Abstract: A method and apparatus for transmitting a signal to a terminal are provided. The method includes: determining at least one of a plurality of resource blocks (RBs) of a frequency resource and a time resource in a subframe that transmits to the terminal; allocating a power rate to each of a first signal and a second signal to transmit to the terminal; and transmitting the first signal and the second signal through the RB according to the allocated power rate.

Abstract: A method and an apparatus for receiving a signal in a high-speed mobile network are provided. In the case of receiving, by a moving terminal in a high-speed mobile network environment, signals transmitted from a plurality of base stations, a signal received through one antenna is decoded to generate a first symbol corresponding to a first signal transmitted from a first base station. The first symbol is subtracted from the received signal to acquire a modified received signal, and the modified received signal is decoded to generate a second symbol corresponding to a second signal transmitted from a second base station.

Abstract: A wireless communication method and apparatus in a wireless local area network (WLAN) system are disclosed. A wireless communication method according to one embodiment may include generating a high-efficiency Wi-Fi (HEW) frame including at least one of an HEW-SIG-A field and an HEW-SIG-B field which include channel information for communications according to an Orthogonal Frequency-Division Multiple Access (OFDMA) mode, and transmitting the generated HEW frame to a reception apparatus.

Abstract: A method and apparatus for simultaneously transmitting data to a plurality of terminals are provided. The method includes: selecting a plurality of simultaneous transmitting terminals based on a signal-to-noise ratio (SNR) of the plurality of terminals; allocating a power rate of the plurality of simultaneous transmitting terminals to each of the plurality of simultaneous transmitting terminals; modulating each of the data according to a modulation method that is determined based on the power rate; and transmitting the modulated data according to the power rate.

Abstract: Provided is a method for generating, by a base station, a common signal commonly required for surrounding terminals of the base station in a massive multiple input multiple output (MIMO) system. The base station generates data commonly required for the surrounding terminals. The base station generates a plurality of beamforming vectors using a time-domain constant amplitude (TCA)-frequency-domain constant amplitude (FCA) sequence having a constant size in a time domain and a frequency domain. Further, the base station generates a plurality of antenna streams corresponding to the common signal by multiplying the plurality of beamforming vectors by the data.

Abstract: A method and an apparatus for beam-space multi-input multi-output (MIMO) transmission based load-modulation are disclosed. The apparatus for beam-space MIMO transmission includes: a plurality of impedance loading circuits each including a plurality of imaginary number impedance elements; a beam-space MIMO control unit calculating loading values of the plurality of imaginary number impedance elements in response to a spatial multiplexing signal; and an RF chain unit generating a first signal having a predetermined carrier frequency.

Abstract: The present application relates to a method of generating a downlink frame. The method of generating the downlink frame includes: generating a first short sequence and a second short sequence indicating cell group information; generating a first scrambling sequence and a second scrambling sequence determined by the primary synchronization signal; generating a third scrambling sequence determined by the first short sequence and a fourth scrambling sequence determined by the second short sequence; scrambling the short sequences with the respective scrambling sequences; and mapping the secondary synchronization signal that includes the first short sequence scrambled with the first scrambling sequence, the second short sequence scrambled with the second scrambling sequence and the third scrambling sequence, the second short sequence scrambled with the first scrambling sequence and the first short sequence scrambled by the second scrambling sequence and the fourth scrambling sequence to a frequency domain.

Abstract: Provided are a method and apparatus for controlling a plurality of base stations disposed along the moving path of a moving group object, including determining a frame offset for the plurality of base stations based on a first delay time generated between the moving group object and the plurality of base stations and a second delay time generated between the plurality of base stations and the base station control device, and transferring data to be transmitted to the moving group object to the plurality of base stations based on the frame offset.

Abstract: Provided is an operation method of a station (STA) in a wireless local area network (WLAN). The operation method includes generating a legacy preamble, generating a high efficiency (HE) preamble including scheduling information for a plurality of receiving STAs, and generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) including the legacy preamble, the HE preamble, and a payload.

Abstract: Disclosed are a frame transmission method using a selective beamforming and a communication apparatus to perform the frame transmission method. The communication apparatus may determine a beamforming matrix based on classification information in which a plurality of subcarriers used for communication is classified into a plurality of frequency units, may map a long training field (LTF) sequence to the beamforming matrix, and transmit a beamforming training (BF-T) frame including the mapped LTF sequence to a plurality of stations, may receive, from the plurality of stations having receiving the BF-T frame, feedback information generated based on a reception strength of the BF-T frame, and may allocate frequency units to data frames to be transmitted to the plurality of stations based on the feedback information, and transmit the data frames using the allocated frequency units. The reception strength of the BF-T frame may be determined at each station for each frequency unit.

