Abstract:
The present invention relates to a method for increasing the resource utilization rate and reducing power consumption in a high-speed wireless communication system and a control device. The method according to one embodiment of the present invention comprises a process for efficient utilization of a frequency band by including channel state information and data frame mode information in a request frame or an ack frame, before transmission in a wireless communication system. The method according to one embodiment of the present invention relates to a power saving method in a wireless communication system having at least two different transmission modes, the method comprising: a process of setting a mode in such a manner that a control frame is received in a mode with the lowest sampling speed out of three different modes available and then receiving the control frame in the set mode; and a process of setting a mode, after receiving the control frame, in such a manner that a data packet is transmitted / received in a mode with the highest transmission rate and then transmitting / receiving the data packet in the set mode.
Abstract:
Disclosed is a cooperative relay station that relays between a base station and a mobile station when retransmitting a signal. Also, disclosed is a base station that receives a signal from a mobile station in mutual cooperation with the cooperative relay station. After the cooperative relay station receives and decodes a signal that the mobile station transmits to the base station or a service relay station, if an error of the decoded signal does not exist, it stores the received signal. If an error occurs when the base station decodes the signal that the mobile station transmits, the base station requests retransmission for the signal with the error to the cooperative relay station. If the cooperative relay station gets a request of retransmission, it transmits the signal that the base station requests to the base station. In this was, since an error rate may be reduced when the base station requests retransmission of the signal, resource reuse efficiency may become improved, interference may be reduced, and it is easy to adapt to a service being sensitive to time delay.
Abstract:
Disclosed is a technique related to a method for controlling synchronization by correcting data transmission time or frequency offset, and to a station. According to the technique, a method for controlling the synchronization of a first terminal for data transmission/reception in a coordinated communication system comprises: a step of transmitting a first request frame and a second request frame containing transmission time information for each of a first response frame and a second response frame to a second terminal and to a third terminal, respectively; a step of receiving the first response frame and the second response frame from the second terminal and the third terminal; a step of estimating a first propagation delay time between the first terminal and the second terminal and a second propagation delay time between the first terminal and the third terminal, using the time of receiving the first response frame and the second response frame; and a step of transmitting, to the second terminal, a third request frame containing information on the delay time difference between the first propagation delay time and the second propagation delay time.
Abstract:
The present invention relates to transmitting/receiving apparatuses of a wideband radio channel measuring device using a multi-carrier. The wideband radio channel measuring device using the multi-carrier may measure radio channel characteristics at a frequency domain. Since the radio channel is measured at the frequency domain by the wideband radio channel measuring device using the multi-carrier, the channel characteristics may be simultaneously measured while maintaining a maximum Doppler measurement frequency at a predetermined level regardless of increase of the number of transmitting and receiving antennas, in an MIMO configuration.
Abstract:
The present invention relates to a coordinator communication method, comprising: receiving a relay search request frame for requesting the search for at least one relay device between a destination device and a source device; and transmitting a relay search response frame including a list of the at least one relay device in response to the relay search request frame, whereby the source device is able to select a target relay device from the at least one relay device.
Abstract:
Disclosed is a technique relating to a method for sending and receiving data on a cooperative communications system and a cooperative communications method providing improved diversity gain and throughput. Disclosed is a method of source node data transmission on a cooperative communications system, comprising the steps of: beamforming towards a relay node; transmitting data to the relay node; beamforming towards a destination node; and transmitting the data to the destination node.
Abstract:
Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence.
Abstract:
The present invention relates to a method and to an apparatus for configuring a communication system that supports the discontinuous operation of a base station. A method for controlling the operation of a base station in a wireless communication system according to one embodiment of the present invention comprises the steps of: checking whether or not a permitted mobile equipment exists in the coverage area of the base station and in all the coverage areas of neighboring base stations of said base station; and controlling the base station to operate in a first discontinuous mode by a predetermined cycle if said permitted mobile equipment does not exist in the coverage area of the base station and in all of the coverage areas of the neighboring base stations.
Abstract:
The present invention relates to a decoding method and a decoding device for detecting a transmission signal in a multiple-input multiple-output (MIMO) system. In the method, a sorted QR decomposition for calculating a unitary matrix and an upper triangular matrix, the received signal is multiplied by a transpose matrix of the unitary matrix to calculate a vector, an initial detection lattice point and a minimum eigenvalue is calculated from the vector and the upper triangular matrix, and a maximum likelihood point is detected by using the initial detection lattice point and the minimum eigenvalue. In addition, a transmission signal detecting device includes a QR decomposition unit for performing a sorted QR decomposition for the received signal, a vector calculating unit for calculating a vector by multiplying the received signal by a transpose matrix of a unitary matrix, an initial detection lattice point detecting unit for calculating an initial detection lattice point, an eigenvalue extractor for calculating a minimum eigenvalue, and a maximum likelihood point detecting unit for detecting a maximum likelihood point by using the initial detection lattice point and the minimum eigenvalue.
Abstract:
Un método para acceder a un canal en una red de área local inalámbrica, que comprende: recibir, mediante una estación de destino, una pluralidad de tramas de petición para enviar, RTS, para asignar un vector de asignación de red desde una estación fuente a través de una primera banda; y transmitir, mediante la estación de destino, una trama de liberación para enviar, CTS, a través de una segunda banda a la estación fuente en respuesta a la pluralidad de tramas de RTS, en el que la primera banda incluye una pluralidad de primeras bandas de 20 MHz , correspondiendo cada una de la pluralidad de tramas de RTS a cada una de la pluralidad de primeras bandas de 20 MHz, en el que la segunda banda incluye una segunda banda de 20 MHz, en el que el número de la segunda banda de 20 MHz es igual a o menor que el número de la pluralidad de primeras bandas de 20 MHz, caracterizado por que cada una de la pluralidad de tramas de RTS incluye información de modo de transmisión que indica un ancho de banda completo de la pluralidad de primeras bandas de 20 MHz.