KR100304941B1 - Processing Apparatus for Support Multi virtual channel - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to mobile communications, and in particular AAL supporting multiple virtual channels adapted to transfer AAL-2 data from multiple mobile stations to their destination via multiple virtual paths (VPs) / virtual channels (VPs). -2 relates to a processing device. The AAL-2 processing apparatus supporting the multiple virtual channels according to the present invention is characterized in that each user data transmitted from a plurality of AAL-2 users is transmitted to the same ATM cell according to the destination information and transmitted from the transmitting end and the ATM layer By demultiplexing each transmitted ATM cell and dismantling it into user-specific minicells according to the corresponding destination, the system includes a receiver that transmits to the corresponding destination, thereby increasing system efficiency and exhibiting excellent performance in terms of system expansion and operation.

Description

Processing Apparatus for Support Multi virtual channel

TECHNICAL FIELD The present invention relates to mobile communications, and in particular AAL supporting multiple virtual channels adapted to transfer AAL-2 data from multiple mobile stations to their destination via multiple virtual paths (VPs) / virtual channels (VPs). -2 relates to a processing device.

In general, a base station (BTS) or switching center (MSC) of a mobile communication system transmits packet data to a destination using a transmission method of an asynchronous transfer mode (hereinafter, referred to as ATM). ATM transmission method divides user information into a certain packet size, adds destination information to the header of the packet, generates a cell of fixed size (53 bytes), and then transfers the generated cell to the destination. .

In this ATM transmission scheme, a protocol for transmitting packet data is composed of a physical layer, an ATM layer, an AAL layer, and a higher layer. Here, the AAL layer is a layer for reassembling user application data (that is, packet data) from the upper layer into 48 bytes, and the AAL1 format to the AAL5 format are defined (see I Series Recommendation of ITU-T). At this time, the AAL2 protocol is to provide a variable rate and real-time service for packet data.

Hereinafter, the AAL2 and AAL5 protocols will be described in more detail.

When the ATM transmission method transmits user information having a low bit rate, the actual valid data fills only a portion of the ATM cell payload, and the remaining unfilled portion is padded with '0' and transmitted.

Accordingly, low bit rate voice data transmitted from a plurality of mobile stations that are serviced by the same base station in a mobile communication system employing an ATM transmission scheme are each packed and transmitted to different cells. This wastes the payload portion of the cell and also introduces a delay in which packet data transmitted from another mobile station cannot be transmitted while short length packet data is packed into one cell and transmitted.

To solve this problem, the AAL2 protocol is recommended.

In other words, the AAL2 protocol multiplexes or decomposes short-length packets transmitted from multiple users on an ATM network into a single ATM cell, thereby reducing the time required to pack short user data into an ATM cell, thereby reducing the bandwidth of an ATM network. Can be used efficiently.

1 is a view for explaining the AAL-2 protocol recommended by the conventional ITU-T.

Referring to FIG. 1, the AAL-2 protocol is divided into a service specific convergence sublayer (hereinafter abbreviated as SSCS) and a common sublayer (hereinafter abbreviated as CPS).

The packet data transmitted from the mobile station enters the AAL layer through a service access point (SAP) of a higher layer (not shown) in the form of a service data unit (SDU). The protocol generates a SSCS-PDU (Protocol Data U12nit) by adding a header and a trailer to the SDU in the SSCS.

Then, the CPS generates a CPS-packet by adding a CPS-head to the CPS-SDU, and generates a 48-byte CPS-PDU by adding a start field to the CPS-PDU payload. At this time, the CPS-packet becomes a payload of the CPS-PDU. Here, since the CPS-PDU is 48 bytes, CPS-packets of multiple users are multiplexed and inserted into the payload of the CPS-PDU.

Subsequently, the CPS-PDU is transmitted to the ATM layer, and the ATM layer generates an ATM cell having a total size of 53 bytes by adding a header, which is 5 bytes of destination information, to the CPS-PDU.

