KR20100058689A - Method and system for charging by intelligent network prepayment subscriber in case of voice-video call fallback/service change services - Google Patents

Abstract

PURPOSE: A billing processing method in providing voice-video call change service, and a system thereof are provided, in which the prepaid processing is practiced through the intelligence network system. CONSTITUTION: If the intelligent network pre-paid subscriber is identified based on the subscriber profile of the originating mobile, the mobile switching center(130) transmits the accounting request and voice-image descriptive data with the intelligence network system(190). The incoming call process is proceed. The mobile switching center transmits account data and call forwarding event message with the intelligence network system. The call forwarding processing is proceed. The intelligence network system inquires the balance of subscriber. The incoming permit signal and call processing possible time are offered to the mobile switching center.

Description

Method and system for charging in case of providing voice-video switching service for intelligent network prepaid subscribers {method and system for charging by intelligent network prepayment subscriber in case of voice-video call fallback / service change services}

The present invention relates to billing processing in a mobile communication network system, and more particularly, to a billing processing method and system in processing a voice-video call transfer service.

Due to the recent development of technology, mobile communication networks provide the capability to handle not only voice communication but also multimedia transmission such as transmission of pictures, videos, music and the like. Various protocols for integrating multimedia into mobile communication networks are defined by third generation partnership projectors (3GPP), which are standardized by various standardization bodies in Europe, Japan, Korea, the United States, and China. This protocol can be used in third generation networks according to the UMTS standard as well as in second generation wireless communication networks according to the GSM standard.

In existing protocols, voice or video calls are handled separately. Therefore, in order to transfer a call during a voice and video call, the user had to end the call and attempt to make the call again. To address this inconvenience, the following new features have been incorporated into the 3GPP protocol. That is, the service change and non-restricted digital interface fallback (SCUDIF) function has been added. This SCUDIF provides the capability to switch services during a call connection and to replace it with a single service, i.e. voice or multimedia, in call setup.

The voice-video call switching service function is a function for making a voice or video call without disconnection in a state where a call is established and a call is being made between terminals.

In recent years, the number of subscribers who have subscribed to the prepaid billing system using the intelligent network has increased. The intelligent network prepaid subscriber service is a service that pays a predetermined amount of communication fee in advance and receives a corresponding amount of communication service, which may be characterized as implemented through an intelligent network.

However, when the voice-video call switching service is provided to the intelligent network prepaid subscribers, the charge rates of the voice call and the video call are different, which causes a problem of performing the prepaid billing processing through the intelligent network.

An object of the present invention is to provide a method and system for executing a prepaid billing process through an intelligent network system when providing a voice-video call switching service to intelligent network prepaid subscribers of a mobile communication system. There is this.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.

In order to achieve the above object, the billing processing method when providing a voice-video switching service for an intelligent network prepaid subscriber according to the present invention, when providing a voice-video switching service for an intelligent network prepaid subscriber in a mobile communication system A method of processing charging in real time, the method comprising: (a) receiving an outgoing signal from a mobile station at a mobile switching center, checking a subscriber profile to confirm that the subscriber is an intelligent network prepaid subscriber, and transmitting voice-video attribute information to the intelligent network system together with the charging processing request; Making; (b) inquiring the balance of the subscriber in the intelligent network system and calculating and providing a call grant signal and a call processing time to the mobile switching center; (c) the mobile switching center performing the incoming call processing according to the incoming permission signal to connect the call between the called / calling terminals; (d) when the mobile switching center receives a voice-video call transfer signal from the terminal, transmitting a call transfer event message together with the charging information to the intelligent network system; (e) the intelligent network system performing balance reduction processing based on the received charging information, and calculating and providing a call processing time corresponding to a call transfer permission signal and a converted call to a mobile switching center; And (f) the mobile switching center performing the call transfer process according to the call transfer permission signal to transfer the call call of the called / calling terminal.

