KR0128846B1 - B-channel reservation & cell holching method for digital subscribers - Google Patents

Abstract

Disclosed is a method for house reservation of digital B channel booking within a narrow band ISDN exchanger. The method comprises 6 steps. In the first step(301, 302), when a process block(DSSC) for house reservation of digital B channel booking is requested for service, the house reservation service of digital B channel booking is checked whether issued or not. In the second step(303 to the extent of 305), the number of houses in a member line is checked if the house reservation service is issued. In the third step(306 to the extent of 309), the house reservation is performed if the number of houses is below 4. In the fourth step(401, 402), a terminal identification value is compared to a stored value when the member request to retrieve his house. In the fifth step(403 to the extent of 405), the retrieve is rejected when the terminal identification is different as a stored value, and check the state of B channel when the terminal identification is same as a stored value. In the sixth sep(406 to the extent of 409), the house reservation is continued if the B channel is not a break period, and the house retrieve is performed if the B channel is a break period. Thereby, the house reservation service can be effectively applied to the narrow band ISDN exchanger.

Description

Digital subscriber B (B) channel reservation call reservation method in narrowband Telecommunication Network Switch

1 is a schematic diagram of a narrowband Telecommunications network switch to which the present invention is applied;

2 is a basic call processing procedure diagram of the narrow-band integrated telecommunication network switch of FIG.

3 is a digital subscriber B channel reservation call reservation request procedure according to the present invention.

4 is a flowchart of a method for processing digital subscriber B channel reservation call reservation according to the present invention.

* Explanation of symbols for main parts of the drawings

10: ASS (Access Switching Subsystem)

20: INS (Interconnection Network Subsystem)

30: Central Control Subsystem (CCS)

The present invention relates to a digital subscriber B (B) channel reservation call reservation method in a narrowband Telecommunication Switching System. In particular, in a digital environment of a distributed control system narrowband Telecommunication Switching System, a digital subscriber (ISDN) subscriber uses a B channel during a call. The present invention relates to a call-holding method in which an existing call can be reserved, a third call can be made, and a call can be resumed through a reserved channel.

Conventional call-holding service provided by narrow-band integrated telecommunications network switch does not reserve channel B when the call is requested from the user, transitions only the call to the pending state, and then waits for the user to resume the channel B. Without it, the resumption fails. Therefore, in order to continuously provide a service to a user who has requested a call hold (call resumption, call origination, call forwarding), a function of reserving a B channel is required when a call request is requested. Accordingly, the present invention, in accordance with the requirements described above, the B-band synthesis in the digital environment of the narrow-band integrated telecommunications network switch to process the call hold, and the narrowband synthesis to interwork with various services provided in the existing voice switching network (PSTN) It is an object of the present invention to provide a digital subscriber (B) channel reservation call reservation method in an information communication network switch.

In order to achieve the above object, the present invention provides a digital subscriber (B) applied to a narrowband Telecommunications Network Switch having a Central Control Subsystem (CCS), an Interconnection Network Subsystem (INS), and an Access Switching Subsystem (ASS). A channel reservation call holding method, comprising: a first step of confirming whether a digital channel B reservation call waiting service is registered when a digital channel B reservation call processing block (DSSC) receives a request for digital channel B reservation reservation; If the digital B-channel reserved call hold service is not registered in the first step, the service is not subscribed and the call returns to the busy state. If the digital B-channel reserved call hold service is not registered, it is determined whether the number of calls allocated to the multi-participant line is within 4 or less. A second step of doing; In the second step, if the number of calls allocated to the subscriber line is 4 or more, the service is notified and the call returns to the busy state. If the number is 4 or less, the ID value of the corresponding terminal is stored and the digital B channel is stored. A third step of performing a reserved call hold process; A fourth step of comparing a terminal identifier (ID) value with a stored value when a subscriber who has requested a call hold request to resume a held call; If the stored value and the terminal identifier value are different from each other in the fourth step, it is notified of a RETRIEVE REJECT while maintaining a pending state, and if the stored value and the terminal identifier value are the same, the B channel is used. A fifth step of determining whether the state is at rest; And a sixth step of notifying that the B channel is in use and continuing the call hold state if the idle state is not in the fifth step, and reconnecting the B channel and notifying a recall to the DSSC of the other subscriber control block. It is characterized by including.

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

Figure 1 shows the configuration of a narrowband integrated telecommunications network switch to which the present invention is applied. The narrowband integrated telecommunications network switch is a large city consisting of all electronic components, a large capacity (100,000 subscribers, 60,000 trunks, 1.2 million BHCA). It is an exchanger. The narrow-band integrated telecommunication network switch is mainly composed of three subsystems: a central control subsystem (CCS) 30, an interconnection network subsystem (INS) 20, and an access switching subsystem 10 (ASS). The ASS 10 is connected to the analog and digital subscriber lines and the relay line, and is in charge of time slot exchange, call processing, and ASS operation preservation by analog / digital conversion and time division at the end. ASS exists in one function but is classified as ASS-S (analog subscriber), ASS-I (digital subscriber), ASS-T (trunk) ASS-7 (trunk NO.7), ASS-P (packet) In addition, it is possible to have a combination of several forms having the above four forms.

The INS 20 is responsible for message communication between the ASS 10 or between the ASS 10 and the CCS 30 and is located at the center of the system. Up to 60 ASSs (10) can be connected by optical fiber, and they are in charge of space switch and network. CCS (30) is a subsystem that is in charge of overall operation preservation and is responsible for system operation, test and measurement, management of statistics and mass storage, control of various input / output devices, connection of data channels with other systems, etc. . An ASS subsystem 10 is an object for implementing a digital subscriber (ISDN) subscriber B channel reserved call reservation function in a narrowband Telecommunications network switch having a hardware structure as described above. A digital B channel reserved call waiting processing software block (DSSC) is mounted in the ASS subsystem 10 to interact with existing basic call service blocks to provide digital B channel reserved call waiting service.

First, the basic procedure of basic call processing in a narrowband integrated information communication network switch having the above configuration will be described, and the present invention will be described later. The software blocks required for narrowband integrated telecommunication network exchanges to handle digital basic calls are DCC (Digital Circuit Contral), UPC (User Part Control), and NTR (Number Translation). The NTR is mounted on the INS subsystem 20 and the remaining blocks are mounted on the ASS subsystem 10. When various request and response messages stored from the digital subscriber are transferred to the DCC block, the DCC block examines each message and processes the message according to the message content (request).

The basic call processing is based on the Enbloc method (see CCITT Recommendation Q.931). When the DCC block receives the setup message from the calling subscriber, it checks whether the requested call is a speech, obtains the called number, and sends a station code translation request (PfxTransRQ) to the NTR block. Receive. The outgoing DCC block then makes a call number translation request (CdNOTransRQ) to the NTR block, and the NTR makes a call occupancy request (DigCdSubsSzRQ) to the incoming DCC block. The incoming DCC block then sends outgoing information request (DigCgInfoRP) to the outgoing DCC block, the outgoing DCC block connects the voice switch (time switch, space switch), and sends the attribute value of the telephone call to the incoming DCC block (DigCgInfoRP). The incoming DCC block notified of the originating information sends a SETUP message to the incoming digital subscriber to notify the incoming call. Then, the incoming DCC block receives the call (ALERT) and response (CONNECT) message from the incoming digital subscriber and transmits to the calling DCC block (Altertngcc, DigCdSubsAnsRP) to enter the call state. In the call state, the call release can be released by any of the originating and receiving digital subscribers first, and the DCC block received from the subscriber to release the notification is notified to the counterpart DCC block (DigCgInfoRP, DigCdRelRP) to complete the call release.

The above basic call handling method belongs to the third layer when applied to the Open System Interconnection seven-layer model, and the small amount of three-layer DSSC blur and DCC blocks are modified without modifying entities below the second layer (hardware and software). In addition, the digital wait call rejection processing method can be realized.

The digital subscriber B channel reserved call reservation service according to the present invention targets a basic rate interface (2B + D), and provides one digital reserved call per B channel and a protocol applied to the subscriber-network interface. Functional (see Functional: CCITT Recommendation Q.932) assumes a protocol.

The process required to implement digital subscriber B channel reserved call reservation service can be classified into digital B channel reserved call reservation service request, service justification review, and service processing. FIG. 3 shows a procedure for requesting a digital B-channel reserved call park service according to the present invention. When a DCC block receives a HALD message from a subscriber who is currently busy (301), the digital B-channel reserved call park service block is a DSSC block which is a digital B channel reserved call park processing block. Request for service processing and wait for your process to die. The DSSC block receiving the digital B channel reserved call reservation service first checks the contents of the database and checks whether the digital subscriber B channel reserved call pending service is registered (302), and if not registered, notifies the non-subscription of the service (303). If the user is registered, the number of calls allocated to the subscriber line is within the range of 4 or less (per B channel: 1 basic call, 1 pending call). It is determined whether there is an overload (305). If the number of calls assigned to the corresponding subscriber line is 4 or more, the service is notified (306) and the call returns to the busy state (307). If the number of calls assigned to the subscriber line is 4 or less, call waiting user check is started. In order to store the identifier (ID) value of the corresponding terminal (308), and to create a child process in the digital subscriber B channel reserved call park processing block to handle digital B channel reserved call park processing (309).

