KR19990051705A - Wireless receiving packet converter and method in wireless asynchronous transmission mode transmitter - Google Patents

Abstract

The present invention relates to a wireless receiving packet conversion apparatus and method of a wireless asynchronous transmission mode (ATM) transmission apparatus.

Wireless ATM transmission technology is a technology to wirelessly transmit by combining with the existing ATM wired network having a low error rate and high transmission efficiency in order to transmit various types of information such as voice, video, data in the wireless section. In the wireless ATM transmission technology, a technology of converting a data structure for transmitting an ATM cell over the air, that is, a medium access control (MAC) implementation technology is very important. In order for a wireless ATM transmitter to transmit an ATM cell to a destination with a low wireless transmission error rate, data modification only in a wireless section is required. Therefore, the transmitting side in the wireless ATM transmitting apparatus inserts a destination address, a header and a trailer having a low transmission error rate, and transmits the same to the ATM cell in the wired network. There is a need for a wireless receiving packet conversion apparatus for converting received wireless packets into ATM cells.

The present invention makes it possible to analyze the radio transmission characteristics under various radio environments by manufacturing hardware of the radio receiving packet conversion apparatus that can implement such a function.

Description

Apparatus and method for converting wireless received packets in wireless asynchronous transmission mode transmitter

The present invention relates to a wireless receiving packet conversion apparatus and method of a wireless ATM cell control system.

Multimedia services represent various types of information such as voice, data, high-quality still images, and moving images. In order to provide a multimedia service including a video over the air, high-speed data transmission must be performed in a wireless access section. In addition, since multimedia services have a data rate from a low speed to a high speed, and a set call data amount may be variable, a wireless asynchronous transmission mode (hereinafter referred to as ATM) transmission technology has been developed in terms of efficient use of radio resources. The wireless ATM transmission technology is a technique for transmitting an existing ATM wired network having a low error rate and a high transmission efficiency to a wireless section in order to transmit various types of information in the wireless section.

In the wireless ATM transmission technology, a technology for converting a data structure for transmitting an ATM cell over the air, that is, a medium access control (MAC) implementation technology, is a very important technology. In order for a wireless ATM transmitter to transmit an ATM cell to a destination with a low wireless transmission error rate, data modification only in a wireless section is required.

Accordingly, the present invention inserts a destination address, a header and a trailer for having a low transmission error rate in an ATM cell in a wired network, and transmits the same to the ATM cell in the wireless ATM transmitter. On the contrary, an object of the present invention is to provide an apparatus and method for converting a received packet of a wireless asynchronous transmission mode transmitter for converting a received wireless packet into an ATM cell.

The wireless receiving packet conversion apparatus of the wireless asynchronous transmission mode transmission apparatus according to the present invention for achieving the above object is an RS-422 receiving a wireless receiving packet and a clock for restoring the received data, respectively, received through a radio modulation and demodulation unit and an antenna unit. A serial-to-parallel conversion first-in-first-out for storing a receiver, wireless reception packet data input according to an RS-422 interface standard through the RS-422 receiver as a wireless packet, and a wireless packet stored in the serial-parallel conversion first-in-first-out And a digital signal processing processor for converting the wireless packet stored in the SRAM into an asynchronous transmission mode cell according to a program stored in the EPROM.

In addition, the wireless receiving packet conversion method of the wireless asynchronous transmission mode transmission apparatus according to the present invention for achieving the above object is a serial-to-parallel conversion after checking the digital signal processor, Epirom, SRAM initialization and packet reception routine Checking whether the wireless packet has been received at the first-in-first-out basis, and storing the received wireless packet in the SRAM according to the check result, and checking whether there is an error of the wireless packet to be converted, or immediately checking whether the wireless packet is in error. And converting the asynchronous transmission mode cell by removing the header indicating the asynchronous transmission mode transmission packet, the destination address to be transmitted, and the trailer at the rear of the asynchronous transmission mode cell according to the confirmation result. Confirm that you want to send an asynchronous transfer cell, or immediately The steps and, the check result to determine whether to transmit the S-characterized by comprising the process returns to the step to determine that the wireless packet has been received groups parallel converting a first-in, first-out, or a step of transmitting the asynchronous transfer mode cell.

