U.S. Philips Corporation

Bernhard J Ruber

Dietmar W Kunz

Jesus-Manuel Duque-Anton

Jesus M Duque-Anton

Meinhard D Ullrich

In speech recognition, a reliability measure can be determined by using various sentence hypotheses with a decreasing acoustic similarity. However, if a databank inquiry is to be derived from such a speech signal, often only individual words or even a single word from the utterance are required as data for such a databank access. Such a data, for example, the time, may be contained in the speech utterance in various ways. In accordance with the invention, a reliability measure for such a data rather than for a given word is determined, in which the same data may be constituted by various words. Thus, these various words are treated equally for determining the reliability measure.

Method of determining a reliability measure

Mobile radio transmission system with channel allocation, utilizing the

A spread-spectrum based cellular mobile radio system resolves average mutual interferences (I.sup.u (j).sub.av, I.sup.d (j).sub.av) between radio zones j, j') from a total interference experienced in a radio zone (j), using statistical methods. First, interference measurements are carried out in the radio zones (Z1, Z2), and data is transmitted to a central control arrangement (CA) which resolves the average mutual interferences. Then, these average mutual interference (I.sup.u (j).sub.av, I.sup.d (j).sub.av) are used in an optimization process for acquiring access control parameters (x) for controlling traffic per radio zone (Z1, Z2). In the optimizing process various objective functions may be applied so as to fulfil system operator demands. Thus, system overload is avoided, and further, a flexible tool is provided for satisfying operator demands.

Spread-spectrum based cellular mobile radio system, and a control

A cellular mobile radio systems includes fixed stations and mobile stations, a radio cell being subdivided into sub-cells and each sub-cell being assigned its own allocation of radio channels. The values of radio parameters of the fixed stations are measured and evaluated for assigning a mobile station to a sub-cell. To achieve an additional increase of the radio channel capacity of such system, a position vector is assigned to each respective mobile station which is derived from the measured parameters. A mobile station is then assigned to a specific sub-cell on the basis of its position vector.

Cellular mobile radio system comprising sub-cells

In a cellular mobile radio network a limited number of available channels must be allocated among the various cells, and the efficiency of such allocation is highly variable with changing traffic conditions in the network. To solve this problem the invention determines all possible radio situations which may arise in the network, including the radio positions of a mobile station and occupancy of the various channels. The individual components of each possible radio situation are then compared with predetermined thresholds so as to reduce the multiplicity of such situations to a relatively small number of classified radio situations each of which has its own channel list allocated thereto. When a channel is requested for a mobile station, the relevant classified radio situation is determined and channel assignment is made from the channel list applicable to that classified situation.

Cellular mobile radio system utilizing predetermined channel lists

A mobile radio system includes fixed stations and mobile stations, a free channel for establishing connection to a mobile station being selected from a predetermined channel list for each fixed station. The individual station lists are initially assigned in a radio network planning phase. To adjust to changes in the system which only occur after it is in operation, the assignment of radio channels is modified on the basis of measured data obtained during actual operation of the system. In this way the system becomes self-adaptative.

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Roetgen, Germany

Bernhard J Ruber