Spread-spectrum handoff and source congestion avoidance system and method

  • US 6,314,126 B1
  • Filed: 01/12/2001
  • Issued: 11/06/2001
  • Est. Priority Date: 01/12/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. An improvement method to a spread-spectrum system comprising the steps of:

  • transmitting, using radio waves, from a first base station (BS) a first BS-packet signal spread by a first BS-chip-sequence signal at a first frequency;

    receiving at a remote station (RS) the first BS-packet signal;

    transmitting, using radio waves, from said first base station a first BS-channel-sounding signal at a second frequency;

    receiving at said remote station the first BS-channel-sounding signal at the second frequency;

    tracking at said remote station the first BS-channel-sounding signal, thereby outputting a first RS-receiver signal;

    adjusting, in response to the first RS-receiver signal, a first initial RS-power level of said remote station;

    transmitting, using radio waves, from said remote station (RS), a first RS-packet signal spread by a first RS-chip-sequence signal at a second frequency, at the initial RS-power level;

    receiving at said first base station the first RS-packet signal at the second frequency;

    sending the first RS-packet signal to a central office from the first base station, with the first RS-packet signal including a source address from the first base station;

    transmitting, using radio waves, from a second base station a second BS-packet signal spread by a second BS-chip-sequence signal at the first frequency;

    transmitting, using radio waves, from said second base station a second BS-channel-sounding signal at the second frequency, with the second BS-channel-sounding signal having a bandwidth no more than twenty per cent of the spread-spectrum bandwidth of the first BS-packet signal spread by the first BS-chip-sequence signal at the first frequency;

    monitoring at said remote station a signal metric of the first BS-packet signal and a signal metric of the first BS-channel-sounding signal, and a signal metric of the second BS-packet signal and a signal metric of the second BS-channel-sounding signal;

    determining at said remote station that the signal metric of at least one of the first BS-packet signal and the first BS-channel-sounding signal fall below a threshold, and that the signal metric of at least one of the second BS-packet signal and the second BS-channel-sounding signal are above the threshold, and that the second base station has available capacity, thereby determining to change base stations;

    receiving at said remote station the second BS-channel-sounding signal at the second frequency;

    tracking at said remote station the second BS-channel-sounding signal, thereby outputting a second RS-receiver signal;

    adjusting, in response to the second RS-receiver signal, a second initial RS-power level of said remote station;

    transmitting, using radio waves, from said remote station (RS), a second RS-packet signal spread by a second RS-chip-sequence signal at the second frequency, at the second initial RS-power level;

    transmitting, using radio waves, in response to determining to change base stations, from said remote station a second RS-packet signal spread by a second RS-chip-sequence signal at the second frequency;

    receiving at said second base station the second RS-packet signal at the second frequency;

    sending the second RS-packet signal to a central office (CO) from the second base station, with the second RS-packet signal including a source address from the second base station;

    sending from said central office a CO-packet signal including a destination address for the second base station;

    receiving at said second base station the CO-packet signal;

    transmitting, using radio waves, from said second base station the CO-packet signal the first frequency; and

    receiving at said remote station the CO-packet signal.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×