KR20090049229A - Apparatus and method for call setup in ip multimedia subsystem - Google Patents

Abstract

The present invention relates to an apparatus and method for performing resource allocation according to a call setup between a wired network and a wireless network in a fixed mobile convergence system in which a wired network and a wireless network are mixed. A terminal confirmation unit that checks the type of the called terminal by receiving a message and, when confirming that the called terminal is a wired terminal, performs a call setup process through a wired network, and confirms that the called terminal is a wireless terminal. In the Mobile Convergence-based IMS environment, including a control unit that performs the call setup process, the bearer resource is reserved before the call setup is completed and before the call setup is completed. It can be guaranteed explicitly.

IMS, call setup, call setup, fixed mobile convergency

Description

APPARATUS AND METHOD FOR CALL SETUP IN IP MULTIMEDIA SUBSYSTEM}

The present invention relates to a mobile communication system, and more particularly, to an apparatus and method for performing resource allocation according to call establishment between a wired network and a wireless network in a fixed mobile convergence system in which a wired network and a wireless network are mixed. will be.

With the rapid development of communication technology, it has reached the stage of providing a high-speed data service capable of providing multimedia services such as e-mail, still images, video, etc. to mobile terminals as well as general voice services.

The so-called 3rd generation (3G) mobile communication systems supporting both general voice service and packet service include synchronous CDMA 20001x systems and asynchronous Universal Mobile Telecommunication Systems (UMTS). The third generation mobile communication system as described above provides a multimedia service to a portable terminal through interworking with an IMS network and other networks.

The portable terminal capable of interworking with the IMS network and other networks uses a voice data service in a circuit switch network such as a UMTS (Universal Mobile Telecommunication System) (UMTS) and a Global System for Mobile (GSM). In a WLAN environment, a multi-mode portable terminal that can use VoIP services.

The IMS was introduced as a release 5 standard in the 3rd Generation Partnership Project (3GPP), which is a standard research organization of the 3rd generation mobile communication system.

In other words, the IMS is a network for effectively supporting the demand for wireless data and multimedia services in the mobile communication network while supporting the existing voice service as it is. The IMS network uses a Session Initiation Protocol (SIP) for transmitting control signals and messages between the network components.

FIG. 1 is a diagram illustrating an interworking structure of a general wired / wireless IP multimedia subsystem (IMS) network.

Referring to FIG. 1, the IMS network interworking structure is a policy server for generating an SSS and S-CSCF in a IMS network, a P-CSCF in a contact point with a subscriber, and creating a policy decision and transmitting it to an IP edge. It can be configured to include IP edge managing resources based on policy decision.

First, when the S-CSCF receives the first INVITE message, the S-CSCF functions to transmit the message to the S-CSCF or the corresponding Serving System in which the called subscriber exists. The home subscriber server (HSS) stores subscriber information, and downloads subscriber information to the S-CSCF when registering a subscriber.

The P-CSCF (Proxy CSCF) provides a function of allocating and granting bearer resources and QoS management through interworking with a policy server. The P-CSCF delivers the bearer resource request received from the terminal through the INVITE request and the bearer network information of the other party to the policy server, so that the policy server can appropriately allocate the bearer resource and apply the required QoS.

The policy server provides a function for supporting allocation and granting of bearer resources and QoS management between the P-CSCF and the IP edge.

The IP edge refers to a position where actual IP communication starts in all wired / wireless networks. By assigning bearer resources under the control of the policy server, the path is set up so that the bearer can pass.

IMS terminal exists in each network and is a subject that generates mutual communication. Currently, an operation for using an IMS service in a wired network and an operation for using an IMS service in a wireless network are separately defined. In a wired network, when an IMS terminal transmits an Invite, the IMS terminal receives a 180 Ringing and 200 Ok message from a called terminal and exchanges bearers with each other. However, in a wireless network, the IMS terminal primarily transmits INVITE to provide resources for a bearer. And reserves the resource for the reserved resource through the second INVITE transmission.

FIG. 2 is a diagram illustrating a call connection process of a general wired / wireless IP multimedia subsystem (IMS) network.

2 (a) is a diagram illustrating a call setup process between wired terminals in the wired / wireless IP multimedia subsystem.

