Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-02-10
1999-09-28
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455524, H04Q 720
Patent
active
059603550
ABSTRACT:
The present invention teaches a method, system, terminals and service node for geographically positioning a first mobile radio terminal (MS1) within a radio network (100) comprising unsynchronised radio base stations by using a plurality of second fixed radio terminals (MS2) whereby the positions of the radio base stations and the second fixed radio terminals are known. First and second radio terminals (MS1,MS2) measure the relative receive times between the timing signals downlink (113-118) received from at least three radio base stations (BS1,BS2,BS3) and the second fixed radio terminals (MS2)send them to a service node (107) in the network (100) using them for calculating the transmission time offsets of the timing signals downlink. Calculating the position of the first mobile radio terminal (MS1) is performed either in the service node (107) in the network (100) or in the terminal (MS1) itself, after respectively sending relative receive time measurements from the first mobile radio terminal (MS1) to the service node (107), or broadcasting transmission time offset values and known positions from the service node (107) to the first radio terminal (MS1) to be positioned.
REFERENCES:
patent: 5293645 (1994-03-01), Sood
patent: 5608410 (1997-03-01), Stilp et al.
patent: 5629710 (1997-05-01), Sawada
patent: 5646632 (1997-07-01), Khan et al.
patent: 5809424 (1998-09-01), Eizenhoefer
International-Type Search Report re: SE96/00156 Date of mailing of Report: Oct. 25, 1996.
Ekman Kenneth
Ghisler Walter
Hedlund Anders
Lundqvist Rikard
Bhattacharya Sam
Eisenzopf Reinhard J.
Telefonaktiebolaget LM Ericsson
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