Method and apparatus for a portable communication device to iden

Details Method and apparatus for a portable communication device to iden Method and apparatus for a portable communication device to iden

1997-07-07

1999-05-04

Tarcza, Thomas

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

455524, H01Q 322

Patent

active

059008385

ABSTRACT:
A method and apparatus for a portable communication device, such as a mobile radio terminal in a CDMA network, to identify its geographic location. A communication network comprises multiple base stations which transmit pilot signals, where the pilot signals of one base station are offset from the pilot signals of other base stations by integral multiples of a substantially fixed duration. Associated sync channel messages are also transmitted from which the geographic location of the base stations may be extracted. A portable communication device identifies its location by calculating the delay between the arrival time of a pilot signal from a primary base station and the arrival times of pilot signals from at least two other base stations. For each pair of base stations corresponding to one of the calculated delays, the portable communication device initially specifies its location as being on a selected one of three curves. The current location of the portable communication device is identified based upon points of intersection of the selected curves. The identified location may be stored in, transmitted from, or displayed at the portable communication device.

REFERENCES:
patent: 5293645 (1994-03-01), Sood
patent: 5600706 (1997-02-01), Dunn et al.
patent: 5602903 (1997-02-01), LeBlanc et al.
patent: 5646632 (1997-07-01), Khan et al.

Affiliated with

Also associated with

Rating

Method and apparatus for a portable communication device to iden 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 apparatus for a portable communication device to iden, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for a portable communication device to iden will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1872531