Referring to FIG. 2 (a), the call setup process between the wired terminals 200 and 201 does not need to be performed separately from the resource reservation and authorization process as in a wireless network. Call)

In other words, when the calling terminal 200 requests (INVITE) 210 to the called terminal 201, the called terminal 201 receives 108 ringing 212 and 200 OK in response to the request. 214 is transmitted to the calling terminal 200. After receiving the response, the calling terminal 200 transmits a response message 216 to the called terminal 201 and then performs a real-time transmission protocol connection 218.

2 (b) is a diagram illustrating a call setup process between wireless terminals in the wired / wireless IP multimedia subsystem.

Referring to FIG. 2B, when the calling terminal 220 requests 224 the call setup (INVITE) to the called terminal 222, the called terminal 222 receives 200 in response to the request. An OK 226 is sent to the calling terminal 220. After receiving the response, the calling terminal 220 transmits a response message 228 to the called terminal 222, and then sends a re-INVITE message 230 to the called terminal 222, thereby reserving resources. And carry out the permitting process.

Thereafter, the calling terminal 220 and the called terminal 222 exchange response messages with each other (232, 234, 236), and then perform a real-time transmission protocol connection (238).

FIG. 3 is a diagram illustrating a problem of a call connection process in a general IP / IP network.

3 (a) is a diagram illustrating a problem that occurs when a call is set up from a wired terminal to a wireless terminal.

Referring to FIG. 3 (a), after requesting call setup (INVITE) 310 from the calling terminal 301 to the called terminal 303, the calling terminal 301 is expected to receive 180 ringing. Receives a 312 Ok response 312. Accordingly, the calling terminal terminates the call setup process itself by recognizing an error on the FSM according to the 180 ringing loss 314 or simply ignores the failure of receiving the 180 ring response and performs normal processing on the 200 Ok response.

When the originating terminal 301 performs the normal processing on the 200 Ok response, the originating terminal 301 transmits the response to the called terminal 303 (316), and thus becomes a state capable of transmitting an RTP packet. However, since the called terminal 303 is not in a state of receiving an RTP packet, a problem occurs that the RTP packet of the originating terminal 301 is discarded 320 in the middle of the network.

In addition, after receiving the response message, the called terminal 303 is expected to receive a re-Invite message (318) and thus remains in a standby state without performing any further operation.

As a result, the called terminal 301 and the calling terminal 303 exist in a waiting state, and call setup failure occurs due to the expiration of the timer.

3 (b) is a diagram illustrating a problem that occurs when a call is set up from a wireless terminal to a wired terminal.

Referring to FIG. 3B, after the call terminal 311 requests the call setup 320 from the calling terminal 313, the calling terminal 311 expects to receive 200 OK. Wait for the message to be received (322).

However, the originating terminal 311 recognizes an error on the FSM according to the reception 324 of the 180 ringing response from the called terminal 313 and terminates the call setup process itself or simply ignores the 180 ringing. Normal response is performed on the response 326.

In the wired network communication, since the RTP transmission is possible after the transmission of the response message (Ack) (328), the receiving terminal 313 receiving the response is in a state capable of transmitting the RTP, so that it first transmits the RTP or Wait until the RTP is received from the calling terminal 311.

When the called terminal 313 transmits an RTP to the calling terminal 311, the calling terminal will stop 330 transmission because the bearer resource is not secured.

Also, the calling terminal 311 expects to receive 180 ringing after transmitting 332 the re-Invite to the called terminal 313 (334). However, the called terminal 313 may receive the initial Invite. Since 180 ringing is transmitted as a response, a 200 Ok response is transmitted to the calling terminal 311 (336).

Accordingly, the originating terminal 311 recognizes the error on the FSM and terminates the call setup process or processes the 200 Ok and transmits an Ack 338 so as to transfer the RTP between the two ends 340 to each other. .

The present invention was derived to solve the above problems, and an object of the present invention is to provide a call setup apparatus and method that can be commonly used in wired and wireless networks in the wired / wireless IP multimedia subsystem system.

Another object of the present invention is to provide an apparatus and method for checking the type of a called terminal through a response message to a call establishment request in a wired / wireless IP multimedia subsystem.

