KR0173206B1 - Call control method using low bandwidth first - Google Patents

Abstract

The present invention relates to a method of controlling a call using Low Bandwidth First (LBF) in a network in an asynchronous transfer mode (ATM) switching system. In order to provide a call control method that allows multiple users to use the limited resources in the switching system by first connecting services that require less bandwidth based on the bandwidth required by the user from the viewpoint of the network. Checking a currently available bandwidth information of each route upon receiving a status message; Selectively allocating a threshold bandwidth for each route to accept a service for each route; And a third step of accepting or rejecting the service by comparing whether the bandwidth required by the service is greater than or equal to the threshold bandwidth of the called route when the service request is received, thereby greatly increasing the reliability and efficiency of the network.

Description

Call Control Method Using Low Bandwidth Priority

1 is an exemplary configuration diagram of an ATM switching system to which the present invention is applied.

2 is a flowchart of a call control method using low bandwidth priority according to the present invention.

* Explanation of symbols for main parts of the drawings

1: subscriber call processor 2: subscriber matching circuit

3: trunk line call processor 4: relay line matching circuit

5: operation and maintenance processor 6: access switch network module

7: Internally connected switch network module

The present invention relates to a method for controlling a call using Low Bandwidth First (LBF) in a network in an asynchronous transfer mode (ATM) switching system using a statistical multiplexing method. .

Network congestion is a condition in which the exchange system does not satisfy the quality of service (QOS) negotiated for a preset service and cannot respond to a new connection request due to the overload of traffic overload control resources in the exchange system.

This intensive traffic jam or overload of the exchange system may be caused by a natural disaster, a domino phenomenon caused by a failure of a specific exchange station, or due to a concentrated call service request to one of the exchanges, or an unforeseen event. This occurs because traffic is concentrated.

Even if the exchange system operator can anticipate the concentration of call service requests in the relevant time zone, such as when a call is concentrated at a specific time for a particular called number, system overload or congestion may occur when there is no special action in the exchange system.

In the conventional public telecommunication network (PSTN), the call limiting method in congestion is the same bandwidth required by all calls, so the percentage based method and the percentage based method There was a way to connect services (Call Gapping).

However, conventionally, when a call service request is congested due to a specific incoming call, a large number of calls are not allocated a signaling channel or the system is overloaded by a call request exceeding the design capacity of the call admission control function. Therefore, there is no choice but to provide call service less than the design capacity of the system. If not, there was a problem that the system could eventually crash.

In addition, if such a situation is left unattended, the system congestion caused by a particular called party affects the corresponding switching system and the adjacent switching system, and thus, the entire network is significantly affected.

In order to solve the above problems, the present invention can not accommodate all the service requests from the user in the network network, so preferential services that require less bandwidth based on the bandwidth required by the user from the viewpoint of the network. Its purpose is to provide a call control method that allows multiple users to use the limited resources in a switching system.

In order to achieve the above object, the present invention provides a call control method applied to an Asynchronous Transfer Mode (ATM) switching system, and upon receiving a jam state message, checks the currently available bandwidth information of each route. The first step to do; Selectively allocating a threshold bandwidth for each route to accept a service for each route; And a third step of receiving or rejecting the service by comparing whether the bandwidth required by the service is greater than or equal to the threshold bandwidth of the corresponding destination route when the service request is received.

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

1 is an exemplary configuration diagram of an ATM switching system to which the present invention is applied.

Subscriber Call Processor (SCP) 1 is a processor that performs call processing of a general subscriber using the User Network Interface (UN) protocol, and together with a Subscriber Interface Module (SIM) 2 It performs overall traffic control such as call admission control and usage parameter control (UPC).

Trunk Call Processor (TCP) (3) is a processor that performs call processing with a network using a Network Network Interface (NNI) protocol. The trunk line call processor (TCP) is connected with a trunk interface module (TIM). It controls call connection for incoming and outgoing calls and manages all functions necessary for matching with network.

The Operation and Maintenance Processor (OMP) 5 manages a series of operations and maintenance-related functions in the system. That is, the processor performs billing processing, statistics, maintenance and operation management functions.

The Access Switch Network Module (ASNM) 6 is a non-blocking magnetic routing switch in the ASM that transmits a cell, which is an ATM basic unit, and has a concentrating function having a certain aggregation ratio according to the configuration of the system. Do this. On the other hand, the Interconnection Switch Network Module (ISNM) is a magnetic routing switch used as an internal interconnector between each ASM.

2 is a flowchart illustrating a call control method using low bandwidth priorities according to the present invention.

First, when the system receives a congestion control block from the congestion control block (21) that it is in a state of congestion or that the network connected to itself is reported to the operator through the system console (22). After that, if the system is heavy, the control is performed against the service originating from itself. If the system is heavy, the control is performed against the service routed to the corresponding switching center.

Therefore, a table is constructed by checking (23) the currently available bandwidth information of each route. Then, it is determined whether the bandwidth for accepting the service for each route is received from the operator (24).

If bandwidth is received from the operator to accept the service for each route, the input bandwidth is allocated as a threshold (25). If the bandwidth to accept the service for each route is not received from the operator, a default value previously input by the system is allocated as a threshold (26). In the general case, this default threshold is a large 64kbps voice service.

Then, in case of heavy traffic and other system congestion, the bandwidth to be accepted for each route is configured in the form of a table, and when a service request is received from a user (27), first, after checking the bandwidth required by the service ( 27) If the bandwidth required by the service is greater than or equal to the threshold bandwidth specified in the table of the called route (29), the service is continued for the call if at least (31). Reject the call and release the call with the cause message (30).

As described above, the present invention uses a Low Bandwidth First (LBF) method when call service requests are concentrated to a specific exchange due to a natural disaster, a failure of a specific exchange, or an unpredictable event. By allowing a large number of users to communicate using limited resources, it greatly increases the reliability and efficiency of the network.

Claims (3)

A call control method applied to an Asynchronous Transfer Mode (ATM) switching system, the call control method comprising: a first step of checking currently available bandwidth information of each route upon receiving a jam state message; Selectively allocating a threshold bandwidth for each route to accept a service for each route; And a third step of receiving or rejecting the service by comparing whether the bandwidth required by the service is greater than or equal to the threshold bandwidth of the corresponding incoming route when the service request is received. The method of claim 1, wherein the second step comprises: a fourth step of determining whether a bandwidth for accepting a service for each route has been received from an operator; A fifth step of allocating the input bandwidth as a threshold value when the bandwidth for accepting the service for each route is received from the operator as a result of the determination in the fourth step; And a sixth step of allocating a default value previously input by the system as a threshold when the bandwidth for accepting the service for each route is not received from the operator as a result of the determination in the fourth step. . The method as claimed in claim 1 or 2, wherein the third step includes checking a bandwidth required by the service when a service request is received from a user, and then checking whether the bandwidth required by the service is greater than or equal to the threshold bandwidth specified in the table of the called route. Comparing the seventh step; An eighth step of processing the service for the corresponding call when the comparison result of the seventh step is that the bandwidth required by the service is less than the threshold bandwidth specified in the table of the called route; And a ninth step of rejecting the reception of the service when the comparison result of the seventh step is that the bandwidth required by the service is larger than the threshold bandwidth specified in the table of the called route.