KR100985973B1 - Apparatus, system and method for changing service in mobile communication system - Google Patents

Abstract

The present invention relates to an apparatus, a system, and a method for switching a call service in a mobile communication system. An apparatus, system, and method for switching call services in a mobile communication system.

In a mobile communication system according to an embodiment of the present invention, a system for switching call services sets a priority for a call service switch request sent to a counterpart terminal and a call service switch request sent from the counterpart terminal, and sets the priorities. Set the priority of the terminal for the call service switching, and the call service switching request received from the terminal and the call service switching request of the counterpart terminal received from the counterpart exchange connected to the counterpart terminal. And a switch for making call service switching according to the set priority.

SCUDIF, Call Service Transition

Description

Apparatus, system and method for changing service in mobile communication system

The present invention relates to an apparatus, a system, and a method for switching a call service in a mobile communication system, and can solve a call service switch request collision situation that may occur when the calling terminal and the called terminal request a call service switching at a similar time. An apparatus, system, and method for switching call services in a mobile communication system are provided.

Modern mobile communication systems provide the capability to handle not only voice communications, but also multimedia transmissions such as the transmission of photos, videos, music and the like. Various protocols for integrating multimedia into mobile communication systems are defined in the 3rd Generation Partnership Project (3GPP), which is a joint standardization project of various standardized bodies in Europe, Japan, Korea, the United States, and China. The 3GPP protocol is, for example, a third generation network as configured in accordance with the Universal Wireless Telecommunications Network (UMTS) standard, as well as a second generation wireless communication network as configured according to the Global System for Mobile (GSM) standard. Used in

In previous 3GPP protocols, such as 3GPP TS 24.008 R99, only one call service, either voice call service or multimedia call service, was available. Therefore, a user who wants to temporarily switch between the voice call service and the multimedia call service needs to end the call and switch the service. To solve this problem, Service Change & Unrestricted Digital Information Fallback (SCUDIF) has been incorporated into 3GPP protocols such as R5 of 3GPP.

SCUDIF not only enables service switching while a call is connected between terminals supporting voice call service and multimedia call service, but also when there is a terminal supporting only one call service of voice call service or multimedia call service. Replace with a supported call service.

When the calling terminal and the called terminal that support the SCUDIF function in the mobile communication system are connected to the call service when the calling terminal and the called terminal both request the call service switching at the same time, each terminal is required to switch the call service requested by the mobile terminal. Since the response is not received, the mobile terminal is unable to respond to the call service switch request from the counterpart terminal.

For example, when the calling terminal and the called terminal are connected to the multimedia call service and both terminals request a switch of the voice call service at a similar point in time, each terminal receives a call service switching request from the other terminal. Since the call service request is not received, the call service is disconnected because the call service switch request from the counterpart cannot be answered.

In addition, since the user of each terminal does not know the situation that both terminals requested to switch the call service at a similar time point, as described above, when the call service is disconnected and the call service is disconnected, it is regarded as a failure. There is a problem that can be recognized and thereby the satisfaction of the user may be lowered.

Therefore, there is a demand for a method for resolving a call service switching request collision situation that may occur when the calling terminal and the called terminal request a call service switching at a similar time.

The present invention sets the priority of the call service switching request from each terminal when the calling terminal connected to the call service and the called terminal request the call service switching at a similar time point, and the call service switching is performed according to the set priority. Accordingly, an object of the present invention is to provide an apparatus, a system, and a method for switching a call service in a mobile communication system that can prevent a collision caused by a call service switch request from each terminal.

The object of the present invention is not limited to the above-mentioned object, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

An apparatus for switching a call service in a mobile communication system according to an embodiment of the present invention for achieving the above object includes a call service switching request from a first terminal and a second terminal connected to a call service from the first terminal. A service switch request receiving unit for receiving a call service switch request through an exchange connected with the second terminal, a priority setting unit for setting a priority for the call service request from the first terminal and the switch, and the set priority And a control unit for making a call service switch according to the call service switch request according to the ranking.

In the mobile communication system according to an embodiment of the present invention for achieving the above object, the apparatus for switching the call service, a call service switch request transmission unit for transmitting a call service switch request for the call service connected to the counterpart terminal, A call service switch request receiver for receiving a call service switch request from the counterpart terminal from the switch, and a priority for a call service switch request sent to the switch and a call service switch request sent from the switch; And a control unit to switch the call service according to the set priority.

