JP2846393B2 - Multimedia wireless local area network system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multimedia wireless local area network system, and more particularly, to a multimedia system in a wireless LAN. For example, LAN (Local
Area networks), office automation, intelligent buildings, etc.

Conventional technology The standardization of multimedia LANs is currently underway.
There is a summary report in "Network LAN" (1989/1 P.98). Among them are IVD (Integrated Voice and Date) LAN,
It describes a multimedia integrated LAN such as FDDI (Fiber Distributed Date Interface) -II LAN.
On the other hand, regarding wireless LANs, products such as "Computer & Network LAN" (1987/5 P.23) are available. This is a wireless version of the RS-232C interface, which is low speed and only data transmission.

In a conventional local area network, various types of information are handled separately, and a telephone network, a data network, and another network are required. In addition, various terminals are connected to a network by a line, which takes time and trouble in tangent lines, and there is a drawback that the terminal cannot be moved freely.

The former measure is not LAN, but ISDN (Integrate
As in the case of a ted service digital network, there is a method of digitizing voice and data images and transmitting the digitized voice and data images over the same line. There is a wireless LAN as the latter measure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to provide a basic method for simultaneously realizing multimedia and wireless communication in a LAN. It is another object of the present invention to provide a multimedia wireless local area network system that enables a terminal to be moved, simplifies system expansion, and facilitates installation of a LAN.

Configuration In order to achieve the above object, the present invention provides (1) an image,
In the local area network system that transmits various information such as voice and data, the transmission information in the terminal-specific information format according to the type of information is modulated with the same noise code as the destination noise code and converted to a common transmission format A plurality of adapters for converting to wireless signals and transmitting and receiving the signals, and a transceiver on a network cable for transmitting and receiving wireless signals from the adapters. Is transmitted from the transceiver to each adapter again, and when each adapter demodulates the information with a noise code unique to each adapter and recognizes that it is information for itself based on the destination noise code, the terminal specific again. (2) performing an inverse conversion to the information format of (1) to perform storage and reproduction processing of transmission information; In over local area network method, without using a network cable, in which is characterized in that so as to transmit directly wirelessly transceivers each other and adapter between the space itself as a bus. Hereinafter, a description will be given based on examples of the present invention.

FIG. 1 is a configuration diagram for explaining an embodiment of a multimedia wireless local area network system according to the present invention, wherein 1 is a network cable, 2 and 3 are transceivers, 4 is an adapter, 5 is a TV, 6 is a PC, 7 is
FAX, 8 is a printer, 9 is a general-purpose computer, 10 is a telephone, and 11 is a stereo. In the present invention, information from all types of terminals and external lines is converted into one common transmission system using a dedicated adapter. The converted information is wirelessly transmitted from each adapter 4 to the transceivers 2 and 3 on the network cable 1. The transmitted information is transmitted again from another transceiver to the respective adapter 4 through the same transceiver or the network cable 1. When each adapter 4 confirms that the information is its own information, it converts the information back to a terminal-specific information format again, and performs processing such as storage and reproduction of the information.

FIG. 2 shows a configuration example in which no network cable is used. In FIG. 2, reference numeral 12 denotes an exchange, 14 denotes an adapter, 16 denotes a personal computer, 17 denotes a fax, 18 denotes a printer, and 20 denotes a telephone. It is designed for a small LAN such as in a single room. In this case, an exchange such as the exchange station shown in FIG. 1 may be provided, or the terminals may directly communicate with each other. The adapter according to the present invention may be a composite adapter that connects two or more terminals to one adapter at the same time.

FIG. 3 is a view showing another embodiment of the present invention.
Is a network bus, 32 and 33 are transceivers, 34 and 37 are adapters, 35 is an image scanner, 36 is a printer, and 38 is a filing device.

