Abstract: A method and a device for determining transmission power in a multi-antenna communication system are provided. The method for determining transmission power includes calculating the power consumption of a transmission device, calculating the capacity of the transmission device, and determining transmission power for maximizing the energy efficiency of the transmission device by using the power consumption and the capacity thereof.

Abstract: A central control apparatus and method thereof include a traffic demand receiving unit, a traffic demand calculating unit, a base station efficiency calculating unit, and a base station management unit. The traffic demand receiving unit is configured to receive a required traffic demand and a current location of each of terminals. The traffic demand calculating unit is configured to calculate traffic of each of base stations to which a terminal is unassigned. The base station efficiency calculating unit is configured to calculate an energy efficiency of each of the base stations. The base station management unit configured to verify a base station with an optimum energy efficiency, to activate the base station with the optimum energy efficiency, and to assign the terminals of a corresponding region to the base station with the optimum energy efficiency.

Abstract: A method of determining a number of antennas, includes calculating a power used by a transmitting device. The method further includes calculating a channel capacity of the transmitting device. The method further includes determining a number of antennas of the transmitting device to be used based on the power and the channel capacity.

Abstract: A method for determining a transmission power in a multi-input multi-output (MIMO) system based on a cooperative transmission is provided. The method includes setting a power constraint condition of a transmitter and target quality information of a receiver. The method further includes determining the transmission power to be allocated to the transmitter to transmit the data to the receiver based on the power constraint condition and the target quality information.

Abstract: Provided is a method and device for increasing energy efficiency by adaptively performing clipping with respect to an input signal. The method may adaptively determine a clipping ratio (CR) based on a modulation method of the communication device and perform clipping based on the determined CR.

Abstract: Methods and apparatus for reducing a peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal in an MIMO-OFDM communication system is provided, in which the method for reducing the PAPR of the OFDM signal may identify interference generated in an MIMO communication system, and adjust a clipping ratio (CR) for an effect of a clipping distortion to be less than an effect of interference.

Abstract: Provided is an apparatus and method for managing a power consumption of a transmitter based on energy efficiency in a multiple-input and multiple-output (MIMO) communication system. The transmitter is configured to control a power of at least one of a baseband (BB) component, a radio frequency (RF) chain component, and a power amplifier (PA) component based on calculation of the energy efficiency.

Abstract: Provided are a mobile network control apparatus and energy saving method. The mobile network control apparatus for may calculate a first amount of total consumed power consumed by m base stations to provide a first cell as a coverage range, and a second amount of total consumed power consumed by n base stations to provide a second cell including the first cell as a coverage range. The mobile network control apparatus may save energy by initiating an operation of the n base stations on a high power mode, and by suspending an operation of a remaining base station excluding the n base stations if the first amount of total consumed power is greater than the second amount of total consumed power.

Abstract: A method for determining a transmission power in a multi-input multi-output (MIMO) system based on a cooperative transmission is provided. The method includes setting a power constraint condition of a transmitter and target quality information of a receiver. The method further includes determining the transmission power to be allocated to the transmitter to transmit the data to the receiver based on the power constraint condition and the target quality information.

Abstract: A method for determining a transmission power in a multi-input multi-output (MIMO) system based on a cooperative transmission is provided. The method includes setting a power constraint condition of a transmitter and target quality information of a receiver. The method further includes determining the transmission power to be allocated to the transmitter to transmit the data to the receiver based on the power constraint condition and the target quality information.

Abstract: A system for saving energy through control of a sleep mode, and a method of operating the system are provided. The energy-saving system may enable a proxy device to maintain a minimum basic setup necessary for a communication when a host device enters a sleep mode, and may omit an operation performed based on the basic setup when the host device switches to a communication mode, thereby enabling a smooth switch between the sleep mode and the communication mode.

Abstract: Provided is an apparatus and method for managing a power consumption of a transmitter based on energy efficiency in a multiple-input and multiple-output (MIMO) communication system. The transmitter is configured to control a power of at least one of a baseband (BB) component, a radio frequency (RF) chain component, and a power amplifier (PA) component based on calculation of the energy efficiency.

Abstract: A method and a device for determining transmission power in a multi-antenna communication system are provided. The method for determining transmission power includes calculating the power consumption of a transmission device, calculating the capacity of the transmission device, and determining transmission power for maximizing the energy efficiency of the transmission device by using the power consumption and the capacity thereof.

Abstract: A method and apparatus for user scheduling in a multi-user multiple input multiple output (MIMO) communication system are provided. The method includes identifying a user group comprising user terminals. The method further includes comparing power consumptions based on the user group. The method further includes scheduling the user terminals based on the comparing.

Abstract: Methods and apparatus for reducing a peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal in an MIMO-OFDM communication system is provided, in which the method for reducing the PAPR of the OFDM signal may identify interference generated in an MIMO communication system, and adjust a clipping ratio (CR) for an effect of a clipping distortion to be less than an effect of interference.

Abstract: A method of determining whether to switch off a base station's own power in the base station within a cellular network may comprise: receiving terminal messages having real number values from terminals within cell coverage of the base station; calculating real number values of base-station messages individually regarding the terminals based on the received terminal messages; transmitting the base-station messages having the calculated real number values individually to the terminals; repeatedly performing the receiving, the calculating, and the transmitting until the calculated real number values of the base-station messages are converged to constant values; when the real number values of the base-station messages are converged, calculating a base-station message convergence value, which is one real number value regarding the terminals, based on the converged real number values of the terminal messages; and/or determining whether to switch off the base station's own power based on the base-station message con

Abstract: A central control apparatus and method thereof include a traffic demand receiving unit, a traffic demand calculating unit, a base station efficiency calculating unit, and a base station management unit. The traffic demand receiving unit is configured to receive a required traffic demand and a current location of each of terminals. The traffic demand calculating unit is configured to calculate traffic of each of base stations to which a terminal is unassigned. The base station efficiency calculating unit is configured to calculate an energy efficiency of each of the base stations. The base station management unit configured to verify a base station with an optimum energy efficiency, to activate the base station with the optimum energy efficiency, and to assign the terminals of a corresponding region to the base station with the optimum energy efficiency.

Abstract: A method of determining a number of antennas, includes calculating a power used by a transmitting device. The method further includes calculating a channel capacity of the transmitting device. The method further includes determining a number of antennas of the transmitting device to be used based on the power and the channel capacity.

Abstract: A method and apparatus for performing a multiple Pre-Shared Key (PSK) based authentication in a single procedure is described, where the multiple PSK based authentication generates a combined credential in a terminal by using a plurality of credentials including a user identifier and the PSK, and authenticates the terminal in an authentication server by using the combined credential.

Abstract: A method and apparatus for user scheduling in a multi-user multiple input multiple output (MIMO) communication system are provided. The method includes identifying a user group comprising user terminals. The method further includes comparing power consumptions based on the user group. The method further includes scheduling the user terminals based on the comparing.