KR100429289B1 - Method for waiting data call - Google Patents

Abstract

According to an aspect of the present invention, there is provided a method of receiving a voice call connection request from a switching station to a mobile station while a packet data call is connected, and transmitting the received voice call to the mobile station, and responding to the voice call from the mobile station. Receiving a connection request and a hold request for the use of a data call, and in response to the request, requesting a packet control device to suspend and buffer transmission of a data packet, and requesting a data packet from the packet control device to the mobile station. Receiving a response to accept transmission stop and buffering, and correspondingly to the response, to the mobile station that the hold of the data call has been accepted, and requesting the switching center to transfer the call to the requested voice call; and In response to the response, the connection with the packet control device is maintained and the A data call waiting method is provided which comprises allocating a radio resource used for connection with a mobile station to the voice call.

Description

How to call a voice call while using a data call {METHOD FOR WAITING DATA CALL}

The present invention relates to a data call waiting method. More specifically, when a voice call is received while using a data call, the present invention relates to a method of temporarily holding a data call in use, receiving a voice call, and then switching back to the used data call.

Many mobile communication service users can use call waiting services to receive voice calls in a call through simple key operations. Call waiting service refers to a service that does not terminate an active call and does not terminate the incoming call when another voice call is received while using a voice call and connects a new voice call. 1 is a flowchart illustrating a call waiting service call flow in a voice call.

When a call connection request is received from a third user while the first user is maintaining a voice call with the second user (100), the switching center transmits Flash with Information to the base station to which the first user is connected ( 110). Here, the flash notification 110 indicated by a solid line is signaling for notifying the first user that a new call connection request has been received. The base station receiving the flash notification from the switching center transmits the flash notification over the traffic channel connected with the first user (120). Here, the flash notifications 120 and 130 indicated by dotted lines are signaling transmitted through an open traffic channel. The first user who recognizes the call incoming from the third user transmits the flash notification for the voice call transfer to the base station (130). The base station receiving the flash notification from the first user transmits a flash notification to the switching center requesting a call connection with the third user (140). Upon receiving the flash notification from the base station, the switching center disconnects the first user-second user communication path, transmits a holding tone to the second user, and establishes the first user-third user communication path (150). ). Through the above-described series of processes, the first user can make a voice call with the third user.

On the other hand, due to the development of mobile communication technology and Internet technology, mobile communication service is advanced from voice call to data communication. As a result, the mobile communication service user can check the mail by using the mobile communication terminal and enjoy surfing the web. In addition, personal home pages that were available in a wired Internet environment can also be used in the form of phone pages in a mobile communication environment.

Currently, many mobile communication service users are using various services such as wireless Internet using data calls as well as voice calls using mobile terminals, and the ratio thereof is increasing. However, when a voice call is received while using a data call, even if the user is able to receive or receive a voice call even if the user is subscribed to a call waiting service, the active data call must be completely terminated and the voice call must be received. Therefore, since the continuity of the previously used data service is not provided after the use of the voice call, the data call connection must be attempted from the beginning. For this reason, it takes a lot of time when reconnecting the data call, and it takes a lot of time and a lot of data exchange to move back to the menu that was in use due to the characteristics of the wireless Internet service.

Accordingly, in order to solve the above problems, an object of the present invention is to provide a voice call receiving method and apparatus for using a data call which can be switched to a voice call received while using a data call.

Another object of the present invention is to provide a method and apparatus for receiving a voice call during a data call that can use a reserved data call without reconnection when the switched voice call is terminated.

It is still another object of the present invention to provide a method and apparatus for receiving a voice call during use of a data call which can ensure the continuity of the data call even after the voice call ends.

1 is a flowchart illustrating a call waiting service call flow in a voice call.

2 is a flow chart illustrating a data call hold process according to one preferred embodiment of the present invention.

3 is a flowchart illustrating a data call reconnection process according to an embodiment of the present invention.

