KR20090124283A - Apparatus and method to prevent call collision in communication system - Google Patents

Abstract

PURPOSE: A call collision prevention method and an apparatus thereof for a waiting service in a communication system are provided to prevent the call collision by maintaining a call waiting state. CONSTITUTION: A receiving unit(171) receives an originating call and incoming call of a subscriber. A service determiner(173) confirms whether to subscribe a call waiting service of the subscriber. A call processing unit(175) maintains the originating call of the subscriber and previously process the originating call. If the subscriber is not the waiting service subscriber on a line, the call processing unit transmits a call failure signal to the originator.

Description

Method and device for preventing call collision in communication system {APPARATUS AND METHOD TO PREVENT CALLIS COLLISION IN COMMUNICATION SYSTEM}

The present invention relates to a method for preventing a call collision during a call between subscribers, and more particularly, to a method and apparatus for preventing a call collision according to incoming and outgoing calls occurring simultaneously in a specific terminal.

With the development of wireless communication terminal and mobile communication system, users can not only receive voice call service using wireless communication terminal but also various services such as karaoke, stock, weather, caller ID, call waiting, etc. have.

When the mobile communication system receives a call connection request from the calling terminal, it checks the location information of the called terminal, establishes a wireless link with the called terminal, and establishes a call path between the calling terminal and the called terminal. However, the mobile communication system may receive the requested outgoing call from the called terminal while establishing a communication path between the calling terminal and the called terminal. Then, the mobile communication system stops the call connection from the originating terminal to the requested called terminal and connects only the originating call requested from the called terminal. In this case, "call collision" occurs that the incoming and outgoing calls are simultaneously performed in the called terminal. When the call collision occurs, the mobile communication system first processes the outgoing call of the called terminal and receives the incoming call of the called terminal. Call connection from the calling terminal to the called terminal requested).

1 is a flowchart illustrating a process of generating a call collision in a conventional mobile communication system.

Referring to Figure 1, the exchange of the mobile communication system receives a call connection request from the calling terminal to the called terminal (S101). Then, the exchange performs paging transmission to the called terminal and establishes a radio link with the called terminal (S103).

However, the exchange may receive an outgoing call requesting a connection from the called terminal before step S103 is completed (S105). The exchange then preferentially processes the outgoing call of the called terminal and stops the call connection from the originating terminal to the requested called terminal. The exchange transmits a call failure signal indicating that the call has failed to the calling terminal (S107).

In summary, when a call collision occurs due to simultaneous occurrence of an outgoing / incoming call of a subscriber, the incoming call of the subscriber is removed and the outgoing call is processed first. However, as the wireless communication terminals become widespread and the usage increases, call collisions frequently occur. Therefore, if the originating call is removed when a call is collided according to the above method, then the caller should try to connect the call to the called party again, which may act as a factor to lower the subscriber's satisfaction.

The present invention has been proposed to solve the above problems, and an object thereof is to provide a method and system for preventing a call collision caused by simultaneous generation of incoming and outgoing calls.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to a first aspect of the present invention for achieving the above object, a call collision prevention method according to simultaneous occurrence of an outgoing and incoming call of a subscriber in a communication system, the method comprising: (a) receiving an outgoing call and an incoming call of the subscriber; (b) confirming whether the subscriber subscribes to the waiting service during a call; (c) if a busy waiting service subscriber, maintaining an incoming call of the subscriber in a waiting state and first processing an outgoing call; And (d) transmitting an incoming call waiting signal to the subscriber.

In accordance with a second aspect of the present invention for achieving the above object, there is provided a switching apparatus of a communication network for preventing a call collision due to simultaneous originating and incoming calls of a subscriber, comprising: receiving means for receiving an outgoing call and an incoming call of the subscriber; Service determining means for confirming whether or not the subscriber subscribes to a waiting service during a call; And a call processing means for maintaining an incoming call of the subscriber in a waiting state and first processing an outgoing call when the subscriber is a waiting service subscriber during a call.

