KR100302868B1 - method for switch over communication path of V5.2 ISDN call - Google Patents

Abstract

The present invention transmits the information on the changed communication path to the ISDN call processor when the communication path is switched, so that the correct communication path is notified when the ISDN call processor requests the subscriber to send a message to the V5.2 protocol device controller. The present invention relates to a communication path switching method of a V5.2 ISDN call, which can be transmitted through an established communication path.

According to an aspect of the present invention, there is provided a communication path switching method of a V5.2 ISDN call, the method comprising: a change information notification step of informing a V5.2 protocol device control unit and an ISDN call processing unit of information on a communication path changed due to a V5.2 protocol switching; A communication path resetting process of resetting a communication path by using the information on the changed communication path; And a message transmission process for delivering a message using the reset communication path.

Description

Method for switch over communication path of V5.2 ISDN call}

The present invention relates to a communication path switching method of a V5.2 ISDN call. In particular, when a communication path of an ISDN call is switched at an exchange, a communication path switching of a V5.2 ISDN call can be performed without interrupting the ISDN call service. It is about a method.

ISDN service has recently emerged as a technology for user convenience, and is recently entering the commercialization stage by introducing the V5.2 protocol technology.

The V5.2 protocol is recommended by the International Telecommunication Union-Telecommunications standardization section (ITU-T) and the European Telecommunications Standardization Institute (ETSI), the telecommunications union standard. Network (hereinafter referred to as AN).

As shown in FIG. 1, when power is applied to a system, the V5.2 protocol device controller receives communication path information of a V5.2 interface from a V5.2 protocol stack, and stores it in a table that is managed by itself. On the basis of the communication path information provided from the V5.2 protocol stack, the subscriber requests to establish a communication path to be used for the V5.2 protocol and the ISDN signal (S10 to S14). Upon receiving the request for establishing the communication path, the subscriber end establishes a corresponding communication path in consultation with the AN to initialize the system.

As described above, when it is necessary to perform communication through the V5.2 interface after initializing the system, the ISDN call processing unit can communicate with any communication path of the V5.2 interface from the V5.2 protocol stack. It is provided with information on whether it is present and stored in the memory for future reference. The ISDN call is initiated based on the communication path information provided, and the ISDN message and setup signal are transmitted to the V5.2 protocol device controller. (S16 to S22). Here, the setup signal includes a user port attempting an ISDN call, a communication path (physical link, D channel) allocated from the V5.2 protocol stack, and a terminal endpoint identifier (TEI) information of an ISDN subscriber. .

The V5.2 protocol device controller, which has received the configuration signal from the ISDN call processor, stores the configuration signal transmitted for each user port therein and delivers the ISDN message to the subscriber based on the received configuration signal (S24 and S26).

As described above, the V5.2 protocol used between the AN to which the subscriber is actually connected during the ISDN call processing and the switching system allows the links between the two to be changed in communication path by failure or operator operation. When switching paths, switching is simultaneously performed not only for the communication path for the PSTN service but also for the communication path for the ISDN service.

As described above, when a switchover is made to the communication path, the V5.2 protocol stack provides information about the changed communication path due to the switching of the V5.2 protocol to the V5.2 protocol device controller, and the V5.2 protocol device controller Searches for the data stored in the user port, and updates the data with the changed communication path information, and transfers the communication path by using the information on the changed communication path (S28, S30). On the other hand, the ISDN call processing unit transmits the information on the communication path before the transfer to the ISDN call of the user connected when the message transmission command to the V5.2 protocol device control unit (S32).

Accordingly, the V5.2 protocol device control unit delivers the ISDN message based on the information received from the ISDN call processing unit. Since the information received from the ISDN call processing unit is information on the communication path before the transfer, the message is transferred to the wrong communication path. Delivered. That is, the V5.2 protocol device controller transmits the message to the previous communication path provided from the ISDN call processor in a state where the communication path is changed based on the information provided from the V5.2 protocol stack. .

As described above, in the conventional method of switching the communication path of the VDN ISDN call, the ISDN call processing unit does not know the changed information when the communication path is changed, so that the message is transferred to the communication path before the transfer and the ISDN call is connected. Abnormally released problem occurs.

