KR100425699B1 - STRUCTURE FOR MATCHING SYSTEM OF IMT-2000 NETWORK, OLD 2'nd PCS, PSTN AND ISDN NETWORK - Google Patents

Abstract

The present invention relates to the structure of the IMT-2000 network and other network matching system, and when the IWU system is designed by a structure in which the conventional vocoder and the echo canceller are connected by a separate sub highway (SHW), for 4K other network matching A total of five RACKs are required, and as the number of channels increases, more boards and cables are required to connect each rack, more difficult to manage and maintain, and software for assignment of subhighways (SHW) and DA-BUS. There is a problem that is complicated by cross content. Accordingly, the present invention integrates the vocoder function (VOC) into the AAL2 interface unit (A2I) and integrates the echo canceller function into the trunk unit (DSI) to change the structure of the IWU system. It is possible to reduce the shape required for the system, and the signal structure of the subhighway (SHW) and DA-BUS is maintained to reduce the cable and the like, thereby reducing the installation cost of the system and facilitating maintenance.

Description

STRUCTURE FOR MATCHING SYSTEM OF IMT-2000 NETWORK, OLD 2'nd PCS, PSTN AND ISDN NETWORK}

The present invention relates to a structure of a network matching system, and in particular, by changing the structure of a unit (IWU) that allows a system (MSC) that uses an ATM signal (155Mbps) as a backbone to match another network (PSTN / ISDN), It relates to the structure of IMT-2000 network and other network matching system to reduce the shape required for unit (IWU) configuration.

1 is an IWU (Inter Working) for matching a low speed (2Mbps) PSTN / ISDN network to an MSC (Main Switch Center) system using an STM-1 (155Mbps) ATM signal as a backbone in a conventional IMT-2000 network. Unit) is a block diagram showing the system configuration.

Hereinafter, the operation and operation of the IWU system for matching the IMT-2000 network and the other network (PSTN / ISDN) will be described.

First, when an ATM signal is input from the MSC system to the IWU system, the STM-1 10 processes this signal (call processing signal), and then all signals input through the STM-1 10 are ATMI (ATM Interface). 11 is input to the A5I (ATM AAL5 Interface) 12.

Next, the signal input to the A5I 12 is again processed through the Local Packet Switching (LPS) 13 and additional signals such as billing information are passed through the operation main processor (OPM) 14 according to the characteristics of each signal. The signal related to the call is input to the switching subsystem processor (SSP) 15 through the LPS 13.

Accordingly, the SSP 15 analyzes the received call signal, and if the call signal is a call control signal for connection with another network (PSTN / ISDN), the processor (DP4, 5) 19 receives the DSI ( Digital Signaling Interface (26) is controlled to make the connection ready.

That is, the traffic input after the call processing signal (header information signal) is informed in advance that it is for transmission to the other network (PSTN / ISDN).

As described above, before the traffic is delivered, various kinds of status signals are analyzed from the header information to make the corresponding block ready, and then the incoming traffic can be immediately processed.

At this time, the header information has information for controlling various operations, but in the present embodiment, since it is a call processing signal for connection with another network, traffic input after the call processing signal is transmitted through the A2I (22) through the ATMI (11). Is inputted to the PC) and processed to output the PCM signal.

Here, A1I and A2I are the standards defined by IMT-2000, and there are AAL1 to AAL5 according to their characteristics, and each of them is functionally composed of A1I to A5I.

Accordingly, the PCM signal output from the A2I 22 is output to the DSI 26 through a time switch (TSL). Before this, the PCM signal is compressed because voice information is compressed. The decompression signal is input to the 20 at 4K subhighway SHW, and the decompressed signal is output to the DSI 26 via the 4K subhighway SHW.

In other words, in the switching structure as described above, the 4K subhighway SHW is occupied by the A2I 22, and the 8K subhighway SHW is occupied by the VEC 20. A total of 12K subhighways will be occupied.

