KR20110040151A - Proxy cscf registeration method in ims network and system thereof - Google Patents

Abstract

PURPOSE: A proxy CSCF registration method in an IMS network and a system thereof are provided to easily perform a PSSCF distribution operation according to the policy defined by a business provider. CONSTITUTION: A terminal(100) gets information of a redirect server(300) through a query of a DNS(Domain Name Server). The terminal transfers a REGISTER message to a redirect server. The redirect server extracts at least one of proxy CSCF(300-320) within a network as a PCSCF(Proxy Call Session Control Function). The terminal transfers the REGISTER message to a received selection PCSCF. Then, the call processing of the terminal performs through the selection PCSCF.

Description

Proxy CSCF Registration Method in IMS Network and System About

The present invention relates to a method for registering a Proxy CSCF (hereinafter referred to as PCSCF) in an IMS network. More specifically, when there are a plurality of PCSCFs accessible to a terminal in an IMS network, the call processing of the terminal is efficiently performed with each PCSCF. It is about distributing with

In the IMS (IP Multimedia Subsystem), there is a Call Session Control Function (CSCF) that performs call processing. CSCF (Call State Control Function) is a function that is in charge of the part related to call and session processing, Incoming Call Gateway, Call Control Function, and SPD (Serving Profile Database) function , Address handling function.

Functioning as a gateway for an incoming call means acting as an entry point and performing routing for the incoming call. It also performs service triggering on incoming calls such as call screening and forwarding, and is responsible for communicating with the HSS.

Call control functions are responsible for establishing and terminating calls, managing status / events, interacting with MRF for multiparty services, reporting call events for billing, and receiving and processing application level registrations.

The SPD communicates with the HSS of the home domain to manage user profile information and performs a similar function to the existing VLRs that inform the home domain when the user first accesses it.

CSCF can be divided into P-CSCF (Proxy), I-CSCF (Interrogating), and S-CSCF (Serving) according to its function. Proxy Call State Control Function (P-CSCF) is a point where UE (UE) first encounters when accessing IMS through GPRS access. In other words, the terminal or user equipment (UE) is the first point of access to the IMS and exists in the same domain as the GGSN. 3GPP proposes a method by which a terminal uses DHCP to find a PCSCF or obtains an address through a PDP context. Of course, IMS is not only connected through GPRS access, but also can be accessed through any wired or wireless IP access.

1 is a diagram illustrating a process of obtaining information of a PCSCF by a terminal.

As shown in Figure 1, the terminal includes a list of PCSCF. First, the terminal 100 inquires the information of the first PCSCF (P-CSCF # 1) to the domain server (DNS Server, 200) (S410). If it fails to obtain the information through such a query (S420), the next PCSCF information to the domain server 200, and receives the response (S430, S440). When the information of the PCSCF is successfully received from the DNS server 200, the process of registering with the PCSCF (320) (S450).

However, the PCSCF registration procedure according to the conventional method described above may be performed when the point at which the PCSCF is selected is located in the terminal, and thus the terminal cannot obtain a list of Proxy CSCFs (for example, when DHCP cannot give the PCSCF information). However, there may be restrictions when the network operator wishes to define a PCSCF distribution policy.

The present invention has been made in view of the above circumstances, and an object of the present invention is that a point for selecting a PCSCF is located in a terminal, so that the terminal cannot obtain a list of Proxy CSCFs, that is, DHCP fails to give the PCSCF information. The present invention provides a method for preventing a situation in which a PCSCF cannot be registered, etc., and more efficiently when a network operator wants to define a PCSCF distribution policy.

The PCSCF registration system in the IMS network according to the present invention for achieving the above object is a system that supports IP Multimedia Subsystem (IMS) registration of the terminal, receives a registration message (REGISTER) from the terminal, one or more PCSCF list Redirect server including a, Redirect server for transmitting a response message including the information of the selected PCSCF selected one of the one or more PCSCF of the selected PCSCF; And a terminal that transmits a registration message to the rescanning server, and then re-registers by transmitting a registration message to the selected PCSCF included in the received response message.

