KR100592875B1 - Wireless bridge device for IEEE 1394 - Google Patents

Abstract

The present invention relates to a wireless bridge device which is connected to a wired IEEE1394 port to provide a demodulation function between wired and wireless data. The present invention is connected to an IEEE1394 port of a computer communication device or a digital electronic device to provide wired IEEE1394 data. It converts into IEEE 802.11a / e wireless LAN (Local Area Network) data with guaranteed quality of service and transmits wirelessly at transmission speed of 6 ~ 54Mbps in 5GHz band, or wires IEEE802.11a / e wireless LAN data. By converting back to IEEE1394 data, high-speed transmission and QoS can be guaranteed.

IEEE802.11a / e, IEEE 1394, Bridge, IEEE1394, Access Point

Description

IIEE1394 type wireless bridge device {Wireless bridge device for IEEE 1394}             

1 is a network diagram made by applying the wireless bridge device of the present invention.

2 is a block diagram of a wireless bridge device according to the present invention.

3 is a detailed block diagram of a physical layer unit in the wireless bridge device according to the present invention.

4 is a structural diagram of an IEEE802.11 MSDU frame applied to a wireless bridge device according to the present invention.

5 is a structural diagram of an IEEE802.11 MPDU frame applied to the bridge device according to the present invention.

6 is a structural diagram of an IEEE802.11a PPDU frame applied to a bridge device according to the present invention.

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

31: Transmission queue 32: Transmission management unit

33: transmission protocol control unit 34: access category mapping unit

35: Transmission scheduler 36 ~ 39: FIFO storage unit

40: MPDU generator 41: MAC receiver

42: receive protocol control 43: receive queue (QUEUE)

44: reception management unit

The present invention connects to an IEEE1394 port and converts wired IEEE1394 data to IEEE802.11a / e wireless LAN (Local Area Network) data, or IEEE1394 to inversely convert IEEE802.11a / e wireless LAN data to wired IEEE1394 data. It relates to a wireless bridge device of the scheme.

Recently, with the development of digital and communication technology, the boundary between computer and home appliances has been broken down, and the establishment of interoperable communication environment has become a key issue. The need for high speed data communication of computer peripherals and multiplexing equipment has led to the necessity of new communication technologies. The IEEE 1394 high speed serial bus standard enables the interconnection of digital home appliances, computer peripherals and automation equipment, and high speed multimedia data communication. Is fully supported.

Developed by Apple Computer, Inc. in the United States and standardized by the IEEE P1394 Technical Committee, IEEE1394, also known as Firewire, is a shielded twisted air (STP) with a maximum length of 4.5 m between devices. It is a technology that allows serial data transmission by connecting up to 63 electronic devices including personal computers, mobile communication devices, peripheral devices, and video cameras. Data rates are 100, 200 and 400 megabits per second. There are six wires, two are power lines, four are signal lines, and the coding scheme uses DS Link, which is replacing the RS-232 serial bus that has been used as a PC input / output standard.

In addition, even in the data communication method, the wired communication method is gradually replaced by the wireless communication method due to problems such as cable management or cost. Currently, the standard for the wireless LAN is the IEEE 802.11a and 802.11b standards. It is proposed.

The 802.11 standard is a wireless LAN standard having a transmission rate of up to 11 Mbps using a 2.4 GHz frequency band. Sub-modulation is performed using a direct sequence spread spectrum (DSSS) method and a data rate is 1, 2 using a BPSK or QPSK periphery technique. Can speed up to 5.5, 11 Mbps.

Accordingly, in order to wirelessly connect peripheral electronic devices including personal computers and home appliances for home automation, a wireless bridge device for changing between wired data and wireless data is required.

Thus, in Korean Patent Application Publication No. 2002-43146, an ultra-high speed WLAN apparatus using IEEE1394 that allows wireless transmission of high-capacity information by combining the serial transmission interface IEEE1394 method with a wireless LAN has been proposed, which is an IEEE802.11b standard. In this case, the wireless transmission rate is 11Mbps, which is slow, and QoS is not guaranteed, and thus, real-time isochronous A / V data cannot be transmitted.

Accordingly, the present invention has been proposed to solve the above-mentioned drawbacks, and its object is to convert IEEE1394 data into IEEE 802.11a / e wireless LAN data which is guaranteed QoS while having a wireless transmission speed of 6 to 54 Mbps. It is possible to perform the inverse conversion, and to provide an IEEE 1394 wireless bridge device capable of transmitting not only asynchronous data but also real-time isochronous audio / video data.

