KR100285325B1 - AAL2 data transmission method in base control station of the IMT-2000 network - Google Patents

Abstract

According to the present invention, in the AFDA of the BIS in the control station of the ATM-based IMT-2000 network system, various base stations, signals, data, user and channel IDs, etc. can be easily changed according to the VPI / VCI value of the AAL data header input from the base station. The present invention relates to a method of transmitting AAL data in a control station of an IMT-2000 network system that enables the base station and a control station to transmit and receive ATM cell data smoothly. Receives and checks the VPI / VCI value of the AAL data header, and as a result of this check, outputs to AMDA as it is for AAL5 data, and converts VCI / CID to VPI / VCI value while converting to AAL2 'data for AAL2 data. After that, AMDA multiplexes AAL5 and AAL2 'data into 155Mbps signals and outputs them to the ATM switch, and AAL data input from the ATM switch. Received via AMDA to check the VPI / VCI value of the AAL data header, and as a result of this check, the AAL5 data is outputted to the base station as it is. It converts and outputs to the base station.

Description

AAL data transmission method in base control station of the IMT-2000 network

The present invention provides a control station of an International Mobile Telecommunication (IMT) -2000 network system based on an asynchronous transfer mode (hereinafter, referred to as 'ATM') from a base station. IMT which enables the smooth transmission and reception of ATM cell data between the base station and the control station according to the value of Virtual Path Identifier (VPI) / Virtual Channel Identifier (VPI) of the ATM Adaptation Layer (AAL) data header A 2000 method for transmitting AAL data in a control station of a network system.

Recently, the IMT-2000 network system, which is newly emerging to provide mobile multimedia service of voice system and non-voice system using the world common frequency band, is a digital communication method of circuit mode to provide more advanced service than the conventional mobile communication system. It implements the system shape based on ATM which integrates the communication mode of packet and packet mode to provide high speed data and multimedia service that mobile communication system cannot handle.

In other words, the ATM method establishes a virtual channel in a connectivity manner to deliver a service. Whenever a virtual channel is established, a connection identification number is assigned, and when the connection is released, the connection identification number is also released. It is preserved by the function of the ATM layer, and signaling information for connection establishment is transmitted through separate ATM cell data.

1 is an overall block diagram of an IMT-2000 network system using a general ATM, a user interface unit 11 for interfacing with a voice terminal, a video / data terminal, and a mobile station control unit 12 for controlling overall operations of a mobile station. ), A code division multiple access (CDMA) and digital demodulation unit 13 for converting baseband signals and intermediate frequency (IF) signals, and a wireless transceiver 14 for converting IF signals and radio frequency (RF) signals. A mobile station 10 comprising: a radio transceiver 21 for converting RF signals and IF signals; a base station controller 22 for controlling overall operations of the base station; and CDMA and digital converting IF signals and baseband signals. Pulse Code Modulation (PCM) encoding / decoding of the base station 20 including the modulation / demodulation unit 23, the ATM interface unit 24 performing the ATM interface, the ATM interface unit 31 performing the ATM interface, and the input / output ATM cell data. Transcoder unit 32 for coding processing, main control unit 33 for controlling the overall operation of the control station, ATM switch 34 for switching ATM cell data, and system operation for operating and controlling the operation of the entire control station. A control station 30 composed of a management unit 35, an ATM interface unit 36 that performs an ATM interface, an ATM interface unit 41, a cell controller 42, a mobility controller 43, and a packet. It consists of an exchange station 40 consisting of a controller 44.

As described above, the IMT-2000 network system based on ATM has the following characteristic structure compared with the conventional mobile communication system.

That is, based on ATM, an ATM connection is provided for the transmission of signals / data between the base station 20 and the control station 30, an ATM connection is provided for communication between the subsystems in the control station 30, An ATM connection is provided for the transmission of signals / data between the control station 30 and the switching center 40.

In the protocol structure, a signal between the subsystems in the control station 30, a signal between the base station 20 and the control station 30, a packet data between the base station 20 and the control station 30, and a control station 30 ) Uses the AAL5 protocol for packet data between the switching station 40 and the switching center 40, and uses the AAL2 protocol for voice data between the base station 20 and the control station 30 (at this time, in the control station 30 AAL2 ').

In addition, TIA / EIA IS-634A (SS7 # 7 over ATM) is used for the signal between the control station 30 and the switching center 40, and the AAL1 protocol is used for voice data between the control station 30 and the switching center 40. Ethernet protocol is used for operational data between RMS and FCS.

As described above, the control station 30 is based on ATM to accommodate various requests of subscribers, and in this case, AAL2, AAL5, AAL1, etc. are used as the AAL type for effective service.

