KR102094206B1 - Vioce call service swiching system, gateway apparatus and service swiching apparatus and control method each of them - Google Patents

Abstract

The present invention relates to a technology which enables mVoIP transmission/reception in connection with an LTE cellular network through voice call service switching between mVoIP and VoLTE. According to the present invention, a voice call service switching system comprises: a gateway device configured to convert an application-based first voice call signal received from a first voice call service network into a second voice call signal based on an IP multimedia subsystem (IMS), deliver the second voice call signal to a second voice call service network, convert the second voice call signal received from the second voice call service network into a first voice call signal, and deliver the first voice call signal to the first voice call service network; and a service switching device configured to process the second voice call signal in the second voice call service network according to a predefined voice call service switching method or transmit the second voice call signal to the gateway device when it is determined that voice call service switching is possible based on the second voice signal received from the second voice signal service network.

Description

VOICE CALL SERVICE SWITCHING SYSTEM, GATEWAY APPARATUS AND SERVICE SWICHING APPARATUS AND CONTROL METHOD EACH OF THEM}

The present invention relates to a method of enabling mVoIP transmission / reception in connection with LTE Cellular Network through a voice call service switch between mVoIP and VoLTE.

VoIP technology refers to a technology that connects a call by transmitting voice as a data packet in a data network based on an IP address, and mVoIP technology refers to a VoIP-based voice call service using a wireless access network in a mobile device.

Because mVoIP or VoIP technology delivers voice over a data network, only voice calls between applications that allow each other using the protocols promised at the application level between the sending and receiving terminals are possible.

On the other hand, VoLTE technology is a technology that connects calls by transmitting voice data packets in LTE Cellular Network. It uses a Trusted 3GPP Access Network according to the 3GPP standard. Reliable voice call connection is possible using a bearer capable of guaranteeing QoS.

Because VoLTE technology conforms to the international standard 3GPP standard, it is easy to interwork with existing calls called all telephone networks covering both wired and wireless.

However, with mVoIP technology, it is possible for various Internet companies to send voice signals through the data network at very low cost, but the main reason why they cannot replace ordinary telephones is their compatibility.

For example, mVoIP is not compatible with voice calls based on a communication network provided by a mobile communication company, so it is impossible to speak to a wired / cordless phone through mVoIP.

Accordingly, the present invention is to propose a method to enable mVoIP transmission / reception in connection with LTE Cellular Network.

The present invention has been created in view of the above circumstances, and an object of the present invention is to enable mVoIP transmission / reception in connection with LTE Cellular Network through a voice call service switch between mVoIP and VoLTE.

Voice call service switching system according to an embodiment of the present invention for achieving the above object, the first voice call signal based on the application received from the first voice call service network IMS (IP Multimedia Subsystem) based second voice A gateway device that converts the call signal to a second voice call service network and transmits the second voice call signal received from the second voice call service network to the first voice call service network; And when it is determined that the voice call service can be switched based on the second voice call signal received from the second voice call service network, the second voice call signal is the second voice call service according to the predefined voice call service switching method. It characterized in that it comprises a service switching device to be processed in the network, or a second voice call signal is transmitted to the gateway device.

Specifically, when the gateway device converts the first voice call signal received from the first voice call service network into the second voice call signal, the service identification information is inserted into the second voice call signal to insert the service identification information. Accordingly, a second voice call signal may be transmitted to the service switching device.

Specifically, the service switching device, when the location registration status is confirmed in the second voice call service network of the called terminal for the outgoing request from the first voice call service network identified from the second voice call signal, or 2 When the location registration status in the first voice call service network of the called terminal is confirmed with respect to the call request confirmed from the voice call signal, it can be determined that the voice call service can be switched.

Specifically, the service switching device, when the outgoing request from the first voice call service network is confirmed from the second voice call signal, according to the predefined voice call service switching method, the service switching device is configured to remove the calling terminal in the second voice call signal. The subscriber virtual number in the first voice call service network can be converted to the subscriber number in the second voice call service network so that the converted second voice call signal is processed in the second voice call service network.

Specifically, when the incoming call request from the second voice call signal to the first voice call service network is confirmed, the service switching device inserts the service identification information into the second voice call signal, and performs the second according to the service identification information. A voice call signal can be transmitted to the gateway device.

The gateway device according to an embodiment of the present invention for achieving the above object receives an application-based first voice call signal from a first voice call service network, and an IMS (IP Multimedia Subsystem) from a second voice call service network. A receiving unit for receiving the second voice call signal; And converts the first voice call signal received from the first voice call service network into a second voice call signal and transmits it to the second voice call service network, and removes the second voice call signal received from the second voice call service network. Characterized in that it comprises a conversion unit for conversion to a first voice call signal and transmitted to the first voice call service network.

Specifically, when the conversion unit converts the first voice call signal received from the first voice call service network into a second voice call signal, the service identification information is inserted by inserting service identification information into the second voice call signal. Accordingly, the second voice call signal may be transmitted to the service switching device located in the second voice call service network for switching the voice call service.

Specifically, the service identification information includes a subscriber virtual number in the first voice call service network, access address information of the gateway device, header information of the second voice call signal, and CELL in the access network information (P-Access-Network). -It may include at least one of ID setting values.

Specifically, the conversion unit, the first voice call service network in connection with the location registration request from the first voice call service network, the outgoing request from the first voice call service network, and the incoming request from the second voice call service network In a case in which an incoming call is not possible, the first voice call signal associated with at least one of the corresponding call forwarding requests may be converted into a second voice call signal.

In order to achieve the above object, according to an embodiment of the present invention, the first voice call service network in which the application-based first voice call signal is processed and the second voice call signal based on the IMS (IP Multimedia Subsystem) are processed. A service switching apparatus for switching a voice call service between voice call service networks includes: a determination unit for determining whether voice call service switching is possible based on a second voice call signal received from a second voice call service network; And if it is determined that voice call service switching is possible, the second voice call signal is processed in the second voice call service network according to a predefined voice call service switching method, or the second voice call signal is first voice call. It characterized in that it comprises a switching unit to be delivered to the gateway device located in the first voice call service network to convert to a signal.