As a construction means for achieving the above object, the present invention is connected to the IEEE1394 port, and outputs the IEEE1394 transmission signal separated into the bridge isochronous transmission data and transaction asynchronous transmission data, and receives the bridge isochronous reception data and transaction asynchronous reception data multiplexed An IEEE 1394 matching unit for outputting to an IEEE 1394 port; Receives IEEE802.11a wireless LAN reception signal, converts and outputs bridge isochronous received data and transactional asynchronous transmission data, receives bridged isochronous transmission data and transactional asynchronous transmission data, converts it into IEEE802.11a wireless LAN signal, and transmits An IEEE802.11a / e matching unit; A wired / wireless bridge function between the IEEE1394 point and the IEEE802.11a / e point, which is connected between the IEEE1394 matching unit and the IEEE802.11a / e matching unit and analyzes and sets a frame of bridge isochronous transmission / reception data and asynchronous transmission / reception data. High performance serial bus bridge to perform; And a control unit for controlling the IEEE1394 matching function, the bridge function, and the IEEE802.11a / e matching function.

In addition, in the above-described IEEE 1394 type wireless bridge device, the IEEE 1394 matching unit is connected to the IEEE 1394 port, IEEE1394 physical layer unit for transmitting and receiving IEEE1394 signal; The transmission data input from the IEEE 1394 physical layer unit is separated into bridge isochronous transmission data and transactional asynchronous transmission data and output to a high performance serial bus bridge, and simultaneously inputted bridge isochronous reception data and transaction asynchronous reception data are multiplexed to the IEEE1394 physical layer. An IEEE1394 link layer unit for transferring to a unit; And a first transaction unit connected to the high performance serial bus bridge to perform read, write, and lock processing of asynchronous data.

In the above-described IEEE1394 type wireless bridge device, the IEEE802.11a / e matching unit is connected to the high performance serial bus bridge to perform a second transaction unit for reading, writing, and locking asynchronous data. ; A protocol adaptation layer (PAL) for IEEE802.11e that converts IEEE1394 transmission data from the high performance serial bus bridge into IEEE802.11e PAL transmission data, converts IEEE802.11e PAL reception data into IEEE1394 data, and applies it to a high performance serial bus bridge. part; An IEEE802.11e MAC unit for performing conversion between the IEEE802.11 PAL transmit / receive data and the IEEE802.11 MAC transmit / receive data input / output to the protocol adaptation layer unit; An IEEE802.11a physical layer unit connected to the IEEE802.11e MAC unit to perform conversion between IEEE802.11 MAC transmit / receive data and IEEE802.11a physical layer data; And an RF unit for modulating and transmitting the transmitted data output from the IEEE802.11a physical layer unit into an RF signal of a 5 GHz band, demodulating the RF received signal into IEEE802.11a physical layer data, and transmitting the demodulated data to the IEEE802.11a physical layer unit. It is done by

Further, in the above-mentioned IEEE1394 type wireless bridge device, the IEEE802.11e MAC unit receives PAL transmission data in the form of IEEE802.11 MSDU frame from the IEEE802.11e PAL unit and transmits MSDU transmission data to the transmission protocol control unit. A transmission queue for performing the; A transmission manager which generates frame control data and frame management data and transmits the same to the transmission queue; Converts MSDU transmission data inputted from the transmission queue into transmission protocol control data, receives MSDU reception data status signals of other wireless 1394 bridges from the reception protocol control unit, generates a request to send (RTS) frame, etc., to the access category mapping unit. A transmission protocol control unit for transmitting and outputting a transmission scheduler control signal according to a user priority; An access category mapping unit configured to receive the transmission protocol control data and output the classification by access category according to a user priority; A plurality of FIFO storage units for storing data for each of the access categories output from the access category mapping unit; A transmission scheduler for controlling a signal output of the plurality of FIFO storage units so that data is transmitted in priority order according to the transmission scheduler control signal; An MPDU generation unit for converting data for each access category sequentially input from the FIFO storage unit into MAC data and outputting the MAC data to the IEEE802.11a physical layer unit; A MAC receiving unit which receives MAC data of IEEE802.11a from the IEEE802.11a physical layer unit, extracts MDSU data, and delivers the MDSU data to a receiving protocol control unit; A reception protocol control unit which converts the MSDU received data input from the MAC receiver into reception protocol control data and transmits the received MSDU received data status signal to a transmission protocol control unit; A reception queue which receives the reception protocol control data of the reception protocol controller and separates the received protocol control data into asynchronous data, real-time isochronous A / V data, control data and management data; And a reception management unit that receives control and management reception data from the reception queue and manages reception of the IEEE802.11e MAC unit.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a network diagram showing an application example of a wireless bridge device according to the present invention.

