Abstract: There are proposed a method for determining timing differences between a plurality of radio transmitters (BTS) and a radio network incorporating the method. Timing information of signals received by measuring means from said plurality of radio transmitters (BTS) is determined. The timing differences between said plurality of radio transmitters (BTS) are determined on the basis of said timing information determined by said measuring means and the respective distance differences between said plurality of radio transmitters (BTS) and said measuring means. This method can be advantageously applied to locating mobile stations in a mobile radio network.

Abstract: The invention relates to a locating method and an arrangement for determining the location of a terminal in a radio system comprising a plurality of base stations and terminals. At least two base stations with known locations transmit a signal used in locating the terminal, and the signals are transmitted in beams with directional antenna patterns and the direction of the beams is changed as a function of time. The terminal determines the location of the base station and the transmission direction of the signal used in location determination by means of the beam transmitted by said at least two base stations. Since the terminal is located at the intersection of the beams of the base stations transmitting from known locations, the location of the terminal can easily be determined. The solution takes multipath propagation into account.

Abstract: Apparatus, and an associated method, for facilitating synchronization of the operational codec modes of communication stations which communicate pursuant to a communication session. Signaling is provided to indicate allowed AMR (adaptive multi rate) codec modes to optimize speech connections in a GSM/EDGE radio access network (GERAN). RTP messages are defined, such as defining new message types or new field extensions in RTP messages to identify the codec modes.

Abstract: The invention relates to a method for locating a mobile station (5) my means of radio signals between the mobile station (5) and the mobile station network (1a, 2a, 3a, 4a) by forming separate location channels in addition to the communication channels. The location channels are, among others, the location access channel and the location receipt channel. The access channel is used to send a burst, which includes the identification of the mobile station (5), such as the International Mobile Subscriber Identification (IMSI). The location channels can be used in the locating methods based on the angle of arrival, time difference and transition time of the radio transmission, for example.

Abstract: A method and system for estimating the location of a mobile station in a cellular radio network having a reference base station and a plurality of neighboring base stations capable of communicating with the mobile station. At the beginning of the E-OTD measurements, the mobile station may be provided with the expected OTD values in the reference base station site, possibly instead of RTD values of the neighboring base stations, in order to make it possible for the mobile station can calculate the uncertainty in the measured OTD due to the unknown location of the mobile station. In an alternative scenario the network provides the mobile station the expected OTD values in the current location of the mobile station, and the estimated uncertainty of those values. When the uncertainty is greater than a predetermined value, the mobile station makes the E-OTD measurements based on the SCH bursts.

Abstract: A cellular radio network based positioning system for determining the position of a mobile station (16). For each base transceiver station (1 to 5) or cell of the network, a fixed list of base transceiver stations is stored by a Mobile Positioning Centre (13). Each list identifies those base transceiver stations which enable the position of a mobile station served by the corresponding base transceiver station (6) to be optimally determined. The list is transmitted to the mobile station (16) via the serving base transceiver station (6) and the mobile station determines an observed time difference for each of the listed base transceiver stations, relative to the serving base transceiver station (6), from signals broadcast by the listed base transceiver stations. The observed time differences are transmitted from the mobile station (6) to the serving base transceiver station (6) and are used by the network to compute the position of the mobile station (16).

Abstract: A phased array antenna in space receives a beacon signal from an earth based beacon station at each of a plurality of antenna elements which make up the array. The beacon signal is passed to a beacon signal processor which determines the phase differences between the signal received at different antenna elements. The phase differences provide a measure of the physical displacement of the antenna elements from their nominal relative positions, due to distortion of the antenna structure resulting from, for example, gravitational forces. To correct for the effect of the displacement, phase compensation signals are generated corresponding to the phase differences and are applied to the communication signals being transmitted from and received at the antenna elements.

Abstract: The invention relates to a method for locating a mobile station (5) my means of radio signals between the mobile station (5) and the mobile station network (1a, 2a, 3a, 4a) by forming separate location channels in addition to the communication channels. The location channels are, among others, the location access channel and the location receipt channel. The access channel is used to send a burst, which includes the identification of the mobile station (5), such as the International Mobile Subscriber Identification (IMSI). The location channels can be used in the locating methods based on the angle of arrival, time difference and transition time of the radio transmission, for example.

Abstract: The invention relates to a method for locating a mobile station (1) by means of the mobile station (1) and a location service center (LSC) (5) in the mobile network by dynamically distributing the computing between these two. Preferably the mobile station (1) measures impulse responses of received bursts to determine time differences, and preprocesses measurement results. The location service center (5) performs the final processing. According to the invention, dummy bursts are also used in the locating process. The method also includes an automatic locating procedure activated in conjunction with an emergency call.

Abstract: The invention relates to a method for determining the position of a mobile station, a positioning system and a mobile station. According to the invention, a mobile station (21) receives signals from at least two base stations (22, 23, 24) and determines time differences of the clocks of the received signals. The mobile station (21) sends information about the time differences to a positioning service center (26) of the mobile communication system which calculates the position of the mobile station (21) on the basis of the time difference information and base station coordinates and clock information. With the method it is possible to measure signals the strengths of which remain below the minimum decoding level. According to the invention, it is also possible to measure bursts containing short training sequencies to improve timing measurement accuracy and measuring speed.