KR100540836B1 - System And Method For Processing Call Event And Call Control In Access Gateway - Google Patents

Abstract

The present invention relates to a system and method for call event and call control processing in an access gateway configured to generate and process call events and call control messages in the MEGACO (MEGA GAteway Control) protocol processing of an access gateway implemented in a next generation network. It is about.

The present invention generates a child process for each call event and a call control message by a soft switch at the subscriber and device side in the access gateway to perform a corresponding work process, and then terminates by itself. This enables processing and at the same time reduces excessive process run time, thereby improving system resource availability and performance.

In addition, the present invention can prevent the mutual interference due to the simultaneous execution of call events and call control by performing the corresponding function processing while transitioning to the standby-drive-end state with reference to the call progress step table in each child process. Therefore, it is possible to secure the stability of the system operation, such as preventing abnormal call processing due to the collision of call events and call control function processing.

Description

System and Method For Processing Call Event And Call Control In Access Gateway

1 is a diagram schematically illustrating a next generation network having a structure in which a plurality of heterogeneous networks interwork with each other.

2A and 2B illustrate a call setup procedure through interworking between a conventional soft switch and an access gateway.

3 is a diagram illustrating a call release procedure through interworking between a conventional soft switch and an access gateway.

4 is a diagram illustrating a subscriber-specific process generation processing structure in a conventional access gateway.

5 illustrates a call event and call control processing system at an access gateway in accordance with the present invention.

FIG. 6 is a diagram illustrating call progress steps of a calling party and a called party in relation to a call progress step table in FIG. 5; FIG.

7 is a flowchart illustrating call event and call control processing operations in an access gateway in accordance with the present invention.

8 illustrates a state mismatch structure in a typical access gateway.

Explanation of symbols on the main parts of the drawings

51: event buffer process 52: message buffer process

53: main process 54: task performing process

55: call progress step table

The present invention relates to an access gateway implemented in a next generation network, and more particularly, to a call event and call control processing system and method in an access gateway configured to generate and process a call event and a call control message in a MEGACO protocol processing. will be.

Recently, as the communication service is advanced, a next generation network having a structure in which a plurality of heterogeneous networks interoperate with each other is implemented as shown in FIG. 1, and a soft switch in the structure of the next generation network. (Switch, SoftSwitch) and each access gateway (SG, RG, TAM, CAM, etc.) are interworking using MGCP (Media Gateway Control Protocol) / MEGACO (MEGAGAteway Control) protocol, and the connection network is UDP / IP ( User Datagram Protocol / Internet Protocol) protocol is used.

In FIG. 1, the access gateway operates by device events occurring at the subscriber side and call control by a soft switch.

In addition, the aforementioned call setup flow and call release flow through interworking between the soft switch and the access gateway are as shown in FIGS. 2A, 2B, and 3 of the accompanying drawings. And FIG. 2B illustrates a procedure in which a normal call is set up based on the calling party, and FIG. 3 illustrates a procedure in which the call is released upon request of the calling party.

At this time, the call control of the access gateway performs call control by interworking with a soft switch through an IP network as shown in FIG. 1, and the aforementioned MEGACO protocol (RFC 3015) defines such a series of call processing procedures. Each network device performs call processing as shown in FIGS. 2A, 2B, and 3 based on the MEGACO protocol.

On the other hand, the hook on and hook off events of subscribers occur irregularly due to the characteristics of most communication services currently provided, and call control of soft switches is performed by the MEGACO protocol. The access gateway has the characteristic to be accepted unconditionally.

Therefore, in most conventional small-capacity access gateways, in order to prevent collisions between irregular hook on / off events by subscribers and call control events by soft switches, as shown in FIG. You are creating a separate process, which processes each event sequentially in the order in which they occurred.

That is, as shown in FIG. 4, when the hook-off information generated by the subscriber side is transferred to the main process, and a message for generating the called party subscriber under the control of the soft switch is transmitted to the main process, The main process being created will create a unique process for each case.

At this time, the originating subscriber process generated by the main process operates by receiving events such as digit input or hook-on of the calling party and call control of the soft switch. The call control of the soft switch is received and operated.

The main process then kills the process that was created when the originating hook-on event or the soft switch was subtracted.

In addition, in the case of the conventional large-capacity access gateway, there is a problem to be considered in a part not defined in the MEGACO protocol, and when switching to multiprocessor for performance, a problem to be considered in the small sequential processing is required. have.

In other words, the process is operated from the beginning to the end of the call as the process is created for each call in the small-capacity access gateway, and thus, excessive capacity is generated when accommodating a large number of subscribers, which causes a decrease in the performance of the system. Inaccurate processing causes a ghost process.

In addition, in the conventional access gateway, when providing a tone to the subscriber side, the main process waits for a response after making a service request to the tone providing device, and when the response does not come due to a device error, the corresponding call process is performed for a predetermined time. Is in the holding state, and there is a problem that the subscriber-side event and the soft switch control message occurring in the process holding state are lost, which may cause a bug in the signaling device and resource management in the access gateway. There was a problem that caused the error.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to generate a child process for each call control message by a soft switch and a call event on the subscriber and device side of the access gateway, thereby performing a corresponding operation in each child process, In order to handle call events and call control messages.

