KR20030059699A - Method for answering voice call during data service in mobile telecommunication system - Google Patents

Abstract

PURPOSE: A method for terminating a voice call during data service in a mobile system is provided to transit an MS(Mobile Station) into a data dormant state in the case of a terminating call attempt in the middle of data service. CONSTITUTION: The MSC(Mobile Switching Center) handling the data service of an MS judges whether the voice call terminating service of the MS is in an active state if another MSC calls the MS for a voice terminating call while the MS is executing data service. If the voice call terminating service is active, the MSC transmits a FlashWithInfo message to the MS for the state transition of the MS. Receiving the FlashWithInfo message, the MS informs the user that the present data service will be held. Then, if the MS informs the BS(Base Station) that the transition into a dormant state is required, the BS reports it to the MSC. If the MSC approves the state transition of the MS, the BS deletes state information used in the data service, directs the MS to delete the state information, and informs the MSC that the state transition of the MS has been completed. In response to it, the MS deletes the state information and transits into the dormant state.

Description

How to receive voice call during data service in mobile communication system {METHOD FOR ANSWERING VOICE CALL DURING DATA SERVICE IN MOBILE TELECOMMUNICATION SYSTEM}

The present invention relates to a mobile communication system, and more particularly, to a method for responding to a voice call incoming attempt during a data service of a mobile terminal in a mobile communication system supporting both a voice service and a data service.

Mobile communication systems such as Code Division Multiple Access (CDMA) 2000, Wideband Code Division Multiple Access / Universal Mobile Telecommunications System (WCDMA / UMTS), General Packet Radio System (GPRS), and CDMA2000 1xEV-DV (Evolution Data and Voice) Includes a base station controller (BSC) and a base transceiver system (BTS).

Such a mobile communication system typically provided only a voice service to a mobile subscriber, but recently supports a high speed packet data service and a video communication as well as a voice service. A base station in data service allocates at least one traffic channel to a mobile station (MS) and transmits a data packet.

With the development of mobile communication technology, high-speed data communication is possible and stable transmission of packets has been ensured. Accordingly, mobile data service has been gradually activated. However, such data service occupies a long time traffic channel due to its characteristics. In this case, when a voice incoming call is attempted to the mobile terminal in the data service, a call (data call) for the data service is in progress and the system determines that it is a called party busy state and cannot receive the voice call. Therefore, there was a problem that the important voice call was not received for a long time during the data service.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a method for receiving a voice call and performing voice communication among data services in a mobile communication system.

Another object of the present invention is to provide a method for transitioning a mobile terminal to a data dormant state in a system when an incoming call is attempted during a data service.

Another object of the present invention is to provide a method for requesting an incoming call of a voice call to a mobile terminal transitioned to a data dormant state.

Another object of the present invention is a method for resetting a session for a data service by attempting to originate a data call to a mobile terminal which terminates a voice call in a data doping state.

In order to achieve the above object, the present invention provides a voice call to a mobile terminal while the mobile switching center provides a data service to the mobile terminal through a base station system in a mobile communication system supporting voice and data services. In the method for incoming calls,

Instructing the mobile terminal to transition to a data dormant state when a voice call is attempted to the mobile terminal while providing a data service to the mobile terminal;

When the mobile terminal transitions to the data dormant state, transmitting an incoming call message to the mobile terminal;

And when the call response message is received from the mobile terminal, connecting the voice incoming call to the mobile terminal.

1 is a view showing a network configuration of a mobile communication system to which the present invention is applied.

2 is a diagram showing the configuration of a base station controller (BSC) shown in FIG.

3 is a diagram showing the configuration of a base station transceiver (BTS) shown in FIG.

4 is a view showing the configuration of the channel cards shown in FIG.

5 is a flowchart illustrating a voice call incoming service activation operation according to the present invention;

6 is a flowchart illustrating an operation of initiating a data service between a mobile terminal and a mobile communication system.

7 is a flowchart illustrating an operation of receiving a voice call in a data service according to the present invention.

8 is a flowchart illustrating an operation of restarting a data service according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

According to the present invention, when a voice call is requested from a mobile terminal in data service, the mobile terminal transitions to a data dormant state, connects a voice call, and resets the data session when the voice call ends. For restarting the data service.

1 is a diagram illustrating a network configuration of a mobile communication system to which the present invention is applied. The mobile communication system supports not only voice services but also packet services to mobile subscribers. The structure shown in FIG. 1 is a generalization of the structure of a mobile communication system, and the names of the components indicate which system (eg, IS-2000, WCDMA, UMTS, CDMA2000 1xEV-DV, GPRS, etc.) of the mobile communication system. It can vary depending on whether

Referring to FIG. 1, a mobile communication system is a base station wirelessly connected to and communicates with mobile terminals 10, 11 and 12, which are subscribers, through the wireless channel. Transceivers (BTSs) 20 and 21, and base station controllers (BSC) 30 connected in wired communication with the base station transceivers 20 and 21. The base station transceivers 20 and 21 and the base station controller 30 are collectively called a base station (BS).