If the digital B-channel reserved call waiting service request is legally advanced, the DSSC block requests a transition to the supplementary service processing block with the control blocks (DCC, UPC) and checks the transition to the supplementary service processing block. Wait for it When receiving the confirmation notification from the counterpart DSSC block, the corresponding B channel is released, and the B channel reserved call pending request subscriber is notified of the confirmation of the B channel reserved call pending (HOLD ACK), and the counterpart subscriber's side DSSC block receives the holding tone. To inform the B channel reservation call pending.

Figure 4 shows the overall procedure of the digital subscriber B channel reserved call hold processing method according to the present invention, when the pressurizer who requested the call hold wants to re-call a held call. When requesting RETRIEVE (401), the DSSC block compares the terminal identifier value (402), and if the stored value is different from the terminal identifier (ID) value, the call is kept on hold (404). Notify the RETRIEVE REJECT (403). On the other hand, if the stored value and the terminal identifier (ID) value is the same, it is determined whether the B channel is in a dormant state (405), and if it is not in the dormant state, it is notified that the B channel is in use (406). If so, it reconnects the B-channel, notifies the calling party of the re-call to the DSSC, and requests a transition to the basic call processing block. When the control stream receives the confirmation notification, it notifies the resumption confirmation (RETRIEVE, ACK), and transfers the control to the basic call DCC to complete the resumption (408, 409).

On the other hand, if there is a channel reservation pending call, if the outgoing call is called with the same ID value, the call is processed. If the ID value is different, the call is released. If a connection notification with the same ID value is received, the connection confirmation is performed. If the ID value is not the same, the connection confirmation is performed. In the analog environment (PSTN) in the narrowband Telecommunication Network Switch, the blocks to be interlocked with the digital B channel reserved call block are ASC, TKC, and TPC. In keeping with the existing voice switching network, the Digital B-Channel Reserved Call Block (DSSC) takes charge of message conversion between the voice switching network and the integrated telecommunication network. Can be achieved.

As described above, the present invention improves the diversification of the narrowband integrated telecommunications network switch service by responding to the narrowband integrated telecommunication network switch, and maintains the modularity of the software system by realizing it as an independent block (DSSC). It is easy to apply (transfer) digital B-channel reserved call reservation service to other narrowband integrated telecommunication network switch, and call processing function is independent among other blocks. In order to interwork with the existing voice switching network (PSDN), the digital B-channel reserved call block (DSSC) is processed without modifying the existing voice switching network in accordance with the step of networkization. Smooth linkage with is achieved.

Claims (1)

Digital subscriber B channel reservation call reservation method applied to a narrowband integrated telecommunication network switch having a Central Control Subsystem (CCS) 30, an Interconnection Network Subsystem (INS) 20, and an Access Switching Subsystem (ASS) 10. A first step (301, 302) of checking whether a digital channel B reserved call reservation service is registered when the digital channel B reserved call reservation service block (DSSC) receives a digital channel B reserved call request service request; In the first step, if the digital B-channel reserved call hold service is not registered, the service is not subscribed and the call returns to the busy state. If the digital B-channel reserved call hold service is not registered, it is determined whether the number of calls allocated to the subscriber line is within 4 or less. Second steps 303 to 305; In the second step, if the number of calls allocated to the subscriber line is 4 or more, the service is notified and the call is returned. If the number is 4 or less, the ID value of the corresponding terminal is stored and the digital B channel is stored. A third step (306 to 309) for performing reservation call reservation processing; A fourth step (401, 402) of comparing a terminal identifier (ID) value with a stored value when the subscriber who has requested the call request requests to resume a held call (RETRIEVE); If the stored value and the terminal identifier value are different from each other in the fourth step, it is notified of a RETRIEVE REJECT while maintaining a pending state, and if the stored value and the terminal identifier value are the same, the B channel is used. A fifth step (403 to 405) for determining whether the state is idle; And a sixth step of notifying that the B channel is in use and continuing the call hold state if the idle state is not in the fifth step, and reconnecting the B channel and notifying the re-call to the DSSC. A digital subscriber B channel reservation call holding method in a narrowband Telecommunications network switch comprising: 406 to 409.