According to another aspect of the present invention, a system for processing billing in real time when providing a voice-to-video switching service for an intelligent network prepaid subscriber in a mobile communication system, when the subscriber profile of the calling terminal is inquired to identify the intelligent network prepaid subscriber. Transmit voice-video attribute information with charge processing request to intelligent network system and perform incoming call processing according to response, and upon receiving voice-video call transfer signal from terminal, transmit call transfer event message with charging information to intelligent network system A mobile switching center for performing call transfer processing according to the response; And inquiring the balance of the subscriber according to the billing request of the intelligent network prepaid subscriber, calculating the incoming permission signal and the call processing time as a response to the mobile switching center, and providing the response based on the charging information received according to the call transfer event message. Providing a voice-video switching service for intelligent network prepaid subscribers, including; intelligent network system performing balance reduction processing and calculating and providing a call processing time corresponding to a call transfer permission signal and a switched call to a mobile switching center as a response A billing processing system is provided.

According to the present invention, it provides an effect that can provide a voice-video call switching service to the intelligent network prepaid subscribers in the mobile communication system.

In addition, when providing a voice-video call conversion service to an intelligent network prepaid subscriber, the voice rate and the video rate are distinguished in real time, thereby providing an effect of charging.

In addition, it is possible to generate a separate billing record for each section according to the voice-video call conversion service, thereby providing the effect of separately processing the call history, billing settlement.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a diagram showing the configuration of a mobile communication network system in which the present invention is realized.

As shown in the figure, the prepaid billing system 100 supporting the voice-video conversion service according to an embodiment of the present invention

A plurality of user equipments (UEs) 110 located in a communication area divided and allocated in sector units, a base station (Node B) 121 and a base station 121 which communicate wirelessly with the subscriber station 110. A radio network controller (RNC) 122 for controlling; Mobile switching center 130; Visitor Location Register (VLR) 135; Packet switch 131; IP network (or IP backbone network) 140; A Home Location Register (HLR) 150 and an Intelligent Network 190.

The subscriber station 110 is a terminal using a mobile communication service through a circuit switched network (CSN) and a packet switched network (PSN), and performs voice, video call, short message (SMS) and multimedia message (MMS) services. Functions and software must be loaded to enable support. Subscriber terminal 110 according to the present invention includes a cellular phone, a PCS (Personal Communication Service) phone, PDA phone, GSM phone, CDMA-2000 phone, WCDMA phone, DMB phone, etc., in particular, preferably WCDMA phone.

A random access network (RAN) 120 serves to guarantee the mobility of the subscriber station 110 and performs hand-off and radio resource management functions. The radio access network 120 includes a base station 121 and a radio control station 122 to configure an access network for connecting the subscriber station 110 to a core network or a packet connection. .

The base station (Node B) 121 performs a radio access termination function with a subscriber station conforming to the 3GPP radio access standard, and in particular, performs a function of transmitting and receiving voice, video, and data traffic in a WCDMA manner. . The RLC 122 is capable of managing wired and wireless channels, protocol matching with subscriber stations, protocol matching between base stations, soft handoff processing, core network protocol processing, GPRS (General Packet Radio Service) access, and fault management. , Functions such as system loading. Here, GPRS is an asynchronous communication system that supports a data transmission speed of 115kbps, provides a multimedia mail, and maximizes the efficiency of a transmission line by packet data transmission.

The mobile switching center 130 has a soft switching structure for speeding up call processing in addition to basic functions for voice call in the existing IS-95B network. Here, soft switching is a technology capable of processing voice, data, and video signals with a high speed packet switch by upgrading a circuit switch of a conventional exchange to a software switch.

In particular, the mobile switching center 130 distinguishes between intelligent service prepaid subscribers and additional service subscribers such as voice-video call transfer service subscribers in circuit switching and call processing. In this case, the subscriber profile information provided from the location register 150 stored in the visitor location register 135 is used. In addition, the mobile switching center 130 performs service processing and voice-video call switching service processing for the intelligent network prepaid subscriber in association with the intelligent network system 190. To this end, the mobile switching center 130 provides voice-video attribute information to the intelligent network system 190. Through the voice-video attribute information, the intelligent network system 190 may check information on voice and video calls and rate information.

In addition, the mobile switching station 130 transmits an event message to the intelligent network system 190 as an event message when an event such as call reception, call transfer, and call termination occurs from the terminal according to a voice-video call switching service. To perform. In addition, when the service is processed for the prepaid subscriber in association with the intelligent network system 190, an incoming process, a call transfer process, and a call termination process are performed according to the response from the intelligent network system 190. Further, control processing is performed to set or limit a call of the terminal according to a call processing time available from the intelligent network system 190 and a call processing permission signal. For example, if a time elapses after the call is connected and the available call processing time is exceeded (balance exhaustion), control is performed such as limiting the call.