On the other hand, the Redirect server for PCSCF registration in the IMS network according to the present invention includes a registration message receiving module for receiving a registration message (REGISTER) from the terminal; A PCSCF selection module including a list of one or more PCSCFs and selecting one of the one or more PCSCFs; And a response message transmission module for transmitting a response message including the information of the selected PCSCF to the terminal.

The rescanning server further includes a terminal capability determining module that determines whether the terminal supports a function capable of processing the response message, and when the terminal supports the function, the response message transmission function. It is preferable to carry out.

In addition, the terminal capability determination module extracts a header value from the registration message (REGISTER), compares the value of the extracted header with a pre-stored list value, and supports whether the terminal can process the response message. It is desirable to determine whether or not.

The PCSCF selection module preferably includes a header extraction module for extracting a header value from the registration message (REGISTER) and a PCSCF extraction module for extracting a selected PSCF by comparing the extracted header value with a previously stored list value. Do.

In addition, the PCSCF selection module preferably selects the selection PSCF based on capacity values of the one or more PCSCFs.

And the PCSCF selection module includes a total calculation module for calculating a total of capacities of the one or more PCSCFs. A range calculation module for calculating a range corresponding to each capacity for each of the one or more PCSCFs; An operation performing module for extracting a specific random value X and performing a module operation on the sum calculated in the sum calculating step to calculate a result value; And a PCSCF determination module for selecting the PCSCF having a range to which the result value belongs as the selection PCSCF.

In addition, the PCSCF determination module preferably selects any one at random when there are two or more PCSCFs in the range.

In addition, the total calculation module is characterized in that it does not overlap if there are PCSCFs having the same capacity, it is preferable that the range calculation module calculates the same range between PCSCFs having the same capacity.

On the other hand, the PCSCF registration method in the MS network according to an embodiment of the present invention includes a registration step of the terminal transmits a registration message (REGISTER) to the re-search server; A PCSCF selection step of the rescanning server selecting a selection PCSCF which is any one of one or more PCSCFs; A response message transmission step of transmitting a response message including the information of the selected PCSCF to the terminal; And a re-registration step of the terminal transmitting a registration message to the selected PCSCF and attempting to re-register with the selected PCSCF.

And a terminal capability determining step of determining whether the terminal supports a function capable of processing the response message. If the terminal supports the function, the response message transmitting step and the re-registration step are performed. It is preferable to carry out.

In addition, the terminal capability determination step extracts the header value from the registration message (REGISTER), and compares the extracted header value with a pre-stored list value and whether the terminal supports the function of processing the response message. It is desirable to determine whether or not.

The PCSCF selection step preferably includes a header extraction step of extracting a header value from the registration message (REGISTER) and a PCSCF extraction step of extracting a selected PSCF by comparing the extracted header value with a previously stored list value. Do.

In the PCSCF selection step, the selection PSCF may be selected based on a capacity value of the one or more PCSCFs.

And the PCSCF selection step includes a total calculation step of calculating a sum of capacities of the one or more PCSCFs; A range calculating step of calculating a range corresponding to each capacity for each of the one or more PCSCFs; After extracting a specific random value X, performing a module operation with the sum calculated in the total calculation step to calculate a result value and selecting the PCSCF having a range to which the result value belongs as the selection PCSCF It is preferable to include the PCSCF determination step.

As described in detail above, by using the PCSCF registration system and the PCSCF registration method in the IMS network according to the present invention, PCSCF can be processed more efficiently during registration.

In particular, the PCSCF registration method proposed in this patent is performed by a component in a network called a redirect server, unlike the method performed in the existing terminal, and according to the policy defined by the operator (by subscriber or capacity). The PCSCF distribution can be facilitated accordingly. In addition, the terminal may be compatible with an existing terminal that does not support interworking with the search server, including checking whether the terminal supports redirection processing through a 305 User Proxy message.

Hereinafter, a PCSCF registration system and a PCSCF registration method in an IMS network according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

2 is a diagram illustrating a process of obtaining information of a PCSCF by a terminal according to an embodiment of the present invention.

