KR0147349B1 - Call processing method of output trunk of no.7 isup in isdn electronic switching system - Google Patents

Abstract

An object of the present invention is to provide six channel occupancy methods and call control procedures in a No.7 ISUP outgoing call line call service to provide a service having a 384 Kbps transmission rate in an integrated telecommunication network switch.

In the ISDN exchange, one channel has a fixed transmission rate of 64 Kbps. In order to provide a service having a transmission rate of 384 Kbps, the service must be occupied by six consecutive channels.

Accordingly, the present invention provides a matching process between the ISDN subscriber processing function generated when the ISDN subscriber requests a service having a transmission rate of 384 Kbps and the No.7 ISUP outbound line call control function, and 6 channels for providing 384 Kbps service. It is made by way of occupying.

Description

No.7 ISUP outgoing line call processing method for ISDN electronic switchboard

1 is a schematic control structure diagram of an integrated information communication network (ISDN) electronic switch,

2 is a software block diagram for controlling a circuit call in an integrated information communication network switchboard;

3 is a service processing flow diagram of an ISDN outgoing line call processing process of an integrated telecommunications network switching system according to the present invention.

4 is a channel occupation processing flow chart for providing a service according to the present invention.

The present invention relates to a call processing method of a No.7 user part (ISDN) outgoing line, which enables a service having a high data transmission rate (384 Kbps) such as an image in an integrated information communication network switchboard.

Currently, the evolution of this network from NISDN to BISDN is possible, and in BISDN, various transmission rates can be provided, but in NISDN, only a few kinds of multislot call services defined in the ITU-T Recommendation are available.

When an ISDN subscriber uses a 384 Kbps service in NISDN, the service can be achieved through inter-station signaling via common channel signaling No.7 ISUP.

In this case, the trunk line call processing function for processing the ISUP signaling system should provide a service having a 384 Kbps transmission rate.

In NISDN, since one channel provides a fixed transmission rate of 64 Kbps, a total of six channels are required to provide a service having a transmission rate of 384 Kbps.

Therefore, the present invention refers to the No.7 ISUP outgoing line having a channel occupancy procedure and call control procedure for providing high speed (384 Kbps) service in an integrated telecommunication network switch with reference to the Q.764 recommendation of ITU-T. The purpose is to provide a call processing method.

In order to achieve the above object, the present invention, the RCO (Route Control) block for managing the state of the route and line, and performs the inter-station call control function when the No.7 Integrated Information Network (ISDN) user unit is used as the inter-station signaling method A No.7 ISUP outgoing line call processing method applied to an integrated information communication network electronic switch including an UPC (ISDN User Part Control) block to process a high speed transmission service, wherein the high speed transmission rate is determined from the RCO block. When receiving the outgoing line occupancy request including the request for the required service, the channel is searched to receive the service availability and the related channel information if the service is available by calling a procedure for channel occupancy. (first step of channel search), and if a certain number of channels are returned to provide a service, an ISDN outgoing line call processing process is generated and idle (Id). le) When the second step of entering the state and the generated ISUP outgoing line call processing process notifies the outgoing occupancy notification to the subscriber processing process, detailed information about the originating subscriber is received from the subscriber processing process, and with reference to the information. The third step of constructing an initial address message (IAM) and transmitting it to the power station; and when the subscriber subscriber process is informed that a certain number of channels are connected, the outgoing call processing process connects the channel for the channel. Step 4, when receiving an address completion message (ACM) from the large station, notifies the calling party to the originating subscriber processing process, and upon receiving the response message (ANM) from the large country, connects to the calling subscriber processing process. 5th step of notifying, and sending a recovery message (REL) to the power when the calling subscriber gives a recovery notification. To the call recovery, and a sixth step of cutting to the call for the occupied channel.

In addition, the present invention considered the order of use of the channel recommended in Recommendation Q.764 of the ITU-T during the analysis procedure.

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

1 is a schematic control structure diagram of an integrated electronic communication network switchboard which is a distributed control system.

The integrated information communication network switch in the figure includes three subsystems: an access switching subsystem (ASS), an interconnection (INS), and a central control subsystem (CCS).

