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Power and data rate control in a multi-rate wireless system

  • US 7,346,364 B1
  • Filed: 10/29/2003
  • Issued: 03/18/2008
  • Est. Priority Date: 10/29/2003
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a signal from a remote wireless entity;

    first determining a data rate and a receive power of said received signal;

    second determining a receiver sensitivity at said data rate;

    calculating a link margin using said receiver sensitivity and said receive power;

    when said calculated link margin is within a first range, selecting a first transmit data rate for use in transmitting data to said remote wireless entity;

    when said calculated link margin is within a second range, selecting a second transmit data rate for use in transmitting data to said remote wireless entity, said second transmit data rate being different from said first transmit data rate; and

    when said calculated link margin is greater than a threshold value;

    selecting a third transmit data rate for use in transmitting data to said remote wireless entity, said third transmit data rate being different from said first and second transmit data rates;

    reducing a transmit power level for use in transmitting data to said remote wireless entity by a first amount to form a reduced transmit power level;

    transmitting a signal to said remote wireless entity at said reduced transmit power level and said third transmit data rate;

    third determining whether an acknowledgement signal has been received from said remote wireless entity in response to said transmitted signal; and

    when an acknowledgement signal has been received in response to said transmitted signal, repeating reducing, transmitting, and third determining until an acknowledgement signal is not received in response to a transmitted signal;

    wherein said threshold value is greater than an upper limit of said first range and an upper limit of said second range.

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