KR100917927B1 - Call forwarding method for processing mobile number portability for originating call of ip network and mobile communication system for the same - Google Patents

Abstract

A receiving call conversion method and a mobile communication system performing the same capable of switching the receiving call in a mobile communications system are provided to transmit an announcement about a receiving call conversion in IP network. If a transmitting terminal(200) is not able to respond to a transmitting call from an SIP terminal, a transmitting number about the receiving call is acquired. The called number transforming number is notified to the SIP terminal. The routing information corresponding to the called number transforming number is obtained. By using the routing information, the call is connected to the change over terminal and the SIP end-to-end corresponding to the called number transforming number.

Description

Call forwarding method for processing mobile number portability for originating call of IP network and mobile communication system for the same}

The present invention relates to an incoming call switching method in a mobile communication network. More specifically, the present invention relates to a method for converting an incoming call from an IP-based wired communication network (hereinafter referred to as an "IP network") network and a mobile communication system performing the same.

In general, call forwarding refers to a service that connects an incoming call to another number within a designated same subscription area. That is, the incoming call forwarding function performs a function of switching the incoming call to a number previously registered by the incoming call forwarding subscriber when any subscriber sends a call to the incoming call forwarding subscriber. A guide broadcast informing the call forwarding function is transmitted.

Meanwhile, circuit-based video call service is provided in WCDMA (Wideband Code Division Multiple Access, WCDMA) network, which is a mobile communication network, and video call service with heterogeneous IP network is also possible.

However, the conventional call forwarding function is performed only between mobile communication networks in the same mobile network or heterogeneous networks, and IP call processing in a mobile communication network such as a WCDMA network is not provided for outgoing calls in the IP network. There is a problem that the incoming call can not be transferred to the incoming call.

Accordingly, an object of the present invention is to provide an incoming call switching method that enables incoming call switching between heterogeneous networks by providing incoming call switching processing in a mobile communication network for an outgoing call from an IP network, and a mobile communication system performing the same.

In order to achieve the above object, an incoming call switching method according to an aspect of the present invention is an incoming call switching method in a mobile communication network for an outgoing call from a SIP terminal of an IP network, the method comprising: a) originating from the SIP terminal; Obtaining a called party number to which the call is transferred to the outgoing call when the called terminal to which the call is being called cannot answer; b) notifying the SIP terminal of the called number to be transferred; c) obtaining routing information corresponding to the called party number to be transferred; And d) using the routing information to connect a call for a call between the switching terminal corresponding to the called number to be transferred and the SIP terminal.

Mobile communication system according to another aspect of the present invention,

A mobile communication system for performing an incoming call conversion in a mobile communication network for an outgoing call from a SIP terminal of an IP network, comprising: a signal conversion gateway for performing call processing between the IP network and the mobile communication network that are heterogeneous; An originating exchange switch providing a mobile communication service for a terminal belonging to the mobile communication network and performing an interworking function between the IP network and the mobile communication network connected through the signal conversion gateway; A home location register for storing information about a subscriber subscribed to the mobile communication network and storing a called number to be transferred to a subscriber of a called terminal; And a first destination side exchange requesting rerouting of the incoming call to the originating exchange when the called terminal cannot respond to the incoming call from the originating exchange. 1 When resetting of the incoming call is requested from the called party exchange, the called terminal to be transferred to the called terminal is obtained from the home location register, and the switching terminal corresponding to the called number to be transferred is connected with the SIP terminal. do.

According to the present invention, it is possible to switch the incoming call in the mobile communication network to the outgoing call in the IP network.

In addition, when the incoming call is switched in the mobile communication network, the call announcement related announcement may be sent to the calling terminal of the IP network.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In addition, when a part is said to "include" a certain component, it means that it may further include other components, except to exclude other components unless otherwise stated.

In the present specification, a called terminal may include a called terminal (Mobile Station, MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user device ( It may refer to a user equipment (UE), an access terminal (AT), or the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

1 is a diagram schematically illustrating a mobile communication system for performing incoming call switching for an outgoing call in an IP network according to an embodiment of the present invention.

As shown in FIG. 1, a mobile communication system according to an embodiment of the present invention includes a signal conversion gateway 400, an originating exchange 500, an HLR 600, a first destination exchange 700, and a second destination exchange. 800.