In the mobile communication system according to an embodiment of the present invention for achieving the above object, the system for switching the call service, the priority of the call service switching request sent to the counterpart terminal and the call service switching request sent from the counterpart terminal A call service switching request received from the terminal and a call service switching request of the counterpart terminal received from the counterpart exchange connected to the counterpart terminal. And a switch for setting the priority of the service and switching the call service according to the set priority.

In the mobile communication system according to an embodiment of the present invention for achieving the above object, a method for switching the call service, the terminal for the call service switch request and the call service switch request transmitted from the counterpart terminal Setting a priority and causing a call service switchover according to the set priority, and a call service switch request received from the terminal by the exchange and a call of the counterpart terminal received from the counterpart exchange connected with the counterpart terminal. Setting a priority for the service switching request and making the call service switching according to the set priority.

Apparatus, system and method for call service switching in a mobile communication system according to an embodiment of the present invention have the following effects.

When the calling terminal connected to the calling service and the called terminal request the call service switching at the same time, each terminal does not receive a response to the call service switching request, and thus the call terminal switches the call service switching request from the other terminal. There is an effect that can prevent the disconnection of the call service to improve the user's satisfaction.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Hereinafter, an embodiment of the present invention with reference to the drawings for a configuration diagram or a process flow chart for explaining an apparatus, a system and a method for providing an apparatus and a method for switching a call service in a mobile communication system according to embodiments of the present invention. Explain the specific content for

At this time, it is to be understood that like reference numerals refer to like elements throughout the specification, and that each configuration of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions.

Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in the flowchart configuration (s). It creates a means to perform the functions.

These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart configuration (s).

Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart configuration (s).

In addition, each configuration may represent a module, segment or portion of code that includes one or more executable instructions for executing a specified logical function (s).

It should also be noted that in some alternative embodiments, the functions noted in the configurations may occur out of order. For example, the two components shown in succession may in fact be performed substantially simultaneously or the components may sometimes be performed in the reverse order, depending on the function in question.

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

1 is a block diagram illustrating a mobile communication system according to an embodiment of the present invention. In this case, the mobile communication system of FIG. 1 may be understood as a Global System for Mobile Communication (GSM) and Universal Mobile Telecommunication System (UMTS) system supporting 3GPP protocol, but is not limited thereto. 1, although there are a number of typical components that make up a mobile communication system, an originating exchange (Originating MSC) and terminating MSC (hereinafter referred to as "O-MSC") for an embodiment of the present invention. T-MSC "will be described by way of example, and the mobile communication system according to the embodiment of the present invention will be described by way of example which supports the SCUDIF function or the like.

As shown, the mobile communication system 100 according to an embodiment of the present invention is an originating mobile station (hereinafter referred to as "O-MS") 101, O-MSC 102, T-MSC ( 103) and a terminating mobile station (hereinafter referred to as "T-MS") 104, and the SCUDIF function is O-MS 101, O-MSC 102, T-MSC 103 ) And T-MS 104. In addition, although not shown in FIG. 1, it is obvious that the mobile communication system 100 of FIG. 1 may include a gateway MSC (GMSC), a home location register (HLR), and the like, which are typical components of the mobile communication system. Can be.

2 is a flowchart illustrating a call processing procedure in the above-described mobile communication system of FIG. 2 illustrates an example of a SCUDIF call processing procedure in a mobile communication system.

As shown, the call processing procedure in the mobile communication system according to an embodiment of the present invention, if the first O-MS 101 wants to use the call service with the T-MS (104), O-MS (101) Transmits a "SETUP" message for setting up an audio call or a video call to the O-MSC 102 (S111). In this case, the "SETUP" message may include information on call services supported by the O-MS 101 (eg, multimedia call service or voice call service) and preferred call services. For example, as shown in FIG. 2, the "SETUP" message may include information such as a Repeat Indicator (RI), a MultiMedia (MM), and a Speech (SP), indicating that the RI supports the SCUDIF function. A case where the MM indicates a multimedia call service such as a video call and the SP indicates a voice call service will be described. At this time, the preferred call service can be known according to the service order included in the "SETUP" message, and in FIG. 2, since the MM is ahead of the SP, the O-MS 101 prefers the MM, and the SP is possible later. It can be understood as indicating. In this case, the call service supported by the embodiment of the present invention means a call service available in the O-MS 101 or the T-MS 104, and the O-MS 101 or the T-MS, which is a preferred call service. An example in which 104 denotes a call service to be used when connecting to a call service with a counterpart terminal will be described.