Here, CSMA / CD (Carrier Sense Multiple Access / C
Consider a multimedia LAN of the ollision detection (carrier detection multiple access / collision detection) system. here,
It is assumed that image data read by the image scanner 35 is transferred to the filing device 38. Network bus
Transceivers 32 and 33 on 31 always transmit radio signals, if any, on the bus, and upon receiving signal radio waves, demodulate them and transmit them on the bus. Each of the adapters 34 and 37 always receives signal radio waves from the transceivers 32 and 33. When transmitting image data from the image scanner 35, the adapter 34 receives radio waves from the transceiver 32 and checks whether the bus is free. When the space is confirmed, attach the transfer destination ID and send the data. Unless there is data collision in the middle, data transmission is continued to the end. Adapter 37 of filing device 38 on the receiving side is transceiver 33
And demodulates the signal radio wave from, and takes in the data to itself only when the ID attached to the demodulated signal matches its own ID. Thus, the data transfer ends. In this example, CSMA
/ CD method was used, but TDMA (Time Division Multiple Ac
cess; time division multiplexing), FDMA (Freguency Division Mul
A system using another system such as tiple access (frequency division multiplexing system) is also conceivable.

4 to 6 show specific examples of the configuration of a multimedia wireless LAN using a spread spectrum (SS) system. In this embodiment, code division multiplexing is performed by direct spreading.

FIG. 4 is an overall configuration diagram, in which 41 is a first transceiver, 42 is a second transceiver, 43 is a third transceiver, 44 is a first adapter, 45 is a personal computer, and 46 is a second adapter. , 47 are printers.

Data from the personal computer 45 is spectrum spread by the first adapter 44, and sent further to the first transceiver 41 is converted wave into the nearest center frequency f _1. First
The signal enters the transceiver 41 is transmitted to the transceiver through the SS bus cable, each transceiver transmits converts the signal on SS bus wave center frequency f _2. The second adapter 46 connected to the printer 47 always has the frequency f ₂
Of the nearest third transceiver
It receives the radio wave from 43 and extracts only the signal that matches its spreading code by despreading from this signal and demodulates the data from the personal computer 45. Then, the data is converted into data suitable for the printer 47 by the interface unit of the adapter 46 and a signal is sent to the printer 47. Thus, the data is sent from the personal computer 45 to the printer 47. The signal from the printer 47 is transmitted to the personal computer 45 in exactly the same manner. That is, the second
Sent from the adapter 46 to the third transceiver 43 at a frequency f _1, the frequency f ₂ which is transmitted to the first transceiver 41
To the first adapter 44. Use the frequency f ₁ from the terminal to the transceiver, use the frequency f ₂ is from the transceiver to the terminal. The transmitting and receiving antennas may be shared.

FIG. 5 is a diagram showing a configuration example of an adapter. In the figure, reference numeral 51 denotes a modulation unit, 52 denotes a demodulation unit, 53 denotes an interface unit, 54 denotes a control unit, 55 denotes a synchronization circuit, 56 denotes an oscillator (f ₁ ), 57 is a noise code generator, 58 is an oscillator (f ₂ ), 59 is an interface circuit, 60 is a control circuit, 61 is a correlator, 62 is a voltage control clock, 63 is a noise code generator, and 64 is a terminal.

The adapter is roughly composed of a modulation unit 51, a demodulation unit 52, an interface unit 53, and a control unit 54. The interface unit 53 converts a signal from a terminal 64 such as a personal computer into digital serial data, extracts control information, and
Send to When transmitting from the adapter, based on the signal from the terminal 64, the same code as the destination noise code is set in the modulation section 51, the oscillator 56 is turned on, and the spread signal is transmitted wirelessly. Demodulation unit
Usually, a noise code unique to each adapter is set in 52, and reception is always performed. The voltage control clock 62 and the noise code generator 63 in the figure are a synchronizing circuit 55 for demodulation. The signal is reproduced by extracting only the signal spread with the same noise code as the own from the signal from the transceiver, and sends it to the terminal 64 such as a printer through the interface circuit 59. As described above, each adapter connects each terminal to the transceiver by means of a bidirectional interface with a wireless transceiver. By preparing an interface section and a control circuit for each terminal, various adapters (PCs, printers, telephones, TVs, etc.) ) Can be connected.