Specifically, the service switching device, when the location registration request in the first voice call service network is confirmed from the second voice call signal, and the location registration status in the first voice call service network for the terminal requesting the location registration The service status information matching the location registration status of the second voice call service network is updated and registered, and a registration unit for sharing the service status information with the location management device of the second voice call service network may be further included.

Specifically, the discrimination unit, when the location registration status in the second voice call service network of the called terminal is confirmed for the outgoing request from the first voice call service network identified from the second voice call signal, or the second voice When the location registration status in the first voice call service network of the called terminal is confirmed with respect to the call request confirmed from the call signal, it can be determined that the voice call service can be switched.

Specifically, when the outgoing request from the first voice call service network is confirmed from the second voice call signal, the switching unit removes the subscriber virtual number from the first voice call service network of the calling terminal in the second voice call signal. 2 The second voice call signal converted by switching to the subscriber number in the voice call service network can be processed in the second voice call service network.

Specifically, when the incoming request from the second voice call signal to the first voice call service network is confirmed, the switching unit inserts the service identification information into the second voice call signal, and accordingly the second voice call according to the service identification information. The signal can be transmitted to the gateway device.

Specifically, the switching unit, for the incoming call to the first voice call service network, the subscriber number in the second voice call service network of the calling terminal in the second voice call signal to the subscriber virtual number of the first voice call service network. You can switch.

Method of operation of a gateway device according to an embodiment of the present invention for achieving the above object, receives an application-based first voice call signal from the first voice call service network, IMS (IP) from the second voice call service network Multimedia Subsystem) receiving step of receiving a second voice call signal; And converts the first voice call signal received from the first voice call service network into a second voice call signal and transmits it to the second voice call service network, and removes the second voice call signal received from the second voice call service network. Characterized in that it comprises a conversion step of converting the first voice call signal and transmits it to the first voice call service network.

Specifically, in the converting step, when converting the first voice call signal received from the first voice call service network into the second voice call signal, the service identification information is inserted into the second voice call signal to insert the service identification information. Accordingly, the second voice call signal may be transmitted to the service switching device located in the second voice call service network for switching the voice call service.

In order to achieve the above object, according to an embodiment of the present invention, the first voice call service network in which the application-based first voice call signal is processed and the second voice call signal based on the IMS (IP Multimedia Subsystem) are processed. A method of operating a service switching apparatus for switching a voice call service between voice call service networks includes: a determining step of determining whether voice call service switching is possible based on a second voice call signal received from a second voice call service network; And if it is determined that voice call service switching is possible, the second voice call signal is processed in the second voice call service network according to a predefined voice call service switching method, or the second voice call signal is first voice call. It characterized in that it comprises a switching step to be delivered to the gateway device located in the first voice call service network to convert to a signal.

Specifically, in the determining step, when the location registration status in the second voice call service network of the called terminal is confirmed with respect to the outgoing request from the first voice call service network identified from the second voice call signal, or the second When the location registration status in the first voice call service network of the called terminal is confirmed with respect to the call request confirmed from the voice call signal, it can be determined that the voice call service can be switched.

Specifically, in the switching step, when the outgoing request from the first voice call service network is confirmed from the second voice call signal, the subscriber virtual number in the first voice call service network of the calling terminal in the second voice call signal is checked. By switching to the subscriber number in the second voice call service network, the converted second voice call signal can be processed in the second voice call service network.

Specifically, in the switching step, when an incoming request from the second voice call signal to the first voice call service network is confirmed, the service identification information is inserted into the second voice call signal to generate the second voice according to the service identification information. It is possible to cause a call signal to be delivered to the gateway device.

Accordingly, according to the voice call service switching system of the present invention, a gateway device and a service switching device, and an operation method of the device, mVoIP transmission / reception in connection with LTE Cellular Network is possible through voice call service switching between mVoIP and VoLTE, thereby allowing subscribers Receives the same service as VoLTE through mVoIP Application, and can use voice calls at a cheaper price. In particular, it is possible to make cheaper voice calls in overseas outbound roaming situations.

In addition, subscribers can use their existing numbers as they are when performing voice calls through mVoIP, providing higher convenience, and carriers can provide voice calls that are almost the same as VoLTE through mVoIP. It is possible to provide a service bypassed by mVoIP in the case of a total overload or failure, and various mVoIP operators can provide an API for voice service compatibility.

1 is a schematic configuration diagram of a voice call service switching system according to an embodiment of the present invention.
2 is a schematic configuration diagram for explaining a location registration processing process according to an embodiment of the present invention.
3 is a signal flow diagram in the location registration process according to an embodiment of the present invention.
4 is a schematic configuration diagram for explaining a process for processing an outgoing request according to an embodiment of the present invention.
5 is a signal flow diagram in the process of processing an outgoing request according to an embodiment of the present invention.
6 is a schematic configuration diagram for explaining a process for processing an incoming request according to an embodiment of the present invention.
7 is a signal flow diagram of an incoming call processing process according to an embodiment of the present invention.
8 is a signal flow diagram of a process for processing a call forwarding request according to an embodiment of the present invention.
9 is a schematic configuration diagram for explaining a gateway device according to an embodiment of the present invention.
10 is a schematic configuration diagram for explaining a service switching apparatus according to an embodiment of the present invention.
11 is a schematic flowchart for explaining a method of operating a gateway device according to an embodiment of the present invention.
12 is a schematic flowchart for explaining a method of operating a service switching device according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 shows a structure of a voice call service switching system according to an embodiment of the present invention.

As shown in Figure 1, the service switching system according to an embodiment of the present invention, the first voice call service network (S1) and mVoIP infrastructure that processes the application-based voice call signal, and cellular voice call service network in particular The second voice call service network (S2), which is a VoLTE infrastructure for processing IMS (IP Multimedia Subsystem) -based voice call signals, follows an interlocked environment through the gateway device 30.