In the case of the present invention, the mobile switching center 130 receives the subscriber profile information (voice-video call transfer service information and intelligent network information) of the calling terminal from the home location register 150 at the time of registering the location of the calling terminal. It is stored and managed in the register 135. Therefore, when an outgoing call is received from the originating terminal 110, the mobile switching center 130 based on the intelligent network information (service key) of the subscriber profile stored in the visitor location register (VLR) 135, the corresponding intelligent network system. (In particular, SCP) 190, and checks the service authority (e.g., balance information and call processing time information, etc.) of the calling subscriber.

The visitor location register (VLR) 135 registers and manages location information of the subscriber station 110 coming into the jurisdiction of the mobile switching center 130 and stores the newly acquired location information of the subscriber station in the home location register 150. It performs the function of notifying by. In addition, while taking over and managing a copy of the profile information of the subscriber station 110 received from the home location register 150, the function of utilizing the location control, call processing, additional service processing of the subscriber station 110, etc. Perform. Here, the profile information refers to a mobile identification number (MIN), an electric serial number (ESN), an additional service (voice-video call switching service, intelligent network prepaid service) information, and intelligent network information of the subscriber station.

The packet switch (SGSN) 131 has a hardware structure for providing an Asynchronous Transfer Mode (ATM) -based switch and routing connection for a GPRS service, and supports an operating system (OS) according to various data service processing. do. The operating system functions consist of GPRS mobility management, GPRS session management, GPRS authentication and billing functions.

The home location register (HLR) 150 receives, stores and manages a subscriber profile such as an intelligent network information (ServiceKey) and additional service information about a subscriber from a customer management database system (WISE). Therefore, the response message for the location registration request of the originating terminal includes the intelligent network information (ServiceKey) and the additional service information is transmitted to the mobile switching center (or packet switch) (130).

The intelligent network system 190 refers to equipment capable of generating and processing a service desired by a service provider. The network elements of the intelligent network include an SSP (Service Switching Point), which is a switching device, and a SCP (Service Control Point), which is a service control device. ), A Service Management System (SMS) as a service management device, Intelligent Peripheral (IP) as an intelligent peripheral device, and a Service Creation Environment (SCE) as a service development environment for creating and providing service logic. In the intelligent network system 190, all systems are linked to a network, and SMS processes multiple subscriber information of a customer management database system (WISE: Wireless Information Service Environment) in an environment requiring real-time work processing. Instructs SCP to process the job and sends the results of the series of job processing back to the customer care database system.

In accordance with the present invention, the intelligent network system 190, in particular, the SCP, according to the originating subscriber's prepaid billing processing inquiry and authorization request from the mobile switching center (or packet switch) 130, provides information on the incoming authority and call processing time. Answer. In addition, SCP retrieves the charging information for the prepaid subscriber from the intelligent network information database (not shown), calculates the charging information (balance information, rate information, etc.) for the retrieved prepaid subscriber, and the result is the mobile switching center 130 ) To send to. That is, SCP 190 inquires the balance information of the prepaid subscriber, and if the balance is sufficient, transmits an incoming call permission signal to the mobile switching center 130, and can process the call according to the rate of the provided voice-video attribute information. Calculate and provide it as a response. Therefore, the intelligent network system 190 performs a real-time deduction process based on the balance information and the rate information.

In addition, the intelligent network system 190 performs the prepaid billing process again according to the event message transmitted from the mobile switching center 130. That is, for example, when a call transfer event message is received, a call processing time is recalculated and provided according to a rate according to a call (voice call or video call) to be switched, and the subtraction process is set again according to the rate.

In the above-described system of the present invention, the case where the incoming and outgoing subscribers are all WCDMA subscribers and the mobile communication network is a CDMA network is described as a representative embodiment. However, the system of the present invention is not necessarily limited to such a system.

That is, the system of the present invention is the same even when the mobile communication network is a WCDMA network and at least one of the incoming and outgoing subscribers is another protocol subscriber roaming to the WCDMA network (for example, CDMA-2000, CDMA, GSM, etc.). Can be applied.

2 is a diagram illustrating a billing processing procedure for providing a voice-video switching service for an intelligent network prepaid subscriber according to an embodiment of the present invention for each node.

