Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1997-07-17
2001-04-17
Urban, Edward F. (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S025000, C455S462000, C343S757000
Reexamination Certificate
active
06219563
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is directed to a method for signal transmission in a communication system between a mobile radio and a base station. The invention is also directed to an apparatus for the implementation of this method.
The range in a wireless communication system, for example a cordless telephone, that is composed of a stationary and of a mobile radio transmission/reception means is defined essentially by its transmission power and its receiver sensitivity. The transmission power is thereby usually uniformly emitted in all directions, i.e. nearly spherically, in order, first, to be universally employable in every environment and, second, to achieve the same range in every direction. When, however, an individual is point in time is considered, then—from the point of view of the stationary radio transmission/reception means, i.e. of the base station of the cordless telephone in the example—only a fraction of the transmission energy is emitted in the direction of the mobile radio transmission/reception means, i.e. the mobile part of the cordless telephone in the example. The great majority of the transmission energy, by contrast, is not utilized and can even have an interfering effect on external devices.
A stationary radio transmission/reception means with a sharply bundling direction al antenna would be desirable that emits the available energy concentrated in precisely that direction in which the mobile radio transmission/reception means is situated at the moment. However, a not insubstantial outlay for locating the mobile means, i.e. the mobile part of a cordless telephone in the example, and for the exact alignment of the directional antenna would be required therefor.
SUMMARY OF THE INVENTION
An object of the invention is to create a considerably less involved possibility of improving the transmission behavior between the mobile and the stationary radio transmission/reception means of a telecommunication system, particularly of a cordless telephone.
In general terms the present invention is a method for signal transmission in a communication system between a mobile radio transmission/reception means provided with an antenna means, particularly the mobile part of a cordless telephone, and a stationary radio transmission/reception means likewise provided with an antenna means, particularly the base station of a cordless telephone. The radio area to be covered by the stationary radio transmission/reception means is illuminated by two or more directional antennas, each respectively covering a radio sub-area thereof. The directional antennas form the antenna means of the stationary radio transmission/reception means. In the fashion of antenna diversity, the directional antenna is activated in whose radio sub-area the mobile radio transmission/reception means is located.
The sum of the radio sub-areas covered by all directional antennas of the stationary radio transmission/reception means forms an at least approximately point-symmetrical radio area.
A manually implemented alignability of the directional antennas, so that the radio area they illuminate can be matched to the respectively existing environment, for example a building.
The selection of the directional antenna to be respectively activated is undertaken on the basis of comparative measurements of the reception field strength in the stationary radio transmission/reception means.
In general terms the present invention is also an apparatus for the implementation of the above-described method. The antenna means of the stationary radio transmission/reception means is equipped with two or more directional antennas, whereof each covers a radio sub-area of the radio area to be acquired by the stationary radio transmission/reception means. The directional antenna in whose radio sub-area the mobile radio transmission/reception means is located is respectively activated.
Advantageous developments of this embodiment of the present invention are as follows.
A direction adjustment means is provided for the directional antennas of the stationary radio transmission/reception means.
A measuring means with which the reception field strengths of the signals incident via the individual directional antennas and coming from a mobile radio transmission/reception means are measured is provided in the radio transmission/reception means. A comparison and selection means is provided that compares the reception field strengths and determines the highest thereof, so that the directional antenna at which the highest reception field strength is present is activated.
The directional antennas of the stationary radio transmission/reception means are formed by what are referred to as quick-heading beam antennas that are respectively composed of a vertical half-wave radiator with four parasitic elements that are arranged at the distance of 0.15&lgr;(&lgr;=wavelength) each from the half-wave radiator and whose lengths are switched such that they optionally act either as directors or as reflectors.
This form of antenna diversity, however, is to be distinguished from that utilized to combat fading effects and that is disclosed by German Utility Model 92 14 455. When the antenna diversity method fashioned according to the invention is implemented with directional antennas at the side of the stationary radio transmission/reception means of the system, then the employment of an anti-fading antenna diversity arrangement is not possible at the side of the stationary transmission/reception means, i.e., for example, at the side of the base station of a cordless telephone, unless each directional antenna were doubly implemented. The function of the known anti-fading antenna diversity, however, can be displaced into the mobile radio transmission/reception means of the system, i.e. into the mobile part of a cordless telephone in the example, or, respectively, this function can be limited to the mobile part.
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Euscher Christoph
Gapski Dietmar
Pillekamp Klaus-Dieter
Bell Boyd & Lloyd LLC
Siemens Aktiengesellschaft
Tran Congvan
Urban Edward F.
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