As such, the packet data received from each mobile station is divided into 48 bytes through the AAL-2 protocol and used as payload of the ATM cell.

FIG. 2 is a diagram showing a data structure of a CPS-packet generated in the AAL2 protocol shown in FIG. 1, and FIG. 3 is a diagram showing a data structure of a CPS-PDU generated in the AAL2 protocol shown in FIG.

2 to 3, a CPS-packet is composed of a CPS-packet head and a CPS-packet payload. At this time, the CPS-packet header includes an 8-bit channel identifier (CID) field for distinguishing a plurality of users in one virtual channel (hereinafter, abbreviated as VC), and a payload of the CPS-packet. 6-bit length indicator (LI) field indicating size, user-to-user indication (UUI) field to distinguish SSCS data, CPS user, network manager, and error of CPS-packet header It consists of a 5-bit header error control (HEC) field for correction. Here, since the channel identification field (CID) is 8 bits, one virtual channel can accommodate 256 users.

In addition, the CPS-PDU is a start field composed of an OSF (Offset field), a serial number (Sequence Number, SN), and a parity bit (P) indicating the size from the payload start point of the CPS-PDU to the start point of the next CPS-packet. And a payload and a padding field.

However, although the conventional AAL-2 protocol supports transmission using a single virtual channel when transmitting packet data to a destination, it is recommended as a standard and supports multiple virtual channels. Transmission of packet data (or cells) over virtual channels has not been recommended as a standard yet. Therefore, in a mobile communication system employing the AAL2 protocol, a plurality of mobile stations, base stations, or switching stations cannot transmit packet data to a destination through a plurality of virtual channels, thereby causing limitations in user capacity and transmission speed.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and AAL- supporting multiple virtual channels for transmitting AAL-2 data transmitted in a communication system through multiple virtual paths / virtual channels. 2 to provide a processing device.

According to an aspect of the present invention for achieving the above object, the AAL-2 processing apparatus supporting multiple virtual channels is to send each user data transmitted from a plurality of AAL-2 users to the same ATM cell according to the corresponding destination information The transmitter comprises multiplexing and transmitting terminals, and demultiplexing each ATM cell transmitted from the ATM layer into a user-specific mini cell according to a corresponding destination, and transmitting the same to a corresponding destination.

Preferably, the transmitting end includes a first buffer for storing each transmitted user data, a first controller for outputting each user data stored in the first buffer, and channel identification information (CID) for each transmitted user data. And a first memory for storing virtual path (VP) / virtual channel (VC) information, and channel identification information (CID) and virtual path (VP) / virtual channel (VC) information stored in the first memory. A second controller for outputting according to the routing information (R-TAG) of each user data, and the stored channel identification information (CID) is allocated to each of the transmitted user data according to the control of the second controller. A mini-cell assembly unit for assembling a cell, an ATM cell assembly unit for multiplexing mini-cells having the same virtual path (VP) / virtual channel (VC) information by receiving the assembled user-specific mini cells and assembling them into ATM cells; A second memory storing an ATM cell in a lip state, a third memory storing address information of an ATM cell in an unassembled state stored in the second memory, and an unassembled stored in a second memory with reference to the third memory. A third controller for outputting an ATM cell in a state; a timer generating a control signal at a predetermined time interval; and each ATM cell assembled at the ATM cell assembly unit at a predetermined cycle according to the control signal generated by the timer. And a second buffer for storing each ATM cell outputted from the fourth controller.

The receiver may further include a first buffer for storing each transmitted ATM cell, a first controller for outputting each ATM cell stored in the first buffer, and demultiplexing each transmitted ATM cell into a user-specific mini cell. A first cell for storing an undisassembled minicell, a second memory for storing address information on the uncelled minicell stored in the first memory, and the second memory A second controller for outputting an undisassembled minicell stored in the first memory with reference to channel identification information (CID) and virtual path (VP) / virtual channel (VC) information of each of the disassembled minicells. A third memory for storing routing information (R-TAG), a user data assembly unit for allocating routing information (R-TAG) stored in the third memory to each of the disassembled mini-cells, and the user data assembly unit Output from It is composed of a second buffer to store each of the mini cell.

