Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-10-08
1999-08-17
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455 69, 455101, 455137, 455273, 455507, 455524, 375347, 375349, H04B 138
Patent
active
059407743
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to control systems for cellular, digital mobile communication systems.
In DE-OS 41 41 398 A1 (U.S. patent application Ser. No. 08/807,962 of Schmidt et al.) a process is described for improving the radio cell illumination in a cellular mobile radio system and a device for carrying out the process described. However, in this document no information is given on how the equipment for carrying out this process should be constituted.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and improved control system for distribution of signals from a base station controller between the base stations of a cell and for combining the signals received by several base stations into an aggregate signal.
The solution presented here to the control of the sending and receiving equipment installed in the radio base stations, the processing of the signals coming from this, and the processing of the signals going to it is characterized in that a cell controller (CC) has been provided for grid optimization of the cell parameters, which contains the new functions for signal processing and for controlling the radio equipment required by the radio cell illumination process used.
It is important that the control equipment be so constituted that as many existing components of conventional realizations as possible can be used further.
The equipment and functions will be described in the following using the GSM Standard for Mobile Communication as an example. The control installation described here is naturally not limited to this communication standard, but can be applied to all other cellular, digital mobile communication standards. The functions defined in the GSM Standard for radio transmission have been shown in FIG. 1, which is taken from GSM recommendation 05.01 (ETSI-GSM Technical Specification GSM 05.01. Physical Layer on the Radio Path: General Description. European Telecommunications Standards Institute, February 1992.)
The process according to DE-OS 41 41 398 A1 assumes that a cell is supplied not as previously by one transmitting and receiving installation but rather from several sides from the edge with the same signal in simultaneous broadcasting operation with directional antennas. With this concept with multiple communication in principle the same sites can be used as for conventional radio communication. In each base station several mutually overlapping sector antennas have been installed.
In the following the equipment and their functions are explained for the case in which each cell is simultaneously supplied by three base stations by sector antennas with an opening angle of 120 degrees, whereby the sector antennas of adjacent and mutually, partially overlapping cells overlap by 60 degrees.
However, the solutions presented can also be applied in the same way to other cases with a smaller or larger number of base stations per cell as well as other opening angles and overlap ranges.
FIG. 2 illustrates the multiple communication of a mobile station MS with three base stations BS.sub.1. . BS.sub.3 per cell. It is seen that the mobile station MS is here connected to the three base stations through three different radio connection paths d.sub.1. . d.sub.3. In the downlink, that is, in the radio direction from the base station to the mobile station, the signals sent by the base station BS.sub.1, are superimposed additively at the location of the mobile station MS. In the uplink, that is, in the radio direction from the mobile station to the base station, all three base stations BSi receive the signal sent by the mobile station MS. Because of the different connection paths with the respective distances d.sub.1 to d.sub.3, for the three paths different transmission times occur, which are essentially proportional to the respective distances d.sub.1. . d.sub.3. Over the three paths different propagation attenuations likewise occur, which to a first approximation are proportional to the d.sub.i ??, where ?? is the mean propag
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Papen Wolfgang
Schmidt Werner
Vary Peter
Zurbes Stefan
Chin Wellington
Detecon Deutsche Telepost Consulting GmbH
Nguyen Lee
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