KR19980061817A - Control Method of Continuous Handoff Period in Switching Mobile Communication Switch - Google Patents

Abstract

In the present invention, when a mobile subscriber moves to an area controlled by another exchange during an outgoing or incoming call from a mobile communication exchange (hereinafter, referred to as an exchange), a call currently in progress is moved. The present invention relates to a method for continuous handoff control of a switching period in a serving mobile communication switch, which is suitable for maintaining a call path to a mobile communication switch. In a conventional public switched telephone network (PSTN), a mobile call processing and mobility for a mobile subscriber is provided. Although there is a drawback that there is no management and handoff control technique, in the present invention, when a mobile subscriber moves to a third exchange and then moves to a third exchange in a mobile communication exchange, the call is transferred to a call in progress. Keeps track of calls, prevents disconnection of busy calls, and improves call quality By providing a service, it is possible to improve the aforementioned drawbacks.

Description

Control Method of Continuous Handoff Period in Switching Mobile Communication Switch

In the present invention, when a mobile subscriber moves to an area controlled by another exchange during an outgoing or incoming call from a mobile communication exchange (hereinafter, referred to as an exchange), a call currently in progress is moved. The present invention relates to a method of controlling a switching period continuous handoff in a serving mobile communication switch that maintains a communication path for a service.

The mobile switching center is capable of providing mobile call processing to mobile subscribers, as well as switching to wired subscribers provided by existing public switched telephone networks (PSTN) or integrated service digital networks (ISDN). Functions such as mobile line management are essential, and when a mobile subscriber moves to an area controlled by another system during a call, a handoff function has become important to maintain continuity of a call currently being called.

The conventional public switched telephone network has the drawback that there is no mobile call processing, mobility management and handoff control techniques for mobile subscribers.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and when a mobile subscriber moves from a mobile communication switch to an area controlled by another exchange during a call and then moves back to a third exchange, a call for an ongoing call It is an object of the present invention to provide a method for continuous handoff control of an exchange period in a serving mobile communication exchange which prevents disconnection of a busy call by maintaining a communication path.

In order to achieve the above object, the present invention provides a base station controller matching unit that is responsible for matching with the base station controller in the serving exchange connecting the handoff and operation management for the relay line, and another exchange connected to the other exchange in the serving exchange. The call processing control unit controls the matching unit, mobile call processing and mobility management, and controls the base station controller matching unit and the other switching unit matching unit, and is responsible for the handoff, and controls the base station controller matching unit and the other switching unit matching unit. A handoff control method comprising: a handoff control unit; and a switch connection unit connecting a subscriber through a switching operation and connecting a new call path. Is sent to the serving exchange side and the handoff of the serving exchange is The controller analyzing the target cell information in the message to determine that the exchange is a continuous handoff; Sending a Handoff To Third Invoke message including the target cell information to the anchor exchange to receive a Handoff To Third Retrun message for the continuous handoff; A first judging step of receiving a continuous handoff result message from the handoff control unit of the serving exchange to determine whether handoff is possible; If the handoff is impossible as determined in the first judging step, ending the handoff control process and transitioning to a handoff busy state during the exchange period; If the handoff is possible in the first judging step, performing the handoff; A second determination step of determining whether the handoff is successful in the handoff controller of the serving exchange; As a result of the determination in the second judging step, in the case of a handoff failure, ending the handoff control process and transitioning to a handoff busy state during the exchange period; As a result of the determination in the second judging step, if the handoff is successful, the step of changing and terminating the information of the subscriber according to the handoff success is provided. do.

1 is a block diagram of a serving mobile communication exchange that can accommodate a method for continuous handoff control between exchanges according to the present invention;

2A to 2B are control flowcharts of a serving mobile communication exchange in a method for handoff control continuously between exchanges according to the present invention;

* Description of the symbols for the main parts of the drawings *

100: call processing control unit 102: handoff control unit

104: base station controller matching unit 106: other exchange matching unit

108: switch connection

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 shows a system internal configuration for continuous handoff control during an exchange period in a serving mobile communication exchange.

The base station controller matching unit 104 is responsible for matching with the base station controller and operation management of the relay line, and distributes the received message to the call processing control unit 100 or the handoff control unit 102 according to the type.

The call processing control unit 100 is in charge of overall control of mobile call processing and mobility management, and is connected to another switch matching unit 106 in connection with a call to control a call received and transmitted from another station, and the base station controller matching unit ( 104, and the call and handoff to the outside function, and is connected to the switching connection unit 108 to control the switching connection to handle the connection between the subscriber.

The handoff genre unit 102 is responsible for the control of the handoff and the switch connection control for the handoff for the new call path through the switch connection unit 108.

The base station controller matching unit 104 is connected to the base station controller and is responsible for matching with the base station controller, and receives and transmits the matched signal.

The other exchange matching unit 106 is No. 7 Send and receive matching messages between counterpart exchanges and stations of other stations through signal link.

The switch connection unit 108 performs a switching connection operation to the base station controller matching unit 104 or another switch matching unit 106 under the control of the handoff control unit 102 and the call processing control unit 100.

Fig. 2 shows a process flow for the exchange duration continuous handoff control in the handoff control unit in the serving exchange.

