Abstract:
The present invention relates to a method in which a signal is transmitted between a base station and a terminal in a multi-antenna wireless communication system. The method transmits pre-estimated channel information to the terminal when the terminal moves to a specific position when channel estimation for a specific position is performed. As for the terminal which moves along a fixed route or the route of which can be estimated, the position of the terminal in the near future can be easily detected. Therefore, the transception of channel information can be performed in a more efficient manner in consideration of the above-described special environment.
Abstract:
A method for performing handover at a mobile terminal which moves along an established path in a wireless communication system includes transmitting an indicator indicating a handover type to a serving base station without performing measurement with respect to neighboring base stations and movement path information and transmitting current position information of the mobile terminal to the serving base station.
Abstract:
A method for estimating a location of a mobile station includes transmitting a position request signal, including at least departure time information or an identifier of the mobile station, to an AP by synchronizing with the AP, receiving first position information, including at least a calculated first location of the mobile station or a calculated first distance between the mobile station and the AP and departure time information of a position response signal, from the AP, calculating a ToA of a signal between the mobile station and the AP based on the departure time information of the position response signal, calculating at least a second distance between the mobile station and the AP or a second location of the mobile station using the ToA, and determining a final location of the mobile station based on the first position information and at least the second distance or the second location.
Abstract:
A method and apparatus for transmitting an uplink signal in a wireless communication system are disclosed. A transmission apparatus for receiving an uplink (UL) signal from a user equipment (UE) and transmitting the received UL signal to a base station (BS) in a wireless communication system includes: a plurality of reception antennas configured to receive UL signals from the UE; a radio frequency (RF) repeater configured to amplify and map the received UL signals to at least one transmission antenna; and a plurality of transmission antennas configured to transmit the amplified UL signals to the BS, wherein the RF repeater is configured to select M received UL signals from among a plurality of received UL signals which are received in the plurality of reception antennas, and map the M received UL signals to N transmission antennas from among the plurality of transmission antennas, and the number of the reception antennas (Nrx,REP) is higher than the number of the transmission antennas (Ntx,REP), and N is the number of the transmission antennas which is used to transmit the M received UL signals.
Abstract:
The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for virtualizing an antenna. A method for communicating using a virtual antenna of a terminal in the wireless communication system, according to one embodiment of the present invention, comprises the steps of: configuring one or more virtual antennas according to an antenna virtualization pattern that is determined based on information indicating a movement status of the terminal and/or information indicating a communication status of the terminal; and communicating with the base station by using the one or more virtual antennas, wherein one or more physical antennas that are mapped to the one or more virtual antennas can be determined base on the direction of movement of the terminal.
Abstract:
A method and apparatus for transmitting a downlink signal in a wireless communication system are disclosed. An apparatus for receiving a downlink (DL) signal from a base station (BS) and transmitting the received DL signal to a user equipment (UE) in a wireless communication includes: a plurality of reception antennas configured to receive DL signals from the BS; a processor configured to map the received DL signals to at least one transmission antenna; and a plurality of transmission antennas configured to transmit the received DL signals to the UE, wherein the processor is configured to select M transmission antenna(s) from among the plurality of transmission antennas (Ntx,REP Tx antennas), and map the received L signals to the M transmission antenna(s), and the number of the transmission antennas (Ntx,REP) is higher than the number of the reception antennas (Nrx,REP), and M is the number of the transmission antennas which is used to transmit the received DL signals.
Abstract:
The present invention relates to a method in which a signal is transmitted between a base station and a terminal in a multi-antenna wireless communication system. The method transmits pre-estimated channel information to the terminal when the terminal moves to a specific position when channel estimation for a specific position is performed. As for the terminal which moves along a fixed route or the route of which can be estimated, the position of the terminal in the near future can be easily detected. Therefore, the transception of channel information can be performed in a more efficient manner in consideration of the above-described special environment.
Abstract:
A method and apparatus for performing effective feedback in a wireless communication system supporting multiple antennas. A method for transmitting CSI of downlink transmission via uplink in a wireless communication system includes transmitting a joint-coded rank indicator (RI) and a first wideband (WB) precoding matrix indicator (PMI) at a first subframe, and transmitting a wideband channel quality indicator (WB CQI) and a second WB PMI at a second subframe. A user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI. If the RI is Rank-1 or Rank-2, the first PMI indicates one of subsets each having 8 indexes from among 16 indexes of the first PMI of a precoding codebook.
Abstract:
Proposed are a method and apparatus for performing sensing in a wireless LAN system. In detail, a first STA broadcasts a sensing request frame. The first STA receives a first sensing response frame form a second STA and receives a second sensing response frame from a third STA. The sensing request frame includes STA identifier information and RU allocation information. The STA identifier information includes identifiers of the second and third STAs. The RU allocation information includes information about a first RU allocated to the second STA and information about a second RU allocated to the third STA. The first sensing response frame is received through the first RU. The second sensing response frame is received through the second RU.
Abstract:
One embodiment according to the present specification relates to a technique for transmitting information related to a packet extension field in a wireless LAN (WLAN) system. An NGV PPDU can include at least one midamble and a packet extension field set on the basis of the at least one midamble. For example, a duration related to the packet extension field can be set on the basis of the number of the at least one midamble. A preamble of the NGV PPDU can include information related to a packet extension field.