Abstract: A signal transmitting method according to an exemplary embodiment of the present invention includes channel-coding broadcasting channel information by using a first scrambling code in a first frame within a broadcasting channel information updating period including a plurality of frames, and channel-coding the broadcasting channel information by using a second scrambling code in a second frame within the broadcasting channel information updating period. The second scrambling code is different from the first scrambling code.

Abstract: A transmitting apparatus may comprise a symbol mapper; a first DFT and a second DFT performing DFT spreading on symbols mapped in the symbol mapper; and a subcarrier mapper mapping symbols which are DFT-spread in the first DFT and the second DFT to subcarriers, wherein the first DFT performs DFT spreading on all resource blocks to be transmitted when a total size of the resource blocks to be transmitted is a size which can be processed by the first DFT, or the first DFT performs DFT spreading on as many resource blocks among the resource blocks to be transmitted as the first DFT can process and the second DFT performs DFT spreading on the rest of the resource blocks to be transmitted when a total size of the resource blocks to be transmitted is not a size which can be processed by the first DFT.

Abstract: Provided are a machine type communication (MTC) support method and apparatus capable of providing efficient MTC service. First, when a base station transmits a subframe to which an MTC-physical control format indicator channel (PCFICH) is allocated using an MTC-PCFICH code that is cyclic-shifted on the basis of a control format indicator (CFI) to MTC user equipment (UE), the MTC UE detects the MTC- PCFICH from the received subframe by performing blind decoding of a cyclic shift, and detects a region occupied by a legacy physical downlink control channel (PDCCH) on the basis of the detected MTC-PCFICH. Accordingly, it is possible to support efficient MTC service in a Third Generation Partnership Project (3GPP) Long Term Evolution (LTE)-based mobile communication system while maintaining compatibility with a legacy LTE station.

Abstract: Provided is a data frame transmission method of a communication apparatus, the method including determining whether a transmission allowance condition of a data frame of the communication apparatus is satisfied when another communication apparatus occupies a channel, verifying an end time of another data frame transmitted by the other communication apparatus based on a result of the determining, and transmitting the data frame based on the verified end time.

Abstract: The present application relates to a method of generating a downlink frame. The method of generating the downlink frame includes: generating a first short sequence and a second short sequence indicating cell group information; generating a first scrambling sequence and a second scrambling sequence determined by the primary synchronization signal; generating a third scrambling sequence determined by the first short sequence and a fourth scrambling sequence determined by the second short sequence; scrambling the short sequences with the respective scrambling sequences; and mapping the secondary synchronization signal that includes the first short sequence scrambled with the first scrambling sequence, the second short sequence scrambled with the second scrambling sequence and the third scrambling sequence, the second short sequence scrambled with the first scrambling sequence and the first short sequence scrambled by the second scrambling sequence and the fourth scrambling sequence to a frequency domain.

Abstract: A method of and an apparatus therefor searching a cell in a mobile station of a communication system in which a plurality of cells are grouped into a plurality of cell groups, and each cell group includes at least two cells. The method includes detecting a primary synchronization signal and a secondary synchronization signal from a received signal, and identifying a cell based on a combination of the primary synchronization signal and the secondary synchronization signal. The secondary synchronization signal is related to the cell group to which the mobile station belongs and the primary synchronization signal is related to the cell to which the mobile station belongs within the cell group.

Abstract: Disclosed is a protocol for transmitting data through cooperation between access points in an overlapped basic service set (OBSS) environment. A cooperative beamforming communication method may include negotiating, by a first access point, a cooperative transmit beamforming with a second access point having an OBSS area with the first access point; transmitting, by the first access point, a clear-to-send (CTS) to the second access point; and performing, by the first access point, the cooperative transmit beamforming with the second access point during a cooperative transmit beamforming duration determined through the negotiation after a predetermined time interval is elapsed, when transmission of the CTS is completed.

Abstract: For a transmitting terminal which is connected to a small base station of a small cell to transmit data to a receiving terminal belonging to another small cell, information of the receiving terminal to a target small base station to which the receiving terminal is connected is received from a small base station; when handover to the target small base station may be made, the handover to the target small base station is made depending on a handover instruction from the small base station and then data are transmitted to the receiving terminal through the target small base station.

Abstract: A signal transmitting method according to an exemplary embodiment of the present invention includes channel-coding broadcasting channel information by using a first scrambling code in a first frame within a broadcasting channel information updating period including a plurality of frames, and channel-coding the broadcasting channel information by using a second scrambling code in a second frame within the broadcasting channel information updating period. The second scrambling code is different from the first scrambling code.

Abstract: A signal transmitting method according to an exemplary embodiment of the present invention includes channel-coding broadcasting channel information by using a first scrambling code in a first frame within a broadcasting channel information updating period including a plurality of frames, and channel-coding the broadcasting channel information by using a second scrambling code in a second frame within the broadcasting channel information updating period. The second scrambling code is different from the first scrambling code.