In FIG. 2, unlike the related art, a PCSCF (Proxy CSCF) distribution function may be used through a network configuration having a redirect server 300. Here, the rescanning server may be configured as a newly configured server only for the distribution of the PCSCF, while it is also possible to further include a distribution function for the present invention in the PCSCF.

First, the access node of the IMS network known to the terminal becomes the rescanning server 300. Accordingly, the terminal first obtains information of the rescanning server 300 through a DNS query (S460 and S470).

Thereafter, the registration information (REGISTER) message, which is an initial registration SIP message, is transmitted to the rescanning server 300 using the obtained information (S480).

The rescanning server 300 receiving the registration message transmitted by the terminal extracts one of the one or more Proxy CSCFs present in the network to the selected PCSCF (S485).

Thereafter, the rescanning server 300 transmits a 305 Use Proxy response message including the information of the selected PCSCF to the terminal 100 (S490).

The terminal 100 retries the registration process by transmitting a registration message to the selected PCSCF 320 received through the 305 Use Proxy response message, and then the call processing of the terminal 100 is performed through the selected PCSCF 320. (S495).

As in the prior art, since the point for selecting the Proxy CSCF is not the terminal but the rescan server which is one of the constituent nodes of the network, the terminal call processing distribution to the Proxy CSCF can be made in various forms.

3 is a block diagram illustrating a rescan server according to an embodiment of the present invention.

The re-search server 300 according to an embodiment of the present invention includes a registration message receiving module 301 for receiving a registration message (REGISTER) from a terminal, one or more PCSCF lists, and among the one or more PCSCFs. PCSCF selection module 303 for selecting a selected PCSCF, a terminal capability determination module 304 for determining whether the terminal supports a function capable of processing a response message, and a response message including information of the selected PCSCF. It includes a response message transmission module 302 for transmitting to the terminal.

The terminal capability determination module 304 extracts a header value from the registration message (REGISTER), compares the extracted header value with a pre-stored list value, and performs a function for the terminal to process the response message. It is characterized by determining whether or not to support.

The PCSCF selection module 303 is a total calculation module 305 that calculates a sum of the capacities of one or more PCSCFs, and a range calculation module that calculates a range corresponding to each capacity for each of the one or more PCSCFs. 306, a PCSCF having a range to which the operation value module 307 which calculates a result value by extracting a specific random value X and performing a module operation on the sum calculated in the sum calculation step; PCSCF decision module 308 to select a as the selection PCSCF.

Meanwhile, in order to perform the content illustrated in FIG. 2, the terminal 100 should be able to process a response message (305 Use Proxy) received from the rescanning server 300. That is, it should be possible to receive a response message and redirect the registration message to the selected PCSCF included in the received response message.

However, among the terminals existing in the 3GPP IMS network, when a 305 Use Proxy message is received, there may be a terminal capable of processing redirection and a terminal that is not, and in this case, the rescanning server 300 Prior to receiving a registration message from the terminal 100 and selecting a PCSCF to be transmitted to the terminal 100, whether the terminal 100 which previously transmitted the registration message supports a redirection processing function through a 305 Use Proxy message. Check it.

The redirection processing function confirmation through the 305 Use Proxy message of the terminal 100 is determined based on the contents of a REGISTER message received from the terminal. The re-search server 300 manages a list of names and contents of headers of SIP message headers to be used when checking a redirection processing function of the terminal. Upon receiving a REGISTER message, a process of extracting a value of a header defined in a list and comparing whether a corresponding value is included or not is performed for all set headers.

4 is a diagram illustrating an embodiment of a header included in a registration message. As shown in the figure, the type of the terminal can be determined through the header included in the registration message.

The list information on the name of the SIP message header and the contents of the header is used as information for identifying a terminal that does not support the redirection processing function through the 305 Use Proxy message. Alternatively, the name of the SIP message header and the list information on the contents of the header may be used as information for identifying a terminal supporting a redirection processing function through a 305 Use Proxy message.

