Abstract:
The present invention relates to a wireless communication system. The method whereby a terminal receives a synchronizing signal in a wireless communication system according to one embodiment of the present invention may comprise the steps of: receiving location information on a domain, from which the synchronizing signal is transmitted, among domains resulting from the division of the whole system bandwidth into N parts along a frequency axis and into M parts along a time axis (wherein N and M are natural numbers); and receiving the synchronizing signal from the domain corresponding to the location information.
Abstract:
A method and apparatus for establishing a device-to-device (D2D) connection in a wireless communication system is provided. A first device may establish the D2D connection with a second device. The first device only knows information on neighbor devices of the first device, and a network does not know the information on neighbor devices of the first device. The first device determines whether to establish the D2D connection with the second device or not, based on at least one of a proximity between the first device and the second device based on a profile of the second device obtained through a neighbor discovery procedure, a presence of data to be transmitted to the second device, and a preference for the D2D connection of the first device.
Abstract:
The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for transmitting a codebook-based signal. A method for transmitting channel state information from a terminal in the wireless communication system, according to one embodiment of the present invention, comprises the steps of: measuring a downlink channel from a downlink signal that is received from a base station; determining a first precoding matrix indicator (PMI) and a second PMI of the downlink channel based on the measurement of the downlink channel; and transmitting the first PMI and the second PMI to the base station, wherein the first PMI indicates a first precoding vector that includes a first elevation angle component of a multi-antenna of the base station, the second PMI indicates a second precoding vector that includes a second elevation angle component and an azimuth angle component of the multi-antenna of the base station, and wherein resolution of the azimuth angle component can be determined based on the first elevation angle component or the second elevation angle component.
Abstract:
A method and a user equipment (UE) for network attachment are disclosed. The method includes receiving first status information associated with one or more remote radio units (RRUs) for supporting the small cell from the one or more RRUs, receiving second status information associated with one or more macro cells from one or more macro eNBs for supporting the macro cell, selecting an RRU and macro eNB, which the UE wants to attach, among the one or RRUs based on the first status information and the second status information, and simultaneously transmitting an attach request message for requesting network attachment from the selected RRU and macro eNB to the selected RRU and macro eNB.
Abstract:
The present invention relates to a method of configuring a user equipment-based communication area in a cloud radio access network environment and an apparatus therefor. As one embodiment of the present invention, a method of performing a communication, which is performed by a user equipment (UE) in a cloud radio access network environment includes the steps of generating an RRU list based on signal strength of downlink signals received from each of one or more RRUs (remote resource unit), setting a UE-based communication area in a manner of transmitting the RRU list to a BBU (base band unit) via a first RRU among the one or more RRUs and establishing an RRC connection with a second RRU within the UE-based communication area.
Abstract:
A method for performing fractional beamforming using a massive antenna array at a Base Station (BS) in a wireless communication system is disclosed. The method includes dividing the massive antenna array by rows or by columns into partitions, receiving feedback information about the partitions from a User Equipment (UE), determining sub-precoders for the partitions based on the feedback information, and transmitting a signal to the UE by performing beamforming using the sub-precoders and a linking precoder that links the partitions to each other.
Abstract:
A method and apparatus for establishing, by a first device, a device-to-device (D2D) connection with a second device in a wireless communication system is provided. When the D2D connection is initiated by a network, the first device receives a D2D broadcast configuration message including information on the second device, from the network, and determines whether to establish the D2D connection with the second device or not. Or, when the D2D connection is initiated by the first device, the first device determines whether to establish the D2D connection with the second device or not, based on at least one of a proximity between the first device and the second device based on a profile of the second device obtained through a neighbor discovery procedure.
Abstract:
A method and user equipment (UE) for transmitting a signal to a base station in a multi-antenna wireless communication system are discussed. The method can include mapping interleaver input vector sequences to an interleaver matrix, wherein each of the interleaver input vector sequences comprises vectors having a bit size of NL·Qm, wherein Qm is a modulation order and NL is a number of transmission layers, reading out the interleaver matrix column by column for obtaining output bit sequences, and transmitting the output bit sequences through the transmission layers to the base station.
Abstract:
A method and apparatus for transmitting a Reference Signal (RS) during retransmission at a User Equipment (UE) in a multi-antenna wireless communication system are disclosed. The RS transmission method includes receiving an uplink grant from a Base Station (BS), initially transmitting data and an RS corresponding to each layer based on the uplink grant, receiving ACKnowledgment/Negative ACKnowledgment (ACK/NACK) information for the initially transmitted data, and retransmitting the RS corresponding to each layer and the data according to the ACK/NACK information. The retransmission includes initializing a cyclic shift value for the RS corresponding to each layer according to a cyclic shift field for RSs included in the uplink grant.
Abstract:
The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for transmitting a codebook-based signal. A method for transmitting channel state information from a terminal in the wireless communication system, according to one embodiment of the present invention, comprises the steps of: measuring a downlink channel from a downlink signal that is received from a base station; determining a first precoding matrix indicator (PMI) and a second PMI of the downlink channel based on the measurement of the downlink channel; and transmitting the first PMI and the second PMI to the base station, wherein the first PMI indicates a first precoding vector that includes a first elevation angle component of a multi-antenna of the base station, the second PMI indicates a second precoding vector that includes a second elevation angle component and an azimuth angle component of the multi-antenna of the base station, and wherein the second elevation angle component can be determined based on the value of the first elevation angle component.