Rach ramp-up acknowledgement

CAFC
  • US 6,574,267 B1
  • Filed: 03/22/1999
  • Issued: 06/03/2003
  • Est. Priority Date: 03/22/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a first base station (BS) with a first BS-spread-spectrum transmitter and a first BS-spread-spectrum receiver, a second base station with a second BS-spread-spectrum transmitter and a second BS-spread-spectrum receiver, and a plurality of remote stations, with each remote station (RS) having an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver, the method comprising the steps of:

  • transmitting from said first BS-spread-spectrum transmitter located at said first base station, a first broadcast common-synchronization channel having a first common chip-sequence signal common to the plurality of remote stations, the first broadcast common-synchronization channel having a first frame-timing signal;

    transmitting from said second BS-spread-spectrum transmitter located at said second base station, a second broadcast common-synchronization channel having a second common chip-sequence signal common to the plurality of remote stations, the second broadcast common-synchronization channel having a second frame-timing signal;

    receiving at a first RS-spread-spectrum receiver the first broadcast common-synchronization channel, and determining a first frame timing at said first RS-spread-spectrum receiver from the first frame-timing signal;

    receiving at the first RS-spread-spectrum receiver the second broadcast common-synchronization channel, and determining a second frame timing at said first RS-spread-spectrum receiver from the second frame-timing signal;

    determining, based on any of power levels and probabilities of error, at said first RS-spread-spectrum receiver, from the first broadcast common-synchronization channel and from the second broadcast common-synchronization channel, to transmit to said first base station;

    transmitting from a first RS-spread-spectrum transmitter to said first base station, a first access-burst signal;

    receiving at said first BS-spread-spectrum receiver the first access-burst signal at a first detected-power level;

    transmitting from said first BS-spread-spectrum transmitter to said first RS-spread-spectrum receiver, responsive to the first access-burst signal, a first acknowledgment signal;

    receiving at said first RS-spread-spectrum receiver the first acknowledgment signal; and

    transmitting from said first RS-spread-spectrum transmitter, responsive to the first acknowledgment signal, to said first BS-spread-spectrum receiver, a first spread-spectrum signal having data.

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