The base station controller 30 is connected to a mobile switching center (MSC) 40. The mobile switching center 40 is a packet switched network such as a circuit network such as a public switched telephone network (PSTN) and an Internet / Packet Switched Data Network (PSDN). Connected to a switched network). At this time, the mobile terminal 10, 11, 12 is provided with a voice service or a data service under the control of the base station controller 30.

The mobile switching center 40 has a subscriber database therein called the Visitor Location Register (VLR) 41. The visitor location register 41 manages the authority and activation of services provided to mobile terminal subscribers roaming in its service area under the direction of the Home Location Register (HLR) 50, and manages this information. The home location register 50 is a subscriber database for all mobile subscribers subscribed to the mobile communication service. The home location register 50 manages authority and activation of basic services and various additional services. In particular, the home location register 50 stores information indicating whether the voice call service according to the present invention is authorized and activated. This information is provided to the visitor locator 41 at the request of the visitor locator 41.

2 is a diagram illustrating a configuration of a base station controller (BSC) 30 shown in FIG. 1.

Referring to FIG. 2, the base station controller 30 includes a main controller 310, a line interface (or network interface) 320, an intra-BSC switch or router 330, and a line interface. (Line Interface) 340. The main controller 310 generally controls the base station controller 30. The line interface 320 is for connection with the mobile switching center 40, and the line interface 340 is for connection with the base station 20. The switch 330 routes the traffic in the base station controller 30. The Selection & Distribution Unit (SDU) processor 350 multiplexes / demultiplexes traffic transmitted and received from two or more links during soft handover. The RLP processor 350 supports error recovery of a radio link.

3 is a diagram illustrating a configuration of a base station transceiver (BTS) 20, 21 shown in FIG. It is assumed here that the base station is the base station 20 of FIG. 1, but the same applies to the other base station 21.

Referring to FIG. 3, the base station 20 includes a main processor 210, a line interface 220, an intra-BTS switch or router 230, and channel cards 241. 243, radio frequency (hereinafter referred to as RF) and a transmitter / receiver 250. The master controller 210 generally controls the base station 20. The line interface 220 is for connection with the base station controller 40. The RF transceiver 250 is for transmitting and receiving data and control signals in the form of a radio signal (RF signal) between the mobile terminal 10. The switch 230 determines the traffic path within the base station.

FIG. 4 is a diagram showing the configuration of channel cards 241 to 243 shown in FIG. This configuration will be assumed to be channel card 241, but the same applies to the other channel cards 242 to 243.

Referring to FIG. 4, the channel card 241 includes an input / output interface 24-1, a main processor 24-2, a memory 24-3, and at least one modulator 24. -4 and at least one demodulator 24-5. The input / output interface 24-1 is for connection with the switch 230. The modulator 24-4 modulates data and control signals to be transmitted to the mobile terminal 10 through the transmitter 251 of the RF transceiver 250. The demodulators 24-5 demodulate data and control signals received from the mobile terminal 10 through the receiver 252 of the RF transceiver 250. The modulators 24-4 and demodulators 24-5 are also referred to as channel elements (CEs) in that they each serve one forward or reverse channel. The memory 24-3 includes an internal buffer (buffer 22 of FIG. 2) that temporarily receives packet data to be transmitted to the mobile terminal 10 from the base station controller 40. In addition, the memory 24-3 may store various control information.

1 to 4 illustrate a configuration of a mobile communication system suitable for providing a packet data service. Since packet data service requires long-term channel occupancy and various control such as data transmission rate, it is necessary to define various states according to channel allocation status and status information in mobile communication system. This will be described in detail as follows.

Packet data service includes Packet Null State, Initialization State, Active State, Control Hold State, Suspended State, Dormant State It may have a reconnect state. Among these, the control holding state, the operating state, and the standby state maintain a service option (data call or voice call) designated at the initial call setup, and the remaining states do not maintain the service option.

When a packet service request is generated in the packet null state, the packet service request transitions to an initial state and attempts to connect a packet service. In this state, if the dedicated control channel is set, the control state transitions to the maintenance hold state. The dedicated control channel is used to carry three-layer messages and MAC (Media Access Control) messages. After the transition to the operating state, forward and reverse dedicated control channels and traffic channels are maintained, and RLP (Radio Link Protocol) frames are exchanged between the base station and the base station controller through the channels. At this time, in order to efficiently use the radio resources and reduce power consumption of the mobile terminal, the packet service transitions to the standby state when a relatively short inactivity time occurs.

