KR20040054258A - Method of Controling IN Switchboard System using Split Leg Control - Google Patents

Abstract

PURPOSE: A method for controlling an intelligent network switching system by using split-leg control is provided to generate split-leg control if a CCF(Call Control Function) receives a split-leg command, and to manage plural legs, thereby minimizing a communication path between an SSF(Service Switching Function) and the CCF. CONSTITUTION: A CCF receives a split-leg operation from an SSF(S10). The CCF generates a new call segment according to the split-leg command, and separates an incoming call from an outgoing call(S20). The CCF relays plural call segments with the SSF, and generates split-leg control that divides the operation command received from the SSF into the corresponding call segments(S30). The split-leg control is reported with an event that should provide a call information report to the SSF from the plural call segments, and transmits the call information report to the SSF(S40).

Description

Control method of intelligent network switching system using split leg control {Method of Controlling IN Switchboard System using Split Leg Control}

The present invention relates to a control method of an intelligent network switching system such as an INCS (Intelligent Network Capability Set) -1 or IN CS-2 type switching system recommended in the International Telecommunication Union-Telecommunication standardization section (ITU-T). The present invention relates to a method for integrated management of a plurality of legs branched from one call segment by using split-leg control in an intelligent network switching system.

First, the basic operation of the intelligent network will be described. IN CS-1 mainly recommends the network capability for the voice service that can be provided in the fixed network.In order to implement the service-independent network, the intelligent network conceptual model, BCSM (Basic Call State) Model and INAP (IN Application Protocol) are established.

In addition, in the second stage of the intelligent network capability, IN CS-2, it is considering providing partial mobile service and multimedia service by extending IN CS-1 to extend not only fixed network but also mobile network.

On the other hand, the intelligent network call processing for providing such services is a call control function (CCF), a service switching function (SSF), and a service control function (Service Control Function) in the switching system This is done by the interaction between SCF). The SCF requests the SSF to notify when a specific event occurs, and the SSF stores this request and reports it to the SCF when it receives notification from the CCF that the event has occurred.

By the way, one call object is classified into incoming call (Leg 1) and outgoing call (Leg 2) in CCF, and the call is made by establishing a call path between incoming call and outgoing call. . However, when a split leg command is received from the SCF, the CCF releases the call path between the incoming call and the outgoing call, and each leg processes a separate operation. The split leg is an operation that allows each leg to perform a separate operation during a call between the incoming call and the outgoing call, which will be described below with reference to FIGS. 1 and 2.

1 illustrates a communication path between SCF 10 and CCF 30 prior to receiving a split leg operation. Typically, one call segment 32 manages incoming calls 36 and outgoing calls 38. However, when the split leg operation is received, as shown in FIG. 2, the CCF 30 generates a new call segment 34 to separately manage the incoming call 36 and the outgoing call 38. At this time, the communication path for the new call segment 34 is further required between the SSF 20 and the CCF 30 in addition to the existing communication path.

However, in the conventional method, since the communication path between the SSF 20 and the CCF 30 increases every time a split leg operation is received, it increases the difficulty of maintaining and repairing the system, and implements a complicated communication service. For example, when a call includes a plurality of legs, not only event reports and call management occurring in each leg are difficult but also difficult to adapt to various service developments expected in the future.

The present invention is to solve the above problems, when the CCF receives a split leg command to generate a split leg control to integrate the plurality of legs to manage the split legs of the intelligent network switching system that can minimize the communication path between the CCF The purpose is to provide a control method.

1 is a block diagram showing a communication path before performing a split leg operation.

2 is a diagram illustrating a communication path after performing a conventional split leg operation.

3 is a block diagram showing a communication path after performing a split leg operation according to an embodiment of the present invention.

4 is a flowchart illustrating a split leg control method according to an embodiment of the present invention.

5 is a conceptual diagram illustrating a split leg control method according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

10: service control function unit 20: service exchange function unit

30: call control function unit 32, 34: call segment

36: incoming call 38: outgoing call

40: split leg control

In order to achieve the above object, a split leg control method according to the present invention of an intelligent network switching system, comprising: a first step of a call control function receiving a split leg operation from a service switching function; A second step of the call control function generating a new call segment according to the split leg command and separating an incoming call and an outgoing call; A third step of generating, by the call control function, a split leg control relaying a service exchange function unit and the plurality of call segments and distributing an operation command received from the service exchange function unit to the call segment; And a fourth step of receiving, by the split leg control, an event for providing a call information report from the plurality of call segments to a service switching function unit, and transmitting a call information report to the service switching function unit.

The intelligent network switch system according to the present invention also includes a service control function, a service exchange function, and a call control function, wherein the call control function is based on a split leg operation received for a call segment from the service switch function. And generating a split leg control for mediating communication between the service switching function unit and the call segment and the added call segment.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 illustrates a communication path between an SCF 10 and a CCF 30 according to an embodiment of the present invention. When the CCF 30 receives the split leg operation, the CCF 30 generates the split leg control 40 and calls the call segments 32 and 34 separately managing the incoming call 36 and the outgoing call 38. By performing the processing and the event report generated in each leg by the split leg control 40 integrated, the communication path between the CCF 40 and the SSF 30 can be maintained as one despite the split leg operation.

