KR102092191B1 - Abnormal call control method and apparatus - Google Patents

Abstract

The abnormal call processing method of the present invention is a process of determining whether the call is an existing call with an abnormal call truncation when a call connection request is received from the originating terminal, and if it is determined as the existing call, delete the existing call and then receive the terminal It may include a process of executing a connection request for a call connection with.

Description

Abnormal call processing method and its device {ABNORMAL CALL CONTROL METHOD AND APPARATUS}

The present invention relates to a technique for processing an abnormal call of a communication terminal for mobile communication, and more specifically, when a call is abnormally cut off due to entry into a weak electric field area, the call is processed as a garbage call to generate a new connection request. It relates to an abnormal call processing method and apparatus suitable for executing call processing without failure.

As is well known, the ALL-IP network can provide an interworking service with an Internet network using IP (Internet Protocol), and is a solution suitable for an integrated multimedia service including all of voice, data, and real-time video services. By providing), it is possible to obtain an effect of cost reduction through packet transmission.

As a core technology for providing a new service in an all-IP based communication environment, an IP multimedia subsystem (hereinafter referred to as an IP multimedia subsystem) is defined to provide various services to subscribers based on the ALL-IP network. "IMS"). Such an IMS can provide an IP service on a packet network regardless of an access network format, and can provide a service requiring multimedia data transmission such as a one-to-one video call as well as a general call service.

On the other hand, 3GPP Release 8 describes one of the mobile communication systems, EPC (Evolved Packet Core), which is a network architecture, and EPC is a set of network nodes for 3GPP Long Term Evolution (LTE) system. to be.

These EPCs have evolved the core network of the existing 3GPP system architecture to support Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), which is an evolved ERAN (Evolved RAN), and also improve the efficiency of the packet network. It has an efficient network structure that simplifies network nodes to increase. A wireless communication system including EPC and E-UTRAN may be referred to as an Evolved Packet System (EPS), and it can be considered that the LTE mobile communication system currently in service in Korea is applicable to this.

Accordingly, in a communication environment in which an LTE mobile communication system is built, subscribers can receive various types of mobile communication-related services through a communication terminal. In the mobile communication-related service, each communication terminal has a weak electric field area (communication shadow with weak radio waves). It can be provided smoothly when it is in the area (region) where communication service is available, not the area.

On the other hand, when the user presses the call end button while making a call to two communication terminals, the corresponding communication terminal generates a call end (BYE) message and transmits it to the mobile communication network through a base station (e.g., eNodeB). And the call connection between the called terminal and the called terminal is released (terminated).

However, when a mobile subscriber enters a weak electric field area during a call, the corresponding communication terminal is placed in a situation in which the call is disconnected without transmitting a call termination message to the base station.

In this case, in the mobile communication network, although the communication terminal is abnormally disconnected from the call, the call termination message for the communication terminal is not received. Therefore, an abnormal node in the mobile communication network (eg, a base station or a mobility management node) is abnormal. Until it is determined (recognized) as a call disconnection, it is regarded as being in a call and the call connection is maintained.

As described above, when the communication terminal raises a connection request (INVITE) again through a base station or the like while the existing call is in a busy state due to an abnormal call disconnection, the mobile communication network is in a busy state (connection request call). The call is considered as coming up, and the call is failed. As a result, the user of the communication terminal recognizes the abnormal call disconnection in the mobile communication network and releases (deletes) the existing call. There is a problem that is not provided.

Republic of Korea Registered Patent Publication No. 10-1007200, Announcement date of January 12, 2011. Republic of Korea Patent Publication No. 2007-0060655, Publication date June 13, 2007.

The present invention can process a connection request for a new call after forcibly deleting the existing call regardless of receiving a call termination message when a connection request comes up from the originating terminal in a situation in which the busy state remains after the call is abnormally disconnected. I would like to propose a new call processing technique.

The problem to be solved by the present invention is not limited to those mentioned above, and another problem to be solved that is not mentioned can be clearly understood by a person having ordinary knowledge to which the present invention belongs from the following descriptions. will be.