It is still another object of the present invention to provide an apparatus and method for confirming a type of a calling terminal by checking a call setup request message in a wired / wireless IP multimedia subsystem.

According to a first aspect of the present invention for achieving the above objects, a calling terminal for performing a call setup process includes a terminal confirmation unit for receiving a response message according to a call setup request and confirming a type of a called terminal, and the called terminal. If it is confirmed that the wired terminal, and performs a call setup process over the wired network, and if it is confirmed that the destination terminal is a wireless terminal, characterized in that it comprises a control unit for processing to perform the call setup process over the wireless network.

According to a second aspect of the present invention for achieving the above objects, a called terminal performing a call setup process analyzes an INVITE request including information indicating the type of calling terminal, A terminal checking unit for checking a type, and when confirming that the calling terminal is a wireless terminal, performs a call setting process through a wireless network, and when confirming that the calling terminal is a wired terminal, performing a call setting process through a wired network. And a called terminal for processing.

According to a third aspect of the present invention for achieving the above objects, a call setup method of a calling terminal receives a response message according to a call setup request to confirm the type of a called terminal, and that the called terminal is a wired terminal. When confirming, a process of performing a call setup process through a wired network, and when confirming that the called terminal is a wireless terminal, characterized in that it comprises a process of performing a call setup process through a wireless network.

According to a fourth aspect of the present invention for achieving the above objects, a call setup method of a called terminal includes the steps of: receiving a call request (INVITE request) including information indicating the type of calling terminal; A process of checking a type of the calling terminal by analyzing a setting request, a process of performing a call setting process through a wireless network when confirming that the calling terminal is a wireless terminal, and a wired terminal when confirming that the calling terminal is a wired terminal, And performing a call setup process through the network.

As described above, the present invention corresponds to the type of the terminal by checking the call setup request of the calling terminal to confirm the type of the calling terminal or the response message to the call setting request to confirm the type of the called terminal. By performing the call setup process, unnecessary call setup process can be omitted. In other words, the present invention can explicitly guarantee that the bearer resource is reserved before the call setup is completed and before the call is started (before the call setup is completed) when establishing a wired / wireless network call in a mobile convergence based IMS environment. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the following description, a call setup apparatus and method that can be commonly used in a wired / wireless network in a wired / wireless IP multimedia subsystem system will be described.

4 is a block diagram illustrating a configuration of a portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the portable terminal may include a control unit 400, a terminal identification unit 402, a memory unit 404, an input unit 406, a display unit 408, and a communication unit 410. .

First, the controller 400 of the portable terminal controls the overall operation of the portable terminal. The controller 400 may be described in a state of the portable terminal, that is, when the calling terminal and the receiving terminal.

First, when the portable terminal operates as an outgoing terminal, when the control unit 400 receives a response message for an INVITE request from the called terminal, the terminal checking unit 402 causes the incoming call to be received. Process to determine the type of terminal.

Thereafter, the controller 400 processes to perform a call setup process according to the type of the called terminal. In other words, the controller 400 performs a call setup process according to a wired network when confirming that the called terminal is a wired terminal and performs a call setup process according to a wireless network when confirming that the called terminal is a wireless terminal. .

In another embodiment, when the portable terminal operates as a called terminal, the control unit 400 processes the terminal checking unit 402 to check the type of the calling terminal when receiving a call setup request from the calling terminal. do.

The terminal checking unit 402 checks the type of the calling terminal or the called terminal by the instruction of the controller 400. Here, the terminal checking unit 402 may check the type of the called terminal by checking the response message for the call establishment request. In other words, when the terminal checking unit 402 receives a response message of "200 OK" from the called terminal, determines that the called terminal is a wireless terminal, and receives a response message of "180 Ringing". It can be determined that the called terminal is a wired terminal.

In addition, the terminal identification unit 402 operating in the called portable terminal can confirm the type of the calling terminal by checking the call setup request message received from the calling terminal. In other words, the calling terminal transmits the call setting request message to the called terminal including information indicating the type of the calling terminal.

The memory unit 404 includes a read only memory (ROM), a random access memory (RAM), and a flash ROM. The ROM stores a microcode and various reference data of a program for processing and controlling the control unit 400 and the terminal identification unit 402.

