System and method for distributed power control in a communications system
First Claim
1. A method for relay node communication, the method comprising:
- transmitting a signal at a transmit power level on a first channel from a relay node to a user equipment;
receiving a message comprising a first indication of channel quality of the first channel at the transmit power level;
determining a second indication of channel quality of a second channel between a communications controller and the relay node, wherein the first channel and the second channel are in a same multi-hop communication path; and
altering the transmit power level of the first channel based on the first indication of channel quality and the second indication of channel quality to converge the channel quality of the first channel to a convergence value.
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Abstract
A system and method for distributed power control in a communications system are provided. A method for relay node operations includes transmitting a signal at a transmit power level on a first channel from a relay node to a user equipment, receiving a message comprising a first indication of channel quality of the first channel at the transmit power level, and determining a second indication of channel quality of a second channel between a communications controller and the relay node, where the first channel and the second channel are in a same multi-hop communication path. The method also includes altering the transmit power level of the first channel based on the first indication of channel quality and the second indication of channel quality to converge the channel quality of the first channel to a convergence value.
227 Citations
32 Claims
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1. A method for relay node communication, the method comprising:
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transmitting a signal at a transmit power level on a first channel from a relay node to a user equipment; receiving a message comprising a first indication of channel quality of the first channel at the transmit power level; determining a second indication of channel quality of a second channel between a communications controller and the relay node, wherein the first channel and the second channel are in a same multi-hop communication path; and altering the transmit power level of the first channel based on the first indication of channel quality and the second indication of channel quality to converge the channel quality of the first channel to a convergence value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for communications controller operations, the method comprising:
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setting, at a communications controller, a first transmit power level for a transmission made by a relay node over a first channel between the relay node and a user equipment, wherein the relay node is controlled by the communications controller; transmitting, over a second channel between the communications controller and the relay node, a signal at a second transmit power level, wherein the first channel and the second channel are in a same multi-hop communication path; initiating an execution of a power control algorithm at the relay node to alter the first transmit power level based on a first indication of channel quality of the first channel and a second indication of channel quality of the second channel to converge the channel quality of the first channel to the channel quality of the second channel; and stopping the power control algorithm at the relay node when a stopping condition is met. - View Dependent Claims (17, 18, 19)
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20. A relay node comprising:
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a transmitter configured to transmit a signal at a transmit power level on a first channel from the relay node to a user equipment; a receiver configured to receive a message comprising a first indication of channel quality of the first channel at the transmit power level; and a processor coupled to the transmitter and to the receiver, the processor configured to determine a second indication of channel quality of a second channel between a communications controller and the relay node, wherein the first channel and the second channel are in a same multi-hop communication path, and configured to alter the transmit power level of the first channel based on the first indication of channel quality and the second indication of channel quality to converge the channel quality of the first channel to a convergence value. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A communications controller comprising:
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a processor configured to set a first transmit power level for a transmission made by a relay node over a first channel between the relay node and a user equipment, wherein the communications controller controls the relay node, and configured to initiate an execution of a power control algorithm at the relay node, wherein the power control algorithm alters the first transmit power level based on a first indication of channel quality of the first channel and a second indication of channel quality of a second channel between the communications controller and the relay node to converge the channel quality of the first channel to the channel quality of the second channel, wherein the first channel and the second channel are in a same multi-hop communications path and configured to stop the power control algorithm at the relay node when a stopping condition is met; and a transmitter coupled to the processor, the transmitter configured to transmit a signal at a second transmit power level over the second channel. - View Dependent Claims (30, 31, 32)
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Specification