Here, the SIP (Session Initial Protocol) terminal 100 belongs to the IP network 10 and transmits a call, and the called terminal 200 belongs to the mobile communication network 20 while the SIP terminal 100 belongs to the call. A mobile terminal to be called, and the switching terminal 300 is a mobile terminal that belongs to the mobile communication network 20 and receives an incoming call to which the call to be received by the called terminal 200 is switched.

The signal conversion gateway 400 performs call processing between the heterogeneous IP network 10 and the mobile communication network 20. For example, the signal conversion gateway 400 converts an ISUP (ISDN User Part) format message of the mobile communication network 20 into a SIP format message of the IP network 10, or a SIP format of the IP network 10. Call processing between heterogeneous networks, such as converting the message of the message into an ISUP format message of the mobile communication network 20.

In particular, the signal conversion gateway 400 receives the announcement of the announcement of the incoming call conversion from the source exchange 500 of the mobile communication network 20, and transmits the announcement to the SIP terminal 100 in accordance with the announcement announcement. . At this time, the signal conversion gateway 400 transmits a message informing of the announcement of the announcement through a Session Description Protocol (SDP) message, and then converts the announcement into data in a Real-Time Transport Protocol (RTP) format and then the SIP terminal. Send to (100).

The originating exchange 500 provides a mobile communication service for terminals belonging to the mobile communication network 20 through a wireless base station (not shown), and the IP network 10 connected through the signal conversion gateway 400. And the interworking function between the mobile communication network 20.

In particular, the originating exchange 500, when the incoming terminal 200, which receives the outgoing call from the SIP terminal 100 of the IP network 10, fails to answer, the incoming call switching process the incoming call, the incoming call switching Whether or not to send the announcement information from the HLR (600) and transmits to the signal conversion gateway (400). Here, the situation in which the called terminal 200 does not respond to the incoming call is busy (Busy), when the terminal is powered off (Power Off), when the subscriber of the called terminal 200 does not answer the call (No Answer), when there is no connection with the called terminal 200 (No Response).

The home location register (hereinafter referred to as "HLR") 600 stores a service profile related to subscriber information for a terminal user subscribed to the mobile communication network 20. In the embodiment of the present invention, The subscriber stores the called number and the announcement of the switching terminal 300 to transfer the incoming call, and provides the corresponding information according to a request from the source exchange 500.

The first destination exchange 700 provides a mobile communication service for terminals belonging to the mobile communication network 20 through a wireless base station (not shown), and particularly, the incoming call from the originating exchange 500 is received. Performs a function of connecting to the terminal 200. At this time, when it is determined that the called terminal 200 is not in response, the call switching is performed by the calling exchange 500 by requesting a route resetting to the calling exchange 500.

The second called side exchange 800 provides a mobile communication service for terminals belonging to the mobile communication network 20 through a wireless base station (not shown), and particularly, the incoming call transferred from the calling side exchange 500. Receives and performs the function of connecting to the switching terminal (300).

Hereinafter, a method of switching an incoming call to an outgoing call in an IP network according to an embodiment of the present invention will be described with reference to FIG. 2.

As described above, the SIP terminal 100 of the IP network 10 is an originating terminal for requesting a video call call, and the called terminal 200 is a terminal in the mobile communication network 20 for receiving a call specified in the video call call. The switching terminal 300 is a terminal in the mobile communication network 20 that receives the switched call due to the situation in which the called terminal 200 does not respond.

First, the SIP terminal 100 of the IP network 00 transmits an INVITE message to the signal conversion gateway 400 to request a call to the called terminal 200 (S100).

The signal conversion gateway 400 converts the SIP protocol into an ISUP protocol and transmits an IAM, which is an initial address message corresponding to the INVITE message, to the originating exchange 500 (S110).

The originating exchange 500 transmits a LOR message, which is a location inquiry message, to the HLR 600 in order to inquire the location of the called terminal 200 that is requested to be received from the SIP terminal 100 (S120), and the HLR 600. In step S130, the destination terminal 200 transmits a PRN (Provide Roaming Number) message, which is a routing request message for requesting a routing path for the destination terminal 200, to the first destination side exchange 700 in which the location is registered.

