KR20010009947A - Call direction changing method in telecommunication system - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to call direction switching of an originating signal according to an incoming call in a communication system.

I. The technical problem to be solved by the invention

In a communication system, when a user attempts to make a call and there is an incoming call from any user while the call path is not connected, the incoming call can be preferentially performed.

All. Summary of Solution of the Invention

SUMMARY OF THE INVENTION The present invention provides a method for call redirection in a communication system.

Storing the information by the call origination of the first subscriber; and if there is an incoming request for calling the first subscriber by the third subscriber, the stored information is retrieved and the allocation request message by the call origination of the first subscriber is received. Checking whether the message has been transmitted to the first subscriber, and converting a call processing procedure of the first subscriber to a call reception if the allocation request message has not been transmitted.

la. Important uses of the invention

It is used to redirect the call in a communication system.

Description

CALL DIRECTION CHANGING METHOD IN TELECOMMUNICATION SYSTEM}

The present invention relates to call origination and call reception in a communication system, and more particularly, to a method for processing incoming calls first when call origination occurs in a state of making a call.

In general, when a call is made in a state where a call is made and a call is not connected to a call according to an outgoing call, the exchange system unconditionally performs a call processing procedure for the call origin.

1 is a block diagram schematically illustrating a system configuration of a conventional wireless communication system.

2 is a flowchart schematically showing a call processing procedure in a situation in which a call is received when a call is originated in a conventional wireless communication system.

A conventional call processing procedure is described below with reference to FIGS. 1 and 2.

In step 200 of FIG. 2, the mobile subscriber makes a call request setting to the mobile subscriber call processing process 115 by call origination using the terminal A (142). Then, in step 201, the subscriber call processing process 115 assigns a temporary mobile subscriber identity (TMSI) so that the call signal processing process 113 operates (step 202). Thereafter, in step 220, the call signal processing process 113 delivers the calling subscriber information request and TMSI to the visited subscriber registration database 131 of the VLR 130 and stores the TMSI in the database 131. On the other hand, in step 230, a call request signal is transmitted from another ASP (Access Switching Processor: 120: " ASP ") by a call origination from the third subscriber 152, and the call processing process 113 is called. Upon requesting the information, the terminal 142 transmits the incoming subscriber information indicating that the terminal 142 is busy according to the content inspection of the visitor registration database 131 to the call signal processing process 113. At this time, the call signal processing process 113 transfers the received information to the paging processing process 114 to request paging. In step 251, the paging process 114 checks the visitor registration database 131 of the VLR 130 according to the received recipient and transmits the busy state to the calling party process 113 because the terminal 142 is in use. . That is, the terminal 142 is busy because the terminal 142 is busy with respect to the call request requested by the third subscriber 152, that is, the paging is failed.

Therefore, in the conventional call processing procedure, the call is not diverted by busy processing the call request received during the call. In general, when an incoming call is made at the time of attempting a telephone call, it is common to give priority to the incoming call. However, in the conventional switching system, there is a problem that the user cannot obtain the information of the incoming call by busy processing the incoming call when the call originates.

Accordingly, an object of the present invention is to provide a method for converting a call to an incoming call if there is a call incoming when the call is originated.

Another object of the present invention is to provide a method for allowing a user to connect a call path in response to a user's request when calling and receiving a call.

Still another object of the present invention is to provide a method for automatically switching a call to an incoming call when there is a call incoming.

In order to achieve the above object, the present invention provides a method for call redirection in a communication system,

Storing the information by the call origination of the first subscriber; and if there is an incoming request for calling the first subscriber by the third subscriber, the stored information is retrieved and the allocation request message by the call origination of the first subscriber is received. Checking whether the message has been transmitted to the first subscriber, and converting a call processing procedure of the first subscriber to a call reception if the allocation request message has not been transmitted.

1 is a block diagram schematically illustrating a system configuration of a conventional wireless communication system.

2 is a flowchart schematically showing a call processing procedure in a situation in which a call is received when a call is originated in a conventional wireless communication system.

3 is a flowchart schematically illustrating a call processing procedure in a situation in which a call is received when a call is originated in a wireless communication system according to an embodiment of the present invention.

Figure 4 shows a schematic control flow for controlling the call processing procedure according to the incoming call when the call originates in the wireless communication system according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to aid a more general understanding of the present invention, and it should be understood by those skilled in the art that the present invention may be practiced without these specific details. It will be self explanatory. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram schematically illustrating a system configuration of a conventional wireless communication system.

