KR100678236B1 - Service exchanger for managing call processing in intelligent network switching system and its operation method - Google Patents

Abstract

A service switching unit (SSF) that manages call processing operations in an intelligent network switching system, including an intelligent network service processing module that manages call processing operations of a basic call processing unit (BCSM) and finite state machines (FSM), is a UNIX operating system. A service switching unit including a call control unit, a service switching unit manager, and an error coordination library receiving operation support through the control unit; A BCM manager for generating a calling party basic call processor process according to a predetermined event message; A BCSM call control process for executing call control processes of the basic call processing units in a separated form according to an incoming and outgoing call based on the ITU-T basic call state model; An intelligent network service exchange module that manages the basic call processing unit and delivers an event message to the basic call processing unit through an interface with a TCAP transmission / reception module; And an intelligent network switching manager for generating an instance of an intelligent network service exchange module when an arbitrary network service request is made in the basic call processing unit instance and outputting a message according to the intelligent network service request to a service controller.

Description

Service Switching Unit for Managing Call Processing in Intelligent Network Switching System and Its Operation Method

The present invention relates to an intelligent network switching system service switching function (SSF) for processing an intelligent network (IN) service according to the ITU-T IN CS1 recommendation. In particular, in the above recommendation, the SSF Management Entity SSF that manages call processing operations of all BSMs and finite state machines (FSMs) in the SSF associated with intelligent network services, while satisfying the recommendations. To a call processing module implementation.

Looking at Q.1219 of the ITU-T CS1 Recommendation, the SSF structure for receiving an Intelligent Network (IN) Service is the SSF for each Basic Call State Model (BCSM). -It is recommended to have a finite state machine (SSF-FSM).

For reference, in the present specification, a finite state machine refers to a process in which the number of states that can have is finite, which is referred to as the basic call processing unit (BCSM) or other functional units mentioned in the present specification. This is because the process is created under the environment. On the other hand, the above recommendations are described in more detail: Intelligent Network Switching Manager (IN-SM), Intelligent Network Service Switching Module (IN-SSM), and SSME (SSF Management Entity)- Terminology, such as Control, is mentioned, and the terminals have an interface with a functional entity in a service control unit (SCF) or a service exchange unit (SSF) that accesses the service control unit (SCF). It is said to provide an intelligent network service or provide an abstract view of the service switching unit (SSF) call progress to the service control unit (SCF). In addition, from the viewpoint of the SSME-Control concept, it is mentioned that the message is analyzed from the service control unit (SCF) to the service switching unit (SSF) or the message analysis from the service switching unit (SSF) to the service control unit (SCF) is performed. That is, they are recommended for the purpose of overall management or control of basic call processing units (BCSMs) related to calls in the service switching unit (SSF) in intelligent network service.

However, although the recommendation refers to the overall call control module which is considered necessary for the implementation of the intelligent network service, there is no description of the specific implementation method. Therefore, it is not easy to process the intelligent network service in the service switching unit (SSF) based on the information recommended by the ITU-T as described above, because the recommendation is to provide the service between the service control unit (SCF) and the service switching unit (SSF). Although the active SSF-FSM, which has an interface with the service control unit (SCF), receives and processes the received TCAP message directly, each SSF-FSM has an independent structure that has only information on the part that is represented and can only control it. The pursuit of ambiguousness is due to ambiguity when the service in progress requires a specific action of the SSF-FSM of all relevant parts beyond the control of that particular part.

For reference, a structural diagram of the service switching unit (SSF) according to the above recommendation is shown in FIG. That is, FIG. 1 shows a service exchanger (SSF) showing a control data flow when an SSF-FSM of a basic call processor (BCSM) has an interface with a service controller (SCF) when processing an intelligent network service according to the ITU-T IN CS1 recommendation. As shown in ITU-T IN CS1, the SSF-FSM paired with the BCSM has a direct interface with the Service Control Unit (SCF). One drawing.