1 is a view for explaining the AAL-2 protocol recommended by the conventional ITU-T.

FIG. 2 shows the data structure of a CPS-packet generated in the AAL2 protocol shown in FIG.

3 is a diagram showing a data structure of a CPS-PDU generated in the AAL2 protocol shown in FIG.

4 is a block diagram showing an AAL-2 processing apparatus according to the present invention.

5 is a block diagram illustrating an AAL-2 transmitter shown in FIG. 4;

FIG. 6A is a diagram for explaining an external transmission depiram shown in FIG. 5; FIG.

FIG. 6B is a diagram for explaining the internal transmission SRAM shown in FIG. 5; FIG.

FIG. 6C is a diagram for explaining the external transmission SRAM shown in FIG. 5; FIG.

FIG. 7 is a block diagram illustrating an AAL-2 receiver shown in FIG. 4; FIG.

FIG. 8A is a diagram for explaining an external receiving diaphragm shown in FIG. 7; FIG.

8B is a diagram for explaining an internal receiving SRAM shown in FIG. 7.

8C is a diagram for explaining an external receiving SRAM shown in FIG. 7.

9A shows ANP data.

9B illustrates user data.

FIG. 10 is a diagram illustrating a process in which a mini cell for each user is multiplexed in a payload of an ATM cell. FIG.

11 illustrates that ATM cells not filled by each minicell are padded with '0'.

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

500: transmit input buffer 501: transmit input buffer controller

502: external transmission defiram 503: transmission table controller

504: mini cell assembly 505: external transmission SRAM

506: internal transmission SRAM 507: VP / VC table controller

508: ATM cell assembly unit 509: transmission output buffer controller

510: transmit output buffer 511: status register

512: Timer

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

According to the present invention, an AAL provided in a base station (BTS) and a base station controller (BSC) of a mobile communication system to transmit packet data transmitted from a plurality of mobile stations to a corresponding destination through multiple virtual paths (VP) / multiple virtual channels (VC). -2 propose a processing device.

Figure 4 is a block diagram showing an AAL-2 protocol implementation apparatus according to the present invention.

Referring to FIG. 4, an AAL-2 protocol implementation according to the present invention provides an AAL-2 transmitting end 400 for multiplexing packet data received from a plurality of AAL2 users to a corresponding ATM cell according to multiple virtual paths / multiple virtual channels. And an AAL-2 receiving end 401 which receives a fixed size ATM cell from the ATM layer, demultiplexes by subscriber, and transmits the same to the AAL2 user.

The AAL-2 protocol implementation apparatus configured as described above is provided in each of a base station (BTS) and a base station controller (BSC).

Therefore, in the case of the AAL-2 protocol implementation apparatus provided in the base station (BTS), the AAL-2 user is a plurality of mobile stations, and the ATM layer is a base station controller (BSC).

FIG. 5 is a block diagram illustrating an AAL-2 transmitter shown in FIG. 4.