If it is determined that the terminal 100 supports the 305 Use Proxy message processing function using the information, the terminal 100 re-registers with the selected PCSCF again according to the response message sent from the retransmission server 300. The processing is possible, as described above with reference to FIG.

If it is determined that the terminal 100 does not support the retransmission processing function through the 305 Use Proxy message, the corresponding Proxy CSCF 300 including the function of the rescanning server 300 as shown in FIG. 3 will be described later. Perform the direct registration process.

FIG. 5 is a diagram illustrating a processing process when a terminal does not support a function for processing a response message according to an embodiment of the present invention.

First, the access node of the IMS network known to the terminal becomes the rescanning server 300. Accordingly, the terminal first obtains information of the rescanning server 300 through a DNS query (S510, S515).

Thereafter, the registration information (REGISTER) message, which is an initial registration SIP message, is transmitted to the rescanning server 300 using the obtained information (S520).

At this time, when the rescanning server 300 determines through the header of the registration message, if the terminal 100 does not support the retransmission processing function through the 305 Use Proxy message, the rescanning server 300 immediately The direct registration process is performed, and afterwards, registration is performed with the ICSCF 370 and the SCSCF 380 (S520 and S525. S528). The rescanning server 300 may be registered as a PCSCF directly as a rescanning function for the present invention is included in the PCSCF.

6A and 6B illustrate a process of selecting a PCSCF using a header value according to an embodiment of the present invention.

This is called a Dedicated Proxy CSCF (Method of Selecting Dedicated Proxy CSCF), and selects a specific PCSCF preset according to a pattern of a public user identity of a subscriber who transmits a registration message.

As illustrated in FIG. 6, the rescanning server 300 has a configuration in which PCSCF information for processing the corresponding terminal is mapped for each pattern of the public user identity. As shown in FIG. 6, in case of 011, (10, 10, 10, 10: 5060) is mapped to the selected PCSCF, and in case of 010, it is mapped to (10, 10, 10, 20: 5060) as the selected PCSCF.

A process of selecting the selected PCSCF using this mapping information will be described later in more detail with reference to FIG. 6B.

First, since the access node of the IMS network known to the terminal is the rescanning server 300, the terminal 100 first obtains information of the rescanning server 300 through a DNS query (S540 and S545).

Thereafter, using the obtained information, a registration (REGISTER) message, which is an initial registration SIP message, is transmitted to the rescanning server 300 (S550). At this time, the registration message includes the information (to: 0112345678@test.com).

The rescanning server 300 extracts information corresponding to the information included in the registration message from previously stored PCSCF information for each pattern. A PCSCF corresponding to 011 (10, 10, 10, 10: 5060) is extracted as the selected PCSCF through the registration message (S555).

Thereafter, the rescanning server 300 transmits a 305 Use Proxy response message including the information 10, 10, 10, 10: 5060 of the selected PCSCF to the terminal 100 (S560).

The terminal 100 retries the registration process by transmitting a registration message to the selected PCSCF 310 received through the 305 Use Proxy response message, and then the call processing of the terminal 100 is performed through the selected PCSCF 310. (S570).

7A to 8B illustrate a process of selecting a PCSCF according to a capacity value of each PCSCF according to an embodiment of the present invention.

It is also called a random PCSCF (Arbitrary Proxy CSCF) selection method by selecting PCSCF according to the capacity value. This random PCSF selection is performed when no matching pattern exists in the independent PCSCF selection scheme described above.

First, as shown in FIG. 7A, the terminal 100 first obtains information of the rescanning server 300 through a DNS query (S610 and S615).

Thereafter, the registration (REGISTER) message, which is the initial registration SIP message, is transmitted to the rescanning server 300 using the obtained information (S620).

The rescanning server 300 extracts the selected PCSCF by using previously stored capacity information for each PCSCF (S630).

Thereafter, the rescanning server 300 transmits the 305 Use Proxy response message including the information of the selected PCSCF to the terminal 100, and the terminal 100 receives the selected PCSCF 330 received through the 305 Use Proxy response message. The registration process is retransmitted by transmitting a registration message, and then the call processing of the terminal 100 is performed through the selected PCSCF 330 (S640 and S650).