1 is a block diagram of a wireless asynchronous transmission mode transmission apparatus.

Figure 2 is a block diagram of a wireless receiving packet conversion apparatus of a wireless asynchronous transmission mode transmission apparatus according to the present invention.

3 is a flowchart illustrating a method of converting a wireless reception packet according to the present invention.

<Explanation of symbols for main parts of the drawings>

1: 25 Mbps ATM network 2: 25 Mbps ATM matching module

3: wireless transmission packet conversion device 4: PC interface card

5: wireless receiving packet conversion apparatus 6: radio modulation and demodulation unit and antenna unit

7: operation and analysis device 8: filter

9: ATM physical layer (PHY) 10: digital signal processing processor

11, 17: dual port SRAM 12: digital signal processor

13: EPROM 14: SRAM

15: RS-422 Receiver

16: Serial-to-parallel first-in, first-out

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

1 is a configuration diagram of a wireless ATM transmission device, which includes a 25 Mbps ATM network 1, a 25 Mbps ATM matching module 2, a wireless transmission packet conversion device 3, a PC interface card 4, and a wireless reception packet conversion device 5. ), A radio modulation and demodulation unit and an antenna (6), and an operation and analysis device (7).

The 25 Mbps ATM matching module 2 is responsible for ATM interworking between the existing 25 Mbps ATM network 1 and the wireless ATM transmitter. The wireless transmission packet conversion apparatus 3 converts an ATM cell into a wireless transmission packet, and the converted wireless transmission packet is converted into a wireless demodulation unit and an antenna unit through an RS-422 communication interface that is a PC interface card 4 at a speed of 5 Mbps. 6) is delivered. The radio transmission packet 5 is radio-modulated by the radio modulation and demodulation unit and radio-transmitted to the destination via an antenna via a radio frequency (RF) unit. At the time of reception, the radio reception packet received through the radio modulation and demodulation unit and antenna unit 6 is converted into an ATM cell by the radio reception packet conversion device 5. The converted ATM cell is delivered to the 25 Mbps ATM network 1 through the 25 Mbps ATM matching module.

The present invention relates to the implementation of a wireless receiving packet conversion apparatus of such a wireless ATM transmission apparatus, the block diagram of the configuration is shown in FIG.

2 is a block diagram of a wireless receiving packet conversion apparatus of a wireless asynchronous transmission mode transmission apparatus according to the present invention, wherein a signal received from an antenna is demodulated through a radio demodulation unit 6, and the demodulated data is received from a clock for restoring received data. Together with the RS-422 receiver 15 of the wireless receiving packet converter 5, the serial-to-parallel FIFO 16 is stored according to the RS-422 interface standard. . The wireless packet stored in the serial-to-parallel first-in-first-out 16 is stored in the SRAM 14 by the digital signal processing processor 12 and is stored in the EPROM 13. It is processed in order and converted into ATM cells. The digital signal processing processor 12 stores the converted ATM cells in the first and second dual port SRAMs 11 and 17, and then the digital signal processing processor 10 of the ATM matching module 2. ) To send an Interrupt signal. The digital signal processing processor 10 receiving the interrupt signal recognizes that there is an ATM cell to be transmitted, and reads the ATM cell stored in the first dual port SRAM 11. The digital signal processing processor 10 controls the ATM physical layer 9 and is responsible for transmitting and receiving ATM cells in an ATM wired network. The ATM physical layer 9 is responsible for transmitting, disassembling, and combining cells in a 25 Mbps ATM physical layer, using a commercial component IDT77105. The ATM physical layer 9 sends ATM cells to the ATM network through a 25 Mbps filter 8.

