KR19980061827A - Method of controlling handoff period during ringback tone in target mobile communication exchange - Google Patents

Abstract

In the present invention, when a mobile subscriber attempts to make a call and receives a ring back tone (hereinafter abbreviated as RBT) in a CDMA mobile communication switch, the mobile subscriber moves to an area controlled by another mobile communication switch. A method for controlling an exchange duration handoff during a ringback tone at a target mobile communication exchange suitable for continuing to maintain the present invention, in the prior art, by providing a handoff service only when the mobile subscriber is busy, In other words, the call of the subscriber receiving the RBT does not provide a handoff service, but the call is disconnected or the call quality is degraded. However, in the present invention, the originating mobile subscriber moves to an area controlled by another exchange while receiving the RBT. If present, the handoff service at the target exchange By preventing the arc line being cut off and provides better voice quality service, it is to improve the above-mentioned drawbacks.

Description

Method of controlling handoff period during ringback tone in target mobile communication exchange

In the present invention, when a mobile subscriber attempts to make a call and receives a ring back tone (hereinafter abbreviated as RBT) in a CDMA mobile communication switch, the mobile subscriber moves to an area controlled by another mobile communication switch. The present invention relates to a switching period handoff control method during ringback tones at a target mobile communication exchange.

Conventionally, by providing a handoff service only when a mobile subscriber is in a busy state, a handoff service is not provided for an ongoing call, that is, a call of a subscriber receiving an RBT. have.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and when the originating mobile subscriber moves to an area controlled by another exchange while receiving an RBT, by providing a handoff service at the target exchange, The purpose is to prevent disconnection and to provide better call quality of service.

In order to achieve the above object, the present invention, a target exchange for receiving a handoff command from the serving exchange and processing the call, a base station controller matching unit responsible for matching and operation management of the relay line with the base station controller in the target exchange, A call processing control unit for controlling mobile call processing and mobility management, controlling a base station controller matching unit, a handoff control unit for controlling handoff, and controlling a base station controller matching unit, a handoff control unit and a call processing control unit Switching period handoff control during the ringback tone of the target mobile communication switch, which is composed of another switch matching unit that matches the connection with other stations under the control of the switch, and a switch connection unit that connects the subscribers through a switching operation and connects a new call path. A method in which a mobile subscriber is in control of another exchange while on a call When the mobile station moves to the service area, it receives a facility commands (Facilities Directive Invoke) message from the serving exchange at the target exchange, and the handoff controller analyzes the target cell information in the message to determine that it is the forward handoff of the exchange period, and determines the target base station controller Making; The result of the handoff request is to occupy an available relay line among the relay lines connected to the target base station controller for message transmission and call setup, and to send a handoff request message including the target cell information to the target base station controller. Receiving a (Handoff Request Ack) message; A first determination step of determining whether a handoff is possible by referring to a result message for the handoff request in the handoff control unit 102 of the target exchange; If the handoff is possible as a result of the determination in the first judgment determination step, performing handoff processing; A second determination step of determining whether the handoff is successful by referring to the handoff result message; Changing the information of the handoff subscriber if the handoff is successful as a result of the determination in the second determination step; A method for controlling a handoff period during an exchange of ringback tones in a target mobile communication switch comprising the steps of completing a handoff by transmitting and receiving a response request and a response between systems.

1 is a block diagram of a target mobile communication exchange inside which can accommodate a switching period continuous handoff control method according to the present invention;

2 is a flowchart illustrating a method for controlling an exchange period handoff during ringback tones in a handoff control unit in a target exchange 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 diagram for switching period handoff control during RBT in a target mobile communication exchange.

The mobile communication exchange includes an anchor exchange controlling a mobile call generated according to the order of handing off a call, at least one serving exchange receiving a handoff from the anchor exchange and connecting to another exchange, and finally receiving a handoff from the serving exchange. It is divided into a target exchanger that handles calls.

In the case of handoff only in two exchange areas, the first exchange is divided into the anchor exchange generated first and the target exchange receiving the exchange.

The call processing control unit 100 is responsible for the overall control of the outgoing mobile call processing.

And, the call processing control unit 100 is connected to the other switch matching unit 106 in relation to the call to control a call received and transmitted from another station, the base station controller matching unit 104 receives a call of its own station or external It functions to export to, and is connected to the switch connection unit 108 to control the switching connection to handle the connection between subscribers.

The handoff control 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 105.

The base station controller matching unit 104 is responsible for matching with the base station controller and operation management for the relay line.

The other exchange matching unit 106 transmits and receives a matching message between the counterpart exchange and the station through the No. 7 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 processing flowchart for the exchange period handoff control during RBT in the handoff control unit in the target exchange.

If the mobile subscriber moves to an area controlled by another exchange during the call, the serving exchange sends a Facilityities Directive Invoke message to the target exchange side (step 200).

The handoff control unit 102 of the target exchange analyzes the target cell information in the message to determine that it is a forward handoff of the exchange period and determines the target base station controller (step 202).

It occupies one available relay line among the relay lines connected with the target base station controller for message transmission and call setup (step 204).

The target exchange sends a handoff request message containing the target cell information to the target base station controller (step 206).

Wait for the result for the handoff request (step 208).

The base station controller matching unit 104 of the target exchange receives a Handoff Request Ack message (step 210).