The first voice call service network S1 may include a terminal 10 (hereinafter referred to as a 'first terminal') and a call processing server 20, and the second voice call service network S2 may include a call. A processing device 40 (CSCF), a service switching device (50; TAS, Telephony Application System) and a location management device (60; HSS), and a terminal 70 (hereinafter referred to as a 'second terminal') may be included.

The first terminal 10 refers to a mobile terminal in which the mVoIP application is installed, and can determine whether to use mVoIP or cellular voice call (3G / VoLTE) by determining network quality through the mVoIP application.

Here, the basis for determining the network quality may include, for example, signal strength (RSSI) of an access network, ping test and latency with a specific server, and geographic location.

The call processing server 20 communicates with the mVoIP application of the first terminal 10 to check the activation state of the terminal itself or the mVoIP application, and to the gateway device 30 according to the mVoIP outgoing signal from the first terminal 10 Send the voice call signal (hereinafter, the first voice call signal) or push the first voice call signal with the first terminal 10 as the called terminal so that the first terminal 10 receives the call. help.

In addition, the call processing server 20 stores the subscriber's information so that calls between mVoIPs are handled by themselves without interworking with the general telephone network, and other calls are transferred to the gateway device 30.

The gateway device 30 is interlocked with the call processing server 20 and replaces the terminal 10 and the call processing server 20 with the first voice call signal from the first voice call service network (S1). It plays a role of transmitting to the call processing server 20 a voice call signal (hereinafter referred to as a second voice call signal) received from the second voice call service network S2 or transmitted to the network S2.

To this end, the gateway device 30 provides, for example, an HTTP Jason based OPEN API to the call processing server 20 to support the transmission of the first voice call signal, and the SIP based transmission of the second voice call signal. You will use international standard protocols.

For reference, as the second voice call signal conforming to the SIP-based protocol is used in the gateway device 30, the second voice call service network S2 may operate as if it is a VoLTE terminal.

The call processing device 40 refers to a device for routing the second voice call signal based on the service identification information in the second voice call signal in the second voice call service network S2.

Here, the service identification information is information for distinguishing that the second voice call signal is a signal to be transmitted from or transmitted from the first terminal 10, for example, a subscriber virtual in the first voice call service network S1. At least one of a number (eg, mVoIP ID), access address information of the gateway device 30, header information of the second voice call signal, and CELL-ID setting values in the access network information (P-Access-Network) may be included. have.

The service switching device 50 classifies the voice call in the first voice call service network (S1) and the voice call in the second voice call service network (S2), and, if necessary, in the first voice call service network (S1). It can provide specialized services for voice calls.

In addition, the service switching device 50 updates and manages the location registration status in the first voice call service network S1 of the first terminal 10 and manages the location registration status of the first terminal 10. By sharing with the management device 60, the location management device 60 sends a call signal from the second voice call service network (S2) to the first terminal 10 as the called terminal to the first voice call service network (S1). Make it possible to know it should be delivered

In particular, when the subscriber virtual number in the first voice call service network (S1) is assigned to the first terminal 10, the service switching device 50 assigns the calling number of the first terminal 10 to the mobile phone number, that is, In the second voice call service network (S2), it is converted to a subscriber number. Conversely, for outgoing calls using the first terminal (10) as a destination terminal, the mobile phone number of the calling terminal is transferred to the first voice call service network (S1). It converts to the subscriber's virtual number in and induces an incoming call in the first voice call service network (S1).

The location management device 60, even if the location registration status in the second voice call service network (S2) of the first terminal 10 is not confirmed, if the location registration in the first voice call service network (S1) is confirmed Ramen, in response to the incoming network query from the call processing device 40 by IMS, induces an incoming call to the first voice call service network (S1).

As described above, the voice call service switching system according to an embodiment of the present invention provides a voice call service switching between the first voice call service network (S1) and the second voice call service network (S2) based on the configuration. 2 Transmission / reception of the first terminal 10 in connection with the voice call service network (S2) becomes possible.

On the other hand, related to this, there is a technology related to a repeater capable of providing a call between mVoIP and a general wired / wireless telephone.

However, in the conventional case, it is premised that the mVoIP user is not subscribed to the mobile communication company, and the user should be able to connect the relay device with their network and the user should be able to convert the ID to the general phone number. There is a disadvantage in that a new phone number, etc., that has not been used, must be acquired.

In addition, since it is impossible to use the various voice services (prohibition of call / prohibition of call / forward call) provided by existing carriers in the same way, it is the same situation as the user is using another wireless phone. Falls.

In particular, when performing outgoing / receiving by converting to a phone number mapped to mVoIP ID, how to handle the outgoing call by a mobile operator or a designated telecommunication company with the converted calling number when calling, or moving the mapped phone number when receiving Since the technology of a method for transmitting a relay device call by a communication company or a special communication service provider is not disclosed, the commerciality of the technology is poor.

On the other hand, in the case of a voice call service switching system according to an embodiment of the present invention, the limitations of the prior art are being solved based on the above-described configuration. Let's take a look at each type of voice call divided into calls.

First, referring to FIG. 2, a process for processing a location registration request in a voice call service switching system according to an embodiment of the present invention will be described.

The first terminal 10 notifies the call processing server 20 that the location registration is required through the predefined API-based first voice call signal (mVoIP Regi. Request API), and the call processing server 20 The location registration is passed to the gateway device 30 after the first authentication procedure to see if the request is suitable.

At this time, the call processing server 20, if the periodic location registration is not possible due to the application background operation of the first terminal 10 is impossible, the first voice call signal for location registration (HDV Telco Regi. API) It can be periodically raised to the gateway device 30.

When the gateway device 30 receives the first voice call signal (mVoIP Regi. Request API) from the call processing server 20, the first voice call signal (HDV Telco Regi. API) to perform the IMS authentication procedure Is converted into a second voice call signal (mVoIP SIP Regi) and transmitted to the second voice call service network (S2).