The present invention prevents a call collision by maintaining a call waiting state without removing the called party's incoming call (that is, the calling party's outgoing call) even when the originating and incoming call occurs simultaneously at the called party's terminal. Accordingly, the present invention can increase the subscriber's satisfaction by eliminating the trouble of the caller who has to retry the call connection to the called party during the call collision.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a mobile communication system for preventing call collision according to an embodiment of the present invention.

2, a mobile communication system for preventing a call collision according to an embodiment of the present invention is a wireless communication terminal (110, 140), base station (120, 150), base station controller (130, 160), switch 170 ) And the home location register 180.

The wireless communication terminals 110 and 140 may wirelessly communicate with the base stations 120 and 150 and attempt to connect to other wireless communication terminals 110 and 140. Such wireless communication terminals 110 and 140 include PDAs, cellular phones, PCS phones, GSM phones, WCDMA phones, DMB phones, Wibro phones, Wifi phones, and the like.

The base stations 120 and 150 are base station transceiver subsystems (BTSs) or NodeBs, and are controlled by the base station controllers 130 and 160 and transmit and receive wireless signals, wireless channel encoding and decoding, signal strength and quality measurement, baseband signal processing, Perform radio resource management and self maintenance.

The base station controllers 130 and 160 assign and release radio channels to the wireless communication terminals 110 and 140, control transmission outputs of the wireless communication terminals 110 and 140 and the base stations 120 and 150, soft handoff and hard cell-to-cell. Handoff determination, transcoding and vocoding, and operation and maintenance functions for the base stations 120 and 150 are performed. The base station controllers 130 and 160 are a base station controller (BSC) or a radio network controller (RNC).

The exchange 170 is a mobile switching center (MSC) or a serving GPRS support node (SGSN), and provides an interface function with the base station controllers 130 and 160, and controls voice calls, data transmission and reception, and various additional services. In addition, the exchange 170 handles the call connection of the wireless communication terminal (110, 140), and provides a connection function with other external networks.

On the other hand, when the exchange 170 receives the outgoing call and the incoming call of a specific wireless communication terminal (110, 140) at the same time, if the wireless communication terminal (110, 140) is subscribed to check whether the standby service The incoming call is kept in a standby state to prevent a call collision. In other words, the exchange 170 maintains the incoming call in a standby state, and when the connection of the outgoing call of the wireless communication terminals 110 and 140 is completed, the incoming call is waiting to the wireless communication terminals 110 and 140. The alert sends a call waiting signal.

The home location register 180 stores and manages subscriber information and additional service information for each subscriber. In particular, the home location register 180 stores profile information of the wireless communication terminals 110 and 140. This profile information includes the telephone number (MSISDN) of the wireless communication terminals 110 and 140, IMSI, subscribed additional service information, and the like. In particular, the home location register 180 may store the presence or absence of a subscription waiting service for each subscriber.

3 is a flowchart illustrating a method for preventing call collision in a mobile communication system according to an embodiment of the present invention.

Hereinafter, a description will be given on the assumption that the calling terminal is 110 in FIG. 2, and the called terminal to which the calling terminal 110 attempts to connect a call is 140 in FIG. 2.

Referring to FIG. 3, the exchange 170 may receive a call connection request from the originating terminal 110 to the called terminal 140 (S301). That is, the exchange 170 receives a call connection request to the called terminal 140 via the calling base station 120 and the calling base station controller 130. Then, the exchange 170 transmits a paging signal to the called terminal 140 through the called base station 150 and the called base station controller 160 (S303).