In the structure as shown in FIG. 1, 53 intelligent network access protocols to be carried in a component part of a TCAP message exchanged between a service control unit (SCF) and a service control unit (SCF) for the progress of an intelligent network service (Intelligent Network Access Protocol) Most of; INAP) messages are activated SSF-FSMs that have interfaces with Service Logic Program (SLP) instances that directly process and control intelligent network services within the Service Control Unit (SCF). You will see that it will take care of this directly. For reference, the 53 INAP messages are numerical values based on the number of messages defined in ITU-T.

As a result, the existing SSF-FSM is to receive an Initial Call Attempt message directly, which indicates an ambiguous way of implementing the Service Switching Unit (SSF).

Therefore, as an example of the intelligent network service according to the above recommendation, in constructing a conference IN service scenario, a message such as Add Party, Attach, Detach, Hold Call Party Connection INAP, etc. is used, and these messages are specific SSF. It is difficult to handle it alone in FSM. That is, they need to comprehensively use and control the information of all users related to the service beyond the scope of any specific user and control represented by SSF-FSM.

In addition, the Initial Call Attempt INAP Message during the intelligent network service must be accompanied by a Request Report BCSM Event and a Continuous INAP Message. Since the service switching unit (SSF) requests processing to the service switching unit (SSF) by the intelligent network service scenario instance of the service control unit (SCF) without reporting the processing progress (SSF) or the processing progress of the service switching unit (SSF). It requires a structure that waits for the completion of processing of an individual message that manages information of a user related to a service while having a structure that is self-queued in the (SSF). Didn't exist.

Accordingly, an object of the present invention is to provide a service switching function (SSF) for processing an intelligent network (IN) service according to the ITU-T IN CS1 recommendation. In the service switching unit (SSF) to manage the call processing operation of all the basic call processing unit (BCSM) and finite state machine (FSM) in the service switching unit (SSF) associated with the intelligent network service while satisfying It's in the module implementation.

In another aspect, the object of the present invention, although mentioned in the above recommendation, by recognizing that the overall management and control of the call in progress in the intelligent network service is ambiguous, only a predetermined module that can solve this problem, the service exchange unit ( SSF).

Accordingly, the implemented module manages physical and logical information of all users related to any intelligent network service, and receives the managed network information directly from the service control unit (SCF). To handle

In order to achieve these objects, the present invention includes an intelligent network service processing module that manages call processing operations of a basic call processing unit (BCSM) and finite state machines (FSMs). An SSS, comprising: a service switching unit including a call control unit, a service switching unit manager, and an error coordination library supported by an operation through a Unix driving system; A BCM manager for generating a calling party basic call processor process according to a predetermined event message; A BCSM call control process for executing call control processes of the basic call processing units in a separated form according to an incoming and outgoing call based on the ITU-T basic call state model; An intelligent network service exchange module that manages the basic call processing unit and delivers an event message to the basic call processing unit through an interface with a TCAP transmission / reception module; And an intelligent network switching manager for generating an instance of an intelligent network service exchange module when an arbitrary network service request is made in the basic call processing unit instance and outputting a message according to the intelligent network service request to a service controller.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, and may vary according to the intention or custom of a user or a program designer, and the definitions should be made based on the contents throughout the present specification.

First, in order to implement the service switching unit (SSF) of the intelligent network switching system according to the present invention, it has a management function of the SSF-FSM of the basic call processing unit (BCSM) included in the service, each instance independently and directly the service control unit An intelligent network switching service module (IN-SSM) which allows the service control unit (SCF) to manage the basic call processing units (BCSMs) by logical call IDs and leg IDs. To create).

The state in which the IN-SSM is generated and operated is illustrated in the accompanying FIG. 2, which is roughly illustrated as the structural diagram of FIG. 1 mentioned above.

That is, FIG. 2 is a structural diagram of a service switching unit (SSF) showing a data control flow when an SSF-FSM of a basic call processing unit (BCSM) has an interface with a service control unit (SCF) when processing an intelligent network service according to the present invention. It is a figure which shows.

