Title:
【発明の名称】CDMAシステムにおける位置発見方法および装置
Document Type and Number:
Japanese Patent JP3254682
Kind Code:
B2
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.
Inventors:
Gosh, Amitava
Reed, John Douglas
Rozanski, Walter Joseph, Jr.
Baford, Kevin Andrew
Reed, John Douglas
Rozanski, Walter Joseph, Jr.
Baford, Kevin Andrew
Application Number:
JP53404296A
Publication Date:
February 12, 2002
Filing Date:
March 21, 1996
Export Citation:
Assignee:
MOTOROLA INCORPORATED
International Classes:
G01S5/14; G01S19/09; H04W36/32; G01S19/46; H04B7/26; H04W64/00; (IPC1-7): H04Q7/34; G01S5/14
Domestic Patent References:
| JP5264712A | ||||
| JP6165632A |
Attorney, Agent or Firm:
Masanori Honjo (2 others)
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