At this time, the gateway device 30 inserts service identification information so that the second voice call signal (mVoIP SIP Regi) delivered to the second voice call service network (S2) can be delivered to the service switching device 50, The call processing device 40 that receives the second voice call signal (mVoIP SIP Regi) from the second voice call service network (S2) converts the second voice call signal (mVoIP SIP Regi) into service according to the service identification information. (50).

Here, the service identification information includes, for example, a subscriber virtual number (eg, mVoIP ID) in the first voice call service network (S1), access address information of the gateway device 30, header information of the second voice call signal, and At least one of the CELL-ID setting values in the access network information (P-Access-Network) is included.

When the service registration device 50 confirms the location registration request in the first voice call service network S1 from the second voice call signal (mVoIP SIP Regi) received from the call processing device 40, the service conversion device 50 requests the location registration. The service status information matching the location registration status in the first voice call service network (S2) and the location registration status in the second voice call service network is updated and registered for the first terminal (10), and the service status information is removed. 2 By sharing with the location management device 60 of the voice call service network S2, a call is directed to the service switching device 50 when an incoming call to the first terminal 10 occurs in the future so that the voice call service network can be determined. do.

For reference, the procedure for registering the IMS location in the second voice call service network (S2) follows the same procedure defined in 3GPP TS23.228.

Meanwhile, the signal flow in the above-described IMS location registration request processing process is as shown in FIG. 3, and the description of the signal flow can be summarized as in [Table 1] below.

number Explanation 1-2 The first terminal 10 requests location registration to the gateway device 30 through the call processing server 20. 3-7 Initial Regi follows the same call flow as the HDV terminal, and since the call processing server 20 is responsible for storing authentication information, it sends 401 Unauthorized to the call processing server 20 to obtain additional authentication information. 8-14 The IP of the gateway device 30 is processed in the same way as a normal HDV terminal, and authentication is successfully processed. 15-16 The successful authentication processing result is sent to the first terminal (10).

Next, referring to FIG. 4, a process for processing a call request in a voice call service switching system according to an embodiment of the present invention will be described.

The first terminal 10 transmits an outgoing request through a predefined API-based first voice call signal (mVoIP Regi. Request API) to the call processing server 20.

The call processing server 20 receives the first voice call signal from the first terminal 10, and if the corresponding outgoing call is not received in another mVoIP call, that is, the first voice call service network S1, the gateway device 30 ) To transmit the first voice call signal (Telco Call origination API) for the outgoing request.

On the other hand, the call processing server 20 receives a first voice call signal for an outgoing request from the first terminal 10, and when an incoming call in mVoIP, i.e., the first voice call service network S1, is required, the call terminal Download Push Noti to enable mVoIP reception. However, the call processing server 20 can induce general cellular reception by sending an outgoing request to the gateway device 30 when it is determined that the receiving terminal is in an abnormal operation or cannot receive the call, and other various mVoIP transmissions are not possible. It is possible to control the outgoing signal for a reason, for example, to set a limit on the number of outgoing calls or to decide whether to allow it in a specific location (overseas roaming) situation.

When the first voice call signal (Telco Call origination API) for an outgoing request is received, the gateway device 30 converts it into a second voice call signal (SIP INVITE) and calls within the second voice call service network (S2). It is delivered to the processing device 40.

At this time, the gateway device 30 inserts service identification information so that the second voice call signal (SIP INVITE) delivered to the second voice call service network (S2) can be delivered to the service switching device 50. 2 The call processing device 40 receiving the second voice call signal (SIP INVITE) from the voice call service network (S2) converts the second voice call signal (SIP INVITE) into the service switching device 50 according to the service identification information. To pass.

When the service request device 50 confirms an outgoing request (mVoIP call) from the first voice call service network S1 from the service identification information in the second voice call signal (SIP INVITE), the service switching device 50 is configured to remove the first terminal 10. 1 The subscriber's virtual number in the voice call service network (S1) is converted to the subscriber's number in the second voice call service network (S2), and the converted second voice call signal is transmitted to the call processing device (40) to make an outgoing request. To be processed.

As described above, the conversion of the subscriber virtual number in the first voice call service network (S1) to the subscriber number in the second voice call service network (S2) is because callback cannot be made when the subscriber virtual number is exposed as it is. The reason for this is to convert the subscriber to the actual subscriber number that can be received and deliver it.

For reference, the service switching device 50 may generate a separate billing for the corresponding outgoing signal in this process or perform an outgoing voice service specialized for mVoIP.

Meanwhile, the signal flow in the above-described origination request processing process is as shown in FIG. 5, and the description of the signal flow can be summarized as in [Table 2] below.

number Explanation 1-2 The first terminal 10 sends an outgoing request to the gateway device 30 through the call processing server 20 3-4 The gateway device 30 converts the outgoing request to SIP INVITE and delivers it, and the call processing device 40 recognizes the gateway device 30 as a terminal and processes the second voice call signal (SIP INVITE). 5 The service switching device 50 changes the P-Asserted-Identity and From headers from the mVoIP virtual calling number to the number registered by the first terminal 10 in the mobile communication network to hide the mVoIP virtual calling number and receive the calling number. Can be displayed as 6 In case of CS call, it is routed to IMG / WIMG, and in case of other party call, it is routed to IBCF to receive the call. *) Same as the existing call handling 10-11 The gateway device 30 converts and transmits mVoIP Call reception notification notification API for 180/183. 13-18 When receiving 183 and early media needs to be performed, the call processing server 20 can raise the mVoIP Call reception notification confirmation API and proceed with the PRACK response. 22-23 The gateway device 30 transfers the 200V to the mVoIP Call Accept Notification API for delivery. *) For other error codes, the termination notification API is delivered to deliver the SIP error code and Reason.

Finally, with reference to FIG. 6, a process for processing an incoming call request in a voice call service switching system according to an embodiment of the present invention will be described.

The location management device 60 receives the second voice call signal (SIP INVITE) according to the call request to the first terminal 10, and according to a request for confirmation from the call processing device 40, the first terminal corresponding to the called terminal Apart from the location registration status in the second voice call service network (S2) of (10), it is based on the location registration status in the first voice call service network (S1) shared from the service switching device 50. Allow the incoming request to be routed to the service switching device (50).

