KR100248417B1 - Various call connection method using process identifier succeeding function - Google Patents

Abstract

The present invention analyzes the call setup message from the user and the service profile information registered in the ATM switching system, sets the point-to-point connection when the two subscribers are connected, and examines the point-to-multipoint service allowance condition when the party is added. When satisfied, transition to the point-to-multipoint call / connection control process using the process identifier inheritance function. That is, it is possible to easily transition to another call / connection type call processing process in the busy state, so that when a request for switching to a new type of service is requested, a new service is continuously provided without having to release and reset the preset call. . In addition, limited cell replication resources in the system can be allocated only to a point of view that includes three or more subscribers in point-to-multipoint call / connection control, thereby using the limited resources to meet the service needs of more users. With the emergence of new services in the future, the effects of flexible processing between services will be further increased.

Description

Various Call / Connection Control Methods Using Process Identifier Succession in ATM Switching System

The present invention relates to various call / connection control methods using a process identifier succession function in an ATM switching system. In particular, when a CTT1 and CTT2 connection phase is processed, a transition function is provided to call processing processes of different connection phases according to various service requirements of a user. The present invention relates to various call / connection control methods using a process identifier succession function in an ATM switching system that enables a user to conveniently use the service.

Conventionally, only services based on point-to-point connections were provided in PSTN or N-ISDN networks. However, various call / connection control needs have emerged to provide more diverse services in B-ISDN, and now, only the global CTT1 and CTT2 processing functions, which are unidirectional point-to-multipoint connection phases, have been studied. It is a situation.

According to the B-ISDN signaling protocol of the ATM switching system, it is determined whether to perform CTT1 or CTT2 processing when a call is set up according to a required service type. In the case of unidirectional point-to-multipoint connection phase, even if the subscriber belonging to the call has only the root party and the first leaf party, the CTT2 control is performed to occupy cell replication resources internally. In addition, when a subscriber is added while providing a service on a one-way point-to-point connection phase, a transition to a point-to-multipoint service is not allowed, so an existing call must be restored and a new point-to-multipoint call establishment request should be attempted.

An object of the present invention is a process identifier successor function in an ATM exchange system that provides a transition function to a call processing process on a different connection phase according to various service needs of a user when processing a CTT1 and CTT2 connection phase. It provides a variety of call / connection control method using.

Means for achieving the object of the present invention is the first step to perform the process to the point-to-point call / connected busy state or point-to-multipoint call / connected busy state according to the user's request, and the point-to-point call / And a second step of performing party addition or call recovery request reception processing in the connected busy state, and a third step of performing party addition, party deletion or call recovery request receiving processing in the point-to-multipoint call / connection busy state.

1 is a block diagram of an ATM switching system.

2 is a flowchart for performing processing up to a point-to-point call / connected busy state or a point-to-multipoint call / connected busy state according to a user's request.

3 is a flow chart for performing party addition or call recovery request reception processing in a point-to-point call / connected call.

4 is a flowchart for performing party addition, party deletion, or call recovery request reception processing in a point-to-multipoint call / connection call state.

(Explanation of symbols for the main parts of the drawing)

1,1 ': ALS 2: ACS

3,3 ': ASNM 4: ISNM

5-1 ~ 5-8: LIM6-1 ~ 6-4: IM 7,7 ': CCCP

7a, 7a ': UCCM 7b, 7b': LRHM

7c, 7c ': DHM 7d, 7d': SPCCM

7e, 7e ': NTRCM 7f, 7f': ASMM

8: OMP 8a: NTRCM

8b: DHM 8c: OMCM

For B-ISDN service, ITU-T proposed five connection topology types (CTT). Currently, the implementation of point-to-point (PtP) connection phase (CCT1) and unidirectional point-to-multipoint (PtMP) connection phase (CTT2) are considered.