With reference to FIG. 2, a charging processing method when providing a voice-video switching service for an intelligent network prepaid subscriber according to an embodiment of the present invention will be described.

First, as shown in the figure, the terminal attempts to make a call to the mobile switching center. It is assumed that the terminal is an intelligent network prepaid subscriber and a voice-video call switching service subscriber.

The mobile switching center checks the subscriber profile of the calling terminal. At this time, the subscriber profile is copied from the home location register and stored in the visitor location register. As a result of the subscriber profile check, the calling terminal confirms that it is an intelligent network prepaid subscriber and a subscriber of voice-video call switching service.

The mobile switching center determines that the intelligent network is a prepaid subscriber and performs routing processing to the intelligent network system through the routing information included in the intelligent network information. Along with this routing process, a procedure for transmitting a billing processing request and voice-video attribute information for the corresponding subscriber station is performed.

In the intelligent network system, a procedure for inquiring a prepaid balance of a corresponding subscriber station is performed on request. As a result of the balance inquiry, it is determined that a call can be received when a balance exists. If a balance is insufficient, it is determined that a call cannot be received.

In addition, in the intelligent network system, a procedure for calculating a call processing time of a corresponding subscriber station is performed according to voice-video attribute information. That is, the time available to talk with the current balance is calculated based on the rate information included in the attribute information. In this case, the rate will vary according to the voice call and the video call included in the attribute information, and the rate may also vary according to the service subscribed to by the subscriber.

The mobile switching center receives the authorization information and the call processing time information from the intelligent network system and performs the incoming call processing accordingly. In this case, if the incoming call is possible, if the incoming call is impossible, the call processing procedure is provided to the calling terminal and a procedure for limiting the call is performed.

In the terminal, a call is connected to the called terminal and the call is processed according to the incoming call processing of the mobile switching center. Of course, when an incoming call is received by the called terminal, a call channel and a session are connected to make a call.

In the terminal, a subscriber attempts to transfer a call according to a voice-video call switching service during a call. Accordingly, the terminal transmits a call transfer request signal to the mobile switching center.

When the mobile switching center receives the call transfer request signal, the mobile switching center transmits a call transfer event message to the intelligent network system. In addition, billing information on the call so far is transmitted.

The intelligent network system receives the event message and the billing information, and performs a subtraction process on the subscriber's prepaid balance.

After the balance reduction process, the intelligent network system calculates the call processing time by applying the rate for the call and provides it to the mobile switching center. In this case, the call transfer permission signal is transmitted together with the remaining balance.

The mobile switching center performs call transfer processing in accordance with the call transfer permission signal. In this case, the call transfer permission signal may be applied. If the call transfer disable signal is received, call transfer may be restricted.

According to the call switching process at the mobile switching center, the terminal is connected to the called terminal by the switched call. That is, the video call is switched during the voice call, or the voice call is switched during the video call.

Next, the terminal terminates the call after the call occurs in the terminal. Accordingly, the terminal transmits a call termination signal to the mobile switching center.

When the mobile switching center receives the call termination signal, it transmits a call termination event message to the intelligent network system. In addition, billing information on the call so far is transmitted.

The intelligent network system receives the event message and the billing information and performs a subtraction process on the subscriber's prepaid balance.

After balance deduction processing, the intelligent network system provides the prepaid accounting result information to the mobile switching center.

In addition, the mobile switching center performs call termination processing to release a channel and a session between the corresponding terminal and the called terminal.

In accordance with the call termination processing at the mobile switching center, the terminal terminates the call and releases the call with the called terminal.

In addition to the call termination processing, the mobile switching center generates a prepaid service billing data (CDR) according to the prepaid billing result information received from the intelligent network system. Through this, currency history and billing settlement can be handled separately. (37)

3 is a diagram showing an embodiment of the prepaid billing process of the present invention performed in a WCDMA system.

3, a specific embodiment of the present invention will be described in a WCDMA system environment. This embodiment assumes a situation in which a terminal makes a voice call and switches to a video call in accordance with a voice-video call switching service.

First, the MSC sends an IDP (Initial Detection Point) message to the intelligent network SCP according to the D-CSI (INRN) assigned to the originating intelligent network subscriber. In the IDP message, service key information of an intelligent network prepaid service and BC (bearer capability) corresponding to voice and BC corresponding to video in the case of a voice-video call transfer call are simultaneously delivered. Here, the parameter included in the IDP message, for example, if the Ext-BasicServiceCode value is H'11 to perform the voice call processing scenario.