When the second voice call signal (SIP INVITE) is routed and received from the call processing device 40, the service switching device 50 successfully registers the location of the first terminal 10 to the first voice call service network S1. After finally confirming that, the service identification information is inserted into the second voice call signal (SIP INVITE) so that the second voice call signal (SIP INVITE) can be transmitted to the first voice call service network (S1).

Here, the service identification information includes, for example, a subscriber virtual number (eg, mVoIP ID) in the first voice call service network (S1), access address information of the gateway device 30, header information of the second voice call signal, and At least one of the CELL-ID setting values in the access network information (P-Access-Network) is included.

At this time, the service switching device 50 may generate a separate billing for the incoming call in the process or perform an incoming voice service specialized for mVoIP.

The call processing device 40 positions the second voice call signal (SIP INVITE) in accordance with the service identification information in the second voice call signal (SIP INVITE) received from the service switching device 50 to the position of the first terminal 10 In the registration process, it is transferred to the bound access address information (IP), that is, the gateway device 30.

When the second voice call signal (SIP INVITE) is received from the second voice call service network (S2), the gateway device 30 converts it into a first voice call signal (Telco Call Incoming API), and the call processing server 20 To pass.

When the first voice call signal (Telco Call Incoming API) is received from the gateway device 30, the call processing server 20 confirms that the first terminal 10 is a policy-capable subscriber, and then delivers Push Noti to induce incoming calls. do.

The signal flow in the above-described incoming request processing process is as shown in FIG. 7, and the description of the signal flow can be summarized as in [Table 3] below.

number Explanation 1-3 When an incoming request for the first terminal 10 is received, the location management device 60 checks whether the first terminal 10 is in the mVoIP location registration status and routes the call to the IMS. 4-5 If the service switching device 50 confirms the mVoIP location registration status and the mVoIP incoming status is confirmed, the request URI and To are changed to the mVoIP virtual number to receive the incoming call. 6 In the call processing device 40, since the Regi Binding for the virtual number is the gateway device 30, the call is dropped to the gateway device 30. 7-8 The gateway device 30 delivers the incoming notification API corresponding to the INVITE call to the call processing server 20, and the call processing server 20 transmits the incoming Noti. To the first terminal 10. 10-15 While waiting for the response of the first terminal 10 to the push, the receiving notification API is transmitted to the gateway device 30 to send 180 to the calling terminal to generate a call connection tone. 16 When the first terminal 10 responds to the push, 200OK is transmitted through the accept API to connect the call. *) Responses to 603, 408, and 486 other than 200OK received responses are delivered through the termination API.

On the other hand, in the process of inducing an incoming call by delivering the Push Noti, the call processing server 20 intentionally delivers an error message when the first terminal 10 determines as a subscriber who cannot receive the call with mVoIP. This allows the service switching device 50 to receive calls by changing to VoLTE or 3G voice.

Here, the case of determining that the user cannot be called includes a case in which an attempt is made but there is no response for a certain period of time or more, and thus it is determined as a timeout, and policy is impossible.

The signal flow in the process of processing the incoming call request is shown in FIG. 8, and the description of the signal flow can be summarized as in [Table 4] below.

number Explanation 1-15 Same as incoming Call Flow. 17 When the call processing server 20 determines that the call should be received through the existing mobile communication network by detecting the timeout for the first terminal 10 and detecting the failure condition, the gateway device 30 by setting a timeout in Reason in the mVoIP Call termination API Delivered to. 19-20 The gateway device 30 creates a 408 Error for the timeout termination API and delivers it to the service switching device 50. 21-22 The service conversion device 50 converts to an HDV incoming call and generates and transmits INVITE. *) However, if the parent number is not in the HDV Regi state, it induces a 3G voice call, and the process is the same as the existing 3G voice call processing. .

The above description of the voice call service switching system according to an embodiment of the present invention is completed, and the description of the gateway device 30 will be continued.

9 shows a schematic configuration of a gateway device 30 according to an embodiment of the present invention.

As shown in FIG. 9, the gateway device 30 according to an embodiment of the present invention includes a receiver 31 for receiving a first voice call signal and a second voice call signal, and a first voice call signal and a second It may have a configuration including a conversion unit 32 for mutually converting the audio signal.

All or at least a part of the configuration of the gateway device 30 may be implemented in the form of a hardware module or a software module, or a combination of a hardware module and a software module.

Here, the software module may be understood as, for example, instructions executed by a processor that controls operations within the gateway device 30, and these instructions may have a form mounted on a memory in the gateway device 30.

On the other hand, the gateway device 30 according to an embodiment of the present invention, in addition to the above-described configuration, the call processing server 20 in the first voice call service network (S1) and the call processing in the second voice call service network (S2) It may have a configuration further comprising a communication unit 33, which is an RF module in charge of a practical communication function with the device 40.

Here, the communication unit 33 includes, for example, an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a codec (CODEC) chipset, and memory, but is not limited thereto. Any known circuit to be performed may be included.

After all, the gateway device 30 according to an embodiment of the present invention is configured to perform the first voice call signal in the first voice call service network (S1) and the second voice call service network (S2) through the above-described configuration. The two voice call signals can be converted to each other, and hereinafter, each configuration in the gateway device 20 for realizing this will be described in more detail.

The receiving unit 31 performs a function of receiving a voice call signal.

More specifically, the receiving unit 31 receives an application-based first voice call signal from the first voice call service network (S1), and a second voice call based on an IP Multimedia Subsystem (IMS) from the second voice call service network. You will receive a signal.

Here, the first voice call service network (S1), that is, the first voice call signal received from the call processing server 20, the location registration request of the first terminal 10, the transmission request of the first terminal 10, And a call forwarding request corresponding to a case in which the first terminal 10 is unable to receive an incoming call from the second voice call service network. Also, the second voice call service network (S2), that is, the call The second voice call signal received from the processing device 40 is associated with an incoming request to the first terminal 10.

