KR20000056465A - Base control station apparatus of the IMT 2000 network system using the ATM - Google Patents

Abstract

PURPOSE: A device for a control station of an International Mobile Telecommunication(IMT)-2000 network system using an Asynchronous Transfer Mode(ATM), is provided to supply high-quality voices and various data services, by implementing the device based on an ATM as a BTS Interface Subsystem(BIS), an ATM switch, an ATM Mux/demux Subsystem(AMS) and a Selector Distribution Subsystem(SDS), to transceive an ATM Adaptation Layer(AAL)5/AAL2/AAL1 type of ATM cell data. CONSTITUTION: A device for a control station of an International Mobile Telecommunication(IMT)-2000 network system using Asynchronous Transfer Mode(ATM), comprises a BTS(Base Transceiver Station) Interface Subsystem(BIS,100), an Asynchronous Transfer Mode(ATM) switch(200), an ATM Mux/demux Subsystem(AMS), a Selector Distribution Subsystem(SDS) and a Clock Distributer(CKD). The BIS(100) outputs an ATM Adaptation Layer(AAL)5 intactly, and converts to output AAL2 into the AAL2', by dividing an E1 level of ATM cell data output from an IMT-2000 network system of BTS, into the AAL5 and the AAL2. The BIS(100) outputs the AAL4 to a base station intactly and the AAL2' collected to the base station as the AAL2 type, by discriminating whether the ATM cell inputted is the AAL5 or the AAL2'. The AMS(300) divides ATM cell data output from the ATM switch, into the AAL4 and the AAL2'. The AMS(300) transmits to an exchange via a 155M line if the AAL5, and outputs via a 25M line if the AAL2', or outputs to the exchange if the AAL1, and to the ATM switch via a 155M line if the AAL2', by discriminating whether ATM cell data inputted is the AAL1 or the AAL2'. The SDS(400) outputs to the AMS by making an AAL1 of ATM cell data after vocoding(voice coding) an AAL2' of ATM cell data output from the AMS to convert into PCM data.

Description

Control station apparatus of IMT-2000 network system using asynchronous transmission mode {Base control station apparatus of the IMT 2000 network system using the ATM}

The present invention implements a control station apparatus based on an asynchronous transfer mode (hereinafter, referred to as 'ATM') in an IMT (International Mobile Telecommunication; hereinafter referred to as 'IMT')-2000 network system. The present invention relates to a control station apparatus of an IMT-2000 network system using an ATM capable of supporting high quality voice and various types of data services.

Recently, 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 based on ATM system to provide better service than conventional mobile communication system. By implementing the shape, it is possible to provide high-speed data and multimedia services that cannot be processed in a mobile communication system.

That is, in a mobile communication system, various services are impossible as the data is transmitted using a packet switch, and only a fixed speed data service is supported, and services can be provided only in a limited area.

The present invention has been made in view of the above, and an object thereof is that the shape of the IMT-2000 network system is based on ATM, and in particular, the control station apparatus includes a BTS (BTS Interface Subsystem), an ATM switch, and an AMS (ATM Mux). / demux Subsystem) and SDS (Selector Distribution Subsystem) to provide the control station device of the IMT-2000 network system using ATM to accommodate various needs of subscribers and to support high quality voice and various kinds of data services. There is.

1 is a block diagram of an entire IC-2000 network system using an asynchronous transmission mode according to the present invention;

2 is a block diagram of a control station apparatus of an IMT-2000 network system using an asynchronous transmission mode according to the present invention;

3 is a detailed configuration diagram of AFDA and AMDA in the BIS of the control station apparatus according to the present invention;

4 is a detailed configuration diagram of SMDA and STIA in the AMS of the control station apparatus according to the present invention;

Fig. 5 is a detailed configuration diagram of STIA in SDS of the control station apparatus according to the present invention.

<Explanation of symbols for main parts of drawing>

100: BIS110 to 140: AFDA

150: AMDA200: ATM Switch

300: AMS310,320: SMDA

330-360: STIA 400: SDS

410: STIA420: STBA

500: CKD

The control station apparatus of the IMT-2000 network system using the ATM of the present invention for achieving this purpose, separates the E1 class ATM cell data output from the base station into AAL5 and AAL2, and outputs AAL5 as it is and converts AAL2 to AAL2 '. AAL5 is output to the base station as it is, and AAL5 is collected as it is and AAL2 is collected and outputted to the base station, and outputted to the base station, and AAL5 or AAL2 'outputted from the BIS. The ATM switch that switches ATM cell data and outputs it through a corresponding path, or switches the ATM cell data of AAL5 or AAL2 'inputted to the BIS, and separates the ATM cell data output from the ATM switch into AAL5 and AAL2'. In case of AAL5, it is transmitted to the exchange through 155M line and in case of AAL2 ', it is output through 25M line, or the ATM cell data input is classified as AAL1 or AAL2'. In case of AAL1, the AMS transmits to the switching center, and in the case of AAL2 ', the AMS outputs the ATM switch through the 155M line, and the AAL2' ATM cell data output from the AMS is converted into PCM data, and then the ATM cell data of AAL1 is generated. SDS output to the AMS, and CKD to provide a reference clock for synchronizing the operation of the BIS and the SDS.