Receiving the PRN message, the first destination exchange 700 transmits a PRN ACK message including routing information for the called terminal 200 to the HLR 600 (S140), and the HLR 600 responds to the location inquiry. The routing information for the called terminal 200 is included in the LOR ACK message, which is a message, and transmitted to the originating exchange 500 (S150).

The originating exchange 500 transmits an IAM, which is a call connection request message, to the first called side exchange 700 in order to make a call connection request to the called terminal 200 (S160).

Then, the first called side exchange 700 requests paging (PAGING) to the called terminal 200 (S170), and transmits an ACM, which is an address completion message, to the calling side exchange 500 (S180). Subsequently, the source exchange 500 transmits the ACM to the signal conversion gateway 400 (S190), and the signal conversion gateway 400 converts the ACM into a 180 RINGING message and transmits it to the SIP terminal 100 (S200). ).

Next, while the first destination exchange 700 is waiting for a response from the destination terminal 200 to PAGING in step S170, the destination terminal 200 is busy or powered off. It is determined whether a situation occurs in which the called terminal 200 does not answer, such as (Power Off), answering a call (No Answer) or no response (No response) at all (S210).

If it is determined that the called terminal 200 does not respond (S210), the first called side exchange 700 sends a Redirection Request (RR) message, which is a redirection request message, to provide a later service. Transmit to 500 (S220).

Receiving the RR message, the calling side exchange 500 recognizes that the called terminal 200 is unable to respond, and transmits a Transfer To Number Request (TTNR) message, which is a called number request message, to the HLR 600 for incoming call transfer. Transmit (S230).

Next, the HLR 600 checks whether the subscriber of the called terminal 200 is subscribed to the call transfer service, and if the subscriber is subscribed to the call transfer service, the call is stored in the HLR 600 for the called subscriber. After receiving the called number and the announcement to be transferred, it is included in the TTNR Ack message, which is a response message of the TTNR message, and transmitted to the calling exchange 500 (S240). Here, whether to send the announcement stored for each called subscriber in the HLR 600 may be specified by the corresponding subscriber or fixedly set according to the policy of the mobile communication network 20.

Next, the source exchange 500 transmits a call progress message (CPG) to the signal conversion gateway 400 to inform the transfer of the incoming call. At this time, the called party to be transferred from the HLR 600 receives the final called number. In addition, whether to send the announcement with the inclusion in the CPG and transmits (S250). Here, the final called number is a number corresponding to the switch terminal 300.

On the other hand, the signal conversion gateway 400 operates differently depending on whether or not to send the announcement included in the CPG received from the source exchange 500. That is, if it is indicated in the CPG whether the announcement announcement is not sent announcement, the signal conversion gateway 400 converts the CPG message into a 183 SESSION PROGRESS message, including the final called number and transmits to the SIP terminal 100 (S260). However, if it is indicated in the CPG whether the announcement is sent as announcement, the signal conversion gateway 400 converts the CPG message into a 183 SESSION PROGRESS message and then includes the final called number, and at the same time, SDP for sending announcement message. The message is sent to the SIP terminal 100 together (S270).

Next, when a media session is opened between the SIP terminal 100 receiving the SDP message, the signal conversion gateway 400 converts the announcement image into data in the RTP format and transmits it to the SIP terminal 100 (S280).

As such, the HLR 600 transmits information on whether or not to send the announcement, and the signaling conversion gateway 400 receives and processes the announcement to send the announcement through the calling exchange 500, thereby processing the announcement for the incoming call transfer process. It may be sent to the SIP terminal 100.

Next, the source exchange 500 transmits an RR Ack message, which is a response message to the RR message, to the first called side exchange 700 (S290), and releases it to release the connection with the first called side exchange 700. After transmitting the REL (Release) message, which is a message, to the first called side exchange 700 (S300), the RLC (Release Complete) message, which is a response message, is received to terminate the signal connection with the first called side exchange 700. (S310).

Thereafter, the source exchange 500 transmits a LOR message, which is a location inquiry message, to the HLR 600 to inquire the location of the call transfer number received from the HLR 600, that is, the location of the switching terminal 300 ( In operation S320, the HLR 600 transmits a PRN message requesting a routing path for the switching terminal 300 to the second called side exchange 800 in which the switching terminal 300 is registered.