In FIG. 1, the IEEE 1394 device 11 is any kind of digital home appliance having an IEEE 1394 port, and examples thereof include a digital camcorder, an HDTV, a home theater, a personal computer, and the like. Connected to the bus, it provides the ability to transfer not only asynchronous data but also real-time isochronous A / V data together at a fast transfer rate of 100Mbps 3.2Gbps.

In addition, the wireless bridge device 12 is a wired / wireless matching unit proposed by the present invention. The wireless bridge device 12 is connected to the IEEE1394 device 11 by wire, and transmits 6 ~ 54Mbps in 5GHz band while guaranteeing QoS by wireless. It is connected to an access point (AP) 13 of IEEE802.11a / e scheme that provides speed. The wireless bridge device 12 converts the IEEE1394 data of the IEEE1394 device 11 into the wireless LAN data of the IEEE802.11a / e system, and conversely converts the wireless LAN data of the IEEE802.11a / e system to the IEEE1394 data. Do this.

In addition, the access point 13 operating in the IEEE802.11a / e scheme performs a wireless LAN station function by itself and provides a distributed service access function to the wirelessly connected wireless bridge devices 12 or other access points. .

Next, Figure 2 shows a detailed configuration of the wireless bridge device 12 according to the present invention, the wireless bridge device 12 is connected to the IEEE1394 device 11 via the IEEE1394 bus, and transmits and receives IEEE1394 signals IEEE 1394 physical layer unit 21, which encodes / decodes 100 Mbps to 3.2 Gbps data transmitted and received, and performs a bus arbitration function, and IEEE 1394 link data from the IEEE 1394 physical layer unit 21. Receive and separate the bridge isochronous data and the transaction asynchronous data, and then transfer them to the high performance serial bus bridge 24 and the transaction unit 23a, respectively, and the bridge isochronous data and the transaction unit 23a of the high performance serial bus bridge 24, respectively. IEEE 1394 link layer unit 22 for multiplexing transaction asynchronous data of the IEEE 1394 physical layer unit 21, and the IEEE 1394 link layer unit 22 and a high performance serial bus bridge 2 4) between the high-performance serial bus bridge 24 and the IEEE802.11e PAL unit 25, the transaction unit 23a, 23b for performing asynchronous data read, write, and lock processing; A high performance serial bus bridge 24 performing wired and wireless bridge functions between an IEEE 1394 point and a wireless IEEE 802.11a / e point, and between the high performance serial bus bridge 24 and the transaction unit 23b and the IEEE 802.11e MAC unit 26. A protocol adaptation layer (PAL) unit 25 for IEEE802.11e that performs management services, transaction services, and isochronous services to equally support application services operating in an IEEE1394 environment, and the IEEE802. It is provided between the 11e PAL unit 25 and the IEEE802.11a physical layer unit 27 to convert between PAL data in the form of IEEE802.11 MSDU frame and MAC data in the form of IEEE802.11 MAC Protocol Data Unit (MPDU) frame. IEEE802.11e MAC part 26 to perform, 6 to 54 between the MAC data in the form of IEEE802.11 MPDU frame of the IEEE802.11e MAC unit 26 and the IEEE802.11a physical layer data in the form of an IEEE802.11a PPDU (PLCP Protocol Data Unit) frame of the RF unit 28. Receives IEEE802.11a physical layer data from the IEEE802.11a physical layer unit 27 performing OFDM modulation and demodulation at a transmission rate of Mbps, and the IEEE802.11a physical layer data from the IEEE802.11a physical layer unit 27 and modulates the antenna into RF signals in a 5 GHz band. An RF unit 28 for transmitting to the IEEE 29a physical layer data, receiving the 5 GHz band RF signal from the antenna 29, and transmitting the demodulated data to the IEEE 802.11a physical layer unit 27; And an antenna 29 for transmitting / receiving an IEEE802.11a wireless LAN signal in a 5 GHz band to / from 28 and a control unit 30 for controlling a wireless bridge operation through operation control of each block.

