KR100249509B1 - Call recovering method - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a call recovery method in service in case of an internal fast switch failure.

2. The technical problem to be solved by the invention

The present invention is to provide a service call recovery method that can continue to provide services by reconnecting to another normal switch without terminating abnormally interrupted calls to one of the service in the redundant high-speed switch.

3. Summary of Solution to Invention

The present invention includes a first step of arbitrating a service by connecting to an information provider according to a connection request from a subscriber; Receiving a switch failure information during service connection arbitration; After recovering the failed channel by changing the active channel to standby during the service state of the channel connected to the failed switch, and changing the bus type to a normal switch, the service channel in the standby state is activated to continue mediating the service. Including the third step.

4. Important uses of the invention

The present invention is used in a communication processing system and the like.

Description

Call recovery method in service in case of internal high speed switch failure in mass communication processing system

The present invention relates to an in-service call recovery method that continues to provide services by reconnecting abnormally terminated calls to another switch that normally operates when a failure occurs in one of the redundant high-speed switches in a large-capacity communication processing system.

In general, the high-capacity communication processing system provides the service users of the telephone network and the Integrated Service Digital Network (ISDN) to provide information service of a plurality of additional communication providers on the packet network and the Internet, as well as to collect the billing services of these services. In order to provide a network matching device for interfacing each of these networks is provided with a high-speed switch inside.

These high-speed switches are connected between service consumers and information providers and are redundant, distributing the load on the overall system.

Conventionally, when data is transmitted and received through a designated path through a call setup step, and a service cannot be continuously provided due to a failure of one of the redundant switches, 50% of calls currently in service are abnormally terminated and abnormally serviced. There was a problem releasing the call.

In order to solve the problems as described above, the present invention can continue to provide services by reconnecting to another normal switch without terminating abnormally interrupted calls in the event of a failure of one of the services in the redundant high-speed switch The purpose is to provide a call recovery method in service.

1 is an exemplary view of a hardware system to which the present invention is applied.

2 is an exemplary view of the mass communication processing system of FIG.

3 is a structural diagram of a connection routing table used in the present invention.

4 is a structural diagram of a service call information management table used in the present invention.

5 is a flowchart illustrating a call recovery method in a subscriber matching system when a switch fails according to the present invention.

6 is a flowchart illustrating a call recovery method in an information provider matching system in case of switch failure according to the present invention;

* Explanation of symbols for the main parts of the drawings

10: large capacity communication processing system

20: Information provision system

In order to achieve the above object, the present invention provides a method for recovering a service interrupted call in the event of a failure of an abnormally serving switch in a large capacity communication processing system having a redundant switch, the method comprising: Connecting to mediate a service; Receiving a switch failure information during service connection arbitration; After recovering the failed channel by changing the active channel to standby during the service state of the channel connected to the failed switch, and changing the bus type to a normal switch, the service channel in the standby state is activated to continue mediating the service. A third step is included.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is an exemplary view of a hardware system to which the present invention is applied.

The mass communication processing system 10 interlocks network matching devices using an internal high speed switch. Here, the high speed switch distributes the load of service traffic, and two switches are configured in a redundant manner to stabilize the system.

Therefore, in order to reduce the load of the system block in which the traffic is concentrated in the large-capacity communication processing system 10 and to stabilize the entire system, the switch in which the traffic is concentrated is duplicated, so that such a switch occurs in the case of a failure in one switch during service. Any service call that is connected to the service may be abnormally terminated.

This phenomenon must be recovered in terms of quality of service because many subscribers, which occupy almost half of the total system capacity, are simultaneously abnormally terminated.

Therefore, in the event of a failure of one of the redundant switches, these abnormally terminated calls can be reconnected to the other redundant redundant switch without failing to reconnect service calls having the path of the failed switch to the normal switch.

The mass communication processing system 10 includes a plurality of information providing systems 20 connected to a packet network, the Internet, a frame relay network, an ATM network, etc. to subscribers connected to a telephone network, an integrated information communication network (ISDN), and a packet network. To provide services.

The mass communication processing system 10 includes a subscriber matching system 11 to 13, a high speed switching fabric (HSSF) 18, an information provider matching system 13 to 16, and an operation and management of such a system. And a Local Operation Subsystem (LOMS) 17.

Looking at the structure of the mass communication processing system 10 having a dual structure as described above in more detail as shown in FIG.

Subscriber matching system (11 to 13) is a telephone network matching subsystem (TNAS: Telephone Network Access Subsystem) (11) for service access of telephone network subscribers, ISDN network matching subsystem (INAS: ISDN Network Access) for service access of ISDN subscribers Subsystem (12) and a Packet Network Access Subsystem (PNAS) 13 for service access of subscribers connected to the packet network.

The High Speed Switching Fabric (HSSF) 18, which is an internal high speed switch of the mass communication processing system 10, is configured in a redundant manner to distribute the load burden (18-1, 18-2).

The information provider matching system 13 to 16 includes a packet network matching subsystem (PNAS) 13 for connecting the information providing system 20, a web network access subsystem (WNAS) 14, and a frame relay network. Frame Relay Network Access Subsystem (FNAS) 15, and ATM Network Access Subsystem (ANAS) 16.