The O-MSC 102 transmits an "IAM (Initial Address Message)" message to the T-MSC 103 based on the "SETUP" message transmitted from the O-MS 101 (S112). In this case, the "IAM" message may include codec information of the call services supported by the O-MS 101 and the preferred call service. In FIG. 2, mm is codec information for a multimedia call service, and AMR (Adaptive Multi Rate) may be understood as codec information for a voice call service. At this time, in the above-described step S111, a message including information on the call service is transmitted, and in step S112, a message including the information about the codec for the call service is transmitted, but this is merely an example to help understanding of the present invention. As such, the information about the call service and the codec information for the call service may be understood to be used to indicate the type of call service supported by the O-MS 101.

When the T-MSC 103 transmits an "IAM" message from the O-MSC 102, the T-MSC 103 performs a paging procedure with the T-MS 104 (S113), and based on the transmitted "IAM" message, The MS 104 transmits a " SETUP " message for establishing a voice call or a video call to the T-MS 104 (S114). At this time, the "SETUP" message transmitted from the T-MSC 103 to the T-MS 104 is a preferred call with the call services supported by the O-MS 101, such as the "SETUP" message of step S110 described above. Information about the service may be included.

The T-MS 104 sends a " CALL CONFIRMED " message containing information about the call services supported by the T-MS 104 and the preferred call service for the " SETUP " message sent from the T-MSC 103. Is transmitted to the T-MSC 103 (S115). In this case, the case where the O-MS 101 and the T-MS 104 support the same call services and prefer the same call service will be described with reference to FIG. 2. Thus, the T-MS 104 also supports a multimedia call service and a voice call service, and it can be understood that the multimedia call service is preferred.

On the other hand, the call service information included in the "CALL CONFIRMED" message of step S115 described above may be understood that the user of the T-MS 104 is set in advance. In other words, the user of the T-MS 104 checks the call services supported by the T-MS 104 and sets a preferred call service among the supported call services in advance, so that the O-MS ( 101) to allow a call to be connected to a preset call service when the call originates.

The T-MSC 103 transmits an "APM (Application transport Message)" message to the O-MSC 102 based on the "CALL CONFIRMED" message transmitted from the T-MS 104 (S116). In this case, since the T-MS 104 also supports the multimedia call service and the voice call service in FIG. 2, and prefers the multimedia call service, mm, which is codec information for the multimedia call service, is selected in the "APM" message, and mm and AMR Information may be included that this is available.

The O-MSC 102 transmits a "CALL PROCEEDING" message to the O-MS 101 based on the transmitted "APM" message (S117). At this time, the "CALL PROCEEDING" message transmitted to the O-MS 101 may include information on the call services supported by the T-MS 104 and the preferred call service. In FIG. Although the case where the 101 and the T-MS 104 support the same call services and prefer the same call service (Normal Case) is described as an example, the call service information included in the "CALL PROCEEDING" message is the same call. Services may be supported but may prefer different call services (Reverse Case), or may support only one of a plurality of call services (Fallback Case). At this time, the fallback case supports all the call services supported by the O-MS 101 in the T-MS 104, but can be connected to only one call service by the user, or the T-MS 104 has one It can occur when only the call service is supported.

After receiving the "CALL PROCEEDING" message, the O-MS 101 performs a radio resource allocation procedure for the call service connection between the O-MS 101 and the T-MS 104 (S118). 102 transmits a " COT (Continuity Message) " message indicating the radio resource allocation to the T-MSC 103 (S119).

The T-MSC 103 performs a radio resource allocation procedure with the T-MS 104 (S120), and the T-MS 104 transmits an "ALERTING" message indicating the radio resource allocation to the T-MSC 103. (S121), the T-MSC 103 transmits an "ACM (Address Complete Message)" message to the O-MSC 102 in response to the "COT" message of step S119 described above (S122), The MSC 102 transmits an "ALERTING" message to the O-MS 101 (S123). When the user of the T-MS 104 presses a call button or the like, a "CONNECT" message is transmitted to the T-MSC 103 (S124), and the T-MSC 103 "ANM (Answer Message)" message. Is transmitted to the O-MSC 102 (S125), and when the "CONNECT" message is transmitted from the O-MSC 102 to the O-MS 101 (S126), the O-MS 101 and the T-MS ( The call service of 104 is connected to allow a call.

