KR20010073908A - AMDA having function of UTOPIA level 2 and data path establishing - Google Patents

Abstract

PURPOSE: An AMDA(ATM Asynchronous Transfer Mode) Multiplexing/Demultiplexing Assembly) having a utopia level 2 function and data routing function is provided to ensure a transparency in data transmission by grouping AFDA(ATM Frame/Deframe Assembly), routing data and transmitting data. CONSTITUTION: A 16-bits cell bus interface part(110) routes to be transmitted to the corresponding port and supports a UTOPIA 2 level of function. A processor(120) performs an ATM SAR(Segmentation And Reassembly) function for data transmitted the corresponding port. A 16-bits multiplexing/demultiplexing part(130) transmits the above data to the corresponding port of two 16-bits UNI(User Network Interface)(140,150) ports. Two 16-bits UNI(140,150) perform an ATM physical layer function, transceive data between the 16-bits multiplexing/demultiplexing part(130) and an ATM exchange(20), and extracts ATM cell from the received data.

Description

AMDA having function of UTOPIA level 2 and data path establishing}

The present invention relates to a base station interface subsystem for matching with a base station (BS) in a radio network controller (RNC) of an international mobile telecommunication system (IMT-2000); BIS), and in particular, in the BIS AMD Multiplexing / Demultiplexing Assembly (Asynchronous Transfer Mode (ATM) multiplexing / demultiplexing device), the AFDA (ATM Frame / Deframe Assembly; Data paths are grouped into group groups to transmit data to ensure transparency of data transmission, and support UTOPIA Level 2 functionality to provide 8: 1 multiplexing / demultiplexing between up to eight AFDA and ATM switches. A multiplexer / demultiplexer (AMDA) with UTOPIA level 2 functionality and data routing configuration.

Figure 1 shows a base station matching subsystem (BIS) block configuration of a typical IMT-2000 control station. BIS consists of four AFDAs (1-4); It consists of an ATM multiplexer / demultiplexer (AMDA) 10 for performing ATM cell multiplexing and demultiplexing functions between the four AFDAs 1-4 and the ATM switch 20.

In order to explain this operation, since the AMDA 10 supports UTOPIA level 1, data transmitted from the AFDA is converted into a virtual channel identifier (VCI) by the 8-bit Cellbus matching unit 11. It is then transmitted to the 8-bit multiplexer / demultiplexer 12.

Then, the 8-bit multiplexing / demultiplexing unit 12 assigns a port by checking a general flow control (GFC) field for flow control in the received data. The data to perform the ATM segmentation and reassembly (SAR) function among the received data performs the ATM SAR function through a layer conversion unit 13 performing a layer conversion function. In addition, the data transmitted to the ATM exchanger checks the designated GFC and transmits the data to the selected port.

The data path setting in the conventional AMDA is made uniform, and if one board is to accommodate twice the AFDA capacity, there is a disadvantage that two AMDA boards must be provided. In addition, all data must be handled by one single port, which reduces data transmission speed and performance. In addition, since the processor 14 is implemented by the MPC860, a layer conversion unit 13, which is an EPLD that performs a layer conversion function, must be separately provided, resulting in a complicated device configuration. In addition, in order to perform the ATM SAR function by supporting the UTOPIA level 1 in the processor 14, the data must pass through the 8-bit multiplexer / demultiplexer 12.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is

In the ATM Multiplexing / Demultiplexing Assembly (AMS) of BIS, AFDA (ATM Frame / Deframe Assembly) is grouped into a group to set the data path to transmit data, ensuring transparency of data transmission, and UTOPIA ATM multiplexer / demultiplexer with UTOPIA level2 capability and data routing to provide Level 1 functionality to provide 8: 1 multiplexing / demultiplexing between up to eight AFDA and ATM switches. AMDA).

In order to achieve the above object, the ATM multiplexing / demultiplexing device (AMDA) having a UTOPIA level 2 function and a data path setting function according to the present invention,

The plurality of AFDAs are grouped into group groups to perform cell bus matching functions for each group group, so that data from the group AFDA can be transmitted to the corresponding port, and 16-bit cell bus matching supporting UTOPIA level 2 function is performed. Wealth;

A processor that performs an ATM SAR function on data transmitted through a corresponding port of the 16-bit Cellbus matching unit;

A 16-bit multiplexer / demultiplexer for transmitting the data to a corresponding one of two 16-bit UNI ports according to the AFDA group to which the data transmitted from the 16-bit Cellbus matching unit belongs;

The technical configuration is characterized by consisting of two 16-bit UNI for transmitting and receiving data between the 16-bit multiplexer / demultiplexer and the ATM switch and extracting an ATM cell from the received data by performing an ATM physical layer function.