2 is a block diagram of a control station 30 of an IMT-2000 network system using a general ATM, and includes a plurality of ATM Frame / Deframe board assemblies (AFDAs) 110 to 140 and AMD Mux / Demux board assemblies (AMDAs). It is composed of 150, the E48-class ATM cell data output from the base station 20 of the IMT-2000 network system separated into AAL5 and AAL2, AAL5 is output as it is, AAL2 is converted to AAL2 'output, or The BIS (BTS Interface Subsystem) 100 which distinguishes whether the input ATM cell data is AAL5 or AAL2 'and outputs AAL5 to the base station 20 as it is, and collects a plurality of AAL2's into AAL2 form and outputs them to the base station 20. ATM switch 200 for switching AAL5 or AAL2 ATM cell data output from the BIS 100 and outputting the corresponding path or switching ATM cell data of AAL5 or AAL2 to be outputted to the BIS 100. Switch Mux / Demux board Assembly (SMDA) (310,320) and STIA (Selec) tor Transcoder Interface Assembly (330 to 360), which separates the ATM cell data output from the ATM switch 200 into AAL5 and AAL2, and transmits the AAL5 to the switching center 40 through the 155M line in the case of AAL5. AMS (ATM) outputting through the 25M line, or whether the input ATM cell data is AAL1 or AAL2, and transmits to the switching center 40 in the case of AAL1 and outputs to the ATM switch 200 through the 155M line in the case of AAL2. Mux / demux Subsystem (300), STIA (410) and STBA (Selector Transcoder Board Assembly) 420, vocoded ATM cell data of AAL2 output from the AMS (300) to convert to PCM data CKD (SDS) 400 which generates ATM cell data of AAL1 and outputs it to the AMS 300 and provides a reference clock for synchronizing operation between the BIS 100 and the SDS 400. ClocK Distributer) (500).

Meanwhile, the AFDAs 110 to 140 in the BIS 100 of the control station 30 configured as described above analyze the header of the E1 class ATM cell data input from the base station 20 to separate the ATM cell data into AAL5 and AAL2. Then, separate the packet data of multiple subscribers multiplexed into AAL2 through AAL2 data or AAL2 data, and insert the packet data of one subscriber into one ATM cell data and add a new header. AAL2 'form to output ATM cell data of AAL5 and AAL2' to AMDA 150, or AAL5 by discriminating whether ATM cell data of 155Mbps STM-1 input through AMDA 150 is AAL5 or AAL2 '. Data is output to the base station 20 as it is, and in the case of AAL2 'data, a plurality of AAL2's are collected to make AAL2 data and output to the base station 20.

In addition, the AMDA 150 receives ATM cell data of AAL5 and AAL2 'output from the AFDAs 110 to 140 through a cell bus and outputs the same to the ATM switch 200 at 155 Mbps, or the ATM switch ( AAL5 and AAL2 'ATM cell data output from 200 are received at 155 Mbps and output to the AFDAs 110-140.

As described above, in the AFDAs 110 to 140 in the BIS 100 of the IMT-2000 network system control station 30, the AAL data input from the base station 20 according to the VPI / VCI value of the ATM cell data header is AAL2. It is determined whether the AAL5 or AAL5 and the AAL data input from the ATM switch 200 via the AMDA (150) AAL2 'or AAL5 is required to separate and separate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to provide an AFDA of a BIS in a control station of an ATM-based IMT-2000 network system according to a VPI / VCI value of an AAL data header input from a base station. IMT-2000 network system that makes it possible to easily transmit and receive ATM cell data between the base station and the control station by easily distinguishing various base stations, signals, data, users, and channel IDs. The present invention provides a method for transmitting AAL data in a control station.

1 is an overall block diagram of an IMT-2000 network system using a general asynchronous transmission mode,

2 is a block diagram of a control station of an IMT-2000 network system using a general asynchronous transmission mode;

Figure 3 (a) is an operation flowchart showing a transmission method of the transmission method of the AEL data in the control station of the IMT-2000 network system according to the present invention, (b) is an operation flowchart showing a receiving method.

<Description of the symbols for the main parts of the drawings>

100: BIS110 to 140: AFDA

150: AMDA200: ATM Switch

300: AMS310,320: SMDA

330-360: STIA 400: SDS

410: STIA420: STBA

500: CKD

In the method of transmitting AAL data in the control station of the IMT-2000 network system of the present invention for achieving the above object, in the AFIS in the BIS of the control station, the AAL data received from the base station is received to check the VPI / VCI value of the AAL data header. As a result of this check, AAL5 data is output to AMDA as it is, AAL2 data is converted to AAL2 'data, and VCI / CID is converted to VPI / VCI value and output to AMDA, and then AA5 and AAL2' Multiplex data into 155Mbps signal and output it to ATM switch.AAL data input from ATM switch is received through AMDA to check VPI / VCI value of AAL data header, and as a result, AAL5 data is output to base station as it is. In the case of AAL2 'data, the AAL2 data is converted to AAL2 data and the VPI / VCI is converted into a VCI / CID value and output to the base station.

Hereinafter, a method of transmitting AAL data in a control station of an IMT-2000 network system according to the present invention will be described in detail with reference to the accompanying drawings.

3A is an operation flowchart showing a transmission method among AAL data transmission methods in a control station of an IMT-2000 network system according to the present invention, and (B) is an operation flowchart showing a reception method.