7B is an example of capacity values for each PCSCF previously stored in the rescanning server 300. As shown in FIG. 7B, the rescanning server 300 includes information that the capacity value of the PCSCF1 310 is 1, the capacity value of the PCSCF2 320 is 2, and the capacity value of the PCSCF3 330 is 4.

A method of selecting a capacitance value in the case of FIG. 7B will be described later in more detail with reference to FIG. 8.

8 is a flowchart used to explain a method of selecting one PCSCF using the capacity value of each PCSCF.

First, a total of the capacities of the one or more PCSCFs is calculated (S610). In this embodiment, 7 is calculated as the total value as 1 + 2 + 4.

After that, the range is calculated for each PCSCF (S620).

An example in which a range is calculated for each PCSCF is illustrated in FIG. 9A. As shown in FIG. 9A, the ranges are 0 to 0 for PCSCF1 310, 1 to 2 for PCSCF2 320, and 3 to 6 for PCSCF3 330. The range is estimated to be proportional to the capacity value of each PCSCF. That is, only one range of PCSCF1 having a capacity of 1 was calculated, while four ranges of 3 to 6 of PCSCF3 having a capacity of 4 were calculated.

Thereafter, after extracting a specific random value X (S630), a module operation is performed using the total sum calculated in the total calculation step to calculate a result value (S640).

That is, after calculating any random value X, the module is performed with the sum value 7 previously extracted. In this case, the result will be 0 to 6.

The PCSCF with the range to which the result comes from is selected as the selection PCSCF. That is, if the result value is 0, PCSCF1 will be the selected PCSCF, and if the result value is 4, PCSCF3 will be the selected PCSCF (S650).

On the other hand, even if there are two or more PCSCFs having the same capacity value can be calculated in the same way as above. 9B is an embodiment illustrating a range value when two or more PCSCFs having the same capacitance value are present.

Also in this case, the sum of the capacities of the PCSCFs is first calculated (S610). In this case, 9 is calculated as the total value as 1 + 2 + 2 + 4.

After that, the range is calculated for each PCSCF (S620).

An example in which a range is calculated for each PCSCF is illustrated in FIG. 9B. As shown in FIG. 9A, the range of PCSCF1 is 0 to 0, the value of the PCSCF2 is 1 to 2, the PCSCF3 is 3 to 4, and the PCSCF4 is 5 to 8.

Thereafter, after extracting a specific random value X (S630), a module operation is performed using the sum calculated in the total calculation step to calculate a result value (S640).

That is, after calculating any random value X, the module is performed with 9, which is the total value extracted previously. In this case, the result will be from 0 to 8.

The PCSCF with the range to which the result comes from is selected as the selection PCSCF. That is, if the result value is 0, PCSCF1 will be the selected PCSCF, and if the result value is 4, PCSCF3 will be the selected PCSCF (S650).

So far, the PCSCF registration system and the PCSCF registration method in the IMS network have been described.

7A to 9B, the method of selecting the PCSCF based on the capacity of each PCSCF has been described in the present embodiment, but this is merely an example for convenience of description. Therefore, any capacity may be used as long as it is a capability value that can be expressed numerically in the performance of the PCSCF.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

The PCSCF registration method and the system using the same in the IMS network according to the present invention, unlike the method performed in the existing terminal, is made in a component in the network called a search server (Redirect Server), the policy defined by the operator (by subscriber PCSCF distribution can be facilitated according to (or, by capacity), and also includes a process of confirming whether the UE supports redirection processing through a 305 User Proxy message. It is also compatible with existing terminals that do not support interworking, and can be applied directly to the current mobile communication system, and it is an invention that is applicable to the industry because it is not only sufficient business possibility but also practically clearly implemented. .