Referring to FIG. 5, the AAL-2 transmitting end includes a transmission input buffer 500 for storing AAL-2 user data transmitted from a plurality of AAL2 users, and a transmission input for reading user data stored in the transmission input buffer 500. A buffer controller 501 and a channel storing channel identifier information (CID) and virtual path / virtual channel information according to routing information (Routing TAG, R-TAG) included in the transmitted user data are stored. A transmission table controller 503 for controlling, a mini cell assembly unit 504 for assembling channel identification information (CID) and user data to generate a mini-cell, and according to virtual path / virtual channel information An ATM cell assembly unit 508 for generating an ATM cell by multiplexing each mini cell generated by the mini cell assembly unit 504 to the payload of each ATM cell, and each mini cell having different virtual path / virtual channel information; State when assembled An external transmission SRAM 505 for temporarily storing each ATM cell, an internal transmission SRAM 506 for storing a table storing address information of each ATM cell stored in the external transmission SRAM 505, and an internal transmission SRAM An ATM cell assembly unit 508 and a virtual path / virtual channel table controller 507 for controlling input / output of each ATM cell stored in the external transmission SRAM 505 according to the address information of each ATM cell stored in the 506. Transmission output buffer 510 for storing each ATM cell generated in the < RTI ID = 0.0 >), a transmission output buffer controller 509 for controlling the transmission output buffer 510, and each ATM cell generated in the ATM cell assembly unit 508. A timer 512 for outputting at predetermined time intervals, and a status register 511 for managing the status of each device of the AAL-2 transmitter and storing operating parameters for control.

The operation of the AAL-2 transmitter configured as described above is as follows.

First, AAL-2 user data transmitted from multiple AAL-2 users is divided into AAL-2 Negotiation Procedures (ANP) data and user data.

Here, user data means voice packet data transmitted from each mobile station, and ANP data means control data for controlling voice packet data.

Such ANP data and user data are shown in FIGS. 9A and 9B.

Referring to FIG. 9A, the ANP data includes a routing (R-TAG) field of 1 byte, a channel identification (CID) field for distinguishing a plurality of users, a length indication (LI) field indicating the size of user data, A user indication (UUI) field for distinguishing a network manager, an error control (HEC) field for error correction of user data, and a user data field of 1 to 64 bytes.

Referring to Fig. 9B, user data is composed of a 1 byte routing (R-TAG) field and a 1 to 64 byte user data field.

Then, when user data and ANP data are transmitted from a plurality of AAL-2 users, each user data, which is voice packet data, and ANP data, which is a control signal, are stored in the transmission input buffer 500, and the transmission input buffer 500. Each stored user data and ANP data are output under the control of the transmission input buffer controller 501.

At this time, when ANP data is output from the transmission input buffer 500, the ANP data refers to the external transmission defiram 502 and the virtual path (VP) / virtual channel corresponding to its routing information (R-TAG). After the VC) information is obtained, the information is transmitted directly to the ATM cell assembly unit 508 without passing through the mini cell assembly unit 504. The ATM cell assembly unit 508 then multiplexes each transmitted ANP data into the ATM cell payload part to generate ATM cells according to each virtual path (VP) / virtual channel (VC).

However, when user data is output from the transmission input buffer 500, the user data refers to the external transmission defiram 502 and allocates channel identification information (CID) corresponding to its own routing information (R-TAG). The virtual path VP / virtual channel VC information is obtained and then transmitted to the mini cell assembly 504.

Here, the channel identification information (CID) and the virtual path (VP) / virtual channel (VC) information according to the routing information (R-TAG) of the user data and the ANP data are stored in the transmission external depiram 502, and the transmission is performed. The external defiram 502 outputs channel identification information (CID) and virtual path (VP) / virtual channel (VC) information under the control of the transmission table controller 503. At this time, the routing information (R-TAG) included in the user data and the ANP data is the identification address of the channel identification information (CID) and the virtual path (VP) / virtual channel (VC) information stored in the transmission external disk 502. Used.

Then, the mini cell assembly unit 504 uses the inputted user data and the channel identification information (CID) and the virtual path (VP) / virtual channel (VC) information obtained from the external transmission depth 502 to each mini cell. Assemble

Subsequently, each mini cell generated by the mini cell assembly 504 is transmitted to the ATM cell assembly 508, and the ATM cell assembly 508 transfers each transmitted mini cell to the same virtual path / virtual channel. Each ATM cell is generated by multiplexing the payload portion of the ATM cell having the (VC) information.

