Abstract: A system for locating a mobile terminal, in particular for rescuing a person in distress equipped with the said mobile terminal. The mobile terminal is of a type able to communicate via the base stations of at least one radio-communication system. The system comprises: at least a device for alerting the mobile terminal, transported by an aircraft and comprising a repeater connected to the first and second antennae, the said first antenna enabling the repeater to communicate with one of the base stations, the said second antenna enabling the repeater to create a specific, limited radio-communication coverage zone, located close to the aircraft, and to communicate with the mobile terminal, if the latter is located in the coverage zone, in such a way as to alert the mobile terminal and to force it to transmit at least a first message; means for locating the mobile terminal based on the said first message transmitted by the mobile terminal.

Abstract: The invention concerns a method for optimising the access to an Internet type network (130) by means of a cellular radio-communication network (109) presenting different types of interface that may be observed (100, 103, 105, 107, 1010, 131), the method comprising:

Abstract: A system for locating a mobile terminal, in particular for rescuing a person in distress equipped with the said mobile terminal. The mobile terminal is of a type able to communicate via the base stations of at least one radio-communication system. The system comprises: at least a device for alerting the mobile terminal, transported by an aircraft and comprising a repeater connected to the first and second antennae, the said first antenna enabling the repeater to communicate with one of the base stations, the said second antenna enabling the repeater to create a specific, limited radio-communication coverage zone, located close to the aircraft, and to communicate with the mobile terminal, if the latter is located in the coverage zone, in such a way as to alert the mobile terminal and to force it to transmit at least a first message; means for locating the mobile terminal based on the said first message transmitted by the mobile terminal.

Abstract: A method and device for the testing of a radiocommunications network by implementing downline from a first antenna and a second antenna, respectively a first reception line and a second reception line. The first reception line is assigned to the reception of first signals, in a first incoming direction. A second reception line is assigned to the reception of second signals, in a second incoming direction. Each reception line tries to decode the signals that it receives and, if the decoding can be done, it reads an identifier proper to the transmitter, so as to determine firstly which of said first and second signals are interference signals, and, secondly, the incoming direction of interference signals and/or the identifier of interference units. The disclosure also relates to a corresponding base station.

Abstract: A mobile radiocommunication terminal includes a first antenna with a first polarization and a second antenna with a second polarization. The antennas are separate and are both used to receive signals. Signals received by the first and second antennas are combined in polarization diversity. Specifically, for each distinct polarization, a Viterbi decoding means outputs the most probable signals and a probability factor associated with the most probable signals. A digital signal processor includes, for each distinct polarization, weighting means that weight the most probable signals by the associated probability factor, and means for summating the signal outputs from the weighting means.

Abstract: The invention relates to a process for calculating the position of a mobile station (MS) belonging to a cellular radiocommunication system, starting from an identifier of a current geographic cell in which the said mobile station is located. The process according to the invention includes the following steps: calculate a modelled geographic representation (5) of the current cell; calculate the barycenter (6) of the said modelled geographic representation of the current cell; calculate an uncertainty area (7), with a predetermined geometric shape, centerd on the said barycenter and the area of which is approximately equal to the area of the said modelled geographic representation of the current cell. The position of the mobile station is defined by the said barycenter, with an uncertainty equal to the said uncertainty area.

Abstract: A system and method control a cellular radiocommunications network, in particular according to the GSM standard. The system of control includes fixed means for the recording and time-stamping of signalling information travelling through at least one interface among the various types of interfaces capable of being observed (such as, in particular, the Abis, A, "CCITT signalling system No. 7" and MAP interfaces); fixed means for the centralization of the recorded and time-stamped signalling data; means for the association of localization information with said signalling information so as to precisely localize segments of said cellular network located downline from each interface on which signalling information is recorded.