KR100600947B1 - A method to remove unreleased resource allocation in restarting Access Switching Subsystem in TDX-100 Electronic Switching System - Google Patents

Abstract

The present invention stores the minimum information on the call via the internal network subsystem (INS) in the internal network processor (INP) connected to all matching subsystems (ASS) in the electronic exchange to perform a space switching function. Of TDX-100, a method of eliminating the recovery of TAS when restarting the matching subsystem (TDX-100), which allows the recovery of resources using the information stored in the INS. By eliminating the resource recovery that may occur when the ASS restart of the electronic exchange, the utilization of expensive exchange resources is maximized, and the accuracy of operational management information such as statistical data is improved.

Description

A method to remove unreleased resource allocation in restarting Access Switching Subsystem in TDX-100 Electronic Switching System}

1 is a block diagram schematically showing the structure of a typical time division electron exchanger.

2 is a view illustrating a process in which a method of removing a recovery phenomenon is applied upon restarting a matching subsystem (ASS) in a time division electronic exchange (TDX-100) according to the present invention.

Figure 3 is a flow chart illustrating a process of recovery recovery upon restarting the ASS according to the present invention.

<Description of Symbols for Major Parts of Drawings>

50: calling party 51: calling party matching subsystem

52: internal connection network subsystem 53: called party matching subsystem

54: incoming subscriber

The present invention relates to a method for eliminating a recovery phenomenon upon restarting a matching subsystem (ASS) in a time division electronic exchange (TDX-100), and more particularly, to all matching subsystems in an electronic exchange (Access Switch Subsystem: ASS). To store minimal information about the call via the Interconnection Network Subsystem (hereinafter referred to as INS) in an Interconnection Network Processor (hereinafter referred to as INP) that performs a spatial switching function. Then, the present invention relates to a method for restoring resources by using information stored in the INS upon restart of a specific ASS.

In general, the TDX-100 electronic exchange is a switch of a distributed processing structure composed of a plurality of ASSs that receive subscribers and relay lines and perform call processing centering on the INS having a space switch function. The structure will be described with reference to FIG. 1;

An INS (2) connected to the ASS (1) to perform a station number translation and a called number translation on a digit transmitted from a main processor (not shown) to establish a path for connection with a called subscriber;

A central control system (hereinafter referred to as CCS) 3 for controlling the operation of the INS 2 is provided.

For reference, the ASS (1) includes a subscriber and trunk line interface, a time switch link, various signaling devices, a packet handler, a test device, and the like, and can be increased in units of ASS if necessary. It has a horizontally distributed structure.

The connection to the INS consists of cross duplex over 155M optical links and consists of a public switched telephone network (PSTN) subscriber interface, an Integrated Services Digital Network (ISDN) digital subscriber interface, a No.7 signaling device, a frame relay processor, a packet processor function, and an optical subscriber device. (IDLC / V5.2) Accepts interfaces and performs various exchange functions.

In addition, the INS (2) is located at the center of the system to perform the function of connecting the ASS (1) with each other or between the ASS (1) and the CCS (3), the switch network (T) -TST- (T) With a switch structure, the space switch S is located in the INS 2 and the DLC and time switch T are configured in the ASS 1. Among the call processing functions, it performs number translation, route control function, centralized functions such as space switch connection, etc., and has a network synchronizer to generate and distribute the system clock.

In addition, the CCS (3) is a subsystem that performs the overall operation and maintenance (M & A) function of the system, as well as the system-level maintenance, testing and measurement, billing, statistical functions, as well as removable DKU (RDKU), digital Storage control management of digital tape (DAT), cartridge tape (CT), magnetic tape (MT), hard disk, etc., control of various input and output statements from the operator and TMN through PMI console Interwork with.

And the ASS (1) is mounted to each of the load box 111 for generating a call, the ASP (11) for performing the call processing function and its own operation and maintenance function;

A telephony processor (hereinafter referred to as TP) 12 which is a processor that performs control and sensing functions of peripheral devices requiring real time processing;

As physical devices, subscriber matching devices (PSTN subscriber matching device, ISDN subscriber matching device, optical subscriber matching device) and other devices (ring generator, tone generator, announcement broadcasting device, packet processor, No.7 processor, IPC processing device) Devices 13 which are modules of apparatuses having the same function.