ASS is equipped with subscriber and trunk interface, time switch (T-switch), various signaling devices, packet handlers, etc. to perform most call processing functions and self-maintenance functions. Have

Up to 60 ASSs can be connected via the INS, and the transmission medium between them is an optical link.

The INS is located at the center of the system and performs the function of connecting between ASS, or between ASS and CCS, and the space switch of the time switch-space switch-time switch (T-S-T) structure is located here. It performs number translation, space switch connection functions among call processing functions, and functions to generate and distribute system clocks by using network synchronizers.

CCS acts as a subsystem that performs the overall maintenance function of the system.

2 is a block diagram of the main software block for controlling call processing in an integrated information communication network switchboard. The service provided by the exchange until the subscriber picks up the handset, calls the telephone number of the desired party, and hangs up the handset. It shows the main blocks related to call control among the functions.

In an integrated information communication network switchboard, a circuit call is composed of two call control function blocks, and each call control function block generates one process for each call to constitute an incoming process and an originating process.

The main functions of each block are as follows.

The Analog Subscriber Control (ASC) block controls the call processing for the Analytics subscriber, the Digital Circuit Subscriber Control (DCC) block controls the ISDN subscriber's call processing, and the NTR (Number Translation) block records the incoming subscriber's number. Perform the function of analysis.

RCO (Route Control) block manages the status of route and line, UPC (ISDN User Part Control) block is inter-station signaling method and performs inter-station call control function when No. 7 ISDN user part is used. The (ISDN User Part Interface) block performs a matching function between the UPC block and the MTP (Message Transfer Part) function.

When the R / 2Decadic signaling method is used as the signaling between stations, the TKC (Trunk Control) block and the TI (Trunk Interface) block are used.When the TUP signaling method is used, the Telephony User Part Control (TCP) block and the TPI ( It is performed in the Telephony User Part Interface block.

Other PBXC (Pribate Branch Exchange Control) blocks control the private exchange, Switch Network Control (SNC) blocks switch network control, SSW (Space Switch) blocks the space switch matching function, and Digital Subscriber Interface ) Block provides the digital subscriber matching function, LSC (Local Service Control) block provides local service control function, LSI (Local Service Interface) block provides local service matching function, and TSW (Time Switch) block time switch matching function. Do this.

For call control procedures for ISUP signaling, the UPC block consists of a main process that is driven at system startup and two sub-processes that are created each time a trunk line call is required (outgoing line call process, incoming line call process). . The UPC main process creates its own process according to the required call control procedures.

Referring to the control procedure of the general relay call through the ISUP signaling method, when the ISDN subscriber makes a call to another station through the ISUP, the originating process is generated from the DCC block, and the incoming process is generated from the UPC block to perform the call processing.

When a call request from another station is received by the ISDN destination subscriber through the inter-station signaling ISUP, the originating process is generated from the UPC block, and the incoming process is generated from the DCC block to perform call processing.

And when a call from another station is relayed to another station through ISUP, the originating / receiving process is generated from UPC block and call processing is performed.

3a and 3b are flow charts illustrating the service control procedure of ISUP outgoing line call processing in an integrated telecommunications network switch. When ISDN subscribers request a service requiring a transmission rate of 384 Kbps, a No.7 ISUP is applied. This section shows the call control procedure in ISUP outgoing call processing when a call goes to another station.

Specifically, FIG. 3a is a flowchart of a procedure of creating a child process for outgoing call in the UPC main process, and FIG. 3b shows a 384 Kbps service providing procedure of the generated outgoing call line process. Looking at the detailed processing procedure with reference to the drawings as follows.

1) Receive outgoing line occupation request from the RCO block. At this point, information indicating that the subscriber processing function requested a service requiring a transmission rate of 384 Kbps is transmitted from the RCO block to the UPC main process.

2) Calling a procedure (shown in Figure 4) for channel occupancy to provide 384 Kbps service, and requesting the channel to receive service availability and related channel information if available. Do a channel search.

3) If out of service, the out of service notification is notified to the RCO block, and the UPC main process is idle.

4) When six channels are returned for service provisioning, the UPC main process creates an ISUP outgoing line call processing process and becomes idle.

5) The generated ISUP outgoing call process process notifies outgoing occupancy to the subscriber handling process.