3 is a flowchart schematically illustrating a call processing procedure in a situation in which a call is received when a call is originated in a wireless communication system according to an embodiment of the present invention.

Figure 4 shows a schematic control flow for controlling the call processing procedure according to the incoming call when the call originates in the wireless communication system according to an embodiment of the present invention.

The configuration of a communication system according to an embodiment of the present invention will be briefly described below with reference to FIG. 1.

In general, a CDMA wireless communication system of CODE DIVISION MULTIPLE ACCESS (hereinafter referred to as "CDMA") is a base station transmission system (BTS: BASE) connected to a plurality of terminals (A, B: 142, 152) to connect a call path via wireless. STATION TRANSCEIVER SYSTEM: 141, 151: hereinafter referred to as "BTS" or base station transmission system ", and a base station for controlling a plurality of base station transmission systems (BSC: BASE STATION CONTROLLER: 140, 150: hereinafter referred to as" base station ") And a switch (MSC: MOBILE SWITCHING CENTER: 100, 101: hereinafter referred to as an “exchange”) connected to a plurality of base stations to perform a switching operation by origination and reception. SWITCHING PROCESSOR: 110, 120: hereinafter referred to as "ASP", each ASP is connected to a base station to communicate with each other, and the ASP has TMSI buffers 111 and 121 and an incoming call processing process 112. 122, call signal processing processes 113 and 123, and p. It has a processing process 114, 124, and a mobile subscriber process 115, 125. The incoming call processing process 112, 122 and the outgoing call processing process 113, 123 by the incoming or outgoing call of the subscriber Control the operation, and paging processing 114, 124 is a process for calling a subscriber by call origination, TMSI buffers 111, 121 are allocated one at the time of incoming or outgoing subscriber and released at the end of the call. A TMSI is used as an identifier to manage the current call processing status in relation to subscriber call processing.

The VLR (VISITOR LOCATION REGISTER: 130: hereinafter referred to as "VLR" or "Visitor Register") visits data such as subscriber identification data and information indicating whether the subscriber is valid and TMSI buffer number according to call origination and reception. It is stored in the subscriber registration database 131.

1 and 3, the operation of an embodiment according to the present invention will be described below.

In step 300 of FIG. 3, the mobile subscriber's call processing process 115 in the ASP 110 of the exchange 100 via the BTS 141 and the base station 140 by the call origination using the terminal A: 142. ) To request call setup. Then, in step 301, the subscriber call processing process 115 assigns a temporary mobile subscriber identity (TMSI) and causes the first call processing process 113 to operate (step 302). In addition, in step 303, a call setup message by the call origination of the subscriber is received, and the base station 140 notifies the base station 140 of a call processing progress message indicating that the call setup request has been accepted by the network. Done. In step 304, the first call signal processing process 113 transmits the calling subscriber information request and the assigned TMSI to the visitor registration unit 130 database 131 and stores the TMSI in the database 131. That is, the data stored in the subscriber registration database 130 may be the TMSI buffer number information, the subscriber identification number, and data indicating whether the subscriber is a serviceable subscriber. Tables 1 and 2 below show examples of the visitor registration database 131 of the TMSI buffer 111 and the visitor registration unit 130.

TMSI Buffer Number Data storage according to call processing progress One ...... 2 ...... ... ......................

database Subscriber information, TMSI buffer number, subscriber number ..... First subscriber ...... 2nd subscriber ...... ... ......................