Hereinafter, the configuration and operation of a control station apparatus of an IMT-2000 network system using ATM according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an IMT-2000 network system configured as an ATM-based control station apparatus according to the present invention, and includes a user interface unit 11 for performing an interface with a voice terminal, a video / data terminal, and a mobile station. Mobile station control unit 12 for controlling the overall operation of the mobile station consisting of a CDMA and digital demodulation unit 13 for converting the baseband signal and the IF signal, and a radio transceiver 14 for converting the IF signal and the RF signal ( 10), a radio transceiver 21 for converting RF signals and IF signals to each other, a base station controller 22 for controlling the overall operation of the base station, and a CDMA and digital modulation and demodulation unit 23 for converting IF signals and baseband signals to and from each other. ), A base station 20 comprising an ATM interface unit 24 for performing an ATM interface, an ATM interface unit 31 for performing an ATM interface, and a transcoder for PCM encoding / decoding of input / output ATM cell data. (32), the main control unit 33 for controlling the overall operation of the control station, the ATM switch 34 for switching ATM cell data, the system operation management unit 35 for managing the operation of the entire control station, and performs the ATM interface. Switching station 40 consisting of a control station 30 consisting of an ATM interface unit 36, an ATM interface unit 41, a cell controller 42, a mobility controller 43, and a packet controller 44. It consists of

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 AAL (ATM Adaptation Layer) 5 protocol (Protocol) is used for the packet data between the switch and the switching center 40, and the AAL2 protocol is used for the voice data between the base station 20 and the control station 30 (at this time, the control In station 30, it is converted to 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 apparatus of the present invention is based on ATM for accommodating various requests of subscribers, and uses AAL2, AAL5, AAL1, etc. as the AAL type for effective service.

FIG. 2 is a block diagram of a control station apparatus of an IMT-2000 network system using ATM according to the present invention, and shows AAL5 and AAL2 2.048 Mbps E1 ATM cell data output from the base station 20 of the IMT-2000 network system. AAL5 is output as it is and AAL2 is converted to AAL2 'and output, or the input ATM cell is classified as AAL5 or AAL2' and AAL5 is output as it is to the base station 20 and AAL2 'is collected and made into AAL2 form. Switch the ATM cell data of the BIS 100 output to the base station 20 and the AAL5 or AAL2 'outputted from the BIS 100 and output the corresponding path, or switch the ATM cell data of the AAL5 or AAL2' inputted. The ATM switch 200 outputted to the BIS 100 and the ATM cell data outputted from the ATM switch 200 are divided into AAL5 and AAL2 'and, in the case of AAL5, are transmitted to the switching center 40 through the 155M line. In the case of AAL2 ', Alternatively, the AMS 300 transmits to the switching center 40 in the case of AAL1 and outputs the ATM cell data to the ATM switch 200 through the 155M line in the case of AAL2 'by dividing whether the input ATM cell data is AAL1 or AAL2', SDS 400 for vocoding ATM cell data of AAL2 'output from AMS 300 to PCM data and converting ATM cell data of AAL1 to AMS 300 for output to AMS 300; and BIS 100 And a CKD (ClocK Distributer) 500 that provides a reference clock for synchronizing the operation of the SDS 400.

The BIS 100 matches E1 with the base station 20 to receive 16 E1 class ATM cell data, analyzes the header of the E1 class ATM cell data, separates the ATM cell data into AAL5 and AAL2, and then AAL2. For the AAL2 SAR, the packet data of multiple subscribers multiplexed in AAL2 is separated, the packet data of one subscriber is inserted into one ATM cell data, and then a new header is added to form AAL2 ', and then the AAL5 and AAL2' Outputs ATM cell data of AAL5 or AAL5 by classifying whether the input ATM cell data of 155Mbps STM-1 is AAL5 or AAL2 'and outputting AAL2' to ABS2; Four ATM frames / deframe board assemblies (AFDA) 110 to 140, which are outputted to the base station 20, and AAL5 and AAL2 'ATM cell data output from the AFDAs 110 to 140, respectively. The ATM switch with 155Mbps matched through (ATM Mux / Demux board assembly) for outputting to the ATM 200 or receiving AAL5 and AAL2 'ATM cell data output from the ATM switch 200 at 155 Mbps and outputting to the AFDA (110 to 140). It consists of 150.

