Controlling forward link traffic channel power
First Claim
1. A method of controlling forward link traffic channel transmission power, Ptransmit, to a user terminal in a wireless communications system having a plurality of beams, comprising the steps of:
- (a) receiving from the user terminal an active pilot channel signal to noise ratio (SNR);
(b) determining a baseline power level, Pbaseline, from the received active pilot channel SNR, wherein the determining step comprises calculating a power level offset, Po, according to P0=Ebt/Nt+10log (R/W)−
Ecp/Nt, wherein Ebt/Nt is a desired forward link traffic channel SNR in decibels (dB),R is a forward link traffic channel data rate, W is a spreading bandwidth, and Ecp/Nt is the received active pilot channel SNR in dB and adding Po to a pilot channel transmit power level;
(c) identifying a user terminal interference susceptibility;
(d) determining a power margin,Pmargin from the identified interference susceptibility;
(e) identifying a packet error rate (PER) associated with the user terminal;
(f) determining a power level correction, Pcorrection, based on the PER; and
(g) setting Ptransmit based on Pbaseline, Pmargin, and Pcorrection.
1 Assignment
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Accused Products
Abstract
Forward link transmission power to a user terminal in a wireless communications system having a plurality of beams is controlled by determining a baseline power level, Pbaseline, from a received active pilot channel signal-to-noise ratio (SNR); determining a power margin, Pmargin, from an identified interference susceptibility; determining a power level correction, Pcorrection, based on an identified packet error rate (PER); and setting Ptransmit based on Pbaseline, Pmargin, and Pcorrection. For example, Ptransmit may be set to a power level that is substantially equal to the sum of Pbaseline, Pmargin, and Pcorrection. The determination of each of Pbaseline, Pmargin, and Pcorrection may be performed in independently running control loops or processes.
16 Citations
24 Claims
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1. A method of controlling forward link traffic channel transmission power, Ptransmit, to a user terminal in a wireless communications system having a plurality of beams, comprising the steps of:
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(a) receiving from the user terminal an active pilot channel signal to noise ratio (SNR); (b) determining a baseline power level, Pbaseline, from the received active pilot channel SNR, wherein the determining step comprises calculating a power level offset, Po, according to P0=Ebt/Nt+10log (R/W)−
Ecp/Nt, wherein Ebt/Nt is a desired forward link traffic channel SNR in decibels (dB),R is a forward link traffic channel data rate, W is a spreading bandwidth, and Ecp/Nt is the received active pilot channel SNR in dB and adding Po to a pilot channel transmit power level;(c) identifying a user terminal interference susceptibility; (d) determining a power margin,Pmargin from the identified interference susceptibility; (e) identifying a packet error rate (PER) associated with the user terminal; (f) determining a power level correction, Pcorrection, based on the PER; and (g) setting Ptransmit based on Pbaseline, Pmargin, and Pcorrection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for controlling forward link traffic channel transmission power, Ptransmit,to a user terminal in a wireless communications system having a plurality of beams, comprising:
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a selector for determining a baseline power level, Pbaseline, from a received active pilot channel SNR, a power margin, Pmargin, from an identified interference susceptibility, and a power level correction, Pcorrection, from an identified packet error rate (PER), wherein the base line power level, Pbaseline, comprises a power level offset, Po, according to Po=Ebt/Nt+10 log (R/W)−
Ecp/Nt, whereinEbt/Nt is a desired forward link traffic channel SNR in decibels (dB), R is a forward link traffic channel data rate, W is a spreading bandwidth, and Ecp/Nt is the received active pilot channel SNR in dB; andmeans for adding Po to a pilot channel transmit power level; and a transceiver for setting the forward link transmission power, Ptransmit, based on Pbaseline, Pmargin, and Pcorrection. - View Dependent Claims (13)
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14. A system for controlling forward link traffic channel transmission power, Ptransmit, to a user terminal in a wireless communications system having a plurality of beams, comprising:
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means for receiving from the user terminal an active pilot channel signal to noise ratio (SNR); means for determining a baseline power level, Pbaseline, from the received active pilot channel SNR, wherein said means for determining a baseline power level comprises a means for calculating a power level offset,Po according to Po=Ebt/Nt+10 log (R/W)−
Ecp/Nt, wherein Ebt/Nt is a desired forward link traffic channel SNR in decibels (dRY R is a forward link traffic channel data rate, W is a spreading bandwidth, and Ecp/Nt is the received active pilot channel SNR in dB and a means for adding Po to a pilot channel transmit power level;means for identifying a user terminal interference susceptibility; means for determining a power margin, Pmargin, from the identified interference susceptibility; means for identifying a packet error rate (PER) associated with the user terminal; means for determining a power level correction, Pcorrection, based on the PER; and means for setting Ptransmit based on Pbaseline,Pmargin, and Pcorrection. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification