Patent ID: 6169759
Filing Date: 2001-01-02
Classification: H04B,H04J,H04L,H04W

Abstract:
In a code-division-multiple-access (CDMA) system employing spread-spectrum modulation comprising a base station (BS) comprising a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver, and a plurality of remote stations, each remote station (RS) comprising an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver, a method comprising the steps of: transmitting from said BS-spread-spectrum transmitter, a broadcast common-synchronization channel having a common chip-sequence signal, the broadcast common-synchronization channel comprising a frame-timing signal;receiving at an RS-spread-spectrum receiver of one remote station the broadcast common-synchronization channel, and determining frame timing at said RS-spread-spectrum receiver from the frame-timing signal; transmitting from an RS-spread-spectrum transmitter of the one remote station an access-burst signal, the access-burst signal comprising a plurality of segments having a plurality of respective power levels; receiving at said BS spread-spectrum receiver at least one segment of the access-burst signal at a detected-power level; responsive to receipt of the at least one segment transmitting an acknowledgment signal from said BS-spread-spectrum transmitter; receiving the acknowledgment signal at said RS-spread-spectrum receiver; transmitting from said RS-spread-spectrum transmitter, responsive to the receipt of the acknowledgment signal, a spread-spectrum signal comprising data; and transmitting from said BS-spread-spectrum transmitter, any of data and power control information, to said RS-spread-spectrum receiver.