KR20000042905A - Method of managing connection for supporting hand-over in atm exchange system - Google Patents

Abstract

PURPOSE: A method of managing connection for supporting a hand-over in an asynchronous transfer mode(ATM) exchange system is provided to prevent lowering of a call quality, which is caused by momentarily intercepting of a traffic channel to be generated in hand-over, when a cellular phone requests the ATM exchange system for setting up of a connection, and to enable of a soft hand-over for a lower link direction. CONSTITUTION: A method of managing connection for supporting a hand-over in an asynchronous transfer mode(ATM) exchange system contains processes. The first process is to set up a single directional point to multiple point connection, for a transmitting and incoming party port when requesting for setting up of a wireless connection, and to register multicast information according to the setup connection. The second process is newly to set up single direction and multi direction point connections, to a port to be handed over, and to register the multicast information additionally. The third process is to delete a connection setup before applying a hand-over and the multicast information, in ending hand-over.

Description

Connection management method to support hand-over in A.M.M exchange system

The present invention relates to an asynchronous transfer mode (ATM) switching system, and more particularly, to a connection management method for preventing a traffic channel from being disconnected during hand-over when using an ATM switching system as a wireless service network.

1 is a diagram illustrating a wireless connection state and a wired connection state in an ATM (Asynchronous Transfer Mode) exchange system. As shown in FIG. 1, the ATM switch 100 and 200 may be used as one component of a wireless service network. When the wireless connection is established in the ATM switch 100, the disconnection process of the traffic channel, which may occur during hand-over, will be described with reference to FIG. 2.

2 illustrates an example of a wireless connection setting in an ATM switching system. In the following description, a link from a mobile terminal to a network is defined as an uplink (A) and vice versa as a downlink (B). Referring to FIG. 2, first, it is assumed that port 1 102 is a port used by the mobile terminal before the hand-over, and it is assumed that port 3 106 is a port used by the mobile terminal after the hand-over. Under this assumption, a point-to-point connection before hand-over is made between port 1 102 and port 4 108. If a hand-over occurs in this state, the information of the downlink connection registered in the port 4 108 is transmitted to the port 4 108 to send traffic in the downlink (B) direction to the port 3 106 to be handed over. To port 3 (106). At this time, instantaneous traffic can be cut off, which leads to deterioration in call quality.

Accordingly, an object of the present invention is to provide a connection management method capable of maintaining optimal call quality when using an ATM switching system as a wireless service network.

Another object of the present invention is to provide a connection management method that can prevent the disconnection of traffic channels that may occur during hand-over when using an ATM switching system as a wireless service network.

The present invention for achieving the above object is a connection management method in an asynchronous transmission mode switching system,

A first step of establishing a one-way point-to-multipoint connection at the source and destination ports and registering the multicast information according to a request for establishing a wireless connection;

A second step of newly establishing a one-way point-to-multipoint connection to the port to be handed over and additionally registering multicast information;

And a third process of deleting only the connection and multicast information set before the hand-over upon hand-over completion.

1 is a diagram illustrating a wireless connection and a wired connection in an ATM (Asynchronous Transfer Mode) exchange system.

2 is a diagram illustrating a wireless connection setting in an ATM switching system.

3 is a connection management flowchart of an ATM switching system according to an embodiment of the present invention;

4 is a flowchart illustrating a wireless connection setting according to an embodiment of the present invention of FIG. 3.

5 is a flowchart illustrating connection management during hand-over according to an embodiment of the present invention.

6 is an exemplary connection diagram set by FIGS. 4 and 5;

Hereinafter, an operation according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a connection management flow diagram in an ATM switching system according to an exemplary embodiment of the present invention, and FIG. 4 is a flowchart illustrating a wireless connection setting according to the exemplary embodiment of the present invention. FIG. 5 is a flowchart illustrating a connection management during hand-over according to an embodiment of the present invention, and FIG. 6 is a diagram illustrating an example of the connection set by FIGS. 4 and 5, respectively.

