(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2005/0271025 Al
Guethaus et al. (43) Pub. Date: Dec. 8,2005
(54) METHODS OF AVOIDING MULTIPLE
DETECTIONS OF RANDOM ACCESS
CHANNEL PREAMBLE IN WIRELESS
(76) Inventors: Roland Guethaus, Schwaig (DE);
Thomas Kleinhenz, Nuernberg (DE)
HARNESS, DICKEY & PIERCE, P.L.C.
P.O. Box 8910
Reston, VA 20195 (US)
(21) Appl. No.: 10/861,475
(22) Filed: Jun. 7, 2004
Publication Classification (51) Int. CI.7 I HUB 7/216
In a method of avoiding multiple detection of the same random access channel (RACH) preamble in a wireless communication system, and within a given set of access slots, a given sub-set of available preamble signatures corresponding to a RACH preamble of a user may be detected, so as to avoid multiple RACH preamble detection in a given access slot. Another method may be directed to switching operations of a base station in a communication network. Base station operations may be switched back and forth between multi-sector/single cell operations and single sector/multi-cell operations without changing an existing antenna configuration.