US 8,412,258 B1Granted

Method and system for forward link and/or reverse link power control

AssigneeSprint Spectrum L.P.

InventorsManoj Shetty, Sachin R. Vargantwar, Siddharth S. Oroskar, Kamal Doshi, Anoop K. Goyal

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Abstract

Methods and systems for adjusting a transmit power of a forward link or reverse link signal make use of variable adjustment parameters. The wireless signal is received to obtain a received signal. An observed signal-to-noise ratio (SNR) and an observed frame error rate (FER) for the received signal are determined. In an outer loop process, an adjustment increment is selected based on how much the observed FER differs from the target FER, and the target SNR is adjusted by the adjustment increment. In an inner loop process, a power adjustment command is selected based on a comparison between the observed SNR and a target SNR. The power adjustment command instructs the transmitter of the wireless signal to either increase or decrease the transmit power of the wireless signal. The power adjustment increment may also depend on the observed FER.

Claims16

Dependent claims

A method for adjusting a setpoint that is used to control a transmit power of a wireless signal, said method comprising:

receiving said wireless signal to obtain a received signal;
determining an observed error level in said received signal;
selecting an adjustment increment, wherein selecting said adjustment increment comprises:
when said observed error level is greater than a target error level, selecting an upward adjustment increment from among at least a first upward adjustment value, a second upward adjustment value, and a third upward adjustment value based on said observed error level, wherein said first upward adjustment value is associated with a first range of observed error levels greater than said target error level, said second upward adjustment value is associated with a second range of observed error levels greater than said target error level, and said third upward adjustment value is associated with a third range of observed error levels greater than said target error level;
and
when said observed error level is less than said target error level, selecting a downward adjustment increment from among at least a first downward adjustment value, a second downward adjustment value, and a third downward adjustment value based on said observed error level, wherein said first downward adjustment value is associated with a first range of observed error levels less than said target error level, said second downward adjustment value is associated with a second range of observed error levels less than said target error level, and said third downward adjustment value is associated with a third range of observed error levels less than said target error level;
and
adjusting said setpoint by said selected adjustment increment.

5 more elements

A system for controlling a transmit power of a wireless signal transmitted by a wireless communication device, comprising:

a receiver for receiving said wireless signal to obtain a received signal;
data storage;
a processor;
instructions stored in said data storage and executable by said processor to cause said system to perform functions comprising:
(a) determining an observed signal-to-noise ratio (SNR) of said received signal;
(b) selecting a power adjustment command based on a comparison between said observed SNR and a target SNR;
(c) determining an observed error level in said received signal;
(d) selecting an adjustment increment, wherein selecting said adjustment increment comprises:
when said observed error level is greater than a target error level, selecting an upward adjustment increment from among at least a first upward adjustment value, a second upward adjustment value, and a third upward adjustment value based on said observed error level, wherein said first upward adjustment value is associated with a first range of observed error levels greater than said target error level, said second upward adjustment value is associated with a second range of observed error levels greater than said target error level, and said third upward adjustment value is associated with a third range of observed error levels greater than said target error level, and
when said observed error level is less than said target error level, selecting a downward adjustment increment from among at least a first downward adjustment value, a second downward adjustment value, and a third downward adjustment value based on said observed error level, wherein said first downward adjustment value is associated with a first range of observed error levels less than said target error level, said second downward adjustment value is associated with a second adjustment values less than said target error level, and said third downward adjustment value is associated with a third range of observed error levels less than said target error level;
and
(e) adjusting said target SNR by said selected adjustment increment;
and
a transmitter for transmitting said selected power adjustment command to said wireless communication device.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/478,315Filed 23 May 2012 · continuation
Priority: 15 Aug 2007
Granted: 2 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04W 52/12
TPC algorithms: outer and inner loops
H04W 52/362
With a discrete range or set of values, e.g. step size, ramping or offsets: aspects of the step size
H04W 52/545
Signalisation aspects of the TPC commands, e.g. frame structure: modifying TPC bits in special situations
H04W 52/20
TPC being performed according to specific parameters: using error rate