KR19980061821A - Base Station Control Period Handoff Control Method in Mobile Communication Switch - Google Patents

Abstract

In the present invention, when a mobile subscriber moves to an area controlled by another base station controller during an outgoing or incoming call in a CDMA mobile communication exchange (hereinafter referred to as an exchange), The present invention relates to a base station control period handoff. In the related art, as well as a switching function for wired subscribers provided by an existing public switched telephone network (PSTN) network or an integated service digital network (ISDN), In addition, the present invention has a drawback in that it cannot provide functions such as mobile call processing function and mobility management for mobile subscribers. However, the present invention prevents disconnection of a call by continuing to maintain a call path for an ongoing call and provides a better call quality service. Real-time management of mobile subscribers As such, it may help improve the above drawbacks.

Description

Base Station Control Period Handoff Control Method in Mobile Communication Switch

In the present invention, when a mobile subscriber moves to an area controlled by another base station controller during an outgoing or incoming call in a CDMA mobile communication exchange (hereinafter referred to as an exchange), A base station control period handoff.

The exchange is not only a switching function for wired subscribers provided by a public switched telephone network (PSTN) network or an integated service digital network (ISDN) but also a mobile call processing function for a mobile subscriber, mobility management, etc. There was a flaw in not providing the functionality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and when a mobile subscriber moves to an area controlled by another base station controller during an outgoing or incoming call at an exchange, the call is maintained by continuously maintaining a call path for an ongoing call. It aims to prevent disconnection of an ongoing call, to provide better traffic quality service, and to manage and provide mobility of a mobile subscriber in real time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and includes a base station controller matching unit in a switch which is responsible for matching the base station controller and the switch that controls the mobile call and operation management of the relay line, A call processing control unit for controlling mobility management and controlling each base station controller matching unit, a handoff control unit for controlling control of each base station controller matching unit, and a call processing control unit and handoff A base station control period handoff control method in a mobile communication switch comprising a switch connection unit which connects between subscribers through a switching operation and connects a new communication path under the control of a control unit, wherein the mobile subscriber is controlled by another base station controller during a call. The base station controller DE determining possible to send off contact (Handoff Required) message toward the exchange, the handoff control unit of the exchange target cell information analyzed by the base station control period of a hand-off in a message that determines a target base station controller; Occupies one of the available relay lines among the relay lines connected to the target base station controller for message transmission and call setup, and sends a handoff request message including the target cell information to the target base station controller and sends a handoff request to the target base station controller. Receiving a Handoff Request Ack message; A first judging step of determining whether handoff is possible in the exchange receiving the result message for the handoff request; As a result of the determination in the first determination step, handoff processing if handoff is possible; A second determination step of determining whether the handoff is successful by referring to a handoff complete message; In the second determination step, if the handoff is successful, providing a method for controlling a base station control period handoff in a mobile communication switch comprising the step of releasing and terminating resources with the base station controller. There is a purpose.

1 is a block diagram of a mobile communication exchange that can accommodate a base station control period continuous handoff control method according to the present invention.

2A to 2B are flowcharts for explaining a handoff control method in a base station control period handoff control method 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: first base station controller matching unit

106: second base station controller matching unit 108: switch connection unit

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 base station control period handoff control in an exchange.

Each base station controller matching unit 104, 106 is responsible for matching with the base station controller and operation management for 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. Play a role.

The call processing control unit 100 is in charge of overall control of mobile call processing and mobility management.

In addition, the call processing control unit 100 functions to receive or export a call of a local station to each base station controller matching unit 104 or 106 in connection with a call, and is connected to the switch connection unit 108 to control switching connection control. To handle connections between subscribers.

The handoff control unit 102 is responsible for the control of the handoff and the switch connection unit 108 to restore the existing channel and control the switch connection for the handoff for the new channel.

Each base station controller matching unit 104, 106 is connected to a corresponding base station controller and is responsible for matching with the base station controller, and receives and transmits the matched signal.

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

Referring to FIG. 2, FIG. 2 shows a process flow for base station control period handoff control in the intra-switch handoff control unit 102. As shown in FIG.

If the mobile subscriber moves to an area controlled by another base station controller during a call, the base station controller sends a Handoff Required message to the exchange side (steps 200 and 202).

The handoff control unit 102 of the exchange analyzes the target cell information in the message to determine that it is a handoff between base station controllers and determines the target base station controller (step 204).

It occupies one available relay line among the relay lines connected with the target base station controller for message transmission and call setup (step 206).

A handoff request message including the target cell information is sent to the target base station controller determined in step 204 (step 208).

The exchange waits for the result of the handoff request to be received from the target base station controller (step 210).

A Handoff Request Ack message is received via the second base station controller matching unit 106 (step 212).

The handoff control unit 102 of the exchange receiving the result message for the handoff request determines whether handoff is possible (step 214).

If it is determined in step 214 that the handoff is impossible, a handoff reject message including a cause of failure is sent to the serving base station controller (step 216).

