JP4572107B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a microwave / millimeter wave ultrahigh-speed wireless communication system.

  In recent years, an ultra-high-speed bidirectional wireless communication system capable of transmitting multimedia data including moving images such as an IEEE 1394 compliant network has been realized. Such a system has advantages such as ultra-high speed data transmission of 400 Mbps and plug and play. A normal IEEE 1394 network is a connection using a cable. However, since the length of the cable is limited to 4.5 m and the connection between rooms is troublesome, a wireless connection is being studied.

  As a conventional wireless 1394, an adapter (adapter) having a repeater function with a wireless transmission speed of 500 Mbps in which broadband characteristics of millimeter waves of 60 GHz are used, the attributes of 1394 are inherited as they are, and a cable is replaced with a wireless link is known. In addition, as a higher speed, the Gigabit Ethernet (registered trademark) is being wirelessized. This also has the function of a media converter with a wireless transmission speed of 1.25 Gbps in which the cable is replaced with a wireless link. For related prior art, refer to Patent Document 1 below.

JP 2001-136138 A

  However, in the above-described prior art, as shown in FIG. 14, it is only possible to transmit a limited video source by point-to-point communication, and it is difficult to transmit various sources by point-to-multipoint communication. There was an inconvenience. For example, at exhibitions, it has been difficult to wirelessly transmit various high-definition video signals from a common parent radio to a plurality of large displays. As for the performance of the radio link, since both 1394 and Gigabit Ethernet (registered trademark) are full-duplex links, when using separate antennas for transmission and reception as shown in the figure, the side lobe of the antenna can be used in one radio. There was also a problem of receiving frequent errors due to reception of its own transmission wave. Here, 1 is the wireless 1394 adapter #A, 2 is also #B, 11 and 12 are the transmitter and receiver of adapter #A, 15 and 16 are the transmitter and receiver of adapter #B, and 13 is 1394 Is a long-distance PHY (physical layer circuit) that converts a cable link to a serial link suitable for wireless transmission. For example, a digital video camera (DVC) 14A as a 1394 device is connected to adapter #A, and 1394 is connected to adapter #B. A display 14B as a device is connected, and the video signal of the video camera is transmitted to the display and displayed. Reference numeral 17 denotes an antenna.

  In order to solve the above problems, the present invention employs means for solving the problems having the following characteristics.

  The invention described in claim 1 multiplexes and outputs a plurality of data sources, or divides and multiplexes the data sources, or outputs a multiplexed data source; and A master radio device connected to the data processing / output circuit, a plurality of slave radio devices, and a plurality of data terminals respectively connected to the plurality of slave radio devices; A plurality of data is attached with an identification code, multiplexed data transmitted from the parent radio apparatus is multiplexed by the data processing / output circuit, data of the selected identification code is extracted and processed. Features.

  The invention described in claim 2 is characterized in that the parent wireless device transmits data regardless of the presence or absence of a response signal from the child wireless device.

  The invention described in claim 3 is characterized in that the master radio apparatus includes only a transmitter and the slave radio apparatus includes only a receiver.

  The invention described in claim 4 is characterized in that the wireless link is bidirectional half-duplex, and the parent wireless device transmits data in response to a response from the child wireless device.

  The invention described in claim 5 includes a master wireless device to which a data source is connected and a data terminal connected to each of the plurality of slave wireless devices, and the master wireless device and the plurality of slave wireless devices. One of the selected child radio apparatuses includes a transmitter and a receiver, and the remaining child radio apparatuses include only a receiver, and a master radio apparatus and a selector radio apparatus including the transmitter and receiver; Bidirectional communication is performed, a plurality of data is multiplexed with an identification code, the multiplexed data is transmitted from a parent radio device, and is connected to each of the plurality of child radio devices and the plurality of child radio devices. Each of the received data terminals attaches an identification code to the plurality of data, receives the multiplexed data transmitted from the parent radio apparatus, extracts the data of the selected identification code, and processes it And

  The invention described in claim 6 is characterized in that the data communication system is based on IEEE1394.

  The invention described in claim 7 is that the multiplexed data has a stream header, and a data identification code is assigned to each of M (M is an integer of 1 or more) stream data by the stream header. Features.

