KR101644632B1 - Proxy CSCF Registeration Method in IMS Network and system thereof - Google Patents

Abstract

The present invention relates to a method of registering a Proxy CSCF (hereinafter referred to as PCSCF) in an IMS network. More specifically, when there are a plurality of PCSCFs accessible to an IMS network in an IMS network, As shown in FIG.

The PCSCF registration system in the IMS network according to the present invention receives a registration message (REGISTER) from a terminal and includes one or more PCSCF lists, selects one of the one or more PCSCFs, And transmits a registration message to the selected PCSCF included in the received response message to transmit the registration message to the re-searching server. To the terminal.

IMS, Proxy CSCF, terminal, SIP

Description

[0001] The present invention relates to a method for registering a PCSCF in an IMS network,

The present invention relates to a method of registering a Proxy CSCF (hereinafter referred to as PCSCF) in an IMS network. More specifically, when there are a plurality of PCSCFs accessible to an IMS network in an IMS network, As shown in FIG.

In the IMS (IP Multimedia Subsystem), there is a CSCF (Call Session Control Function) for performing call processing. Call State Control Function (CSCF) is a function that takes charge of the part related to call and session processing. It has functions such as incoming call gateway, call control function, SPD (Serving Profile Database) An address handling function, and the like.

The function as a gateway for an incoming call is to operate as an entry point and to perform routing for an incoming call. It also performs service triggering on incoming calls, such as call screening and forwarding, and is responsible for communication with the HSS.

Call control functions are responsible for call setup and termination and state / event management, interactions with MRF for multi-party services, call event reporting for billing, and reception and processing of application level registration.

The SPD manages user profile information by communicating with the HSS of the home domain and performs a similar function to the VLR of the existing network that informs the home domain when the user first accesses the user profile information.

The CSCF can be divided into P-CSCF (Proxy), I-CSCF (Interrogating) and S-CSCF (Serving) according to its functions. A Proxy Call State Control Function (P-CSCF) is a point where a UE (UE) first contacts with the IMS through GPRS access. In other words, a terminal or user equipment (UE) is the first point of access to the IMS and exists in the same domain as the GGSN. In 3GPP, a terminal uses DHCP to find a PCSCF or a method of obtaining an address through a PDP context. Needless to say, the IMS is not only accessible only through GPRS access, but can also be accessed through any IP access of wired or wireless.

1 is a diagram illustrating a process in which a terminal acquires information of a PCSCF.

As shown in FIG. 1, the terminal includes a list of PCSCFs. First, the terminal 100 queries the domain server (DNS Server) 200 for information of the first PCSCF (P-CSCF # 1) (S410). If it is not possible to obtain the information through the inquiry (S420), the information of the next PCSCF is inquired to the domain server 200 and a response is received (S430, S440). When the information of the PCSCF is successfully received from the DNS server 200, the process of registering with the PCSCF 320 is performed (S450).

However, in the PCSCF registration procedure according to the conventional method described above, when the terminal is located in the terminal for selecting the PCSCF and the terminal can not obtain the list of the proxy CSCF (for example, the DHCP can not provide information of the PCSCF) , Or where the network operator wishes to define a PCSCF distribution policy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and system for providing a proxy list of a proxy CSCF when a terminal is located in a terminal for selecting a PCSCF, The present invention provides a method for preventing a situation where the PCSCF can not be registered in the PCSCF and providing a more efficient way to define the PCSCF distribution policy.

In order to achieve the above object, a PCSCF registration system in an IMS network according to the present invention is a system for supporting registration of an IMS (IP Multimedia Subsystem) of a terminal, the system comprising: A redirect server for selecting a selected PCSCF from the one or more PCSCFs and transmitting a response message including information of the selected PCSCF to the terminal; And a terminal for transmitting a registration message to the re-searching server, and for re-registering by transmitting a registration message again to the selected PCSCF included in the received response message.

Meanwhile, a redirect server for PCSCF registration in an IMS network according to the present invention includes: a registration message receiving module for receiving a registration message (REGISTER) from a terminal; A PCSCF selection module that includes one or more PCSCF lists and selects a selected PCSCF that is 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 MS.

And the re-search server further includes a terminal function determination module for determining whether the terminal supports a function of processing the response message, and when the terminal supports the function, . ≪ / RTI >

Also, the terminal function determination module extracts a header value from the REGISTER message, compares the extracted header value with a pre-stored list value, and determines whether the terminal supports a function of processing the response message Or not.

The PCSCF selection module may include a header extraction module for extracting a header value from the REGISTER message and a PCSCF extraction module for comparing the extracted header value with a pre-stored list value to extract a selected PCSCF Do.

And the PCSCF selection module selects the selected PCSCF based on the capacity value of the one or more PCSCFs.