FIG. 6 is a diagram showing a configuration example of a transceiver.
71 is an SS bus cable, 72 is a demodulation unit, 73 is a modulation unit, 74 is an oscillator (f ₁ ), and 75 is an oscillator (f ₂ ).

This converts the radio wave received from each adapter into a spread baseband signal and transmits it to the bus cable 71, and also converts the signal on the bus cable 71 into a radio wave and transmits it to each adapter.

In the above configuration example, an example using the SS method was shown, but in addition to this, the frequency division multiplexing method, the time division multiplexing method, the CSMA method such as Ethernet, etc. are applied, and an adapter conforming to each method is applied to each terminal. By adding, it is possible to build a system to share various data from various data terminals on the same LAN.

Effects As is clear from the above description, the present invention has the following effects.

(1) The function and effect corresponding to claim 1; the information transmission format on the network is unified into one, the dedicated information adapter is attached to various terminals, various information is converted into the same format, and the information is transmitted wirelessly. I do. Since the data is sent wirelessly from the adapter, if the terminal and the adapter are integrated, the terminal can be moved freely. When adding a new terminal, you can connect to the LAN simply by creating an adapter for that terminal. When installing a LAN, construction other than the main line is unnecessary, making it easy to install. If multiple terminals correspond to the adapter itself, the number of adapters will be reduced.

(2) Action and Effect Corresponding to Claim 2: In addition to the features described in Claim 1, wiring work is unnecessary because the trunk line itself is unnecessary. By allowing direct connection between the adapters, things like exchanges are no longer necessary.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a multimedia wireless local area network system according to the present invention, FIG. 2 is a configuration example in which a network cable is not used, and FIG. FIG. 4 shows another embodiment,
The figure is a block diagram of the multimedia wireless local area network system using the spread spectrum (SS) system.
The figure shows the configuration of the adapter, and FIG. 6 shows the configuration of the transceiver. 1 ... Network cable, 2,3 ... Transceiver,
4 ... Adapter, 5 ... TV, 6 ... PC, 7 ... FA
X, 8 ... Printer, 9 ... General-purpose computer, 10 ...
Phone, 11 ... stereo.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-222737 (JP, A) JP-A-63-114333 (JP, A) JP-A-1-190146 (JP, A) JP-A-1- 248837 (JP, A) JP-A-1-216634 (JP, A) JP-A-1-305636 (JP, A) JP-A-2-60252 (JP, A) JP-A-3-38133 (JP, A) 60-139359 (JP, U) Materials of the Institute of Electrical Engineers of Japan Communication Group CMN-88-7 pp. 57-66 IEEE VEHIC VLAR TE CHNOLOGY CONFERENCE E, Vol. 38th 1988, pp. 44- 51 (58) Field surveyed (Int.Cl. ⁶ , DB name) H04L 12/28 H04L 7/24 JICST file (JOIS)

Claims (2)

(57) [Claims] In a local area network system for transmitting various kinds of information such as images, sounds, data, etc., transmission information in a terminal-specific information format corresponding to the type of information is modulated with the same noise code as a destination noise code. A plurality of adapters that convert to a common transmission format, convert to wireless signals, and transmit and receive
And a transceiver on a network cable for transmitting and receiving wireless signals from the adapter, and the transmitted various information is transmitted from the other transceivers to the respective adapters again through the same transceiver or the network cable, and each adapter transmits the information. Is demodulated with a noise code unique to each adapter, and when it is recognized that the information is transmitted to itself based on the destination noise code, the data is inversely converted again into an information format unique to the terminal to store and reproduce transmission information. Multimedia wireless local area network system. 2. The local area network system according to claim 1, wherein the space itself is used as a bus and the transceivers and the adapters directly transmit wirelessly without using a network cable. Multimedia wireless local area network method.