In addition, call / connection processing methods for multipoint-to-multipoint (MPtMP), multipoint-to-point (MPtP) and bidirectional point-to-multipoint connection phases are also being studied. It also requires cell merging. The current recommendation is to specify the CTT type when setting up a call. In the case of unidirectional point-to-multipoint connection phase (CTT2), cell replication resources are performed by performing CTT2 control even when the subscriber belonging to the call has only the root party and the first leaf party. To occupy. In addition, it is not allowed to add point-to-multipoint service by adding subscribers during the service of one-way point-to-point connection phase (CTT1). Therefore, the existing call should be restored and a new point-to-multipoint call establishment request should be attempted.

The present invention provides a flexible transition method between call processing processes configured for each CTT using a process identifier inheritance function in an Asynchronous Transfer Mode (ATM) exchange system. As a result, there is a simple interconnection between these processes and services can be conveniently provided. In addition, in the case of a point-to-multipoint call / connection, limited cell replication resources may be allocated only to a point of service including 3 subscribers or more, thereby enabling efficient use of resources.

Analyzing call setup message from user and subscriber service profile information registered in ATM switching system, it establishes point-to-point connection when connecting two subscribers, and checks point-to-multipoint service acceptance condition when party needs additional party. In order to transition to the point-to-multipoint call / connection control process using the process identifier inheritance function. That is, it is possible to easily transition to another call / connection type call processing process in the busy state, so that when a request for switching to a new type of service is requested, a new service is continuously provided without having to release and reset the preset call. .

In addition, limited cell replication resources in the system can be allocated only to a point of view that includes three or more subscribers in point-to-multipoint call / connection control, thereby using the limited resources to meet the service needs of more users.

1 is a block diagram of an ATM switching system.

It is distributed in an ATM Local Switching Subsystem (ALS) 1, which is an independent switching subsystem unit, and is interconnected by an ATM Central Switching Subsystem (ACS) 2 that is a central switching subsystem. The transport network is an access switch network module (ASNM), which is a switch network of ALS, an interconnection switch network module (ISNM), which is a switch network of ACS, and a link interface module (LIM), which performs link matching between the ASNM and the ISNM. (5) and an IM (Interface Module) 6, which is a subscriber or relay line matching module.

The control network includes the Call Connection Control Processor (CCCP) (7), which contains several software modules that perform various call / connection control and signal processing, and a number of software that perform the operation and maintenance functions of the system, number translation and route control. OMP (Operation and Maintenance Processor) (8), inter-processor communication is performed via a switch network.

FIG. 2 is a flowchart for performing processing up to a point-to-point call / connected busy state or point-to-multipoint call / connected busy state according to a user's request, and FIG. 3 shows a party addition or call in a point-to-point call / connected busy state. 4 is a flowchart for performing recovery request reception processing, and FIG. 4 is a flowchart for performing party addition, party deletion, or call recovery request reception processing in a point-to-multipoint call / connection call state.

First, upon receiving a call setup request from a user in idle state (Idle) of FIG. 2 (S1), a user plane connection shape value of an information element indicating a broadband bearer connectivity characteristic (BBC) included in a call setup message It analyzes the presence or absence of Endpoint Reference (ER) information, the number of called subscriber numbers, and the subscriber service profile information registered in the system to determine the process type to be run for call processing (S2).

If the BBC information element represents the point-to-multipoint connection shape, the endpoint reference value is 0, and the enclosing request includes multiple called party numbers, create a point-to-multipoint call processing process (S3). A point-to-multipoint call / connection setup process using the function is performed (S4), a call setup request is sent to related leaf parties (S5), and a point-to-multipoint connection setup wait state is reached (S6). At this time, upon receiving call connection notifications from related leaf parties (S7), a cell header conversion table for routing ATM cells is set (S8) and a point-to-multipoint call / connection is in a busy state (S9).

Point-to-point call processing if the BBC information element is a point-to-point connection or if the BBC information element represents a point-to-multipoint connection and the value of the endpoint referrer is a sequential processing request with zero or one called party number. Create a process (S10) to perform point-to-point call / connection setup processing in one-way or two-way between point-to-point (S11), send a call setup request to the other subscriber (S12), and wait for a point-to-multipoint connection setup. (S13). At this time, upon receiving the call connection notification from the counterpart subscriber (S14), a cell header conversion table for routing the ATM cell is set (S15) and the point-to-point call / connection is in a busy state (S16).