For reference, the TP 12 performs lower-level work requiring real-time processing of signals such as sensing and instantaneous analysis from lower devices. When the state of devices changes, such as when a subscriber attempts to make a call. Detect and process the subscriber state change and report it to ASP (11) (MP).

The INS 2 includes an INP 21 which is substantially responsible for internal network connection processing at the INS 2;

A TP 22 which is a processor that performs control and sensing functions of peripheral devices requiring real time processing;

A block (NES) responsible for control and operation functions of the network synchronizer device, a function block (SPCI) for transmitting control messages between functional blocks distributed in a TDX-100 switch adopting a distributed processing structure, and a distributed processing structure In the TDX-100 switch adopting the above, a device 23 which is a module of functional blocks (SSLs) for transferring control messages between respective functional blocks distributed is provided.

For reference, the TP 22 performs lower level work requiring real time processing of signals such as sensing and instantaneous analysis from lower devices, such as a storage unit 32 and an input / output port 34. The state change and the state change of the space switch device are detected and reported to INP 21 (MP).

The CCS 3 includes a central control processor (CCP) 31 for performing overall operation and maintenance (M & A) functions of the system;

A storage unit 32 for storing billing, programs and various data;

An alarm port 33 for registering an external alarm display device;

An input / output port 34 for matching an operating terminal and a printer;

An Ethernet port (Person Ether Interface) 35 for operation terminal matching;

An Ethernet and X.25 interface processor (EXIP) 36;

X.25 (37);

Ethernet 38 is provided.

A call processing path and an operation process for processing a call generated by installing a load box in the all-electric exchanger configured as described above will be described.

The load box is built in each of the 24 ASPs 11 distributed outside the INP 21 and operates in the same manner as when each subscriber attempts an actual call. In (2), a part of the load corresponding to the maximum call processing capacity of the electro-electric exchanger is added to each part.

In this case, the load box refers to virtual call generation programs implemented by replacing normal call processing programs in the 24 ASPs.

At this time, the call types generated in each load box include a PSTN including both a local call and a relay call, an integrated information communication network call (ISDN) including both a local call and a relay call, a group internal signal (DID) and a group of CENTREX. Outgoing signals (DODs) and these calls can occur simultaneously at any rate.

As such, the virtual call generation message generated in the load box mounted in each ASP 11 is transmitted through a time switch link (TSL) and an optical link through a message switch control interworking unit (MSCIU) 14 in the ASS (1). The data is transmitted to the super performance control interworking unit (hereinafter referred to as SPCIU) 4 of the INS 2.

The SPCIU 4 of the INS 2 then delivers the message to the main processor (or INP 21) or the packet handling module (not shown) (PHM) according to the destination of each message.

Upon receiving the call origination message, the INP 21 interacts with the loadbox according to the requested call type to process the call and terminate normally.

In the time division electronic exchange performing the above operation, when one or some of the ASSs fail, it may be necessary to restart the corresponding ASS to recover the failure according to the degree of the failure.

If a call via ASS is in progress (e.g., a call originated by a subscriber who is accepted by ASS # 0 and is in progress on a relay line that is accepted by ASS # 1), all calls in ASS # 0 are terminated with an initialization upon restart of ASS # 0.

At this time, in ASS # 1, all resources (relay line channel, T-SW channel, DLC channel, etc.) related to the ongoing call connected to ASS # 0 must be released to recover normal resources, but it can not be released at present and remains in a recovery state This has the disadvantage of causing operational problems such as waste of resources and inaccurate statistical data.

In view of the conventional problems described above, the present invention maximizes the utilization rate of the exchange, which is an expensive resource, by avoiding the recovery of resources that may occur during the ASS restart of the TDX-100 electronic exchange. The purpose is to increase the accuracy of operation management information such as the above.

In the time division electronic switch (TDX-100) of the present invention for achieving the above object, the method of removing the recovery phenomenon upon restarting the matching sub system (ASS) includes an originating side matching sub system (ASS) and an internal connection network sub system (INS). And (c) transmitting the call setup information from the originating processor to which the call originated from the originating processor when the call is connected to the called party through the called party ASS;

A second step of storing, in the INS processor, ASS call setting information transmitted from the calling processor through the INS;

A third step of calculating a highway number connected to the ASS by using an ASS processor number to which an ASS restart notification signal is received by an INS processor during communication;

A fourth step of checking whether the entire channel provided in the calculated highway is in use;

A fifth step of releasing a channel being used as a result of the test and calculating an ASS number connected to the channel using an output height number of an input channel;

A sixth step of transmitting a call release signal to an ASS processor corresponding to the calculated number;

And a seventh process of performing a call release procedure in the corresponding ASS processor receiving the call release signal and restoring resources by using call setup information stored in the INS.