The SCP sends a Call Information Request (CIRQ) message from the called party to the MSC requesting call processing time to process prepaid charges. Transmit both Leg1 and Leg2, the parameters used in the CIRQ message. In addition, the SCP sends the call processing time to an AC (Apply Charging) message according to the prepaid balance, which causes the MSC to perform the call processing for that time. In addition, a request report BCSM event (RRBE) message is transmitted to set an event required for an event processing report generated during call processing to the exchange. At this time, 'Service_Change DP' for reporting the voice-video call switching service event is transmitted. In addition, SCP assigns the called number to the 'Connect' message and sends it to the MSC to perform incoming call processing. (52)

The MSC receives the above messages and performs incoming call processing accordingly. When an incoming call is processed and the called terminal answers, the call is connected. (53, 54)

The MSC sends an ERB (O_Answer) message (Event Request BCSM Message) to the SCP when the called party responds. In addition, the MSC transmits an ACR message after 'CallDuration' after the called terminal responds. From this point on, SCP will apply the rate for voice calls when charging. (55,56)

After receiving the ACR message, SCP sends an AC message to the MSC if the subscriber balance is sufficient. After receiving the AC message, the MSC sends the ACR message after the AC transmission cycle. In addition, when the tone is 'True', the MSC transmits the tone before a predetermined exhaustion time (eg, 30 seconds). In addition, if the call connection time is delayed, it repeats the AC / ACR message transmission procedure.

Then, when a call-to-video call transfer occurs in the MSC, the video call transfer process is performed and an event about the call transfer to the intelligent network SCP is transmitted as an ERB (O_Service_Change) message. (58, 59)

At this time, the MSC transmits the voice call processing billing data used until the call transfer to the SCP as an ACR message. SCP calculates the amount of money by using voice rate for the amount used up to this point. (60)

Based on the received ERB message and ACR message, SCP calculates the charge for the voice call processing used so far, performs the balance deduction processing, and sends the deduction result to the MSC as an FCI message. (61)

In addition, the SCP calculates the available time from the available amount and sends it as an AC message to the MSC in order to continue the call processing for the converted new video call. (62)

After that, if the video call processing continues, the ACR and AC message transmission procedures are repeatedly performed. (63, 64)

Next, when the terminal releases the call, the MSC performs call release processing between the terminals, and transmits a call termination message to the SCP as an ERB (O_Disconnect) message. (65, 66)

In addition, billing information for the video call processing used up to this point is transmitted to the SCP as an ACR message. SCP uses the video rate to calculate the amount of money spent up to this point. In addition, CIRP (Leg1, Leg2) messages are also sent to SCP (67, 68).

In addition, even when call repetition occurs repeatedly, the prepaid charging process in the intelligent network can be performed by repeating the same procedure as described above.

Based on the received ERB and ACR messages, SCP calculates and deducts the charge for the video call processing used so far, and sends the deduction result to the MSC as an FCI message. (69)

Afterwards, SCP sends a 'Release' message to MSC to terminate call processing. (70)

Accordingly, the MSC terminates the dialog for the call. After the end of the call, the MSC generates the billing data (CDR) for prepaid service.

Although the invention has been described above by means of limited embodiments and drawings, the invention is not limited thereto and will be described below by the person skilled in the art and the technical spirit of the invention. Of course, various modifications and variations are possible within the scope of the claims.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a diagram showing the configuration of a mobile communication network system in which the present invention is realized.

2 is a diagram illustrating a billing processing procedure for providing a voice-video switching service for an intelligent network prepaid subscriber according to an embodiment of the present invention for each node.

3 is a diagram showing an embodiment of the prepaid billing process of the present invention performed in a WCDMA system.