The high performance serial bus bridge 24 more specifically performs a bridge packet generation or extraction function to insert or extract information added in a bridge environment to an IEEE1394 packet, and read, write and lock for asynchronous data stream transmission. (Lock) Performs transaction routing function that handles request and response for processing, performs stream operation function that sets path by analyzing frame information of asynchronous data stream and isochronous data stream. Bridge portals of interconnected serial buses, when changed, perform a Net Update function that cooperates with each other and updates the network configuration, performs a Global Node ID configuration function, and uses the same cycle time on the bus. Performs a cycle timer synchronization function that provides Time.

Further, the IEEE802.11e PAL unit 25 more specifically multiplexes bridge isochronous data from the high performance serial bus bridge 24 and asynchronous data from the transaction unit 23b to perform IEEE802.11 MSDU (MAC Service) service. Data Unit) converts into PAL data in the form of a frame, receives PAL data from the IEEE802.11e MAC section 26, converts the PAL data into IEEE1394 data, and separates it into bridge isochronous data and transactional asynchronous data. And the transaction unit 23b.

The IEEE802.11e MAC unit 26 is more specifically, carrier sense multiple access with collision (CSMA / CA), which is a basic access method of the IEEE802.11 MAC, so that multiple wireless 1394 bridges can share a single wireless channel. It performs DCF (Distributed Coordination Function) access function of Avoidance) and HCF (Hybrid Coordination Function) access function to support QoS so that asynchronous data of IEEE1394 and real time isochronous A / V data can be transmitted together.

More specifically, the controller 30 controls and manages the IEEE 1394 physical layer unit 21 using the IEEE 1394 physical layer unit control signal, and controls the IEEE 1394 link layer unit 22 using the IEEE 1394 link layer unit control signal. And management; control and manage transaction units 23a and 23b using transaction unit control signals; control and manage high performance serial bus bridge 24 using high performance serial bus bridge control signals; Control and manage the IEEE802.11e PAL unit 25 using the .11e PAL unit control signal, control and manage the IEEE802.11e MAC unit 26 using the IEEE802.11e MAC unit control signal, Control and manage the IEEE802.11a physical layer unit 27 using the .11a physical layer unit control signal, and control and manage the 5 GHz band RF unit 28 using the 5 GHz band RF unit control signal. .

Referring to the operation of the wireless bridge device shown in FIG. 2 as follows.

The IEEE1394 physical layer unit 21 is connected to the IEEE1394 bus to transmit and receive IEEE1394 signals, perform data encoding / decoding functions of 100 Mbps to 3.2 Gbps, and performs bus arbitration. The IEEE 1394 link layer unit 22 performs an IEEE 1394 cycle control function, performs a packet transmission and reception function, receives IEEE 1394 link data from the IEEE 1394 physical layer unit 21, and separates the bridge isochronous data and transaction asynchronous data. Here, the bridge isochronous data is transferred to the high performance serial bus bridge 24, and the transaction asynchronous data is converted into the bridge asynchronous data through the transaction unit 23a and transferred to the high performance serial bus bridge 24.

The high performance serial bus bridge 24 receives and multiplexes the input bridge isochronous data and the bridge asynchronous data to implement and transfer the IEEE 1394 link data to the IEEE 1394 link layer unit 21.

In addition, the high performance serial bus bridge 24 performs a wired / wireless bridge function between a wired IEEE1394 and a wireless IEEE802.11a / e wireless LAN.

The IEEE 802.11e PAL unit 25 receives bridge isochronous data from the high performance serial bus bridge 24, receives asynchronous data from the transaction unit 23b, and multiplexes the IEEE1394 data according to the IEEE802.11 MSDU. Convert to PAL data in frame form.

Subsequently, the IEEE802.11e MAC section 26 converts the PAL data output from the PAL section 25 for IEEE802.11e into MAC data in the form of an IEEE802.11e MPDU frame to the IEEE802.11a physical layer section 27. To pass.