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

FIG. 2 is a view illustrating a process in which a recovery recovery method is applied when restarting a matching subsystem (ASS) in a time division electronic exchange (TDX-100) according to the present invention. When connected to the receiving side ASS (53) through the INS 52 to establish a call with the destination subscriber 54, the following operation is performed.

The TDX-100 exchange builds up to 96,000 individual call information databases within the INP using the signals involved in the call setup for normal setup and teardown of the call via the INS. Process ID of ASS, highway number of incoming ASS, whether bi-directional or unidirectional, current channel status, etc.)

After the normal call release, the originating process releases the resources of the originating ASS and requests the release of the resources of the INP and the called ASS.

However, in the case of abnormal termination (such as the case of restarting the calling party ASS described above), since the connection relationship between the calling ASS, the INP, and the called ASS disappears, the resource is not released normally.

In order to remove resource recovery such as switch channel and process that may occur when the TDX-100 electronic exchange restarts ASS, the called processor and process ID information are added to the call information database defined in INP, and this information is added. In order to update the information, the signal that transmits the information for establishing the existing call is included in the signal for recovering the resource recovery that may occur when the ASS is restarted, so that the call is transmitted from the originating process to the INS 52. .

In this state, the following procedure is handled to release the recovery when the ASS is restarted. This process will be described with reference to FIG. 3.

Access Switch Processor (ASP) in ASS When restarting ASS by power on / off or reset, LSC (Local Service Control) mounted in ASP is installed in ASP to control time switch connection, signaling device, broadcasting announcement broadcasting device, etc. When the ASS restart notification signal is transmitted to the INP through the S / W block controlling the service device of the service device, two highways connected to this subsystem using the ASP number to which the restart notification signal is transmitted are received. HWAY) to calculate the number (S1).

Subsequently, all the 4,096 channels of the highway calculated above are checked for use (S2), and if the test result is in use, the following procedure is performed.

First, release the channel in use and obtain the ASS number associated with this channel using the output highway number for the input channel (S3).

When the number is obtained, the call release signal is transmitted to the ASP in the corresponding ASS. The ASP, which has received the call release signal, performs a call release procedure to recover resources such as a switch channel by using call setup information stored in the INS. (S4).

As described in detail above, the present invention eliminates resource recovery that may occur during ASS restart of the TDX-100 electronic exchange, maximizing utilization of expensive exchanger resources, and improving the accuracy of operation management information such as statistical data. This has the advantage that it allows accurate and easy testing of the maximum call processing capacity in the large electron changer (TDX-100).

In addition, a preferred embodiment of the present invention is 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 following claims You will have to look.

Claims (2)

A first process of transmitting call setup information from the originating processor to which the call originates from the originating processor when the call is connected between the calling party matching subsystem (ASS), the internal connection network subsystem (INS), and the called party ASS; A second step of storing, in the INS processor, ASS call setting information transmitted from the calling processor through the INS; A third step of calculating a highway number connected to the ASS by using an ASS processor number to which an ASS restart notification signal is received by an INS processor during communication; A fourth step of checking whether the entire channel provided in the calculated highway is in use; A fifth step of releasing a channel being used as a result of the test and calculating an ASS number connected to the channel using an output highway number for an input channel; A sixth step of transmitting a call release signal to an ASS processor corresponding to the calculated number; In the time division electronic switch (TDX-100) characterized in that it comprises a seventh process of performing a call release procedure in the corresponding ASS processor receiving the call release signal, and recovers resources using the call setup information stored in the INS. How to remove the recovery from restarting the matching subsystem (ASS). The method of claim 1, In the first step, the call setup information includes, for a particular switch channel, an originating process identification number (ID), a highway number of an originating ASS, an incoming process identification number (ID), and an originating ASS of a call passing through this channel. A method for removing a recovery phenomenon upon restarting a matching subsystem (ASS) in a time division electronic switch (TDX-100), comprising: a highway number, information indicating whether bidirectional or unidirectional, and current channel state information.

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