KR20010039059A - Method for managing resource release using FR and PRI call process ID - Google Patents

Abstract

An object of the present invention is to provide a resource release management method using a FR / PRI (Frame Relay / Primary Rate Interface) call process identifier for a wireless data call or fax call service in a CDMA mobile communication system. When the call is set up, after the mobile path and the PSTN path are established, the PRC (PRI call processor) transmits its ID to the FRC (FR call processor), and the FRC sends its ID to the PRC in response. For example, the FR call processing process ID and the PRI call processing process ID may be known for the same radio data call. Therefore, when releasing radio data call resources, the frame relay (FR) / first group interface (PRI) resources are released from the CDMA MSC to the Inter Working Function (IWF) and the IWF to the MSC. By doing so, it is possible to prevent a message from being lost within the MSC or to release resources due to an IWF failure, thereby improving reliability of resource management of the MSC.

Description

Method for managing resource release using FR and PRI call process ID}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code division multiple access (CDMA) wireless communication system, and more particularly, when a wireless data call resource is released from a mobile station (MS) or a public switched telephone network (PSTN). FR / interworking function (IWF) to the frame relay (FR) / primary group interface (PRI) resource release from the IWF to the MSC, to increase the reliability of the MSC resource management FR / The present invention relates to a resource release management method using a PRI call process identifier.

1 shows a general CDMA switch and data communication matching device block configuration for a wireless data call service.

As shown, a mobile station (MS) 10 is a terminal used by a mobile subscriber to receive voice services and wireless data services, and a CDMA Mobile Switching Center (MSC) 20 is the MS. It performs a function of exchanging a signal transmitted from (10).

The MSC 20 may include a Mobile Call Control (MCC) 21, an Access Switching Subsystem (ASS-IWF) 22, and a Relay Call Processor (TCR / TC7) 25. It is provided. The MCC 21 determines whether the signal received from the MS 10 is a voice call or a data call, and performs voice call processing. The ASS-IWF 22 performs a function of causing the MSC 20 to match with a data communication matching device (IWF) 30. The relay call processor 25 performs a relay call processing function with another network.

The ASS-IWF 22 includes a frame relay call control (FRC) 23 that performs frame relay call processing, and an integrated services digital network (ISDN) primary group interface (PRI). PRC (Primary Relay call Control) PRI to perform a call processing function (24).

In addition, the IWF (Interworking Function) 30 performs a matching function between the two protocols of FR and PRI, interworking with the terminal equipment (modem, fax) of the PSTN 40, and packet network Function to connect with.

The data path between the MS 10 and the IWF 30 is called a mobile path, and the data path between the PSTN 40 and the IWF 30 is called a PSTN path.

2 is a flowchart illustrating a conventional method for establishing a wireless data call connection.

Setting up a mobile path from the MSC 20 to the IWF 30 when the setup signal is transmitted from the MS 10 (ST1-ST7); If the mobile path is set, a process of setting a PSTN path from the IWF 30 to the MSC 30 is performed (ST8-ST19).

3 is a flowchart illustrating a method of releasing a FR / PRI resource for releasing a conventional wireless data call.

When the call release signal is transmitted from the MS 10, a process of releasing the mobile path from the FRC 23 to the IWF 30 (ST20-ST23); When the mobile path is released, a process of releasing the PSTN path from the IWF 30 to the PRC 30 (ST24-ST27) is performed.

The FR and PRI resource allocation and resource release methods for the conventional data call service are as follows.

Since the IWF 30 and the MSC 20 process call processing for the mobile path and call processing for the PSTN path separately, the mobile path and the PSTN path are independent of each other and are connected to different E1 links.

When an asynchronous data call or a fax call for a wireless data service is attempted from the MS 10, the MSC 20 first attempts to establish a mobile path through the MCC 21 and the FRC 23. If this setting is successful, the PSTN path is attempted through the TCR / TC7 25 and the PRC 24. The sequence of attempting to set this path is the same for both originating and incoming calls of mobile subscribers.

All.

