KR100425586B1 - Apparatus for trunking service connection control in ATM switching system and method thereof - Google Patents

Abstract

The present invention relates to an ATM adaptation layer type 2 (AAL2) trunking service connection device and a method of an ATM (Asynchronos Transfer Mode) exchange system. In an ATM switching system having a media gateway, the media gateway is configured to transmit and receive an ATM cell. AAL2 trunking processing unit and a non-ATM multiplexing processing unit for multiplexing the ATM cells received from the AAL2 trunking processing unit, the AAL2 trunking processing unit, the high-speed cell processing unit for matching the cell received from the non-ATM multiplexing processing unit to the utopia level; An AAL2 processing unit converting the data received from the fast time switch unit into AAL2 traffic and assembling it into an ATM cell; A time division multiplexing (TDM) link unit for matching lines having a predetermined transmission rate; High-speed time switching unit for matching and switching the AAL2 processing unit and the TDM link unit; Performs a function to control the AAL2 trunking processing unit and includes a management control unit, which can increase the efficiency of the bandwidth of the ATM network and 64 per one media gateway module It can handle E1, so it can be used very efficiently when used in tandem switching centers.

Description

Apparatus for trunking service connection control in ATM switching system and method

The present invention relates to an asynchronous transfer mode (ATM) switch, and more particularly, to an apparatus and a connection method for connecting an AAL2 trunking service, which is a non-ATM service, in a media gateway of an asynchronous transfer mode switch.

In the existing network, when N-ISDN network is interworked, it is usually converted to AAL1 in ATM network, but there are disadvantages in bandwidth efficiency and low usability of resources for virtual path identifier / virtual link identifier (VPI / VCI).

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an AAL2 connection and signal connection device and a method for directly receiving an AAL2 trunking service in a media gateway of an ATM exchange to solve the above problems.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for executing the method on a computer.

1A is a block diagram of an ATM switching system according to the present invention.

Figure 1b is a block diagram showing the configuration of the AAL2 trunking processing unit of the media gateway module according to the present invention.

Fig. 2 is a diagram showing the internal connection setting data structure of the AAL2 trunking processing section.

3 is a diagram illustrating a flow of activation for AAL2 trunking connection control according to the present invention.

4 is a diagram illustrating a flow for establishing an AAL2 connection according to the present invention.

5 is a diagram illustrating a flow for setting up an AAL2 trunking signal connection according to the present invention.

FIG. 6 is a diagram illustrating a flow for signal connection when receiving an MTP-2 (Message Transfer Part Level 2) signal link message.

7 is a flowchart illustrating a flow of releasing a signal connection by receiving a signal disconnect message according to the present invention.

8 is a diagram illustrating a flow of receiving and releasing an AAL2 disconnect request message according to the present invention.

9 is a diagram illustrating a flow of receiving and releasing an AAL2 trunking signal release message according to the present invention.

10 is a view showing the flow for the AAL2 trunking connection test according to the present invention.

The AAL2 trunking service connection device of the ATM switching system according to the present invention for achieving the above object, in the ATM switching system having a media gateway, the media gateway, the AAL2 trunking processing unit responsible for transmitting and receiving ATM cells and the AAL2 trunking A non-ATM multiplexing processor for multiplexing the ATM cells received from the processor, the AAL2 trunking processor comprising: a high speed cell processor for matching cells received from the non-ATM multiplexing processor to a utopia level; An AAL2 processing unit converting data received from the high speed time switch unit into AAL2 traffic and assembling it into an ATM cell; a TDM link unit matching a line having a predetermined transmission rate; a high speed time switching unit matching and switching the AAL2 processing unit and the TDM link unit The control unit performs a function of controlling the AAL2 trunking processing unit and includes a management control unit.