Referring to FIG. 2, first, upon detection of a service request, an IN-SM 250 is generated to process a service start message primarily. The generation of the intelligent network switching manager (IN-SM) 250 is to generate entities for the service flow to be generated later through the intelligent network switching manager (IN-SM) 250. On the other hand, the intelligent network switching manager (IN-SM) 250 proposed in the recommendation is to be a process that interacts with the service control unit (SCF) in performing the process of providing the intelligent network service features to the user, which is the intelligent network switching The manager (IN-SM) 250 performs the operation of notifying the service control unit (SCF) of call / connection processing of the CCF / SSF, and is proposed to use the capabilities and resources of the SSF / CCF. . It also manages the service switching unit (SSF) resources required to detect intelligent network call / connection processing events to be reported to the service control unit (SCF) or to support the intelligent network service logic instances in order to activate the intelligent network service logic (SLP) instance. Although it was suggested to have a function. As mentioned above, the actual implementation of IN-SM mentioned in the above recommendation is not presented, so the present invention is the generation of the IN-SM 250.

When the IN-SM 250 is generated according to the present invention when a TCAP Begin message is detected by the IN-SM 250 when a random network service request is made in a predetermined basic call processing unit (BCSM) instance, the IN-SM 250 may request the service. Create an IN-SSM 260 instance, which is a separate process for handling, and send the generated IN-SSM 260 the received TCAP Begin message to the service control unit (SCF). Have the ability to Therefore, when the service control unit (SCF) informs the service exchange unit (SSF) of the start of the service, the first module to receive and analyze the message is IN-SM 250, and similarly any basic element in the service exchange unit (SSF) The first execution of the message requesting the service control unit (SCF) to start the service in the call processing unit (BCSM) is also the IN-SM 250. As a result, the IN-SM 250 implemented according to the present invention only performs an operation of creating an IN-SSM 360 instance to manage the intelligent network service.

The IN-SSM 260 generated by the IN-SM 250 has the following functions.

First, the IN-SSM 260 has a substantial interface with the service control unit (SCF) and is implemented to collectively manage basic call processing units (BCSMs) placed under any service. In addition, it is implemented to process a service control message received from the service control unit (SCF) and, in some cases, the SSF-FSM of each basic call processing unit (BCSM) to hand over to the direct processing. In other words, an independent instance of IN-SSM 260 per service is created by IN-SM 250, and the service processing right is transferred from IN-SM 250 before the activity starts.

Referring to the function of the IN-SSM 260 implemented according to the present invention in detail below, each instance of the IN-SSM 260 manages basic call processing units (BCSM) related to the call requesting service. In addition, through the interface with the TCAP Rx / Tx unit (shown in the figure as the message transmitter 230 / message receiver 240), the event message for service progress from the service logic unit (SLP) is sprayed to the appropriate basic call processing unit (BCSM) for processing. In some cases, it may be processed directly. In addition, each of the basic call processing units (BCSM) receives a report (Report) necessary for the service progress is also delivered to the service logic (SLP). In FIG. 2, the basic call processing unit (BCSM) is implemented by the outgoing BCSM call control unit 272 and the incoming BCSM call control unit 274, the service logic program is introduced through the SCP / ADJUNCT 220. The BCM manager 30 becomes a module that manages the generated originating-BCSM call controller 272 and the incoming-BCSM call controller 274 under the control of the IN-SM 250. IP 110 is a module according to the recommendation and becomes a module that provides the information necessary for the intelligent network switching system. In addition, a signal transmitted and received between the modules includes a command signal and a response signal thereof, and in the drawing, a trigger detection point (TDP) and an event detection point (EDP) detect a detection point for knowing a call processing time point at which an event is detected. I speak.

On the other hand, the destruction time of the IN-SSM 260 instance created according to the present invention is a case where the managed basic call processing unit (BCSM) instance is no longer in the actual state, the processing of the service progress message depending on the service It may be later.

3 is a state transition diagram of an intelligent network service switching module (IN-SSM) for managing a call processing operation implemented in a service switching unit (SSF) of an intelligent network switching system according to the present invention. In order to operate, it is implemented as a finite state machine (FSM), and thus the state transition diagram.

Referring to FIG. 3, the IN-SSM according to the present invention includes an idle state 310, an internal queue state 320, a waiting for any event state 330, and a special resource wait state. (Waiting For Specialized Resource State) 340 has a state structure that transitions to.