The RAM is a working memory of the controller 400, and stores temporary data generated while executing various programs. In addition, the flash ROM stores various updatable storage data such as a phone book, an outgoing message, and an incoming message.

The input unit 406 is a numeric key buttons of 0 to 9, a menu button (menu), a cancel button (clear), an OK button, a call button (TALK), an end button (END), an internet access button, a navigation key ( Or arrow keys) buttons are provided with a plurality of function keys to provide the control unit 400 with key input data corresponding to a key pressed by the user.

The display unit 408 displays state information, a limited number of characters, moving images and still images, etc. generated during the operation of the portable terminal under the control of the controller 400, and the display unit 408 displays a color liquid crystal display. A device (LCD: Liquid Crystal Display) can be used.

The communication unit 410 transmits and receives a radio signal of data input and output through an antenna. For example, in the case of transmission, after performing channel coding and spreading on the data to be transmitted, RF processing is performed to transmit the data. In the case of reception, the received RF signal is converted into a baseband signal. The baseband signal is de-spreaded and channel decoded to restore data.

The role of the terminal identification unit 402 may be performed by the control unit 400 of the portable terminal, but is shown separately configured in the present invention is an exemplary configuration for convenience of description and never the scope of the invention It is not intended to be limiting and those skilled in the art will recognize that various modifications are possible within the scope of the invention. For example, the controller 400 may be configured to process all of them.

In the following description, a call setup device that can be commonly used in a wired / wireless IP multimedia subsystem in a wired / wireless IP multimedia subsystem has been described, and in the following description, a wired / wireless IP multimedia subsystem in accordance with a preferred embodiment of the present invention. In the following, the call setup method commonly used in wired and wireless networks will be described.

5 is a flowchart illustrating a call setup process of a calling terminal according to the present invention.

Referring to FIG. 5, the calling terminal first requests an incoming request from the called portable terminal at step 501 (INVITE request), and then proceeds to step 503 to receive a response message for the request from the called terminal.

In step 505, the calling terminal reads the response message. In step 507, the calling terminal checks the type of the called terminal. Here, the calling terminal may check the type of the called terminal by checking a response message suitable for the characteristic of the called terminal. For example, when the portable terminal receives the response message "200 Ok", the called terminal that has transmitted the message may be determined to be a wireless terminal, and when receiving the response message "180 Ringing", the caller The terminal may determine that the called terminal transmitting the message is a wired terminal.

In step 509, the calling terminal checks whether the type of the called terminal identified in step 507 is a wireless terminal.

If it is determined that the called terminal is a wireless terminal, the calling terminal proceeds to step 511 and performs a call setup process performed by the wireless terminal. On the other hand, if it is determined that the called terminal is a wired terminal, the calling terminal proceeds to step 513 to perform a call setup process performed by the wired terminal.

Thereafter, the calling terminal terminates the present algorithm.

6 is a flowchart illustrating a call setup process of a called terminal according to the present invention.

In the following description, the calling terminal transmits the information indicating the type of the calling terminal to the called terminal by including in the invite request message.

Referring to FIG. 6, the called terminal first receives an INVITE request from the calling terminal in step 601, and then proceeds to step 603 to analyze the invite request message received from the calling terminal. The invite request message includes information indicating the type of the calling terminal as mentioned above.

In step 605, the called terminal checks the type of the calling terminal by analyzing the invite message, and then proceeds to step 607 to determine whether the calling terminal is a wireless terminal according to the checking process of step 605. .

If it is determined that the calling terminal is a wireless terminal, the called terminal proceeds to step 609 to perform a call setup process performed by the wireless terminal. On the other hand, if it is determined that the calling terminal is a wired terminal, the called terminal proceeds to step 611 to perform a call setup process performed by the wired terminal.

Thereafter, the called terminal terminates the present algorithm.

7 is a diagram illustrating a call setup attempt process of a wired terminal according to an embodiment of the present invention.

First, FIG. 7A illustrates a situation in which a wired terminal attempts to set up a call to a wireless terminal.

Referring to FIG. 7A, it is assumed that the originating terminal 701 attempting to set up the call is a wired terminal, and the called terminal 703 performing a call connection with the originating terminal 701 is a wireless terminal. do.