  The invention described in claim 8 is set so that a communication link is always formed in a child radio apparatus having only the receiver by fixing SD (Signal Detect) at a signal reception issue level. It is characterized by.

  The invention described in claim 9 is characterized in that the data communication system is based on Ethernet (registered trademark).

  The invention described in claim 10 is characterized in that the multiplexed data has an RTP header, and the RTP header specifies an identification code of each real data.

  The invention described in claim 11 is characterized in that the plurality of child radio devices or data terminals form a network, and one selected device of the child radio devices controls the other.

  The invention described in claim 12 is characterized in that the antenna of the parent radio apparatus is a wide beam or a multi-beam.

  The invention described in claim 13 includes a data-side radio apparatus to which a data source is connected, and a plurality of terminal-side radio apparatuses, and the data-side radio apparatus includes a data transmitter and a command receiver. The selected one of the terminal-side wireless devices has a data receiver and a command transmitter, and the remaining terminal-side wireless devices have at least a data receiver, and the terminal-side wireless device Receiving multiplexed data transmitted from the data side radio apparatus multiplexed with an identification code added to the plurality of data, and extracting and processing data of the selected identification code among them. To do.

  The invention described in claim 14 includes a data-side radio apparatus to which a data source is connected, and a plurality of terminal-side radio apparatuses, and the data-side radio apparatus includes a data transmitter and a command transceiver. The selected one of the terminal side wireless devices has a data receiver and a command transceiver, and the remaining terminal side wireless devices have at least a data receiver. In the terminal side wireless device, A plurality of data is multiplexed with an identification code and multiplexed data transmitted from the data-side radio apparatus is received, and data of the selected identification code is extracted and processed.

  The invention described in claim 15 is characterized in that the data transmission mode is a broadcast type.

  The invention described in claim 16 is characterized in that the antenna of the data transmitter of the data side radio apparatus is a wide beam or a multi-beam.

  In the present invention, in an ultra high-speed wireless communication system using millimeter waves or the like, various data sources are multiplexed and transmitted from the parent wireless device with identification codes added thereto. A plurality of slave radio apparatuses having only a receiver can receive the multiplexed signal and demodulate a data source of a predetermined identification code and perform data processing such as video display. Therefore, it is possible to economically construct an ultrahigh-speed point-to-multipoint communication system, a multi-display display system, and the like. Further, since the selected child radio apparatus can be provided with a transmitter or a command radio, the application can be further expanded without impairing the economy.

FIG. 1 shows a configuration example of a radio communication system according to the first embodiment of the present invention. Video data of several DVCs: 14A1 to 14Am is taken in, for example, a PC as a data processing / output circuit 23, added with an ID, multiplexed, and placed on, for example, Gigabit Ethernet (registered trademark). The data is transmitted from the high-speed ASK transmitter TX1 through the Gigabit Ethernet (registered trademark) controller 24. Each of the wireless devices 1 to n: 22B1 to 22Bn uses receivers RX2 to RX _{n + 1} each having an ASK demodulator, and the video data of the ID selected from the received data is taken out by the controller and passed through the video card 25. Display 1-n: Displayed by 14C1-14Cn. However, since normal Gigabit Ethernet (registered trademark) is full-duplex bidirectional communication, only one child device can form a communication link with the parent wireless device, and is point-to-point communication. .

  In this embodiment, in order to realize multipoint communication, the parent wireless device is a broadcast type, the parent wireless device transmits data regardless of the presence or absence of a response signal from the child wireless device, and the child wireless device always receives. to continue. For this reason, in the configuration shown in FIG. 1, the master radio apparatus includes only a transmitter, and the slave radio apparatus includes only a receiver, so that an extremely economical system can be provided. Further, since the slave radio apparatus does not have a transmitter, the receiver does not receive a transmission wave that is an error signal output from the receiver apparatus. FIG. 2 shows a configuration example of a packet that realizes such broadcast-type communication. The packet includes a Datalink Header 51, an IP Header 52, a UDP Header 53, an RTP Header 54, and a Payload 55 through which actual data flows.