The present invention has been made to solve the above-mentioned problem, and when the communication path is switched, the ISDN call processor transmits the information about the changed communication path to the ISDN call processor to transmit a message to the subscriber to the V5.2 protocol device controller. The purpose of the present invention is to provide a communication path switching method of a V5.2 ISDN call informing the correct communication path when required so that a message can be transmitted through the switched communication path.

1 is a flowchart illustrating a communication path switching method of a conventional V5.2 ISDN call.

2 is a view showing the configuration of a system to which the communication path switching method of the V5.2 protection protocol according to the present invention is applied.

3 is a flowchart for explaining a communication path switching method of a V5.2 ISDN call according to the present invention;

*** Explanation of symbols for the main parts of the drawing ***

10.V5.2 protocol stack, 20.V5.2 protocol device controller,

30. ISDN call processing section, 40. memory section,

50. subscribers, 60. AN

The present invention for achieving the above object, in the communication path switching method of the V5.2 ISDN call, the V5.2 protocol device control unit and ISDN call processing unit informs the information on the communication path changed due to the switching of the V5.2 protocol A change information notification process; A communication path resetting process of resetting a communication path by using the information on the changed communication path; And a message transmission process for delivering a message using the reset communication path.

In addition, the change information notification process includes the steps of: providing the V5.2 protocol device control unit with information on the communication path changed by the V5.2 protocol stack; Updating a table content with information on the changed communication path when a subscriber port having a communication path to be switched is found by searching the management table and the ISDN call management table managed by the V5.2 protocol device controller; ; Providing, by the V5.2 protocol device controller, information about a changed communication path to an ISDN call processor; And updating the information stored in the memory unit by the ISDN call processor with information on the changed communication path.

The information on the changed communication path includes information on the communication path used before the change and information on the communication path after the change, and the information on the communication path includes a physical link number and D channel information. .

In the communication path resetting process, the V5.2 protocol device controller requests the subscriber to reestablish the communication path based on the information on the changed communication path, and deletes the information on the previously used communication path. Requesting a request; And by the subscriber end resetting the communication path based on the information on the changed communication path according to the communication path resetting request.

The message transmission process may include providing, by the ISDN call processor, an ISDN message and a configuration signal to a V5.2 protocol device controller; And storing, by the V5.2 protocol device controller, the setup signal in the ISDN call management table, and forwarding the ISDN message to the subscriber end by using a communication path switched based on the setup signal.

The setup signal may include a user port attempting an ISDN call, information on a changed communication path provided by the V5.2 protocol device controller, and terminal endpoint identifier information of an ISDN subscriber.

Hereinafter, a communication path switching method of a V5.2 ISDN call according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram showing the configuration of a system to which the communication path switching method of the V5.2 protection protocol according to the present invention is applied. As shown in FIG. 2, the system to which the communication path switching method of the V5.2 protection protocol according to the present invention is applied includes a V5.2 protocol stack 10, a V5.2 protocol device controller 20, and an ISDN call. A processing unit 30, a memory unit 40, and a subscriber end 50 are provided.

In such a configuration, the V5.2 protocol stack 10 performs outgoing and outgoing call processing and interface and link and port state management of the subscriber, and works in conjunction with the ISDN call processing unit 30 to make and receive outgoing call processing and interface of the digital subscriber. Control call by performing link and port status management. When the call establishment request of the digital subscriber is transmitted to the ISDN call processing unit 30, it allocates a bearer channel required for the call.

The ISDN call processing unit 30 performs the incoming / outgoing call processing of the digital subscriber and the state management of the subscriber. The ISDN call processing unit 30 receives and processes the three-layer message of the ISDN subscriber from the V5.2 protocol device controller 20, and according to the call processing result. The V5.2 protocol device control unit 20 requests the subscriber to send a call control message to the subscriber, and controls the call flow until the call request of the subscriber, the reception of the called party, and the call with the called party are established.

The V5.2 protocol device controller 20 delivers messages received from the V5.2 protocol stack 10 and the ISDN call processor 30 to the subscriber end 50, and transmits messages transmitted from the subscriber side to the V5.2 protocol. It acts as a message interconversion interface delivered to the stack 10 and the ISDN call processor 30, respectively. Then, under the control of the V5.2 protocol stack 10, data link establishment and release of the V5.2 interface is performed.