The IEEE802.11a physical layer unit 27 receives MAC data in the form of an IEEE802.11 MPDU frame from the IEEE802.11e MAC unit 26, OFDM modulates at a transmission rate of 6 to 54 Mbps, and performs an IEEE802.11a PPDU (PLCP). Protocol Data Unit) is converted into IEEE802.11a physical layer data in the form of a frame and transmitted to the RF unit 28. In addition, the IEEE 802.11a physical layer data in the form of an IEEE802.11a PPDU frame received from the RF unit 28 is received, OFDM demodulated, and inversely converted into MAC data is transmitted to the IEEE802.11e MAC unit 26. .

The RF unit 28 receives the IEEE802.11a physical layer data from the IEEE802.11a physical layer unit 27 and modulates it into a 5 GHz band RF signal to transmit to the antenna 29, and then receives another 5 GHz received from the antenna 29. The band RF signal is demodulated into IEEE802.11a physical layer data and transmitted to the IEEE802.11a physical layer unit 27.

By the above, IEEE data of the IEEE 1394 device 11 is transmitted as an RF signal according to the IEEE802.11a / e standard, and a WLAN signal of the IEEE802.11a / e standard is converted into IEEE1394 data and connected to the IEEE1394 device 11. Delivered.

3 is a detailed configuration diagram of the provided IEEE802.11e MAC unit 26, wherein the IEEE802.11e MAC unit 26 transmits PAL in the form of an IEEE802.11 MSDU frame from the IEEE802.11e PAL unit 25. A transmission queue 31 for receiving and temporarily storing data, receiving and temporarily storing control and management transmission data from the transmission management unit 32, and then transmitting the MSDU transmission data to the transmission protocol control unit 33; , A management unit 32 for generating control data such as a Power Save-Poll frame and management data such as an association request frame, and transmitting the control data to the transmission queue 31, a plurality of wireless 1394 bridges, and one radio. It performs CSF / CA type DCF connection function, which is the basic connection method of IEEE802.11 MAC, and HCF connection function that supports QoS to transmit asynchronous data and real-time isochronous A / V data of IEEE1394. By converting the MSDU transmission data inputted from the transmission queue 31 into transmission protocol control data, the MSDU transmission data is transferred to the access category mapping unit 34, and the MSDU reception data state of the other wireless 1394 bridges is received from the reception protocol control unit 42. A transmission protocol control unit 33 for receiving a signal, generating a request to send (RTS) frame, etc., and transmitting the same to the access category mapping unit 34, and transmitting a transmission scheduler control signal to the transmission scheduler 35; The access category mapping unit 34 which receives the transmission protocol control data from the control unit 33 and divides the access protocol (AC: Access Category) according to the user priority, and stores them in the respective FIFOs 36 to 39 according to the priority. And the plurality of FIFOs 36 to 37 so that data is transmitted in order of priority in accordance with the transmission scheduler control signal applied from the transmission protocol control unit 33. A transmission scheduler 35 applying a sequential channel access signal to the channel and the access category mapping unit 34 receives and stores AC0 data, AC1 data, AC2 data, and AC3 data, respectively, and then stores the channels of the transmission scheduler 35. AC0 transmission data, AC1 transmission data, and AC2 transmission according to a plurality of FIFO storage units 36 to 39 and the transmission scheduler 35 transmitting schedule data activated and stored by the access signal to the MPDU generation unit 40. MPDU generation unit 40 which sequentially receives data and AC3 transmission data, converts and converts the data into MAC data in the form of IEEE802.11 MPDU frame, and IEEE802.11a physical layer unit 27 shown in FIG. 11 MAC receiver 41 which receives MAC data in the form of MPDU frame, performs frame address determination, duplicate frame check, FCS (Frame Check Sequence) check, and delivers the MSDU data to the reception protocol controller 42. While converting the MSDU received data input from the MAC receiver 41 into the received protocol control data and transferring the received data to the receive queue 43, a CTS (Clear To Send) frame or an ACK (Acknowledgement) frame is detected and MSDU received thereto. Receive protocol control unit 42 for transmitting the data status signal to the transmit protocol control unit 33, and receive protocol control data of the receive protocol control unit 42 to receive asynchronous data, real-time isochronous A / V data, control data and management The data is separated into a data, and the separated asynchronous data and real-time isochronous A / V data are converted into PAL received data in the form of IEEE802.11 MSDU frame and transferred to the PAL unit 25 for IEEE802.11e. A reception queue 43 transmitted to the management unit 44 and a number of receiving control and management reception data from the reception queue 43 to manage reception of the IEEE 802.11e MAC unit 26. It consists of the management unit 44.

