REVERSE LINK POWER CONTROL IN AN ORTHOGONAL SYSTEM
First Claim
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1. A method of reverse link power control, comprising:
- enabling an outer loop power control when a data channel is present, wherein the outer loop power control comprises;
transmitting a packet;
determining whether the packet has been received without error;
decreasing an effective carrier-to-interference (C/I) setpoint if the packet has been received without error;
increasing the effective C/I setpoint if the packet has not been received without error;
enabling an inner loop power control, wherein the inner loop power control comprises;
regulating the transmit (TX) power based on a Received Power Over Thermal (RpOT) and the effective C/I setpoint; and
disabling the outer loop power control while maintaining the inner loop power control when no data channel is present.
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Abstract
A closed-loop reverse-link power control algorithm for a frequency hopping orthogonal frequency division multiple access (FH-OFDMA) system is described. The power control algorithm adjusts the user'"'"'s transmit power based on effective carrier-to-interference (C/I) and Received-Power-Over-Thermal (RpOT) measurements. The algorithm is inherently stable and is effective for FH-OFDMA systems with retransmissions.
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Citations
10 Claims
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1. A method of reverse link power control, comprising:
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enabling an outer loop power control when a data channel is present, wherein the outer loop power control comprises; transmitting a packet; determining whether the packet has been received without error; decreasing an effective carrier-to-interference (C/I) setpoint if the packet has been received without error; increasing the effective C/I setpoint if the packet has not been received without error; enabling an inner loop power control, wherein the inner loop power control comprises; regulating the transmit (TX) power based on a Received Power Over Thermal (RpOT) and the effective C/I setpoint; and disabling the outer loop power control while maintaining the inner loop power control when no data channel is present. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless communications device, comprising:
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means for enabling an outer loop power control when a data channel is present, wherein the outer loop power control comprises; means for transmitting a packet; means for determining whether the packet has been received without error; means for decreasing an effective carrier-to-interference (C/I) setpoint if the packet has been received without error; means for increasing the effective C/I setpoint if the packet has not been received without error; means for enabling an inner loop power control, wherein the inner loop power control comprises; means for determining whether a Received Power Over Thermal (RpOT) is greater than a maximum Received Power Over Thermal (RpOTmax); and means for disabling the outer loop power control while maintaining the inner loop power control when no data channel is present.
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9. A processor programmed to execute a method of estimating interference in a wireless communication system, the method comprising:
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enabling an outer loop power control when a data channel is present, wherein the outer loop power control comprises; transmitting a packet; determining whether the packet has been received without error; decreasing an effective carrier-to-interference (C/I) setpoint if the packet has been received without error; increasing the effective C/I setpoint if the packet has not been received without error; enabling an inner loop power control, wherein the inner loop power control comprises; regulating the transmit (TX) power based on a Received Power Over Thermal (RpOT) and the effective C/I setpoint; and disabling the outer loop power control while maintaining the inner loop power control when no data channel is present.
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10. A computer readable media comprising instructions stored thereon, wherein the instructions, when executed, comprise a method comprising:
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enabling an outer loop power control when a data channel is present, wherein the outer loop power control comprises; transmitting a packet; determining whether the packet has been received without error; decreasing an effective carrier-to-interference (C/I) setpoint if the packet has been received without error; increasing the effective C/I setpoint if the packet has not been received without error; enabling an inner loop power control, wherein the inner loop power control comprises; regulating the transmit (TX) power based on a Received Power Over Thermal (RpOT) and the effective C/I setpoint; and disabling the outer loop power control while maintaining the inner loop power control when no data channel is present.
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Specification