The AAL2 trunking service connection method of the ATM switching system according to the present invention for achieving the above object, (a) receiving a setup request message for setting up the AAL2 connection to check whether the virtual path identifier and the virtual connection identifier is in use; (b) assigning an AAL2 valid identifier if not allocated and used in step (a); (c) establishing a TDM and ATM connection for the virtual path identifier and the virtual connection identifier; (d) AAL2 And transmitting a connection establishment confirmation message.

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

1A is a block diagram of an ATM switching system according to the present invention.

ATM switching system can be divided into ATM central switch unit 101, media gateway module 100, Non-ATM main process unit 103 and ATM main process unit 105, the interface is 155Mbps (STM, Synchronous Match at the speed of Transfer Mode). ATM central switch unit 101 is capable of operating independently as a minimum system component and is configured to operate based on ATM subscriber registration and performs interconnection functions with a plurality of media gateway modules 100 to provide a high-capacity system. It also works for nonblocking self-routing exchange.

The non-ATM main process unit 103 is a processor for managing and integrated control of the media gateway module 100 in charge of the non-ATM service, and the ATM main process unit 104 performs ATM subscriber call processing / relay call processing. The processor to process.

The media gateway module 100 is divided into two processing blocks. Non-ATM multiplexing processing unit 110 and AAL2 trunking processing unit 120 is divided into non-ATM multiplexing processing unit 110 receives the ATM cell transmitted from the AAL2 trunking processing unit 110 and multiplexed to the ATM central switch unit 101. To transmit the data.

Figure 1b is a block diagram showing the configuration of the AAL2 trunking processing unit of the media gateway module according to the present invention.

The AAL2 trunking processing unit 120 is largely divided into four processing units to form a modularization, thereby improving the performance of the AAL2 trunking processing board by improving the efficiency of quick transmission and reception of ATM cells and the queue, thereby making the system competitive. The high speed cell processing unit 121 transmits and receives a 200 Mbps serial cell at high speed between the non-ATM multiplexing processing unit 110 and transfers the received ATM cell back to the Utopia Level 2 with the AAL2 processing unit 125 according to the destination. The management controller 123 matches each other and performs a function of transmitting and receiving a cell.

The management control unit 123 is in charge of the entire master function of the AAL2 trunking processing unit 120 and controls the TDM link unit 129, the high speed time switch unit 127, the AAL2 processing unit 125, and the high speed cell processing unit 121. Manage. In addition, the high-speed time switch unit 127 transmits and receives signal link related data information through the processor serial interface. It transmits and receives the signal traffic data to the non-ATM main process unit 110 that performs the upper call processing in the AAL2 type / AAL5 type.

The high speed time switch unit 127 performs an input / output interface of 8 Mbps (64kbps x 32channel x 4E1) and provides a switching service by matching the TDM link unit 129 and the AAL2 processing unit 125. In addition, the non-ATM main process unit 110 is connected to the input / output link of the 2Mbps interface for signal traffic switching.

The TDM link unit 129 can match a total of eight E48s of 2.048 Mbps, and performs a line matching function and a framer function for each.

The AAL2 processing unit 125 converts the TDM data received from the high speed time switch unit 127 into AAL2 traffic for each connection characteristic, assembles them into ATM cells, and transmits the same to the high speed cell processing unit 121. In addition, the AAL2 processing unit 125 is performed as a codec function by being divided into 64kbps pulse code modulation (PCM) or 32kbps adaptive differential pulse code modulation (ADPCM). The remove function is also performed.

2 is a diagram illustrating an internal connection setting data structure of the AAL2 trunking processing unit 120.

The TDM / AAL2 connection identifier ranges from 0 to 512. The I / O Virtual Path Id / Virtual Connection Id (INPV, IN_VCI, OUT_VPI, and OUT_VCI) for ATM connections can be used without limitation. CID (Connection ID), which is an AAL2 connection identifier for VCI, is distinguished from 0 to 255. The connection type is classified into a VC (virtual connection) and a VP (virtual path). In order to express TDM information, link numbers are distinguished from 0 to 7 and timeslot numbers are distinguished from 0 to 31. It also includes echo cancellation, codec type selection and A-low and u-low selection. Finally, information on the type of traffic (for example, VBR, CBR) is inserted. This information is managed in a one-to-one mapping from TDM identifiers to VPI / VCI / CID identifiers.