6) Upon receiving detailed information about the originating subscriber from the subscriber processing process, an IAM (Initial Address Message) is constructed with reference to the information, and transmitted to the large station through the UPI.

7) Upon being informed from the originating subscriber handling process that the switches have been connected to the six channels, the outgoing call processing process connects the call to the six channels.

8) When an ACM (Address Complete Message) is received from the power station, an alerting is notified to the originating subscriber processing process.

9) When an ANM (Answer Message) is received from a large country, a Connect notification is sent to the originating subscriber processing process.

10) The call state becomes a service available state with a transmission rate of 384 Kbps.

11) When the calling subscriber notifies the recovery, the REL (Release Message) is sent to the power so that the call can be recovered.

12) At this time, the call for the channel occupied to provide 384 Kbps service is disconnected.

13) Upon receiving the Release Complete Mwssage (RLC) message from the power station, the outgoing call processing process is terminated.

According to the outgoing call processing procedure described above, if an ISDN subscriber needs a service requiring a transmission rate of 384 Kbps, the service can be provided through No.7 ISUP.

4 is a diagram illustrating a procedure of occupying six consecutive channels when providing a service having a transmission rate of 384 Kbps.

The logical channel value of the trunk line accommodated in the integrated information communication network switch is 0 ~ 1023. If all the trunk line channels in the system are CEPT PCM carriers, the following channel occupancy procedure is applied. .

In fact, the system configuration may accommodate not only the CEPT method but also the T1 relay line, but the present invention will not refer to the channel occupation procedure for providing a service for the T1 relay line.

One PCM carrier has a physical value of 0 to 31, and if the system-wide receiving relay line is 1024, it will have 32 PCM carriers.

When occupying the channel suggested in the ITU-T Recommendation, channels 0 and 16 of the PCM carrier are to be used for transmitting signal information and should be considered when occupying 6 channels.

A channel occupancy method performed as a procedure will be described with reference to the drawings.

21) The following values are initialized when a procedure is executed.

-search_flag: If there is a serviceable channel, it becomes normal (TRUE). By default, it is a fault.

-search_cnt: It has a value for the number of channels when a service can be provided by examining all channels allocated to the ISUP relay line. The initial value is 0.

-search_data: Saves channel information that can provide service as much as search_cnt in array mode. The initial value is 0.

-search_trunk: Logical value of the relay line used for ISUP signaling.

-i: An index for storing channel information, the initial value of which is 0.

22) From the system DB, the values of the first located relay line and the last located relay line used for ISUP signaling are obtained. At this time, the value obtained from the DB means that the relay line value up to the first position of the relay line is used for the ISUP signaling method.

23) At this time, the value of search_trunk becomes the value of the relay line located first.

24) If the value of search_trunk is between the value of the first relay line and the last relay line of the system DB, perform the following 25). Otherwise, perform the following 34).

25) Divide search_trunk by 32 to calculate the remainder.

26) If the remainder is 1 or 7 or 13 or 20 or 27, then proceed from 27) below; otherwise, proceed from 13) below.

27) Check the status of search_trunk and if possible, start from the next 28); otherwise, start from the next 33).

28) The index i of the array for saving search_trunk is increased by one.

29) search_cnt is increased by one.

30) search_flag is a value representing normal (TRUE).

31) Save search_trunk in search_data (i).

32) The value of search_trunk is increased by one.

33) It is determined whether the control is passed to the above-described 4) to check the service availability of all the relay lines used in the ISUP signaling method.

34) After checking whether the service is available for all the relay lines used for ISUP signaling, search_flag is checked when control is over.

35) If search_flag is a value indicating a fault, the procedure ends execution and returns a FLASE value.

36) If search_flag is TRUE, check whether search_cnt is 0.

37) If 0, the procedure returns FLASE and finishes executing.

38) If it is not 0, check the status of five consecutive channel values after the channel value of search_data (search_cnt).

39) If the state is available, it returns 5 consecutive channel values and TRUE value after the channel value of search_data (search_cnt) and finishes execution.

40) If the state of the channel is not available, search_cnt is decremented by 1 and is performed from 16).

The channel occupancy method of FIG. 4 is performed when the channel search procedure is called in FIG. 3, thereby occupying six channels. This channel occupancy procedure can be used to provide services with 384 Kbps transmission rates in other ISDN exchanges.