In more detail, upon receiving the setup signal from the MS 10, the MCC 21 of the MSC 20 transmits an FRI setup request signal to the FRC 23 (ST1, ST2), and the FRC 23 again. The setup request signal is transmitted to the IWF 30 (ST3). The IWF 30 then allocates the FR resource (ST4), whereby the FRC 23 transmits the FRI setup response signal to the MCC 21 (ST5). In this way, the mobile path is set (ST6).

Subsequently, in order to set the PSTN path, the IWF 30 transmits a setup signal to the PRC 24 (ST8), and the PRC 24 transmits another network call setup attempt signal to the TCR / TC7 25 (ST9). In step 1010, a call proceed signal is transmitted to the IWF 30. Thus, the TCR / TC7 25 transmits a setup signal to the other network PSTN 40 (ST11). Accordingly, when a response signal is transmitted from the PSTN 40, the TCR / TC7 25 transmits a setup response signal to the PRC 24 (ST12-ST15). Therefore, when the PRC 24 transmits a connection signal (connect) to the IWF 30 and the connection response signal is transmitted from the IWF 30 to the PRC 24, the PSTN path is set (ST16 and ST17).

However, in the conventional FR and PRI resource allocation, processors are independently operated between the FRC 23 performing FR call processing and the PRC 24 performing PRI call processing. Therefore, in the FRC 23, there is no way for the processor performing the FR call processing to know the PRI call processing processor of the PRC 24 having passed through the IWF 30. Of course, in the opposite case, there is no way to know each other's call processing processors.

Next, a radio data call or a fax call release will be described. First, when releasing resources for an FR call in the FRC 23, if a call release signal is transmitted from the MS 10, the IWF 30 in the FRC 23 is transmitted. The mobile path must be released (ST20-ST23).

That is, when the FRC 23 transmits the radio data service call release signal CgRelRP from the MCC 21, the FRC 23 transmits a connection release request signal to the IWF 30, and the IWF 30 transmits the FRC ( 23) to send a disconnect signal. Accordingly, the FRC 23 transmits a connection release response signal to the IWF 30.

Thus, after releasing the FR resource, the IWF 30 transmits a disconnection request to the PRC 24 so that the PRI resource is released (ST24). The PRC 24 transmits a PSTN network release request signal to the TCR / TC7 25 (ST25), and sends a disconnection signal to the IWF 30 (ST26), whereby the IWF 30 transmits the PRC 24 to the PRC 24. The connection response signal is transmitted (ST27). So the PRI resource is released.

However, since the IWF 30 does not know the call processing processor of the FRC 23 and the call processing processor of the PRC 24 in the same data call, when the resource release for the FR call is performed in the FRC 23, if the IWF 30 is released. An abnormal cause of an alarm (i.e. an IWF alarm, a link alarm between the IWF and FR / PRI, a down IWF, etc.) may cause the resource to be released from the PRI call. In this case, the PRC 24 continues to use the PRI resource or performs resource release after a certain time.

In the opposite case, i.e., when the resource for the PRI call is released from the PRC 24, an abnormal cause of the IWF 30 (an alarm occurs in the IWF, a link alarm occurs between the IWF and the FR / PRI, and the IWF is down) Is generated and the resource cannot be released for the PRI call, the FRC 23 must either continue using the FR resource or release the resource after a certain time. As described above, the FR / PRI resource is not released or the resource release is delayed due to the failure of the IWF, resulting in a problem that resource utilization efficiency is lowered. In addition, there is a problem that the attempt rate of the wireless data call is lowered due to the resource that is not released.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is

When a radio data call resource is released from a mobile station (MS) or a public switched telephone network (PSTN), a frame relay (FR) from a CDMA MSC to an Inter Working Function (IWF) and an IWF to an MSC. FR / PRI call process to increase the reliability of MSC resource management by preventing the release of resources due to IWF failure or message loss inside the MSC by enabling the release of / primary group interface (PRI) resources It is to provide a resource release management method using an identifier.

