Virtual locating of a fixed subscriber unit to reduce re-acquisi

Details Virtual locating of a fixed subscriber unit to reduce re-acquisi Virtual locating of a fixed subscriber unit to reduce re-acquisi

1996-06-27

1999-08-17

Ton, Dang

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370519, H04J 1300

Patent

active

059403829

ABSTRACT:
A novel system and method reduces the time required by a base station to re-acquire a fixed subscriber unit in a CDMA communication system by virtually locating of the subscriber units. A base station acquires subscriber units by searching only those code phases concomitant with the largest propagation delay possible in the cell, as if all subscriber units were located at the periphery of the cell. A subscriber unit which has never been acquired by the base station varies the delay between the PN code phase of its received and transmitted signals over the range of possible delays in a cell and slowly ramps-up its transmission power until it is acquired by the base station. Upon initial acquisition by the base station, the subscriber unit ceases ramping-up its transmission power, ceases varying the delay and internally stores the final value of the delay in memory. For subsequent re-acquisition, the subscriber unit adds the delay value between the PN code phase of its received and transmitted signals, making the subscriber virtually appear to be at the periphery of the cell. This permits a quick ramp-up of transmission power by the subscriber unit and reduced acquisition time by the base station.

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Patent Abstracts of Japan, vol. 015, No. 003 (E-1019), Jan. 7, 1991 & JP 02 256331 A (Sharp Corp.), Oct. 17, 1990, see abstract.

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