Method and apparatus for mobile station location within a commun

Details Method and apparatus for mobile station location within a commun Method and apparatus for mobile station location within a commun

1998-03-13

1999-12-28

Vu, Huy D.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

455456, H04J 1302

Patent

active

06009091&

ABSTRACT:
A Dedicated Physical Location Channel (DPLCH) is utilized by a mobile station (913) to support subscriber location functions. The DPLCH is spread by an Orthogonal Variable Spreading Factor (OVSF) code C.sub.L (502) of length 256 which is distinct from those OVSF codes assigned to other channels utilized by the mobile station (913). When a power-up function (PUF) is received by the mobile station (913), the DPLCH sub-channel amplitude is then modified relative to the other channels being utilized by the mobile station (913) using gain module G.sub.L (503) prior to combination (504) with the other channels.

REFERENCES:
patent: 5508708 (1996-04-01), Ghosh et al.
patent: 5548583 (1996-08-01), Bustamante
patent: 5736964 (1998-04-01), Ghosh et al.
patent: 5878034 (1999-03-01), Hershey et al.
"Location Power Up Function," TR45.5.2.3/97.07.17.02 by A. Ghosh, G. Bruckert, B. Verbiscer and M. Panjwani and in ETSI SMG2 document UMTS A36/97 and USPT#5,508,708 dated Apr. 16, 1996 by Ghosh et. al.
"Tree Structured Generation of Orthogonal Spreading Codes with different lengths for Forward Link of DS-CDMA Mobile Radio," Electronics Letters, Jan. 2, 1997, pp. 27-28, by F. Adachi, M. Sawahashi, and K. Okawa.
"Concept Group Alpha--Direct-Sequence CDMA (WCDMA)" Evaluation Document (3.0), Part 1,Dec.15-19, 1997.

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