Telia Ab

Televerket

Bo Olsson

Mats Olof Winroth

Osten Makitalo

A procedure to transmit information at a telephone answering service, especially in mobile telephone systems. The telephone answering service has a voice mailbox for recording of speech, and also transmits a text message to the mobile telephone especially via SMS (short Message Service). The procedure makes possible an improved functionality in the system in so far as the text message is transmitted in parallel to the mobile telephone from which listening to the voice mailbox is performed. The text message usually contains a telephone number which can be connected with applications in the mobile terminal. The procedure makes it possible that telephone numbers or personal messages, manually or automatically, are stored in the mobile answer function and are transmitted to the listening mobile terminal.

Procedure to transmit information at telephone answering service

The invention relates to a method for locating mobile stations in a digital telecommunication network, especially the GSM network. According to the invention, reference measurements are carried out on relevant traffic routes with the aid of a measuring mobile in order to provide position information related to measured signals. With the aid of these reference data and the position information, an adaptive neural network is trained, which network, with the aid of corresponding measurement data which are transmitted from the mobile station to a respective base station, carries out the localization of the mobile station. Use of the adaptive neural network provides a more accurate position determination than earlier systems which were only based on the TA (timing advance) value.

Method for locating mobile stations in a digital telephone network

The invention relates to a method and an arrangement for improving the communication between a base station and a number of mobile units belonging to it in a microcell system. In greater detail, the invention has the aim of reducing the fading which is a problem when the mobile units are moving slowly or are standing still. According to the invention, the problem is solved by introducing diversity on the downlink in the system. The antenna pattern of the base station is turned so that a wave pattern varying with time is produced with spatially separated fading points. The communication preferably utilizes time-division multiple access (TDMA), the turning of the antenna pattern being effected step by step between suitable time slots, preferably between TDMA frames. The turning of the antenna pattern is advantageously produced by controlling a sectoral antenna (7, 7'). In a preferred embodiment, the directional antenna (7') comprises an active element (10') in the form of a half-wave dipole surrounded by a dielectric (11) which, in turn, is enclosed in a cylinder which is made up of a number of passive elements (9') insulated from one another. The turning of the antenna pattern of the directional antenna is produced by electrically switching the passive elements.

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Haninge, Sweden

Bo Olsson