According to an aspect of the present invention, when a connection request for a call is received from an originating terminal, a process of determining whether the call is an existing call that has been abnormally cut or not, and if it is determined as the existing call, deletes the existing call and then receives the called terminal It provides an abnormal call processing method comprising the step of executing a connection request for the call connection with the.

According to another aspect of the present invention, when a call connection request is received from an originating terminal, a process of determining whether the call is an existing call maintaining a call state through searching for pre-stored terminal information, and as a result of the determination, the existing call If it is determined, an abnormal call processing method is provided that includes a process of deleting the existing call and executing a connection request process for a call connection between the calling terminal and the called terminal after completion of the deletion process.

In accordance with another aspect of the present invention, a message receiving unit receiving a call connection request from a calling party and a call state for determining whether the call received through searching for pre-stored terminal information is an existing call maintaining a call state As a result of the determination, the determination result, the terminal information management unit that deletes the existing call when it is determined to be the existing call, and when the deletion of the existing call is completed, generates and receives a connection request for a call connection between the calling terminal and the called terminal It provides an abnormal call processing apparatus including a call processing unit for transmitting to the side.

The present invention determines whether the call is an existing call that is abnormally disconnected when a call connection request is received from the originating terminal, determines that it is a garbage call when the call is an existing call, deletes the existing call, and then processes the call with a new terminal. By executing a connection request for call connection, it is possible to effectively prevent a call disconnection phenomenon for a new call due to an abnormal call disconnection.

1 is a network configuration diagram of a mobile communication system to which an abnormal call processing technique according to the present invention can be applied,
2 is a block diagram of a node device suitable for applying an abnormal call processing technique according to the present invention;
3 is a block diagram of an abnormal call processing apparatus according to the present invention,
4 is a flowchart for explaining a process of deleting an existing call that has been abnormally disconnected and requesting a new call when a connection request is raised in an abnormally disconnected call according to the present invention;
5 is a flowchart illustrating a main process of executing a connection request processing of a new call after deleting an existing call that has been cut according to the present invention.

First, advantages and features of the present invention, and methods for achieving them will be clarified by referring to embodiments described below in detail with reference to the accompanying drawings. Here, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and are common in the technical field to which the present invention pertains. The technical scope of the present invention should be defined by the claims, as it is provided by way of example so that a person with knowledge can clearly understand the scope of the invention.

In addition, in the following description of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, and it is needless to say that this may be changed according to intentions or customs of users, operators, and the like. Therefore, the definition should be made based on the technical idea described throughout the present specification.

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

1 is a network configuration diagram of a mobile communication system to which an abnormal call processing technique according to the present invention is applicable, a communication terminal (user equipment) (110/1, 110/2), a base station (eNodeB) 120/1, 120/2), a mobile communication network 130, a first intelligent network (IMS: IP Multimedia Subsystem) 140, a second intelligent network (IMS: IP Multimedia Subsystem) 150, and the like.

Referring to FIG. 1, when the communication terminal (UE-A) 110/1 is an originating terminal, the communication terminal (UE-B) 110/2 may be defined as a destination terminal or vice versa. Each communication terminal (110/1, 110/2) provides a packet-based voice call service, a packet-based video call service, a packet-based data communication service, and the like from each corresponding base station (120/1, 120/2). It means a user terminal that can be received, for example, an LTE subscriber terminal, a VoLTE subscriber terminal supporting HD voice, and the like. Here, between each communication terminal (UE-A, UE-B) and each base station (120/1, 120/2), for example, a cell or radio unit including a mobile communication antenna, a mobile communication repeater, etc. installed in a building, etc. RU: radio unit), a relay device that can be defined (name) may be further installed.

Next, when the base station 120/1 is the base station of the calling party (for the calling terminal), the base station 120/2 may be defined as the base station of the called party (for the calling terminal) or vice versa. The base stations 120/1 and 120/2 are equipment supporting next-generation technologies and services such as LTE (or VoLTE), and may also be defined (named) as a base station, base station equipment, or base station equipment, and radio bearer control. ), Radio admission control (radio admission control), connection mobility control (connection mobility control), to provide a radio resource management (radio resource management) functions, such as dynamic resource allocation (dynamic resource allocation) to the communication terminal (or user terminal) You can.