Subsequently, the called terminal 140 receiving the paging signal receives a Radio Resource Control (RRC) to set a signaling radio bearer required for a paging response (ie, control plane data transmission). The process of establishing a connection is performed (S305). That is, the called terminal 140 transmits a message requesting an RRC connection to the called base station controller 160, and the called base station controller 160 sends a radio link of the called terminal 140 to the called base station 150. The message requesting the setting is transmitted, and a response message is received from the called base station 150. The terminating base station controller 160 transmits an RRC connection setup message to the called terminal 140 and receives an RRC connection complete message from the called terminal 140. Accordingly, the called terminal 140 sets up a signaling radio bearer and transmits a paging response signal to the exchange 170 through the signaling radio bearer (S307).

Next, the exchange 170 performs a procedure for setting a radio access bearer (hereinafter, referred to as "RAB") through which data is transmitted and received (S309). That is, the exchange 170 transmits an RAB allocation request message to the called base station controller 160, and the called base station controller 160 sets up the called terminal 140 and the RAB. When the RAB setup is normally completed, the called base station controller 160 receives the RAB setup complete message from the called terminal 140, and the exchange 170 receives the RAB bearer allocation response from the called base station controller 160. Receive.

When the RAB setting is completed, the exchange 170 sends a ring tone to the called terminal 140 (ie, ALERTING) and recognizes that the call has been received by the called terminal 140.

However, in the process of the exchange 170 paging / receiving with the called terminal 140 and setting the RAB to transmit a beep, the outgoing call may be received from the called terminal 140 (S311). That is, the exchange 170 may receive an outgoing call from the called terminal 140 during the process of the step S303 to the signal transmission step.

Then, the exchange 170 checks whether the called terminal 140 is subscribed to the waiting service during the call (S313). In this case, the exchange 170 may check whether the called terminal 140 subscribes to the waiting service of the called terminal 140 through its own stored database, and the calling terminal 140 is busy with the home location register 180 or the visitor location register. It can request the presence of the standby service and receive the result.

If the called terminal 140 is not subscribed to the waiting-for-service, the exchange 170 stops the call connection from the calling terminal 110 to the called terminal 140 requested and fails the call to the calling terminal 110. The message is transmitted (S315). Preferably, the exchange 170 may transmit a message such as "received call is not connected to the telephone. Please press 1 to leave a voice message" to the calling terminal 110.

On the other hand, if the called terminal 140 is subscribed to the call waiting service, the exchange 170 maintains a call waiting state from the calling terminal 110 to the called terminal 140 requested to connect (S317). Subsequently, the exchange 170 proceeds with the connection of the originating call requested from the called terminal 140, and when the connection of the originating call is completed (that is, the originating call of the called terminal is set as a call), the call received from the originating terminal is received. The call waiting signal indicating that the call is waiting is transmitted to the called terminal 140 (S319 and S321). Accordingly, even if the called terminal 140 is in a call connection with another terminal, the call receiving terminal 140 may receive a call waiting signal and recognize that the call of the calling terminal 110 is waiting.

In addition, the exchange 170 may receive a call connection signal from the called terminal 140 receiving the call waiting signal (S323). Then, the exchange 170 establishes a call path between the calling terminal 110 and the called terminal 140 and connects a call to enable a call between the calling subscriber and the called subscriber (S325).

According to the embodiment described above, the present invention can prevent a call collision by maintaining the call waiting state without removing the subscriber's incoming and outgoing calls simultaneously. On the other hand, in the above-described embodiment, the call collision prevention method according to the present invention has been described using the asynchronous mobile communication system as an example. .

4 is a diagram showing the configuration of an exchange apparatus for preventing a call collision according to an embodiment of the present invention.

As shown in FIG. 4, an exchange apparatus 170 for preventing a call collision according to an embodiment of the present invention includes a receiver 171, a service determiner 173, and a call processor 175.

The receiving unit 171 receives a call connection request from the calling terminal 110 or the called terminal 140. In addition, the receiver 171 may receive a call connection signal according to an incoming call waiting signal from the called terminal 140.