Dedicated channels (control channels and traffic channels) are released when the standby state. Since both the base station and the mobile station maintain state information including RLP initialization, traffic channel configuration, encryption parameters, etc., the dedicated control channel and the dedicated traffic channels can be allocated relatively quickly. When there is no data exchange for a predetermined time in the standby state, the state transitions to the doping state.

Only the Point-to-Point Protocol (PPP) connection is maintained in the doping state. When data to be sent in the dormant state is generated, the state transitions to the reconnection state, and when the dedicated control channel is set, the control state is entered. The mobile station monitors the call channel and the forward shared channel while the shared channel is in use, such as the standby, dormant, and reconnect state, and the base station monitors the access channel and the reverse shared channel.

Hereinafter, an operation example of the present invention will be described in detail by exchanging messages in the mobile terminal, the base station, the mobile switching station, the visitor location register, and the home location registration period. The names, types, and formats of the messages described below are based on IS-41C Basic Feature Processing (CELLULAR RADIO TELECOMMUNICATIONS INTERSYSTEM OPERATIONS, IS-41C).

5 is a flowchart illustrating a voice call incoming service activation operation according to the present invention. That is, the service provider assigns a service activation feature code to each additional service that can be designated by the user. The user can activate or deactivate the additional service using the feature code. The feature code for activating the voice call terminating service according to the present invention is, for example, "* 81", and the feature code for deactivating is, for example, "* 810".

Referring to FIG. 5, a user dials a feature code "81" (or "810") for activating (or deactivating) a voice call terminating service by operating a keypad of a mobile terminal (MS). The feature code is included in a feature code string of a feature request message and transmitted to a mobile switching center (MSC) through a base station (BS). The MS then transmits a Feature Request Operation message requesting activation (or deactivation) of the voice call terminating service to the home location register (HLR) to which the mobile terminal is subscribed.

The home location register interprets the feature code string included in the Feature Request Operation message and records whether the service is activated or deactivated in the subscriber database when the subscriber is authorized to use the voice call termination service. At this time, although not shown, the home location register transmits a Qualification Directive Operation message to inform the visitor location register (VLR) in the mobile switching station that the service activation is changed, and transmits a Feature Request Return message to the mobile switching center. The mobile switching center transmits a feature request message including a feature request result included in the feature request return message to the mobile terminal through the base station. The mobile terminal sends a confirmation tone to inform the user that the activation of the voice call termination service has changed.

6 is a flowchart illustrating an operation of starting a data service between a mobile terminal and a mobile communication system. In this case, it is assumed that the visitor exchange in the mobile switching center has already received and stored the subscriber profile of the mobile terminal requesting the origination of the data call from the home location register.

Referring to FIG. 6, the mobile station transmits an origination message in which the service option is set to the data call to the base station to request the origination of the data call. The base station then sends a CM (Connection Management) ServiceRequest message with the service option set to the data call to the mobile switching center. The mobile switching center requests and obtains a subscriber profile of the mobile terminal from the visitor location register, and instructs the base station to proceed with the originating request of the mobile terminal if the obtained subscriber profile is justified. The base station then allocates a traffic channel for a data service with the mobile terminal. (AssignmentRequest, ChannelAssignment)

Thereafter, the mobile terminal performs a PPP negotiation with a packet network through the assigned traffic channel to create a data session for a data service. When the creation of the data session is completed, the base station reports to the mobile switching station that the allocation of the traffic channel is completed (AssignmentComplete). Thus, when a connection is established between the base station and the mobile switching station (Connect), the data service of the mobile terminal is started. do.

7 is a flowchart illustrating an operation of receiving a voice call in a data service according to the present invention. Here, the other switching station shown in FIG. 7 means an switching station that handles any origination call for the mobile terminal in data service.

Referring to FIG. 7, when another switching station calls the mobile terminal for a voice call while the mobile terminal is performing data service, the mobile switching station processing the data service of the mobile terminal receives the voice call receiving service of the mobile terminal. Determine if is active. If not activated, the other switching center is notified that the mobile terminal is busy.

On the other hand, if the voice call terminating service of the mobile terminal is activated, the mobile switching center transmits a FlashWithInfo message to indicate the state transition of the mobile terminal to the mobile terminal through a base station. As defined in IS634, the FlashWithInfo message has a field indicating a state transition of the mobile terminal. Accordingly, the state transition of the mobile terminal can be indicated by transmitting the field by setting a type value (Pkt_Dormant_Transition) to indicate the transition to the dormant state. The field indicating the state transition may include 'IS95 Information Record Type' and 'PN-4431 (TIA / EIA / IS2000.5) Information Record Types' according to the mobile communication standard.