The idle state 310 is a state in which the IN-SSM has only information of users requesting to start a service at the time of initial generation, and gradually includes and manages information of users to be managed as the service progresses. At this time, the update of the information of the existing users or the addition of the information of the new users is taken when the user is sent in the event message (EDP-N / R; Event Detection Point-Notification / Request) reported to the service control unit (SCF). When the user detects the TDP-N / R, the idle state 310 transitions to the event waiting state 330 through e1 when reporting to the service control unit (SCF), and initiates an initial call attempt INAP message from the service control unit (SCF). When is received, the internal queue state 320 transitions through e7.

Recommendations for INAP messages, such as Initial Call Attempt Message, should be paired with Request Report BCSM Event Message and Continuous Message. Recommended in 6.5.5 of Q.1219. Therefore, in case of initial call attempt message, new user registration is required, and for the registration of this user, first, a predetermined module to act as a calling party must be processed so that this module sequentially processes three messages which have been fraudulent. Until this module is created, there is no target to process the above-mentioned request recording basic call processing unit (BCSM) event messages and continuation messages, so it is necessary to queue these messages until a response is generated that this module is generated. Is made through e3 in the figure. Upon receiving the response, the event message transitions to the event waiting state 330 through e5 and sequentially processes the queued event messages. This is done via e4.

While the intelligent network service is in progress, the event waiting state 330 processes the report to the service control unit (SCF) according to the continuous detection of an EDP (Event Detection Point) from the users involved in the service and processes the INAP message through e4. The event wait state 330 transitions to the internal queue state through e2 when the initial call attempt message needs to be processed.

Some intelligent network services require the use of special resources, and these resources are collectively managed by the resource manager, so they have to wait until the allocation is received. At this time, the special resource wait state transitions to 340. The special resource wait state 340 waits through e8, where the received INAP message is queued through e10.

On the other hand, the information of the users managed for the service processing in the IN-SSM includes a directory number, a port number, a queue ID, a queue ID of a process acting on behalf of a user, and a service status. This is information such as status information including user status and location in Etc. In addition, information for collectively managing users under a service includes call ID, service information, and resource information.

A functional block diagram of a service switching unit (SSF) in which the IN-SSM mentioned in FIGS. 2 and 3 is actually implemented is illustrated in FIG. 4.

That is, Figure 4 is a diagram showing the internal functional configuration of the service switching unit (SSF) in the intelligent network switching system according to an embodiment of the present invention.

Referring to FIG. 4, a function configuration in the service switching unit (SSF) in the intelligent network switching system in which the generated intelligent network service switching module (IN-SSM) and the intelligent network switching manager (IN-SM) for generating the same are generated and implemented; That is, the configuration of the service switching unit (SSF) according to the present invention can be seen. For reference, the configuration of the service switching unit (SSF) shown in FIG. 4 represents a configuration comprised of software. Thus, each component is actually implemented as a process and a collection of modules with the corresponding functions.

4 is a preferred embodiment of a service switching unit (SSF) according to the present invention, which includes a call control unit (CCF) simultaneously with the service switching unit (SSF).

Reference numeral 400 denotes a service switching unit (SSF) / call control unit (CCF), which is largely BCM Manager 401, BCSM Call Control 402, Resource Manager 404, Data Manager ( Data Manager) 405, IN-Switching Manager 403, IN Service Switching Module 406, and Function Entity Access Manager (FEAM) 410. In addition, the Service Switching Unit (SSF) Manager, the Error Correction Library, and the Unix Driving System are configured to support the above components. First, BCM Manager (BCM Manager) 401 creates a calling party basic call processing (BCSM) process according to the originating attempt event from the predetermined switch or the initial call attempt event message during the intelligent network service. The BCSM call control process 402 is a process based on the ITU-T Basic Call State Model (BCSM), and functions as a call control process of basic call processing units (BCSMs) having a form separated into a calling party and a called party. The resource manager 404 assigns and manages a shared switch resource to the requested BCSM call control process 402. Examples of managed resources include DTMF receivers, PSTN trunks, and the like. The data manager 405 is composed of a relational database management system (RDBMS) for subscriber and switch port information, and includes a function of manipulating switch resource information. The FEM 410 uses TCP / IP 419 for reliable message transmission and sequential delivery of TCAP and DSS1 messages. It also enables the exchange of asynchronous TCAP messages and the concurrency of the TCAP interfaces. It uses the TCAP message coordination process 411 and the TCAP API library 414. The DSS1 message coordination process 412 and the DSS1 API library 415 are used to enable the asynchronous exchange of DSS1 messages and the simultaneous DSS1 interface. HLM receive process 417 receives events from the switch while maintaining the switch and LAN interface. The control message to be sent to the switch involved in call processing is made using the switch API library 416 and sent to the HLM sending process 418. In addition, the environmental manager 450, which has been requested for the environmental data, may send a response to the switch through the HLM transmission process 418. When the switch message coordination process 413 receives a message from the switch through the HLM reception process 417, the switch message coordination process 413 determines whether the message is related to call processing or a message related to the environment. It informs where the message should be routed according to the decision result.

