Method and apparatus for location finding in a CDMA system

Details Method and apparatus for location finding in a CDMA system Method and apparatus for location finding in a CDMA system

1996-02-16

1998-04-07

Blum, Theodore M.

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

Directive

Position indicating

379 63, 455 561, G01S 302

Patent

active

057369640

ABSTRACT:
A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.

REFERENCES:
patent: 4670906 (1987-06-01), Thro
patent: 5396541 (1995-03-01), Farwell et al.
patent: 5526357 (1996-06-01), Jandrell

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