First, the wired terminal, which is the calling terminal 701, performs a call setup request (INVITE Request) to the called terminal 703 (710). The receiving terminal 703 receiving the call establishment request transmits a response message to the request to the calling terminal 701 (712). Here, the called terminal 703 will transmit a response message "200 OK" to the calling terminal 701 as it is a wireless terminal.

The originating terminal 701 receiving the response message of the called terminal 703 may determine (714) that the called terminal 703 is a wireless terminal through a form of the response message, that is, a "200 OK" response message. Can be. Thereafter, the calling terminal 701 transmits a response message to the called terminal 703 and prepares 718 for a real time communication protocol.

Thereafter, the caller terminal 701 performs a call setup process performed by the wireless terminal for call setup of the called terminal 703 which is a wireless terminal.

That is, the originating terminal 701 re-invite 720 transmission of an invite message, which is a call setup process of the wireless terminal, and the called terminal 703 receiving the invite message is the originating terminal. In step 701, a 180 ringing message 722 and a 200 OK are transmitted as a response message to the invite message, so that the call connection between the originating terminal 701 and the called terminal 703 is notified. .

Thereafter, the calling terminal 701 and the called terminal 703 perform a real time transmission protocol connection 730.

7 (b) is a diagram illustrating a situation in which a wired terminal attempts to set up a call to another wired terminal.

Referring to FIG. 7B, it will be described on the assumption that the calling terminal 741 attempting to set up the call and the called terminal 743 performing a call connection with the calling terminal 741 are wired terminals.

First, the wired terminal, which is the calling terminal 741, performs a call setup request (INVITE) to the called terminal 743 (745). The called terminal 743 receiving the call establishment request transmits a response message 747 to the calling terminal 741 in response to the request. Here, the called terminal 743 will transmit (751) the response message "180 Ringing" and the response message "200 Ok" to the calling terminal 741 as it is a wired terminal.

The originating terminal 741 receives (747) a response message of the called terminal 743, that is, the response message "180 Ringing", and determines (749) that the called terminal 743 is a wired terminal. Can be.

Thereafter, the calling terminal 741 transmits a response message 753 to the called terminal 743 and prepares a real time communication protocol 755.

Thereafter, the calling terminal 741 and the called terminal 743 perform a real-time transmission protocol connection (757).

FIG. 7C is a diagram illustrating a process of processing a situation in which a response message for a call setup request is lost when a wired terminal attempts to set up a call to another wired terminal.

Referring to FIG. 7C, when the call establishment request (INVITE) is performed from the calling terminal 761 to the called terminal 763 (765), the called terminal 763, which is a wired terminal, is the calling terminal. It sends a response of "108 Ringing" to 761. Here, 108 ringing, which is a response to the call establishment request, is an important factor for determining the type of the called terminal 763, that is, whether the called terminal is a wireless terminal or a wired terminal.

If the caller terminal does not receive a "180 Ringing" response due to an error or delay in the communication network or receives a delay later than the "200 Ok" response (767), the caller terminal 761 is a wired terminal. The terminal is recognized as a wireless terminal.

When the originating terminal 761 does not receive the "108 Ringing" as described above, the originating terminal 761 receives 769 of the "200 OK", and then performs 777 its own ring back. In this case, when the called terminal 763 is a wired terminal, the calling terminal 761 attempts a voice call after establishing a call with the called terminal 763, and the calling terminal 761 includes a real-time voice data. If you receive a transport protocol, you must release ringing and proceed with the voice call.

Thereafter, the calling terminal 761 transmits a "re-INVITE request" to the called terminal 763 (777), and ignores the "180 Ringing" response transmitted by the called terminal 763. In other words, when "180Ringing" is transmitted to the initial call setup request, the calling terminal 761 determines that the called terminal 763 is a wired terminal and performs ringing.

8 is a diagram illustrating a call setup attempt process of a wireless terminal according to an embodiment of the present invention.

First, FIG. 8A is a diagram illustrating a situation in which a wireless terminal attempts to set up a call to a wired terminal.