In detail, the access category mapping unit 34 converts the background asynchronous data having the fourth priority to AC0 data and stores the AC0 data in the FIFO storage unit 36, and the third priority is Best Effort. The asynchronous data is converted into AC1 data and stored in the FIFO storage unit 37, and the video data having a second priority is converted into AC2 data and stored in the FIFO storage unit 38, and the audio data having the first priority. Converts to AC3 data and stores it in the FIFO storage 39.

In addition, the transmission scheduler 35 guarantees QoS by first sending high-priority data, and AC0 data, AC1 data, AC2 data, and AC3 data so that data of the same priority can be shared equally in a wireless channel. It performs a function to create a transmission schedule for the, and sequentially transmits the channel access signal of each data to the FIFO storage (36 ~ 39) in order accordingly.

The operation of the IEEE802.11e MAC unit 26 configured as described above will be described in more detail. PAL data of the IEEE802.11 MSDU frame structure input from the PAL unit 25 for IEEE802.11e is temporarily stored in the transmission queue 31. In addition, the transmission queue 31 receives the control and management transmission data from the transmission management unit 32 and then transfers the MSDU transmission data to the transmission protocol control unit 33.

At this time, the transmission management unit 32 generates control data such as a Power Save-Poll frame and management data such as an association request frame and transmits the generated management data to the transmission queue 31 to form MSDU transmission data.

Subsequently, the transmission protocol controller 33 receives the MSDU transmission data from the transmission queue 31, converts the MSDU transmission data into transmission protocol control data, and transfers the same to the access category mapping unit 34. In addition, the reception protocol control unit 42 receives the MSDU received data status signal of another wireless 1394 bridge, generates a Request To Send (RTS) frame, and the like, and transmits the same to the access category mapping unit 34. In addition, in order to guarantee QoS for the transmission protocol control data, a transmission scheduling control signal for distinguishing the priority of the transmission data is transmitted to the transmission scheduler 35.

Accordingly, the access category mapping unit 34 classifies the transmission protocol control data received from the transmission protocol control unit 33 by access category AC according to the user priority. At this time, the priority of the voice data is highest, and then the priority is set in the order of video data, best effort asynchronous data, and background asynchronous data. The effort asynchronous data is converted into AC1 data, the video data is converted into AC3 data, and the audio data is converted into AC4 data.

The AC0 to AC4 data are respectively input to the FIFO storage units 36 to 39. The FIFO storage units 36 to 39 are first-in first-out storage devices and output stored data in the order of input.

In addition, according to the transmission scheduling control signal sent from the transmission protocol control unit 33, the transmission scheduler 35 outputs high priority data first, so that the data of the same priority level can share the wireless channel fairly. A transmission schedule table for data, AC1 data, AC2 data, and AC3 data is created, and a channel connection signal is applied to the FIFO storage units 36 to 39, respectively, in accordance with the schedule table.

Each FIFO storage unit 36 to 39 is activated according to the channel access signal application, and outputs the first stored data to the MPDU generation unit 40.

Accordingly, the MPDU generation unit 40 generates a MAC header and a MAC trailer for AC0 transmission data, AC1 transmission data, AC2 transmission data, and AC3 transmission data sequentially received according to a transmission schedule. To MAC data in the form of an IEEE802.11 MPDU frame. The MAC data thus converted is transferred to the IEEE802.11a physical layer unit 27.

On the contrary, the MAC received data output from the IEEE802.11a physical layer unit 27 is input to the MAC receiver 41, and the MAC receiver 41 determines a frame address from the input MAC received data, and duplicates the frame. After detecting and performing a frame check sequence (FCS) test, the MSDU received data obtained by removing the MAC header and the MAC trailer is transmitted to the reception protocol controller 42.

As described above, the reception protocol control unit 42 that has received the MSDU received data is converted to the reception protocol control data and transferred to the reception queue 43, and, in addition, the CTS (Clear To Send) frame or ACK (Acknowledgementment) in the received data. ) Frame, the MSDU received data status signal is transmitted to the transmission protocol controller 33.