Then, when the T-MS 104 wants to switch to the call service, for example, when the user wants to switch to the voice call service while using the multimedia call service, the user of the T-MS 104 switches to the voice call service. Upon request, the T-MS 104 transmits a "MODIFY" message containing the call service information to be switched to the T-MSC 103 (S127), and the T-MSC 103 and the T-MS 104. ) Performs the radio resource allocation procedure for the voice call service (S128).

In the T-MSC 103, the O-MSC sends an "APM" message containing information indicating that the T-MS 104 wants to use the voice call service and that the multimedia call service is available based on the transmitted "MODIFY" message. In step S129, the O-MSC 102 transmits a "MODIFY" message based on the transmitted "APM" message to the O-MS 101 (S130). At this time, the O-MS 101 may provide a user interface that allows a user of the O-MS 101 to determine call service switching according to the "MODIFY" message received from the O-MSC 102. The user of the O-MS 101 may approve or reject the call service transition through the provided user interface. If the user of the O-MS 101 approves the call service switching, the O-MS 101 transmits a "MODIFY COMPLETE" message to the O-MSC 102 (S131), and voices the O-MSC 102 with the voice. The radio resource allocation procedure for the call service is performed (S132). If the user of the O-MS 101 refuses to switch the call service, the message “MODIFY REJECT” may be transmitted instead of the “MODIFY COMPLETE” message.

When the O-MSC 102 performs the radio resource allocation procedure for the switched service in the O-MS 101, the O-MSC 102 transmits an "APM" message indicating this to the T-MSC 103, and the T-MSC 103 ) Transmits a "MODIFY COMPLETE" message to the T-MS 104 indicating completion of switching of the call service (S134).

Of course, FIG. 2 illustrates a case in which the T-MS 104 requests a call service switching, for example. However, this is merely an example to help understanding of the present invention. Call service switching request in step 1) may be similarly applied to steps S127 to S134 described above.

In this case, in the above-described call service switching process of FIG. 2, a case in which one of the O-MS 101 and the T-MS 104 requests the call service switching is described as an example, but the O-MS ( 101) and when the T-MS 104 requests the call service switchover at a point in time which is almost the same time, each terminal does not receive a response to the call service switchover request, and thus the call service switchover request from the counterpart terminal is changed. You will not be able to respond. In this case, the call service connection between the O-MS 101 and the T-MS 104 is disconnected, so that the user may determine that the call service is interrupted.

Therefore, in the present invention, when the call service switching request is requested between the O-MS 101 and the T-MS 104 at approximately the same time point in time, the priority is set for each call service switching request, and according to the set priority. The call service can be switched to prevent the call service from being interrupted in advance.

3 is a block diagram illustrating a system for call service switching in a mobile communication system according to an embodiment of the present invention.

As shown, in the mobile communication system according to an embodiment of the present invention, the system 200 for the call service switching includes a first exchanger 220 connected to a first terminal 210, a first terminal 210, and a first exchanger. The second exchanger 230 and the second terminal 240 may be included. In the embodiment of the present invention, the first terminal 210 is an originating terminal, the first exchange 220 is an originating exchange, the second exchange 230 is a destination exchange, and the second terminal 240 is an incoming terminal. It will be described with an example.

In addition, in the embodiment of the present invention, when a collision occurs for a call service switch request between the first terminal 210 and the first exchanger 220, a method of resolving the same will be described. This is merely an example to help understanding of the present invention, and the present invention is not limited thereto, and may be similarly applied even when a collision occurs in a call service switch request generated between the second exchanger 230 and the second terminal 240. have. Accordingly, the components 211, 212, 213 of the first terminal 210 and the components 221, 222, 223 of the first exchanger 220 may also be applied to the second terminal 240 and the second exchanger 230. The same may be included.

In addition, since the call service switching request in the embodiment of the present invention is for switching to another call service in the state of being connected through the voice call service or the multimedia call service of the first terminal 210 and the second terminal 240, and the like. The first terminal 210 and the second terminal 240 are connected by using the "SETUP" message and the "CALL CONFIRMED" message indicating the SCUDIF function support by any one of the above-mentioned voice call service or multimedia call service. It can be understood to be a state.