Referring to FIG. 8A, it is assumed that the originating terminal 801 attempting to set up the call is a wireless terminal, and the called terminal 803 performing a call connection with the originating terminal 801 is a wired terminal. The called terminal 803 will be described on the assumption that it is a terminal capable of performing a wired / wireless call setup process.

First, the wireless terminal which is the calling terminal 801 performs a call setup request (INVITE) to the called terminal 803 (805). Upon receiving the call establishment request, the called terminal 803 transmits a response message to the calling terminal 801. Here, the call setup request of the caller terminal 801, that is, the invite request message requesting the call setup, includes information indicating the type of the caller terminal.

The called terminal 803 receiving the call establishment request may check 807 the calling terminal 801 included in the invite message and determine that the calling terminal 801 is a wireless terminal.

The called terminal 803 determining that the calling terminal 801 is a wireless terminal sends a response message according to the call setting request, that is, "200 OK" to perform the same call setting operation as the wireless terminal. In step 809, the originating terminal 801 transmits a response to the response message to the called terminal 803.

As the transmission and reception of the response message as described above, the called terminal 803 completes the preparation for the real-time transmission protocol setting (813).

Thereafter, the originating terminal 801 retransmits an invite message to the called terminal 803 (815), and the called terminal 803 that receives the invite message responds with the message "180 Ringing". A message 817 and a "200 OK" message are transmitted 819, and the calling terminal 801 completes the preparation of the real-time transmission protocol by sending 819 a response message to the called terminal 803. (823)

Thereafter, the calling terminal 801 and the called terminal 803 perform the real-time transmission protocol setting (835).

FIG. 8 (b) is a diagram illustrating a process in which a wireless terminal attempts to set up a call to a wired terminal by using a call setup method between wired terminals as another embodiment of FIG. 8 (a).

Referring to FIG. 8 (b), it is assumed that the calling terminal 831 attempting to set up the call is a wireless terminal, and the called terminal 833 performing a call connection with the calling terminal 831 is a wired terminal. The called terminal 833 will be described on the assumption that the called terminal 833 is a terminal capable of performing a wired / wireless call setup process.

First, the wireless terminal which is the calling terminal 831 performs a call setup request (INVITE) to the called terminal 833 (835). The receiving terminal 833 receiving the call establishment request transmits a response message to the calling terminal 831 to the request. Here, the call setup request of the caller terminal 831, that is, the invite request message requesting the call setup, includes information indicating the type of the caller terminal 831.

Upon receiving the call setup request, the called terminal 833 may check information on the calling terminal 831 included in the invite message and determine that the calling terminal 831 is a wireless terminal.

The called terminal 833, which determines that the calling terminal 831 is a wireless terminal, transmits 839 " 180 Ringing " responses in the same manner as a call setup process between wired terminals. In this case, the called terminal 833 may perform a ringback that the user of the terminal may recognize after re-INVITE the incoming message from the calling terminal 831 (851).

The originating terminal 831 receiving the "180 Ringing" response determines that the called terminal 833 is a wired terminal and determines that it will not receive "180 Ringing" in response to the "re-INVITE request". As a result, a ringback is performed 841.

Thereafter, the called terminal 833 transmits a response message 843 of "200 OK" from the calling terminal 831, and receives 845 a response to the reply message from the calling terminal 831. The preparation for real-time transmission protocol setting is completed (847).

Thereafter, the called terminal 833 receives 849 the "re-INVITE request" from the calling terminal 831, and then performs a ringback 851, and sends the "re-" to the calling terminal 831. In response to "INVITE request", "85 OK" is transmitted (853).

Thereafter, the calling terminal 831 completes 857 preparing the real-time transmission protocol by transmitting 855 a response to the “200 OK” to the called terminal 833.

Thereafter, the calling terminal 831 and the called terminal 833 perform the real-time transmission protocol setting (859).

FIG. 8 (c) is a diagram illustrating a process in which a wireless terminal attempts to set up a call to a wired terminal by using a call setup method between wired terminals as another embodiment of FIG. 8 (a).

Referring to FIG. 8C, it is assumed that the originating terminal 861 attempting to set up the call is a wireless terminal, and the called terminal 863 performing a call connection with the originating terminal 861 is a wired terminal. The called terminal 863 will be described assuming that the terminal can not perform the wired and wireless call setup process.