The conversion unit 32 performs a function of converting a voice call signal.

More specifically, the conversion unit 32 converts the first voice call signal received from the first voice call service network S1 into a second voice call signal and transmits it to the second voice call service network S2. 2 The second voice call signal received from the voice call service network (S2) is converted into a first voice call signal and transmitted to the first voice call service network.

At this time, when the conversion unit 32 converts the first voice call signal received from the first voice call service network into the second voice call signal, the service identification information is inserted into the second voice call signal to identify the inserted service. According to the information, the second voice call signal can be transmitted to the service switching device 50 located in the second voice call service network to switch the voice call service.

Here, the service identification information includes, for example, a subscriber virtual number (eg, mVoIP ID) in the first voice call service network (S1), access address information of the gateway device 30, header information of the second voice call signal, and At least one of the CELL-ID setting values in the access network information (P-Access-Network) is included.

In this regard, when the second voice call signal is received from the gateway device 30, the call processing device 40 located in the second voice call service network (S2) is configured according to the service identification information in the second voice call signal. 2 The voice call signal can be transmitted to the service switching device 50.

The description of the gateway device 30 according to an embodiment of the present invention is completed, and the description of the service switching device 50 will be continued.

10 shows a schematic configuration of a service switching device 50 according to an embodiment of the present invention.

As shown in FIG. 10, the service switching device 50 according to an embodiment of the present invention is a discrimination unit 51 for determining whether or not voice call service switching is possible, and a switching unit 52 for switching a voice call service ).

In addition, the service switching device 50 according to an embodiment of the present invention may further include a registration unit 53 for updating and registering the location registration status in addition to the above-described configuration.

The entire or at least part of the configuration of the service switching device 50 may be implemented in the form of a hardware module or a software module, or a combination of a hardware module and a software module.

Here, the software module may be understood as, for example, instructions executed by a processor that controls operations within the service switching apparatus 50, and these instructions may have a form mounted in a memory in the service switching apparatus 50. have.

On the other hand, the service switching device 50 according to an embodiment of the present invention, in addition to the above-described configuration, a communication unit that is an RF module responsible for a practical communication function with the call processing device 40 in the second voice call service network S2 ( 54).

Here, the communication unit 54 includes, for example, an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a codec (CODEC) chipset, and memory, but is not limited thereto. Any known circuit to be performed may be included.

After all, the service switching apparatus 50 according to an embodiment of the present invention can switch the voice call service between the first voice call service network S1 and the second voice call service network S2 through the above-described configuration. , Hereinafter, each configuration in the service switching device 50 for realizing this will be described in more detail.

The determining unit 51 performs a function of determining whether or not voice call service switching is possible.

More specifically, the determination unit 51 is based on the second voice call signal received from the second voice call service network, that is, the second voice call signal received from the call processing device 40, the first voice call service network ( It is determined whether or not voice call service switching is possible between S1) and the second voice call service network S2.

At this time, the discrimination unit 51 responds to the outgoing request from the first voice call service network S1 identified from the second voice call signal, that is, the second voice call service network S2 of the second terminal 70. ) When the location registration status is confirmed, or the first voice call of the first terminal 10, that is, the receiving terminal for the incoming request to the first voice call service network S1 confirmed from the second voice call signal When the location registration status in the service network S1 is confirmed, it can be determined that the voice call service can be switched.

On the other hand, prior to determining whether such a voice call service switching is possible, the registration unit 53 updates and manages service status information for the first terminal 10 located in the first voice call service network S1.

That is, when the location registration request in the first voice call service network (S1) for the first terminal 10 is confirmed from the second voice call signal, the registration unit 53 is the first for the first terminal 10. The service status information that matches the location registration status in the voice call service network (S1) and the location registration status in the second voice call service network (S2) is updated and registered, and the service status information is registered in the second voice call service network ( S2) Share with my location management device (60).

The switching unit 52 performs a function of switching a voice call service.

More specifically, when it is determined that the switching of the voice call service is possible, the switching unit 52 causes the second voice call signal to be processed in the second voice call service network S2 according to a predefined voice call service switching method. Or, in order to convert the second voice call signal into a first voice call signal, it is transmitted to the gateway device 30 located in the first voice call service network S1.

At this time, the switching unit 52, when the outgoing request from the first voice call service network (S1) is confirmed from the second voice call signal, to the calling terminal in the second voice call signal, that is, the first terminal 10 The second voice call signal is processed in the second voice call service network (S2) by converting the subscriber virtual number in the first voice call service network (S1) to the subscriber number in the second voice call service network (S1). It is delivered to the processing device 40.

Here, switching the subscriber virtual number in the first voice call service network (S1) to the subscriber number in the second voice call service network (S2) is because the call back cannot be made when the subscriber virtual number is exposed as it is. The reason for this is to convert the subscriber to the actual subscriber number that can be received and deliver it.

On the other hand, when the incoming request from the second voice call signal to the first voice call service network is confirmed, the switching unit 52 inserts the service identification information into the second voice call signal, and the second voice according to the service identification information. The call signal is transmitted to the gateway device 30.

That is, the switching unit 52 transmits the second voice call signal into which the service identification information is inserted, to the call processing apparatus 40, and the call processing apparatus 40 that received the second identification signal according to the inserted service identification information The voice signal can be transmitted to the gateway device 30.

Here, the service identification information includes, for example, a subscriber virtual number (eg, mVoIP ID) in the first voice call service network (S1), access address information of the gateway device 30, header information of the second voice call signal, and At least one of the CELL-ID setting values in the access network information (P-Access-Network) is included.

On the other hand, the switching unit 52 in the second voice call service network (S2) of the calling terminal in the second voice call signal, that is, the second terminal 70 for the incoming request to the first voice call service network (S1) Needless to say, the subscriber number can be converted to the subscriber virtual number of the first voice call service network (S1).

