Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1997-08-18
1999-09-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342463, 342465, G01S 302
Patent
active
059529695
ABSTRACT:
The disclosure describes a novel Time Difference of Arrival (TDOA) method and system for determining the position of a mobile radio terminal within an associated mobile radio system, which is based on Time of Arrival (TOA) measurements, including a plurality of radio base stations, measuring devices, network controller, and service node. The measuring devices are synchronized in otherwise unsynchronized radio base stations. The measuring devices measure TOA on demand and (optionally) Direction of Arrival (DOA), on a digital uplink time slot or on digital information on an analog uplink traffic channel in one or more radio base stations. The TOA and DOA information and the traffic channel number are reported to a Mobile Services Switching Center, which obtains the mobile terminal's identity from the traffic channel number and sends the terminal identity and TOA and DOA measurement information to a Service Node. The Service Node calculates the position of the mobile radio terminal using the TOA information (supplemented by the DOA information when available).
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Ghisler Walter
Hagerman Bo
Mazur Sara
Phan Dao L.
Tarcza Thomas H.
Telefonakiebolaget L M Ericsson (publ)
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