The second destination exchange 800 receiving the PRN message transmits a PRN ACK message including routing information about the switching terminal 300 to the HLR 600 (S340), and the HLR 600 responds to the location inquiry. The routing information for the switching terminal 300 is included in the LOR ACK message, which is a message, and transmitted to the originating exchange 500 (S350).

The originating exchange 500 transmits the IAM to the second called side exchange 800 in order to make a call connection request to the switching terminal 300 (S360).

Then, the second called side exchange 800 requests paging (PAGING) to the switching terminal 300 (S370), and transmits the ACM to the calling side exchange 500 (S380). Thereafter, when the second called side exchange 800 receives a response to paging from the switching terminal 300 (S390), it transmits ANM, which is a response message, to the calling side exchange 500 (S400), and then the calling side exchange ( 500 again transmits it to the signal conversion gateway 400 (S410).

Thereafter, the signal conversion gateway 400 converts the ANM into a 200 OK message and transmits it to the SIP terminal 100 (S420), and the SIP terminal 100 transmits an ACK message that is a response message to the 200 OK message. When the signal conversion gateway 400 transmits the data back to the originating exchange 500 (S440), the incoming call is transferred to the SIP terminal 100 and the called terminal 200 (S430). Call connection for the video call is completed between the switching terminal 300 receiving the.

Thereafter, the signal conversion gateway 400 starts the H.245 negotiation with the switching terminal 300 for the video call (S450), and when the negotiation ends, the switching terminal 300 and the signal conversion gateway 400 for the video call. A video call is opened between the SIP terminal 100 and the switching terminal 300 to start a video call (S460).

As such, for the call originating from the SIP terminal 100 of the IP network 10, the call exchanger 500 and the HLR 500 cooperate with each other in the mobile communication network 20 to transmit a called number and announcement. By providing whether to the signal conversion gateway 400, it is possible to switch the incoming call to the outgoing call of the IP network in the mobile communication network (20).

On the other hand, in the above described only for the incoming call transfer for the video call call from the SIP terminal 100 of the IP network 10, referring to the above description that it can be applied to voice calls easily those skilled in the art I will understand.

In addition, referring to Figure 2, the source exchange 500 is a message requesting the called number to be transferred to the HLR 600 after receiving the RR message that is the rerouting request message from the first destination exchange 700 Receive the called number to be transferred from the HLR 600 by sending a TTNR message (S230, S240), and then perform a location query for the called number (S320, S330, S340, S350) routing of the switching terminal 300 Although described as obtaining information, after the HLR 600 receives the TTNR message from the source exchange 500 in the above process, routing information on the called number to be transferred to the source exchange 500 is transmitted to the PRN message. And a TTNR Ack message, which is obtained from the second destination exchange 800 in advance through the PRN Ack message and is transmitted together when the TTNR Ack message, which is a response message to the TTNR message, is transmitted to the source exchange 500, then the source exchange 500 To HLR (600) It is a process of requesting to view the location of the called number can not be converted in structure can be simplified.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram schematically illustrating a mobile communication system for performing incoming call switching for an outgoing call in an IP network according to an embodiment of the present invention.

2 is a flowchart illustrating an incoming call switching method for an outgoing call in an IP network according to an embodiment of the present invention.

Claims (14)

