Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-04-10
1997-07-15
Olms, Douglas W.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370362, 370375, H04B 726
Patent
active
056489625
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This application claims benefit of international application PCT/FI94/00207 filed May 25, 1994.
Field of the Invention
The invention relates to a base station for a cellular radio system comprising switching centres and base stations connected thereto through time-division telecommunication links, this base station comprising: transceiver units, a multiplexer/demultiplexer means for multiplexing the telecommunication links and for demultiplexing data to be sent from the base station to the telecommunication link and, a switching means for selectively switching the desired transceiver unit to the desired telecommunication link.
Background of the Invention
In typical cellular radio systems the switching centres, e.g. mobile services switching centres, are in contact with mobile phone subscribers through radio transmitters of base stations. Base stations can be connected to switching centres via base station controllers. A base station of the prior art comprises an antenna unit to which one or more transceiver units are connected, each of the transceiver units being connected via a multiplexer/demultiplexer means to a transmission channel of a telecommunication link and further, either directly or via a base station controller, to the switching centre of the cellular radio system.
A prior art solution is described in the publication EP 439 926, which discloses a base station of a radio communication system where the control unit of the base station can switch any radio unit through a bus to a digital interface circuit. The object of the cited reference is to provide a system which enables flexible handling of both analog and digital radio channel units in the same system. The problem with the solution according to the cited EP publication is that the base station disclosed therein is not capable of recovering from a situation where a fault has occurred in one of its transceiver units during normal operation. The solution disclosed does not possess a feature by means of which the operations and maintenance unit of the system would continuously receive fault information on the occurrence of faults in transceivers and could, on the basis of this fault information, switch the faulty transceiver unit off and, correspondingly, switch on a new, undamaged transceiver unit to replace the faulty one.
In the prior art solutions it has been impossible to replace a transceiver unit which transmits a certain transmission channel of a telecommunication link to the radio link and which is possibly faulty or requires maintenance with another, operative transceiver unit in a flexible manner and by remote control.
SUMMARY OF THE INVENTION
The object of the present invention is to obviate the above problems pertaining to the prior art and to provide a base station which flexibly both allocates and releases radio channels, and a cellular radio system.
This new type of base station for a cellular radio system is achieved with a cellular radio system according to the invention, which is characterized in that the switching means for the base station is a time slot switch comprising: a time slot counter for synchronizing the time slot switch with the time slots of the time-division bus, a time slot selection register responsive to operations and maintenance information including time slot selection data for time slot-specific storing and reading of the time slot selection data, a comparing means for comparing the time slot selection data contained in the time slot selection register with the state of the time slot counter at a given point of time in such a manner that the time slot selection data is compared with the state of the time slot counter and, responsive to the result of this comparison, the data contained in the time slot concerned on the telecommunication link or at the transceiver is transmitted forward, a buffer means responsive to the data supplied by the comparing means for storing data contained on the telecommunication link and for feeding the data into a transceiver unit, or for
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patent: 5420863 (1995-05-01), Taketsugu et al.
patent: 5425031 (1995-06-01), Otsuka
patent: 5535429 (1996-07-01), Bergenlid et al.
Nguyen Chau T.
Nokia Telecommunications Oy
Olms Douglas W.
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