The packet network matching subsystem 13 is configured to match the packet network users or the information providing system 20 according to the service program with the same system.

The packet network matching subsystem 13 is connected to a packet user to a service user connected to a public switched telephone network (PSTN), a packet switched data network (PSDN), and an integrated information communication network (ISDN). Provides an information service of the information providing system 20.

Looking at the HSSF communication primitives and network identifiers used by each network matching system 11 to 16 to interwork with each other through the high speed switch 14 are as follows.

HSSF communication primitives include message types (HSSF_USER_CONN_REQ, HSSF_USER_CONN_CNF) for request and confirmation for call connection, message types (HSSF_USER_CLR_REQ, HSSF_USER_CLR_CNF) for call release, message type (HSSF_USER_DATA) for sending and receiving data, and bus failures of switches. It consists of message types (HSSF_USER_RESUME, HSSF_USER_RESUME_ACK) for recovering a call in service.

Network Id is used to distinguish the access network and classifies X.25, PSTN, Frame Relay, ISDN, ATM, and Internet.

3 is a structural diagram of a connection routing table used in the present invention, and a routing information table on a high speed switch for connection between respective network matching systems via HSSF 18, which is a redundant high speed switch in the mass communication processing system 10. Indicates.

Referring to the table of FIG. 3, the first item represents HSNA_Id information which is a fast switch access node of each network matching device.

The routing table of such a fast switch has four states according to the switches for each of the 32 fast switch connection nodes (HSNA_Id) 31 and each matching device. This is a high speed switch matching identifier (HSNA_Id) 31, a bus type 32, a high speed switch matching status (HSNA Status) 33, and a connection matching system status (SPA Status) 34.

In the first item, when HSNA_Id 31 is 0, the fast switch matching state 33 is GOOD both of the A and B bus states 32 and the state 34 of the connection matching system is also GOOD. Thus, the switch can provide a service in which load balancing is separated for each access call.

In the second item, if HSNA_Id 31 is 1, the fast switch matching state 33 is GO A both of the A and B bus states 32, but the connection matching system state 34 is bad (BAD). Therefore, the switch is normal, but the connection system is down, so it cannot provide service.

In the third and fourth items, when the HSNA_Id 31 is 2 and 3, the fast switch matching state 33 is only GOOD in one of the A and B bus states 32. System state 34 is GOOD so that the switch can provide service over the GOOD state.

In the fifth item, if HSNA_Id 31 is 4, the fast switch matching state 33 is both A and B bus state 32 bad (BAD), so service is independent of the connection matching device state 34. Can not provide.

4 is a structural diagram of a service call information management table used in the present invention, which is a table for managing channel information provided by a service in each network matching system.

The information used for the subscriber matching system (11 to 13) is composed of a start channel identifier (Start_Ch_Id) 41, which is channel information, and a start fast switch matching identifier (Start_HSNA_Id) 42, which is switch access node information, and the information provider matching system. Information used for 13 to 16 is composed of end channel identifier (End_Ch_Id) 43, which is channel information, and end high speed switch matching identifier (End_HSNA_Id) 44, which is switch connection node information. In addition, a bus type (Bus_Type) 45, which is a switch identifier for distinguishing the switches to which these matching devices are connected, and a channel status (Ch_Status) 46 representing the channel status in each matching system 11 to 16. do.

Channel information (41, 43) is an identifier for the subscriber to distinguish the service channel in the matching system (11 to 16), HSNA_Id (42, 44) is information indicating the connection node of the switch has a value between 0 and 31 .

The bus type 45 is for identifying a redundant switch and is divided into two types, A_Bus and B_Bus.

The channel state 46 indicates the state of the channel and is initialized to null, welcome message transmission state Welcome, call connection state Calling, service state Service, and pause It is divided into Suspend state.

5 is a flowchart illustrating a call recovery method in a subscriber matching system in case of a switch failure according to the present invention, and a call recovery procedure in subscriber matching systems 11 to 13 for recovering a call in service when a switch failure occurs. Indicates.

First, the subscriber matching system 11 to 13 is in a service waiting state, and when a subscriber requests a connection by entering an access number (Key in) for service access (501), it receives it (502) and uses the service menu. It transmits to the terminal (503), and receives the user's selection information (504).

Thereafter, the received information is requested to the service provider matching system 13 to 16 through the switch using the communication primitive and data format on the switch (505), and the connection result is analyzed (506).

As a result of the analysis, if the service connection is successful, the relay function for providing the service of the information providing system 20 is continued to the subscriber (507), and if the service connection fails, the service access to the information provider matching system (13 to 16). The service notifies the failure and transmits the service menu to the subscriber station again (503).

During the mediation of the service between the subscriber and the information providing system 20, if a switch failure occurs and the switch failure information is received from the operation management device LOMS 17 (508), the service call information management table (see Fig. 4) In the service state of the channel connected to the failed switch, the active channel is changed to the standby state, and the bus type 45 is changed to the bus type of the normal switch Bus_Type (509). At this time, the service channel which is not in the active state performs service termination and initializes.

