KR100360268B1 - Exchange for imt-2000 - Google Patents

Abstract

The present invention relates to a technique for accommodating a public network matching subsystem having a plurality of limited public network matching capacities in an ATM mobile switching center to allow flexible expansion from a small capacity to a large capacity and to improve signal processing speed. This invention is connected to the ATM switch subsystem 320 via the lines 332A-332N, and is a matching function with a limited capacity public telecommunication network (PSTN) under the control of the main control unit of the ATM switch subsystem 320 which will be described later. A plurality of public network matching subsystems 310A-310N; ATM switch function, mobility control, call control, and asynchronous transmission (ATM) general control of the next generation mobile communication switch, and connected to the public network matching subsystem (310A-310N) through the internal line matching unit from small to large capacity This is accomplished by the ATM switch subsystem 320, which is capable of flexibly increasing the public network (PSTN) matching capacity.

Description

Next Generation Mobile Communication Switch {EXCHANGE FOR IMT-2000}

The present invention relates to a matching technology of a next generation mobile communication exchange of Asynchronous Transfer Mode (ATM) that supports a large capacity public network matching, and in particular, a public communication network having a plurality of limited public network matching capacity in an ATM mobile communication exchange. A next-generation mobile communication exchange that accommodates matching subsystems, allows for flexible scaling from small to large and suitable for improving signal processing speed.

Conventional mobile communication exchanges are STM-based exchanges, so that the matching between homogeneous networks is made in matching with the public communication network (PSTN), so there is no problem. However, ATM's next-generation mobile communication switch has a problem of matching between heterogeneous networks in matching with STM switched public telecommunication networks.

Therefore, in the conventional ATM switch, a method such as a circuit emulation service (Circuit Emulation) was used to solve the above problems. ATM-based next-generation mobile communication exchanges require a structure that can provide the tone, voice guidance device, and vocoder functions that were provided. An interlock was used.

1 shows a connection relationship between the asynchronous transmission system switch and the public communication network connection matching device according to the prior art, and the public communication network connection matching device 104 is connected between the asynchronous transmission system switching device 101 and the public communication network (PSTN). It can be seen that it is positioned to perform the matching function between heterogeneous networks.

FIG. 2 is a detailed block diagram of a matching device for public network connection in FIG. 1, which performs a function of satisfying electrical characteristics according to the ITU-T standard and an equalization function upon reception, and performs a phase locked loop and A T1 / E1 converter matching unit 201 for providing a reference frequency to the clock generator 204; In addition to performing frame synchronization, time slots are classified and output to the time switch 203 side, and data of each channel input from the time switch 203 is converted into a frame conforming to the T1 / E1 transmission standard and the T1 / A T1 / E1 framer 202 outputting to the E1 line matching unit 201 side; A time switch 203 which receives a synchronous clock and a system clock from the phase locked loop and clock generator 204 and performs a necessary time switching function under the control of the controller 210; A phase locked loop and a clock generator 204 for generating a system clock using a reference frequency and supplying the system clock to each system; An echo cancellation and code conversion unit (205) for performing inverse conversion with ADPCM and various source codes and removing echo (Echo) in association with the time switch (203); Extract the HDLC data from the data input in the cell form of the asynchronous transmission method (ATM) and output it to the time switch 203, and to fit the HDLC data input from the time switch 203 into the ATM cell. An asynchronous transmission cell separation / combining unit 206 for combining; An asynchronous transmission method user network matching unit 208 for connecting the asynchronous transmission method router 207 to the asynchronous transmission method in a form compliant with the ATM-UNI / NNI standard; Under the control of the controller 210, the R2 signal data necessary for matching with the public communication network PSTN is generated and output to the time switch 203, and the public communication network PSTN input through the time switch 203. A signal processing device 209 for analyzing the signal data of the signal and transmitting the same to the control unit 210; It is composed of a control unit 210 for performing various signal processing with the switch and the public communication network (PSTN) of the asynchronous transmission method, and controls various functions in the network matching device.

The T1 / E1 converter matching unit 201 is a transmission line matching part that matches the PSTN at a T1 1.544 Mbps or E1 2.048 Mbps transmission rate, and fulfills the electrical characteristics according to the ITU-T standard. It also performs an equalization function upon reception, and extracts the received clock to provide the phase locked loop and the reference frequency of the clock generator 204.

The T1 / E1 framer 202 performs frame synchronization by extracting a frame of a standard type recommended by the ITU-T, and outputs the time slots to the time switch 203 side. In addition, the T1 / E1 framer 202 converts the data of each channel input from the time switch 203 into a frame form conforming to the T1 / E1 transmission standard and outputs the data to the T1 / E1 line matching unit 201. do.

