KR0185867B1 - Apparatus for interfacing a sar layer and a physical layer with common buffer in utopia interface - Google Patents

Abstract

The present invention provides a utopia interface in which buffering is efficiently performed by providing a reception buffer for receiving and storing data transmitted from each layer in the SAR layer and the physical layer in data transmission between the SAR layer and the physical layer A SAR layer transmitter 10 for performing cell multiplexing on a cell input from an upper layer of the SAR layer 20, a physical layer 30 for transmitting data to and from the PHY layer 30, A sixth FIFO 16 for receiving and storing packet data from the sixth FIFO 16 and a SAR layer receiving unit 18 for dividing the packet data from the sixth FIFO 16 into cells, A fifth FIFO 15 for receiving and storing the cell data from the SAR layer transmitter 10 of the SAR layer 20 and a fifth FIFO 15 for collecting and organizing the cell data from the fifth FIFO 15, And a physical layer receiver 26 for collecting and arranging packet data from the physical medium. When the SAR layer 20 and the physical layer 30 are connected to each other, The fifth and sixth FIFOs 15 and 16 are efficiently used.

Description

Interface between partition and assembly layer and physical layer with integrated buffer in utopia interface

The present invention relates to a connection device between a partitioning and assembling layer and a physical layer having an integrated buffer in a utopia interface. In particular, in data transmission between a SAR layer and a physical layer, data transmitted from each layer to a SAR layer and a physical layer is received The present invention relates to an interface between a partitioning and assembling layer and a physical layer having an integrated buffer in a utopia interface in which utilization of a buffer is made efficient by installing an integrated buffer for storing data.

In general, the ATM technology is suitable for high-speed and broadband communication (B-ISDN) as a communication technology for dividing a message having an arbitrary size into a plurality of ATM cells each having a size of 53 bytes and transmitting through a transmission medium. It is attracting attention as a next generation communication technology to replace fiber distributed data interface (FDDI) in the network field.

In this way, when a network such as an ATM LAN or an ATM WAN is configured using ATM technology, an ATM connection device, that is, an ATM adapter or an ATM card is required to connect a host system or a terminal to an ATM network. The apparatus divides an arbitrary message to be transmitted by the host system according to a predetermined AAL protocol (for example, AAL1, AAL2, AAL3 / 4, AAL5) to form an ATM cell or reassembles the received ATM cell to restore the message A SAR (segmentation and reassembly) layer, and a physical layer for encoding ATM cells received from the SAR layer and transmitting the encoded ATM cells to the SAR layer.

In addition, in order to provide flexibility to use an ATM connection device (hereinafter referred to as an ATM adapter) for various transmission media, a standard connection protocol is set between the SAR layer and the physical layer, and even if the physical layer is implemented in various forms Protocol, it is possible to easily connect to the SAR layer.

Meanwhile, the UTOPIA (Universal Test and Operations Interface for ATM) is a standard interface method set by a company and a research institute for early use of ATM technology. As described above in the ATM forum, the connection between the SAR layer and the physical layer .

1 is a block diagram showing a utopia interface between a general partitioning and assembly (SAR) layer and a physical layer, where 20 denotes a SAR layer, which functions as a unique function of the SAR layer, A first FIFO 11 for storing transmission cells from the SAR layer transmission unit 10, a second FIFO 11 for storing packet data from the physical layer 30, A third FIFO 13 for receiving and storing the packet data, and a SAR layer receiving unit 18 for dividing the packet data from the third FIFO 13 into cells.

In the figure, reference numeral 30 denotes a physical layer. The physical layer 30 includes a second FIFO 12 for receiving and storing cell data from the first FIFO 11 of the SAR layer 20, A physical layer transmitter 24 for collecting and organizing the cell data from the second FIFO 12 and transmitting the data to the physical medium, a physical layer receiver 26 for collecting and arranging packet data from the physical medium, And a fourth FIFO (14) for receiving and storing packet data from the physical layer receiver (26).

The functions of the SAR layer and the physical layer as described above are already manufactured and marketed as integrated circuits, and various integrated circuits for the physical layer are already widely used.

As described above, the utopia connection scheme is a standard access scheme between the physical layer and the SAR layer proposed by the ATM Forum, and the connection signals are transmitted from the SAR layer to the physical layer by using TxData [7: 0], TxSOC, / TxEnb, / TxFull , TxClk, and the connection signals upon reception from the physical layer to the SAR layer are RxData [7: 0], RxSOC, / RxEnb, and / RxEmpty.

TxData [7: 0] is ATM cell data (hereinafter, referred to as ATM cell transmission data or transmission data) transmitted from the SAR layer to the physical layer in units of bytes, and TxSOC indicates the start (Hereinafter referred to as a transmission cell start signal) for indicating that the transmission data (TxData [7: 0]) is a start of call (SOC) Th byte.

/ TxEnb is for informing that the transmission data (TxData [7: 0]) transferred from the SAR layer to the physical layer is valid cell data, and valid cells ) / TxFull indicates that the transmission data transmitted to the physical layer is full (hereinafter referred to as a transmission full signal) to indicate that data can not be received any more .

RxData [7: 0] is ATM cell data (hereinafter, referred to as ATM cell reception data or reception data) transmitted in bytes from the physical layer to the SAR layer, and RxSOC indicates the transmission clock from the physical layer (Hereinafter referred to as a receiving cell start signal) indicating that the ATM cell is started with the SAR layer. When this signal is high, byte data output to the received data RxData [7: 0] It is the first byte.

/ RxEnb is for informing that the received data (RxData [7: 0]) transferred from the physical layer to the SAR layer is valid cell data. When there is valid cell data in the received data RxData [7: 0] / RxEmpty is activated when the data in the physical layer is empty to signal that there is no more data to be transmitted (hereinafter referred to as a reception buffer beam signal).

