KR20030023233A - AAL2 matching device in IMT - 2000 node's bandwidth - Google Patents

Abstract

PURPOSE: An AAL2 interface device in an IMT-2000 node band is provided to implement a function of an AAL2 protocol as a DSP(Digital Signal Processor) and an EPLD(Erasable Programmable Logic Device), thereby distributing an ATM communication function to AAL2 ATM cells and other ATM cells as well as distributing to a CPS(Common Part Sublayer) function and an SSSAR(Service Specific Segmentation and Reassembly) function. CONSTITUTION: An EPLD unit(30) decides whether ATM cells inputted from an ATM communication line(20) are AAL2 ATM cells or other ATM cells, transmits the ATM cells to a processor(10), and performs functions of an ATM layer and a CPS layer for the AAL2 ATM cells. A DSP unit(40) is connected with the EPLD unit(30) by a DSP bus, performs a function of an SSSAR layer by receiving VPI, VCI, CID information, and CPS packet information from the EPLD unit(30), and transmits the VPI/VCI/CID information and the CPS packet information to the EPLD unit(30) in reference to channel information.

Description

AAL2 matching device in IMT-2000 node's bandwidth}

The present invention relates to an ATM Adaptive Layer (AAL) matching processing system in an IMT-2000 node band (A-B). In particular, the present invention relates to an asynchronous transmission mode (ATM) used for data line efficiency in an IMT-2000 node band. In implementing the AAL2 layer protocol, the AAL2 protocol functions as a digital signal processor (DSP) and EPLD (EPLD) to enable high-speed AAL2 cell processing and reduce the load on the processor. The present invention relates to an AAL2 matching device in the IMT-2000 node band that enables economical system construction such as enabling the use of low-cost processors.

As is well known, ATM communication in the IMT-2000 system applies the AAL2 protocol to traffic data for the efficiency of communication lines.

To do this, the processor is used to perform the functions of the Common Part Sublayer (CPS) layer, the Service Specific Segmentation and Reassembly (SSSAR) layer, and the ATM layer of AAL2, which are heavily loaded on the processor, and thus the processor performs other functions. In order to solve this problem, it is necessary to use a high performance processor to solve this problem.

Accordingly, an object of the present invention is to solve the conventional problems as described above, and an object of the present invention is to implement the function of the AAL2 protocol with a digital signal processor (DSP) and an EPLD, thereby improving the function of ATM communication. In addition to enabling injection processing to AAL2 ATM cells and other ATM cells, and enabling injection processing with CPS and SSSAR functions, high-speed AAL2 cell processing is possible, as well as reducing the load on the processor. The aim is to provide an AAL2 matched processor in the IMT-2000 node band that enables the use of processors in a cost-effective system.

1 is a block diagram of an AAL2 matching processing system in an IMT-2000 node band in accordance with one embodiment of the present invention.

Figure 2 is a detailed block diagram of the EPLD unit in one embodiment of the present invention.

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

10; ATM communication line 20; Processor

30; EPLD section 31; First receiver

32; A first transmitter 33; router

34; A first CPS processor 35; Memory

36; A second CPS processor 37; Second receiver

38; A second transmitter 39; Mux part

40; DSP part

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

1 is a block diagram of an AAL2 matching processing system in an IMT-2000 node band according to an embodiment of the present invention, and FIG. 2 is a detailed block diagram of an EPLD unit according to an embodiment of the present invention.

1 and 2, the processor 10 and the ATM communication line 20 to be connected through a utopia interface (utopia interface),

After determining whether the ATM cell inputted from the ATM communication line 20 is an AAL2 ATM cell or another ATM cell, the ATM cell is transmitted to the processor 10, and the AAL2 ATM cell functions of the ATM layer and the CPS layer. An EPLD unit 30 for performing a function;

The EPLD unit 30 is connected to the DSP bus, and a virtual path identifier (VPI), a virtual channel identifier (VCI), CID information, and a CPS packet are transmitted from the EPLD unit 30. A DSP unit 40 for receiving VPI / VCI / CID information and CPS packet information together with the EPLD unit 30 by receiving information and performing a function of the SSSAR layer; It is characterized by the configuration.

According to another aspect, the EPLD portion 30,

A first receiver (utopia Rx1) 31 for receiving an ATM cell from the ATM communication line 20;

After calculating the VPI / VCI value of the ATM cell received from the first receiving unit 31, after determining whether the received ATM cell is an AAL2 ATM cell or another ATM cell from the calculated value, the determination result A router (ROUTER) 33 for transmitting all ATM cells except for the AAL2 ATM cell to the processor 10 through the first transmission unit (utopia Tx1) 32;

A first CPS processor 34 for receiving the AAL2 ATM cell determined from the router 33, extracting one or more CPS packets from the ATM cell, and then transmitting each extracted CPS packet together with VPI / VCI information. Wow,

A memory unit (Dual Port Memory) 35 for storing CPS packets and VPI / VCI information transmitted from the first CPS processor 34 and providing the stored information to the DSP unit 40;

By periodically searching the information stored in the memory unit 35 to check whether new data is input from the DSP unit 40, and performing the function of the CPS layer by referring to the VPI / VCI value of the retrieved data, A second CPS processor 36 for transmitting;

After muxing the ATM cell received from the processor 10 through the second receiver (utopia Rx2) 37 and the ATM cell received from the second CPS processor 36, the second transmitter (utopia) is muxed. Mx (39) for transmitting to the ATM communication line 20 through the Tx2) (38).