3 is a diagram illustrating a flow of activation for AAL2 trunking connection control according to the present invention.

When the management control unit 123 starts, it performs interrupt initialization of the processor, initializes memory and H / W board, and initializes the TDM / ATM connection setting table in sequence with the data structure shown in FIG. 2 (Step 310). In order to set an AAL5 ATM channel related to control message transmission / reception with the multiplexing processor 110, an arbitrary VPI / VCI is allocated to set a transmission / reception channel (step 320). This channel becomes the connection establishment path, and in the case of AAL2 switched trunking, signal traffic is transferred to the call processing block performed by the non-ATM main processor unit 103 using this path.

Next, the TDM link unit 129 matching the 2.048 Mbps E1 trunk subscriber checks the hardware state and the operation state and checks the hardware state and the operation state of the fast time switch unit 127 if it is normal. The hardware state and the operation state of the 121 are inspected, and if normal, the hardware device of the AAL2 processor 125 is initialized (step 330).

After the initialization of the AAL2 processing unit 125, the AAL2 packet assembly function performed by the AAL2 processing unit 125 and the normality of the signaling protocol engine, the normal existence of the voice codec processing function performing the compression coding method of the TDM data, and each voice. Echo cancellation function checks to remove echoes when echo occurs on data, normal operation checks to detect and generate dialtone / ringback tone / busy tone / test tone for relay line and subscriber, When AAL2 is connected, the state of the silent detection function is checked in the traffic data (step 340), and if everything is normal (step 350), the AAL2 processing unit 125 stores the status field of normal operation (step 360) and performs a hardware function test. After the success notification message is transmitted to the non-ATM multiplexing processing unit 110, the management control unit 123 transitions to the activation state step (step 370) and becomes a service available state.

If at least one abnormal state is detected from the TDM link unit 129 by checking the hardware state and the operation state until the silence detection function is normal (step 350), the controller 123 displays an error state (step 380). It is stored in the parameter of the initialization failure notification message and transmitted to the Non-ATM multiplexing processing unit 110 via the high speed cell processing unit 121, and then terminates if it continues to occur even after performing three reinitializations.

4 is a diagram illustrating a flow for establishing an AAL2 connection according to the present invention.

When the AAL2 connection setup request message is received from the non-ATM multiplexing processor 110 in the activation step (step 410), the AAL2 connection setup parameters input / output VPI / VCI, connection type, traffic type, echo cancellation function, codec type, and connection identifier After storing (CID, Connection IDentity) and TDM connection information in the data structure table of FIG. 3 (step 420), it is checked whether the input / output VPI / VCI is previously allocated and used by the AAL2 processing unit 125 (step 430). .

If not used previously, refer to the data structure table and assign an unused TDM / AAL2 connection identifier (step 431), and each parameter (for example, codec type, echo cancellation function, connection type, etc.) in the AAL2 processing unit 125. After operating for the corresponding function, after performing the ATM physical layer connection (connection to the call) in the AAL2 processing unit 125 for the corresponding VPI / VCI / CID, TDM information (for example, link number, time slot) TDM / ATM connection mapping function (input / output C link, channel-> VPI / VCI / CID) to connect the interface between the data input and output from the high-speed time switch unit 127 and the data of the AAL2 processor 125. Perform. In addition, the CID coefficient is increased by 1 for the currently connected VPI / VCI (step 433).

Check if the CID is duplicated by checking whether it is being used by the high-speed time switch unit 127 with TDM information (e.g., link number and timeslot number) (step 435). After allocating the assigned TDM / AAL2 connection identifier, a time switch error is displayed and a connection establishment failure notification message is sent to the non-ATM multiplexing unit.