In order to achieve the above object, the resource release management method using the FR / PRI call process identifier according to the present invention,

How to set up FR / PRI call connection for wireless data call service,

When the setup signal is received at the MSC, the mobile path is set from the FRC (FR call processor) to the IWF, and the FRC process ID (identifier) is mapped to the corresponding calling number and stored in a mapping table. A first process;

A second process of setting a PSTN path from the IWF to a PRI call processor (PRC) after performing the first process;

After performing the second process, the PRC transmits its own ID and calling number from the PRC to the FRC, and the FRC receiving the PRC process ID sends the FRC process ID mapped to the received calling number to the PRC. Perform a third process of transmitting to,

Resource release management method using FR / PRI call process identifier,

A fourth step of transmitting a PRI call release signal from the FRC to the PRC when a call release signal is transmitted from a mobile station (MS);

The FRC performs a fifth process of performing resource release on the FR call from the FRC to the IWF and performing resource release on the PRI call from the PRC to the IWF.

The fifth process may include performing resource release on a PRI call from the IWF to the PRC after performing resource release on the FR call.

1 is a block diagram of a general CDMA switch and data communication matching device for a wireless data call service;

2 is a flowchart illustrating a conventional method of establishing a wireless data call connection;

3 is a flowchart illustrating a method of releasing a FR / PRI resource for a conventional radio data call release;

4 is a flow chart showing a method of establishing a FR / PRI call connection for a wireless data call service according to the present invention;

5 is a flowchart illustrating a resource release management method using an FR / PRI call process identifier according to the present invention;

<Description of the code | symbol about the principal part of drawing>

10: MS 20: MSC

21: MCC 22: ASS-IWF

23: FRC 24: PRC

25: TCR / TC7 40: PSTN

Hereinafter, a resource release management method using the present invention FR / PRI call process identifier as described above will be described in detail with reference to the accompanying drawings.

4 is a flowchart illustrating a method for establishing a FR / PRI call connection for a wireless data call service according to the present invention.

As shown, when the setup signal is received at the MSC 20, the mobile path is set from the FRC 23 to the IWF 30, and the FRC process ID (identifier) is mapped with the corresponding calling number. A first process (ST31-ST36) for storing in a mapping table; A second step (ST37-ST39) of setting a PSTN path from the IWF (30) to the PRC (24) after performing the first step (ST31-ST36); After performing the second process (ST37-ST39), the PRC (24) transmits the PRC process ID and originating number to the FRC (23), the FRC (23) receiving the PRC process ID is received A third process (ST40-ST44) of transmitting the FRC process ID mapped to the called origin to the PRC 24 is performed.

5 is a flowchart illustrating a resource release management method using an FR / PRI call process identifier according to the present invention.

As shown, when a call release signal is transmitted from the MS 10, a first process ST45 of transmitting a PRI call release signal from the FRC 23 to the PRC 24; A second process (ST46-ST53) is performed to release resources for the FR call from the FRC 23 to the IWF 30 and to release resources for the PRI call from the PRC 24 to the IWF 30. Perform.

The second process (ST46-ST53), after the resource release for the FR call, the resource release for the PRI call from the IWF (30) to the PRC (24).

The resource release management method using the FR / PRI call process identifier according to the present invention as described above is as follows.

First, the process of establishing the FR call and the PRI call will be described.

When the setup signal is transmitted from the MS 10, the MCC 21 transmits an FRI setup request signal to the FRC 23, and the FRC 23 transmits a setup signal to the IWF 30 (ST31-ST33). The IWF 30 allocates resources for the FR call (ST34). Then, the FRC 23 maps the ID of the child process FRC _C with the calling party number and stores it in the mapping table (ST35). Thereafter, the FRC 23 transmits an FRI setup response signal to the MCC 21 (ST36).

When the FRI call is established, the IWF 30 transmits a setup signal to the PRC 24 and the PRC 24 transmits a call setup attempt signal to the PSTN 40 to the TCR / TC7 25 (ST37). Thereafter, a connection signal is transmitted from the PRC 24 to the IWF 30, and a connection response signal is transmitted from the IWF 30, thereby connecting the PSTN paths (ST38 and ST39).

When the PSTN path is connected in this way, the PRC 24 transmits a signal (PRI_connect) indicating that the PSTN path is connected to the FRC 23 so that the FRC 23 knows the call processing process ID of the PRC 24. . Then, the FRC 23 finds the FRC call processing process ID mapped to the calling number included in the PRI_connect signal by referring to the mapping table and transmits the FRC process ID to the PRC 24 by including the FRC process ID in the PSTN connection signal ( ST40-ST44). Thus, the FRC 23 and the PRC 24 can know the process ID for the same radio data call.