In addition, each base station (120/1, 120/2) is IP header compression and decryption of the user data stream (encryption), routing of user plane data to the signal processing node 134, scheduling of paging messages And transmission, scheduling and transmission of broadcast information, and measurement and measurement reporting settings for mobility and scheduling.

Moreover, each base station (120/1, 120/2) detects when a communication terminal in a call enters a weak electric field area (a shadowed area in which the radio wave is weak) and the call is abnormally cut (exception of abnormal call), and is abnormal. Providing functions such as generating an abnormal termination message (for example, an termination message including an abnormal call disconnection status code) indicating termination of a call due to call disconnection and transferring it to the mobility management node 132 in the mobile communication network 130 can do.

Here, the exception handling of the abnormal call may be performed, for example, through monitoring of a packet exchanged between the calling terminal and the called terminal, for example, when the called terminal is an LTE terminal, it may take about 10 seconds or so, and the incoming call may take place. When the terminal is a legacy terminal (3G terminal, 2G terminal, etc.), it may take several tens of seconds.

In addition, in order to enhance convenience and understanding of description, only two base stations are exemplarily illustrated in FIG. 1, for example, communication services (eg, voice call service, video call service, group video) for hundreds to thousands of base stations. Various multimedia services including call service, additional information service, etc.) can be controlled (controlled) by the mobility management node 132 in the mobile communication network 130, and dozens of base stations can track a single TA (Tracking Area) area ( Or a group).

Next, the mobile communication network 130, for example, may mean an LTE mobile communication system (or LTE network), a mobility management node (eg, MME: Mobility Management Entity) 132, a signal processing node (eg, SGW) : Serving Gateway (134), a packet processing node (eg, PGW: PDN Gateway) 136, and a policy management node (eg, PCRF: Policy & Charging Rule Function) 138. Here, the SGW 134 and the PGW 136 may be defined as separate user plane nodes or integrated user plane nodes, and each node constituting the mobile communication network 130 (eg, MME, SGW, PGW, PCRF) Etc.) may be partially or selectively integrated or replaced with other components depending on the network environment of the mobile communication network system.

In addition, the mobility management node 132 may refer to a node that manages mobility of a communication terminal through a signal control charge between the base station and the signal processing node 134, session management, idle subscriber management, It can be in charge of paging and subscriber authentication functions. That is, each base station controls a control plane, such as processing a control signal when there is a request for combining or a radio bearer setup request from a communication terminal or another network node, such as a signal processing node 134 or a packet processing node 136. It can perform various functions of (control plane) and receives subscriber profile information, authentication and location related data from HLR (home location register) not shown, and manages EPS bearer or IP tunnel setup and mobility It can provide functions such as (mobility management). Here, the HLR may store and manage subscriber profile information, authentication, and location-related data of the terminal.

Here, the mobility management node 132, as in the above-described base station, the communication terminal in communication enters the weak electric field area (the communication shadow is weak communication area) and handles it when the call is abnormally cut (exception of abnormal call) Signal processing node by generating an abnormal termination message (e.g., an termination message including an abnormal call disconnection status code) that signifies termination of a call due to an abnormal call disconnection when exception processing is executed. It can provide functions such as delivery to (134). Here, the exception handling of the abnormal call may be performed in the same or similar manner as in the base station described above according to the type (network type) of the called terminal.

In addition, the signal processing node 134 processes payload traffic according to a preset session based on a communication policy in the network provided from the policy management node 138 through the packet processing node 136 described later. A user plane node that performs session control, etc., interworking with a base station and an S1-U interface, supporting LTE mobile communication systems and hand-offs in 3GPP networks, and packet processing nodes (136) and EPS bearer (Evolved Packet System bearer) can be set and tunneling can be used to perform functions such as delivering a PDU (Packet Data Unit).

