Siemens Aktiengesellschaft

Jürgen Kockmann

Uwe Sydon

Olaf Dicker

Hermann-Josef Terglane

A method and system for the wire-free transmission of data between a mobile unit and a fixed station in time slots on one of a number of carrier frequencies with fixed station and the mobile unit each respectively include both a device for outputting a predetermined sequence which prescribes the carrier frequencies of the time slots, the carrier frequencies of two successive time slots being different, and an RF module for transmitting the data in time slots, the carrier frequencies of the time slots each being prescribed by the predetermined frequency of the output device.

Method and system for logging on a mobile unit at a fixed station

The present invention relates to a radio inter-face for a cordless small system using the 2.4 GHz ISM band. According to the present invention, a transmission system having a fixed station () and at least one mobile station () is provided for this purpose, the fixed station () and the mobile station () each having devices (RF modules) in order to transmit the data in time slots using a frequency-division multiplex method (FDMA) and a time-division multiplex method (TDMA), and with time division duplexing (TDD). As is known from DECT Standard, the data are modulated onto a carrier frequency (f) using a GMSK modulation method. The RF modules () in the fixed station () and, respectively, the mobile station () are in this case designed such that the carrier frequency (f) is changed after a predetermined time period, which may correspond, for example, to the time duration of a time slot or of a transmission frame. A transmission frame in this case contains 16 time slots.

Radio interface for a small wireless installation in the 2.4 GHZ ISM band

A method and an apparatus transmits information in various carrier frequencies with frequency hopping. A tablewith a plurality of n possible carrier frequency values fx in addressesthrough N of the tableis thereby offered. Further, a sequence of random values is generated, for example in a random number generator, on the basis whereof a part M of the N carrier frequency values fx is read from the corresponding addresses of the table, whereby M&#x2266;N applies. Information is subsequently transmitted in the corresponding carrier frequencies. The inventive apparatus or, respectively, the inventive method can be implemented, for example, in a mobile station and/or a base station of a mobile radiotelephone system.

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Gronau, Germany

Jürgen Kockmann