1 is a block diagram of a base station matching subsystem of a conventional IMT-2000 control station;

2 is a block diagram of an AT multiplexer / demultiplexer having a utopia level 2 function and a data path setting function according to the present invention.

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

1-8: AFDA 100: AMDA

110: 16-bit Cellbus matching unit 120: Processor

130: 16 bit multiplexer / demultiplexer 140: 16 bit UNI device1

150: 16 bit UNI device2 20: ATM switch

Hereinafter, the AMDA having the UTOPIA level 2 function and the data path setting function according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides a multiplexing / demultiplexing unit by implementing a UTOPIA level 2 function in a BIS that is one of the systems of the IMT-2000 control station to perform only the existing UTOPIA level 1 function in the AMDA board in the IMT-2000 control station. There is no need to have an EPLD separately for hierarchical conversion between processors and processors. In addition, in the present invention, the ATM SAR function may be performed by the multiplexing / demultiplexing unit in the 16-bit cell bus matching unit, thereby providing an efficient method for the data path.

2 is a block diagram of an AMDA block having a UTOPIA level 2 function and a data path setting function according to the present invention.

As shown, a plurality of ATM Frame / Deframe Assemblies (AFDAs) that examine the AAL types of ATM cells transmitted from the base station through the E1 trunk, convert AAL2 ATM cells into AAL2 'ATM cells, and bypass AAL5 ATM cells. (1-8); A plurality of AFDAs (1-8) are grouped into group groups to establish a data path and perform a UTOPIA level 2 function to perform an 8: 1 multiplexing / demultiplexing function between the AFDAs 1-8 and the ATM switch 20. An ATM multiplexing / demultiplexing apparatus (ADMA) 100; It consists of an ATM switch 20 for ATM switching the data transmitted from the AMDA (100).

The ADMA 100 performs a cellbus matching function with the plurality of AFDAs 1-8 and a group group, and sets a path so that data from the group AFDA can be transmitted to the corresponding port, and UTOPIA level 2 function. 16-bit Cellbus matching unit 110 to support the; A processor 120 for performing an ATM SAR function on data transmitted through a corresponding port of the 16-bit CellBus matching unit 110; A 16-bit multiplexer / demultiplexer which transmits the data to a corresponding port among two 16-bit UNI 140 and 150 ports according to the AFDA group to which the data transmitted from the 16-bit Cellbus matching unit 110 belongs ( 130); By performing the ATM physical layer function to send and receive data between the 16-bit multiplexer / demultiplexer 130 and the ATM switch 20, and extracts the ATM cell from the received data to two 16-bit UNI (140) (150) It is composed.

The operation of each device inside the AMDA 100 will be described in detail as follows.

The base station interface subsystem (BIS) in the IMT-2000 Radio Network Controller (RNC) provides voice information, signals, and packets in the form of ATM Adaptation Layer-2 (AAL-2) through an E1 trunk from a base station. An AAL-5 type ATM cell transmitting information is received. AFDA (1-8) is classified by AAL type and converted to AAL-2 '(one packet per cell) in the case of AAL-2 ATM cell. In case of AAL-5 ATM cell, the AAL-5 ATM cell is bypassed and transmitted to a commercial ATM switch via a 155 Mbps connection.

The 16-bit cell bus matching unit 110 performs a function for transmitting ATM cells between the boards in the BIS and includes a cell bus to implement this function. The implementation of Cellbus is implemented using the cellbus matching section on the bus matching section of each board (AFDA, AMDA, STIA), supports UTOPIA level 2, and operates in 16-bit mode. In addition, the interface is configured so that two ports can be used to implement ATM SAR function at the cellbus matching stage.

The 16-bit multiplexing / demultiplexing unit 130 provides a maximum of 8: 1 multiplexing / demultiplexing function and performs UTOPIA level 1 and level 2 interfaces with the physical layer and the ATM layer. In addition, the conventional multiplexing / demultiplexing unit was operated in 8 bits, but in the present invention, it is operated in the 16-bit mode. It performs UTOPIA level 2 function by periodically monitoring UNI ports in a round robin manner, and when an empty port is generated, an address is sent and a signal is sent.

The processor 120 supports the UTOPIA level 2 function and facilitates the ATM SAR function using two ports. The MPC8260 implementation eliminates the need for an EPLD for existing layer transformations. It also doubles the capacity to handle ATM SAR by operating in 16-bit mode, which was previously supported in 8-bit mode, and makes it easier to set up data paths in group groups by using two ports.