The mobile subscriber moves to the area controlled by the other exchange during the call and then moves to the area controlled by the third anchor exchange (step 200).

The serving base station controller sends a Handoff Required query to the exchange serving exchange side (step 202).

The handoff control unit 102 of the serving exchange analyzes the target cell information in the message to determine and recognize that it is a continuous handoff between the exchanges (step 204).

A handoff to third invoke message including the target cell information is sent to the anchor exchange through the other exchange matching unit 106 (step 206).

Then wait for the result of the continuous handoff from the anchor exchange (step 208).

A Handoff To Third Retrun message is received from the anchor exchange through the other exchange matching unit 106 (step 210).

The handoff control unit 102 of the serving exchange receives the successive handoff result message to determine whether handoff is possible (step 212).

If it is determined in step 212 that handoff is impossible, a handoff reject message including a cause of failure is sent to the serving base station controller (step 214).

The handoff control process is terminated and the state transitions to the handoff busy state during the exchange (216).

If it is determined in step 212 that the handoff is possible, a handoff command message is sent to the base station controller through the serving base station controller matching unit 104 (step 218).

Wait in the handoff ongoing state (step 220).

The serving base station receives a Handoff Commenced that the UE is currently performing handoff (step 222).

Wait for the result of performing the handoff (224).

Receive a Facilityities Invoke message from the anchor exchange (226).

The handoff control unit 102 of the serving exchange determines whether the handoff is successful by referring to the message received in step 226 (step 228).

As a result of the determination in step 228, in the case of a handoff failure, the handoff control process is terminated, and the state transitions to the handoff call during the exchange period (step 230).

As a result of the determination in step 228, if the handoff is successful, the handoff incoming line connected to the anchor exchange is released, and the switch connected to the serving base station controller is released (step 232).

The base station controller matching unit 104 sends a clear request message for radio resources associated with the call to the serving base station controller (step 234).

Wait for the radio resource release request result (step 236).

A radio resource release result (Clear Complete) message is received from the serving base station controller (step 238).

The serving exchange deletes the handoff related information for the mobile subscriber (step 240).

End of the handover control process of the exchange period in the serving interceptor is terminated, and is excluded from the call service state.

As described above, the present invention maintains a call path by continuously maintaining a call path for an ongoing call when the mobile subscriber moves to a third exchange and then moves to a third exchange in a mobile communication exchange. It is effective in preventing call disconnection, providing better call quality service, and managing mobile subscriber's mobility in real time.

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 (4)

A base station controller matching unit 104 in charge of matching with the base station controller in the serving exchange connecting the handoff and managing operations for the relay line; Another exchange matching unit 106 connected to the other exchange in the serving exchange, the mobile call processing and control of the mobility management, the call processing to control the base station controller matching unit 104 and the other exchange matching unit 106 The control unit 100 and the handoff control unit 102 that controls the handoff and controls the base station controller matching unit 104 and the other exchange matching unit 106, and connects the subscribers through a switching operation. In the serving mobile terminal of the switching period continuous switchoff consisting of a switch connection unit 108 for connecting a new communication path, Receiving a handoff capable query (Handoff Required) message from the serving base station controller, the handoff control unit 102 of the serving exchange analyzes the target cell information in the message and determines that it is a continuous handoff between the exchanges; Sending a Handoff To Third Invoke message including the target cell information to the anchor exchange to receive a Handoff To Third Retrun message for the continuous handoff; A first judging step of determining whether a handoff is possible by receiving a continuous handoff result message from the handoff control unit 102 of the serving exchange; If the handoff is impossible as determined in the first judging step, ending the handoff control process and transitioning to a handoff busy state during the exchange period; If the handoff is possible in the first judging step, performing the handoff; A second determination step of determining whether the handoff is successful in the handoff controller 102 of the serving exchange; As a result of the determination in the second judging step, in the case of a handoff failure, ending the handoff control process and transitioning to a handoff busy state during an exchange period; Changing and terminating the subscriber's information according to the handoff success if the handoff is successful as a result of the determination in the second judging step; The method of claim 1, If it is determined in the first determination step that handoff is impossible, Sending a Handoff Reject message including a cause of the failure to the serving base station controller; And ending the handoff control process and transitioning to a handoff busy state during a switching period. The method of claim 1, If the handoff is possible in the first judging step, proceeding with the handoff, Sending a handoff command message to the base station controller through the base station controller matching unit 104; Receiving a result message and receiving a notification from the serving base station controller that the terminal is currently performing handoff (Handoff Commenced); Waiting for a result of performing a handoff, and receiving a facility release invoke message from an anchor exchange. The method of claim 1, As a result of the determination in the second judging step, when the handoff is successful, the changing of the subscriber information according to the handoff success may include: Releasing a handoff incoming line connected to the anchor exchange and releasing a switch connected to a serving base station controller; Transmitting a Clear Request message of a radio resource associated with the call to the serving base station controller through the base station controller matching unit 104; Waiting for the radio resource release request result, and receiving a radio resource release result (Clear Complete) message from the serving base station controller; The serving exchange further comprises the step of deleting the handoff related information for the mobile subscriber of the switching period continuous handoff control method in the serving mobile communication switch.