In addition, if the result of the call setup message information element analysis is invalid, it is determined as an unexpected (Unexpected) message and ignored (S17).

When the party add request is received from the root party in the point-to-point call / connected call state of FIG. 3 (S18), it is checked whether the point-to-multipoint service is allowed with reference to the registered service profile (S19). If the point-to-multipoint service is allowed and the set call is one-way point-to-point or point-to-multipoint, the point-to-multipoint call processing process is created using the process identifier inheritance function (S20), and the point-to-multipoint call / The connection process is performed (S21) and the result of the investigation is investigated (S22). If the result is successful, the previous point-to-point connection is reset to the point-to-multipoint connection (S23) and the point-to-point connection is restored (S24).

Then, the call setup or party addition request message is transmitted for the added leaf party processing (S25), the leaf party addition processing is performed (S26), and the party adds a connection waiting state (S27). At this time, if a call connection notification or party addition completion notification is received from the related leaf party (S28), a cell header conversion table is set according to the branch addition (S29) and the point-to-multipoint call / connection is in a busy state (S30). ).

If the point-to-multipoint connection fails, the process identifier transfer function transitions to the point-to-point call processing process (S31) and returns to the state of the point-to-point call / connection call (S32).

If the connection established on the request of party addition is a two-way point-to-point connection, the current two-way point-to-multipoint connection processing is not allowed, so the received message is ignored (S33) and the point-to-point call / connection call is again performed to guarantee the service up to at least the previous state. It becomes the state (S34).

When a call recovery message is received in a state of a point-to-point call / connection call (S35), a point-to-point call / connection recovery process is performed (S36) and a call recovery message is notified to recover the other party (S37). It enters the waiting state (S38) and receives a call recovery completion notification from the other party (S39) is a dormant state.

When the party addition request is received from the root party in the point-to-multipoint call / connection call state of FIG. 4, the process adds a new party (S40).

When a call recovery message is received from a root party in a point-to-multipoint call / connection call state (S41), a point-to-multipoint call / connection recovery process is performed (S42), and a call recovery message is transmitted to related leaf parties (S43). ) A point-to-multipoint call / connection recovery wait state is established (S44), and when a call recovery completion notification is received from related leaf parties (S45), the state is idle.

In addition, upon receiving a request for removal of a party or a party from a specific leaf party (S46), the branch connection is deleted (S47), and a call recovery completion or party deletion completion message is notified (S48). If the number of remaining parties is more than one, the point-to-multipoint call / connection remains the same as before, and if two, the point-to-point connection setting processing is performed (S50) and the previous point-to-multipoint connection is reset to the point-to-point connection. (S51) The point-to-multipoint connection is restored (S52) and a point-to-point call processing process using the process identifier inheritance function is generated (S53) and the point-to-point call / connection is in a busy state again.

The present invention requires an efficient control method of various call / connection control to provide a Broadband Integrated Service Digital Network (B-ISDN) service. In the present invention, a new process can be continuously provided without the need to release and reconfigure a preset call when switching to a new type of service during a service by using a process identifier inheritance function during a call. In addition, it is economical because limited cell replication resources in the system can be allocated only to a point where three or more parties are included in the point-to-multipoint call / connection control to meet the service needs of more users at the same time. With the emergence of new services in the future, the effects of flexible processing between services will be further increased.