In step 310, a call request signal is transmitted from another ASP 120 by a call origination from the third subscriber 152, and when the third call processing process 123 makes a callee information request, the visited subscriber registration database ( 131). If the search result indicates that the ASSIGNMENT REQUEST MESSAGE has not been transmitted to the first subscriber, the third party signaling process 123 notifies the called party information response and the TMSI buffer information allocated for the first subscriber. do. In the above description, the third signal processing process 123 is made of another ASP 120, but may be present in another switch 101 or in the same ASP 110. That is, when the third subscriber calling the first subscriber is under the control of the same base station 140, the third call signaling process may exist in the same ASP 110. In step 311, the visitor registration unit 130 notifies the originating subscriber information response message to the first call signal processing process 113. The subscriber information response message is a message indicating whether the first subscriber is a normal service user. In the flow of FIG. 3, the operation is performed after step 310, but may be performed before or after step 320. The third originating signal processing process receiving the subscriber subscriber information response message provided by step 312 and the TMSI buffer information of the first subscriber requests the incoming paging using the information received by the paging processing 114 in step 313. Provide the TMSI buffer information of the first subscriber. The paging process 114 searches the TMSI buffer 111 according to the TMSI buffer information to retrieve the contents of the corresponding buffer assigned to the first subscriber. If the search result indicates that the allocation request message is not transmitted to the first subscriber, the process proceeds to step 314 and notifies the third call processing process 123 that the subscriber status is IDLE. That is, it notifies that call transfer is possible. The paging process 114 then notifies the first originating signal processing process 113 of the message requesting the redirection of the call. Then, the first call signal processing process 113 searches the TMSI buffer 111 and checks again whether the allocation request message is not transmitted to the base station 140. In this case, if the call transfer is possible, the process proceeds to step 321 in which the paging response notification and the TMSI buffer information of the first subscriber are transmitted to the third call processing process 123. In step 322, the third call processing process 123 transmits the incoming call request and the TMSI buffer information of the first subscriber to the mobile subscriber call processing process 115. At this time, the mobile subscriber call processing process 115 searches the TMSI buffer 111 again and checks whether the first subscriber is in a state where call transfer is possible. If the call transfer is possible, the process proceeds to step 330 to terminate the first call signal processing process 113 and to operate the incoming call processing process 112. Then, in step 331, the incoming call processing process transmits, to the base station, a signal "MOBILE TERMINATED" indicating that the incoming state is received, rather than the signal "MOBILE ORIGINATED" in the outgoing state. The base station then sends an ALERT WITH INFORMATION MESSAGE to the terminal. The subsequent operation is similar to the normal call processing procedure, and detailed description thereof is omitted.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 4.

If there is a call origination by the first subscriber in step 400, the process proceeds to step 401 to allocate a TMSI buffer and to store the call processing progress in the allocated buffer. In step 402, if the request for information and authentication of the calling subscriber is a valid subscriber is completed, the process proceeds to step 403 to search for the subscriber information register 130 and stores TMSI information allocated to the subscriber's database. Although the subscriber authentication operation by step 402 described above is described first, it can be made after step 410 which will be described below. In step 410, if there is a call request for calling the first subscriber from the third subscriber, the flow proceeds to step 411. Steps 411 and 412 call the first subscriber according to the first subscriber information. In step 413, the TMSI buffer allocated to the first subscriber is searched for and checked whether the allocation request message is transmitted to the first subscriber (step 420). If the allocation request message is transmitted, the call redirection is requested to the first subscriber in step 421 (paging processing process). In step 422, the TMSI buffer 111 is searched again to check whether the call can be switched. If call transfer is possible, the process proceeds to step 423 to notify the paging response to the third subscriber and delivers TMSI information of the first subscriber. In step 430, the originating operation is interrupted through the process ID through the received TMSI information to the first subscriber, and the incoming call operation is performed (steps 430 to 432). In step 434, the " MOBILE TERMINATED " signal indicating that the call has been transferred to the first subscriber is transmitted in the allocation request message. The subsequent operation is an operation according to a general incoming call, and a detailed description thereof will be omitted.

Briefly, the present invention stores TSM registration and call processing status by a call origination of a first subscriber, and retrieves the call processing status when there is an incoming request for calling the first subscriber by a third subscriber. If the call transfer is possible, the call processing procedure of the first subscriber is transferred to the call reception.

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 claims below, but also by the equivalents of the claims of the present invention.

As described above, the present invention stores the information by the call origination of the first subscriber, and if there is an incoming request for calling the first subscriber by the third subscriber, retrieves the stored information and makes a call to the first subscriber. If the allocation request message is not transmitted to the first subscriber side, the call processing procedure of the first subscriber is switched to the incoming call. can do.