As described above, according to the configuration of the voice call service switching system, the gateway device 30, and the service switching device 50 according to an embodiment of the present invention, LTE Cellular through voice call service switching between mVoIP and VoLTE By enabling mVoIP transmission / reception in connection with the network, subscribers can use the voice call at a lower price while receiving the same service as VoLTE through mVoIP Application.

In addition, subscribers can use their existing numbers as they are when performing voice calls through mVoIP, providing higher convenience, and carriers can provide voice calls that are almost the same as VoLTE through mVoIP. It is possible to provide a service bypassed by mVoIP in the case of a total overload or failure, and various mVoIP operators can provide an API for voice service compatibility.

Hereinafter, an operation method of the gateway device 30 according to an embodiment of the present invention will be described with reference to FIG. 11.

First, the receiver 31 receives an application-based first voice call signal from the first voice call service network S1, and receives an IMS (IP Multimedia Subsystem) -based second voice call signal from the second voice call service network. It is received (S11).

Here, the first voice call service network (S1), that is, the first voice call signal received from the call processing server 20, the location registration request of the first terminal 10, the transmission request of the first terminal 10, And a call forwarding request corresponding to a case in which the first terminal 10 is unable to receive an incoming call from the second voice call service network. Also, the second voice call service network (S2), that is, the call The second voice call signal received from the processing device 40 is associated with an incoming request to the first terminal 10.

Furthermore, the conversion unit 32 converts the first voice call signal received from the first voice call service network S1 into a second voice call signal and transmits it to the second voice call service network S2 (S12-S15). ).

At this time, when the conversion unit 32 converts the first voice call signal received from the first voice call service network into the second voice call signal, the service identification information is inserted into the second voice call signal to identify the inserted service. In accordance with the information, the second voice call signal can be transmitted to the service switching device 50 located in the second voice call service network to switch the voice call service (S12-S15).

Here, the service identification information includes, for example, a subscriber virtual number (eg, mVoIP ID) in the first voice call service network (S1), access address information of the gateway device 30, header information of the second voice call signal, and At least one of the CELL-ID setting values in the access network information (P-Access-Network) is included.

In this regard, when the second voice call signal is received from the gateway device 30, the call processing device 40 located in the second voice call service network (S2) is configured according to the service identification information in the second voice call signal. 2 The voice call signal can be transmitted to the service switching device 50.

In addition, the conversion unit 32 converts the second voice call signal received from the second voice call service network S2 into a first voice call signal and transmits it to the first voice call service network (S16-S17).

Here, the second voice call signal received from the second voice call service network S2 may be understood as an incoming request to the first voice call service network S1.

Hereinafter, an operation method of the service switching device 50 according to an embodiment of the present invention will be described with reference to FIG. 12.

First, the registration unit 53 updates and registers service status information for the first terminal 10 located in the first voice call service network S1 (S21-S24).

That is, when the location registration request in the first voice call service network (S1) for the first terminal 10 is confirmed from the second voice call signal, the registration unit 53 is the first for the first terminal 10. The service status information that matches the location registration status in the voice call service network (S1) and the location registration status in the second voice call service network (S2) is updated and registered, and the service status information is registered in the second voice call service network ( S2) Share with my location management device (60).

Further, the determining unit 51 is based on the second voice call signal received from the second voice call service network, that is, the second voice call signal received from the call processing device 40, the first voice call service network S1 It is determined whether or not voice call service switching is possible between and the second voice call service network (S2) (S25-S26).

At this time, the discrimination unit 51 responds to the outgoing request from the first voice call service network S1 identified from the second voice call signal, that is, the second voice call service network S2 of the second terminal 70. ) When the location registration status is confirmed, or the first voice call of the first terminal 10, that is, the receiving terminal for the incoming request to the first voice call service network S1 confirmed from the second voice call signal When the location registration status in the service network S1 is confirmed, it can be determined that the voice call service can be switched.

Thereafter, when it is determined that the voice call service can be switched, the switching unit 52 causes the second voice call signal to be processed in the second voice call service network S2 according to a predefined voice call service switching method, or In order to convert the second voice call signal to the first voice call signal, it is transmitted to the gateway device 30 located in the first voice call service network S1 (S27-S31).

At this time, the switching unit 52, when the outgoing request from the first voice call service network (S1) is confirmed from the second voice call signal, to the calling terminal in the second voice call signal, that is, the first terminal 10 The second voice call signal is processed in the second voice call service network (S2) by converting the subscriber virtual number in the first voice call service network (S1) to the subscriber number in the second voice call service network (S1). It is delivered to the processing device 40.

Here, switching the subscriber virtual number in the first voice call service network (S1) to the subscriber number in the second voice call service network (S2) is because the call back cannot be made when the subscriber virtual number is exposed as it is. The reason for this is to convert the subscriber to the actual subscriber number that can be received and deliver it.

On the other hand, when the incoming request from the second voice call signal to the first voice call service network is confirmed, the switching unit 52 inserts the service identification information into the second voice call signal, and the second voice according to the service identification information. The call signal is transmitted to the gateway device 30.

That is, the switching unit 52 transmits the second voice call signal into which the service identification information is inserted, to the call processing apparatus 40, and the call processing apparatus 40 that received the second identification signal according to the inserted service identification information The voice signal can be transmitted to the gateway device 30.

Here, the service identification information includes, for example, a subscriber virtual number (eg, mVoIP ID) in the first voice call service network (S1), access address information of the gateway device 30, header information of the second voice call signal, and At least one of the CELL-ID setting values in the access network information (P-Access-Network) is included.

On the other hand, the switching unit 52 in the second voice call service network (S2) of the calling terminal in the second voice call signal, that is, the second terminal 70 for the incoming request to the first voice call service network (S1) Needless to say, the subscriber number can be converted to the subscriber virtual number of the first voice call service network (S1).

As described above, according to the operation method of the gateway device 30 and the service switching device 50 according to an embodiment of the present invention, mVoIP transmission linked with LTE Cellular Network through voice call service switching between mVoIP and VoLTE / By enabling incoming calls, subscribers can use the voice call at a lower price while providing the same service as VoLTE through mVoIP Application, and in particular, it is possible to make a cheaper voice call in an outbound roaming situation abroad.