Another object of the present invention is to allow the sequential processing of call events and call control by allowing each child process generated for call event and call control message processing to terminate itself after performing the corresponding work. It is to improve the availability and performance of system resources by reducing excessive process operating time.

It is still another object of the present invention to perform mutual function due to simultaneous execution of call events and call control by performing corresponding function processing while transitioning to the standby-drive-end state with reference to the call progress step table in each child process. It is possible to secure the stability of system operation by preventing abnormal call processing caused by collision between call event and call control function processing.

A feature of the present invention for achieving the above object is an event buffer process for collecting various call event information generated by the irregular operation on the subscriber and device side in the order of occurrence; A message buffer process for collecting MEGACO messages for call control of the soft switch in the order of their occurrence; A child process created mutually exclusively for call event or call control message processing, comprising: a task performing process that terminates itself after performing a given call event or call control message processing function respectively; And a main process that buffers the call event or call control message collected by the event buffer process and the message buffer process in a local memory, and sequentially reads and generates a work performing process for processing a corresponding call event or call control message. The present invention provides a call event and call control processing system in an access gateway.

In addition, the above-described call event and call control processing system in the access gateway sets a state flag for each step for each subscriber's call progress step such as the call event and call control message processing to terminate the step in the current driving state. It further comprises a call progress step table for managing not to transition to the next step until.

In this case, the work execution process is characterized by performing the corresponding work while transitioning to the standby-driven-end state so that there is no interference by different process tasks with reference to the call progress step table.

Another aspect of the present invention includes the steps of: collecting and buffering call events and call control messages generated during call progress in a local memory; Sequentially accessing the local memory to create separate work execution processes mutually exclusive for processing a call event or call control message; The individual task execution process is to provide a call event and call control processing method in the access gateway comprising the step of terminating after performing a call event or call control message processing task.

The buffering of the call event and call control message may include collecting call event information generated by a subscriber or a device in an event buffer process; Collecting a call control message generated by the soft switch in the message buffer process; Buffering the collected call event information or call control message information in a local memory in a main process.

The task execution and termination of each task execution process may include: performing a call event or call control message processing task while transitioning to a standby-drive-end state with reference to a call progress step table in each task execution process; And terminating the process itself after performing a call event or call control message processing task given to the respective task execution process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the access gateway according to the present invention, by creating a separate process for the subscriber-side event and call control of the soft switch to perform the corresponding event or control processing, the access gateway terminates itself regardless of the overall call progress. The call control of the switch is to be sequentially processed without mutual interference, and the call event and call control processing system in the access gateway for this purpose is shown in FIG. 5, an event buffer process 51 and a message buffer process ( 52 and a main process 53, a job execution process 54, and a call flow step table 55.

The event buffer process 51 generates information on various call events (eg, hook on / off, hook flash, digit, etc.) generated by irregular operation on the subscriber and device (e.g., tone transmitting device, etc.). Message buffer process 52 collects MEGACO messages (e.g., tone transmission control messages, etc.) for call control of the soft switch in the order of their occurrence.

The main process 53 buffers the call event or call control message collected by the event buffer process 51 and the message buffer process 52 in the local memory, and sequentially reads the call event or call control message according to its storage order. Create a work execution process 54 for call control message processing.

The task performing process 54 is a child process that is mutually exclusively independently generated by the main process 53 for processing a call event or call control message, and terminates itself after performing a given call event or call control message processing function, respectively. In addition, referring to the call progress step table 55, the corresponding operation is performed while the system transitions to the standby-driven-end state so that there is no interference by different process tasks.

The call progress step table 55 sets a waiting state, a running state, and a finishing state flag for each step for the call progress step for each subscriber, so that any call progress step is in the driving state. Even if a processing operation for the next step is required, the control does not transition to the next step until the step which is currently driven is completed.

For example, when a call progress step of the calling party (dotted line) and the called party (solid line) is expected as shown in FIG. 6 attached to the call progress step table 55, three states, i. In this case, the step is driven and terminated. When one step is driven as a standby-driven-end state, it does not transition to the next step until the processing operation for the next step ends. Therefore, when one task execution process 54 occupies an arbitrary state transition operation, another task execution process 54 performs an operation in a corresponding state after a predetermined time, and thus different process tasks It is possible to prevent the interference phenomenon caused by.

Call event and call control processing operations in the access gateway according to the present invention having the above-described configuration will be described with reference to FIG. 7 as follows.

First, in the present invention, the access gateway generates a work performing process 54 that is a child process for each call event or call control message in order to minimize an active time of the process in processing call events and call control messages. For this purpose, the main process 53 sequentially accesses the local memory where the call event or call control message collected by the event buffer process 51 and the message buffer process 52 is buffered to generate a call event by the subscriber or the device. It is checked whether or not the call control message is generated by the soft switch, and generates a corresponding work execution process 54 according to the result.

