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US 8,711,739 B1Granted
Subcarrier cluster-based power control in wireless communications
AssigneeZTE (USA) Inc.
InventorsSean Cai, Jason Hou, Jing Wang, Dazi Feng, Mary Chion, Jun Han
Life of this patent
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Abstract
Devices, systems and techniques to monitor signal fading based on a cluster of subcarriers at a receiver and feedback monitored signal fading to a transmitter in wireless communication systems such as OFDM and OFDMA systems.
Claims19
A method for controlling power in a wireless communication system based on OFDM or OFDMA, comprising:
- monitoring a cluster signal parameter of each of a plurality of clusters of sub-carriers at a receiver, wherein each cluster comprises a set of sub-carriers that are sequential in frequency and the cluster signal parameter indicates signal fading of the cluster as a whole;
- feeding information of the cluster signal parameter of a selected cluster as a whole, without signal fading information of each individual subcarrier in that cluster, back to a transmitter that produces and transmits sub-carriers received by the receiver;
- and
- controlling the transmitter to:
- increase transmit power of at least one cluster when the cluster signal parameter of the one cluster is below a first threshold;
- and
- upon increasing the transmit power of the at least one cluster, reduce the transmit power of the at least one cluster using a decay factor when the cluster signal parameter of the one cluster is not below the threshold.
4 more elements
A communication system, comprising:
- a plurality of base stations spatially distributed to wirelessly communicate with subscriber stations via radio links that comprise OFDM or OFDMA sub-carriers;
- a plurality of base station controllers, each coupled to control and communicate with the plurality of base stations;
- a monitoring mechanism to monitor signal fading of each of a plurality of clusters of sub-carriers at a receiver, wherein each cluster comprises a set of sub-carriers that are sequential in frequency and the signal fading indicates signal fading of the cluster as a whole;
- a communication mechanism to feed information of the signal fading of a cluster, without signal fading information of each individual subcarrier in each cluster, to a transmitter that produces and transmits the clusters of sub-carriers;
- and
- a control mechanism to control the transmitter in response to the signal fading to:
- increase power of at least one cluster of sub-carriers when the signal fading reaches a signal fading threshold;
- and
- upon increasing the transmit power of the at least one cluster, reduce the transmit power using a decay factor when the cluster signal parameter of the one cluster is not below the signal fading threshold.
6 more elements
A method for controlling power in a wireless communication system based on Orthogonal Frequency Division Multiplexing or Orthogonal Frequency Division Multiplexing Access, comprising:
- independently controlling transmitted power of each of a plurality of clusters of sub-carriers at a transmitter, wherein each cluster comprises a set of sub-carriers that are sequential in frequency;
- receiving information of a cluster signal parameter of a selected cluster as a whole, without receiving signal fading information of each individual subcarrier in the selected cluster;
- and
- controlling a transmitted signal power of the selected cluster to:
- increase transmit power when the cluster signal parameter of the selected cluster is below a threshold;
- and
- upon increasing the transmit power of the at least one cluster, reduce the transmit power using a decay factor when the cluster signal parameter of the selected cluster is not below the threshold.
4 more elements
Dependencies are inferred from the claim text.