The reception queue 43 temporarily stores the reception protocol control data from the reception protocol control unit 42, and then divides the reception protocol control data into asynchronous data, real-time isochronous A / V data, control data and management data, and then asynchronous data. And real-time isochronous A / V data is converted into PAL received data in the form of IEEE802.11 MSDU frame and transmitted to the PAL unit 25 for IEEE802.11e, and the control and management received data is transmitted to the reception management unit 44. The reception manager 44 performs the reception management function of the IEEE802.11e MAC section 26 based on this.

FIG. 4 shows an IEEE802.11 MAC Service Data Unit (MSDU) frame structure in the form of PAL data exchanged between the IEEE802.11e PAL unit 25 and the IEEE802.11e MAC unit 26, and LLC (Logical) Link Control: Logical Link Control), SNAP (Sub Network Access Protocol), PAL header, and Sub-action data.

FIG. 5 shows a MAC protocol data unit (MPDU) frame structure, which is MAC data exchanged between the IEEE802.11e MAC unit 26 and the IEEE802.11a physical layer unit 27, and the IEEE802.11 shown in FIG. In the MSDU frame, a MAC header comprising frame control information, duration / ID, frame addresses (address 1, 2, 3, 4) and sequence control information, and a MAC trailer comprising FCS information. (trailer) is added.

Next, FIG. 6 illustrates a PPDU frame structure in the form of IEEE802.11a physical layer data exchanged between the IEEE802.11a physical layer unit 27 and the RF unit 28. The shown MPDU frame further includes a PLCP header and encoded OFDM data.

By the above operation, the wireless bridge device according to the present invention converts the IEEE1394 data input from the IEEE1394 device 11 into an IEEE802.11a wireless LAN signal and is transmitted to another bridge device or access point, and the other bridge device or access point. The IEEE 802.11a wireless LAN signal received from the point is converted into IEEE 1394 data and transmitted to the corresponding IEEE 1394 device, thereby enabling wireless communication according to the IEEE 802.11a / e standard between digital devices having an IEEE1394 port. High-speed wireless transmission and constant QoS guarantees.

As described above, the wireless bridge device according to the present invention is connected to the IEEE1394 port of a computer or digital device provided in a home or office, and converts the wired IEEE1394 data into IEEE802.11a / e wireless LAN data which guarantees QoS, and thus 5GHz. By providing a function of wireless transmission at a transmission rate of 6 to 54 Mbps in the band or receiving IEEE802.11a / e wireless LAN data and converting it into wired IEEE1394 data, a high-speed wired / wireless integrated network can be built. Furthermore, IEEE1394 By connecting the devices via a wireless LAN network to enable simultaneous transmission of isochronous data, it is possible to wirelessly transmit high-quality audio and video signals to all rooms in the home or office, and compared with the conventional IEEE802.11b wireless bridge device. Wireless transmission speed is 6 ~ 54Mbps, and it can guarantee QoS by using IEEE802.11e MAC. Excellent effect.

Claims (8)