Next, the intelligent network switching manager (IN-SM) 403 is a module according to the present invention, when sending a TCAP Begin message to the intelligent network switching manager (IN-SM) 403 at the request of any intelligent network service in the BCSM instance, The intelligent network switching manager (IN-SM) 403 creates an intelligent network service exchange module (IN-SSM) 406 instance to handle the requested service, and receives the TCAP Begin received by the intelligent network service exchange module (IN-SSM) 406. Send a message to the service control unit (SCF). The role of the intelligent network switching manager (IN-SM) 403 is simply to create an intelligent network service exchange module (IN-SSM) 406 instance to manage the intelligent network service.

The intelligent network service switching module (IN-SSM) 406 is generated by the intelligent network switching manager (IN-SM) 403, and each instance manages basic call processing units (BCSMs) related to the call requesting the service. In addition, the service progress event message from the service logic programs (SLP) is sprayed to the appropriate basic call processing unit (BCSM) through the interface with the TCAP transmission / reception module implemented in the intelligent network switching system, or processed. In some cases, it can be processed directly. In addition, it receives reports required for service progress from each BCSM and delivers them to the service logic program (SLP). The time of destruction of each IN-SSM 406 is such that the managed BCSM instances no longer exist (in this case, each BCSM instance reports on destruction). Depending on the service, it may be after processing the service progress message.

The service switching unit (SSF) manager 420 manages the start and restart of processes configured in all SSF / CCF 400s except the BCSM call control process 402, which is controlled by the BCSM call control process 402, and the SSF / Perform a sequential shutdown of the processes of the CCF 400. The start of the service switching unit (SSF) manager process 420 takes place when the host computer is started or when the service switching unit (SSF) manager 420 is manually started.

Error Handling Library 430 includes functions to handle three categories of errors, divided into minor, serious, and fatal errors. Serious errors can be resolved by terminating and restarting the process because it stops executing the process. Minor errors do not block the execution of the process, so they are solved by simply sending a message to the error logger. The fatal error affects the entire system beyond recovery, so it is manipulated by reporting the error to the error logger and terminating all processes. This function is executed in the error correction library 430. The UNIX 440 provides a basis for generating and operating respective processes and modules corresponding to the service switching unit (SSF) / call control unit (CCF) 400, the service switching unit (SSF) manager 420, and the error coordination library 430. .

According to the above, the effects of the present invention are as follows.

First, by generating IN-SSM as an upper module that independently owns and controls each user's information, there is an advantage in that INAP message processing beyond the processing for a specific user can be easily performed.

Second, the service control unit (SCF) has an advantage of providing a concrete basis for having a conceptual view of each user in the concept of a leg through the IN-SSM. For reference, the leg concept is mentioned in section 4 of Recommendation Q.1214.

Thirdly, each user manages the user information of the service being executed collectively, while allowing independent and concealed information to be managed by other users in the basic call processing unit (BCSM). By taking a dual structure, there is an advantage of increasing the utility of information sharing and independence according to the service situation.