  In this configuration, a broadcast type is set by UDP / IP transfer, and an arbitrary receiver can receive data by using Multicast IP Address in IP Header 52. The ID of each data is specified by the RTP Header 54. Each child radio apparatus can extract desired data by designating Multicast IP Address and ID. In the configuration of FIG. 1, for example, desired data can be obtained by making these settings in advance in the controller. In order to change the data, the ID may be changed on the PC on the parent wireless device side.

  In this embodiment, the wireless transmission speed is as high as 1 Gbps or higher, and if DV format data (up to 100 Mbps is used), 9 channels can be transmitted together, and 3 × 3 multi-display data transmission is possible. If the base station antenna is a slightly wide beam antenna with a beam angle of about 20 ° (horizontally spread to 7 m at a distance of 20 m) or a 3-beam multi-beam antenna with a beam angle of 10 °, for example, four on the child side are arranged. A transmission range to a large PDP can be secured. There is also a method using side lobes instead of multi-beams. The child antenna is a narrow beam high gain antenna, which ensures a communication distance and prevents multipath. FIG. 3 shows an example of such a transmission and display system of multi video signals to the multi display. The parent radio apparatus 21 transmits four video contents 14A1 to 14A4 such as DVC, and the receivers 22B1 to 22B4. Reception, selective demodulation, and display with four PDPs 14C1 to 14C4.

  Since the slave wireless device groups are arranged side by side in the horizontal direction, it is preferable to use horizontal wide beam and vertical narrow beam antennas for the master wireless device. Such an antenna has a relatively high gain and can secure a communication distance, and can prevent communication due to reflection of radio waves on the floor and ceiling, thereby ensuring error-free communication. Each display video can be changed by changing the ID in the packet configuration as shown in FIG. Also, each video source can be rearranged arbitrarily, and one video source can be divided, so that the video displayed on the display can be arbitrarily replaced and synthesized. This system does not require complicated cable laying work at exhibitions and the like, and can be easily installed, resulting in a great economic effect. FIG. 4 shows an embodiment in which such control such as change of display content is performed on the slave radio apparatus side.

  The controller on the side of the slave wireless device is connected to the slave wireless device control circuit, for example, the PC 26 via a network, for example, Bluetooth, and the specification of Multicast IP Address and ID can be rewritten at any time by this circuit. In the embodiment of FIG. 4, the video source is supplied from a plurality of servers 1 to m: 14D1 to 14Dm. In this case, a different Multicast IP Address is assigned to each server.

  If the half-duplex communication mode of Gigabit Ethernet (registered trademark) is used, the master wireless device can also perform multipoint communication in which data is transmitted in response to a response from each child wireless device. An example of this configuration is shown in FIG. Here, all wireless devices have transmitters and receivers.

  FIG. 6 shows a configuration example of a radio communication system according to the second embodiment of the present invention. In this example, communication is performed based on 1394. Video data from 14A1 to 14Am is taken into, for example, a PC, IDs are added and multiplexed, and transmitted from, for example, a wireless 1394 adapter: 21A as a parent radio apparatus. Similarly, in each of the slave radio devices 22D1 to 22Dn, a signal is extracted through the 1394 PHY, and the video data of the selected ID is extracted and displayed on the display by the 1394 devices 14E1 to 14En having a selector.

  Since effective transmission of 320 Mbps is possible with 1394, if DV format data (up to 100 Mbps is used), three channels can be transmitted together. However, since a normal 1394 link is full-duplex bidirectional communication, only one child device can form a communication link with the parent wireless device, and is point-to-point communication. In this embodiment, in order to realize multipoint communication, the parent wireless device is a broadcast type, the parent wireless device transmits data regardless of the presence / absence of a response signal from the child wireless device, and the child wireless device always receives the data. . This state can be realized in IEEE 1394 by fixing SD (Signal Detect), which is a condition for forming a communication link, to High Level, which is a level at which a signal is received. FIG. 7 shows an example of a packet configuration for realizing such broadcast communication in 1394. The packet is composed of an isochronous header 61, a stream header 62, and a stream data group 63-65 through which actual data flows. A broadcast channel is set in the isochronous header 61, and an ID of each data is assigned in the stream header.