The time switch 203 receives the necessary synchronous clock (8Khz) and the system clock from the phase locked loop and the clock generator 204, and performs a necessary time switching function under the control of the controller 210.

The phase locked loop and clock generator 204 generates a system clock using a reference frequency extracted from data input through a transmission line of a public communication network (PSTN), and supplies the system clock to each system. This ensures system clock synchronization.

The echo cancellation and code conversion unit 205 performs inverse conversion with 64 Kbps PCM data and ADPCM used in the IMT-2000 network and various source codes in association with the time switch 203. In this case, the control unit 210 Under the control of At this time, the required clock is supplied from the phase lock loop and the clock generator 204, and performs the code conversion function and the inverse conversion function only when necessary. In addition, the echo cancellation and code conversion unit 205 is controlled by the control unit 210 to remove the echo (Echo) generated when interworking with the public communication network (PSTN) according to the network delay and processing delay during the voice call. The echo is removed and the data is output to the time switch 203 side.

The asynchronous transmission method cell separation / combining unit 206 outputs the HDLC data obtained by separating the data input in the cell form of the 53-byte asynchronous transmission method (ATM) to the time switch 203, and the time switch ( It combines the HDLC data input from the 203 to suit the cells of the asynchronous transmission (ATM).

The asynchronous transmission method user network matching unit 208 connects the asynchronous transmission method router 207, which is an IMT-2000 switch, and the asynchronous transmission method user network interface in a form compliant with ATM-UNI / NNI standard through a 155MHZ optical cable. Play a role.

The signal processing apparatus 209 generates R2 signal data necessary for matching with the public communication network PSTN under the control of the controller 210, outputs the signal to the time switch 203, and through the time switch 203. It is responsible for R2 signal processing that analyzes the signal data of the input public telecommunication network (PSTN) and transmits it to the control unit 210. The various tone generators generate tones necessary for matching with the public telecommunication network (PSTN). It carries on the corresponding channel of time slot and transmits to PSTN side.

Finally, the controller 210 performs various signal processing with the switch of the asynchronous transmission method (ATM) and the public communication network (PSTN), and controls various functions in the network matching device or performs maintenance and repair functions.

Next-generation mobile communication switch of asynchronous transmission method requires structure that can flexibly increase public communication network matching capacity from small capacity to large capacity according to operator's network configuration, but in mobile communication exchange system according to the prior art, public communication network Due to the capacity limitation of the time switch in the connection matching device, it was difficult to increase the matching capacity of the public telecommunication network. In addition, there is a defect that the processing speed is slow because the matching device for accessing the public communication network is an external device and the signal is processed by ATM-UNI / NNI.

Accordingly, an object of the present invention is to accommodate a public network matching subsystem having a large number of limited public network matching capacities in an asynchronous transmission switch, and to flexibly expand from small capacity to large capacity and improve processing speed. In order to provide a next-generation mobile communication switch adopting the inter-processor communication (IPC) method of the next-generation mobile communication switch of the asynchronous transmission method.

1 is a block diagram showing a connection relationship between an asynchronous transfer switch according to the prior art and a matching device for public network connection.

2 is a detailed block diagram of a matching device for public network connection in FIG.

Figure 3 is an exemplary block diagram of a next generation mobile communication exchange in accordance with the present invention.

4 is a detailed block diagram of the ATM switch subsystem in FIG.

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

310A-310N: Public network matching subsystem 320: ATM switch subsystem

321A, 321B: line matching unit 322: ATM switch

323: ATM cell separation / combination unit 324: control unit

3 is an exemplary block diagram of a next-generation mobile communication switch according to the present invention, as shown here, connected to the ATM switch subsystem 320 via the lines 332A-332N and the trunks 331A-331N. A plurality of public network matching subsystems 310A-310N for performing a matching function with a limited capacity public network (PSTN); ATM switch function, mobility control, call control, and asynchronous transmission (ATM) general control of the next generation mobile communication switch, and connected to the public network matching subsystem (310A-310N) through the internal line matching unit from small to large capacity It consists of an ATM switch subsystem 320 that can flexibly increase the public network (PSTN) matching capacity.

