Improvements in downlink observed time difference measurements

Details Improvements in downlink observed time difference measurements Improvements in downlink observed time difference measurements

G - Physics

01

S

G01S 5/10 (2006.01) H04W 64/00 (2009.01) G01S 1/02 (2010.01)

Patent

CA 2338544

A mobile communication station in (MSI) a wireless communication network is used to measure the respective times of arrival of radio signals respectively transmitted by a plurality of radio transmitters (23, 28) in the network. The mobile communication station is provided with real time difference information indicative (RTDs) of differences between a time base (60) used by a radio transmitter (23) serving the mobile communication station and respective time bases used by the other radio transmitters. The mobile communication station determines, in response to the real time difference information and relative to the time base used by the radio transmittter serving the mobile communication station, a plurality of points in time at which the respective radio signals are expected to arrive at the mobile communication station. For each radio signal, the mobile communication station monitors for arrival of the radio signal during a period of time after the point in time at which the radio signal is expected to arrive.

L'invention concerne l'utilisation d'une station de communication mobile (MS1) dans un réseau de communication sans fil pour mesurer les temps d'arrivée respectifs de signaux radio émis respectivement par plusieurs émetteurs radio (23, 28) dans le réseau. La station de communication mobile comprend des informations de décalage horaire en temps réel (RTD) indiquant les différences entre une base de temps (60) utilisée par un émetteur radio(23) desservant la station de communication mobile et des bases de temps respectives utilisées par les autres émetteurs radio. La station de communication mobile détermine, en réponse aux informations de décalage horaire en temps réel et par rapport à la base de temps utilisée par l'émetteur radio desservant la station de communication mobile, plusieurs points dans le temps auxquels on prévoit que les signaux radio respectifs arrivent dans la station de communication mobile. Pour chaque signal radio, la station de communication mobile contrôle l'arrivée du signal radio pendant une période se situant après le point dans le temps auquel on prévoit l'arrivée du signal radio.

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