<Explanation of symbols for the main parts of the drawings>

110: mobile communication terminal (UE) 121: base station (Node B)

122: radio control station (RNC) 130: mobile switching center (MSC)

150: home location register (HLR) 190: intelligent network system (SCP)

Claims (14)

A method of processing charging in real time when providing a voice-video conversion service for an intelligent network prepaid subscriber in a mobile communication system, (a) receiving an outgoing call from a mobile station at the mobile switching center, checking a subscriber profile to confirm that the intelligent network is a prepaid subscriber, and transmitting voice-video attribute information to the intelligent network system together with a billing request; (b) inquiring the balance of the corresponding subscriber in the intelligent network system and calculating and providing the incoming permission signal and the call processing time to the mobile switching center; (c) the mobile switching center performing the incoming call processing according to the incoming permission signal to connect the call between the called / calling terminals; (d) when the mobile switching center receives a voice-video call transfer signal from the terminal, transmitting a call transfer event message together with the charging information to the intelligent network system; (e) the intelligent network system performing balance reduction processing based on the received charging information, and calculating and providing a call processing time corresponding to a call transfer permission signal and a converted call to a mobile switching center; And (f) the mobile switching center performing the call transfer processing according to the call transfer permission signal to transfer the call of the called / originating terminal; charging processing at the time of providing the voice-video switching service to the intelligent network prepaid subscriber; Way. The method of claim 1, After the step (f), (g) the mobile switching center, when the call termination signal is received from the terminal, transmitting a call termination event message together with the charging information to the intelligent network system; And (h) the intelligent network system performing a balance deduction processing based on the received charging information; billing processing method at the time of providing a voice-video switching service for an intelligent network prepaid subscriber. The method according to claim 1 or 2, Step (b) is, When the balance of the subscriber is inquired by the intelligent network system, if the balance is insufficient, the charge exchange processing method for providing the voice-video switching service for the intelligent network prepaid subscriber, characterized in that the signal for the incoming call to the mobile switching center. The method according to claim 1 or 2, In step (c) to step (f), And the mobile switching center releases the call when the call processing time is exhausted due to the passage of time after connection between the call calls between the terminals. The method according to claim 1 or 2, In step (b) and step (e), And the intelligent network system calculates a call processing time based on rate information included in voice-video attribute information received from a mobile switching center. The method according to claim 1 or 2, The subscriber profile includes intelligent network prepaid subscriber information and voice-video switching service subscriber information, and is stored in a home location register. The method according to claim 1 or 2, The information transfer message transmitted between the mobile switching center and the intelligent network system uses an IDP (Initial DP) message and an ERB (EventReportBCSM) message. The method of claim 2, After step (h), (i) The mobile switching center further comprises the step of receiving a balance deduction result from the intelligent network system to generate a chargeable data (CDR) for the prepaid service. Treatment method. A system for processing charging in real time when providing a voice-video conversion service for an intelligent network prepaid subscriber in a mobile communication system, When the subscriber profile of the calling terminal is inquired and confirmed to be an intelligent network prepaid subscriber, the voice network transmits the voice-video attribute information along with the charge processing request, performs the incoming call processing according to the response, and receives the voice-video call switching signal from the terminal. A mobile switching center that, upon receipt, transmits a call transfer event message to the intelligent network system together with the charging information and performs a call transfer process according to the response; And According to the billing request of the intelligent network prepaid subscriber, the balance of the subscriber is inquired and the incoming exchange signal and the call processing time are calculated and provided to the mobile switching center as a response, and the balance is based on the charging information received according to the call transfer event message. An intelligent network system that performs subtraction processing and calculates a call processing time corresponding to a call transfer permission signal and a converted call to a mobile switching center and provides the response as an answer. Billing processing system. The method of claim 9, When the call termination signal is received from the mobile station, the mobile switching center transmits a call termination event message together with the charging information to the intelligent network system. And the intelligent network system performs a balance deduction processing based on the charging information received according to a call termination event message. 11. The method according to claim 9 or 10, The intelligent network system inquires the subscriber's balance and provides a signal for not receiving a call to the mobile switching center when the balance is insufficient as a response. 11. The method according to claim 9 or 10, The mobile switching center provides a voice-video switching service for an intelligent network prepaid subscriber when the call processing time received from the intelligent network system is exhausted due to the passage of time during the call connection between terminals. City's billing processing system. 11. The method according to claim 9 or 10, The intelligent network system calculates a call processing time according to the rate information included in the voice-video attribute information received by the mobile switching center. . 11. The method according to claim 9 or 10, An intelligent network prepaid subscriber, which stores and manages a subscriber profile including intelligent network prepaid subscriber information and voice-video switching service subscriber information, and provides a subscriber profile in response to an inquiry request from the mobile switching center. Billing processing system when providing a voice-video conversion service for.

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