First, the wireless terminal, which is the calling terminal 861, performs an INVITE request to the called terminal 863 (865). The receiving terminal 863 receiving the call establishment request transmits a response message to the calling terminal 861. Here, the call setup request of the caller terminal 861, that is, the invite request message requesting the call setup, includes information indicating the type of the caller terminal 861.

Since the called terminal 863 receiving the call setup request is a terminal that cannot perform a wired / wireless call setup process, the called terminal 861 is included in the "INVITE request" transmitted by the calling terminal 861. Information cannot be verified (867). Accordingly, the called terminal 863 transmits (869) “180 Ringing” to the calling terminal 861 to perform a call setup process between wired terminals.

The originating terminal 861 receiving the " 180 Ringing " recognizes that the called terminal 863 is a wired terminal and performs its own ringback in anticipation that the " 180 Ringing " Perform 871.

Thereafter, the calling terminal 861 and the called terminal 863 exchange (873, 879) response messages with each other to complete the preparation of the real time transmission protocol setting of the called terminal 863 (881).

Thereafter, when the calling terminal 861 transmits the message “re-INVITE” to the called terminal 861 (883), the calling terminal 861 and the called terminal 863 exchange a response message with each other (885). , (887). Accordingly, the calling terminal 861 completes preparation of the real time transmission protocol setting (889).

Thereafter, the calling terminal 861 and the called terminal 863 perform 891 the real-time transmission protocol setting.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram illustrating an interworking structure of a general wired / wireless IP multimedia subsystem (IMS) network;

2 (a) is a diagram illustrating a call setup process between wired terminals in the wired / wireless IP multimedia subsystem;

2 (b) is a diagram illustrating a call setup process between wireless terminals in the wired / wireless IP multimedia subsystem;

3 (a) is a diagram illustrating a problem occurring when a call is set up from a wired terminal to a wireless terminal;

3 (b) is a diagram illustrating a problem occurring when a call is set up from a wireless terminal to a wired terminal;

4 is a block diagram showing the configuration of a portable terminal according to an embodiment of the present invention;

5 is a flowchart illustrating a call setup process of a calling terminal according to the present invention;

6 is a flowchart illustrating a call setup process of a called terminal according to the present invention;

7 (a) is a diagram illustrating a situation in which a wired terminal attempts to set up a call to a wireless terminal according to an embodiment of the present invention;

7 (b) is a view showing a situation in which a wired terminal attempts to set up a call to another wired terminal according to an embodiment of the present invention;

7 (c) is a diagram illustrating a process of processing a situation in which a response message for a call setup request is lost when a wired terminal attempts to set up a call to another wired terminal according to an exemplary embodiment of the present invention;

8 (a) is a diagram illustrating a situation in which a wireless terminal attempts to set up a call to a wired terminal according to an embodiment of the present invention;

8 (b) is a diagram illustrating a process of attempting to set up a call to a wired terminal by a wireless terminal using a call setup method between wired terminals according to another exemplary embodiment of the present invention;

8 (c) is a diagram illustrating a process in which a wireless terminal attempts to set up a call to a wired terminal using a call setup method between wired terminals according to another exemplary embodiment of the present invention.

Claims (19)