In the call transfer method in the mobile communication network for the outgoing call from the SIP (Session Initial Protocol) terminal of the IP network, a) obtaining a called party number to which the call is transferred to the outgoing call if the called terminal to which the incoming call from the SIP terminal cannot answer; b) notifying the SIP terminal of the called number to be transferred; c) obtaining routing information corresponding to the called party number to be transferred; And d) connecting a call for a call between the switching terminal corresponding to the called number to be transferred and the SIP terminal using the routing information; Call forwarding method comprising a. The method of claim 1, When acquiring a called number to be transferred to the called call in step a), acquiring whether or not to send a announcement that the call to the called terminal is called. Sending the announcement to the SIP terminal in step b) depending on whether or not to send the announcement; Incoming call transfer method, characterized in that. The method of claim 2, Step a) is i) receiving, by the signal conversion gateway of the mobile communication network, a call connection request message of a SIP protocol from the SIP terminal; ii) the signal conversion gateway transmitting a call connection request message of an ISUP protocol corresponding to a call connection request message of the SIP protocol to an originating exchange of the mobile communication network; iii) the originating exchange transmitting a call connection request message to the first called exchange using the routing information obtained by querying the location of the called terminal to the home location register of the mobile communication network; iv) transmitting a rerouting request message from the first called exchange to the calling exchange due to a situation in which the called terminal cannot respond; And v) the originating exchange obtaining the called number to which the call is transferred from the home location register; Call forwarding method comprising a. The method of claim 3, B), Transmitting, by the calling exchange, whether the call forwarding number and the announcement are to be transferred to the signal conversion gateway through a call progress message (CPG); Checking, by the signal conversion gateway, whether or not the announcement is sent out; Transmitting, by the signal conversion gateway, a called number to be transferred to the SIP terminal when the announcement is not indicated as whether the announcement is sent or not; If it is indicated whether the announcement is sent or not, the signal conversion gateway transmits a message for transmitting the announcement with the called party number to the SIP terminal to the SIP terminal; And Transmitting, by the signal conversion gateway, the announcement to the SIP terminal Call forwarding method comprising a. The method of claim 4, wherein When the announcement is an image, the signal conversion gateway transmits a Session Description Protocol (SDP) message to the SIP terminal together with the called number to be transferred to transmit the announcement message. . The method of claim 5, And the signal conversion gateway converts the announcement image into data in a Real-Time Transport Protocol (RTP) format and transmits the received announcement image to the SIP terminal. The method of claim 3, In step v), Sending, by the calling side exchange, a called party number request message to the home location register; Checking, by the home location register, whether a subscriber of the called terminal subscribes to a call transfer service; When the subscriber of the called terminal is subscribed to the call forwarding service, the caller receives the called number and the announcement to be stored for the subscriber of the called terminal and sends the announcement as a response message of the called number request message. Transmitting to the side exchange Call forwarding method comprising a. The method of claim 7, wherein After step v), Sending, by the originating exchange, a response message to the rerouting request message to the first destination exchange; And The calling party terminating the signal connection with the first called side exchange; Call forwarding method comprising a. The method according to any one of claims 1 to 8, The situation that the called terminal can not respond, When the called terminal is busy (Busy), when the called terminal is powered off (Power Off), when the subscriber of the called terminal does not answer the phone (No Answer), when it is not connected to the called terminal ( No response), the call forwarding method, characterized in that any one of the situation. In the mobile communication system for performing the incoming call switching in the mobile communication network for the outgoing call from the SIP terminal of the IP network, A signal conversion gateway for performing call processing between the IP network and the mobile communication network that are heterogeneous; An originating exchange switch providing a mobile communication service for a terminal belonging to the mobile communication network and performing an interworking function between the IP network and the mobile communication network connected through the signal conversion gateway; A home location register for storing information about a subscriber subscribed to the mobile communication network and storing a called number to be transferred to a subscriber of a called terminal; And A first called side exchange requesting rerouting of an incoming call to the calling side exchange when the called terminal cannot answer the incoming call from the calling side exchange; Including; When the calling side exchange is required to reroute the incoming call from the first called side exchange, the originating exchange acquires a called number to be transferred to the called terminal from the home location register and corresponds to the called number to be transferred. A mobile communication system connecting a terminal and the SIP terminal. The method of claim 10, The home location register stores and stores whether or not the announcement sent out when the incoming call is switched to the subscriber of the called terminal, The calling side exchange also acquires whether the announcement is sent when the called party is to be transferred and transmits the announcement to the signal conversion gateway. Mobile communication system, characterized in that. The method of claim 11, And the signal conversion gateway transmits the announcement to the SIP terminal according to whether the announcement is transmitted from the originating exchange. The method of claim 12, And when the announcement is an image, the signal conversion gateway transmits a Session Description Protocol (SDP) message to the SIP terminal together with the called number to be transferred to send the announcement message. The method of claim 13, And the signal conversion gateway converts the announcement image into data in a Real-Time Transport Protocol (RTP) format and transmits it to the SIP terminal.

Images