The split leg control 40 includes call registers to collectively manage each leg, and stores leg information such as a call segment identifier of each leg 36 and 38, and the SSF. By transmitting the split leg response signal (SplitLegResp.Signal) to the S20, the SSF 20 can grasp the process, event information, etc. of a plurality of legs branched from one call while maintaining a single communication path with the CCF 30. Can be. FIG. 3 illustrates only a case where a split leg control 40 is generated in one split leg operation to control two hose segments 32 and 34, but three or more call segments are received by receiving multiple split leg operations. Even in the case of generation, the split leg control 40 can manage all call segments branched from one call in parallel. Split leg control 40 releases and destroys call registers when multiple call segments 32,34 are reduced to a single call segment or all legs are released by a call segment merge operation. .

A leg control method according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3 as follows. First, when the call segment 32 activated in the CCF 30 receives the split leg operation from the SCF 10 through the SSF 20 (S10), the CCF separates the segment segment 34 according to the split leg command. ), And the incoming call and the outgoing call are separated by the first leg 36 and the second leg 38 (S20). Accordingly, the communication path between the first leg 36 and the second leg 38 is released 101, and each of the hose segments 32 and 34 transitions to the independent operation processing ready state 37 and 39.

Next, the CCF 30 generates a split leg control 40 that distributes the operation command received from the SSF 20 to the first leg 36 and the second leg 38 (S30). The split leg control 40 has a ho register that includes each hog identifier and leg information under its control as described above. The SSF forwards the operation to the split leg control 40 (103), including the call segment identifier that specifies the call segment on which the operation is to be performed along with the process identifier. Accordingly, the SSF does not designate a transmission path of a corresponding call segment among a plurality of transmission paths with the CCF 30 generated for each segment, and as shown in FIG. 3 and FIG. Each operation may be transmitted to a plurality of legs branched from one call object through a transmission path (103). The split leg control 40 receives the operations for all legs branched in one call from the SSF 20 in a batch and compares the call segment identifier included in the received operation with the call segment identifier stored in the register. Distribute the operation to call segments (104, 105).

Next, when an event requesting a report from the SSF 20 occurs in each call segment 32 and 34, an event report generated in each call segment 32 and 34 is directly reported to the SSF 20. Instead, it is collected by the split leg control 40 (106, 107) and reported to the SSF 20 (S40, 108), so that the SSF 20 and the CCF 30 can use only a single communication path in the event report. have. In this case, since the split leg control 40 receives an event report from each call segment 32 and 34, it can know the state of each call segment and can immediately respond appropriately to an abnormal event occurrence. Easy maintenance and repair of the system.

Finally, the split leg control 40 is reduced to a single call segment by receiving a call segment consolidation operation for all call segments under its control (S50), or a release event is reported on all call segments. If it is (S60), the split leg control 40 ends.

As described above, according to the split leg control method according to the present invention, all call segments branched from one call segment are integrated by using split leg control, so that the service switching function unit and the call control unit are controlled despite the split leg operation. By suppressing the increase in the communication path between functional parts, it provides a significant effect of improving the performance of the system, facilitating the maintenance and repair of the system, and improving the adaptability of the system to various anticipated services in the future.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (7)

In the split leg control method of intelligent network switching system, A first step in which the call control function receives the split leg operation from the service switching function; A second step of the call control function generating a new call segment according to the split leg command and separating an incoming call and an outgoing call; A third step of generating, by the call control function, a split leg control relaying a service exchange function unit and the plurality of call segments and distributing an operation command received from the service exchange function unit to the call segment; And And the fourth step of receiving, by the split leg control, an event to provide a call information report from the plurality of call segments to a service exchange function unit, and transmitting a call information report to the service exchange function unit. How to control the split leg of the system. The method of claim 1, A fifth step of deactivating the split leg control by the call control function when the split leg control receives a call segment merging operation from the service switching function unit and integrates the plurality of segments into a single call segment. Split leg control method of the intelligent network switching system, characterized in that. The method according to claim 1 or 2, The split leg control may further include a sixth step of deactivating the split leg control by the call control function when the split leg control is reported that a release event occurs from all the plurality of call segments. Control method. An intelligent network switch system including a service control function, a service exchange function, and a call control function, The call control function generates split leg control for mediating communication between the service switch function and the call segment and the added call segment according to the split leg operation received for the call segment from the service switch function. Network switch system. The method of claim 4, wherein The split leg control, And distribute the operation received from the service switching function unit to the plurality of call segments, and report an event report received from the plurality of call segments to the service switching function unit. The method according to claim 4 or 5, The split leg control, Intelligent network switch system, characterized in that deactivated when receiving a call segment integration operation from the service switching function unit, or when the release event occurs from all of the plurality of call segments. The method according to claim 4 or 5, And said split leg control comprises a call register for storing a call segment identifier.