Referring to Figures 1 and 2 attached to the operation of the embodiment of the present invention configured as described above are as follows.

First, the EPLD unit 30 is connected through the processor 10, the ATM communication line 20, and the utopia interface, and the EPLD unit 30 and the DSP unit 40 are connected by a DSP bus. Put it.

Subsequently, when an ATM cell is input from the ATM communication line 20 to the EPLD unit 30, the EPLD unit 30 determines whether the input ATM cell is an AAL2 ATM cell or another ATM cell. The cell transmits to the processor 10 and the AAL2 ATM cell performs the functions of the ATM layer and the CPS layer.

That is, when an ATM cell transmitted from the ATM communication line 20 is received through the first receiver 31 included in the EPLD unit 30, the router 32 included in the EPLD unit 30 After calculating the VPI / VCI value of the ATM cell received from the first receiver 31, it is determined whether the received ATM cell is an AAL2 ATM cell or another ATM cell from the calculated value.

From the determination result, all ATM cells except the AAL2 ATM cell are transmitted to the processor 10 through the first transmission unit (utopia Tx1) 32, and the AAL2 ATM cell is transmitted to the first CPS processor 34. do.

Then, the first CPS processor 34 extracts one or more CPS packets from the received AAL2 ATM cell, and transmits the extracted CPS packets to the memory unit 35 along with the VPI / VCI information.

At this time, the memory unit 34 is connected to the DSP unit 40 through a DSP bus,

The DSP unit 40 receives the VPI / VCI / CID information and the CPS packet information to perform the function of the SSSAR layer, and then refers to the channel information to the memory unit 34 to the VPI / VCI / CID information and the CPS packet information. Will be sent together.

That is, the DSP unit 40 performs a function of the CPS layer based on the received VPI / VCI / CID information and CPS packet information, and transfers the same to the SSSAR terminal of the corresponding channel with reference to the VPI / VCI / CID information. .

Then, the SSSAR stage performs this SAR function by receiving this information, and when one frame is completed, transmits the completed frame to the upper protocol frame by frame, and if not, waits for the reception state of the next data. Will be.

Meanwhile, the second CPS processor 36 included in the EPLD unit 30 periodically searches for information stored in the memory unit 35 to check whether new data is input from the DSP unit 40. bar,

After performing the function of the CPS layer by referring to the VPI / VCI value of the data retrieved from the inspection result, the ATM cell is transmitted to the mux unit 39.

At this time, the mux unit 39 is such that the ATM cell is received from the processor 10 through a second receiver (utopia Rx2) 37.

The mux unit 39 muxes the ATM cell received through the second receiver (utopia Rx2) 37 and the ATM cell received from the second CPS processor 36, and then muxes the ATM cell. By transmitting to the ATM communication line 20 through the utopia Tx2) 38, the processor 10 can perform other functions while preventing the overload caused by the functions of the CPS layer, the SSSAR layer, and the ATM layer of AAL2. It will be easy to implement.

As described above, the present invention implements the function of the AAL2 protocol with a Digital Signal Processor (DSP) and an EPLD, thereby enabling the injection processing of the ATM communication function to the AAL2 ATM cell and other ATM cells. Of course, high-speed AAL2 cell processing is possible, such as the injection processing with the CPS function and the SSSAR function, and the economical system construction can be achieved while reducing the load on the processor, thereby enabling the use of low-cost processors. To provide the effect.

Claims (2)

Connect through processor and ATM communication lines and utopia interface, After determining whether the ATM cell inputted from the ATM communication line is an AAL2 ATM cell or another ATM cell, the ATM cell transmits to the processor and the AAL2 ATM cell performs an ATM layer function and a CPS layer function. ; And, The EPLD unit is connected to the DSP bus, and receives the VPI / VCI / CID information and the CPS packet information from the EPLD unit to perform the SSSAR layer function, and then refers to the channel information to the EPLD unit with the VPI / VCI / CID information. DSP unit for transmitting the CPS packet information together; ALA 2 matching device in the IMT2000 node band, characterized in that consisting of. The method of claim 1, wherein the EPLD unit, A first receiver which receives an ATM cell from an ATM communication line, After calculating the VPI / VCI value of the ATM cell received from the first receiver, it is determined whether the received ATM cell is an AAL2 ATM cell or another ATM cell from the calculated value, and then AAL2 is determined from the determination result. A router for transmitting all ATM cells except the ATM cell to the processor through the first transmitter; A first CPS processor configured to receive the AAL2 ATM cell determined from the router, extracting one or more CPS packets from the ATM cell, and transmitting each extracted CPS packet together with VPI / VCI information; A memory unit for storing CPS packets and VPI / VCI information transmitted from the first CPS processor and providing the stored information to a DSP unit; A second CPS processor for periodically searching for information stored in the memory unit and checking whether new data is input from the DSP unit and performing a function of the CPS layer by referring to the VPI / VCI value of the retrieved data and transmitting an ATM cell; And IMT comprising a mux unit for muxing the ATM cell received from the processor through the second receiver and the ATM cell received from the second CPS processor and transmitting it to the ATM communication line through the second transmitter. ALA-2 matching processor in the 2000 node band.