Abstract:
The present invention provides a method for detecting an uplink synchronization signal in a wireless access system supporting a high-frequency band, a method for designing a detection filter for the same and an apparatus for supporting the same. According to one embodiment of the present invention, a method for detecting a random access channel signal by a base station in a wireless access system supporting the high-frequency band comprises: allocating a cyclic shift value used in the base station; configuring a received signal vector for a signal transmitted via a random access channel; detecting at least one RACH signal from the received signal vector, using a frequency domain detecting filter; and identifying at least one terminal having transmitted at least one RACH signal, using a target terminal detecting filter, wherein the filter for detecting a target terminal may be set on the basis of the cyclic shift value.
Abstract:
A method for transmitting a reference signal by a base station to a user equipment in a wireless communication system is disclosed. The method includes transmitting the reference signal to the user equipment according to a first pattern corresponding to a first speed section, and if movement speed of the user equipment is changed to a second speed section from the first speed section, transmitting the reference signal to the user equipment according to a second pattern corresponding to the second speed section, wherein, if the second speed section is a higher-speed section than the first speed section, the second pattern includes the first pattern.
Abstract:
Disclosed are a BBU and a method of obtaining RRU information, which comprises, in a heterogeneous cell environment in which a macro cell and small cell coexist, a BBU receiving, from a terminal and via a serving RRU of the terminal connected to the BBU, a measurement reporting message that includes information on an RRU transmitting, to the terminal, a reference signal at an intensity equal to or stronger than a threshold value, and determining the RRU as a neighboring RRU of the serving RRU by using information included in the measurement reporting message.
Abstract:
The base station, receiving first pilot signals transmitted via each of multiple antennas of a user equipment (UE), selects one or more reference codebooks based on channel qualities of the received first pilot signals, and selects one or more sub-channels for each of the reference codebooks. Based on this, the base station determines one or more virtual channels, wherein each of the virtual channels comprises one reference codebook and the one or more sub channels selected for the one reference codebook, wherein the sub-channels are selected to minimum distance between corresponding virtual channel and corresponding reference codebook. And, the base station transmits antenna combining information to the UE, wherein the antenna combining information combines the multiple antennas of the UE into one or more antenna groups corresponding to the one or more virtual channels; and receive second pilot signals transmitted by the UE based on the antenna combining information.
Abstract:
A method for receiving a signal from a base station by a user equipment, using massive antenna array based beamforming of the base station in a wireless communication system is disclosed. The method includes receiving, from the base station, antenna shuffling information corresponding to a preferred antenna port set among a plurality of antenna ports included in the massive antenna array, measuring channel state information according to the antenna shuffling information and reporting the channel state information to the base station, and receiving, from the base station, a beamformed signal using the preferred antenna port set based on the channel state information, wherein the antenna shuffling information includes at least one of information about a start index of antenna ports included in the preferred antenna port set and information about a direction to which antenna port indexes are allocated.
Abstract:
The present invention relates to a wireless access system, and provides a method of transmitting and receiving cell information by using a synchronization signal in a small-cell layout environment and a device supporting the same. A method of transmitting cell information in a wireless access system as an embodiment of the present invention may include the steps of: configuring one or more pieces of cell information by means of a base station; configuring a downlink synchronization signal including one or more pieces of cell information by means of the base station; and broadcasting the downlink synchronization signal by means of the base station. In this case, the cell information is configured to be information different from the downlink synchronization information configured based on the downlink synchronization signal.
Abstract:
Disclosed herein is a method for, at a user equipment (UE), reporting velocity information to a base station for multi-antenna based beamforming in a wireless communication system. The method includes receiving a predefined signal from the base station, calculating at least one piece of movement velocity information of a vertical beamforming direction movement velocity vw and horizontal beamforming direction movement velocity vx of the UE based on the predefined information, and reporting the at least one piece of movement velocity information to the base station. The predefined signal is used to calculate a velocity vb of the UE in a direction of the base station.
Abstract:
A method for transmitting a signal to a receiver by a transmitter in a wireless communication system is disclosed. The method includes mapping one or more transmission steams to first logical antenna ports, mapping signals mapped to the first logical antenna ports to second logical antenna ports, and mapping signals mapped to the second logical antenna ports to physical antennas to transmit the signals mapped to the physical antennas to the receiver, wherein the number of the first logical antenna ports is less than or equal to the number of the second logical antenna ports and varies with a channel state between the transmitter and the receiver.
Abstract:
The present invention provides hierarchical modulation methods for robust symbol transmission and reception in a wireless access system, and devices supporting same. A method for transmitting a hierarchically modulated (HM) symbol in a wireless access system, according to an embodiment of the present invention, comprises the steps of: generating a first symbol; generating a second symbol; generating an HM symbol by combining the first symbol and the second symbol; and transmitting the HM symbol, wherein the first symbol can be generated by means of a spatial multiplexing (SM) technique, a beam-forming technique, or a space-time coding technique and the second symbol can be generated by means of a spatial multiplexing (SM) technique, a beam-forming technique, or a space-time coding technique.
Abstract:
A method and apparatus for beamforming using a polarized antenna in a wireless communication system are disclosed. The apparatus includes a processor configured to process a signal, and a multi-polarized antenna including a plurality of antenna elements, configured to transmit the signal. The plurality of antenna elements include an electric-field dipole antenna and a magnetic-field dipole antenna, and a current is applied to the electric-field dipole antenna and the magnetic-field dipole antenna in the same direction or in opposite directions.