Claims (4)

A first step of performing processing up to a point-to-point call / connected busy state or a point-to-multipoint call / connected busy state according to a user's request; A second step of performing party addition or call recovery request reception processing in a point-to-point call / connection busy state; A method for controlling various call / connections using a process identifier succession function in an ATM switching system comprising a third step of performing party addition, party deletion, or call recovery request reception processing in a point-to-multipoint call / connection call state. The method of claim 1, In the first step, when a call setup request is received from a user in an idle state, the user plane connection shape value of an information element indicating a broadband bearer capability (BBC) included in a call setup message, and an endpoint reference. A first step of determining a process type that should be driven for call processing by analyzing presence or absence of ER (End Reference Reference) information, number of called party numbers, and service profile information registered in the system; If the BBC information element represents the point-to-multipoint connection shape, the endpoint reference value is 0, and the Enbloc processing request includes multiple called party numbers, a point-to-multipoint call processing process is created to use the cell replication function. Performs point-to-multipoint call / connection setup processing, sends call setup requests to related leaf parties, and receives call connection notifications from relevant leaf parties while waiting for point-to-multipoint connection setup to route ATM cells. Setting a cell header conversion table and placing a point-to-multipoint call / connection in a busy state; Point-to-point call processing if the BBC information element is a point-to-point connection or if the BBC information element represents a point-to-multipoint connection and the value of the endpoint referrer is a sequential processing request with zero or one called party number. Create a process to perform point-to-point call / connection setup processing in one-way or two-way between point-to-point, send a call setup request to the counterparties, and receive call connection notifications from the counterpart subscribers while waiting for point-to-multipoint connection setup. A third step of setting a cell header conversion table for routing an ATM cell and placing a point-to-point call / connection in a busy state; Various call / connection control methods using a process identifier inheritance function in an ATM switching system, comprising a fourth process of determining that an unexpected message is ignored if it is invalid as a result of analyzing a call setup message information element. The method of claim 1, The second step includes a first step of checking whether to allow a point-to-multipoint service by referring to a registered service profile when receiving a party addition request from a root party in a point-to-point call / connection call state; As a result of the investigation in the first step, when the use of the point-to-multipoint service is allowed and the set call is a one-way point-to-point or point-to-multipoint, a point-to-multipoint call processing process is created using a process identifier inheritance function, A second process of performing a point-to-multipoint call / connection processing by the controller and reconstructing the point-to-multipoint connection and restoring the point-to-point connection if the result of the test is successful; Sends call setup or party add request message for additional leaf party processing, performs leaf party add processing, and receives branch call notification or party add completion notification from related leaf party while waiting to add party. (Branch) a third step of setting a cell header conversion table according to addition and entering a point-to-multipoint call / connection call state; A fourth step of transitioning to a point-to-point call processing process using a process identifier succession function and returning to a point-to-point call / connected call state if the point-to-multipoint connection fails; As a result of the investigation in the first step, if the connection established when the party add request is a two-way point-to-point connection, the current two-way point-to-multipoint connection processing is not allowed, so as to ignore the received message and at least guarantee the service up to the previous state. A fifth step of becoming a point-to-point call / connected call again; If a call recovery message is received while in a point-to-point call / connection call state, a point-to-point call / connection recovery process is performed, the call recovery message is notified to recover the other party, and the other party is waiting for point-to-point call / connection recovery. Various call / connection control methods using the process identifier succession function in the ATM switching system, characterized in that the sixth process is to be in a dormant state when receiving the call recovery completion notification from the. The method of claim 1, The third step includes a first step of linking to a process of adding a new party when receiving a party addition request from a root party in a point-to-multipoint call / connection call state; When a call recovery message is received from a root party while in a point-to-multipoint call / connection call state, a point-to-multipoint call / connection recovery process is performed and a call recovery message is sent to the leaf parties involved. A second step of receiving a call recovery completion notification from related leaf parties in a connection recovery waiting state; Receiving a call or party deletion request from a specific leaf party, deleting a corresponding branch connection, notifying a call completion or party deletion completion message, and then examining whether there are two or more remaining parties; As a result of the investigation in the third process, if the number of remaining parties is two or more, the point-to-multipoint call / connection state remains as before, and if two, the point-to-point connection establishment process is performed, and the previous point-to-multipoint connection is performed. Resetting to the point-to-point connection, the point-to-multipoint connection is recovered, and the point-to-point call processing process using the process identifier inheritance function to generate a point-to-point call / connection in the fourth process of being in a busy state again Various call / connection control methods using process identifier succession function in exchange system.

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