Method and system for determining position of mobile radio termi

Details Method and system for determining position of mobile radio termi Method and system for determining position of mobile radio termi

1997-11-26

2000-05-16

Hunter, Daniel S.

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455457, 455440, 455441, H04Q 700, H04Q 724

Patent

active

060648880

ABSTRACT:
A method and system are disclosed for determining the distance between a radio receiver (RX) and a radio transmitter (TX) by uplink time measurements, whereby uplink messages are transmitted by the transmitter (TX) and used primarily for position determination. In one embodiment, the uplink messages are intra-cell handover messages if the transmitter (TX) is a component of a mobile radio terminal which is operating in accordance with an existing TDMA standard. In a second embodiment, the uplink messages are a new type of message transmitted in time slots not used by the mobile radio terminal and preferably, also not used by other mobile radio terminals in the system, if the transmitter (TX) is a component of a mobile radio terminal which is operating in accordance with a new or emerging TDMA standard. The evolving GSM radio air-interface standard is an example of such a TDMA standard.

REFERENCES:
patent: 5512908 (1996-04-01), Herrick
patent: 5513243 (1996-04-01), Kage
patent: 5608410 (1997-03-01), Stilp et al.
patent: 5613205 (1997-03-01), Dufour
patent: 5657487 (1997-08-01), Doner
patent: 5666662 (1997-09-01), Shibuya
patent: 5903844 (1999-05-01), Bruckert et al.
U.S. application No. 08/894,466, Hagerman et al., filed Aug. 18, 1997.
U.S. application No. 08/978,960, Lundqvist et al., filed Nov. 29, 1997.

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