KR100186982B1 - Hand-off method between mobile communication switching system - Google Patents

Abstract

The present invention relates to a mobile communication system for easily testing a forward handoff function in a serving exchange using a handoff occurrence and control for generating and controlling a handoff between exchanges provided in an exchange, The handoff control method of a mobile switching center according to claim 1, wherein the mobile switching center sets an outgoing call according to the handoff occurrence of the serving exchange and the outgoing call setup request of the control unit and the control station matching unit, Wherein the handoff occurrence and control device analyzes the information of the data of the serving exchange and the target exchange to forward the data to the target exchange in response to the response message received in the first step, A second step of transmitting a handoff request message, A third step in which a handoff occurrence of a target switching station that has received the forward handoff request message and a control message transmitted to the handoff request to the serving exchange after the controller performs processing required for the handoff control, A fourth step of releasing the wireless resource information allocated through the handoff control unit, the control station matching unit and the handoff occurrence and control unit of the serving exchange after receiving the response message transmitted in the step 4; And a fifth step of completing a handoff between the serving exchange and the target exchange by connecting newly allocated radio resources of the target exchange with the release of the resource information.

Description

Handoff method between mobile communication exchanges

FIG. 1 is a general configuration diagram of a mobile communication system in which a handoff occurrence and control device for a handoff function test of the present invention is located; FIG.

FIG. 2 is a block diagram of a mobile communication system switching center in which a handoff occurrence and control device for a handoff function test of the present invention is located; FIG.

FIG. 3 is a flow chart of a handoff occurrence process and a handoff process procedure of a switching station by a control apparatus according to the present invention. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: base station 20: control station

21: call processing unit 30:

31: handoff occurrence and control device 32:

33: mobile station control unit 34: hand-

35:

The present invention relates to a mobile communication system using CDMA, including a handoff generation and control device for generating and controlling a forward handoff between exchanges in a switching center, And more particularly, to a handoff method between a mobile communication exchange that can easily test a forward handoff function between exchanges at a serving exchange by processing a forward handoff at a serving exchange using a forward handoff occurrence signal and a control signal .

Generally, a CDMA mobile communication system transmits and receives a message to and from a mobile station that moves in an unspecified area, as a communication between mobile bodies that can communicate with anytime, anywhere, A control station that controls the base station and transmits and receives messages to and from the base station, and an exchange that performs a switching role in conjunction with the control station, the other station, and the other network.

One of the most important and important features of the mobile communication system is to secure the mobility of the subscriber station of the mobile station, and location registration and handoff techniques are required to guarantee the mobility of the subscriber.

The location registration is a processing procedure for notifying the base station of various characteristics of the mobile station, such as the mobile network in which the mobile station is located, and the status of the mobile station, and the handoff technique can be continuously performed even when the mobile station leaves the service area of the base station or sector, Is a technique for switching the communication path between the mobile station and the base station so that the call can be maintained.

In the handoff scheme, there is a soft handoff, which is a handoff between adjacent base stations using the same frequency, and a hard handoff, which is a handoff between a base station and an exchange using different frequencies. The handoff function was tested to find a more efficient way of performing the off-time.

In particular, when testing the hard handoff function between exchanges, the exchange is located far away from the mobile network, so that the user of the mobile station moves directly from the area under the control of one exchange to the area under the control of another exchange to generate a hard handoff , And tests the handoff function by performing a hard handoff between the exchanges using the generated hard handoff request signal and the control signal output from the mobile station.

However, the hard handoff request signal between the exchanges necessary for testing the hard handoff function as described above requires a person to directly ride the car and generate an area in the opposite direction, which is troublesome to move the area, It takes too much manpower, equipment, and time to generate a handoff, which leads to ineffective testing of the handoff function development.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a handoff control method and a handoff control method, And the handoff occurrence signal and control signal of the control apparatus are used to handle the forward handoff at the serving exchange station, so that a lot of personnel, equipment and time The present invention relates to a handoff method between mobile communication exchanges,

In order to achieve the above object, a handoff method between mobile communication exchanges according to the present invention includes a handoff generation and control device for generating a forward handoff between exchanges in a switching center and performing processing and control functions according to the generated handoff When a call is established and a mobile station in the serving exchange station area in the call moves to another exchange station, that is, a target exchange station area, a forward handoff occurrence signal generated from the serving exchange station is transmitted to the serving exchange station through the handoff occurrence and control negotiation And a forward handoff process is performed between the serving exchange and the target exchange by allowing the handoff occurrence and control device to perform a forward handoff process at the serving exchange station so as to test the forward hard handoff function between the exchanges.

Hereinafter, a handoff method between mobile communication exchanges of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a general configuration of a mobile communication system in which a handoff occurrence control and control device for a handoff function test according to the present invention is located. The control station 20 and the switching center 30, in which a base station 10 and a call processing section 21 are constituted, In the mobile communication system of the present invention, in the mobile switching center 30, a handoff generation and control device 31 for generating and controlling a forward hard handoff signal between exchanges is connected to a mobile station processing unit 35 .

The handoff occurrence and control device 31 generates a forward hard handoff signal of the serving exchange by the movement of the mobile station and informs the serving exchange on behalf of the base station and the control station of the information that the forward hard handoff has occurred Allows the serving exchange to perform processing for forward hard handoff.