Next, the packet processing node 136 allocates the IP of the terminal device according to the communication and charging policy provided from the policy management node 138, and performs a user plane for controlling sessions interworking with an external Internet network and a non-3GPP network. As a node, it maintains routing information with the signal processing node 134 and an external network for packet service, provides tunneling and IP routing functions through organic linkage with an intelligent network, and sends them to the signal processing node 134 and the external network. A PDU may be delivered, and functions such as delivering policy priority information provided from the policy management node 138 to the signal processing node 134 may be provided.

In addition, the policy management node 138 provides dynamic QoS and charging rules according to service data flow to manage and process communication policies and charging policies, etc. in the mobile communication network. Can perform the function of

Meanwhile, the first intelligent network 140 may mean, for example, an IP Multimedia Subsystem (IMS), which may be defined as an intelligent network node, and an originating-call session control function (O-CSCF) 142 ), A subscriber information node (HLR: Home Location Register) 144, and an originating application service node (O-AS: Originating-Application Server) 146.

First, the outgoing call session control node (O-CSCF) 142 is an infrastructure system that performs call processing and performs a basic function for controlling a multimedia session based on Session Initiation Protocol (SIP), such an outgoing call session The control node 142 handles subscriber registration, authentication, charging, triggering and routing for each service, callee location inquiry, and compression and decompression of SIP messages, and is divided into Proxy_CSCF, Interogating-CSCF, Serving-CSCF, etc. according to the role. You can.

In addition, the subscriber information node (HLR) 144 refers to a server node including a database in which subscriber information, etc. for a mobile communication network (eg, LTE network) is stored, related to subscriber profile information, authentication, and location of the terminal. It is possible to provide a function for storing and managing data. Here, the HLR 144 may be defined (collectively) as a Home Subscriber Server (HSS) capable of providing the same or similar functions.

Subsequently, the originating application service node (O-AS) 146 includes messages for additional service operations and call processing, call connection management, and call processing, such as caller ID, call / prohibition, call forwarding, and group video calls. It can provide the function to perform field change, etc., interworking with various nodes for billing processing and call session control node (CSCF), subscriber information node (HLR), multimedia resource node (MRF), and additional service execution And operation (Operation), administration (Administration), maintenance (Maintenance), and the like, and for this purpose, the originating application service node 146 may have a configuration as shown in FIG. 2 as an example. The detailed functions provided by the originating application service node 146 will be described in detail later with reference to FIG. 2. Here, the originating application service node (O-AS) may be defined as O-TAS (Originating-Telephony Application Server).

In addition, when the call connection request (SIP INVITE message) is received from the calling call session control node 142, the calling application service node 146 determines whether the call is an existing call that has been abnormally cut, that is, maintains a call state. It is determined whether it is an existing call in progress, and when it is determined to be an existing call, it is regarded as a garbage call that is cut off (determination), deletes the existing call, and executes a connection request for call connection with the called terminal The process is performed, for example, with reference to the accompanying FIG. 5, which will be described later in detail.

On the other hand, the second intelligent network 150, like the first intelligent network 140 described above, may mean an IMS (IP Multimedia Subsystem), and an incoming call session control node (T-CSCF: Terminating-Call Session Control). Function) 152, a subscriber information node (HLR: Home Location Register) 154, and an incoming application service node (T-AS: Terminating-Application Server) 156. The functions in (152, 154, 156) are substantially the same as those in the first intelligent network (140) and corresponding nodes (142, 144, 146).

Therefore, in order to avoid unnecessary redundant description for the simplification of the specification, detailed descriptions of functions of the respective nodes 152, 154, and 156 constituting the second intelligent network 150 are omitted here.

2 is a block diagram of a node device suitable for applying an abnormal call processing technique according to the present invention, a call processing block 202, a subscriber DB 204, a billing block 206, an interworking interface block 208, and an OAM Block 210 and the like.

Referring to FIG. 2, the call processing block 202 performs additional service operations such as caller ID, call / no call forwarding, call forwarding, group video call, call processing, call connection management, and message field change for call processing. To this end, the call processing block 202 may include an abnormal call processing device having a configuration as shown in FIG. 3.