The first terminal 210 transmits a call service switch request request unit 211 for transmitting a call service switch request for switching the call service while the call service is connected to the second terminal 240. The call service switch request transmitted to the call service switch request receiver 212 and the first switch 220 that receives the call service switch request of the second terminal 240 from the first switch 220 through the second switch 230. And a control unit 213 for setting the priority of the call service switching request received from the first exchanger 220 and making the call service switching according to the set priority.

In this case, since the first terminal 210 and the second terminal 240 request a call service switching at a similar time, the case where a collision occurs is described as an example. For example, the case where the call service switch request sent from the first switch 220 to the first terminal 210 and the call service switch request sent from the first switch 220 to the first terminal 210 are transmitted at a similar time will be described. Shall be.

Therefore, the control unit 213 does not receive a response to the call service switch request from the call service switch request unit 211, the call service switch request of the second terminal 240 to the call service switch request receiving unit 212. Since it has been received, it is determined that a collision has occurred in both call service switching requests, and the priority can be set.

In the embodiment of the present invention, a case in which the controller 213 sets the call service switch request received from the first switch 220 to a high priority will be described as an example. This is because the call service switch request received from the first exchange 220 is transmitted while reserving a call path across the second terminal 240, the second exchange 230, and the first exchange 220. In the case of setting the call service switching request to the first switch 220 to the high priority, the call path reserved for the second terminal 240, the second switch 230, and the first switch 220 is set. Because you have to go through the process of restoring, you can go through unnecessary processes.

The first switch 220 receives a call service switch request from the first terminal 210 and a service switch request receiver for receiving a call service switch request from the second terminal 240 through the second switch 230 ( 221, a priority setting unit 222 for setting priorities for call service switching requests received by the service switching request receiving unit 221, and a control unit 223 for making call service switching according to the set priority. It may include.

The priority setting unit 222 may set the priority in the same manner as the priority set in the first terminal 210 described above. This is because the first terminal 210 sets the call service switch request received from the first switch 220 as a high priority, and the priority setter 222 receives the call service switch request received from the first terminal 210. Is set to a high priority, the call service switch request conflict situation can not be resolved.

Accordingly, the priority setting unit 222 may set a high priority to the call service switch request received from the second exchange 230. Accordingly, the first switch 210 ignores the call service switch request received from the first terminal 210 and determines that the call service switch request received from the second switch 230 is valid.

The controller 223 may allow the call service to be switched between the first terminal 210 and the second terminal 240 according to the priority set by the priority setting unit 222.

4 is a flowchart illustrating a call service switching method in a terminal according to an embodiment of the present invention. In this case, FIG. 4 may be understood as an example of setting a call service switch request received from an exchange connected with a terminal to a high priority when a call service switch request collision occurs.

As shown, in the call service switching method in the terminal according to the embodiment of the present invention, the first terminal 210 transmits the call service switching request to the first switch 220 (S110).

At this time, the first terminal 210 does not receive a response to the call service switch request sent in step S110 call service of the second terminal 240 from the first exchange 220 through the second exchange 230. When receiving the switch request (S120), the first terminal 210 determines that a call service switch request collision situation has occurred (S130).

In the exemplary embodiment of the present invention, since the first terminal 210 sets the call service switching request received from the first exchanger 220 to a high priority, the first terminal 210 is S110. Ignoring the call service switch request sent in step S120, setting the call service switch request received in step S120 to a high priority (S140), and performing the call service switch procedure according to the call service switch request received in step S120. It becomes (S150).

In this case, in general, when a call service switch request is received from the second terminal 40, the first terminal 210 may provide a user interface that allows the user of the first terminal 210 to determine whether to switch the call service. In the above-described steps S140 and S150, since the user of the first terminal 210 also requests to switch from the multimedia call service to the voice call service, the first terminal 210 does not provide the user interface as described above. The user of may assume that the call service transfer request has been approved and the service transfer procedure may be performed.

In this case, in the above-described FIG. 4, steps S110 and S120 are sequentially performed. However, this is only an example to help understanding of the present invention and may be performed simultaneously or in reverse order.

5 is a flowchart illustrating a call service switching method in an exchange according to an embodiment of the present invention. In this case, FIG. 5 may be understood as an example of setting a call service switch request received from a counterpart exchange to a high priority when a call service switch request collision occurs.

