Abstract: A mobile communication system introducing ATM, AAL2 and IMA techniques in order to efficiently transmit high-speed information and multimedia traffic having various properties, and to increase transmission efficiency in a limited transmission link or transmission band. An ATM cell processing device for a mobile communication system comprises an ATM interface for receiving ATM cells dispersedly transmitted or distributed over a plurality of physical links and restoring the received ATM cells into one ATM cell stream; an AAL2 (ATM Adaptation Layer 2) cell processor for switching at least one AAL2 packet multiplexed within each ATM cell in the ATM cell stream according to routing information provided during call setup, multiplexing the switched AAL2 packets according to ATM connections, and creating an internal ATM cell having the same format as the received ATM cells; and an ATM switch for switching the internal ATM cell according to the routing information.

Abstract: There is provided an AAL2 processing device comprising an AAL2 synchronizer for receiving an AAL2 cell in which at least one AAL2 packet is multiplexed, and detecting a start point of each packet to synchronize the packet; an AAL2 switch for switching the synchronized packet according to routing information provided during call setup; and an AAL2 formatter for multiplexing the switched packet according to ATM connections, and generating an output AAL2 cell having the same format as the input AAL2 cell. Further, the AAL2 processing device comprises a CID changer interconnected between the AAL2 synchronizer and the AAL2 switch, for determining whether there are packets to be switched to the same ATM connection at the same time out of the packets to be switched by the AAL2 switch by using the cell routing information, and changing, when there are such packets, the CIDs of the packets so that the CIDs of the packets are not identical to each other.

Abstract: An ATM switching device and method for providing voice call service. In the ATM switching device, input time switch modules are connected to an input PSTN interface to switch channel data received over sub-highways to voice stream data grouped in accordance with destinations by sorting the received channel data according to time slots corresponding to numbers of destination time switch modules. Input cell assembly and disassembly modules are connected to the input time switch modules to assemble a group of voice data headed for the same destination into an identical ATM cell. An ATM switch is connected to the input cell assembly and disassembly modules and to an ATM interface to self-route the ATM cell, to switch the ATM cell, and to output the switched ATM cell to a corresponding destination. Destination cell assembly and disassembly modules disassemble the ATM cell received from the ATM switch into voice stream data.

Abstract: The device and method for multiplexing cells inputted to an asynchronous transmission mode using an input buffer according to the amount of traffic. The cell multiplexing device of an asynchronous transmission mode, includes: a buffer portion which include cell buffers corresponding to input ports, for storing cells received through the input ports; counters which have the number corresponding to that of the buffers, for storing the number of cells to be stored in the buffers a unit clock unit for determining for the counters a count unit of cells to be stored in the buffers; selector for outputting control signals to select buffers having their maximum values by comparing the values of the counters with each other; and a unit for inputting the output of the buffer unit and multiplexing the input cells according to the control signal, wherein the generation of buffer overflow is prevented by primarily processing the cells from a buffer where the most cells are stored.

Abstract: An ATM switching system has a subscriber input module, a trunk input module, an ATM switch, a subscriber output module, and a trunk output module. The subscriber input module includes: a 2B+D frame handler for splitting 2B+D channel data output from an N-ISDN subscriber into B-channel data and D-channel data, and multiplexing the split B- and D-channel data to corresponding highways; a first time switch module for sorting the channel data on the respective highways by time slots corresponding to destination time switch module numbers, and switching channel stream data grouped by destinations to the respective highways; and a first input CLAD for collecting voice data output from the time switch module by destinations to assemble an ATM cell.

Abstract: A congestion notifying device, which is provided in communication circuits subjected to congestion in an asynchronous transfer mode (ATM) network, comprises: a congestion indication signal generator for generating a congestion indication signal when congestion occurs within any one of the communication devices; an explicit forward congestion indication (EFCI) bit set position detector for generating set position information to detect a prescribed bit set position of each incoming ATM cell in response to a cell synchronization signal and a cell clock signal; and an explicit forward congestion indication (EFCI) bit set control unit for responding to the congestion indication signal and the set position information to set, on the prescribed bit set position of each incoming ATM cell, an explicit forward congestion indication bit for notifying of occurrence of the congestion in any one of the communication devices.

Abstract: A switch network and method of an asynchronous transfer mode switch network, includes an input buffer; an input switch network performing fetch and add function; a copy switch network performing fetch and add function; a feedback switch network receiving cells fedback and maintaining them until the next cell cycle; a routing table for storing data for translation and replacement of data for the cells' routing; a routing/feedback controller routing-controlling the input cells and fedback cells with reference to the routing table; routing switch networks switching-outputting the cells input; a cell splitter splitting the cells routing-output into the number of the routing networks and transferring them to the routing switch networks, and a cell merger merging and outputting the cells split and output from the output ports of the routing switch networks

Abstract: A circuit for calculating the number of idle virtual path identifiers and virtual channel identifiers which includes a counting unit for counting clock cycles indicating the number of idle virtual path identifiers and virtual channel identifiers, and clock cycles indicating the number of busy virtual path identifiers and virtual channel identifiers; and an operating unit for calculating the number of idle virtual path identifiers and virtual channel identifiers from the number of idle virtual path identifiers and virtual channel identifiers, and the number of busy virtual path identifiers and virtual channel identifiers, which were generated by the counting unit.

Abstract: The device and method for multiplexing cells inputted to an asynchronous transmission mode using an input buffer according to the amount of traffic. The cell multiplexing device of an asynchronous transmission mode, includes: a buffer portion which include cell buffers corresponding to input ports, for storing cells received through the input ports; counters which have the number corresponding to that of the buffers, for storing the number of cells to be stored in the buffers; a unit clock unit for determining for the counters a count unit of cells to be stored in the buffers; a selector for outputting control signals to select buffers having their maximum values by comparing the values of the counters with each other, and a unit for inputting the output of the buffer unit and multiplexing the input cells according to the control signal, wherein the generation of buffer overflow is prevented by primarily processing the cells from a buffer where the most cells are stored.

Abstract: An ATM switch device of the present invention is designed to construct the switch network with a large capacity in which unit switches are modulized in a certain scale and installed in a three-dimensional structure. ATM switch device constructed from Banyan network using unit switches. Unit switches placed at the front part of said switching device are partitioned by the front-end unit switches. Unit switches at the rear part of said switching device are partitioned by the rear-end unit switches. The front-end unit switches with same distance are arranged horizontally. The rear-end unit switches with same distance are arranged vertically. Then, the output ports of said horizontally-arranged front-end unit switches are orthogonally (in order) connected to input ports of vertically-arranged rear-end unit switches at the rear-end.

Abstract: Input port numbers are assigned so as to allow formation of a unit switch having a given scale of module characteristic for a 3-dimensional installation of a switching network in an asynchronous transfer mode on basis of the Banyan network. A multiplicity of unit switches of a small (n.times.n) scale, positioned in a front portion of the switching network, are partitioned in front unit switches. A multiplicity of unit switches of the same small (n.times.n) scale, positioned in a rear portion of the switching network, are partitioned in rear unit switches. Output ports of the front unit switches are coupled in sequence in a crossed manner to input ports of the rear unit switches. Further, the input port numbers of said front unit switches are reassigned in accordance with a given formula, and the output port numbers of said rear unit switches are assigned in sequence from the uppermost position to the lowermost position.