The memory unit 40 controls various data management and call processing processes related to call control, and manages various devices (T-switch, signal device, tone, etc.) necessary for call processing and stores data about a call path. have.

The subscriber stage 50 functions to send and receive two-layer messages and V5.2 protocol messages of the ISDN to the subscriber connected to the AN 60 through the V5.2 interface.

3 is a flowchart illustrating a communication path switching method of a V5.2 ISDN call according to the present invention.

First, when power is supplied to the system, the V5.2 protocol stack 10 provides the communication path information of the V5.2 interface to the V5.2 protocol device controller 20, which is used for communication within the V5.2 interface. The physical link number, the ISDN signaling channel on the link, and communication path information for each protocol V5.2 are provided (S50).

The V5.2 protocol device controller 20 stores the communication path information of the V5.2 interface provided from the V5.2 protocol stack 10 in a table that manages itself (S52), and the V5.2 protocol stack 10 Based on the communication path information provided from the request to the subscriber terminal 50 to establish a communication path to be used for the V5.2 protocol and ISDN signals (S54). Accordingly, the subscriber terminal 50 having received the communication path setting request from the V5.2 protocol device controller 20 establishes a corresponding communication path in consultation with the AN 60 to initialize the system.

As described above, when it is necessary to perform communication through the V5.2 interface after initializing the system, the ISDN call processing unit 30 is the V5.2 protocol stack 10, and the ISDN call is any communication path of the V5.2 interface. Request information about whether the communication can be used, and V5.2 protocol stack 10 provides information on the ISDN communication path in accordance with the request of the ISDN call processing unit 30 (S56, S58). The ISDN call processing unit 30 provides information on the ISDN communication path received from the V5.2 protocol stack 10 so that an ISDN call can be established through the V5, 2 interface, that is, the subscriber's call is a path on the V5.2 interface. It is stored in the memory unit 40 for future reference through the V5.2 protocol device controller 20 by starting an ISDN call based on the communication path information provided from the V5.2 protocol stack 10. ) Sends an ISDN message and a setup signal (S60, S62). Here, the configuration signal includes a user port attempting an ISDN call, a communication path (physical link number, D channel) allocated from the V5.2 protocol stack, and TEI information of the ISDN subscriber.

As described above, the V5.2 protocol device controller 20 receiving the configuration signal from the ISDN call processing unit 30 stores the configuration signal transmitted for each user port in an ISDN call management table that manages itself, and the ISDN call processing unit. The ISDN message is transmitted to the subscriber terminal 50 based on the setup signal received from the terminal 30 (S64, S66).

As described above, V5 when the communication path switching by the protocol occurs in order to maintain the ISDN call service in progress when a switch operator request or a physical link failure of the V5.2 interface occurs during ISDN call processing. .2 The protocol stack 10 provides the V5.2 protocol device control unit 20 with information about the communication path changed due to the switching of the V5.2 protocol (S68). Here, the information on the changed communication path provided from the V5.2 protocol stack 10 to the V5.2 protocol device controller 20 includes information on the communication path used before the transfer and information on the communication path after the transfer. have.

The V5.2 protocol device controller 20, which has received information on the changed communication path from the V5.2 protocol stack 10, searches for its own management table and ISDN call management table, and has subscribers with communication paths to be switched. If the port is found, the information before the transfer is cleared and the table contents are updated with information on the communication path to be written after the transfer (S70).

If there is an update in the ISDN call management table in step S described above, it means that there was an ISDN call in progress at the time of transfer. In this case, the V5.2 protocol device controller 20 changes the communication path to the ISDN call processor 30. The transfer data of the port is provided (S72). Here, the transfer data is provided with information on the communication path before the transfer that the ISDN call user port had and information on the communication path after the transfer.

As described above, the ISDN call processing unit 30 that has received the transfer data of the user port whose communication path has been changed from the V5.2 protocol device control unit 20 performs the memory unit 40 to normally perform subsequent processing of the ISDN call in progress. ) Is updated to the communication path on the changed V5.2 interface (S74).