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

If the number of PCSCFs belonging to the range is more than two, the PCSCF determination module may randomly select any one of the PCSCFs.

If there are PCSCFs having the same capacity, the total sum calculation module does not add up the sum of the PCSCFs, and the range estimation module preferably calculates the same range between PCSCFs having the same capacity.

Meanwhile, a PCSCF registration method in an MS network according to an embodiment of the present invention includes: a registration step of transmitting a registration message (REGISTER) to a re-search server; A PCSCF selecting step of the re-searching server selecting one of the one or more PCSCFs; A response message transmission step of transmitting a response message including information of the selected PCSCF to the MS; And a re-registration step in which the terminal transmits a registration message to the selected PCSCF to attempt re-registration with the selected PCSCF.

And a terminal function determination step of determining whether the terminal supports a function capable of processing the response message, wherein when the terminal supports the function, the response message transmission step and the re-registration step are performed .

In addition, the terminal function determination step may include extracting a header value from the REGISTER message, comparing the extracted header value with a pre-stored list value, and determining whether the terminal supports a function of processing the response message Or not.

The PCSCF selecting step may include a header extracting step of extracting a header value from the REGISTER message and a PCSCF extracting step of extracting a selected PCSCF by comparing the extracted header value with a pre-stored list value Do.

Also, the PCSCF selection step preferably selects the selected PCSCF based on the capacity value of the one or more PCSCFs.

And the PCSCF selection step calculates a sum of the capacity of the one or more PCSCFs; A range calculating step of calculating a range corresponding to each capacity of the one or more PCSCFs; Calculating a result value by performing a module operation on a total sum calculated in the total sum calculation step after extracting a specific random value X and a PCSCF having a range to which the result value belongs is selected by the selected PCSCF PCSCF determination step.

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

In particular, the PCSCF registration method proposed in the present patent is performed in a component in a network called a redirect server, unlike a method performed in an existing terminal, so that a policy defined by a provider (per subscriber or capacity) It is possible to facilitate the distribution of the PCSCFs. Also, it is compatible with existing terminals that do not support interworking with the search server, including checking whether the terminal supports the redirection processing through the 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 in which a terminal acquires information of a PCSCF according to an embodiment of the present invention.

2, a PCSCF (Proxy CSCF) distribution function can be used through a network configuration in which a redirect server 300 is provided. Here, the re-search server may be configured as a newly configured server only for 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, which the terminal knows, becomes the re-search server 300. [ The terminal first obtains the information of the re-search server 300 through a DNS query (S460, S470).

Then, the REGISTER message, which is an initial registered SIP message, is transmitted to the re-search server 300 using the obtained information (S480).

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

Thereafter, the re-search server 300 transmits a 305 Use Proxy response message including the information of the selected PCSCF to the AT 100 (S490).

The terminal 100 transmits a registration message to the selected PCSCF 320 received via the 305 Use Proxy response message and retries the registration process. After that, the terminal 100 processes the call through the selected PCSCF 320 (S495).

It is possible to make the terminal call processing distribution to the proxy CSCF in various forms by placing the proxy CSCF selection point in the re-search server, which is one of the constituent nodes of the network, instead of the terminal.

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

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

The terminal function determination module 304 extracts a header value from the REGISTER message and compares the extracted header value with a pre-stored list value to thereby enable the terminal to process the response message Or not.

The PCSCF selection module 303 includes a total sum calculation module 305 for calculating a sum of the capacity of one or more PCSCFs, a range estimation module 305 for calculating a range corresponding to each capacity of the one or more PCSCFs, An operation execution module 307 for extracting a specific random value X and then performing a module operation on the sum calculated in the sum calculation step to calculate a result value, and a PCSCF And the PCSCF determination module 308 selects the selected PCSCF as the selected PCSCF.

In order to perform the contents shown in FIG. 2, the terminal 100 must be able to process a response message (305 Use Proxy) received from the rediscovery server 300. That is, it should be able to receive the response message and redirect the registration message to the selected PCSCF included in the received response message.

However, in the UEs existing in the 3GPP IMS network, if a 305 Use Proxy message is received, there may be a terminal capable of processing a retransmission (Redirection) and a terminal not receiving the 305 Use Proxy message. Before selecting the PCSCF to be transmitted to the terminal 100 after receiving the registration message from the terminal 100, it is first determined whether the terminal 100 that has transmitted the registration message supports the redirection processing function through the 305 Use Proxy message Check.

The confirmation of the redirection processing function through the 305 Use Proxy message of the terminal 100 is made through the contents of the REGISTER message received from the terminal. The rediscovery server 300 manages the list of the names of the SIP message headers and the contents of the header to be used when confirming the redirection processing function of the terminal. Upon receipt of the REGISTER message, the process of extracting the value of the header defined in the list and comparing whether the corresponding value is included or not is performed on all the configured 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 corresponding 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. Or the list information on the name of the SIP message header and the contents of the header is used as information for identifying the terminal supporting the redirection processing function through the 305 Use Proxy message.