In order to achieve the above objects, according to an aspect of the present invention, a data call waiting method executed in a base station connected via a network with an exchange station and a packet control apparatus and wirelessly connected to at least one mobile station, the method comprising: Receiving a first flash notification informing that there is a voice call connection request to the mobile station, forwarding a second flash notification corresponding to the first flash notification to the mobile station, and from the mobile station to the second flash notification; Receiving a third flash notification requesting the voice call connection and a first packet stop request requesting the suspension of data call usage in response to the notification; and corresponding to the first packet stop request, stopping transmission of the data packet. And generating a second packet stop request requesting buffering and delivering the second packet stop request to the packet control device. And receiving, from the packet control device, a first packet stop response to accept transmission stop and buffering of the data packet to the mobile station in response to the second packet stop request, and corresponding to the first packet stop response. Forwarding a second packet stop response to the mobile station informing that the hold of the data call has been accepted, and forwarding a fourth flash notification to the switching center requesting a call transfer to the connection requested voice call and the first packet stop response. Correspondingly, there is provided a data call waiting method comprising maintaining a connection with the packet control device and allocating a radio resource used for the connection with the mobile station to the voice call.

Here, the base station is a base station (BTS) for controlling radio matching of the mobile station and the code division multiple access scheme, a control station (BSC) for routing information between the base station (BTS) and the mobile station and various call processing and soft handoffs. At least one of a control station manager (BSM) for controlling the operation / maintenance process of the base station (BTS) and the control station (BSC).

In addition, the third flash notification and the first packet abort request may be delivered simultaneously or integrated into one signal.

The data call waiting method may further include: transmitting a sixth flash notification requesting the voice call disconnection to the switching center in response to a fifth flash notification notifying the end of the voice call received from the mobile station; In response to the notification, forwarding a packet abort termination request requesting retransmission of a data packet to the packet control device, and receiving a packet abort termination response acknowledging the retransmission of the data packet in response to the packet abort termination request. And in response to the packet abort termination response, allocating the radio resource allocated to the voice call to the data call. Here, the second flash notification, the third flash notification and the fifth flash notification are transmitted and received through a traffic channel connected between the mobile station and the base station. In addition, the second packet stop request, the first packet stop response, the packet stop cancellation request, and the packet stop cancellation response are transmitted and received through an A9 connection.

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

2 is a flowchart illustrating a data call hold method according to an exemplary embodiment of the present invention.

Referring to FIG. 2, in step 200, the mobile station MS is using a data call connected to any data processing device (e.g., a web server, etc.) via a base station-station-PCF-PDFN. In fact, an A8 connection, which is a data transmission / reception interface, is established between the base station BS and the packet control device PCF, and the mobile station MS and the packet data service node PDSN are connected through a PPP protocol. .

Here, a brief description of the apparatus according to the present invention, the base station (BS) is a base station (BTS) for controlling radio matching of the mobile station (MS) and code division multiple access scheme, between the base station (BTS) and the mobile station A control station (BSC) for controlling routing of information and various call processing and soft handoff, and a control station manager (BSM) for controlling the operation maintenance processing of the base station (BTS) and the control station (BSC). In the present specification, all of the above-described base station (BTS), control station (BSC) and control station manager (BSM) will be referred to as the base station (BS). The switching center (MSC) also includes a Visitor Location Register (VLR) that manages mobile subscriber information. In addition, a packet control function (PCF) is an interworking device of a mobile communication network for interworking with a packet data communication network. A Packet Data Serving Node (PDSN) establishes a Point-to-Point Protocol (PPP) connection with a mobile station and connects a user connected via a mobile communication network to a packet data communication network. It functions as a node and transmits user authentication and billing information through the billing server. In particular, the packet controller PCF performs a temporary storage function and a packet division function of data packets to be delivered to the mobile station MS received from the packet data service node PDSN. In addition to the above-described packet control device (PCF) and packet data service node (PDSN), there is a terminal management unit (SCMM: Session Control and Mobility Management), etc. Since it is not used directly in the implementation of the invention, the display and description in the drawings are omitted.

In step 210, when a voice call connection request is received from another mobile station or a landline telephone (hereinafter referred to collectively as another subscriber station), the switching center MSC forwards a flash notification to the base station BS. In more detail, when a voice call connection request is received from another subscriber station, the switching center (MSC) confirms through the subscriber information whether the mobile station (MS) has subscribed to the call waiting service. If the subscriber is subscribed to the call waiting service, the flash notification is transmitted to the base station BS. In contrast, if the mobile station MS has not subscribed to the call waiting service, it ignores the voice call connection request from another subscriber station.