3 is a block diagram of an abnormal call processing apparatus according to the present invention, and may include a message reception unit 302, a call status determination unit 304, a terminal information management unit 306, and a call processing unit 308.

Referring to FIG. 3, the message receiving unit 302 receives the call connection request (eg, SIP INVITE message) from the calling party, that is, when the call connection request is received from the calling call session control node 142, the call state determination unit It is possible to provide a function such as delivery to 304.

In addition, the message receiving unit 302 is a normal call termination (BYE) message from the call session control node 142 (that is, the call termination message transmitted by the calling terminal to the mobile communication network when the call is normally terminated between the calling terminal and the called terminal). When received, it is transmitted to the terminal information management unit 306 and the call processing unit 308, respectively, and when the abnormal termination message indicating termination of the call due to the abnormal call disconnection is received from the call session control node 142, the terminal information is received. Functions such as delivery to the management unit 306 and the call processing unit 308, respectively, can be provided.

Next, the call state determining unit 304 calls the call that sent the connection request through the terminal information search of the subscriber DB 204 of FIG. 2 when the SIP INVITE message (connection request message) is transmitted from the message receiving unit 302 It is determined whether it is an existing call (ie, an existing call that maintains a call state after the abnormal call is cut) or a new call, and the result of the determination is determined by the terminal information management unit 306 and the call processing unit 308. It can provide a function such as passing each.

To this end, in the subscriber DB 204 of FIG. 2, registration status information including additional service status of the subscriber and terminal information (ie, terminal information related to call connection of each communication terminal) is pre-stored.

Then, the terminal information management unit 306 determines that the existing call is an abnormal call truncated garbage call when the call that sent the connection request from the call status determination unit 304 is notified of an abnormal call truncation. A function such as deleting the corresponding terminal information stored in (204) (deleting the terminal information for the call connection of the corresponding communication terminal) can be provided.

In addition, the terminal information management unit 306 may provide a function such as deleting the corresponding terminal information stored in the subscriber DB 204 when a normal call termination (BYE) message or abnormal termination message is transmitted from the message receiving unit 302. have.

Next, the call processing unit 308 generates a call end (BYE) message when deletion of an existing call (that is, an existing call that maintains a call state after an abnormal call is cut) is completed according to the present invention. Forward to the originating call session control node 142 for transmission (i.e., execution of the existing call deletion processing) to the (incoming intelligent network side), and after the time when the existing call deletion processing on the called party is completed, Creates a connection request (SIP INVITE message) for a new call connection of the server and transmits it to the called party (the called intelligent network side) and transmits it to the originating call session control node 142 for transmission (that is, execution of connection request processing of the new call) Can provide the function of

In addition, the call processing unit 308 generates a call end (BYE) message when a normal call end (BYE) message or abnormal end message is transmitted from the message receiving unit 302 and transmits it to the called party (the called intelligent network side) (ie For the execution of call deletion processing), a function such as delivery to the originating call session control node 142 may be provided.

Referring back to FIG. 2, the charging block 206 may provide a function for performing related charging processing when communication terminals are provided with additional services, etc. performed by an intelligent network, and the interworking interface block 208 controls call session Functions such as interworking with nodes (CSCF), subscriber information nodes (HLR), application service nodes (OS), and various nodes required for performing various additional services may be performed.

In addition, the OAM (Operation Administration Maintenance) block 210 may provide a function for processing the operation, administration, maintenance, etc. of the originating application service node 146 in the intelligent network 140. have.

Next, a series of processes for processing an abnormal call according to the present invention using a mobile communication system having the above-described configuration will be described in detail.

4 is a flowchart for explaining a process of deleting an existing call that has been abnormally disconnected and requesting a new call when a connection request is raised in an abnormally disconnected situation according to the present invention.

Referring to FIG. 4, while a communication service is in progress while a call is connected between an originating terminal (UE-A) and a destination terminal (UE-B), the originating terminal (UE-A) is in a weak electric field area (communication shaded area with weak radio waves) ), The call of the originating terminal (UE-A) is abnormally disconnected without transmitting a call end (BYE) message to the base station 120/1 (step 401).