If the high speed time switch unit 127 checks whether it is in use and checks whether the CID is duplicated (step 435), if it is not in use, connects the corresponding 8 Mbps channel input / output port of the high speed time switch unit 127 (step 440) to switch. Provide service. At this time, the management control unit 123 transmits to the non-ATM multiplexing processing unit 110 that the AAL2 connection establishment is successful (step 450).

If the input / output VPI / VCI is previously used by the AAL2 processing unit 125 and checked (step 430), if the input / output VPI / VCI is being used, it is checked whether the CID currently set for the used VPI / VCI is previously used (step 435). ) If duplicated, CID duplicate error is displayed and connection establishment failure notification message is sent to Non-ATM multiplexing unit 110, and if CID is not duplicated, only TDM connection that maps TDM and CID to make new AAL2 connection to same ATM connection Increase the CID factor by 1 (step 437).

5 is a diagram illustrating a flow for setting up an AAL2 trunking signal connection according to the present invention.

When the AAL2 trunking signal connection setup request message is received from the non-ATM multiplexing processor 110 (step 510), the signal connection setup parameter is stored in the signaling link management table (Signalling MESSAGE TRANSFER PART LEVEL-2, MTP-2) (520). In step 530, if the number of signal links already set is 3 or more (step 530), if there are 3 or more errors (step 570), the AAL2 trunking connection establishment failure notification message is displayed in the Non-ATM multiplexing processor 110. (Step 580).

If the number of signal links is less than 3, a Signaling Message Transfer Part message (MTP) is determined based on the received parameters to determine whether to use an AAL2 packet frame or AAL5 (step 540). If used, AAL2 connection establishment for a new VPI / VCI / CID for signal link transmission is performed, and initialization for delivering AAL2 frames is performed (step 541).

In order to connect the TDM link unit 129 with the fast time switch unit 127 and the management control unit 123 with TDM information (e.g., a link number and a time slot number), the management control unit 123 is provided within the management control unit. The signal link connection is determined according to the result of connecting the hardware serial interface function (Time Slot Assigner) and the high speed time switch unit 127. If the signal link connection is successfully established, the number of signal links is increased by 1 (step 550), and the setting success is notified to the non-ATM multiplexing processor 110 (step 560). If the number of signal links is less than 3, it is determined whether the signal link message (MTP-2 message) is transmitted using AAL2 packet frame or AAL5 based on the received parameter (step 540). The message transmission / reception processing used is initialized (step 543).

6 is a diagram illustrating a flow of signal connections when an MTP-2 signal link message is received.

When the MTP-2 signal link message is received from the TDM link unit 129 (step 610), it is checked whether the information is the same as the registered signal link (for example, the link number and the timeslot number) (step 620). In this case, the MTP-2 layer protocol is executed, and the frame extracted by the protocol engine is transmitted to the AAL2 packet or the AAL5 frame (step 630). When the signal link connection is established, the corresponding signal link frame creation information is stored. You can decide. In the case of the AAL2 packet, the extraction frame is transmitted to the AAL2 processing unit 125 (step 640). In case of the AAL5 packet, the extraction frame is transmitted to the non-ATM multiplexing processing unit 110 through an IPC (Inter processor communication) message (step 650). Check whether the registered signal link message (step 620) and if the unregistered signal message is received immediately discarded.

7 is a flowchart illustrating a flow of releasing a signal connection by receiving a signal disconnection message according to the present invention.

When the signal link message is received from the non-ATM multiplexing processor 110 as an AAL2 frame or an AAL5 frame (step 710), it is checked whether the information is the same as the registered signal link (for example, the link number and the timeslot) (720). If the match is correct, the MTP-2 layer protocol is performed to transmit the AAL2 frame or the AAL5 frame to the fast time switch unit 127 by the protocol engine and transmit in the E1 trunk direction (step 730). If not a registered signal link, discard it immediately.

8 is a diagram illustrating a flow of receiving and releasing an AAL2 disconnect request message according to the present invention.