At this time, the ATM cell assembly unit 508 multiplexes each mini cell transmitted to the ATM cell payload portion as shown in FIG. At this time, the ATM cell assembly unit 508 inserts each minicell into the ATM cell payload portion until the payload portion of the ATM cell is filled, and each completed ATM when one ATM cell composed of 53 bytes is completed. Send the cell to the transmit output buffer 510.

In more detail, each minicell is multiplexed until 48 bytes of CPS-PDUs are filled, and 48 bytes of CPS-PDUs and 5 bytes of virtual path (VP) / virtual channel (VC) information are allocated to the ATM cell. Is generated.

Meanwhile, the ATM cell assembly unit 508 may have mini cells having specific virtual path (VP) / virtual channel (VC) information (for example, when the virtual path (VP) / virtual channel (VC) information is 2/3). Before a ATM cell composed of a mini cell is completed, a mini cell having other virtual path (VP) / virtual channel (VC) information (for example, when the virtual path (VP) / virtual channel (VC) information is 3/7) When input, the ATM cell assembly unit 508 may determine that an incomplete ATM cell (i.e., an ATM cell with virtual path (VP) / virtual channel (VC) information) of 2/3 is associated with an external transmit SRAM. 505. The address information of the incomplete ATM cells stored in the external transmission SRAM 505 is stored in a table of the internal transmission SRAM 506.

Here, the address information stored in the internal transmission SRAM 506 is shown in FIG. 6B, and the variable values stored in the external transmission SRAM 505 are shown in FIG. 6C.

Referring to FIG. 6B, the internal transmission SRAM 506 stores address information of incomplete ATM cells stored in the external transmission SRAM 505. The external transmitting SRAM 505 stores the incomplete ATM cells at an address determined according to each virtual path (VP) / virtual channel (VC) information of the incomplete ATM cells. Therefore, the internal transmission SRAM 506 stores the address of the external transmission SRAM 505 determined according to the virtual path (VP) / virtual channel (VC) information of the incomplete ATM cells.

Referring to FIG. 6C, it can be seen that the ATM cells in an incomplete state are stored in the external transmission SRAM 505 according to the address stored in the internal transmission SRAM 506.

Subsequently, the ATM cell assembly unit 508 may be a mini cell having different virtual path (VP) / virtual channel (VC) information (ie, a mini cell having virtual path (VP) / virtual channel (VC) information of 3/7). Are entered, first retrieve the table stored in the internal transmission SRAM 506 and incomplete state of the ATM cell (i.e., for the other virtual path (VP) / virtual channel (VC)) in the external transmission SRAM 505. ATM cell with virtual path (VP) / virtual channel (VC) information 3/7) stored incomplete from the transmitting external SRAM 505 with 3/7 virtual path (VP) / virtual channel (VC) information Read the variable value related to the ATM cell of the state.

However, if the ATM cell having the virtual path (VP) / virtual channel (VC) information having 3/7 of the virtual path (VP) / virtual channel (VC) information is not stored in the internal transmission SRAM 506, the virtual path. (VP) / Virtual Channel (VC) newly defines ATM cells and related variables corresponding to 3/7.

If the ATM cell and its related variables are defined as new virtual path (VP) / virtual channel (VC) information 3/7, the ATM cell assembly unit 508 continuously transmits the timer 512 after turning it on. Each minicell is assembled by multiplexing it into an ATM cell payload and waiting for input of the next minicell.

Subsequently, when the ATM cell payload is full, the transmit output buffer controller 509 stores the generated ATM cell in the transmit output buffer 510, and the driven timer 512 ends even if the ATM cell payload is not full. As shown in FIG. 11, the unfilled portion is padded with '0' and stored in the transmission output buffer 510.

This is to output after a certain time even if the 48-byte ATM cell payload is not filled by each mini cell.

According to this process, each user data transmitted from the AAL-2 user is multiplexed into a fixed size ATM cell, and then output to the transmit output buffer 510. Each ATM cell stored in the transmit output buffer 510 is an ATM layer. The header is allocated according to the corresponding virtual path (VP) / virtual channel (VC) information and then transmitted to the corresponding destination.