As described above, in the state in which the call of the originating terminal (UE-A) is abnormally disconnected, the base station 120/1 or the mobility management node 132 in the mobile communication network 130 detects an abnormal call disconnection, and the detection result (that is, The abnormal termination message, which means the end of the call due to the abnormal call disconnection), is transmitted to the intelligent network side. Before the abnormal call disconnection is detected, the originating terminal (UE-A) sends a connection request (SIP INVITE message) for re-calling. When the connection request message is transmitted to the originating application service node 146 through a path via the base station 120/1, the mobile communication network 130, and the outgoing call session control node 142 in the first intelligent network 140 (Steps 402, 403).

Next, the originating application service node 146 determines whether the call that sent the connection request is an existing call (that is, an existing call that maintains a call state after being disconnected from an abnormal call) or a new call. After deleting, a process of requesting a new call to be connected is performed (step 404), which will be described in detail with reference to FIG. 5.

5 is a flowchart illustrating a main process of executing a connection request processing of a new call after deleting an existing call that has been cut according to the present invention.

Referring to FIG. 5, when a connection request (eg, a SIP INVITE message) of a call is received from the originating call session control node 142, the message receiving unit 302 transmits the call to the call state determining unit 304 (step 502).

Next, in the call state determining unit 304, when a connection request message (SIP INVITE message) is received through the message receiving unit 302 (step 502), terminal information in the subscriber DB 204 (call connection of each communication terminal) (Step 504), by searching for the terminal information related to whether or not the corresponding call that sent the connection request is a new call or an existing call that is in a call state, that is, an existing call that maintains a call state after being disconnected from an abnormal call. Discrimination (steps 506, 508).

As a result of the determination in step 506, when the call that sent the connection request is a new call, the call status determination unit 304 notifies it to the call processing unit 308, and the subsequent processing proceeds to step 512, which will be described later. , The call processing unit 308 generates a connection request (SIP INVITE message) for a new call connection between the calling terminal and the called terminal according to a normal call processing procedure, and transmits it to the called party (the called intelligent network side), that is, the connection of the new call Request processing will be executed.

As a result of the determination in step 508, if it is determined that the call that sent the connection request is an existing call that maintains a call state after being disconnected from the abnormal call, the terminal information management unit 306 displays the existing call as an abnormal call truncated garbage ( garbage) is executed as a call (deletion of the terminal information for the call connection of the communication terminal) for the corresponding terminal information stored in the subscriber DB (204) (step 510).

Next, the call processing unit 308 generates a call end (BYE) message when the deletion of the existing call maintaining the call state is completed after the abnormal call is disconnected and transmitted to the called party (the called intelligent network side), that is, the called party In the deletion process for the existing call to be executed, and then processing the connection request for the new call (step 512), to complete the call connection for the new call (step 514), with reference to Figure 4 for this Explain.

That is, referring to FIG. 4, the originating application service node 146 generates a call end (BYE) message when the deletion process for the existing call is completed, and the incoming call is routed through the originating call session control node 142. And transmit to the call session control node 152 (steps 405, 406).

As a result, after the incoming call session control node 152 communicates (transmits and receives) the call termination message with the incoming application service node 156 (steps 407 and 408), the call is made to the called terminal (UE-B) through the mobile communication network. By sending an end message (step 409), call termination to the called terminal is handled.

Again, the originating application service node 146 generates a connection request (SIP INVITE message) for a new call connection between the originating terminal and the called terminal after the completion of the existing call termination processing at the called party, and the originating call session control node (142) (step 410), and the outgoing call session control node 142 transmits the connection request to the incoming call session control node 152 (step 411).

Thereafter, the incoming call session control node 152 communicates (transmits and receives) a connection request message with the incoming application service node 156 (steps 412 and 413), and then requests a connection to the called terminal (UE-B) through the mobile communication network. By sending a message (step 414), the call between the calling terminal and the called terminal is connected.