Therefore, the present invention performed by the above processing procedure has the effect of providing a service having a transmission rate of 384 Kbps through No.7 ISUP in the inter-station signaling method in the ISDN exchange.

Claims (8)

Includes an RCO (Route Control) block that manages the status of routes and circuits, and an UPC (ISDN User Part Control) block that performs inter-station call control when the No. 7 ISDN user part is used as the inter-station signaling method. A No.7 ISUP outgoing line call processing method, which is applied to an all-electronic telecommunication network switchboard for processing a high speed transfer service, comprising: a outgoing line including a request for a service requiring a high transfer rate from the RCO block; Receiving a occupancy request, a first step of channel searching to call a procedure for occupying a channel to return availability and related channel information if service is available; A second step of creating an ISUP outgoing line call processing process and returning to an idle state when a predetermined number of channels are returned for service provision; When the outgoing call processing process notifies outgoing occupancy to the subscriber processing process, it receives detailed information about the originating subscriber from the subscriber processing process, constructs an initial address message (IAM) based on the information, and transmits it to the large station. The third step and the outgoing call processing process upon receiving notification from the originating subscriber processing process that the switch connection is made to a certain number of channels is performed by the outgoing line call processing process. Receiving a notification to the calling subscriber processing process when receiving a message, and receiving a response message (ANM) from the power, and sending a notification of recovery to the calling subscriber processing process. If you do, send a recovery message (REL) to the power to recover the call Integrated services digital network (ISDN) field lines outgoing call processing method of the No.7 ISUP former electronic exchange comprising a sixth step of cutting to the call for which had channel. 2. The No.7 ISUP outgoing line call processing method according to claim 1, wherein the transmission rate of the requested service in the first step is 384 Kbps. The No.7 ISUP outgoing line of the integrated information and communications network (ISDN) electronic switchboard according to claim 2, wherein the service is notified to the RCO block when the service is not available in the first step, and is in an idle state. Call processing method. The method of claim 2, wherein the channel occupancy performed by a procedure called for channel occupancy in the first step includes a value indicating a presence of a serviceable channel (hereinafter referred to as a first value), and A value for the number of channels in the case where it can be provided (hereinafter referred to as a second value), a channel information save value (hereinafter referred to as a third value) capable of providing service as much as the second value, and an ISUP signal A first process of initializing a logical value (hereinafter, referred to as a fourth value) of the relay line used in the scheme, and an index value (hereinafter referred to as a fifth value) for storing channel information; In this case, the second process of checking whether the service is available for all the relay lines used in the ISUP signaling method, and the value indicating the failure (FALSE) by investigating the first value is completed and the value indicating normal (TRUE) If the second value is 0 The third process, and if it is 0, the process is finished, and if it is not 0, the fourth process of examining the state of five consecutive channel values after the third or second channel value; A fifth process of returning five consecutive channel values after the third value or the second value of the channel value when the service state is serviceable, and terminating the No. of the ISDN electronic switch; .7 How to handle ISUP outgoing line calls. 5. The method of claim 4, wherein the second process comprises: a sixth process of obtaining a value of a firstly located relay line and a lastly located relay line from the system database (DB) used for the ISUP signaling method; A seventh process of calculating the remainder by dividing the fourth value by 32 when the value is between the first relay line and the last relay line of the DB; and when the remainder is 1 or 7 or 13 or 20 or 27, Investigate the status and if possible, increase the fifth value for saving the fourth value by one, increase the second value by one, and indicate that the first value is normal (TRUE); A No.7 ISUP outgoing line call processing method of an ISDN electronic switchboard, wherein the fourth value is stored and the fourth value is increased by one. 6. The method of claim 5, wherein the value obtained from the database in the sixth process is sequentially increased from 1 to the firstly located relay line value to indicate that the lastly located relay line value is a relay line used for ISUP signaling. No.7 ISUP outgoing line call processing method of ISDN electronic switchboard. 6. The No.7 ISUP outgoing line call processing method according to claim 5, wherein the second value, the third value, and the fifth value have an initial value of 0. . The method according to claim 2, wherein the number of occupied channels in the second step is six.