FIG. 7 is a block diagram illustrating an AAL-2 receiver shown in FIG. 4.

Referring to FIG. 7, the AAL-2 receiving end includes a reception input buffer 700 for storing each ATM cell transmitted from the ATM layer, and a reception input buffer controller 701 for reading an ATM cell stored in the reception input buffer 700. And a mini cell disassembly unit 702 for demultiplexing and disassembling each mini cell in the payload of the received ATM cell, and each mini cell disassembled by the mini cell disassembly unit 702 into ANP data and user data. A user data assembly unit 707 for allocating routing information (R-TAG) according to channel identification information (CID) and virtual path (VP) / virtual channel (VC) information of each mini-cell, and a user data assembly unit ( A reception output buffer controller 709 for storing each mini cell output from the 707 in a reception output buffer 708, virtual path / virtual channel (VC) information and channel identification information of the received ATM cell ( External receiving device that manages the table that stores routing information (R-TAG) according to CID) RAM 706, an external receiving SRAM 703 for storing an unassembled mini cell, and an internal receiving SRAM for managing an address of an external receiving SRAM 703 in which an unassembled mini cell is stored ( 704, a mini cell table controller 705 for managing the internal receiving SRAM 705, and a state raster 710.

The operation of the AAL-2 receiver configured as described above is as follows.

First, each ATM cell transmitted from the ATM layer is stored in the receive input buffer 700.

Then, the reception input buffer controller 701 reads and outputs each ATM cell stored in the reception input buffer 700, and the output ATM cells are transmitted to the mini cell disassembly unit 702.

The mini cell disassembly unit 702 demultiplexes and disassembles each mini cell inserted and multiplexed into the payload of each ATM cell, and each mini cell disassembled from the ATM cell payload has its own virtual path (VP) / virtual. The data is transmitted to the user data assembly unit 707 together with the channel VC information.

At this time, the mini cell disassembly unit 702 first disassembles a part of the mini cell when one mini cell is inserted into a plurality of ATM cells and then receives an external receiving SRAM with an associated variable value. After storing at 703, it waits for the arrival of the next ATM cell.

Then, when the ATM cell corresponding to the remaining part of the minicell in the undisassembled state arrives, the minicell disassembly unit 702 disassembles the remaining part and merges the uncelled minicell stored in the external receiving SRAM 703. After completing a mini-cell and transmits to the user data assembly unit 707.

Here, the internal receiving SRAM 704 stores address information of the undisassembled minicell stored in the external receiving SRAM 703. At this time, the undisassembled minicell stored in the external receiving SRAM 703 is addressed according to its virtual path (VP) / virtual channel (VC) information as shown in FIG. 8B.

As such, when each ATM cell arrives, the mini cell disassembly unit 702 first refers to the domestic receiving SRAM 704 via the mini cell table controller 705 and currently arrives at the external receiving SRAM 703. It checks whether there is an undisassembled minicell among minicells of, and if there is an undisassembled minicell according to the result of the check, it reads the undisassembled minicell from the external receiving SRAM 703 and currently arrives. To assemble with the minicell.

The user data assembling unit 707 allocates routing information (R-TAG) according to a corresponding destination to each minicell transmitted from the minicell disassembling unit 702, thereby providing two types of data as shown in FIGS. 9A and 9B. Assemble with

At this time, the routing information (R-TAG) is determined according to channel identification information (CID) and virtual path (VP) / virtual channel (VC) information included in each minicell, as shown in FIG. 8A.

In addition, the user data assembling unit 707 is assembled in the form shown in FIG. 9A when each minicell transmitted from the minicell disassembling unit 702 is ANP data, and in FIG. 9B when each minicell is user data. Assemble in the form shown.

Subsequently, each mini cell to which the routing information R-TAG is allocated in the user data assembly unit 707 is stored in the reception output buffer 708. The reception output buffer controller 709 outputs each mini cell stored in the reception output buffer 708 and transmits the minicells according to the corresponding destination.

