KR960016658B1 - Broad band service analysis method in the atm switching system - Google Patents

Abstract

(21 or 23) judging whether an AAL type is the type 1; if the sub type is voice information, determining it as a voice telephone service and waiting for the message; (27 or 30) waiting for the message in case of a video telephone service or a TV broadcasting service; if a timing request is needed, (32 or 34) determining it as a data transfer service and waiting for the message when the AAL type is not the type 1 and means the connective data transfer; and if the AAL type means the non-connective data transfer and MID field exists, (35,36) determining it as a non-connective data transfer and waiting for the message.

Description

Broadband Service Analysis Method in ATM Switching System

1 is a functional block diagram of an ATM switching system to which the present invention is applied;

2 is a process flow diagram for the broadband service analysis method of the present invention.

The present invention relates to a broadband service analysis method in an Asynchronous Transfer Mode (ATM) switching system.

In the conventional switching system, the type and type of service required by the subscriber are divided into telephone and facsimile, so that the service type of the subscriber is fixedly managed in the system, thereby eliminating the need to analyze the service when providing the service to the subscriber. Such a service control function of an ATM switching system that realizes a broadband integrated information network (B-ISDN) service should be able to provide various services. In addition, the call control process may need to be changed in the switching system according to the service type, and the charging policy for the subscriber may also be changed. That is, a call from the subscriber to the network side in the ATM switching system is transmitted in the call setup message (SETUP) of the call control signaling protocol Q.2931 messages recommended by the International Telecommunication Union (ITU-T) to realize broadband service. do. Therefore, it is necessary to determine the type of broadband service by analyzing the information elements of the call establishment message, and the type of service required by the subscriber in order to realize various services of the B-ISDN in the ATM switching system. Since the processing in the switching system varies depending on the subscriber, the subscriber transmits the characteristics of the terminal to the switching system when the service is provided, and a signal message type common to the terminals having various characteristics should be used.

Accordingly, an object of the present invention is an ATM switching system that can receive a call setup message (SETUP) from a subscriber station when the subscriber requests call setup, and can determine the broadband service type for processing according to the service type in the switching system. To provide a broadband service analysis method in.

In order to achieve the above object, the present invention, in the broadband service analysis method applied to ATM switching system, by analyzing the ATM Adaptation Layer (AAL) parameter information element in the call setup message (SETUP) from the Subscriber Signaling Interface (SSI) block A first step of determining whether the AAL type is type 1 (fixed speed service); After performing the first step, the subtype in AAL Type 1 is analyzed to determine whether the subtype is a voice band, if it is voice information, it is determined as a voice telephone service, and if the message is not received, the AAL subtype is image information. A second step of determining recognition; After performing the second step, if the subtype is a value representing image information, it is determined whether the maximum cell rate in the traffic descriptor corresponds to a video telephone value and a TV. A third step of waiting for a message if none of the values corresponds to any of the values; After performing the first step, it is not a type 1 (fixed speed service), but means a connected data transmission. If the bearer capability corresponds to a bearer class and a timing request is required, it is determined as a data delivery service and is waiting for a message. Transitioning to a message reception waiting state if it does not belong to a value; And in the first step, not a type 1 (fixed speed service), but a value indicating a connectionless data transmission, and if a MID (Multiplexing IDentifier) field exists, it is determined to be a connectionless data transmission service, and a message is received and a message is not present. And a fifth step of transitioning to a reception standby state.

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

1 is a block diagram of an ATM switching system to which the present invention is applied, which is decentralized into an independent ATM local switching subsystem (ALS) 1 and an ATM central switching subsystem (ACS) 2 Is interconnected by).

When a call request from a subscriber occurs, it is detected by a subscriber interface module (SIM) 3 in the ALS, and the subscriber signal cell is transferred to a signaling signal control module (SCM) 4 through a switch. The subscriber cell message is delivered as the signal cell is assembled and transmitted to the call control module.

Allocate the VPCI (Virtual Path Connection Identification) / VCI (Virtual Channel Identification) and bands in the Access Switching Control Module (ASCM) within the outgoing ALS (ATM Local Switching Subsystem) and determine the outgoing ALS. Set up the switch path between the incoming ALS via the ASWH (Access Switch Hardware) (6) and the Central Switch Hardware (CSWH) (7) of the ACS, and control the subscriber call by performing the incoming call processing of the subscriber in the incoming ALS. Perform

Broadband Subscriber Physical Layer (BSPL) block processing physical layer function, Broadband Subscriber ATM Layer (BSAL) block processing ATM layer function, AAL Signaling Handler (AASH) processing service common part on AAL layer (10) Block, AAL Signaling Handler (AASH) to process service common part on ALL layer (10) Block, Broadband Signaling Interface (BSI) block to perform service dependency function of AAL layer, Service Specific Coordination Function A BSSCF (Broadband SSCF) 12 block is implemented.