At this time, as shown in Figure 3, the AFDA (110 to 140) between the LIU (Line Interface Unit) (111-114) for receiving four E1 class ATM cell data, respectively, between the LIU (111-114) It consists of a Cubit (115) to perform IPC (Inter Processor Communication), the AMDA 150 is transmitted and received by matching the input and output ATM cell data at 155Mbps with the qubit 151 performing IPC between 155M UNI It consists of 155M UNI (User Network Interface) (152,153).

As described above, the BIS 100 may connect up to 64 E1s or four STM-1s, two AMDAs 150 may accommodate four AFDAs 110 to 140, and one AMDA 150 may have two. One STM-1, one AFDA (110-140) can mount four E1 LIUs (111-114), and four E1s can be connected to each LIU (111-114), so each AFDA ( 110 to 140 accommodate a total of 16 E1.

The two AMDAs 150 operate as masters / slavers, respectively, and are in charge of alarm processing or inter-system data processing for the entire BIS 100, and each AMDA 150 is 155M UNI (152,153). Load sharing, so that each 155M port processes ATM cell data of one AFDA (110-140), and if an error occurs on the 155M line, the 155M port transfers data on the normal line of the other 155M port instead. Has a structure.

The main functions of the BIS 100 in the control station apparatus include AAL2 function, AAL5 SAR, AAL2 / 5 demultiplexing and multiple function, AAL2 / AAL2 'conversion function, CID (Channel IDentifier) / VPI (Virtual Path Identifier) / VCI (Virtual Channel Identifier) Mapping, CID allocation, physical layer abnormality detection, load sharing for STM-1, and redundancy.

The AMS 300 receives the ATM cell data output from the ATM switch 200 at 155 Mbps, separates the data into AAL5 or AAL2 ', and transmits the AAL5 to the switching center 40 through the 155M line. In case of outputting by branching to a 25M line, or by matching the AAL2 'ATM cell data input through the cell bus 155Mbps and outputs to the ATM switch 200, by matching the ATM cell data of AAL1 input through the cell bus 155Mbps Switched Mux / Demux board assembly (SMDA) 310 and 320 outputted to the switching center 40 and the AAL2 'ATM cell data outputted from the SMDA 310 and 320 are connected to the SMDA 310 and 320 by a cell bus. Selector Transcoder Interface Assembly (STIA) 330 to 360 matching and outputting ATM cell data output from the SDS 400 to the SMDAs 310 and 320 through a cell bus. It consists of.

At this time, as shown in Figure 4, the SMDA (310, 320) is a 155M UNI (311, 312) to match the transmission and reception of the input and output ATM cell data 155Mbps and the qubit 313 to perform the IPC between the 155M UNI (311, 312) The STIAs 330 to 360 are six 25M UNIs 331 to 336 that transmit and receive ATM cell data to and from the 25Mbpss, and a qubit 337 which performs IPC between the 25M UNIs 331 to 336. Is done.

As described above, the AMS 300 is composed of two SMDAs 310 and 320 and four STIAs 330 to 360, and each SMDA 310 and 320 can match two STM-1s. In operation, all alarms are configured to be processed by the master SMDA.

The four STIAs 330 to 360 each have six 25M ports, so the entire AMS 300 has 24 25M ports.

The AMS 300 in the control station apparatus configured as described above separates the ATM cells output from the ATM switch 200 into AAL5 and AAL2 'and transmits them to the switching center 40 through the 155M line in the case of AAL5, and AAL2'. In the case of SIA (330-360) through the 25M line to the SDS (400) is transmitted.

In addition, the ATM cell data output from the SDS 400 is classified as AAL1 or AAL2 'and transmitted to the switching center 40 through the 155M line in the case of AAL1, and the ATM switch 200 through the 155M line in the case of AAL2'. To send.

The main functions of the AMS 300 in the control station apparatus include AAL2 '/ 5 multiple and demultiplex functions, a matching function with the ATM switch 200, a matching function with a core network, a 25 Mbps ATM matching function, Physical layer abnormal state detection function.