  FIG. 8 shows a configuration example of a wireless communication system according to the third embodiment of the present invention. A wireless Gigabit Ethernet (registered trademark) transceiver 21C having a server as a parent wireless device and a wireless Gigabit Ethernet (registered trademark) transceiver 22C1 as a selected child wireless device each have a transmitter and a receiver. Duplex communication is being performed. Along with the selected child radio device 22C1, wireless gigabit Ethernet (registered trademark) radio devices: 22C2 to 22Cn as subordinate child radio devices having only a receiver are provided. Video data with identification codes of several DVCs: 14A1 to 14Am are transmitted from the high-speed ASK transmitter TX1 of the master radio apparatus 21C.

Each slave device uses receivers RX2 to RX _{n + 1} each having an ASK demodulator, and the video data of the selected identification code is extracted and displayed. Subordinate child radio devices: 22C2 to 22Cn always operate in the reception mode. Since the parent wireless device 21 receives a response signal from only the selected child wireless device 22C1, a link as point-to-point communication is formed, and communication based on Gigabit Ethernet (registered trademark) becomes possible. . In addition, since the slave radio devices 22C2 to 22Cn do not require a millimeter wave transmitter, the cost of the system can be reduced. When the wireless transmission speed is as high as 1 Gbps or more, if DV format data (up to 100 Mbps is used), 9 channels can be transmitted together, and 3 × 3 multi-display data transmission is possible. If the base station antenna is a slightly wide beam antenna with a beam angle of about 20 ° (horizontally spread to 7 m at a distance of 20 m) or a 3-beam multi-beam antenna with a beam angle of 10 °, for example, four on the child side are arranged. A transmission range to the PDP can be secured. There is also a method using side lobes instead of multi-beams. The child antenna is a narrow beam high gain antenna, which ensures a communication distance and prevents multipath.

  An example of such a video transmission / display system is shown in FIG. In this example, 3 × 3 multi-displays: 14C1 to 14C9 are installed, and the selected child radio device 22C1 and child radio devices 22C2 to 22C9 are attached. The HDD device 14M in which a large number of video sources are stored is connected to the master wireless device 21C, from which video data is transmitted and displayed on the display. The parent wireless device has a server function, and each individual video source may be multiplexed and transmitted, or one high-definition video may be divided and transmitted, and synthesized and displayed on the display side. The latter can display high-definition video on a large screen. If 780 × 480 pixels of DV format data per display are displayed, a 2340 × 1440 ultra-high definition screen is obtained as a whole. This system does not require complicated cable laying work at exhibitions and the like, and can be easily installed, resulting in a great economic effect.

  FIG. 10 shows a configuration example of a radio communication system according to the fourth embodiment of the present invention. In the present embodiment, bidirectional communication via wireless 1394 is performed between the parent wireless device 21D and the selected child wireless device 22D1. In addition, a 1394 link with several 1394 data terminals, here DVC, is formed with the server 28 including a 1394 physical layer circuit with a normal cable connection, and this server is connected to an adapter 21D as a parent wireless device. Therefore, the number of DVCs that can be connected can be increased, and versatility is enhanced. The slave wireless device group forms a network around the PC to which the selected slave wireless device 22D1 is connected, and advanced video display control is possible by the PC.

  FIG. 11 shows a configuration example of a radio communication system according to the fifth embodiment of the present invention. The data-side radio device 31 includes, for example, an ASK transmitter TXa34 for sending ultra-high-speed data at 1 Gbps, a command receiving receiver RXa35 from the terminal side, and a control and data input / output circuit 36A. The device 32 has an ultra-high-speed data receiver RX1: 37, a command transmitter TXb38, and a control and data / command input / output circuit 36B. In addition to the selected terminal-side radio apparatus 32, the remaining terminal-side radio apparatuses 2 to h: 33B2 to 33Bh having only the ultrahigh-speed data receivers RX2 to RXh: 39B2 to 39Bh are provided. Video data with identification codes of several DVCs are captured by the data-side wireless device and transmitted from the data transmitter based on the reception command requested from the terminal-side device. Each terminal device uses a data receiver having an ASK demodulator, and the video data of the selected identification code is extracted and displayed. The selected terminal side device may not only send a request command to the data side wireless device but also control the remaining terminal side wireless devices. The control line 40 may be either wired or wireless. Since the command communication can be performed at a low speed, a low-priced transmitter / receiver can be used, and the ultra-high-speed data communication is unidirectional, so that the overall system price can be reduced. For example, a millimeter-wave 60 GHz band may be used for ultrahigh-speed data communication, and a 2.4 GHz band may be used for command communication. When the wireless transmission speed for data is 1 Gbps, if the DV format data (up to 100 Mbps is used), 9 channels can be transmitted together, and data transmission for 3 × 3 multi-displays is possible. If a slightly wide beam antenna with a beam angle of about 20 ° (horizontally spread to 7 m at a distance of 20 m) or a multi-beam antenna with 3 beams at a beam angle of 10 ° is used as the transmission antenna of the data side radio apparatus, for example, the terminal side The transmission range to the four PDPs arranged side by side can be secured. There is also a method using side lobes instead of multi-beams. The receiving antenna of the terminal side device is a narrow beam high gain antenna, ensuring a communication distance and preventing multipath.

