Multiplex communications – Communication over free space – Repeater
Patent
1996-11-22
1999-08-24
Vu, Huy D.
Multiplex communications
Communication over free space
Repeater
455 7, H04B 714, H04J 110
Patent
active
059433230
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for repeaters in radio-based communications systems, for example systems of the DECT limited-area mobile access type, where a function or functions for identification and initiation is or are available for each respective repeater.
PRIOR ART
EP 497 490 relates to a cordless telecommunications system which is able to configure automatically the terminals included in the system. During installation, the base units are set out at random, after which an automatic configuration can take place by means of a simple press-button procedure. Some of the units can function as repeaters for other units. During communication (via such a repeater, for example), a transmission protocol consisting of transmission frames is used. At the start of each frame there is information for initiating the terminals with the aid of a synchronizing segment. At the start of the frame there is also the possibility of transmitting the identity of the system in order to check that the stations are communicating on the right system. Additional information which can be transmitted in the frame is information on which carrier frequency in to be used.
EP 515 029 describes a communications system which uses TDM. The system consists of a master station, a number of repeaters and slave stations. The master station can communicate with any one of the slave stations. During communication with the repeaters, a repeater number can be added to the synchronization information.
U.S. Pat. No. 4,230,989 shows a communications system with repeaters. The system consists of a central interrogating station and a number of remote stations. These stations can be identified by a unique address. If a first station cannot communicate directly with the central station, a second station in the vicinity can function as a repeater. A message addressed to the first station is then relayed onwards to the first station by the second station.
U.S. Pat. No. 5,200,955 describes a repeater which in intended to be used in a mobile radio system which employs TDMA. The repeater can identify which channels are active and can amplify these. However, the repeater cannot identify the channel or its user.
DESCRIPTION OF THE INVENTION
Repeaters in radio-based communications systems can be extremely important, in many applications, for the economy and functionality of the system. An example of a powerful repeater application is the radio-based local network application called limited-area mobile access. The application involves the terminating wire connection to the subscriber being replaced by or supplemented by radio covering the area. The subscriber is offered terminal mobility within one or more limited areas. In this application, if repeaters are used, the number of base units can be reduced by a factor of 10-100, for which reason the cost of, among other things, wire connection of the base units falls dramatically.
The potential importance of repeaters is further reinforced by the fast-growing worldwide interest within the sector.
Regardless of which repeater principle is used, certain common technical problems may occur, and these must be solved if it is to be possible to use repeaters successfully. The main object of the present invention is to propose an arrangement which solves these problems.
It is also important that the ideas lying behind the invention can be implemented in existing systems so that these can be used effectively and without the system capacity dropping. The invention also solves this problem.
In this connection there is therefore a need to propose novel repeater principles. A further technical problem in this connection is to propose a novel signalling procedure.
The feature which can principally be regarded as characterizing the novel arrangement is that the said functions of identification and initiation for each repeater can be effected without the need for digital decoding in the respective repeater concerned.
Embodiments of the inventive concept involve identification of the opera
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patent: 5365590 (1994-11-01), Brame
Olanders Peter
Wickman Johan
Lee Chiho Andrew
Telia AB
Vu Huy D.
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