Power and data rate control in a multi-rate wireless system
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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Abstract
Transmit parameters are adjusted for a wireless device based on link margin. In at least one embodiment, link margin is calculated as a difference between a received power level and receiver sensitivity.
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Citations
20 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless device comprising:
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a wireless transceiver; a link margin determination unit to determine a link margin associated with a signal received by the wireless transceiver, using a receive power level of said signal received by the wireless transceiver; a transmit data rate determination unit to select a transmit data rate for the wireless transceiver based on said link margin determined by said link margin determination unit, wherein said transmit data rate determination unit selects said transmit data rate by determining which of a plurality of link margin ranges said link margin falls within, each range in said plurality of ranges corresponding to a different transmit data rate; and a transmit power determination unit to determine a transmit power level for the wireless transceiver, wherein said transmit power determination unit, when said link margin determined by said link margin determination unit is greater than a threshold value, operates to; reduce the transmit power level of the wireless transceiver in predetermined decrements until a signal transmitted by the wireless device no longer receives an acknowledgement from a remote wireless entity; when a signal transmitted by the wireless device no longer receives an acknowledgement from a remote wireless entity, increase the transmit power level of the wireless device by a first amount to form an increased transmit power level; and determine whether a signal transmitted by the wireless device at said increased transmit power level receives an acknowledgement from the remote wireless entity. - View Dependent Claims (9, 10, 11, 12)
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13. An article comprising a computer readable storage medium having instructions stored thereon that, when executed by a computing platform, result in:
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first determining a data rate and a receive power of a signal received from a remote wireless entity; 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. - View Dependent Claims (14, 15, 16, 17)
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18. A wireless device comprising:
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at least one dipole antenna; a wireless transceiver coupled to said at least one dipole antenna; a link margin determination unit to determine a link margin associated with the wireless transceiver using a power level of a signal received by the wireless transceiver; a transmit data rate determination unit to select a transmit data rate for the wireless transceiver based on said link margin determined by said link margin determination unit, wherein said transmit data rate determination unit selects said transmit data rate by determining which of a plurality of link margin ranges said link margin falls within, each range in said plurality of ranges corresponding to a different transmit data rate; and a transmit power determination unit to determine a transmit power level for the wireless transceiver, wherein said transmit power determination unit, when said link margin determined by said link margin determination unit is greater than a threshold value, operates to; reduce the transmit power level of the wireless transceiver in predetermined decrements until a signal transmitted by the wireless device no longer receives an acknowledgement from a remote wireless entity; when a signal transmitted by the wireless device no longer receives an acknowledgement from a remote wireless entity, increase the transmit power level of the wireless device by a first amount to form an increased transmit power level; and determine whether a signal transmitted by the wireless device at said increased transmit power level receives an acknowledgement from the remote wireless entity. - View Dependent Claims (19, 20)
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Specification