Siemens Aktiengesellschaft

Hermann-Josef Terglane

Uwe Sydon

Jurgen Kockmann

Juergen Kockmann

Anton Kruk

Peter Schliwa

Jürgen Kockmann

J&uuml;rgen Kockmann

The invention relates to a method and a device for digital data radiotransmission between a fixed station () and at least one mobile station () at one or several carrier frequencies (F, F. . . ), wherein the data is transmitted in several time slots (Z, Z. . . ) according to the time-multiplex technique. A specific amount of time is required to change from one carrier frequency to another carrier frequency using a slow-hopping HF module. The data is transmitted in an active followed by an inactive time slot during which no data is transmitted and which is sufficient for the HF module to program the frequency for the following active time slot. According to the invention, an inactive time slot is shorter than an active time slot.

Method and device for effective data radio transmission

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

According to the invention, a mobile radio is provided for radio transmission in time-division multiplex frames, where these frames each alternatively have active time slots (Z ) in which data are transmitted, and inactive time slots (Z ) in which no data are transmitted. The time duration of the active time slots is, in this case, twice the duration of the inactive time slots. The mobile radio ( ) has a burst mode controller ( ) which provides the time-division multiplex frame structure for transmission, and a clock preset device ( ), which presets the clock rate for the burst mode controller ( ). The clock rate which the clock device ( ) presets for the burst mode controller ( ) is twice as high during the inactive time slots (Z ) as during the active time slots (Z ).

Method, mobile station and base station for transmitting signals

The invention proposes a method and an apparatus for the radio transmission of user data, arranged in data words of a defined length, in time-division multiplex frames having active time slots in which data are transmitted and inactive time slots in which no data are transmitted. The user data are stored temporarily in a memory at a first data rate, and are read out from the memory and converted into the time-division multiplex frames at a second, greater data rate. During the time period from the beginning of an active time slot to the beginning of the subsequent active time slot, n (n&equals;a whole number &gE;1) data words of the user data are thereby respectively stored. By synchronizing the storing and the reading out of the user data, these data can be transmitted with the smallest possible delay in an arbitrarily selected time slot of the time-division multiplex frame.

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Heek, Germany

Hermann-Josef Terglane