Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-12-22
2000-05-02
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455560, 455524, H04Q 7155
Patent
active
060583177
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a base station of a radio system comprising: a central processing unit which includes control and maintenance means for controlling the base station in response to control signals transmitted from a base station controller, and at least one baseband frame unit for generating and supplying baseband signals further via a switching means alternatively to either of at least two radio channel units of the base station in response to telecommunication signals transmitted from the base station controller and for processing baseband signals transmitted from said radio channel unit and for supplying them further to the base station controller, and means for establishing a telecommunication connection with radio signals to radio units in the radio coverage area of the base station.
This invention primarily relates to variations in the capacity need of different parts of the geographical area covered by the cellular radio system. For example, in business centres considerably more traffic capacity is needed during daytime than in the evening. Correspondingly, the situation in suburban areas may be such that during daytime the capacity need is very small but in the evenings it becomes great when the residents return home from their places of work. If the capacity of the cellular radio system is dimensioned under these circumstances in accordance with the capacity need peaks, it will lead to a situation in which a considerable portion of the capacity of the system remains unused for the most part of the day.
2. Description of Related Art
Solutions are known previously in which calls of an adjacent cell are transmitted by using an antenna which can be temporarily directed thereto. In that case the coverage area of the adjacent cell cannot usually be completely covered.
Solutions are also known previously in which separate additional channel units are used by means of a relay-type of switchings, that is, the capacity of the additional channel unit shifts from one sector or cell to another in such a way that its antenna connection is changed by means of relay switchings. In this case, the geographical area on which capacity variation can be attained is very small as the RF signal from the antenna connection of the additional channel unit cannot be transferred very far e.g. by means of cables without the signal attenuation being significant in the cable. That means that for practical reasons, the alternative transmission antennas to which the additional channel unit can be switched should situate very close to one another.
SUMMARY OF THE INVENTION
The object of this invention is to solve the above problem and provide a base station of a radio system in which the available traffic capacity can be transferred between different geographical areas in a simple and uncomplicated way and in which the transfer distances may be significantly longer than in prior art solutions. This object is achieved with the base station of the radio system according to the invention that is characterized in that the base station comprises at least two radio set units arranged separately from one another of which at least one is arranged at a distance from the central processing unit, whereby said at least two radio channel units are arranged into different radio set units for transferring baseband signals transmitted from the frame unit to a predetermined radio channel and for forwarding radio frequency signals via antenna means of the radio set unit, and for transferring radio frequency signals received with the antenna means to the baseband and for supplying the baseband signals to the frame unit.
The invention is based on the idea that when at least two radio set units, arranged at a distance from one another and including radio units and antenna means, are connected to a base station, the traffic capacity of the base station can be distributed to a larger area than before because the frame unit in the central processing unit can be alternatively switched
REFERENCES:
patent: 4694484 (1987-09-01), Atkinson et al.
patent: 5084869 (1992-01-01), Russell
patent: 5121391 (1992-06-01), Paneth et al.
patent: 5752161 (1998-05-01), Jantti et al.
Gesesse Tilahun
Nokia Telecommunications Oy
Urban Edward F.
LandOfFree
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