The exchange releases the relay line with the pre-occupied target base station controller connected to the target base station controller for message transmission and call setup in step 206 (step 218).

The handoff control is terminated while transitioning to an outgoing or incoming call state (step 220).

If it is determined in step 214 that a handoff is possible, a handoff command message is sent to the serving base station controller (step 222).

The exchange waits in the handoff in progress state (step 224).

The serving base station controller receiving the handoff request request sends a handoff direction to the mobile terminal.

The serving base station controller receives a Handoff Commenced that the UE is currently performing handoff (step 226).

The switch connection 108 secures a handoff switch for the handoff call path to the target base station controller through the second base station controller matching unit 106 (step 228).

Wait for the result of performing the handoff (step 230).

The terminal terminates the handoff and informs the target base station controller that the handoff is complete.

The exchange receives a Handoff Complete message from the target base station controller (step 232).

The exchange determines whether the handoff was successful by referring to the handoff complete message (step 234).

As a result of the determination in step 234, in case of failure, in step 206, the relay line with the target base station controller previously occupied among the relay lines connected to the target base station controller for message transmission and call setup is released (step 236).

Step 228 restores the handoff switch that secured the call path to the target base station controller via switch connection 108 (step 238).

Transitioning to the incoming or outgoing handoff state, the handoff control ends (step 240).

If it is determined in step 234 that the handoff is successful, in step 206, the handoff switch secured to the target base station controller is connected and the call path connected to the serving base station controller is released before the handoff occurs (step 242). .

A Clear Request message for radio resources associated with the call is sent to the serving target base station controller (step 244).

Wait for the release result to be received from the serving base station controller (step 246).

A radio resource release result (Clear Compete) message is received from the serving base station controller from the first base station controller matching unit 104 (step 248).

Registering the handoff related information for the corresponding mobile subscriber including the radio resource release result (Clear Complete) message to the switch (step 250).

The base station control period handoff control process at the exchange is terminated and the next event is waited for in the handoff busy state (step 252).

As described above, the present invention can prevent a disconnection of a call by continuing to maintain a call for a call currently in progress, provide better call quality service, and manage 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 (5)

Switch that controls the mobile call that has occurred (abbreviated as mobile communication switch), each base station controller matching unit 104, 106 responsible for matching with the base station controller and management of the relay line in the switch, and mobile call processing And a call processing control unit 100 for controlling the mobility management and controlling the base station controller matching units 104 and 106, and a control for handoff. The handoff control unit 102 that controls the 104 and 106, and the switch connection unit 108 that connects the subscribers through the switching operation under the control of the call processing control unit 100 and the handoff control unit 102 and connects a new call path In the base station control period handoff control method in a mobile communication exchange consisting of: When a mobile subscriber moves to an area controlled by another base station controller during a call, the base station controller sends a handoff required message to the exchange side, and the handoff control unit 102 of the exchange analyzes target cell information in the message. Determining that the handoff is between the base station controllers and determining a target base station controller; Occupies one of the available relay lines among the relay lines connected to the target base station controller for message transmission and call setup, and sends a handoff request message including the target cell information to the target base station controller and sends a handoff request to the target base station controller. Receiving a Handoff Request Ack message; A first judging step of determining whether a handoff is possible at the exchange receiving the result message for the handoff request; As a result of the determination in the first determination step, handoff processing if handoff is possible; A second determination step of determining whether the handoff is successful by referring to a handoff complete message; And in the second determination step, when the handoff is successful, releasing and terminating the resource with the base station controller, and terminating the base station control period handoff control method in the mobile communication switch. The method of claim 1, If it is determined in step 214 that the handoff is not possible, sending a handoff reject message including a cause of failure to the serving base station controller; The exchange, releasing a relay line with a previously occupied target base station controller connected to the target base station controller; And ending handoff control while transitioning to an outgoing or incoming call state. The method of claim 1, In the first determination step, if the handoff is possible, the handoff process may include: Sending a Handoff Command message to the serving base station controller; Receiving a Handoff Commenced from the serving base station controller that the terminal is currently handoff in progress, the switch connecting unit 108 obtaining a handoff switch for a handoff call path to the target base station controller; And receiving a handoff complete result (Handoff Complete) message from the base station controller. The method of claim 1, In the second determination step, in the case of a handoff failure, releasing a relay line with the target base station controller previously occupied among the relay lines connected with the target base station controller; Restoring the handoff switch secured by the switch connector 108; And terminating handoff control while transitioning to an incoming or outgoing handoff state. The method of claim 1, As a result of the determination in step 234, if the handoff is successful, the step of releasing resources and terminating with all base station controllers, Connecting a handoff switch secured to the target base station controller and releasing a communication path connected to a previous base station controller; Sending a Clear Reuest message of a radio resource associated with the call to a serving base station controller, and then receiving a Clear Resource Complete message; And registering the handoff-related information of the corresponding mobile subscriber included in the radio resource release result (Clear Complete) message to the switch and changing the information. .