When it is determined that the terminal 100 supports the 305 Use Proxy message processing function using the above information, the terminal 100 re-registers it in the selected PCSCF according to the response message transmitted from the retransmission server 300 Processing is possible, and processing is performed as described above in 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 re-search server 300, which will be described later with reference to FIG. 3, Perform the direct registration process.

5 is a diagram illustrating a process in a case where a UE does not support a function of processing a response message according to an embodiment of the present invention.

First, the access node of the IMS network, which the terminal knows, becomes the re-search server 300. [ The terminal first obtains the information of the re-search server 300 through a DNS query (S510, S515).

Then, the REGISTER message, which is an initial registered SIP message, is transmitted to the re-search server 300 using the obtained information (S520).

At this time, if the re-searching server 300 determines that the terminal 100 does not support the retransmission processing function through the 305 Use Proxy message as a result of the judgment of the header of the registration message, The registration process is directly performed by the ICSCF 370 and the SCSCF 380 (S520, S525, S528). The re-search server 300 includes the re-search function for the present invention in the PCSCF and directly registers as the PCSCF.

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

As a method of selecting a so-called independent PCSCF (Dedicated Proxy CSCF), a specific PCSCF preset by a pattern of a Public User Identity of a subscriber transmitting a registration message is selected.

The re-search server 300 has a configuration in which PCSCF information for processing a corresponding terminal is mapped according to a pattern of a Public User Identity, as shown in FIG. 10, 10, 10: 5060 in the case of 011 as shown in FIG. 6, and 10, 10, 10, 20:5060 in the case of 010 as the selected PCSCF.

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

First, since the access node of the IMS network that the terminal knows is the rediscovering server 300, the terminal 100 first obtains the information of the rediscovery server 300 through a DNS query (S540, S545).

Then, the REGISTER message, which is an initial registered SIP message, is transmitted to the re-search server 300 using the obtained information (S550). At this time, the registration message includes (to: 0112345678@test.com).

The re-search server 300 extracts information corresponding to the information included in the registration message from the pre-stored PCSCF information for each pattern. 10, 10, 10: 5060 corresponding to 011 through the registration message to the selected PCSCF (S555).

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

The terminal 100 transmits a registration message to the selected PCSCF 310 received through the 305 Use Proxy response message and retries the registration process. After that, the terminal 100 processes the call through the selected PCSCF 310 (S570).

FIGS. 7A and 8B are diagrams for explaining 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 arbitrary PCSCF (Arbitrary Proxy CSCF) as a method of selecting PCSCF according to the capacity value. This arbitrary PCSF selection is performed when there is no matching pattern in the independent PCSCF selection described above.

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

Then, in step S620, the REGISTER message, which is an initial registered SIP message, is transmitted to the re-search server 300 using the obtained information.

The re-search server 300 extracts the selected PCSCF using capacity information of each PCSCF (S630).

Thereafter, the re-search server 300 transmits a 305 Use Proxy response message including the information of the selected PCSCF to the UE 100, and the UE 100 transmits the 305 Use Proxy response message to the selected PCSCF 330 The registration message is transmitted and the registration process is retried. Thereafter, the call processing of the terminal 100 is performed through the selected PCSCF 330 (S640, S650).

7B is an example of a capacity value per PCSCF previously stored in the re-discovery server 300. FIG. As shown in FIG. 7B, the rediscovery server 300 includes information that the capacity value of the PCSCF1 310 is 1, the capacity value of the PCSCF2 320 is 4, and the capacity value of the PCSCF3 330 is 4.

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

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

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

Then, a range is calculated for each PCSCF (S620).

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

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

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

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

On the other hand, when there are two or more PCSCFs having the same capacity value, the same method can be used. FIG. 9B shows an example of a range value when there are two or more PCSCFs having the same capacity value.

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

Then, a range is calculated for each PCSCF (S620).

An example where the range is calculated for each PCSCF is shown in FIG. 9B. As shown in FIG. 9A, PCSCF1 ranges from 0 to 0, PCSCF2 ranges from 1 to 2, PCSCF3 ranges from 3 to 4, and PCSCF4 ranges from 5 to 8.

Thereafter, a specific random value X is extracted (S630), and a module calculation is performed on the total sum calculated in the sum calculation step (S640).

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

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

The PCSCF registration system and the PCSCF registration method in the IMS network according to the preferred embodiment 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 explanation. Therefore, it is needless to say that any value can be used as long as it is a capacity value that can be expressed numerically in the performance of the PCSCF even if it is not a capacity.