The service determination unit 173 checks whether the terminals 110 and 140 subscribe to the waiting service during the call. The service determination unit 173 may store information on whether or not to subscribe to a waiting service for each subscriber, and request the subscriber to subscribe to a service during a call from the home location register 180 or the visitor location register and receive the result. You may.

The call processing unit 175 forms a call path between the calling terminal 110 and the called terminal 140 to connect the call. On the other hand, when the call processing unit 175 receives the outgoing call from the called terminal 140 during the formation of the call between the calling terminal 110 and the called terminal 140, the called terminal through the service determination unit 173 ( Check if 140 is subscribed to the call waiting service and, if subscribed, maintains the call from the calling terminal 110 to the called terminal 140 requested to be connected and waits for the request from the called terminal 140. Prioritize outgoing calls. That is, when the incoming and outgoing calls of the called terminal 140 occur simultaneously, the call processing unit 175 maintains the incoming call of the called terminal 140 in a call waiting state and processes the outgoing call of the called terminal 140 first. do.

On the other hand, when the called terminal 140 is not subscribed to the call waiting service, the call processing unit 175 stops the call connection from the calling terminal 110 to the called terminal 140 requested, the called terminal ( Only the originating call of 140) is processed.

On the other hand, the call processing unit 175 is a call indicating that the call of the calling terminal 110 is waiting when the incoming call of the called terminal 140 is completed in the state that the incoming call of the called terminal 140 is maintained in the call waiting The standby signal is transmitted to the called terminal 140. When the call connection signal according to the incoming call waiting signal is received from the called terminal 140, the call processing unit 175 forms a call path between the called terminal 140 and the calling terminal 110 that has sent the call. Connect it. In addition, when the call processing unit 175 stops the incoming call connection of the called terminal 140, a call failure signal indicating that the call connection failed to the calling terminal 110 attempted to connect to the called terminal 140. send.

The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

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. It should not be construed as limited to.

1 is a flowchart illustrating a process of generating a call collision in a conventional mobile communication system.

2 is a diagram illustrating a mobile communication system for preventing call collision according to an embodiment of the present invention.

3 is a flowchart illustrating a method for preventing call collision in a mobile communication system according to an embodiment of the present invention.

4 is a diagram showing the configuration of an exchange apparatus for preventing a call collision according to an embodiment of the present invention.

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

110, 140: wireless communication terminal 120, 150: base station

130, 160: base station controller 170: switchboard

180: home location register

Claims (6)

As a method of preventing call collision caused by simultaneous occurrence of subscriber's incoming / outgoing calls in a communication system, (a) receiving the outgoing and incoming calls of the subscriber; (b) confirming whether the subscriber subscribes to the waiting service during a call; (c) if a busy waiting service subscriber, maintaining an incoming call of the subscriber in a waiting state and first processing an outgoing call; And (d) transmitting an incoming call waiting signal to the subscriber. The method of claim 1, (b) if it is not a waiting service subscriber as a result of the checking, transmitting a call failure signal to the caller who originated the incoming call. The method of claim 1, (e) receiving a call connection signal according to an incoming call waiting signal from the subscriber; And (f) connecting a call between the subscriber and the caller who originated the incoming call. As a switching device of a communication network that prevents a call collision due to simultaneous incoming / outgoing call of a subscriber, Receiving means for receiving the outgoing and incoming calls of the subscriber; Service determining means for confirming whether or not the subscriber subscribes to a waiting service during a call; And And a call processing means for maintaining an incoming call of the subscriber in a waiting state and first processing an outgoing call when the subscriber is a call waiting service subscriber. The method of claim 4, wherein The call processing means, And when the subscriber is not a call waiting service subscriber, transmits a call failure signal to the caller who originated the incoming call. The method of claim 4, wherein The call processing means, When receiving a call connection signal according to the incoming call waiting signal from the subscriber, the switching device characterized in that for connecting the call between the subscriber and the originator calling the incoming call.

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