Fourth, the IN-SSM is created and destroyed individually per service as well as service start / end, so that the objectization of the IN-SSM itself is implemented, and through this, information of users in the IN-SSM is disclosed. The opening of the information has the advantage that a system is provided to allow only users with separate control rights.

Fifth, the present invention also makes it easy to manage users included in the service with logical call IDs and leg IDs.

Sixth, it is possible to expand the structure of the service switching unit (SSF). In other words, it satisfies the initial structure of IN-SSME (SSF Management Entity) mentioned in the ITU-T IN CS1 Q.1218 Recommendation, and can be used to prepare the ITU-T Recommendation for the future intelligent network switching system. .

1 is a block diagram of a service switching unit (SSF) showing control data flow when an SSF-FSM of a basic call processing unit (BCSM) has an interface with a service control unit (SCF) when processing an intelligent network service according to the ITU-T IN CS1 recommendation. Structure diagram.

2 is a structural diagram of a service switching unit (SSF) showing the data control flow when the SSF-FSM of the basic call processing unit (BCSM) has an interface with the service control unit (SCF) when processing the intelligent network service according to the present invention.

3 is a state transition diagram of an intelligent network service switching module for managing a call processing operation implemented in a service switching unit (SSF) of the intelligent network switching system according to the present invention.

Figure 4 is a block diagram of the internal function of the service switching unit (SSF) in the intelligent network switching system according to an embodiment of the present invention.

Claims (8)

In the service switching unit (SSF) for managing call processing operations in the intelligent network switching system, including the intelligent network service processing module for managing the call processing operations of the basic call processing unit (BCSM) and the finite state machine (FSM), A service switching unit including a call control unit, a service switching unit manager, and an error coordination library supported by operation through a UNIX operating system; A BCM manager for generating a calling party basic call processor process according to a predetermined event message; A BCSM call control process that executes call control processes of the basic call processing units in a separate form based on ITU-T basic call state model; An intelligent network service exchange module that manages the basic call processing unit and delivers an event message to the basic call processing unit through an interface with a TCAP transmission / reception module; And an intelligent network switching manager configured to generate an instance of an intelligent network service exchange module when an arbitrary network service request is made in the basic call processor instance, and output a message according to the intelligent network service request to a service controller. The method of claim 1, wherein the functional entity processing manager, A service exchange unit that provides a ticap interface and simultaneously exchanges asynchronous ticap messages, and sequentially transmits a message and transmits a ticap / DSS1 message through TCP / IP. According to claim 1, wherein the intelligent network service exchange module, Process the service progress event message from the service logic program directly through the interface with the TCAP transmission / reception module implemented in the intelligent network switching system, and receive the report required for the service progress from each basic call processing unit to the service logic program. Service exchanger with an intelligent network service processing module, characterized in that the transfer. According to claim 1, wherein the intelligent network service exchange module, And a basic call processing unit instance managed by the intelligent network service switching module that is destroyed when the service call message is no longer present or is processed. According to claim 1, wherein the service exchange manager, And performing a sequential shutdown of the processes for the start management of the processes under the control of the BCSM call control process or the management request or error of the system. In the operation method of the service switching unit for managing the call processing operation in the intelligent network switching system, Generating an intelligent network switching manager for processing a start message according to the service request when a service request is detected from a basic call processor; Generating, by the generated intelligent network switching manager, an intelligent network switching module instance which is a processor for handling the requested service; In the intelligent network switching system comprising a process of outputting a TCAP message for managing the basic call processing of the instance received by the intelligent network switching module to the service control unit, the service control unit outputs the service start to the service exchange unit. Operation method of the service switching unit managing the call processing operation. The method according to claim 6, wherein the information of the users for service processing in the intelligent network service exchange module includes a directory number, a port number, and a queue ID of a process acting on behalf of the user. ), Status information including user status and location in a service situation, and call ID (Call ID), service information, and resource information for overall management of users under the service. Operation method of the service switching unit managing the call processing operation. The method of claim 7, wherein the sending of the TCAP message to the service controller comprises receiving and analyzing the message when the service controller informs the service switcher of the service start by the intelligent network switching manager (IN-SM). Operation method of the service switching unit for managing the call processing operation in the intelligent network switching system characterized in that the operation process.