System and method for distributed power control in a communications system
First Claim
1. A method for power control in a multi-hop communications system, the method comprising:
- transmitting a power usage pattern for each relay node in a subset of relay nodes served by a communications controller, wherein the power usage pattern specifies transmit power levels for the relay node while the relay node is operating in a power control mode;
receiving channel measurements of access links between each relay node in the subset of relay nodes and subscriber equipment served by the relay node;
determining backhaul link transmit power levels and access link transmit power levels based on the channel measurements of access links and channel measurements of backhaul links between the communications controller and each relay node in the subset of relay nodes; and
transmitting the access link power levels to the subset of relay nodes.
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Abstract
An embodiment method for power control in a multi-hop communications system includes transmitting a power usage pattern for each relay node in a subset of relay nodes served by a communications controller, where the power usage pattern specifies transmit power levels for the relay node while the relay node is operating in a power control mode. The method also includes receiving channel measurements of access links between the relay nodes in the subset of relay nodes and subscriber equipment served by the relay nodes, determining backhaul link transmit power levels and access link transmit power levels based on the channel measurements of access links and channel measurements of backhaul links between the communications controller and the relay nodes, and transmitting the access link power levels to the subset of relay nodes.
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Citations
24 Claims
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1. A method for power control in a multi-hop communications system, the method comprising:
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transmitting a power usage pattern for each relay node in a subset of relay nodes served by a communications controller, wherein the power usage pattern specifies transmit power levels for the relay node while the relay node is operating in a power control mode; receiving channel measurements of access links between each relay node in the subset of relay nodes and subscriber equipment served by the relay node; determining backhaul link transmit power levels and access link transmit power levels based on the channel measurements of access links and channel measurements of backhaul links between the communications controller and each relay node in the subset of relay nodes; and transmitting the access link power levels to the subset of relay nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for relay node operations, the method comprising:
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receiving a power usage pattern specifying transmit power levels for a relay node; transmitting a signal based on the power usage pattern to assist subscriber equipment served by the relay node in making channel measurements; receiving the channel measurements from the subscriber equipment; sending the channel measurements to a communications controller serving the relay node; receiving a transmit power level from the communications controller; and transmitting at the transmit power level to the subscriber equipment. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A communications controller comprising:
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a transmitter configured to transmit a power usage pattern for each relay node in a subset of relay nodes served by a communications controller, wherein the power usage pattern specifies transmit power levels for the relay node while the relay node is operating in a power control mode, and configured to transmit access link power levels to the subset of relay nodes; a receiver configured to receive channel measurements of access links between each relay node in the subset of relay nodes and subscriber equipment served by the relay node; and a processor coupled to the transmitter and to the receiver, the processor configured to determine backhaul link transmit power levels and access link transmit power levels based on the channel measurements of access links and channel measurements of backhaul links between the communications controller and each relay node in the subset of relay nodes. - View Dependent Claims (22, 23, 24)
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Specification