Claims (16)

In the method for call redirection in a communication system, Storing information by call origination of the first subscriber; If there is an incoming request for calling the first subscriber by a third subscriber, retrieving the stored information and checking whether an allocation request message by a call origination of the first subscriber is transmitted to the first subscriber; And if the allocation request message is not transmitted, converting the call processing procedure of the first subscriber to the incoming call. The method of claim 1, wherein the storing of the information comprises: A mobile subscriber process assigning a TMSI and driving a first outgoing signal processing process when a call origination request is made from a base station by a call origination of the first subscriber; Requesting information of the first subscriber from Bayer by the first call processing process; If the subscriber is a valid subscriber in response to the request for information, storing information regarding the origination of the first subscriber's call in the BR and storing a call processing situation in response to the origination of the first subscriber's call in the assigned TS. Method comprising a. The method of claim 2, wherein the storing by the call origination, Storing the allocated buffer number of the TS packet allocated to the V-L in the data base of the first subscriber; And storing call processing status information according to call origination of the first subscriber in a buffer of the allocated TMS. The method of claim 1, wherein the checking of the incoming call request comprises: After storing the information of the call origination of the first subscriber in a BS, checking whether there is an incoming subscriber information request for calling the first subscriber by the third subscriber from the third call processing process; And if the request is made, searching for the information stored in the VRL and checking whether the allocation request message by the call origination of the first subscriber is transmitted to the first subscriber. The method of claim 1, wherein the step of switching to the call forwarding is performed. If the incoming request is made, the third outgoing call processing process providing the paging request and the information by the call origination to the paging processing process by the information by the call origination of the first subscriber provided from the BS; And the paging processing process converts a call processing procedure to a call destination according to the call processing progress state of the first subscriber based on the information by the origination. The method of claim 5, wherein after providing a paging request and information by the call origination to the paging process, Checking a call processing progress state of the first subscriber according to the information by the call origination; If the check result indicates that the call processing procedure of the first subscriber can be switched to a call reception, the third call signaling process is notified of the first subscriber state, and the call direction is transmitted to the first call signaling process of the first subscriber. Sending a message requesting a switch; And according to the message, the first originating signal processing process converts a call processing procedure into a call destination according to the call processing progress state of the first subscriber. The method of claim 6, further comprising, after the step of transmitting a message for requesting call redirection to the first call processing process. Providing, by the first call signal processing process, a paging response notification and first call signal processing process information of the first subscriber according to the message; Providing, by the third calling signal processing process, a request for incoming call request and first calling signal processing process information to the mobile subscriber calling process by the first calling signal processing process information; And the mobile subscriber call processing process converts a call processing procedure into a call destination according to the call processing progress state of the first subscriber. 8. The method of claim 7, wherein after providing the third subscriber information to the mobile subscriber process, If the mobile subscriber call processing process is capable of converting the call processing procedure of the first subscriber to a call reception, the mobile subscriber call processing process terminates the operation of the first call signaling process and the incoming call for the first subscriber. Running the processing process, And wherein the incoming call processing process transmits an assignment request message and an alert with information message to the first subscriber. The method of claim 1, wherein in the process of converting the call processing procedure to call forwarding, And a message indicating that a call direction is mobile terminated in an allocation request message transmitted to the first subscriber. In the method for call redirection in a communication system, Storing TMSI registration and call processing status by call origination of a first subscriber; If there is an incoming request for calling the first subscriber by a third subscriber, checking the call processing status to check whether a call transfer is possible; And when the call transfer is possible, converting the call processing procedure of the first subscriber to the incoming call. 11. The method of claim 10, wherein the process of storing TMSI registration and call processing status by the origination of the first subscriber, And allocating a TS eye buffer to store the call processing state and storing the allocated TS eye buffer information in a visited subscriber register. The method of claim 10, wherein the checking of whether the call transfer is possible is performed. And checking whether an assignment request message by the call origination of the first subscriber is transmitted to the first subscriber. The method of claim 10, wherein the checking of whether the call transfer is possible is performed. And checking a call processing state of the first subscriber in a paging process or a first call processing process by originating a call of the first subscriber. The method of claim 10, If there is an incoming request for calling the first subscriber by the third subscriber, and an allocation request message has not been sent to the first subscriber, the third subscriber is in an idle state by a third call processing process of the third subscriber. And notifying a message indicating that the message is incomplete. 11. The method of claim 10, wherein the step of converting the call processing procedure to call forwarding, And transmitting a mobile terminated signal to the allocation request message transmitted to the first subscriber. 11. The method of claim 10, wherein the step of converting the call processing procedure to call forwarding, Terminating the call processing process of the first subscriber and executing the incoming call processing process.