First, referring to the transmission flowchart of FIG. 3A, the AFDAs 110 to 140 in the BIS 100 of the control station shown in FIG. 2 receive AAL data, which is an E1-class ATM cell data input from a base station. (S1), and check the VPI / VCI value of the received AAL data header (S2).

As a result of the confirmation in step S2, when the value of VCI, that is, VCI [15] = 1 and VCI [9] = 0 (S3), the AAL5 data output from the AFDA 110-140 of its own is used as it is. (S4), and if VCI [15] = 0 and VCI [9] = 0 (S5), it recognizes that the AAL data received from the base station is AAL5 data and outputs it to the AMDA 150 as it is. (S6) Finally, when VCI [15] = 0 and VCI [9] = 1 (S7), the AAL data received from the base station recognizes that the AAL2 data is type conversion in AFDA (110 to 140). ;) TC) converts this AAL2 data into AAL2 'data and simultaneously converts the VCI / CID into a VPI / VCI value and outputs it to the AMDA 150 (S8).

Thereafter, the AMDA 150 multiplexes the data of AAL5 and AAL2 'output from the AFDAs 110 to 140 at 155Mbps as in the respective steps S4, S6, and S8 to output them to the ATM switch 200 ( S9).

Next, referring to the reception flowchart of FIG. 3 (b), the AFDAs 110 to 140 in the BIS 100 in the control station shown in FIG. 2 are input from the ATM switch 200 via the AMDA 150. AAL data is received (S11), and the VPI / VCI value of the received AAL data header is checked (S12).

As a result of the check in step S12, when the value of VCI, that is, VCI [15] = 1 and VCI [9] = 0 (S3), the received AAL data is processed in its AFDA (110 to 140). Recognizing that it is AAL5 data to be output (S14), and if VCI [15] = 0 and VCI [9] = 0 (S15) recognizes that the AAL data received from the AMDA 150 is AAL5 data. And outputs to the base station as it is (S16), and finally, if VCI [15] = 0 and VCI [9] = 1 (S17), it recognizes that the AAL data received from the AMDA 150 is AAL2 'data and then provides AFDA ( 110-140 converts the AAL2 'data into AAL2 data and simultaneously converts VPI / VCI to VCI / CID values to output the E1 signal to the base station (S18).

On the other hand, the bit value of the VCI [14:10] is assigned to recognize the E1 port number (1 to 32) of the base station.

As described above, the present invention can easily perform various base stations, signals, data, user and channel IDs, and the like through three conditions according to the VPI / VCI values of the AAL data header input from the base station or AAL data header input from the ATM switch. By dividing, it is possible to smoothly perform ATM cell data transmission and reception between the base station and the control station without error.

Claims (1)

In the method for transmitting and receiving ATM cell data input and output from the AFDA (110 to 140) in the BIS 100 of the IMT-2000 network system control station based on the ATM divided into AAL5 and AAL2, AAL data transmission method in the AFDA (110 to 140) in the BIS (100) of the control station is a first step of receiving the AAL data input from the base station to confirm the VPI / VCI value of the AAL data header, and the first As a result of the checking in the step, when VCI [15] = 1 and VCI [9] = 0, the second step of outputting the AAL5 data output from the AFDA 110 to 140 to the AMDA 150 as it is, and the second step As a result of checking in step 1, when VCI [15] = 0 and VCI [9] = 0, a third node recognizing that AAL data from the base station received in step 1 is AAL5 data and outputting the same to the AMDA 150 as it is. Step, and when the result of the check in the first step, VCI [15] = 0 and VCI [9] = 1, the AFDA 110-140 recognizing that the AAL data from the base station received in the first step is AAL2 data. In this type conversion block, this AAL2 data is converted to AAL2 'data and VCI / CID is converted to VPI / VCI value and output to AMDA 150. And a fifth step of multiplexing the AAL5 and AAL2 'data of the AFDAs 110 to 140 output from the second to fourth steps to 155 Mbps by the AMDA 150 and outputting them to the ATM switch 200. The AAL data reception method in the AFDA (110 to 140) in the BIS 100 of the control station receives the AAL data input from the ATM switch 200 via the AMDA 150, and the VPI of the AAL data header. A1 from the ATM switch 200 received in the first step when the first step of checking the / VCI value and the result of the check in the first step, VCI [15] = 1 and VCI [9] = 0. A second step of recognizing that the data is AAL5 data to be processed in its AFDA (110 to 140) and outputting to the corresponding block, and as a result of checking in the first step, VCI [15] = 0 and VCI [9] = If 0, the third stage recognizing that the AAL data from the ATM switch 200 received in the first step is AAL5 data and outputting the same to the base station as it is. And if the result of the check in the first step is VCI [15] = 0 and VCI [9] = 1, AFDA recognizes that the AAL data from the ATM switch 200 received in the first step is AAL2 'data. And a fourth step of converting the AAL2 'data into AAL2 data in the type conversion block (110-140) and simultaneously converting the VPI / VCI to the VCI / CID value and outputting the E1 signal to the base station. -2000 data transmission method in the control station of the network system.