As described above, the AAL-2 processing apparatus according to the present invention can be equipped in the base station and the base station controller of the mobile communication system to process AAL-2 data for each user transmitted through multiple channels, thereby increasing system efficiency. There is.

In addition, the AAL-2 device according to the present invention can process AAL-2 data transmitted without limitation of virtual paths and virtual channels, thereby exhibiting excellent performance in terms of system expansion and operation.

Claims (5)

A transmitter for multiplexing each user data transmitted from multiple AAL-2 users to the same ATM cell according to the destination information; AAL-2 processing apparatus supporting a multiple virtual channel, characterized in that it comprises a receiver for demultiplexing each ATM cell transmitted from the ATM layer to the user-specific mini-cell according to the destination, and then transmits to the destination. The method of claim 1, wherein the transmitting end, A first buffer for storing each transmitted user data; A first controller for outputting respective user data stored in the first buffer; A first memory for storing channel identification information (CID) and virtual path (VP) / virtual channel (VC) information for each transmitted user data; A second controller for outputting channel identification information (CID) and virtual path (VP) / virtual channel (VC) information stored in the first memory according to the routing information (R-TAG) of each transmitted user data; A mini cell assembly unit for allocating the stored channel identification information (CID) to the transmitted user data and assembling them into mini cells for each user under the control of the second controller; An ATM cell assembly unit for receiving the assembled user-specific mini cells and multiplexing mini cells having the same virtual path (VP) / virtual channel (VC) information and assembling them into ATM cells; A second memory for storing an unassembled ATM cell; A third memory for storing address information of an unassembled ATM cell stored in the second memory; A third controller for outputting an unassembled ATM cell stored in a second memory with reference to the third memory; A timer for generating a control signal at a predetermined time interval, A fourth controller for outputting each ATM cell assembled by the ATM cell assembly unit at predetermined intervals according to the control signal generated by the timer; AAL-2 processing apparatus for supporting multiple virtual channels, characterized in that the second buffer for storing each ATM cell output from the fourth controller. The method of claim 2, wherein the ATM cell assembly unit, When assembling an ATM cell with specific virtual path (VP) / virtual channel (VC) information, the virtual cell (VP) / virtual channel (VP) different from the ATM cell with the specific virtual path (VP) / virtual channel (VC) information ( When an ATM cell with VC) information is received, stopping the assembly of the ATM cell with the specific virtual path (VP) / virtual channel (VC) information and thus storing the unassembled ATM cell in the second memory. An AAL-2 processing device supporting multiple virtual channels. The method of claim 1, wherein the receiving end, A first buffer for storing each transmitted ATM cell; A first controller for outputting each ATM cell stored in the first buffer; A minicell disassembly unit for demultiplexing each transmitted ATM cell into user-specific minicells; A first memory for storing an undisassembled mini cell; A second memory configured to store address information on an undisassembled minicell stored in the first memory; A second controller configured to output an undisassembled minicell stored in the first memory with reference to the second memory; A third memory storing channel identification information (CID) and routing information (R-TAG) according to virtual path (VP) / virtual channel (VC) information of each of the disassembled mini-cells; A user data assembly unit for allocating routing information (R-TAG) stored in the third memory to each of the disassembled mini cells; And a second buffer configured to store each minicell output from the user data assembly unit. The method of claim 4, wherein the mini cell disassembly unit, When disassembling an ATM cell with specific virtual path (VP) / virtual channel (VC) information, a virtual path (VP) / virtual channel different from the ATM cell with the specific virtual path (VP) / virtual channel (VC) information. When the ATM cell with the (VC) information is received, stopping the disassembly of the ATM cell with the specific virtual path (VP) / virtual channel (VC) information and storing the undissolved minicell in the first memory accordingly. An AAL-2 processing apparatus supporting multiple virtual channels, characterized in that.