In step 220, when the base station BS receives the flash notification from the switching center MSC, the base station BS transmits a flash notification indicating that there is a voice call connection request through a traffic channel connected between the mobile station MS and the base station BS. More specifically, upon receiving the flash notification from the switching center MSC, the base station BS checks whether the traffic channel is connected to the mobile station MS and whether the traffic channel is used for the data call. As a result of the check, if a traffic channel for data call use is connected, a flash notification is transmitted to the mobile station (MS) indicating that there is a request for voice call connection through the traffic channel.

In step 230, the mobile station MS receives the flash notification from the base station BS, and then delivers the flash notification for connecting the voice call to the base station BS through the traffic channel. Here, the mobile station outputs a flash notification received from the base station as a sound or displays it on the display device, so that the user can recognize that there is a voice call connection request from another subscriber station. Recognizing that there is a voice call connection request from another subscriber station, the user can selectively accept the voice call connection by operating any key. The mobile station MS sends a flash notification to the base station BS when there is a user's key operation. At the same time, the mobile station MS may display the screen corresponding to the data call being used by the user in the internal buffer and display the screen displayed when using the voice call on the display device, or output the still screen as it is.

In step 240, the mobile station (MS) forwards a packet abort request to the base station (BS) via the traffic channel to hold the data call currently in use. Here, the flash notification for accepting the voice call connection in step 230 and the packet stop request for data call holding in step 240 may be transmitted at the same time. In addition, the base station BS may regard the flash notification as a packet stop request and transmit the packet stop request to the packet control device PCF simultaneously with the voice call connection.

In step 250, upon receiving the flash notification and the packet stop request from the mobile station MS, the base station BS stops the packet transmission to the mobile station MS through the A9 interface connected with the packet control device PCF and stops the packet after the transmission stop. The packet stop request for the buffering of the packet is forwarded to the packet control device (PCF). The A9 interface is an interface for signaling transmission and reception regarding the establishment, termination, and management of an A8 connection between a base station and a packet control device (PCF). Thereafter, if there is no response from the packet control device PCF within a predetermined time, the base station BS ends the data call hold operation.

In step 260, upon receiving the packet stop request from the base station BS, the packet control device PCF forwards the packet stop response to the base station BS via the A9 interface. In more detail, when a packet stop request is received from the base station BS, the packet control device PCF checks the current buffer amount and / or the number of pending data calls, and the like and buffers the data call for which the packet stop request has been made. Determine whether this is possible. If buffering is possible, the packet control device PCF starts to store the received data packet in the buffer after the packet stop request, and transmits the packet stop response to the base station BS. At this time, by maintaining the A8 connection established between the base station BS and the packet control device PCF without terminating, the connection time can be shortened when reconfiguring the existing data call after the end of the voice call.

In step 270, upon receiving a packet stop response from the packet control device PCF within a certain time, the base station BS sends a packet stop response to the mobile station MS through the traffic channel indicating that the hold of the packet data has been successfully performed. And proceed to step 280 to deliver a flash notification to the switching center (MSC) requesting the transfer of the incoming voice call.

In steps 290 to 295, upon receiving a packet stop response from the base station BS, a voice call is connected between the mobile station MS and another subscriber station, and the data call in use is suspended. In more detail, the base station (BS) is a radio resource (eg, pilot channel, sink channel, paging channel, traffic channel) used for the connection between the mobile station (MS) and the base station (BS) for data call use Is assigned to the voice call, and the A8 connection established for data packet exchange between the base station BS and the packet control device PCF is maintained.

3 is a flowchart illustrating a data call reconnection process according to an embodiment of the present invention.

Steps 290 to 295 show a process in which the user is using the voice call while holding the data call after switching to the incoming voice call while using the data call.

In step 300, if the voice call in use in the data call on hold is terminated by the user, the mobile station MS sends a flash notification to the base station BS via the traffic channel indicating that the voice call has ended. When the user ends the voice call by operating any key, the mobile station MS transmits a flash notification to the base station BS requesting the disconnection of the voice call being used. At the same time, the mobile station MS reads the screen corresponding to the data call used by the user from the internal buffer and displays it on the display device.

In step 310, upon receiving the flash notification from the mobile station MS, the base station BS forwards the flash notification to the switching center MSC requesting the disconnection of the voice call connected between the mobile station MS and the switching center MSC. The switching center MSC receiving the flash notification requesting the voice call truncation disconnects the voice call connected to the mobile station MS.