On the other hand, the V5.2 protocol device control unit 20 performs a communication path resetting procedure to perform communication in the changed communication path, the V5.2 protocol device control unit 20 is a V5.2 protocol in the above process S Based on the information on the changed communication path provided from the stack 10, the subscriber terminal 50 requests the communication path to be reset, and the previously used communication path is not used so that the communication path before the transfer is not maintained. Request deletion of information on the communication path (S76, S78). When the V5.2 protocol device control unit 20 requests the communication path to be reset to the changed communication path to the subscriber end 50 in step S76, the subscriber end 50 negotiates with the AN 60 to establish a communication path. Reset.

As described above, when the communication path switching is completed, the ISDN call processing part that is in progress in the switched communication path is performed, and the ISDN call processing part 30 is provided from the V5.2 protocol device control part 20 in the above-described process S72. The ISDN call is carried out based on the received information on the changed communication path, and the ISDN message and the setting signal are transmitted to the V5.2 protocol device controller 20 (S80). Here, the setup signal includes a user port attempting an ISDN call, a communication path (physical link number, D channel) assigned by the V5.2 protocol device controller 20, and TEI information of the ISDN subscriber.

The V5.2 protocol device controller 20 that receives the setup signal from the ISDN call processor 30 stores the setup signal transmitted for each user port in the ISDN call management table, and sends the setup signal to the setup signal received from the ISDN call processor 30. In accordance with the transfer of the ISDN message to the subscriber terminal 50 (S82 and S84). Since the setting signal transmitted from the ISDN call processing unit 30 to the V5.2 protocol device control unit 20 in step S includes information about the changed communication path, the V5.2 protocol device control unit 20 changes to the changed communication path. ISDN message can be delivered.

The communication path switching method of the V5.2 ISDN call of the present invention is not limited to the above-described embodiments, and may be modified in various ways within the scope of the technical idea of the present invention.

According to the communication path switching method of the V5.2 ISDN call of the present invention as described above, when the communication path is switched, the ISDN call processor transmits information on the changed communication path to the ISDN call processor to the V5.2 protocol device controller. When the subscriber is requested to transmit a message, the correct communication path is informed so that the message can be transmitted through the switched communication path. Thus, the communication path can be switched without disrupting the ISDN call service.

Claims (7)

In the method of switching the communication path of a V5.2 ISDN call, A change information notification process of notifying the V5.2 protocol device control unit and the ISDN call processing unit of information on the changed communication path due to the switching of the V5.2 protocol; A communication path resetting process of resetting a communication path by using the information on the changed communication path; And a message transmission process of delivering a message using the reset communication path. The method of claim 1, wherein the change information notification process is Providing, by the V5.2 protocol stack, information about the changed communication path to the V5.2 protocol device controller; Updating a table content with information on the changed communication path when a subscriber port having a communication path to be switched is found by searching the management table and the ISDN call management table managed by the V5.2 protocol device controller; ; Providing, by the V5.2 protocol device controller, information about a changed communication path to an ISDN call processor; And updating the information stored in the memory by the ISDN call processor with information on the changed communication path. The method of claim 2, wherein the information on the changed communication path includes: A communication path switching method of a V5.2 ISDN call, comprising information on a communication path used before a transfer and information on a communication path after a transfer. The method of claim 3, wherein the information on the communication path includes: A communication path switching method of a V5.2 ISDN call, characterized by comprising a physical link number and D channel information. The method of claim 1, wherein the rerouting process Requesting, by the V5.2 protocol device controller, to reset the communication path to the subscriber end based on the information on the changed communication path, and requesting to delete the information on the previously used communication path; And the subscriber end resetting the communication path based on the information on the changed communication path according to the communication path resetting request. The method of claim 1, wherein the message transmission process is Providing, by the ISDN call processor, an ISDN message and a configuration signal to a V5.2 protocol device controller; And storing, by the V5.2 protocol device controller, the setup signal in the ISDN call management table, and forwarding the ISDN message to the subscriber end using a communication path switched based on the setup signal. A method for switching communication paths of a V5.2 ISDN call. The method of claim 6, wherein the set signal The user port attempting the ISDN call, Information on the changed communication path provided by the V5.2 protocol device controller; Method for switching the communication path of the V5.2 ISDN call characterized in that the terminal endpoint identifier information of the ISDN subscriber is provided.