In addition, subscribers can use their existing numbers as they are when performing voice calls through mVoIP, providing higher convenience, and carriers can provide voice calls that are almost the same as VoLTE through mVoIP. It is possible to provide a service bypassed by mVoIP in the case of a total overload or failure, and various mVoIP operators can provide an API for voice service compatibility.

The operation method of the gateway device 30 and the service switching device 50 according to an embodiment of the present invention may be implemented in a form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. -Hardware devices specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa.

The present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above-described embodiments, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims below. Anyone with ordinary knowledge in the technical idea of the present invention extends to the extent that various modifications or modifications are possible.

According to the voice call service switching system of the present invention, a gateway device and a service switching device, and an operating method of the device, in that it enables mVoIP transmission / reception in connection with LTE Cellular Network through voice call service switching between mVoIP and VoLTE, As it surpasses the limitations of the existing technology, it is not only the use of the related technology, but also the possibility of commercially available or sales of the applied device, as well as the degree that it can be carried out in a realistic manner, making it an industrially applicable invention.

10: Terminal 1
20: call processing server
30: gateway device
31: receiving unit 32: conversion unit
40: call processing device
50: service switching device
51: discrimination unit 52: switching unit
53: Register
60: location management device
70: second terminal

Claims (17)

The application-based first voice call signal received from the first voice call service network is converted into a second voice call signal based on an IMS (IP Multimedia Subsystem) and transmitted to the second voice call service network. A gateway device that converts the second voice call signal received from the first voice call signal to the first voice call service network; And
When it is determined that the voice call service can be switched based on the second voice call signal received from the second voice call service network, the second voice call signal is generated according to the predefined voice call service switching method. Or a service switching device that allows a second voice call signal to be transmitted to the gateway device,
The service switching device,
When the location registration request in the first voice call service network is confirmed from the second voice call signal, the location registration status in the first voice call service network and the location in the second voice call service network for the terminal requesting the location registration A voice call service switching system characterized in that the service status information matching the registration status is updated and registered, and the service status information is shared with the location management device of the second voice call service network. delete delete delete delete A service switching device for switching the voice call service between the first voice call service network in which the application-based first voice call signal is processed and the second voice call service network in which the IMS (IP Multimedia Subsystem) -based second voice call signal is processed. In,
A determining unit for determining whether a voice call service is switchable based on a second voice call signal received from the second voice call service network; And
When it is determined that voice call service switching is possible, the second voice call signal is processed in the second voice call service network according to a predefined voice call service switching method, or the second voice call signal is first voice signal. It includes a switching unit to be delivered to the gateway device located in the first voice call service network to convert to,
When the location registration request in the first voice call service network is confirmed from the second voice call signal, the location registration status in the first voice call service network and the location in the second voice call service network for the terminal requesting the location registration The service switching device further comprising: a register for renewing and registering service state information matching the registration state, and sharing the service state information with the location management device of the second voice call service network. delete The method of claim 6,
The discrimination unit,
When the location registration status in the second voice call service network of the called terminal is confirmed with respect to the outgoing request from the first voice call service network confirmed from the second voice call signal, or the call request confirmed from the second voice call signal With respect to the service switching apparatus, it is determined that the voice call service can be switched when the location registration status in the first voice call service network of the called terminal is confirmed. The method of claim 6,
The switching unit,
When an outgoing request from the first voice call service network is confirmed from the second voice call signal, the subscriber's virtual number in the first voice call service network of the calling terminal in the second voice call signal is sent from the second voice call service network. A service switching device characterized in that the second voice call signal converted by switching to a subscriber number is processed in the second voice call service network. The method of claim 6,
The switching unit,
When an incoming request from the second voice call signal to the first voice call service network is confirmed, the service identification information is inserted into the second voice call signal and the second voice call signal is transmitted to the gateway device according to the service identification information. Service switching device, characterized in that to be. The method of claim 10,
The switching unit,
A service characterized by converting the subscriber number in the second voice call service network of the calling terminal in the second voice call signal to the subscriber virtual number in the first voice call service network in response to an incoming request to the first voice call service network. Switching device. delete delete Service switching to switch voice call service between the first voice call service network where the application-based first voice call signal is processed and the second voice call service network that is processed by the IMS (IP Multimedia Subsystem) -based second voice call signal In the operation method of the device,
A determining step of determining whether a voice call service switchover is possible based on the second voice call signal received from the second voice call service network; And
When it is determined that voice call service switching is possible, the second voice call signal is processed in the second voice call service network according to a predefined voice call service switching method, or the second voice call signal is first voice signal. It includes a conversion step to be delivered to the gateway device located in the first voice call service network to convert to,
When the location registration request in the first voice call service network is confirmed from the second voice call signal, the location registration status in the first voice call service network and the location in the second voice call service network for the terminal requesting the location registration And registering and renewing service status information matching the registration status, and sharing the service status information with the location management device of the second voice call service network. The method of claim 14,
The determining step,
When the location registration status in the second voice call service network of the called terminal is confirmed with respect to the outgoing request from the first voice call service network identified from the second voice call signal, or the call request confirmed from the second voice call signal With respect to the operation method of the service switching apparatus, characterized in that it is determined that the voice call service switching is possible when the location registration status in the first voice call service network of the called terminal is confirmed. The method of claim 14,
The conversion step,
When an outgoing request from the first voice call service network is confirmed from the second voice call signal, the subscriber's virtual number in the first voice call service network of the calling terminal in the second voice call signal is sent from the second voice call service network. A method of operating a service switching device, characterized in that the second voice call signal converted by switching to a subscriber number is processed in the second voice call service network. The method of claim 14,
The conversion step,
When an incoming request from the second voice call signal to the first voice call service network is confirmed, the service identification information is inserted into the second voice call signal and the second voice call signal is transmitted to the gateway device according to the service identification information. Method of operation of the service switching device, characterized in that to be.

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