Method and system for providing load-balanced communication
AssigneeNortel Networks Limited
InventorsBassam M. Hashem, Shalini S. Periyalwar, Anatoli Kotov
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Abstract
A method and system for selecting a station, in a communication system having a plurality of stations, for communication with a device based on station load conditions is provided. A plurality of base stations determine their station load condition. Station transmit power level is adjusted for at least a part of a transmitted signal in each of the plurality of stations in accordance with the respective determined station load condition. A device receives the transmitted signal from at least one of the plurality of stations and selects a station for communication. The station selection is made by the device based at least in part on a received power level of the adjusted portion of the transmitted signal.
Claims35
A substantially load-balanced communication system, comprising:
- at least one station, each station:
- determining the station load condition for each of the plurality of stations;
- and
- adjusting station transmit power level for at least a part of a transmitted signal in accordance with the respective determined station load condition, the station transmit power level being adjusted to substantially balance the station load conditions among the at least one station;
- and
- at least one device, each device:
- receiving the transmitted signal from the at least one station;
- and
- selecting a station for communication, the station selection being made by the device based at least in part on a received power level of the adjusted portion of the transmitted signal
- the selected station:
- receiving a carrier to interference power ratio from the device;
- scaling the received carrier to interference power ratio to take into account the adjusted station transmit power level, and
- determining a signal coding and modulation scheme based on the scaled received
- carrier to interference power ratio.
A device for communication with one or more base stations, the device comprising:
- a receiver, the receiver receiving a first signal from at least one of the base stations the first signal including an adjusted power level of at least one subcarrier comprised of a pilot signal, the first signal further including at least one other subcarrier being a data signal transmitted at a power level different than the pilot signal;
- a central processing unit in operative communication with the receiver, the central processing unit:
- determining a carrier to interference power ratio for each of the received first signals, the carrier to interference ratio being based, at least in part, on a loading condition of the base station transmitting the corresponding first signal, the power level of one of the pilot signal and the data signal being adjusted based on the loading condition;
- and
- selecting a base station for data communication based on the determined carrier to interference power ratios.
A method for selecting a station, in a communication system having a plurality of stations, for communication with a device, based on a station load condition of the respective stations, comprising:
- determining the station load condition for each of the plurality of stations;
- adjusting station transmit power level for at least a part of a transmitted signal in each of the plurality of stations in accordance with the respective determined station load condition, the part of the transmitted signal for which transmit power is adjusted being at least one subcarrier of the transmitted signal comprised of a pilot signal and at least one other subcarrier being a data signal transmitted at a power level different than the pilot signal;
- receiving the transmitted signal from at least one of the plurality of stations;
- and
- selecting a station for communication, the station selection being made by the device based at least in part on a received power level of the adjusted portion of the transmitted signal.
A base station for communication with a device, the base station comprising:
- a transmitter transmitting a first signal to the device;
- a central processing unit, the central processing unit controlling the transmitter by:
- determining a base station load condition;
- and
- adjusting station transmit power level for at least a part of the first signal for transmission to the device, the station transmit power being adjusted in accordance with the determined station load condition, the part of the transmitted signal for which transmit power is adjusted being at least one subcarrier of the transmitted signal comprised of a pilot signal and at least one other subcarrier being a data signal transmitted at a power level different than the pilot signal.
Dependencies are inferred from the claim text.