As shown, the call service switching method in the terminal according to an embodiment of the present invention, the first switch 220, the first switch 220 from the second terminal 240 through the second switch 230. Receives a call service switch request of the (S210), based on this, and transmits a call service switch request to the first terminal 210, and before receiving a response (MODIFY COMPLETE or MODIFY REJECT) to the first terminal 210 When receiving a call service switching request from (S220),

It is determined that the call service switch request conflict situation has occurred (S230).

In the embodiment of the present invention, since the first switch 220 describes a case in which the call service switch request received from the second switch 230 is set to a high priority, the first switch 220 is S210. Ignoring the call service switch request received in step S, the call service switch request received from the second exchange 230 is set to a high priority (S240), and in accordance with the call service switch request received in step S220, call service. The conversion procedure is performed (S250).

In this case, in the aforementioned FIG. 5, steps S210 and S220 are sequentially performed. However, this is only an example to help understanding of the present invention, and may be performed simultaneously or in reverse order.

6 is a flowchart illustrating a method for switching call services in a mobile communication system according to an embodiment of the present invention. 6 illustrates a case where a call service switch request collision occurs between the first terminal 210 and the first exchange 220. For example, the second exchange 230 and the second terminal 240 will be described. The call service switch request collision occurring between the two can be similarly applied. In addition, FIG. 6 illustrates an example in which the call service is switched while the first terminal 210 and the second terminal 240 are connected to the multimedia call service.

As shown, when the user of the second terminal 240 is connected to the multimedia call service and wants to switch to the voice call service, the second terminal 240 includes a "MODIFY" message including information on the call service to be switched. Is transmitted to the second switch 230 (S310), and the radio resource allocation procedure for the voice call service is performed with the second switch 230 (S320).

The second exchange 230 attempts to switch to the voice call service according to the "MODIFY" message transmitted from the second terminal 240, and transmits an "APM" message including information indicating that the multimedia call service is available. 220 is transmitted (S330), the first switch 220 is to transmit a "MODIFY" message based on the "APM" message received from the second switch 230 to the first terminal (210) (S340) ).

At this time, when the user of the first terminal 210 also wants to switch to the voice call service while connected to the multimedia call service, the first terminal 210 sends a "MODIFY" message including information on the call service to be switched. Transmitting to the exchange 220 (S350).

At this time, the first terminal 210 and the first exchanger 220 determines that a call service switch request collision situation has occurred, respectively, and sets priority for each call service switch request accordingly (S360 and S370). . At this time, in the embodiment of the present invention, the first terminal 210 sets the call service switching request transmitted from the first switch 220 to a high priority, and the first switch 220 sets the request from the second switch 230. Since the case in which the transmitted call service switch request is set to a high priority is described by way of example, both the first terminal 210 and the first exchange 220 are connected to the first exchange 220 in the first terminal 210. Disregarding the call service switch request (S350) sent to the process, and only the call service switch request (S340) sent from the first switch 220 to the first terminal 210 is resolved the conflict.

Meanwhile, in general, the first terminal 210 may provide a user interface that allows a user of the first terminal 210 to determine whether to switch the call service when a call service switch request is received from the second terminal 240. In the above-described step S360, since the user of the first terminal 210 also requests to switch from the multimedia call service to the voice call service, the user of the first terminal 210 does not provide the user interface as described above. The service transfer procedure may be performed as if the call service transfer request is approved.

Accordingly, the first terminal 210 transmits a "MODIFY COMPLETE" message to the first switch 220 in response to the "MODIFY" message of step S340 described above (S380), and the radio resource with the first switch 220. The allocation procedure is performed (S390).

Subsequently, when the radio resource of the first terminal 210 is allocated, the first exchange 220 transmits an “APM” message indicating this to the second exchange 230 (S400). The second exchange 230 transmits a "MODIFY COMPLETE" message indicating the completion of switching of the call service to the second terminal 104, so that the call service switching between the first terminal 210 and the second terminal 240 is completed. It may be (S410).

On the other hand, the components or '~' used in this embodiment is software such as tasks, classes, subroutines, processes, objects, execution threads, programs, or FPGAs (field-) that are performed in a predetermined area on the memory. It may be implemented as hardware such as a programmable gate array or an application-specific integrated circuit (ASIC), or may be a combination of the software and hardware. The component or 'unit' may be included in a computer readable storage medium, or a part of the components may be distributed and distributed to a plurality of computers.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains have various permutations, modifications, and modifications without departing from the spirit or essential features of the present invention. It is to be understood that modifications may be made and other embodiments may be embodied. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1 is a block diagram illustrating a mobile communication system according to an embodiment of the present invention.

