KR100214121B1 - Handoff processing method for emergency call in the mobile communication exchanger - Google Patents

Abstract

The present invention relates to a method for handling when there is no handoff relay line available for handoff in a busy state after setup of an emergency call. If there is no relay line available when moving to another cell, if the mobile terminal fails to handoff normally and the power level becomes 0, the terminal that was on the call is released due to handoff during the use of the wireless telephone. In many cases, the telephone call is interrupted. However, in the present invention, when a call is attempted in a wireless mobile communication, when an emergency call is made by setting a subscriber subscriber status flag, the call is handed off so that the call is not disconnected during handoff. Increased success rate provides seamless, uninterrupted wireless mobile phone service during handoff of emergency calls. As a result, the aforementioned drawbacks can be improved.

Description

Handoff Handling Method for Emergency Call in Mobile Communication Switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handoff processing method for an emergency call, and more particularly to a handoff processing method for an emergency call when there is no handoff relay line.

The handoff function in a mobile communication exchange is to maintain a call continuously without releasing the call when the mobile subscriber is moved from one busy state to another cell by movement. In the existing mobile communication exchange, when the handoff function is performed, if there is no relay line that can be used as a congestion of the handoff relay line, the handoff process cannot be performed, and only the handoff process message is transmitted to the subscriber's terminal. . The same applies to the performance of the Bae Sang Ho, such as 112 and 119.

An object of the present invention is to provide a handoff processing method for handoff processing when a handoff request is made for an emergency call when a handoff relay line is in a congested state.

In order to achieve the above object, the present invention is connected to a plurality of base stations having a plurality of relay lines and a handoff relay line for accommodating a personal mobile subscriber, a plurality of base station controllers for controlling a plurality of base stations, and a plurality of base station controllers A mobile communication system comprising a plurality of exchanges connecting individual portable communication subscribers to each other, and a home location register which receives and stores subscriber information from the plurality of exchanges, wherein the handoff processing is required if a predetermined handoff process is required for a predetermined subscriber station. A first step of checking whether a dragon relay line exists; A first handoff processing step of performing normal handoff processing when the handoff relay line exists as a result of the check in the first checking step; A second checking step of checking the status flag when the handoff relay line does not exist as a result of the checking in the first checking step; Stopping the handoff process if it is not an emergency call mode as a result of checking the state flag; Retrieving status flags of subscribers connected to the handoff relay line in the emergency call mode as a result of checking the status flag; Releasing a relay line for handoff of one of the subscribers whose status flag is set to the normal call mode as a result of the search; And a second handoff processing step of allocating the released relay line to a handoff relay line of the predetermined subscriber who requested the removal of the handoff, and performing handoff processing. It provides a handoff processing method for.

1 is a schematic block diagram of a personal mobile communication system for explaining an example of an emergency call handoff process in a personal mobile communication according to the present invention;

2 is a flowchart illustrating a step of establishing an emergency call in a mobile communication system according to the present invention.

3 is a flowchart illustrating a step of performing an emergency call handoff process in a mobile communication system according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10-1, 10-2, 10-n: 1st, 2nd, Nth base station

20-1, 20-2, 20-n: 1st, 2nd, Nth base station controller

30-1, 30-2, 30-n: 1st, 2nd, Nth mobile communication switch

32-1, 32-2, 32-n: VLR40: HLR

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

First, referring to FIG. 1, FIG. 1 is a block diagram of a mobile communication system for explaining an embodiment of a ranking handoff processing method. Each of the first, second, and Nth base stations 10-1, 10-2, ..., 10-n) wirelessly access the personal mobile communication subscriber of the corresponding area, and request authentication of the use of the terminal.

The first, second, and N-th base station controllers 20-1, 20-2, ..., 20-n are connected to a plurality of base stations, and control the base stations to wirelessly receive signals from the base stations and to receive the received signals. To control the process of processing, one base station controller controls a plurality of base stations.

The first, second, and Nth mobile communication exchanges 30-1, 30-2, ..., 30-n are connected with a plurality of base station controllers, and one mobile communication exchange controls a plurality of base station controllers. .

Each visited subscriber management block (32-1, 32-2, ..., 32-n) is located inside each of these multiple mobile switching centers to receive and temporarily store information from a plurality of subscribers. It acts like a database and, for example, if a temporarily registered subscriber has moved elsewhere, this subscriber information is destroyed, and if a new subscriber has entered, it is removed from the home location register (HLR) 40. Receive and store this information.