In step 320, after forwarding the flash notification requesting the disconnection of the voice call to the switching center MSC, the base station BS checks whether there is a data call connected with the corresponding mobile station MS. As a result of the check, if there is a data call currently pending, the base station BS transmits a packet stop cancellation request to the packet control device PCF requesting restarting packet transmission to the mobile station MS.

In step 330, upon receiving the packet stop cancellation request from the base station BS, the packet control device PCF terminates the packet stop and transmits a packet stop cancellation response to the base station BS indicating that the packet stop cancellation has been accepted. . In response to the packet stop cancellation request, the packet control device PCF initiates the transmission of the buffered data packet through the A8 connection with the pending base station BS, and sends the data packet received after the packet stop cancellation to the mobile station MS. send.

In step 340, the mobile station MS can use the data call again through the A8 connection, which has been suspended by the above-described steps 300 to 330. That is, the base station BS allocates the radio resource allocated to the voice call to the data call again, and transmits the data packet received from the packet control device PCF to the mobile station MS.

Summarizing the present invention described above with reference to specific embodiments, the present invention proposes a method of supporting the continuity of a previous packet data call after the termination of an incoming voice call by temporarily suspending an ongoing data call when a voice call is received while the data call is in progress. do. At this time, the radio resources occupied by the previous data call are reassigned to the voice call without being terminated. Here, the radio resource between the mobile station and the base station is used for the voice call, the A8 connection between the base station and the packet control device is maintained, and the packet to be transmitted is buffered in the packet control device. Therefore, after the voice call is terminated, the data call can be quickly reconnected without resetting the radio resource and the A8 connection, and the efficiency of the radio resource can be increased because the radio call is not unnecessarily occupied during the voice call.

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, according to the present invention, it is possible to switch to an incoming voice call when using a data call, which has not been possible in the past, and the user does not need to reconnect when using the data call again after the end of the voice call. You can do it. In addition, during the transition from data call to voice call to data call, the continuity of the previously used data call is maintained, thereby eliminating the need to receive the data packet already received, thereby saving the user a great deal of time and money. do.

Claims (6)

A data call waiting method executed in a base station connected to a switching center and a packet control apparatus via a network and wirelessly connected to at least one mobile station, Receiving a first flash notification from the switching center notifying that there is a voice call connection request to the mobile station; Forwarding a second flash notification corresponding to the first flash notification to the mobile station; Receiving a third flash notification from the mobile station in response to the second flash notification and a first packet abort request requesting the suspension of data call usage and a third flash notification requesting the voice call connection; In response to the first packet stop request, generating and transmitting a second packet stop request to the packet control device to request transmission stop and buffering of the data packet; Receiving a first packet stop response from the packet control device to accept transmission stop and buffering of the data packet to the mobile station in response to the second packet stop request; In response to the first packet abort response, forwarding a second packet abort response to the mobile station informing that the hold of the data call has been accepted, and forwarding a fourth flash notification to the switching center requesting a call transfer to the connection requested voice call. step; And In response to the first packet abort response, maintaining a connection with the packet control device and allocating a radio resource used for connection with the mobile station to the voice call. The method of claim 1, The base station includes a base station (BTS) for controlling radio matching of the mobile station and code division multiple access scheme, a control station (BSC) for controlling routing of information between the base station (BTS) and the mobile station, various call processing and soft handoff, and a base station. (BTS) and a control station manager (BSM) for controlling the operation / preservation processing of the control station (BSC). The method of claim 1, And the third flash notification and the first packet abort request may be delivered simultaneously or integrated into one signal. The method of claim 1, Forwarding a sixth flash notification requesting the voice call disconnection to the switching center in response to a fifth flash notification notifying the end of the voice call received from the mobile station; In response to the fifth flash notification, forwarding a packet stop cancellation request to the packet control device requesting retransmission of a data packet; Receiving a packet stop cancellation response to accept retransmission of a data packet in response to the packet stop cancellation request; And And in response to the packet abort response, allocating the radio resource assigned to the voice call to the data call. The method of claim 4, wherein And wherein the second flash notification, the third flash notification and the fifth flash notification are transmitted and received over a traffic channel connected between the mobile station and the base station for data call use. The method of claim 4, wherein The second packet abort request, the first packet abort response, the packet abort cancel request, and the packet abort cancel response are transmitted and received over an A9 connection.