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Cell Phones

Mobile-station-positioning-system

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Mobile station positioning system

Details

Inventors: Silventoinen, Marko; Rantalainen, Timo; Raitola, Mika; Ranta, Jukka Tapio;
Assignee: Nokia Mobile Phones, Ltd. (Salo, FI)
Primary Examiner: Dolinar; Andrew M.
Assistant Examiner:
Attorney, Agent or Firm: Perman & Green, LLP

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. The time difference measurement results obtained are transmitted from the mobile station to a base station advantageously by encoding the results in a signalling channel (SACCH) burst. The method enables quick position measuring at short intervals without substantially increasing the load on the mobile station or on the air interface.

DETAILED DESCRIPTION An idea of the invention is to calculate the position of a mobile station on the basis of the observed time difference (OTD) between signals received from at least two base stations.
The time difference measurement is advantageously performed in the mobile station and the measurement result is transmitted to the serving base station.
Time difference measurement can be advantageously implemented using received bursts the strengths of which are below the decoding level of the mobile station.
Transmission of the measurement result advantageously occurs on the signalling channel.
After the transmission of measurement results, a positioning service center (PSC) in the mobile communication network determines on the basis of the measurement results and base station location coordinates and clock information an estimate for the location coordinates of the mobile station.
The method according to the invention is characterized by what is expressed in the characterizing part of claim 1.
The positioning system according to the invention is characterized by what is expressed in the characterizing part of claim 6.
The mobile station according to the invention is characterized by what is expressed in the characterizing part of claim 7.
Advantageous embodiments of the invention are described in the sub-claims.

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