Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1994-06-02
1997-01-28
Olms, Douglas W.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
455 541, 455 561, H04J 400
Patent
active
055984070
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a local area network (a LAN) and, more specifically, to a network of the cordless. (or wireless) type, to enable data to be communicated by radio between a plurality of user stations each comprising a respective data terminal, by means of a fixed central control device.
Local networks have become increasingly widespread in the informatics and telematics world for short-range connections for enabling the transmission and distribution of data and services between a plurality of users within the same area, for example, in the same building. A local network enables many data terminals of different kinds, such as personal computers (PCs), minicomputers, printers, etc. to be connected in an extremely flexible manner, enabling very fast transmission speeds of the order of hundreds of thousands of Kbits/sec.
Up to now, most local networks have been of the wired type, that is, of the type in which the connections between the user stations and the central control devices are formed entirely by wires.
The appearance on the market of portable computers such as laptop personal computers, has created a need for cordless LANs.
A cordless local area network reduces installation costs because it eliminates the need to install connecting cables. This type of network can also be formed in situations in which it would be difficult or impossible to install connecting wires, such as, in buildings which do not have sockets for LANs or in which there are architectural constraints.
A cordless LAN network may represent the ideal solution in an organisation in which the positions of the user stations or the number of stations connected in the network are subject to frequent changes or modifications.
A cordless LAN also represents the ideal solution for organisations which are subject to frequent changes of location. In this case, it would in fact be neither practical nor economical to transfer a wired LAN.
Finally, as stated above, a LAN network enables data to be communicated even by portable personal computers, without limiting the mobility of these new devices.
The network according to the invention operates particularly in accordance with the DECT (Digital European Cordless Telecommunications) standard developed by ETSI--the European Telecommunications Standards Institute--which defines the specifications for radio connections between users and a network in a private environment.
The DECT system operates in the band between 1880 MHz and 1900 MHz and provides for radio transmission by means of a hybrid time and frequency multiplex system.
The characteristics of the DECT standard are described, for example, in "Digital European Cordless Telecommunications Services and Facilities", ETSI DI/RES 3002, May 1991 and in "Data Services in DECT", A. Bud, Fifth International IEE Conference on Mobile Radio, Warwick, December 1989.
A cordless LAN employing radio to communicate between a plurality of user stations each comprising a respective data terminal, by means of a fixed central control device which controls communications between the data terminals in accordance with a predetermined communication standard, is disclosed in EP-A-0 257 947. In this known cordless LAN each data terminal is associated with a separate and distinct fixed radio transceiver and the central control device is connected to the fixed radio bases.
Network systems for transmitting data by radio signals between a head end unit and a plurality of work stations are disclosed in PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 229 (E-928), 4172, 15 May 1990 and JP-A-0260252.
The object of the invention is to provide a new and improved cordless radio local area network (LAN).
This object is achieved according to the invention with a cordless local area network having the features defined in the attached claim 1.
Typically, the data-terminals of the user stations may, for example, be personal computers and the microprocessor adaptor device is conveniently produced in the form of a "half-size"-format card or daughter board incorporated in the PC and
REFERENCES:
patent: 4425664 (1984-01-01), Sherman et al.
patent: 4665519 (1987-05-01), Kirchner et al.
patent: 5079628 (1992-01-01), Tomikawa
Patent Abstracts of Japan, vol. 14, No. 229 (copy not included with this IDS).
"Digital European Cordless Telecommnications Services and Facilities", ETSI DI/RES 3002 May 1991.
"Data Services in DECT", A Bud, Fifth International IEE Conference on Mobile Radio & Personal Communications, Dec. 1989.
Bud Andrew
Furno Rino
Olms Douglas W.
Sixtel S.p.A.
Ton Dang
LandOfFree
Cordless local area network having a fixed central control devic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cordless local area network having a fixed central control devic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cordless local area network having a fixed central control devic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-945837