FIG. 4 is a detailed block diagram illustrating an implementation of the ATM switch subsystem 320 in FIG. 3. As shown in FIG. 4, an STM-4, STM-1, or TS-3 subscriber line is connected to an ATM switch 322. Line matching units 321A and 321B for performing a function of matching with the line); An ATM switch 322 positioned between the line matching units 321A and 321B to perform a core switch function of asynchronous transmission type next generation mobile communication; ATM cells that combine the cells input from the control unit 324 and transfer them to the ATM switch 322, or separate the cells transmitted from the ATM switch 322 to the control unit 324 and transfer them to respective parts of the control unit 324. Separating / combining portion 323; Mobility control unit 324A having position data and authentication function to ensure mobility of mobile communication user, network control unit 324B in charge of various signal processing for matching with other network elements, public network matching subsystem 310A- 310N), the control unit 324 consisting of the main control unit 324C responsible for the operation and maintenance of the system, and will be described in detail the operation of the present invention configured as described above.

In FIG. 3, each public network matching subsystem 310A-310N has the same structure as that of FIG. 2, but an internal controller 210 corresponds to the control of the main controller 324C in the ATM switch subsystem 320. The difference is that the entire public network matching subsystems 310A-310N are controlled.

The ATM switch subsystem 320 is responsible for the switch function of the asynchronous transmission method (ATM), mobility management as a mobile communication switch, and maintenance and control of the entire ATM next generation mobile communication system. When described in detail as follows.

The line matching units 321A and 321B perform a function of matching subscriber lines of STM-4, STM-1, or TS-3 class with the ATM switch 322. In addition, the ATM switch 322 is a key switch of the next generation mobile communication of the asynchronous transmission method.

The ATM cell separating / combining unit 323 combines the cells input from the control unit 324 and transfers them to the ATM switch 322, or separates and transmits the cells transmitted from the ATM switch 322 to the control unit 324. It performs a function of transferring to the control unit 324A, the network control unit 324B, and the main control unit 324C.

The control unit 324 is a mobile communication switch, a mobility control unit 324A having location data and an authentication function to ensure mobility of a mobile communication user, and a network control unit 324B in charge of various signal processing for matching with other network elements. ), A main control unit 324C that controls the public network matching subsystems 310A-310N and is in charge of operating and maintaining the system.

Meanwhile, trunks 331A through 331N in FIG. 3 are T1 / E1 trunks for matching PSTNs. Also, lines 332A-332N are lines for connecting respective public network matching subsystems 310A-310N to ATM switch subsystem 320, and lines 333A-333N include a base station controller (RNC). A line for matching other network elements.

Each of the public network matching subsystems 310A-310N is connected to the ATM switch subsystem 320 via the line matching unit 321A, and the main controller 324C of the ATM switch subsystem 320 is Through the controller 210 of the lines 332A-332N and the public network matching subsystems 310A-310N, various signal processing such as call control, operation, and maintenance are performed in an interprocessor communication (IPC) method.

As described in detail above, the present invention can increase the capacity of N times by adding N public network matching subsystems, thereby enabling the public network matching of a large capacity.

In addition, instead of using ATM-UNI / NNI as a line for connecting each public network matching subsystem to the ATM switch subsystem, the processing speed can be improved by using the IPC method inside the ATM next-generation mobile switching center. There is an effect that the matching device for public network access can be treated as a public network matching subsystem inside an ATM next-generation mobile communication switch instead of a separate network element.

Claims (3)

A plurality of lines connected to the ATM switch subsystem 320 via the lines 332A-332N and performing a matching function with a limited capacity public telecommunication network (PSTN) under the control of the main control unit of the ATM switch subsystem 320 described later. Public network matching subsystems 310A-310N; ATM switch function, mobility control, call control, and asynchronous transmission (ATM) general control of the next generation mobile communication switch, and connected to the public network matching subsystem (310A-310N) through the internal line matching unit from small to large capacity Next-generation mobile communication switch comprising an ATM switch subsystem (320) capable of flexibly increasing the public network (PSTN) matching capacity up to. The system of claim 1, wherein the ATM switch subsystem (320) comprises: line matching units (321A, 321B) for matching subscriber lines to ATM switches (322); An ATM switch 322 positioned between the line matching units 321A and 321B to perform a switch function of mobile communication; ATM cells that combine the cells input from the control unit 324 and transfer them to the ATM switch 322, or separate the cells transmitted from the ATM switch 322 to the control unit 324 and transfer them to respective parts of the control unit 324. Separating / combining portion 323; Mobility control unit 324A having position data and authentication function to ensure mobility of mobile communication user, network control unit 324B in charge of various signal processing for matching with other network elements, public network matching subsystem 310A- And a control unit 324 composed of a main control unit 324C which controls the 310N) and is responsible for the operation and maintenance of the system. 3. The next-generation mobile communication switch according to claim 2, wherein the main controller (324C) uses an internal interprocessor communication scheme (IPC) to control the controllers of the respective public network matching subsystems (310A-310N).