When receiving the AAL2 disconnect request message from the non-ATM multiplexing processor 110 (step 810), the AAL2 disconnection parameter is searched in the data structure table shown in FIG. 3 to confirm the existence of the VPI / VCI (820). Step) If the CID usage coefficient is greater than 1 (step 830), TDM connection deletion is performed to delete only one CID connection and to maintain the remaining ATM connection. Next, the TDM / AAL2 connection identifier is deleted from the data structure table (step 840) and a disconnection common notification message is transmitted to the non-ATM multiplexing processor 110 (step 850).

If the CID usage factor is 1, perform the TDM connection deletion of the CID, delete the ATM connection corresponding to the VPI / VCI (step 833), and then delete the TDM / AAL2 connection identifier from the data structure table (step 840). The success notification message is transmitted to the non-ATM multiplexing processor 110 (step 850).

If there is no corresponding connection (i.e., VPI / VCI / CID to TDM connection information), a search error is displayed and a connection failure notification message is transmitted to the non-ATM multiplexing processor 110.

9 is a diagram illustrating a flow of receiving and releasing an AAL2 trunking signal release message according to the present invention.

When the signal link release request message is received from the non-ATM multiplexing processor 110 (step 910), a signal link (for example, VPI / VCI, E1 number or time slot) is performed by searching in the signal link registration table with the release parameter. Check whether the number has been previously registered (step 920), and if it is registered, delete the AAL2 or AAL5 connection connected to the signaling channel for the switched trunk or non-switched trunking connection service ( In step 930, the signal disconnection common notification message is transmitted to the non-ATM multiplexing processor 110 (step 940).

If it is not registered by checking whether the signal link has been previously registered (step 920), if not, the search error is displayed and the signal disconnection failure notification message is transmitted to the non-ATM multiplexing processor 110.

10 is a view showing the flow for the AAL2 trunking connection test according to the present invention.

When the AAL2 inspection request message is received from the non-ATM multiplexing processor 110 (step 1010), the available ATM connection is examined in the data structure table of FIG. 3 (step 1020) and the VPI / VCI / CID connected to the corresponding ATM connection is checked. At the same time (step 1030), if the service is checked and assigned and the service is available (AAL2 effective ID registration), and if successful, the test success notification message is sent to the non-ATM multiplexer 110 (step 1040). If it is not the last connection, check the ATM connection again.

If the VPI / VCI / CID connected to the ATM connection is checked and not assigned, the inspection failure notification message is transmitted to the non-ATM multiplexing processor 110, and if the connection is not the last connection in the table, the ATM connection check is performed again.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage device, and also carrier waves (for example, transmission over the Internet). It also includes the implementation in the form of. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

As described above, according to the present invention, the AAL2 trunking service according to the present invention performed in the AAL2 processing board of the media gateway when the non-ATM service N-ISDN network interworking in the ATM switch, the efficiency of the bandwidth of the ATM network In addition, it can handle 64 E1 per media gateway module, so it can be used very efficiently when used in tandem switching center. In addition, the system can be integrated into a single standardized connection control message using the operation of individual interlocking modules (signal link control function, AAL2 protocol function, echo control function, and codec function), and hardware matching is performed using the same interface. When operating costs are reduced and the network of ATM switches and other networks are linked, operators and developers can send and receive a single message according to the open concept to connect the media gateway and hardware. It offers the advantage of being able to quickly start a service on another board or another module when it is not available.

Claims (16)