The handoff control unit 102 of the target exchange determines whether handoff is possible by referring to the result message for the handoff request (step 212).

As a result of the determination in step 212, if a handoff is not possible, a facilities directive return message including a cause of failure is sent to the serving exchange (step 214).

In step 204, the relay line with the newly occupied target base station controller is released (step 216).

Then, the handoff control ends.

As a result of the determination in step 212, if a handoff is possible, a Facilityities Directive Return message is sent to the serving exchange (step 218).

The serving exchange occupies the designated incoming line for handoff (step 220).

Then, the result of performing the handoff is waited for (step 222).

The serving exchange sends a Handoff Command message to the serving base station controller.

The serving exchange receives a Handoff Commenced from the serving base station controller (not shown) that the terminal is currently handing off.

The terminal then sends a handoff complete message to the target base station controller.

A handoff complete result (Handoff Complete) message is received from the target base station controller (step 224).

The handoff control unit 102 of the target exchange determines the handoff success by referring to the handoff result message (step 226).

As a result of the determination in step 226, in case of a handoff failure, the relay line with the newly occupied target base station controller is released (step 228).

In step 220, the incoming line for handoff connected to the serving exchange occupied is released (step 230).

Then, the handoff control ends.

As a result of the determination in step 226, if the handoff is successful, the serving exchange is notified to the serving exchange through the Mobile On Channel Invoke message (step 232).

The target exchange connects the secured handoff call path to the target base station controller and provides an RBT (step 234).

The handoff related information for the mobile subscriber is registered with the target exchange (step 236).

In the Ring Back Tone state, the called party waits for a response (step 238).

The target exchange then receives an Inter System Answer Invoke message from the serving exchange (step 240).

A call connect notification message is sent to the target base station controller indicating that the called subscriber has responded (step 242).

The target base station waits for a call connection result to be received (step 244).

A Connect Ack message is received from the target base station controller through the base station controller matching unit 104 (step 246).

An Inter System Answer Return Result message is sent to the serving exchange through the other exchange matching unit (step 248).

The exchange period handoff control process during the RBT at the target exchange is terminated, and the next event is waited for in the handoff busy state (step 250).

As described above, the present invention provides a handoff service at a target exchange when an originating mobile subscriber moves to an area controlled by another exchange while receiving an RBT, thereby preventing a disconnection of an ongoing call and providing a better call quality service. to provide.

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 (6)

A target exchange receiving a handoff command from a serving exchange connecting the handoff, and processing a call; a base station controller matching unit 104 in charge of matching with a base station controller at the target exchange and operation management of a relay line; Call processing control unit 100 that controls the processing and mobility management, and controls the base station controller matching unit 104, and controls the handoff, and controls the base station controller matching unit 104 A handoff control unit 102, an exchange matching unit 106 that matches the connection with other stations under the control of the handoff control unit 102 and the call processing control unit 100, and connects the subscribers through a switching operation; In the switching period handoff control method during a ringback tone in a target mobile communication exchange consisting of a switch connection unit (108) for connecting a new communication path, When the mobile subscriber moves to an area controlled by another exchange during a call, the target exchange receives a Facilityities Directive Invoke message transmitted from the serving exchange and the handoff controller 102 analyzes target cell information in the message. Determining a forward handoff of the switching period and determining a target base station controller; Occupies a usable relay line among relay lines connected to the target base station controller for message transmission and call setup, and sends a handoff request message including target cell information to the target base station controller to send a handoff request. Receiving a Handoff Request Ack message; A first determination step of determining, by the handoff control unit 102 of the target exchange, whether a handoff is possible by referring to a 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 result message; Changing the information of the handoff subscriber if the handoff is successful as a result of the determination in the second determination step; And transmitting and receiving a response request and a response between the systems to complete the handoff. The method of claim 1, If a handoff is not possible as a result of the determination in the first determination step, sending a Facilityities Directive Return message including a cause of failure to the serving exchange; And releasing the relay line with the target base station controller occupied, and ending the handoff control. The method of claim 1, The handoff process may include: Sending a Facilityities Directive Return message to the serving exchange; Occupying a handoff incoming line designated by the serving exchange; Waiting for a handoff execution result, and receiving a handoff complete message; wherein the switching period handoff control method is performed during a ringback tone in the target mobile communication exchange. The method of claim 1, As a result of the determination in the second judging step, if the handoff fails, Releasing a relay line from the newly occupied target base station controller; And releasing and terminating the handoff incoming line which is connected to the serving exchange occupied in step 220, and ending the ring back tone in the target mobile communication exchange. The method of claim 1, As a result of the determination in step 226, the step of registering the handoff when the handoff is successful, Notifying the serving exchange via a Mobile On Channel Invoke message that the handoff has been normally performed; The target exchange connecting the handoff call path secured to the target base station controller to provide an RBT; And registering the handoff-related information for the corresponding mobile subscriber at the target exchange. The method of claim 1, Sending and receiving a response request and response between systems to complete the handoff, Waiting for a called party to respond in a ring back tone state; Receiving an Inter System Answer Invoke message from the exchange; Receiving through the base station controller matching unit 104 a call connection notification message informing that the called subscriber has answered; Transmitting an Inter System Answer Return Result message to the serving exchange through another exchange matching unit (106); Terminating the exchange period handoff control process during the RBT at the target exchange, and waiting for the next event in the handoff busy state; .