In the calling terminal performing a call setup process, A terminal checking unit which checks the type of the called terminal by receiving a response message according to the call establishment request; If it is determined that the called terminal is a wired terminal, performing a call setup process through a wired network, and if it is confirmed that the called terminal is a wireless terminal, characterized in that it comprises a control unit for processing to perform a call setup process through a wireless network Outgoing terminal. The method of claim 1, The terminal identification unit, When the response message of 180 Ringing is received, the called terminal is determined to be a wired terminal, when receiving a 200 OK response message, the calling terminal characterized in that the called terminal is determined as a wireless terminal. The method of claim 2, The control unit, If it is determined that the called terminal is a wireless terminal, the incoming message is re-invoked to the called terminal (Re-INVITE), and after receiving a response message for the process of performing the incoming message again, the incoming call is received. Calling terminal, characterized in that for performing a call setup process through the wireless network by connecting to a real-time transmission protocol with the terminal. The method of claim 2, The control unit, If it is determined that the called terminal is a wired terminal, transmitting a response message for the call setup request response message to the called terminal so as to connect to a real-time transmission protocol to perform a call setup process through the wired network. Calling terminal, characterized in that. The method of claim 2, The control unit, In response to the call establishment request, the mobile station performs a ring back operation by receiving "200 OK" from the called terminal, and when receiving a real-time transmission protocol including voice data from the called terminal, release ringing and And the sender terminal is configured to retransmit an invite message to a called terminal. In a called terminal performing a call setup process, A terminal checking unit for analyzing a call setup request including information indicating a type of a calling terminal and confirming the type of the calling terminal; If it is determined that the calling terminal is a wireless terminal, performing a call setup process through a wireless network, and if it is confirmed that the calling terminal is a wired terminal, characterized in that it comprises a called terminal for processing to perform a call setup process through a wired network How to. The method of claim 6, The control unit, If it is determined that the calling terminal is a wireless terminal, a call setup process is performed through the wireless network by transmitting a response message for causing the calling terminal to re-invite the transmission of an invite message. Incoming terminal. The method of claim 6, The control unit, If it is determined that the calling terminal is a wireless terminal, the called terminal, characterized in that for performing the call setup process through the wireless network by transmitting a response message for performing the call setup process through the wired network. The method of claim 6. The control unit, If the information on the originating terminal included in the call establishment request transmitted by the originating terminal cannot be confirmed, a response message for performing a call establishment process through the wired network is transmitted to perform the call establishment process of the called terminal. Incoming terminal, characterized in that. In the call setup method of the calling terminal, Receiving a response message according to the call establishment request and checking the type of the called terminal; When the called terminal is a wired terminal, performing a call setup process through a wired network; And confirming that the called terminal is a wireless terminal, performing a call setup process through a wireless network. The method of claim 10, The process of checking the type of the called terminal, The method further includes determining that the called terminal is a wired terminal when receiving a 180 ringing response message, and determining that the called terminal is a wireless terminal when receiving a 200 OK response message. Way. The method of claim 10, The call setup process through the wireless network, If it is determined that the called terminal is a wireless terminal, re-INVITE of an invite message transmission to the called terminal; And receiving a response message for reproducing the invite message transmission, and then performing a real-time transmission protocol connection with the called terminal. The method of claim 10, Call setup process through the wired network, If it is determined that the called terminal is a wired terminal, transmitting a response message to the call setup request response message to the called terminal to perform a real-time transmission protocol connection. The method of claim 10, Call setting method of the calling terminal, And a call setup process for operating a response message in response to the call setup request. The method of claim 14, Call setting process of operating the response message in response to the call setup request, If it is determined that the response message for the call establishment request is lost, receiving a “200 OK” from the called terminal, and then performing a ring back operation; When receiving a real-time transmission protocol including voice data from the called terminal, releasing ringing and proceeding with a voice call; And retransmitting a re-INVITE request to the called terminal. In the call setup method of the called terminal, Receiving an INVITE request including information indicating a type of a calling terminal; Analyzing the received call establishment request and checking a type of the calling terminal; If it is determined that the calling terminal is a wireless terminal, performing a call setup process through a wireless network; If it is determined that the calling terminal is a wired terminal, the method comprising the step of performing a call setup process through a wired network. The method of claim 16, The call setup process through the wireless network, If it is determined that the calling terminal is a wireless terminal, transmitting a 200 OK response message for causing the calling terminal to re-invite an invite message; And when receiving the invite message from the originating terminal, transmitting 180 ringing as a response message to the received message. The method of claim 16, The call setup process through the wireless network, If it is determined that the calling terminal is a wireless terminal, transmitting a "180 Ringing" response message for performing a call setup process through the wired network; Performing a ringback after re-INVITE from the originating terminal and transmitting a "200 OK" which is a response message to the invite message. The method of claim 16. Call setting method of the called terminal, Transmitting a "180 Ringing" response to the calling terminal in order to perform a call setting process through the wired network if the information of the calling terminal included in the call establishment request transmitted by the calling terminal cannot be confirmed; And receiving the invite message from the originating terminal.

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