3 is a flowchart illustrating a procedure for converting a radio received packet into an ATM cell by the digital signal processing processor 12 according to the present invention.

After checking the initialization and packet reception routines of the digital signal processing processor 12 in step 301 from the start signal, the serial-parallel conversion first-in-first-out 16 confirms whether or not a wireless reception packet has been received (302). If there is a radio reception packet received in the serial-parallel conversion first-in, first-out, the SRAM 14 stores the signal in the SRAM 14 and checks whether an error of the radio reception packet to be converted is an error. If there is no received packet, it is immediately checked whether an error of the wireless received packet (304). If there is no error-free radio received packet, a header (1 byte) indicating a wireless ATM transmission packet in front of the radio received packet, a destination address to be transmitted (1 byte) and a trailer (2 byte) at the rear of the ATM cell. ), And then converting to an ATM cell (305) and confirming whether to transmit the ATM cell, and if there is an error-received wireless packet, it is checked whether to transmit the ATM cell immediately (306). The ATM cell converted as a result of the checking is stored in the dual port SRAM 11 and transmitted to the ATM network through the ATM matching module (307). In addition, the digital signal processing processor 12 stores all the information (statistical information such as the number of received wireless packets, the number of transmission of the converted ATM cell and the number of error occurrences) during the ATM cell conversion process of the wireless received packet. 17) to the PC interface card (4). The controller in the PC interface card 4 transmits statistical information to the IBM-PC 7 according to the RS-232 interface standard.

In the wireless ATM transmission technology, a technology of converting a data structure for transmitting / receiving an ATM cell over the air, that is, a medium access control implementation technology, is a very important technology. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless receiving packet conversion apparatus, which is a main part of a wireless ATM transmission apparatus. The present invention relates to a device for receiving and reconverting a packet transmitted wirelessly to an ATM cell of a wired network.

The wireless receiving packet conversion apparatus according to the present invention can be used as a system for implementing and functional verification of a technology for wirelessly transmitting wired ATM cells. How to restore the structure of the data transmitted wirelessly to the ATM cell to the ATM cell without error is a very important problem for the performance of the wireless ATM transmitter. In addition, by analyzing the contents of the received packet, the receiving side can analyze the wireless ATM transmission characteristics, error characteristics, and conversion status of received data in wireless interval transmission in various environments.

Claims (2)

An RS-422 receiver for inputting a radio reception packet and a clock for restoring data received through the radio modulation and demodulation unit and the antenna unit, respectively; A serial-to-parallel conversion first-in-first-out for storing wireless received packet data input according to an RS-422 interface standard through the RS-422 receiver as a wireless packet; A digital signal processing processor for storing the wireless packet stored in the serial-parallel first-in, first-out (SRAM), and converts the wireless packet stored in the SRAM into an asynchronous transmission mode cell according to a program stored in the EPROM. Wow, And a first and second dual port SRAMs for transmitting the asynchronous transmission mode cells converted from the digital signal processing processor to an asynchronous transmission mode matching module and a PC interface card, respectively. Wireless receiving packet conversion device. Checking the digital signal processing processor, the asynchronous transmission mode physical layer, the pyrom, SRAM initialization and packet reception routines, and then confirming that the wireless packet has been received at the serial-to-parallel first-in, first-out, Storing the received wireless packet in the SRAM according to a result of the checking and confirming whether an error of the wireless reception packet to be converted is found, or immediately checking whether the wireless reception packet is in error; According to the result of the check, the header indicating the asynchronous transmission mode transmission packet in front of the radio reception packet, the destination address to be transmitted, and the trailer after the asynchronous transmission mode cell are removed and converted to the asynchronous transmission mode cell, and then the asynchronous transmission mode cell. Confirming whether or not to transmit, or immediately whether to transmit an asynchronous transmission mode cell; And returning to confirming whether or not the wireless packet has been received by the serial-parallel first-in, first-out according to the checking result or transmitting an asynchronous transmission mode cell. Packet conversion method.