In addition, the 16-bit UNI (140) (150) performs the ATM physical layer function, and performs serial and parallel conversion of the serial data input from the optical transceiver, extract the ATM cell from the converted data, and the STM-1 Frame Monitor and control In addition, it performs the opposite function to the output data and transmits the ATM cell to the ATM switch through the optical transceiver. In the past, one port was used for one UNI device, but the 16-bit UNI according to the present invention configures two physical layer devices and enables a port address to set a data path by using two ports per one physical layer device. Do it.

The operation of the AMDA having the UTOPIA level 2 function and the data path setting function according to the present invention as described above is as follows.

First, eight AFDAs (1-8) are divided into two groups (Group 1: AFDA # 0 to # 3, Group 2: AFDA # 4 to # 7).

Data transmitted from the AFDA 1-8 is sensed on which board the data is being transmitted when the 16-bit CellBus matching unit 110 of the AMDA 100 is input through the cellbus. Therefore, when data is transmitted from the board in AFDA, it is possible to set in advance which port to go out for each group.

First, when data is transmitted from a board belonging to Group 1, the 16-bit Cellbus matching unit 110 first determines whether to perform the ATM SAR function or transmit the data to the ATM switch over the 155M optical interface by checking the VCI value. .

As a result, when it is necessary to perform the ATM SAR function, the 16-bit Cellbus matching unit 110 refers to a look-up table of a translation RAM set in advance and transmits data through port b, Tx_clav2. After receiving the ATM SAR function.

When data is transmitted from the board belonging to the group 2, the data is transmitted in the same manner as the data is transmitted from the board of the group 1, and after receiving the signal Tx_clav3 that may transmit the data through the port c, the ATM SAR function is performed. Do this.

If data is to be transmitted to the ATM switch via the 155M optical interface, the 16-bit Cellbus matching unit 110 transmits the data to the 16-bit multiplexer / demultiplexer 130 including the GFC. At this time, the 16-bit multiplexer / demultiplexer 130 monitors the ports of the 16-bit UNI 140 and 150 and transmits data through the ports if there is an empty port.

That is, when data is transmitted from a board belonging to group 1, the 16-bit multiplexer / demultiplexer 130 detects a port in the 16-bit UNI device 1 140, and if there is an empty port (available port), After receiving the address of Tx_clav1, which transmits data, the data is transmitted to the port.

In the case of transmitting data from the board belonging to group 2, the 16-bit multiplexer / demultiplexer 130 monitors the port in the 16-bit UNI device 2 150. When it receives Tx_clav2, which is a signal to send data, it transmits data to the port.

In addition, when data is transmitted from the ATM switch to the 16-bit CellBus matching unit 110, if the data performs the ATM SAR function among the data transmitted through the port d, the port b of the 16-Bit Cellbus matching unit 110 is used. To perform the function. The data transmitted on port e performs ATM SAR function on port c.

As described above, in the present invention, the hierarchical conversion function operates in the 16-bit mode, thereby performing the ATM SAR function at high speed, and thus, it is possible to increase the AFDA. In addition, by supporting both UTOPIA Level 1 and Level 2 functions, future ports become easier to use.

In addition, data paths are uniformly set up, and data transmissions are grouped into AFDA group groups to designate paths, thereby eliminating data redundancy and ensuring data transmission transparency.

Claims (1)

A base station interface subsystem (BIS) equipped with a plurality of ATM frames / deframe assemblies (AFDAs) and AMD multiplexers (AMDAs) at an IMT-2000 Radio Network Controller (RNC); In an ATM exchanger, The AMDA, The plurality of AFDAs are grouped into group groups to perform cell bus matching functions for each group group, so that data from the group AFDA can be transmitted to the corresponding port, and 16-bit cell bus matching supporting UTOPIA level 2 function is performed. Wealth; A processor that performs an ATM SAR function on data transmitted through a corresponding port of the 16-bit Cellbus matching unit; A 16-bit multiplexer / demultiplexer for transmitting the data to a corresponding one of two 16-bit UNI ports according to the AFDA group to which the data transmitted from the 16-bit Cellbus matching unit belongs; UTPIA Level 2, comprising two 16-bit UNIs that transmit and receive data between the 16-bit multiplexer / demultiplexer and the ATM switch and extract ATM cells from the received data by performing an ATM physical layer function. AMT Multiplexer / Demultiplexer (AMDA) with functions and data routing.