1 is a diagram illustrating a process of obtaining information of a PCSCF by a terminal;

2 is a diagram illustrating a process of obtaining information of a PCSCF by a terminal according to an embodiment of the present invention;

3 is a block diagram showing a rescan server according to an embodiment of the present invention;

4 is a diagram illustrating an embodiment of a header included in a registration message;

5 is a diagram illustrating a processing process when a terminal does not support a function for processing a response message according to an embodiment of the present invention;

6A and 6B are views for explaining a process of selecting a PCSCF using the header value according to an embodiment of the present invention; and

7A to 9B illustrate a process of selecting a PCSCF according to a capacity value of each PCSCF according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: terminal 200: DNS server

300: rescan server

Claims (13)

In a system that supports registration of an IMS (IP Multimedia Subsystem) of a terminal, Receives a registration message (REGISTER) from the terminal, includes a list of one or more PCSCF (Proxy CSCF), selects any one of the one or more PCSCF selected PCSCF response message including the information of the selected PCSCF Redirect server for transmitting to the terminal; And And a terminal which transmits a registration message to the rescanning server, and then re-registers by transmitting a registration message to the selected PCSCF included in the received response message. A registration message receiving module for receiving a registration message (REGISTER) from the terminal; A PCSCF selection module including a list of one or more PCSCFs and selecting one of the one or more PCSCFs; And Redirect server for registering PCSCF in the IMS network, characterized in that it comprises a response message transmission module for transmitting a response message including the information of the selected PCSCF to the terminal. The method of claim 2 The rescan server And a terminal capability determining module for determining whether the terminal supports a function for processing the response message. Redirect server for PCSCF registration in the IMS network, characterized in that for performing the response message transmission function, if the terminal supports the function. The method of claim 3, The terminal capability determination module Extracting a header value from the registration message (REGISTER) and comparing the extracted header value with a previously stored list value to determine whether the terminal supports a function for processing the response message; Redirect server for PCSCF registration in IMS network. The method of claim 2 The PCSCF selection module A header extraction module for extracting a header value from the registration message (REGISTER); Redirect server for PCSCF registration in the IMS network, characterized in that it comprises a PCSCF extraction module for extracting the selected PSCF by comparing the value of the header and the pre-stored list value. The method of claim 2 The PCSCF selection module Redirect server for PCSCF registration in the IMS network, characterized in that for selecting the selected PSCF based on the capacity value of the one or more PCSCFs. The method of claim 6 The PCSCF selection module A total calculation module for calculating a total of capacities of the one or more PCSCFs; A range calculation module for calculating a range corresponding to each capacity for each of the one or more PCSCFs; An operation performing module for extracting a specific random value X and calculating a result value by performing a module operation with the sum calculated in the sum calculation step; And a PCSCF determination module for selecting a PCSCF having a range to which the result value belongs as the selected PCSCF. A registration step of the terminal transmitting a registration message (REGISTER) to the rescanning server; A PCSCF selection step of the rescanning server selecting a selection PCSCF which is any one of one or more PCSCFs; A response message transmission step of transmitting a response message including information of the selected PCSCF to the terminal; And registering, by the terminal, a registration message to the selected PCSCF and attempting to re-register with the selected PCSCF. The method of claim 8 A terminal capability determining step of determining whether the terminal supports a function for processing the response message; If the terminal supports the function, PCSCF registration method in the IMS network, characterized in that for performing the response message transmission step and re-registration step. The method of claim 9 The terminal capability determination step Extracting a header value from the registration message (REGISTER) and comparing the extracted header value with a previously stored list value to determine whether the terminal supports a function for processing the response message; How to register PCSCF in IMS network. The method of claim 8 The PCSCF selection step A header extraction step of extracting a header value from the registration message (REGISTER); And a PCSCF extraction step of extracting a selected PSCF by comparing the extracted header value with a previously stored list value. The method of claim 8 The PCSCF selection step And selecting a selected PSCF based on a capacity value of the one or more PCSCFs. The method of claim 12, The PCSCF selection step A total calculation step of calculating a total of capacities of the one or more PCSCFs; A range calculating step of calculating a range corresponding to each capacity for each of the one or more PCSCFs; An operation performing step of extracting a specific random value X and calculating a result value by performing a module operation with the sum calculated in the sum calculation step; and And a PCSCF decision step of selecting a PCSCF having a range to which the result value belongs as the selected PCSCF.

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