FIG. 2 is a block diagram of a mobile communication system switching center in which a handoff generating and controlling device for a handoff function test according to the present invention is located. The switching center sets and maintains an outgoing call, generates a forward hard handoff signal, A handoff generation and control device 31 for controlling the generated forward hard handoff and call, a control station matching part 32 for performing call setup and maintenance functions and performing processing functions necessary for handoff, A mobile station control unit 33 that performs setting and maintenance functions, and a hand-off control unit 34 that performs an operation necessary for hand-off and an interlock function with other exchange stations.

The hand-off generation and control device 31 is loaded into the mobile-number control unit 33 to perform a role of a control station and transmits and receives messages to and from the control-station matching unit 32. [

Referring to FIG. 3, a forward hard handoff method in a serving exchange using a forward handoff occurrence signal output from the handoff occurrence and control device 31 in the mobile communication system switching center having the above- same.

In the present invention, the handoff occurrence and control device generates a forward hard handoff signal, which is a hard handoff that occurs when a mobile station first moves to another switching area during a call.

When a handoff occurs in a state where the mobile station is in transition, the exchange sets the call, and the newly entered exchange is called the target exchange.

Therefore, when a handoff occurs and a control device generates a forward hard handoff as if a call is established and a mobile station in a call moves from a serving exchange to a target exchange, the handoff occurrence and control event is forwarded to a serving hard- Off occurrence, thereby allowing the serving exchange station to perform the processing for the forward hard handoff.

Referring to FIG. 3, the forward hard handoff processing procedure in the serving exchange station will be described. First, the handoff occurrence and control apparatus of the serving exchange transmits the calling subscriber information to the mobile subscriber control unit through the control station matching unit, Requires configuration.

Then, the mobile-station control unit informs that the originating call setup is completed to the control-station matching unit, and notifies the handoff occurrence and control unit through the control station matching unit after setting the origination call with the origination subscriber information generated by the hand- To notify that the outgoing call setup has occurred normally.

Accordingly, the handoff occurrence and control apparatus waits for a response message of the called subscriber to be received.

After the originating call setup is completed, the mobile station control unit normally sets the incoming call with the originating subscriber information transmitted from the handoff occurrence and the control device, and sends a response message to the outgoing call control unit. The mobile station control unit, And sends a called subscriber response message to the originating and controlling device.

Upon receipt of the message, the originating subscriber notifies the originating subscriber of the occurrence of the handoff 10 seconds after recognizing that the handoff occurrence and the control future are in the busy state.

At this time, the handoff occurrence and control device transmits the data of the presently located serving switching station region together with the data of the target switching center to be newly located by the mobile station. If the handoff control information indicates that handoff has occurred for the first time in the handoff control section, the handoff control section determines whether the handoff occurrence and the mobile station transmitted by the control apparatus are newly Analyzes the information of the target switching center of the area to be located, prepares to transmit the message to the target switching center, and transmits the handoff request message to the target switching center when the preparation is completed.

When the handoff controller of the target mobile switching center which has received the message transmits information indicating that the mobile station is located in the base station area of the target mobile switching center to the control station matching part, Off and requests the control device to assign the mobile station's information and a new channel.

After receiving the request message, the handoff occurrence and control allocation performs a necessary step process such as allocating a channel, and then transmits a response message to the control station matching unit. Then, the control station matching unit of the target exchange station performs handoff control And that you are ready for it.

Then, the target handover-off control unit receives the information and transmits a handoff request response message to the serving exchange.

Therefore, the handoff controller of the serving exchange receiving the message indicating that the handoff control is ready, transmits a message to the control station controller to release the channel allocation information, Notifies the device to release the radio resource information, and causes the handoff occurrence and control device to release the radio resource information.

Then, the handoff occurrence of the target switching center and the control device notify the control station matching unit that the wireless connection assigned by the target switching center has been performed, and notify the handoff control unit that the handoff is completed.

Then, the handoff control unit of the target exchange station transmits a message to the serving exchange station that the mobile station is currently located at the target exchange station and the handoff is completed.

Upon receiving the message informing that the handoff is completed, the handoff control unit of the serving exchange notifies the control station matching unit to cancel the process for the handoff, and the control station registration unit issues a call control process to the control device Ask them to release it.

Thus, the handoff occurrence and control device can complete the forward handoff of the outgoing call by canceling the call control process, thereby testing the forward hard handoff function between the serving exchange and the target exchange.

As described above, according to the present invention, since the mobile station does not directly move to test a function of generating a handoff signal and can test the handoff function of the exchange period through a handoff occurrence and control device, In the overall development of the CDMA mobile communication system, there is an advantage that it can efficiently test by reducing a lot of manpower, time, and equipment.

Claims (1)

In a mobile communication system composed of a mobile station, a base station 10, an exchange station 30 including a control station 20 and a control station matching unit 32, a mobile station control unit 33, a handoff control unit 34, And a handoff occurrence and control device (31) for generating a forward hard handoff signal between the exchanges in the exchange and performing a processing function in accordance with the generated forward hard handoff, A first step of setting an outgoing call by a mobile station control unit according to a control disposition and an outgoing call setup request of a control station matching unit and receiving the response message of the called subscriber by the handoff occurrence and control unit; The handoff occurrence and control device analyzes the information of the data of the serving exchange and the target exchange, A second step of receiving a handoff request message; and a handoff occurrence and control device of a target switching center, which has received the forward handoff request message of the second step, performs a handoff control, A third step of receiving a response message transmitted in the third step and transmitting a response message to the handover control part, the control part matching part and the handoff occurrence control part of the serving exchange, And a fifth step of completing a handoff between the serving exchange and the target exchange by connecting the newly allocated wireless resources of the target switching center according to the release of the wireless binding information of the fourth step, And a forward hard handoff function at the mobile switching center.