  FIG. 12 shows a configuration example of a radio communication system according to the sixth embodiment of the present invention. In place of the unidirectional radio for command from the selected terminal side radio apparatus to the data side radio apparatus in the embodiment of FIG. 11, radio units TRXa41 (data side) and TRXb42 (terminal side) each having a transmitter / receiver ). In this case, it is possible to send a command from the data-side wireless device to the terminal device for control, and versatility is enhanced. Data terminal device groups other than the selected terminal-side radio device 32C: 33C2 to 33Cp may include only data receiving receivers: RX2 to RXp, and command radios TRXb2 to TRXbp as shown in FIG. It may be provided. If, for example, Bluetooth is used for the command radio, the cost can be reduced. In this example, the data-side wireless device 31A has a built-in server 43, and is connected to the Gigabit Ethernet (registered trademark) controller (GEC) A: 43A for super-high-speed data transmission and the backbone network 44 (registered trademark). ) Controller (GEC) B: 43B and HDD 43C for data storage. Therefore, the multi-data on the data device side can be updated at any time and further increased. Further, the data terminal side can inquire about the contents of the content and request transmission of the desired content.

  FIG. 13 shows an example of a hot spot to which such an ultrahigh-speed data transmission system is applied. For example, the data-side wireless device 31A is installed on the ceiling. This is connected to the backbone network by a Gigabit Ethernet (registered trademark) cable 44. This data transmitter has a circular wide-angle beam antenna, for example, a beam half-width of 60 °, and can transmit data at an ultrahigh speed of 1 Gbps in a wide area below. Below, for example, a wireless device 51A equipped with a receiver for ultra high-speed data and a wireless device for command, a kiosk terminal 51 capable of selecting and displaying video content, a personal computer such as a PC or PDA equipped with the same wireless device Data terminals 52 to 54 are provided. Each data terminal uses the command radio to inquire about the content of the data in the data-side wireless device, and issues a request for downloading the required content. Based on the request, the server in the data-side wireless device adds a predetermined ID to this content and sends it from the transmitter for ultrahigh-speed data. The data terminal extracts the content with a predetermined ID from the received data, and performs processing such as storage and display. If the data transmission is broadcast type and the command radio is ad hoc type, the data terminal can freely enter and leave this spot. In this system, a point-to-multipoint gigabit hot spot system can be economically constructed by using a unidirectional radio of Gbps class for data communication requiring ultra-high speed and applying a wide-angle beam antenna.

It is the figure which showed the structure of the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is the figure which showed the structure of the packet which implement | achieves broadcast type communication in the system of FIG. It is the figure which showed the example of transmission of the multi video signal to the multi display in the system of FIG. 1, and a display system. It is the figure which showed embodiment which performs control, such as a change of a display content, on a sub radio | wireless apparatus side. FIG. 5 is a diagram illustrating a configuration in which the wireless device includes a transmitter and a receiver in the system of FIG. 4. It is the figure which showed the structure of the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is the figure which showed the structure of the packet which implement | achieves broadcast type communication in the system of FIG. It is the figure which showed the structure of the radio | wireless communications system which concerns on the 3rd Embodiment of this invention. It is the figure which showed the example of transmission of the multi video signal to a multi display, and the display system in the system of FIG. It is the figure which showed the structure of the radio | wireless communications system which concerns on the 4th Embodiment of this invention. It is the figure which showed the structure of the radio | wireless communications system which concerns on the 5th Embodiment of this invention. It is the figure which showed the structure of the radio | wireless communications system which concerns on the 6th Embodiment of this invention. It is the figure which showed the example of the hot spot which applied the ultrahigh-speed data transmission system. It is the figure which showed the structure of the conventional ultrahigh-speed bidirectional | two-way radio | wireless communications system.