The SDS 400 is connected to STIAs 330 to 360 in the AMS 300 through TP25, and AAL2 'via the ATM switch 200 through one 25M line in accordance with two 25M lines. And STIA 410 for processing the AAL1 connected to the switching center 40 through another 25M line, or making the input PCM data AAL1 and outputting it to the AMS 300 through TP25, and the STIA. At 410, the AAL2 'ATM cell data output through the cell bus is vocoded to be converted to PCM data, and then output to the STIA (410) is composed of a Selector Transcoder Board Assembly (STBA) 420, wherein STIA 410 is a 25M UNI (411,412) for transmitting and receiving ATM cell data input and output from the STIA (330 to 360) in the AMS 300 in 25Mbps matching, and the qubit 413 to perform IPC between the 25M UNI (411,412) It consists of

Each STBA 420 has a vocoder capable of processing 30 channels to convert voice data transmitted from the base station 20 into PCM data.

The main functions of the SDS 400 in the control station apparatus include a voice encoding / decoding function, a selector function for soft hand off, a power control function performed in conjunction with the base station 20, and echo. Elimination function, Packet Router function to provide interface with vocoder, Trunk Manager function, Alarm Handler function, Bypass function to improve voice characteristics of mobile station to mobile call Vocoder bypass for data services, and RLP protocol.

Referring to the operation of the IMT-2000 network system using the ATM according to the present invention configured as described above are as follows.

First, when the signal flow is described, when the subscriber of the mobile station 10 requests a call, the base station 20 transmits the information of the subscriber station and ATM cell data corresponding to the call to the control station device, and accordingly, the control station. The AFDAs 110 to 140 in the BIS 100 of the device input the E1 class ATM cell data to check the AAL form of the ATM cell data.

Since the signal is described here, the AAL type of ATM cell data will be AAL5.

Subsequently, the AMDA 150 in the BIS 100 matches the ATM cell data of AAL5 output from the AFDAs 110 to 140 to 155 Mbps, and outputs the same to the ATM switch 200. The ATM switch 200 then outputs the AAL5. ATM cell data is output to SMDAs 310 and 320 in the AMS 300.

Subsequently, the SMDAs 310 and 320 output ATM cell data of AAL5 to STIAs 330 to 360 connected to the FCS through a cell bus, and accordingly, the STIAs 330 to 360 input ATM cell data of AAL5 to 25M. Output to FCS through port.

Then, the FCS receives ATM cell data of AAL5 and allocates a new VPI / VCI to determine which STBA 420 of which SDS 400 should be transmitted from the subscriber. Send the information to.

Next, the flow of ATM cell data of AAL2 is described. If the ATM cell data of AAL2 of subscriber is transmitted to the AFDAs 110 to 140 in the BIS 100 of the control station apparatus through the base station 20, the AFDA 110 140), AAL2 ATM cell data is converted into AAL2 'ATM cell data, and then 155 Mbps is matched through the AMDA 150 and output to the ATM switch 200.

Subsequently, the ATM switch 200 outputs the ATM cell data of the AAL2 'to the SMDAs 310 and 320 in the AMS 300, and the SMDA 310 and 320 checks the header of the ATM cell data of the AAL2' and checks the corresponding STIA (330). -360) outputs AAL2 'ATM cell data, and accordingly, STIA 330-360 outputs AAL2' ATM cell data to one of the SDSs 400 connected to six 25M ports.

Thereafter, the STIA 410 in the SDS 400 analyzes the header of the AAL2 'ATM cell data, selects one of eight STBAs 420, and outputs the selected cell through the cell bus. The input ATM cell data of AAL2 'is converted into PCM data and output again to the STIA 410.

Then, the STIA 410 in the SDS 400 converts the input PCM data into ATM cell data of AAL1 and outputs the STM 330 to 360 in the AMS 300, and then the STIA 330 to 360 in the SDS 400. Receiving the ATM cell data of the AAL1, converting the VPI / VCI value in the header of the ATM cell data of the received AAL1 and outputs to the SMDA 320 connected to the switching center 40, the subscriber's ATM cell data is switched to the switching center (40) To be sent).

As described above, the present invention implements the control station apparatus of the IMT-2000 network system based on ATM with BIS, ATM switch, AMS, and SDS, so that ATM cell data in the form of AAL5, AAL2, AAL1 can be easily transmitted and received. By doing so, it is possible to accommodate various needs of subscribers and to support high quality voice and various kinds of data services.