The path setting procedure is performed in the same order in case of origination and inbound of the mobile subscriber.

Next, a process of releasing a scary data call will be described.

When the resource release signal is transmitted from the MS 10, since the FRC 23 knows the PRC process ID for the same call, the resource release message IWF_release is transmitted to the PRC 24, and the PRC 24 transmits the resource release signal. Attempt to release the PRI resource (ST45).

The FRC 23 attempts to release the resource for the FR call by transmitting a disconnect request signal to the IWF 30, and the PRC 24 receiving the PRI resource release signal from the FRC 23 performs the release of the PRI resource. Try (ST46-53). After the resource for the FR call is released, the IWF 30 attempts to release the PRI resource to the PRC 24 (not shown in FIG. 5). Thus, the release of the PRI resource is made bidirectionally between the IWF 30 and the PRC 24, so that the release of the PRI resource is normally performed even when an abnormality occurs in the IWF 30.

When the resource release is requested from the PSTN 40, the PRC 24 knows the process ID of the FRC. Therefore, the PRC 24 sends an IWF_release message to the FRC 23 to release the FR resource from the FRC 23 to the IWF 30. Try. On the other hand, after the release of the PRI call from the PRC 24 to the IWF 30, the call release of the FR is also attempted from the IWF 30 to the FRC 23. Therefore, the resource release is performed in both directions (FRW IWF, FRW IRC). If call duplication occurs in MSC 20, it attempts to release resources from each other according to ISDN Q.931.

In this way, when the resource is released from the MS or PSTN, the resource cannot be released due to the loss of MSC internal messages (between FRC and PRC), or the resource cannot be released due to IWF failure. As a way of inducing release, attempts to release resources improve the reliability of resource management.

As described above, in the resource release management method using the FR / PRI call process identifier according to the present invention, when a radio data call or a fax call is set up in a CDMA mobile communication system, after the mobile path and the PSTN path are configured, The ID is transmitted to the FRC, and the FRC transmits its ID to the PRC as a response so that the FR call processing ID and the PRI call processing ID can be known to each other for the same radio data call. Therefore, when releasing radio data call resources, the frame relay (FR) / first group interface (PRI) resources are released from the CDMA MSC to the Inter Working Function (IWF) and the IWF to the MSC. By doing so, there is an effect of preventing a resource from being released due to a message loss or an IWF failure inside the MSC. It also improves the reliability of the MSC's resource management.

Claims (3)

FR (Frame Relay) resources and PRI (Primary Rate Interface) for wireless data call service in mobile communication switching center (MSC) and data communication matching device (IWF) equipped with FR call processing unit (FRC) and PRI call processing unit (PRC) In the resource release management method, FR / PRI call connection setup method for the wireless data call service, When a setup signal is received at the MSC, a first path for setting a mobile path from the FRC to the IWF, mapping an FRC process identifier (ID) and a corresponding calling number, and storing the mapping path in a mapping table Process; A second step of setting a PSTN path from the IWF to the PRC after performing the first step; After performing the second process, the PRC transmits its own ID and calling number from the PRC to the FRC, and the FRC receiving the PRC process ID sends the FRC process ID mapped to the received calling number to the PRC. Perform a third process of transmitting to, Resource release management method using the FR / PRI call identifier, A fourth step of transmitting a PRI call release signal from the FRC to the PRC when a call release signal is transmitted from a mobile station (MS); Resource release management using a FR / PRI call process identifier, characterized in that the FRC performs resource release for the FR call from the IWF to resource release for the PRI call from the PRC to the IWF. Way. The method of claim 1, wherein the fifth process comprises: And performing resource release on the PRI call from the IWF to the PRC after performing the resource release on the FR call. The method of claim 1, wherein the resource release management method using the FR / PRI call process identifier, When a call release signal is transmitted from a public switched telephone network (PSTN), transmitting a FR call release signal from the PRC to the FRC; Performing resource release on the PRI call from the PRC to the IWF and performing resource release on the FR call from the FRC to the IWF.