Explanation of symbols

1 Wireless 1394 adapter #A
2 Wireless 1394 adapter #B
11, 15 Transmitter 12, 16 Receiver 13 1394 Long distance PHY (physical layer circuit)
14A, 14A1-14Am 1394 equipment (video camera)
14B, 14C1-14Cn, 14E1-14En Display 14D1-14Dm Server 17 Antenna 21, 21A, 21B, 21C, 21D Parent wireless device 22C1, 22D1 Selector wireless device 22B1-22Bn, 22C2-22Cn, 22D1-22Dn: Child wireless device 23 Data processing / output circuit 24 Gigabit Ethernet (registered trademark) controller 25 Video card 26 Child wireless device control circuit 31, 31A Data side wireless device 32, 32C Selected terminal side wireless device 33B2-33Bl Terminal side wireless device 33C2-33Cp Data terminal 34 Data Transmitter 35 Command Receiver 36A, 36B Control Input / Output Circuits 37, 39B2-39Bh Data Receiver 38 Command Transmitter 40 Control Network 41, 42 Command Radio 43 Over bus 43A, 43B Gigabit Ethernet (registered trademark) controller 43C HDD
44 Backbone network 51 Kiosk terminal 51A Terminal side wireless device 52-54 Personal data terminal TX1, TX2 Transmitter RX1-RX _{n + 1} receiver TXa Data transmitter TXb Command transmitter RXa Command receiver TRXa, TRXb Command radio Machine

Claims (5)

Multiplexed data in which multiple data are multiplexed so that they can be identified by an identification code, and multiple data sources are multiplexed, or data sources are divided and multiplexed or multiplexed. A data processing / output circuit for outputting data;
A parent radio apparatus that converts multiplexed data supplied from the data processing / output circuit into a radio signal and outputs the radio signal ;
A plurality of child radio devices having a plurality of data processing circuits for demodulating a radio signal received by radio connection with the parent radio device and separating corresponding data from multiplexed data according to an identification code ;
A plurality of data terminals connected to each child radio device and processing the separated data ;
The plurality of child radio devices or data terminals form a network, and a selected one of the plurality of child radio devices controls another child radio device or a selected one of the data terminals is another A wireless communication system for controlling the data terminal . A data-side wireless device to which the data source is connected;
  A plurality of terminal side wireless devices,
  The data-side radio device includes a data transmitter and a command low-speed receiver,
  A selected one of the terminal-side wireless devices has a data receiver and a command low-speed transmitter, and the remaining terminal-side wireless devices have at least a data receiver,
The data transmitter of the data side wireless device and the data receivers of the plurality of terminal side wireless devices are changed from the data transmitter of the data side wireless device to the data receivers of the plurality of terminal side wireless devices. For point-to-multipoint high-speed wireless communication,
The command low-speed transmitter of the selected one device in the terminal-side wireless device and the command low-speed receiver of the data-side wireless device are for the command of the selected one device in the terminal-side wireless device. Perform point-to-point low-speed wireless communication from the low-speed transmitter to the command low-speed receiver of the data side wireless device,
  The terminal-side wireless device receives multiplexed data transmitted from the data-side wireless device multiplexed with an identification code added to a plurality of data, takes out data of the selected identification code, and processes it A wireless communication system. The data side wireless device further includes a command low speed transmitter,
The selected one of the terminal side wireless devices further includes a command low speed receiver,
The point-to-point low-speed wireless communication is performed from the command low-speed transmitter of the data-side wireless device to the command low-speed receiver of one selected device in the terminal-side wireless device. Wireless communication system. 4. The wireless communication system according to claim 2, wherein the data transmission mode is a broadcast type. 5. The radio communication system according to claim 2, 3 or 4, wherein the antenna of the data transmitter of the data side radio apparatus is a wide beam or a multi beam.

Images