That is, the main process 53 buffers the call event information collected by the event buffer process 51 in the local memory, and also buffers the call control message information collected by the message buffer process 52 in the local memory. (Step S71), the information buffered in the corresponding local memory is accessed one by one in the stored order to check whether it is call event information or call control message (step S72).

In this case, when the information buffered in the local memory is call event information, that is, when it is determined that a call event by a subscriber or a device has occurred, the main process 53 generates a work performing process 54 for processing a corresponding call event. (Step S73).

In addition, when the information buffered in the local memory is a call control message, that is, when it is confirmed that a call control message is generated by the soft switch, the main process 53 performs a task performing process 54 for processing a corresponding call control message. It produces | generates (step S74).

On the other hand, the work execution process 54, which is a child process independently generated independently of each other by the main process 53, performs a corresponding call event or call control message processing operation, in this case refer to the call progress step table 55 Then, the operation is performed while transitioning to the standby-drive-end state (step S75), and after the call event or call control message processing task given to the user is performed (step S76).

In summary, in the present invention, the access gateway generates a task execution process 54 which is a child process for processing this for each call event and call control message in order to reduce excessive process operating time. For example, in FIG. The execution process 54, the hook off process, the digit process, the hook on process, and the signal process, are generated for each call event on the subscriber side and the call control message of the soft switch, and the work execution process 54 thus generated is a unique function. It terminates itself after performing a call event or call control function. Therefore, it shows short processor occupancy regardless of the overall call progress, and it is possible to reduce the number of production processes generated at any point in time.

In the above-described access gateway, each task performing process 54 is generated by one main process 53, which is processed by the event buffer process 51 and the message buffer process 52. The collected information sequentially accesses the buffered local memory to generate the work execution process 54 in real time, and enables sequential processing according to the order buffered in the local memory.

In addition, the present invention implements and applies the call progress step table 55 for each subscriber in order to prevent interference that may occur when mutually exclusive work execution processes 54 are generated at the same time. As shown in FIG. 8, when a busy tone transmission control message by a soft switch is received and a hook-on occurs at the subscriber side at the moment when the tone device normally transmits a busy tone to the subscriber, all of the subscribers related to the corresponding subscriber are connected. The resource is released. However, when a normal response is received by the tone device, the tone resource is occupied by the corresponding subscriber, which indicates an inconsistency in which the device resource is occupied even though the subscriber is actually hooked on.

Accordingly, in the present invention, by applying the subscriber-specific call progress step table 55 as shown in FIG. 6 to prevent the inconsistency as shown in FIG. 8, the access gateway can know whether the subscriber is in / out of the call and the corresponding call. With reference to the advancing step table 55, the state transition table 55 can be predicted for each characteristic, and error processing is performed when an abnormal transition request is made.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention generates a child process for each call event and call control message by the soft switch at the subscriber and device side in the access gateway to perform a corresponding task, and then terminate the process itself, so that the call event and call In addition to enabling sequential processing of control, it is possible to reduce excessive process operating time, thereby improving system resource availability and performance.

In addition, the present invention can prevent the mutual interference due to the simultaneous execution of call events and call control by performing the corresponding function processing while transitioning to the standby-drive-end state with reference to the call progress step table in each child process. Therefore, it is possible to secure the stability of the system operation, such as preventing abnormal call processing due to the collision of call events and call control function processing.

Claims (6)

An event buffer process for collecting various call event information generated in an irregular operation at the subscriber and the device in the order of occurrence; A message buffer process for collecting MEGACO messages for call control of the soft switch in the order of their occurrence; A child process created mutually exclusively for call event or call control message processing, comprising: a task performing process that terminates itself after performing a given call event or call control message processing function respectively; And a main process that buffers the call event or call control message collected by the event buffer process and the message buffer process in a local memory, and sequentially reads and generates a work performing process for processing a corresponding call event or call control message. And a call event and call control processing system at an access gateway. The method of claim 1, It further includes a call progress step table that manages not to transition to the next step until the current driving step ends by setting a status flag for each call progress step for each subscriber such as the call event and call control message processing. And a call event and call control processing system at an access gateway. The method according to claim 1 or 2, The task execution process refers to a call progress step table and performs a corresponding task while transitioning to a standby-driven-end state so that there is no interference by different process tasks. Processing system. Collecting and buffering a call event and a call control message generated during a call in a local memory; Sequentially accessing the local memory to create separate work execution processes mutually exclusive for processing a call event or call control message; The process of performing individual work includes terminating after performing a call event or call control message processing task. The method of claim 4, wherein The buffering of the call event and call control message comprises: collecting call event information generated by a subscriber or a device in an event buffer process; Collecting a call control message generated by the soft switch in the message buffer process; Buffering the collected call event information or call control message information in a local memory in a main process. The method of claim 4, wherein The task execution and termination of each task execution process may include: performing a call event or call control message processing operation while transitioning to a standby-drive-end state with reference to a call progress step table in each task execution process; And terminating the process by itself after performing a call event or call control message processing task given to it in each work execution process.

Images