First, the connection management method in the hand-over according to an embodiment of the present invention, when receiving a connection setting request from another system (mobile terminal, BSC, MSC, ...), the existing connection management when the setting request is a wired connection In this way, a bidirectional one-to-one connection is established, and in a wireless connection, a one-way point-to-multipoint connection is established. That is, if there is a point-to-point connection setting request from an arbitrary mobile terminal in step 200 as shown in FIG. 2, is the connection requested in step 210 in the control network a wireless connection? Check it. In the case of the wireless connection setting request according to the test result, the process proceeds to step 230 and as shown in FIG. 4, the wireless connection setting process is performed as shown in FIG. 4, and in the case of the wired connection setting request, the general bidirectional PtP connection is set in step 220.

Hereinafter, a process of establishing a wireless connection will be described in detail with reference to FIGS. 4 and 6. First, in the embodiment of the present invention, a link from a mobile terminal to a network is defined as an uplink (A) and vice versa as a downlink (B), and there is a case where there is a connection PtP setting request from the mobile terminal. It is assumed that port 1 102 and port 4 108 are first connected as shown in FIG.

Referring to FIG. 4 under this assumption, the control network first registers a one-way point-to-multipoint connection (hereinafter referred to as PtM) at the calling port (ie, port 1) in step 310 (see FIG. 6). 1), and then registers the multicast information of the calling party (step 2 in FIG. 6). That is, multicast information about the uplink (A) connection is registered in the ATM switch 100 by performing step 320. The control network registers the unidirectional PtM connection (corresponding to ③ in FIG. 6) to the destination port (ie, port 4) in step 330, and proceeds to step 340 to register (④) the destination side multicast information.

Accordingly, according to the wireless connection setting request as described above, the unidirectional PtM connection is registered in the port 1 102 and the port 4 108, respectively, and the multicast information related to the connection is registered in the ATM switch 100.

Hereinafter, referring to FIGS. 5 and 6, a connection management method for preventing traffic disconnection during hand-over will be described. First, when the hand-over is started in step 400, the control network registers with the ATM switch 100 in step 410. The changed multicast information is changed (corresponding to ⑤ in FIG. 6) so that traffic can be transmitted to the port to be handed over (ie, port 3). That is, in step 410, the multicast information added with the port 3 106 is registered in the ATM switch 100.

Thereafter, the control network registers (6) the PtM connection to the port to be handed over (ie, port 3) in step 420, and maintains the registered connection in an inactive state. The reason for this is that blocking may occur by the active port 1 102 and the port 3 106. On the other hand, if the hand-over is completed in step 430, the control network proceeds to step 440 to activate the connection registered in the hand-overed port 3 (106), the downlink of the port 1 (102) used before the hand-over (B) Delete the connection (⑦). In step 450, the control network changes the multicast information so that traffic is not transmitted to port 1 (102) that was used before hand-over. That is, the multicast information registered in the ATM switch 100 in step 320 is deleted (⑧) in step 450.

Therefore, by the above-described procedures, the instantaneous disconnection of the traffic channel during hand-over can be prevented.

As described above, when the ATM switching system receives a connection setup request from a wireless terminal, the present invention has an effect of preventing a decrease in call quality due to a momentary disconnection of a traffic channel that may occur during hand-over. The advantage is that soft hand-over in the direction is possible.

Claims (2)

In the connection management method in the asynchronous transmission mode switching system, A first step of establishing a one-way point-to-multipoint connection at the source and destination ports and registering the multicast information according to a request for establishing a wireless connection; A second step of newly establishing a one-way point-to-multipoint connection to the port to be handed over and additionally registering multicast information; And a third process of deleting only the connection and the multicast information set before the hand-over when the hand-over is completed. The method of claim 1, wherein the connection set to the port to be handed over in the second process is activated when the hand-over is completed.