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 PCSCF in the IMS network according to the present invention are implemented in a component in the network called a redirect server, unlike the method performed in the existing terminal, , And the PCSCF distribution according to the capacity), and it is also possible to check whether the terminal supports the redirection processing through the 305 User Proxy message, The present invention can be applied to the existing mobile communication system and can be applied to the present invention because it is possible to carry out the operation clearly and realistically and clearly. .

1 is a diagram illustrating a process in which a terminal obtains information of a PCSCF,

FIG. 2 illustrates a process of obtaining information of a PCSCF by a terminal according to an embodiment of the present invention; FIG.

3 is a block diagram illustrating a rediscovery server according to an embodiment of the present invention;

Figure 4 illustrates one embodiment of a header included in a registration message;

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

FIGS. 6A and 6B are diagrams for explaining a process of selecting a PCSCF using header values according to an embodiment of the present invention; and FIGS.

FIGS. 7A and 9B are diagrams for explaining a process of selecting a PCSCF according to a capacity value of each PCSCF according to an embodiment of the present invention.

Description of the Related Art [0002]

100: terminal 200: DNS server

300: rediscovery server

Claims (13)

delete delete A registration message receiving module for receiving a registration message (REGISTER) from the terminal; A PCSCF selection module that includes one or more PCSCF lists and selects a selected PCSCF that is one of the one or more PCSCFs; And And a response message transmission module for transmitting a response message including information of the selected PCSCF to the terminal, Further comprising a terminal function determination module for determining whether the terminal supports a function of processing the response message, Wherein the response message is transmitted when the MS supports the function. The redirect server for PCSCF registration in the IMS network. The method of claim 3, wherein The terminal function determination module Extracts a header value from the REGISTER message and compares the extracted header value with a previously stored list value to determine whether the terminal supports a function of processing the response message. Redirect server for PCSCF registration in IMS network. A registration message receiving module for receiving a registration message (REGISTER) from the terminal; A PCSCF selection module that includes one or more PCSCF lists and selects a selected PCSCF that is one of the one or more PCSCFs; And And a response message transmission module for transmitting a response message including information of the selected PCSCF to the terminal, The PCSCF selection module A header extraction module for extracting a header value from the registration message (REGISTER) And a PCSCF extraction module for extracting a selected PCSCF by comparing the extracted header value with a pre-stored list value. The rediscovering server for PCSCF registration in an IMS network. A registration message receiving module for receiving a registration message (REGISTER) from the terminal; A PCSCF selection module that includes one or more PCSCF lists and selects a selected PCSCF that is one of the one or more PCSCFs; And And a response message transmission module for transmitting a response message including information of the selected PCSCF to the terminal, The PCSCF selection module And selecting a selected PCSCF based on a capacity value of the one or more PCSCFs. The redirect server for PCSCF registration in an IMS network. The method of claim 6, wherein The PCSCF selection module A total sum calculating module for calculating a sum of the capacity of the one or more PCSCFs; A range calculating module for calculating a range corresponding to each of the one or more PCSCFs; An arithmetic execution module for extracting a specific random value X and then performing a module operation on the sum calculated by the sum calculation module and calculating a result value; And selecting a PCSCF having a range to which the result value belongs by the selected PCSCF. delete A PCSCF selection step in which, when the re-searching server receives a REGISTER message from the terminal, the re-searching server selects one of the one or more PCSCFs; And And a response message transmission step of transmitting a response message including information of the selected PCSCF to the MS, Further comprising a terminal function determination step of determining whether the terminal supports a function of processing the response message, Wherein the response message transmission step is performed when the MS supports the function. The method of claim 9, wherein The terminal capability determination step Extracts a header value from the REGISTER message and compares the extracted header value with a previously stored list value to determine whether the terminal supports a function of processing the response message. How to register PCSCF in IMS network. A PCSCF selection step in which, when the re-searching server receives a REGISTER message from the terminal, the re-searching server selects one of the one or more PCSCFs; And And a response message transmission step of transmitting a response message including information of the selected PCSCF to the MS, The PCSCF selection step A header extracting step of extracting a header value from the registration message (REGISTER) And extracting a selected PCSCF by comparing the extracted header value with a previously stored list value. A PCSCF selection step in which, when the re-searching server receives a REGISTER message from the terminal, the re-searching server selects one of the one or more PCSCFs; And And a response message transmission step of transmitting a response message including information of the selected PCSCF to the MS, The PCSCF selection step And selecting a selected PCSCF based on a capacity value of the one or more PCSCFs. The method of claim 12, wherein The PCSCF selection step A total sum calculating step of calculating a sum of the capacity of the one or more PCSCFs; A range calculating step of calculating a range corresponding to each capacity of the one or more PCSCFs; Performing a module operation on a total sum calculated in the total sum calculating step after extracting a specific random value X and calculating a result value; And selecting a PCSCF having a range to which the result value belongs by the selected PCSCF.

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