In addition, the layer 3 function receives a SSI (Subscriber Signaling Interface) 13 block for matching between the AAL and the Q.2931 call control layer, and a SAC that analyzes the broadband service type by receiving a SETUP message from the SSI block. Service Analysis Control (14) block, an SCC (Subscriber Call Control) block that performs subscriber call processing by sending and receiving Q.2931 signaling messages from the SSI block, the SSI block, and the CAC allocating the transmission band and channel to the subscriber. (Connection Admission Control) (16) block, NTC (Number Translation Control) block for translating subscriber numbers, SRSC (Self-Routing Switch Control) block 18 performing switch path control, common to call control It consists of a Call Processing System Library (CPSL) 19 block that controls the library.

2 is a process flow diagram for the broadband service analysis method of the present invention, which shows an algorithm for voice telephony service, video telephony service, connected data transfer service, connectionless data transfer service, and television broadcast service analysis.

First, a call setup message (SETUP) is received from the SSI block (21, 22), and the AAL parameter information element in the call setup message is analyzed to determine whether the AAL type is Type 1 (H'01 value) (23), In the case of AAL type 1, there are five subtypes. In this case, the subtype in the AAL type 1 is analyzed to determine whether the subtype is an H'01 value (voice band) (24).

The determination 24 determines that the analyzed service is a voice call and transitions to a message reception waiting state (25). As a result of the determination 24, the subtype in AAL Type 1 is not H'01, and the subtype is H '. It is determined whether the value is 05 (video) (26).

As a result of the determination 26, the information element for the user traffic descriptor is analyzed to determine whether the maximum cell rate corresponds to a video call (which may vary depending on the type of terminal) (27). The analyzed service is determined as a video call, and the state transitions to the message reception waiting state (28). As a result of the determination (26), the information element for the user traffic descriptor is analyzed to determine whether the maximum cell corresponds to this television (which may vary depending on the type of terminal) (29). If it is determined that the television broadcast service is a message, the state transitions to the message waiting state.

As a result of the determination (23), the AAL parameter information element is analyzed to determine whether the AAL type is type 3/4 (H'03 value) (31). If correct, the bearer class is connected to the broadband connection by analyzing the information element indicating the bearer capability. Type (BCOB-C (value B'00011)), and if correct (33), determine whether the timing requirement in the bearer capability information element is not required (B'10) (33). Determining that the service class C data transfer service, and transitions to the message reception waiting state (34), and if the determination result of the process (31 to 33) is negative, it transitions to the message reception waiting state as it is.

If the result of the process 31 determines whether there is a MID (Multiplexing IDentifier) field in the AAL parameter information element (35), and if it is correct, the analyzed service is determined to be a connectionless data transfer service, and the message transitions to the message reception waiting state, Transition to the reception standby state (36).

The above terms are the terms defined by the International Telecommunication Union (ITU-T) as a protocol for realizing broadband integrated information network (B-ISDN) service (Q.2931), which is a term promised between subscribers.

Accordingly, the present invention as described above provides a service required by a subscriber to realize various services of a broadband integrated information network (B-ISDN) in an ATM switching system, by analyzing information elements of a call setup message and determining the type of a broadband service. Since the processing in the switching system is different depending on the type of the subscriber, the subscriber transmits the characteristics of the terminal to the switching system when the service is provided, which has the effect of having a common signal message form among the terminals having various characteristics.

Claims (1)

A broadband service analysis method applied to an ATM switching system, comprising: analyzing an AAL parameter information element in a call setup message (SETUP) from a subscriber signaling interface (SSI) block to determine whether an AAL type is a type 1 (fixed speed service) One step (21 to 23); After performing the first steps 21 to 23, it is determined whether the subtype is a voice band by analyzing subtypes in the AAL type 1, and if it is voice information, determines that the voice type is a voice telephone service and waits to receive a message. Second steps 24 and 25 for determining whether the subtype is image information; After performing the second steps 24 and 25, if the subtype is a value representing image information, it is determined whether the maximum cell rate in the traffic descriptor corresponds to a video telephone value and a TV and is determined as a video telephone service or a TV broadcasting service. A third step (27 to 30) of receiving a message and waiting to receive a message if none of the values correspond to any value; After performing the first steps 21 to 23, it is not a type 1 (fixed speed service) but a value that means connected data delivery, and if a bearer capability corresponds to a bearer class and a timing request is required, it is determined as a data delivery service. A fourth step (32 to 34) for transitioning to a message reception waiting state if the message is waiting to be received and does not belong to any value; And in the first steps 21 to 23, if it is not a type 1 (fixed speed service) and a value for connectionless data transmission and a MID (Multiplexing IDentifier) field exists, it is determined as a connectionless data transmission service and waits for a message reception. And a fifth step (35, 36) of transitioning to a message reception waiting state if it does not exist.