Next, in order to recover the channel via the failed switch, information of the channel to be restored is transmitted to the information provider matching systems 13 to 16 using the transmission message HSSF_USER_RESUME (510), and the information provider matching system ( 13 to 16) after receiving the response message (HSSF_USER_RESUME_ACK) (511), using the response message to recover the failed channel (512).

Finally, after changing the state of the service channel in the suspend state to the active state by using the received response message (513), the service is continuously mediated between the subscriber and the information providing system 20 ( 514).

6 is a flowchart illustrating a method for recovering a call in an information provider matching system in case of a switch failure according to the present invention, wherein the call in the information provider matching system 13 to 16 is used to recover a call in service when a switch fails. Indicates a recovery procedure.

First, the information provider matching system 13 to 16 is in a service waiting state and the service call with the information providing system 20 from the subscriber matching system 11 to 13 through the switch using communication primitives and data formats on the switch. If a connection is requested (601), the information provider matching system 13 to 16 requests a service connection using the protocol of the access network (602), and analyzes the connection result (603).

As a result of the analysis, if the service connection succeeds normally, the corresponding channel information is stored in the service call information management table (see FIG. 4) in an activated state (605), and the service of the information providing system 20 to the subscriber matching system 11 to 13 is performed. The relay function for providing a service is continued (606).

As a result of the analysis, if the service connection fails, the subscriber matching system 11 to 13 notifies the service connection failure and returns to the initial state.

During the mediation of the service between the subscriber and the information providing system 20, when a switch failure occurs and receives the switch failure information from the operation management device LOMS 17 (607), the service call information management table (see Fig. 4). In the service state of the channel connected to the failed switch, the active channel is changed to the standby state, and the bus type 45 is changed to the bus type Bus_Type of the normal switch (608). At this time, the service channel which is not in the active state performs service termination and initializes.

Then, in order to recover the channel via the failed switch, the information on the channel to be recovered is transmitted to the subscriber matching systems 11 to 13 using the transmission message HSSF_USER_RESUME (609), and the subscriber matching systems 11 to 13 are used. After receiving the response message (HSSF_USER_RESUME_ACK) from the (610), using the response message to recover the failed channel (611).

Finally, after changing the state of the service channel in the suspend state to the active state by using the received response message (612), the service is continuously mediated between the subscriber and the information providing system 20 ( 612).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

According to the present invention as described above, it is possible to continue to provide services by restoring an abnormally terminated call by reconnecting to another normal switch without terminating abnormally interrupted abnormal calls in the event of a failure of a redundant switch configured, It is possible to improve the service quality due to load balancing by dualizing the system where the traffic is concentrated inside, such as a large-capacity communication processing system, and recover the service without affecting the service call in case of system failure.

Claims (4)

Claims [1] A method for recovering a service interrupted call in case of a failure of an abnormally serving switch in a large capacity communication processing system having a redundant switch. A first step of arbitrating a service in connection with an information provider in accordance with a connection request from a subscriber; Receiving a switch failure information during service connection arbitration; After recovering the failed channel by changing the active channel to standby during the service state of the channel connected to the failed switch, and changing the bus type to a normal switch, the service channel in the standby state is activated to continue mediating the service. 3rd step Call recovery method in service in the event of an internal high speed switch failure comprising a. The method of claim 1, The first step is, Receiving a connection request service from a subscriber; A fifth step of receiving a user's selection information from the subscriber terminal after transmitting a service menu to the user terminal; A sixth step of requesting service connection to the information provider matching unit through the switch; A seventh step of analyzing a connection result with the information provider matching system; An eighth step of arbitrating a service from the information provider to the subscriber if the service connection is normally successful as a result of the analysis of the seventh step; And As a result of the analysis of the seventh step, when the service connection fails, the ninth step of notifying the information provider matching system of the service connection failure and transmitting the service menu to the subscriber terminal again Call recovery method in service in the event of an internal high speed switch failure comprising a. The method according to claim 1 or 2, The third step, A tenth step of changing an active channel from a service state of a channel connected to a failed switch in the service call information management table to a standby state, and changing the bus type to a normal bus type of the switch; An eleventh step of transmitting information of a channel to be restored to the information provider matching system in order to recover the channel via the failed switch; A twelfth step of receiving a response message from the information provider matching system and recovering a failed channel by using the response message; And A thirteenth step of changing the state of the service channel in the standby state to an active state by using the received response message, and then continuously mediating the service between the subscriber and the information providing system; Call recovery method in service in the event of an internal high speed switch failure comprising a. The method of claim 3, wherein The twelfth step, A step 14 of transmitting information of a channel to be recovered to the subscriber matching system using a transmission message (HSSF_USER_RESUME) in order to recover a channel via a failed switch; A fifteenth step of recovering a failed channel by analyzing a response message (HSSF_USER_RESUME_ACK) received from the subscriber matching system; Call recovery method in service in the event of an internal high speed switch failure comprising a.

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