Patent ID: 6275506
Filing Date: 2001-08-14
Classification: H04J,H04W

Abstract:
Radio transmission method for digital multimedia data signals between a plurality of subscriber stations, each having a transmitter and a receiver, in a local network, in particular an indoor network, using a mixed frequency and time division multiplex method FDMA (Frequency Division Multiple Access)/TDMA (Time Division Multiple Access), in which a relatively broad frequency band is divided according to the FDMA method into a plurality of carrier frequency ranges, namely the so-called main channels, and a plurality of time slots, namely the so-called sub-channels, distributed in a frame structure, are formed on each carrier frequency level according to the TDMA method, characterized in that a limited number of main channels, but at least one, is assigned to a grouping, that is to say a so-called cluster, of subscriber stations, in that a main channel signal is distributed between the one or more sub-channel signals which are associated with a cluster and which are transmitted using the TDMA method, in that each transmitter of an activated subscriber station transmits a detectable check signal, in its transmissions, and in that, on the basis of detection of this check signal in the respective receiver, other, newly activated subscriber stations determine the presence of transmit signals within a specific, spatially limited range, namely their own respective transmission range, and wherein in case a main channel for the cluster to which the checking subscriber station belongs has been detected, and this main channel has enough unoccupied transport capacity for the planned transmissions of the checking subscriber station, the corresponding time slot/s of the main channel are seized from the checking subscriber station, and wherein in the case that a main channel has not been detected for the cluster to which the checking subscriber station belongs, or in the case that the detected main channel cannot provide the required transport capacity for the planned transmissions of the checking subscriber station, a new, unoccupied main channel is seized by the checking subscriber station for the cluster.