Accordingly, if the shape for 4K network matching is designed by the switching structure as described above, it can be seen that five shapes (hereinafter, referred to as a rack) are required as shown in FIG.

At this time, the ATMI (ATM Interface) 11, which has not been described in detail in the configuration of FIG. 1, serves to separate the STM-1 class signal into a signal and traffic, and the A2I (AAL2 Interface) 22 It functions to pass data and voice signal, or PCM, and the DH (Device Processor) 23 provides interworking service matching function between IMT-2000 subscriber and ISDN subscriber or packet network, and MDI (Modem Device Interface) 24 serves to provide an interworking function between the IMT-2000 subscriber and the modem / FAX subscriber.

In addition, descriptions of general components such as Subscriber Line Interface (SLI) 27, Variable Signaling Interface (VSI) 29, Signaling System No. 7 (SS7) 30, and Broadcast Singal Interface Modem (BSIM) are omitted. Let's do it.

Next, FIG. 2 is an exemplary view showing a shape designed for 4K network matching based on the structural diagram of FIG. 1, and is composed of five racks, and each rack (RACK1 to RACK5) is disposed at an upper and a lower part. A plurality of fans (FAN) for dissipating heat generated inside the rack to the outside, and consists of five shelf (SHELF) consisting of slots (Slot) to be removable for each functional board.

Among them, two time switch (TSL) boards occupy four shelves (SHELF) in the first rack (RACK1), four A2I boards occupy two shelves in the third rack (RACK3), In the 4th and 5th racks (RACK4, RACK5), the trunk board (DSI), vocoder and error canceler board (VEC) for connecting to other networks (PSTN / ISDN) occupy all five shelves, The second rack (RACK2) is provided with other functional boards.

Therefore, if the IWU system is designed according to the structure shown in Fig. 1, a total of five shapes (RACK) are required for 4K other network matching, and as the number of channels increases, for example, 60K other network matching is required. The total number of racks is 75 (4K (5 RACK) × 15 = 60K (75 RACK)), which requires a lot of boards and cables to connect each rack, and is difficult to manage and maintain. There is a problem that the software required for the assignment of the highway SHW and the DA-BUS becomes complicated with cross contents.

Therefore, the present invention was created in order to solve the above-mentioned conventional problems, and the system (IWU) for matching the system (MSC) using the ATM signal (155Mbps) as the backbone with the other network (PSTN / ISDN). The purpose of the present invention is to provide a structure of an IMT-2000 network and another network matching system that can reduce the shape required for the system (IWU) configuration by changing the structure of the network.

1 is a block diagram showing a configuration of an IWU system for matching a low speed PSTN / ISDN network to an MSC system using an STM-1 class ATM signal as a backbone in a conventional IMT-2000 network.

Figure 2 is an exemplary view showing a shape designed for matching 4K other networks based on the structural diagram of FIG.

Figure 3 is a block diagram showing the configuration of the IWU system to be able to reduce the number of shapes when designing the shape according to the present invention.

Figure 4 is an exemplary view showing a shape designed for matching 4K other networks based on the structural diagram of FIG.

** Description of symbols for the main parts of the drawing **

100: AAL2 interface 200: trunk

300: AAL1 interface unit

In order to achieve the above object, the present invention, in order to match the system (MSC) using the ATM signal (155Mbps) as the backbone with the other network (PSTN / ISDN), vocoder outputs the PCM signal output from the AAL2 interface (A2I) And a system (IWU) having a switching structure for inputting to the echo canceller (VEC) to decompress and output the decompressed signal to the trunk (DSI), wherein the AAL2 interface (A2I) is connected to the PCM. It is further configured to add a vocoder function (VOC) to directly decompress the converted output signal on its own, and to switch the decompressed PCM signal directly to the trunk (DSI) in the AAL2 interface (A2I). It is done.

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

Figure 3 is a block diagram showing the configuration of the Inter Working Unit (IWU) system to reduce the number of shapes when designing the shape according to the present invention.