In the case of performing data transmission between the SAR layer and the physical layer as described above, the respective buffers are used before and after the transmission and reception in the SAR layer and the physical layer, thereby degrading the buffer efficiency.

In the physical layer and the SAR layer, each layer, for example, the SAR layer, performs tasks such as partitioning a cell into cells, scheduling a cell, As shown in FIG. Thereafter, in the first FIFO 11 in the SAR layer, the cell is transmitted to the second FIFO 12 of the physical layer while exchanging signals with the second FIFO 12 of the physical layer.

Thus, the blocks that perform other tasks in the SAR layer are limited by the size of the first FIFO 11, and other functional blocks within the physical layer are limited by the size of the second FIFO 12. [ That is, the two FIFOs 11 and 13 and the FIFOs 12 and 14 are separately used in the respective layers, thereby failing to effectively use the capacity of the FIFO.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an integrated buffer for receiving and storing data transmitted from each layer in a SAR layer and a physical layer in data transmission between a SAR layer and a physical layer, And to provide a connection device between a partitioning and assembling layer and a physical layer having an integrated buffer in a utopia interface adapted to be efficiently performed.

According to another aspect of the present invention, there is provided a method for controlling a mobile communication system including a SAR layer transmitter for performing cell multiplexing with respect to cells input from an upper layer of a SAR layer, a sixth FIFO for receiving and storing packet data from a physical layer, A fifth FIFO configured by a physical layer for receiving cell data from the SAR layer transmitter of the SAR layer and storing the cell data; And a physical layer receiving unit for collecting and arranging packet data from the physical medium, wherein when the SAR layer and the physical layer are connected, the fifth layer And 6 FIFOs are efficiently used.

According to the present invention configured as described above, the reception buffer is provided for receiving and storing data transmitted from each layer in the SAR layer and the physical layer in data transmission between the SAR layer and the physical layer, do.

1 is a block diagram illustrating a utopia interface between a general partitioning and assembly (SAR) layer and a physical layer;

FIG. 2 is a block diagram illustrating a connection device between a partitioning and assembling layer and a physical layer having an integrated buffer in a utopia interface according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: SAR layer transmission units 11 to 16: First to sixth FIFO

18: SAR layer receiver 20: SAR layer

24 physical layer transmission unit 26 physical layer reception unit

30: Physical layer

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a connection device between a partitioning and assembling layer and a physical layer having an integrated buffer in a utopia interface according to the present invention, wherein the same components as those of the conventional device are denoted by the same reference numerals, It is omitted.

The SAR layer 20 includes a SAR layer transmitter 10, a sixth FIFO 16 for receiving and storing packet data from the physical layer 30, and a sixth FIFO 16 for storing packet data from the sixth FIFO 16, And a SAR layer receiving unit 18 for dividing the SAR layer.

The physical layer 30 includes a fifth FIFO 15 for receiving and storing cell data from the SAR layer transmitter 10 of the SAR layer 20 and a fifth FIFO 15 for receiving cell data from the fifth FIFO 15 A physical layer transmitter 24 for collecting and organizing the packets and transmitting them to a physical medium, and a physical layer receiver 26 for collecting and arranging packet data from the physical medium.

Here, in the buffer efficiency method of the present invention, one FIFO is used, and this FIFO is installed in a layer for receiving data. That is, the FIFOs 15 and 16 are provided in the physical layer 30 on the transmitting side and on the SAR layer 20 on the receiving side, respectively. In this case, since the other functional blocks of the SAR layer 20 are in contact with the large fifth FIFO 15 of the physical layer 30, it is more effective in transferring data in this case, .

On the other hand, when the SAR layer 20 and the physical layer 30 use different operation clocks, if an overflow or an underflow occurs in the FIFO, an underflow or an overflow Are transmitted to the respective layers to limit the data flow to each buffer.

For example, when the SAR layer 20 generates an overflow or an underflow from the fifth FIFO 15, the SAR layer 20 recognizes the overflow or underflows or processes the interrupt or sends an interrupt signal to an upper layer to generate an interrupt. This is performed almost in the same way as in the conventional SAR layer 20 and the physical layer 30.

Therefore, in the present invention, if a FIFO is installed in one layer, for example, a layer for receiving data, the buffer can be used more efficiently than if it is installed in two layers.

It should be noted that the drawings are not intended to limit the technical scope of the present invention to the embodiments shown in the drawings in order to facilitate understanding of the present invention.

As described above, according to the present invention, in the data transmission between the SAR layer and the physical layer, the reception buffer is provided for receiving and storing data transmitted from each layer in the SAR layer and the physical layer, .

Claims (2)

A SAR layer transmitter 10 for performing cell multiplexing on cells input from the upper layer of the SAR layer 20, a sixth FIFO 16 for receiving and storing packet data from the physical layer 30, And a SAR layer receiver 18 for dividing the packet data from the FIFO 16 into cells so that the physical layer 30 can transmit cell data from the SAR layer transmitter 10 of the SAR layer 20 A fifth FIFO 15 for receiving and storing the packet data, a physical layer transmitter 24 for collecting and organizing the cell data from the fifth FIFO 15 and transmitting the data to the physical medium, And a physical layer receiving unit 26 for collecting and organizing the physical layer 30. When the SAR layer 20 and the physical layer 30 are connected, the fifth and sixth FIFOs 15 and 16 are efficiently used. The partitioning and assembly layer with an integrated buffer in the interface Connection devices between the physical layer. The system according to claim 1, wherein the fifth and sixth FIFOs (15, 16) each include first and second FIFOs (11, 12), third and fourth FIFOs (13, An interface between a partitioning and assembly layer and physical layer with an integrated buffer in the interface.