AS designation information indicating that the selected AS is provided by the selected AS; (d) sending a service connection request message of the call to the selected AS; (e) receiving a service connection request message for the call from the AS receiving the message of step (d); (f) after receiving the message of step (e), using the subscriber information of the call, extracting a second application service to be provided to the call; And (g) if the first application service and the second application service are associated with each other, sending a service connection request message for the second application service to an AS stored in the AS designation information. AS load distribution on UNIX. The method of claim 7, wherein The subscriber information is information received from a Home Subscriber Server (HSS) at the time of registration of a subscriber, and includes iFC (Initial Filter Criteria) information which is a service trigger condition of the subscriber. The method of claim 7, wherein In step (b), selecting the one AS from the AS group providing the first application service to be provided to the call, The AS group is composed of two or more AS providing the same application service, AS load distribution method in an IMS network. The method of claim 7, wherein The AS designation information is stored in the session information of the call. delete

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