An IEEE1394 matching unit connected to the IEEE1394 port for separating and outputting the IEEE1394 transmission signal into the bridge isochronous transmission data and the transaction asynchronous transmission data, and receiving and multiplexing the bridge isochronous reception data and the transaction asynchronous reception data to the IEEE1394 port; Receives IEEE802.11a wireless LAN reception signal, converts and outputs bridge isochronous received data and transactional asynchronous transmission data, receives bridged isochronous transmission data and transactional asynchronous transmission data, converts it into IEEE802.11a wireless LAN signal, and transmits An IEEE802.11a / e matching unit; It is connected between the IEEE 1394 matching unit and the IEEE 802.11a / e matching unit, generating or extracting a bridge packet for inserting or extracting information added in the bridge environment to the IEEE 1394 packet, and read and write for asynchronous data stream transmission And transaction routing for requesting and responding to lock processing and analyzing frame information of asynchronous data streams and isochronous data streams to set paths and transmission ranks to establish a plurality of IEEE1394 points and a single IEEE802.11a. a high performance serial bus bridge that performs wired and wireless bridge functions between / e points; And An IEEE1394 type wireless bridge device, comprising: a control unit for controlling the IEEE1394 matching function, the bridge function, and the IEEE802.11a / e matching function. The method of claim 1, wherein the IEEE 1394 matching unit  An IEEE1394 physical layer unit connected to the IEEE1394 port and transmitting and receiving an IEEE1394 signal; The transmission data input from the IEEE 1394 physical layer unit is separated into bridge isochronous transmission data and transactional asynchronous transmission data and output to a high performance serial bus bridge, and simultaneously inputted bridge isochronous reception data and transaction asynchronous reception data are multiplexed to the IEEE1394 physical layer. An IEEE1394 link layer unit for transferring to a unit; And An IEEE1394 type wireless bridge device, comprising: a first transaction unit connected to the high performance serial bus bridge to perform read, write, and lock processing of asynchronous data. The method of claim 1, wherein the IEEE802.11a / e matching unit A second transaction unit connected to the high performance serial bus bridge to read, write, and lock asynchronous data; A protocol adaptation layer (PAL) for IEEE802.11e that converts IEEE1394 transmission data from the high performance serial bus bridge into IEEE802.11e PAL transmission data, converts IEEE802.11e PAL reception data into IEEE1394 data, and applies it to a high performance serial bus bridge. part; An IEEE802.11e MAC unit for performing conversion between the IEEE802.11 PAL transmit / receive data and the IEEE802.11 MAC transmit / receive data input / output to the protocol adaptation layer unit; An IEEE802.11a physical layer unit connected to the IEEE802.11e MAC unit to perform conversion between IEEE802.11 MAC transmit / receive data and IEEE802.11a physical layer data; And And an RF unit for modulating and transmitting the transmitted data output from the IEEE802.11a physical layer unit into an RF signal of a 5 GHz band, demodulating the RF received signal into IEEE802.11a physical layer data, and transmitting the demodulated data to the IEEE802.11a physical layer unit. An IEEE 1394 type wireless bridge device, characterized in that formed. delete The method of claim 1, wherein the high performance serial bus bridge When the network structure changes, the bridge portals of interconnected serial buses cooperate with each other and update the network configuration, perform a Global Node ID configuration function, and perform the same cycle time on the bus. An IEEE1394 type wireless bridge device further comprising a cycle timer synchronizing function for providing a cycle time. The method of claim 3, wherein the IEEE802.11e MAC unit A transmission queue configured to receive PAL transmission data in the form of IEEE802.11 MSDU frames from the PAL unit for IEEE802.11e and to transmit MSDU transmission data to a transmission protocol control unit; A transmission manager which generates frame control data and frame management data and transmits the same to the transmission queue; Converts MSDU transmission data inputted from the transmission queue into transmission protocol control data, receives the MSDU received data status signal of another wireless 1394 bridge from the reception protocol control unit, generates a Request To Send (RTS) frame, and delivers it to the access category mapping unit. A transmission protocol control unit for outputting a transmission scheduler control signal according to a user priority; An access category mapping unit configured to receive the transmission protocol control data and output the classification by access category according to a user priority; A plurality of FIFO storage units for storing data for each of the access categories output from the access category mapping unit; A transmission scheduler for controlling a signal output of the plurality of FIFO storage units so that data is transmitted in priority order according to the transmission scheduler control signal; An MPDU generation unit for converting data for each access category sequentially input from the FIFO storage unit into MAC data and outputting the MAC data to the IEEE802.11a physical layer unit; A MAC receiving unit which receives MAC data of IEEE802.11a from the IEEE802.11a physical layer unit, extracts MDSU data, and delivers the MDSU data to a receiving protocol control unit; A reception protocol control unit which converts the MSDU received data input from the MAC receiver into reception protocol control data and transmits the received MSDU received data status signal to a transmission protocol control unit; A reception queue which receives the reception protocol control data of the reception protocol controller and separates the received protocol control data into asynchronous data, real-time isochronous A / V data, control data and management data; And An IEEE 1394 type wireless bridge device, characterized in that it comprises a reception management unit for receiving control and management reception data from the reception queue and managing reception of an IEEE802.11e MAC unit. The method of claim 3, wherein the IEEE802.11e MAC unit Performs Distributed Coordination Function (DCF) and Hybrid Coordination Function (HCF) access functions of Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA), sharing a wireless channel with other wireless 1394 bridge devices, and IEEE1394 The IEEE1394 type wireless bridge device, characterized in that the QoS is supported to transmit asynchronous data and real-time isochronous A / V data together. The method of claim 6, wherein the access category mapping unit The transmission data is divided into background asynchronous data, best effort asynchronous data, video data, and voice data in descending order of priority, and stored in a plurality of FIFO storage units, respectively. Type wireless bridge device.

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