After receiving the FlashWithInfo message, the mobile station informs that a data service currently in progress is suspended on a screen or voice. For example, the mobile terminal displays "a data call is held with a voice incoming call."

Then, when the mobile station reports to the base station that the transition to the dormant state (Release Order), the base station notifies the mobile switching station. (ClearRequest) If the mobile switching station approves the state transition of the mobile terminal, ( ClearCommand) The base station deletes the state information used to proceed with the data service and instructs the mobile terminal to delete the state information (Release Order) and reports to the mobile switching center that the state transition of the mobile terminal is completed. In response, the mobile station deletes the state information and transitions to the dormant state.

When the state transition of the mobile terminal is completed, the mobile switching center transmits a PageRequest message for calling the mobile terminal through the base station. Here, the service option of the PageRequest message is set to voice. When the mobile terminal sends a PageResponse message to the mobile switching center in response to the call, the mobile switching station instructs the base station to allocate a channel. (AssignmentRequest) The base station then makes a voice call with the mobile terminal. Allocate a traffic channel for the channel (ChannelAssignment) and report to the mobile exchange that the channel has been allocated. (AssignmentComplete)

After the allocation of the traffic channel is completed through the above procedure, when the base station transmits an AlertWithInfo message to the mobile terminal, the mobile terminal transmits an MS Ack Order message to the base station through the assigned traffic channel so that the traffic channel is normally Check if it is assigned. When the user of the mobile terminal receives an incoming call, the mobile terminal transmits a Connect Order message to the base station, and the base station confirms this with a BS Ack Order message. Thereafter, the base station notifies the mobile switching center that the voice call connection is connected, and when the mobile switching center transmits a called party response to the calling party in response, a voice call is made between the mobile terminal and the calling party.

8 is a flowchart illustrating an operation of resuming the data service after the voice incoming call is terminated in the mobile terminal in which the voice incoming call is established by transitioning to a data dome state among data services according to the present invention. 8 illustrates a call termination request procedure by the calling party, of course, the same procedure is performed when the call termination request is made by the called party.

Referring to FIG. 8, when a call disconnection is requested from an originating exchange during a voice call by transitioning to a data dormant state during a data service, the mobile switching station requests a base station to terminate the voice call. The base station transmits a Release Order message to the mobile terminal. Then, the mobile terminal terminates the voice call, releases the traffic channel, and informs the base station of the release order message. The base station sends a ClearComplete message to the mobile switching center to report that the voice call connection of the mobile terminal has been released.

Thereafter, the mobile station automatically transmits an origination message for the data service call origination to the base station. Here, the service option of the Origination message is set to a data call. The base station then sends a CMServiceRequest message with the service option set to the data call to the mobile switching center. The mobile switching station acquires the subscriber profile of the mobile terminal from the visitor location register as in the initial call setup, and instructs the base station to proceed with the originating request of the mobile terminal if the obtained subscriber profile is justified. The base station then allocates a traffic channel for a data service with the mobile terminal. (AssignmentRequest, ChannelAssignment)

Thereafter, the mobile terminal performs a PPP negotiation with a packet network through the assigned traffic channel to reset a data session for a data service. When the resetting of the data session is completed, the base station reports to the mobile switching station that the allocation of the traffic channel is completed (AssignmentComplete). Thus, when a connection is established between the base station and the mobile switching station (Connect), the data service of the mobile terminal is connected. Restart.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention solves the problem of not receiving an important incoming call because the mobile terminal can receive a voice incoming call even while using the data service for a long time. In addition, when the voice call ends, the reserved data service is automatically restarted and progressed, so that the user's convenience can be achieved.

Claims (3)

A method for receiving a voice call to a mobile terminal while a mobile switching center provides a data service to a mobile terminal through a base station system in a mobile communication system supporting voice and data services, the method comprising: Instructing the mobile terminal to transition to a data dormant state when a voice incoming call is attempted to the mobile terminal while providing a data service to the mobile terminal; When the mobile terminal transitions to the data dormant state, transmitting an incoming call message to the mobile terminal; And when the call response message is received from the mobile terminal, connecting the voice incoming call to the mobile terminal. The method of claim 1, wherein the step of instructing the transition to the data dormant state comprises: setting a predetermined field value of a FlashWithInfo message to a value indicating a transition to the data dormant state and transmitting it to the mobile terminal. Characterized in that the method. The method of claim 1 or 2, further comprising: terminating the data dormant state of the mobile terminal and restarting the data service when the voice incoming call ends.