On the other hand, in an embodiment of the present invention, an application service node (outgoing application) deletes processing of an existing call (that is, an existing call that raises a connection request in an abnormal call disconnected state) from which a connection request is received from an existing call maintaining a call state. Service node), but the present invention is not necessarily limited to this, and the abnormal call disconnected state is applied to the call session control node (outgoing call session control node) by applying constituent members capable of performing related functions. Needless to say, the call session control node may be designed to perform deletion processing for an existing call that raises a connection request in.

On the other hand, in the exemplary embodiment of the present invention, it has been described as separating into an intelligent network of a calling party and an intelligent network of a called party to perform processing for deleting an existing call and processing a connection request for a new call, but the present invention is not limited thereto. Of course, it can be designed to implement the deletion processing of existing calls and the connection request processing of new calls by constructing with the integrated intelligent network of. In this case, it may be designed to configure only one call session control node and an application service node.

Moreover, in the exemplary embodiment of the present invention, it has been described as a case where the called terminal is an LTE terminal, but the present invention is not necessarily limited thereto, and the same can be applied even when the called terminal is a legacy terminal. In this case, the originating application service node in the first intelligent network generates a call release (CALL RELEASE) message to perform signaling conversion between the media gateway control node, that is, the SIP and the ISDN User Part (ISUP) used in the circuit (line) switching network. It will be transmitted to the circuit network (eg, 3G mobile communication network) side through a supported media gateway control node (MGCF: Media Gateway Control Function).

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may have various substitutions, modifications, changes, etc. without departing from the essential characteristics of the present invention. You will easily see this possible. That is, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments.

Therefore, the protection scope of the present invention should be interpreted by the claims that will be described later, and all technical ideas within the equivalent scope thereof should be interpreted as being included in the scope of the present invention.

According to an embodiment of the present invention, when a connection request for a call is received from the calling terminal, it is determined whether the call is an existing call that is abnormally disconnected, and if the call is an existing call, it is determined as a garbage call, and the call is deleted and then processed. A connection request for a new call connection with a terminal is executed, and through this, an abnormal call processing model capable of effectively preventing a call disconnection phenomenon for a new call due to an abnormal call disconnection can be provided.

The present invention including such a technical configuration can be applied to a VoLTE (or LTE) mobile communication network or a heterogeneous mixed mobile communication network, thereby improving service quality in a VoLTE (or LTE) communication service or a heterogeneous mixed communication service.

302: message receiving unit 304: call status determining unit
306: terminal information management unit 308: call processing unit

Claims (7)

In the abnormal call processing method of the abnormal call processing apparatus,
When a call connection request is received from the calling terminal to the called terminal while maintaining a call connection state between the calling terminal and the called terminal at the base station in the mobile communication network, the connection is received regardless of whether a call connection request is received from the called terminal. Determining that the requested call is an existing call that maintains a call state with the called terminal at the base station in the mobile communication network after the abnormal call is disconnected from the mobile communication network;
Process of executing a connection request for call connection with the called terminal after deleting the existing call based on the determination
Unusual call processing method comprising a. According to claim 1,
Deletion of the existing call,
It is executed through the application service node or call session control node in the intelligent network.
How to handle abnormal calls. delete delete A message receiver configured to receive a call connection request from the calling terminal to the called terminal while maintaining a call connection state between a calling terminal and a called terminal at a base station in a mobile communication network;
Call state with the called terminal at the base station in the mobile communication network after the connection requested call received through the search for pre-stored terminal information is disconnected from the mobile communication network regardless of whether the call connection request is received from the called terminal A call state determination unit determining that the call is an existing call,
A terminal information management unit for deleting the existing call based on the determination;
When the deletion of the existing call is completed, a call processing unit that generates a connection request for a call connection between the calling terminal and the called terminal and transmits it to the called party
Abnormal call processing apparatus comprising a. The method of claim 5,
The terminal information management unit,
When an abnormal termination message indicating termination of a call due to an abnormal call disconnection is received from the mobile communication network, the corresponding terminal information for the call connection stored in the subscriber DB is deleted.
Abnormal call processing device. The method of claim 6,
The abnormal termination message,
Generated and transmitted from a base station or a mobility management node in the mobile communication network
Abnormal call processing device.

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