Method and system for determining position of a cellular mobile

Details Method and system for determining position of a cellular mobile Method and system for determining position of a cellular mobile

1997-09-23

2000-01-04

Nguyen, Lee

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

342457, H04Q 720

Patent

active

060119748

ABSTRACT:
A method and system are disclosed by which a round-trip calculation is used to determine the distance between a mobile radio station (MS) and a radio base station (BS) using the apparent uplink and downlink signal propagation air-times (e.g., T-up and T-down). As such, no absolute time reference is required. The MS and BS report to a service node in the mobile network the local departure and arrival times of the uplink and downlink signals, and calculate the apparent air-times, T-up and T-down. The distance, D, between the MS and BS can be calculated as D=c(T-up+T-down)/2, where "c" equals the speed of light. The distances, D1, D2 and D3, to at least three base stations whose locations are known, can be used in a triangulation algorithm to determine the MS's position.

REFERENCES:
patent: 3646580 (1972-02-01), Fuller et al.
patent: 5423067 (1995-06-01), Manabe
patent: 5508708 (1996-04-01), Ghosh et al.
patent: 5515062 (1996-05-01), Maine et al.
patent: 5542100 (1996-07-01), Hatakeyama
ISR for RS 100199 US Completed on Feb. 27, 1998, Date Mar. 3, 1998, EPX.

Affiliated with

Also associated with

Rating

Method and system for determining position of a cellular mobile does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for determining position of a cellular mobile , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for determining position of a cellular mobile will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1079814