2 is a flowchart illustrating a call processing method in a mobile communication system according to an embodiment of the present invention.

3 is a block diagram illustrating an apparatus for switching call services in a mobile communication system according to an embodiment of the present invention.

4 is a flowchart illustrating a method of switching a call service in a terminal according to an embodiment of the present invention.

5 is a flowchart illustrating a method of switching a call service in an exchange according to an embodiment of the present invention.

6 is a flowchart illustrating a method for switching call services in a mobile communication system according to an embodiment of the present invention.

Description of the main parts of the drawing

210: first terminal 211: call service switch request transmitting unit

212: call service switch request receiving unit 213: control unit

220: first switch 221: service switch request receiving unit

222: priority setting unit 223: control unit

230: second exchanger 240: second terminal

Claims (17)

A service switch request receiving unit for receiving a call service switch request from a first terminal and a call service switch request from a second terminal connected to the first terminal through a switch connected to the second terminal; A priority setting unit for setting a priority for a call service request from the first terminal and the exchange; And And a control unit for making a call service switch according to the call service switch request according to the set priority. The method of claim 1, And the priority setting unit sets a call service switch request received through the switch to a high priority. The method of claim 2, And the control unit is configured to switch the call service between the first terminal and the second terminal according to the call service switch request set to the high priority. A call service switch request transmitter for transmitting a call service switch request for the call service connected to the counterpart terminal to the exchange; A call service switch request receiving unit which receives a call service switch request from the counterpart terminal from the exchange; And A call service in a mobile communication system including a control unit for setting a priority for a call service switch request sent to the switch and a call service switch request sent from the switch, and for switching the call service according to the set priority. Device for switching. The method of claim 4, wherein And the control unit sets a call service switch request sent from the switch to a high priority. The method of claim 5, The control unit is a device for switching the call service in the mobile communication system to perform a call service switch in accordance with the call service request set to the high priority. The method of claim 6, The control unit determines that the call service switch request from the counterpart terminal is approved, and the apparatus for switching the call service in the mobile communication system omitting the provision of a user interface for approving the call service switch request from the counterpart terminal. . A terminal for setting a priority of the call service switching request sent to the counterpart terminal and the call service switching request sent from the counterpart terminal, and performing the call service switching according to the set priority; And To set the priority of the call service switching request received from the terminal and the call service switching request of the counterpart terminal received from the counterpart exchange connected to the counterpart terminal, and to perform the call service switching according to the set priority. System for call service switching in a mobile communication system comprising an exchange. The method of claim 8, The terminal receives a call service switch request from the counterpart exchange through the exchange, System for call service switching in a mobile communication system that sets a call service switch request received from the exchange at a high priority. The method of claim 9, And the exchange sets the incoming call service transfer request from the counterpart exchange to a high priority. The method of claim 10, The terminal and the switch, the system for the call service switching in the mobile communication system to make the call service switching in accordance with a common call service switching request set to a high priority. The method of claim 8, The terminal determines that the call service switching request from the counterpart terminal is approved, and the system for call service switching in the mobile communication system omitting the provision of a user interface for approving the call service switching request from the counterpart terminal. . Setting a priority of a call service switch request transmitted from the terminal to the counterpart terminal and a call service switch request transmitted from the counterpart terminal, and performing a call service switch according to the set priority; And The exchange sets the priority of the call service switch request received from the terminal and the call service switch request of the counterpart terminal received from the counterpart terminal connected to the counterpart terminal, and the call service switch is performed according to the set priority. Making a call service switch in a mobile communication system. The method of claim 13, The setting of the priority by the terminal may include: receiving, by the terminal, a call service switching request from the counterpart exchange through the exchange; And Setting a call service switch request received from the exchange to a high priority. The method of claim 14, Setting the priority by the exchange comprises setting a received call service transfer request from the counterpart exchange to a high priority. The method of claim 15, The step of allowing the terminal and the exchange to make a call service switch includes the step of causing a call service switch to be made according to a call service switch request set to a high priority in common at the terminal and the switch. And making the call service switch in the mobile communication system. The method of claim 14, The setting of the priority by the terminal may include determining that the call service switch request from the counterpart terminal has been approved and omitting the provision of a user interface for approving the call service switch request from the counterpart terminal. Method for switching the call service in the mobile communication system.

Images