Claims (4)

The control station apparatus 30 of the IMT-2000 network system based on ATM separates the E1-class ATM cell data outputted from the base station 20 of the IMT-2000 network system into AAL5 and AAL2, and outputs AAL5 as it is and AAL2. Is converted to AAL2 'or outputted, or distinguished whether the input ATM cell is AAL5 or AAL2' and outputs AAL5 to the base station 20 as it is, and collects several AAL2 'to form AAL2 and outputs it to the base station 20 (BIS). 100), ATM switch 200 for switching AAL5 or AAL2 'ATM cell data output from the BIS 100 and outputting the corresponding path, or switching AAL5 or AAL2' ATM cell data for output to the BIS 100; )Wow, The ATM cell data output from the ATM switch 200 is separated into AAL5 and AAL2 'and transmitted to the switching center 40 through the 155M line in the case of AAL5 and output through the 25M line in the case of AAL2' or the input ATM cell data Is AAL1 and AAL2 'to distinguish whether AAL1 is transmitted to the switching center 40, and in the case of AAL2' AMS 300 to output to the ATM switch 200 through the 155M line, SDS 400 for vocoding AAL2 'ATM cell data output from the AMS 300 and converting it into PCM data and making ATM cell data of AAL1 and outputting the AMS 300 to the AMS 300; Control station apparatus of the IMT-2000 network system using an asynchronous transmission mode, characterized in that the BIS (100) and the CKD (500) for providing a reference clock for the operation synchronization of the SDS (400). According to claim 1, The BIS 100, LIU (111-114) for receiving each of the four E1 ATM cell data and a qubit (115) for performing the IPC between the LIU (111 to 114), E1 is matched with the base station 20 to receive 16 E1-class ATM cell data, and the header of the E1-class ATM cell data is analyzed to separate the ATM cell data into AAL5 and AAL2, and then AAL2 SAR for AAL2. After splitting packet data of multiple subscribers multiplexed into AAL2, inserting packet data of one subscriber into one ATM cell data, adding a new header to AAL2 'form, and outputting the ATM cell data of AAL5 and AAL2'. Or, distinguish whether the input ATM cell data is AAL5 or AAL2 'and output it to the base station 20 in case of AAL5, and in the case of AAL2', collect a plurality of AAL2 'to make AAL2 and output it to the base station 20. AFDAs (110 to 140), It consists of a qubit 151 performing IPC between 155M UNIs and 155M UNIs (152,153) matching and transmitting and receiving ATM cell data input and output at 155 Mbps, and the ATM cell data of AAL5 and AAL2 'output from the AFDA (110-140). Is received through the cell bus and output to the ATM switch 200 with 155 Mbps matching, or the ADA5 and AAL2 'ATM cell data output from the ATM switch 200 is received with 155 Mbps matching to the AFDA (110 to 140). Control station apparatus of the IMT-2000 network system using the asynchronous transmission mode, characterized in that consisting of the AMDA (150) for outputting. The ATM of claim 1, wherein the AMS 300 comprises a qubit 313 for performing IPC between the 155M UNIs 311 and 312 and the 155M UNIs 311 and 312 for transmitting and receiving the ATM cell data. Receives ATM cell data output from the switch 200 in 155 Mbps matching and separates it into AAL5 or AAL2 ', transmits it to the switching center 40 through the 155M line in the case of AAL5, and branches and outputs the 25M line in the case of AAL2'. And 155 Mbps of AAL2 'ATM cell data input through a cell bus and output to the ATM switch 200, and 155 Mbps of ATM cell data of AAL1 input through a cell bus and output to the switching center 40. SMDA (310,320), It consists of six 25M UNIs (331 to 336) for transmitting and receiving ATM cell data to and from the 25 Mbps, and a qubit (337) for performing IPC between the 25M UNIs (331 to 336). It is connected through the AAL2 'ATM cell data output from the SMDA (310, 320) to match the 25Mbps to output to the SDS (400), or ATM cell data output from the SDS (400) to match 25Mbps through the cell bus A control station apparatus of an IMT-2000 network system using an asynchronous transmission mode, characterized in that the STIA (330 to 360) output to the SMDA (310, 320). The IPS between the 25M UNI (411,412) and the 25M UNI (411,412) for transmitting and receiving ATM cell data input and output from the STIA (330 to 360) in the AMS 300 in 25Mbps matching It consists of a qubit 413, which is connected to the STIA (330 ~ 360) and TP25 in the AMS (300), through the 25M line in accordance with the provision of two 25M line through the ATM switch 200 STIA 410 that matches AAL2 'via and processes AAL1 connected to the switching center 40 through another 25M line, or makes input PCM data AAL1 and outputs it to the AMS 300 via TP25. Wow, Asynchronous transmission mode, characterized in that the STIA (410) is composed of the STBA (420) vocoding the ATM cell data of the AAL2 'outputted through the cell bus to convert to PCM data and then output to the STIA (410) Control station apparatus of IMT-2000 network system.