In an ATM switching system having a media gateway, The media gateway includes an AAL2 trunking processor for transmitting and receiving ATM cells and a Non-ATM multiplexing processor for multiplexing ATM cells received from the AAL2 trunking processor. The AAL2 trunking processing unit A high speed cell processor for matching cells received from the non-ATM multiplexer to a utopia level; An AAL2 processing unit converting data received from the fast time switch unit into AAL2 traffic and assembling it into an ATM cell; A TDM link unit that matches a line having a predetermined transmission rate; A fast time switching unit for matching and switching the AAL2 processing unit and the TDM link unit; And AAL2 trunking service connection device of the ATM switching system, characterized in that for performing the function of controlling the AAL2 trunking processing unit and comprises a management control unit. The method of claim 1, wherein the high-speed cell processing unit And receiving the 200 Mbps serial cell from the ATM multiplexing processor, matching the received ATM cell to Utopia level 2, and transmitting the received ATM cell to the AAL2 processing unit and the management control unit. The method of claim 1, wherein the AAL2 processing unit And converting the TDM data received from the high speed time switch unit into AAL2 traffic for each connection characteristic, assembling it into an ATM cell, and transmitting the same to the high speed cell processing unit. The method of claim 1, wherein the AAL2 processing unit AAL2 trunking of ATM switching system, which is divided into pulse code modulation (PCM) or adaptive differential pulse code modulation (ADPCM) as a codec function, and performs echo cancellation and silence cancellation. Service connector. The method of claim 1, wherein the TDM link unit An AAL2 trunking service connector in an ATM switching system that matches up to eight E48 transport paths at 2.048Mbps and performs line matching and framer functions for each of them. The method of claim 1, wherein the high speed time switching unit An AAL2 trunking service connection apparatus of an ATM switching system, which performs an input / output interface of 8 Mbps and provides a switching service by matching the TDM link unit and the AAL2 processor. The method of claim 1, wherein the high speed time switching unit An AAL2 trunking service connection device of an ATM switching system, which is connected to an I / O link of a processor and a 2 Mbps interface for signal traffic switching. The method of claim 1, wherein the management control unit Non-controlling the TDM link unit, the high speed time switch unit, the AAL2 processing unit and the high speed cell processing unit and receiving signal link related data information from the high speed time switch unit and performing the higher call processing in the AAL2 type or AAL5 type. AAL2 trunking service connection device of the ATM switching system, characterized in that the transfer to the ATM main processor. (a) receiving a setup request message for establishing an AAL2 connection and checking whether it is in use by allocating a virtual path identifier and a virtual connection identifier; (b) assigning an AAL2 valid identifier if it is not allocated and used in step (a); (c) establishing a TDM and ATM connection for the virtual path identifier and the virtual connection identifier; And (d) transmitting the AAL2 connection establishment confirmation message; and the AAL2 trunking service connection method of the ATM switching system. The method of claim 9, wherein in step (a), The setting request message for setting up the AAL2 connection is an ATM comprising the input / output VPI / VCI, connection type, traffic type, echo cancellation function, codec type, connection identifier (CID), and TDM connection information as an AAL2 connection setting parameter. How to connect AAL2 trunking service of switching system. The method of claim 9, wherein step (a) AAL2 trunking service connection method of the ATM switching system further comprising the step of storing the AAL2 connection establishment message. The method of claim 9, wherein step (b) If the I / O VPI / VCI is determined to be used in the past, it is checked if the CID set for the VPI / VCI being used is in use before. AAL2 trunking service connection method of an ATM switching system, characterized by sending a notification message. The method of claim 9, wherein step (b) If the I / O VPI / VCI is determined to be previously assigned and in use, if it is confirmed that the CID set for the VPI / VCI being used is not previously in use, the TDM and CID for the new AAL2 connection to the same ATM connection are used. AAL2 trunking service connection method of the ATM switching system, characterized in that to perform only TDM connection mapping. The method of claim 9, wherein step (d) If the TDM information including the link number and the timeslot number is found not to be used, the switching service is provided by connecting the corresponding I / O port of 8 Mbps and transmitting a message indicating that the AAL2 connection is successful. AAL2 trunking service connection method of ATM switching system. The method of claim 9, wherein step (d) If the TDM information including the link number and the timeslot number is found to be in use, the TDM / ATM connection is released and the TDM / AAL2 connection identifier assigned in FIG. 3 is released. And transmitting the connection establishment failure notification message after the connection of the AAL2 trunking service of the ATM switching system. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 9 to 15 on a computer.