Each home location register 40 communicates with each of the first, second, and Nth mobile communication exchanges 30-1, 30-2, ..., 30-n, and each of the first, second, respectively. , Each visited subscriber management block 32-1, 32-2, ..., 32-n inside the N-th mobile communication exchange 30-1, 30-2, ..., 30-n. It also gives and receives subscribers' information and contains the subscriber's code and number and information of the subscriber's emergency or normal call according to the present application.

Referring to FIG. 2, a method of registering a handoff for an emergency call in a mobile communication system is as follows.

A subscriber requests an emergency call to a mobile communication switch through a base station and a base station controller through a wireless mobile communication terminal (step 200).

The mobile communication exchange receiving this forms a subscriber's status flag in the visited subscriber management block. The state flag is generated in the corresponding base station as, for example, call_sta_flag set (normal, emergency) (step 202).

Once the subscriber's status flag has been formed, the number transmitted by the calling subscriber is translated by the mobile switching center (step 204).

The mobile communication exchange determines whether the number translated in step 204 is an emergency call registered in the exchange (step 206).

If it is determined that the call is an emergency call in step 206, the subscriber status flag generated in the step 202 is set as an emergency call (step 208).

If it is determined in the step 206 that the call is normal, the subscriber state flag generated in the step 202 is set as the normal call (step 210).

Referring to FIG. 3, a method of handoff processing for an emergency call in a mobile communication system is as follows.

After the above procedure, when the subscriber moves to another cell in the busy state, the handoff process is started.

Once the handoff process is initiated, the base station to which the handoff request at the subscriber mobile communication terminal receives the handoff process receives the handoff request at the base station previously served (step 300).

In the handoff process, before determining whether the handoff relay line is available or not, information about the subscriber is previously received from the base station and retrieved. In particular, the status flag of the subscriber is checked in order to perform the handoff process for the emergency call according to the present application (step 302).

The base station determines whether the subscriber's status flag is an emergency call (step 304).

If it is determined in step 304 that the call is not an emergency call, that is, in the case of the normal call, it is determined whether the available relay line is available in the handoff process (step 306).

As a result of the determination in step 306, if there is no relay line available in the handoff process, a handoff failure message is transmitted (step 308).

If it is determined in step 304 that the subscriber status flag is an emergency call, it is determined whether the handoff trunk of the base station is available (step 310).

If the handoff trunk is available in step 310, the handoff process is performed using an empty handoff trunk (step 312).

If it is determined in step 310 that the handoff trunk of the base station is available and is determined to be unavailable, the call register for the corresponding relay line is searched (step 314).

As a result, the handoff trunk of the relay line occupied first, i.e., the subscriber who has been calling for the longest time, among the subscriber status flags of the normal call is released (step 316).

The handoff trunk occupied by the subscriber released in step 316 is allocated to handoff processing of the subscriber whose subscriber status flag is non-call (step 318).

The handoff process is normally performed for the mobile subscriber (step 312).

Once the handoff process is complete, the call can continue to continue the call.

As described above, in the wireless mobile communication, if a handoff for an emergency call is required in a handoff relay line congestion state, the handoff processing method of releasing and allocating a subscriber relay line occupying the handoff relay line is first performed. By providing this, there is an effect that can increase the handoff success rate for non-call.

The principles of the invention have been described above in connection with specific devices, which are described by way of example only, and are not limited to the spirit of the invention as described in the appended claims.

Claims (2)

A plurality of base stations having personal relay subscribers with a plurality of relay lines and handoff relay lines, a plurality of base station controllers controlling a plurality of base stations, and a plurality of base station controllers connected to a plurality of base station controllers to connect personal portable subscribers to each other A mobile communication system comprising an exchange and a home location register for receiving and storing subscriber information from a plurality of exchanges, A first checking step of checking whether a handoff relay line exists if a handoff is required for a predetermined subscriber station; A first handoff processing step of performing normal handoff processing when the handoff relay line exists as a result of the check in the first checking step; A second checking step of checking the status flag when the handoff relay line does not exist as a result of the checking in the first checking step; Stopping the handoff process if it is not an emergency call mode as a result of checking the state flag; Retrieving status flags of subscribers connected to the handoff relay line in the emergency call mode as a result of checking the status flag; Releasing a relay line for handoff of one of the subscribers whose status flag is set to the normal call mode as a result of the search; And a second handoff processing step of allocating the released relay line to a handoff relay line of the predetermined subscriber who has requested the handoff processing, to perform handoff processing. How to handle handoff. The method of claim 1, And the step of releasing the relay line of the subscriber occupying the relay line first among the subscribers whose state flag is set to the normal call mode.