That is, the present invention is a shape design is made by the structural diagram as shown in Figure 3, depending on how the structure is made to have a great influence on the shape of the system designed based on this.

Therefore, the present invention separates the function of the vocoder echo canceller (VEC) that occupies the subhighway (SHW) of the conventional 8K and integrates the pure vocoder function into the A2I block, which is input to the A2I 100 through the ATMI 11. The traffic may be decoded immediately without passing through the time switch (TSL) 25 and output to the DSI 200.

In addition, the echo canceller function EC separated from the vocoder echo canceller VEC is integrated into the DSI 200 in a dot board format to operate only for a large national incoming call.

In other words, the overall configuration of FIG. 3 does not appear to be much different from the conventional structure shown in FIG. 1, but in fact, by incorporating a vocoder function (VOC) into the A2I 200 that processes ATM signals, the time switch (TSL) Since it does not have to go through the processing speed will be improved.

Next, Table 1 compares and compares the structure of FIG. 1 and the structure of FIG. 3 according to the present invention.

Conventional structure Sub highway Structure according to the present invention Sub highway according to the present invention VEC 8K SHW Structure VOC / A2I (integrates vocoder functionality) 4K SHW A1I / A2I 4K SHW Structure DSI 4K SHW Structure Integrated DSI + EC features 4K SHW

As shown in the comparison table, when the maximum matching signal for matching the other network (PSTN / ISTN) is composed of 4K by the time switch (TSL), 12K (VEC (8K) + A separate signal matching of A2I (4K)) was required.

However, in the present invention, since no additional 12K signal matching is required by changing the network, as shown in FIG. 4, two time switches (TSLs) occupying four shelves can be reduced to one. do.

In this case, the A1I block and the A2I block do not need the A2I + VOC block 100 if the structure requires the A1I block 300 as an option structure, and if the structure requires the VOC + A2I block 100, the A1I function block 300 is There is no need.

Next, FIG. 4 is an exemplary view showing a shape designed for 4K network matching based on the structural diagram of FIG. 3. The rack is configured as two racks, and in the first rack RACK10, two conventional time switches are shown. (TSL) is reduced by one time switch (TSL), so the A2I + VOC board (or A1I board) is inserted in one of the two remaining shelves, and the other function boards (RNES, A5I) in the other shelf. , ATMI, LANI, etc.) are inserted.

This makes it possible to reduce the two racks previously required for the sixteen VEC boards.

In addition, by integrating the echo canceling function (EC) on the DSI board, the second rack (RACK20) eliminates the need for a separate space and uses other functional boards (VSI, LPS, SS7, SSP, etc.) that do not occupy much space. Unlike the conventional art, by inserting without allowing a space, the number of shapes can be further reduced as compared with the conventional art.

As described above, the structure of the IMT-2000 network and the other network matching system of the present invention is a system (IWU) that allows a system (MSC) using ATM signals as a backbone to be matched with other networks (PSTN / ISDN). In addition, by adding a vocoder function (VOC) to the AAL2 interface part and an echo canceler function to the trunk part DSI, the shape required for the system IWU can be reduced, thereby reducing the subhighway (SHW). And the signal structure of the DA-BUS is maintained to reduce the cable and the like, there is an effect of reducing the installation cost and easy maintenance of the system.

Claims (2)

In order to match the system (MSC) that uses the ATM signal as the backbone with the other network (PSTN / ISDN), the PCM signal output from the AAL2 interface (A2I) is input to the vocoder and the echo canceller (VEC) to decompress it. In the system (IWU) having a switching structure for outputting the decompressed signal to the trunk (DSI), it is possible to directly decompress the signal converted into PCM to the AAL2 interface (A2I) directly on its own. Add vocoder function (VOC), The structure of the IMT-2000 network and other network matching system, characterized in that configured to switch the decompressed PCM signal directly to the trunk (DSI) in the AAL2 interface (A2I). The structure of an IMT-2000 network and other network matching system according to claim 1, wherein the trunk unit (DSI) is configured by further adding an echo canceller function (EC).