Abstract:
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). A method for receiving transmission beam (Tx beam) information by a user equipment (UE) in a communication system supporting a multi-user multi-input multi-output (MU-MIMO) scheme is provided. The method includes transmitting information on a selected Tx beam to a base station (BS), and receiving Tx beam information including information for a Tx beam selected by at least one UE other than the UE from the BS.
Abstract:
User Equipment, UE (30), in a wireless radiocommunication network (10) supporting Coordinated Multi-Point, CoMP, transmissions may autonomously adopt an assumption of the quasi co-located (QCL)status of two (or more) antenna ports that is different from the default QCL status defined or signaled by the network (10), in response to one or more estimates of certain operating parameter values. The altered QCL status assumption allows the UE (30) to correct parameter estimates more accurately, and/or to reduce complexity in the parameter estimation correction.
Abstract:
With the asymmetric resource sharing disclosed herein, a base station (100) transmits fewer information symbols at some transmission times to one or more mobile terminals (200) than to other mobile terminals (200) at other transmission times. After transmitting the information symbols (310, 330), the base station (100) receives channel estimates from the mobile terminals (200, 320, 340), which the base station (100) then use to generate synthesized signals representing estimates of the signals received at the mobile terminals (200, 350). The base station (100) subsequently combines complementary pairs of the synthesized signals to generate combined signals (360) and transmits at least one of the combined signals (370) to implement at least one virtual antenna for at least one of the mobile terminals (200).
Abstract:
무선 통신 시스템에서 의한 채널 품질 지시자(CQI; channel quality indicator)를 측정하는 방법 및 장치가 제공된다. 단말(UE; user equipmenet)은 셀 특정(cell-specific)하게 전송되는 셀 특정 참조 신호(CRS; cell-specific reference signal) 및 채널 상태 정보(CSI; channel state reference) 참조 신호(CSI RS) 중 적어도 하나를 기지국으로부터 수신한다. 단말은 또한, 단말 특정하게 전송되는 복조 참조 신호(DMRS; demodulation reference signal)를 PDSCH(physical downlink shared channel) 영역 내에 구성되는 e-PDCCH(enhanced physical downlink control channel) 영역에서 상기 기지국으로부터 수신한다. 단말은 상기 CRS 및 상기 CSI RS 중 적어도 하나 또는 상기 DMRS 중 어느 하나를 기반으로 상기 CQI를 측정한다.
Abstract:
본 출원에서는 무선 통신 시스템에서 단말이 신호를 처리하는 방법이 개시된다. 구체적으로, 서빙 셀과의 채널에 기반하여, 상기 서빙 셀에 대한 권장 송신 빔포밍 벡터와 사전 수신 필터링 벡터를 산출하는 단계, 인접 셀로부터의 신호에 상기 사전 수신 필터링 벡터를 적용하여, 상기 인접 셀과의 유효 채널을 계산하는 단계, 상기 유효 채널에 기반하여, 상기 인접 셀에 대한 제약 빔포밍 벡터를 산출하는 단계, 상기 송신 빔포밍 벡터와 상기 제약 빔포밍 벡터에 관한 정보를 상기 서빙 셀로 송신하는 단계, 상기 서빙 셀로부터 상기 송신 빔포밍 벡터와 상기 제약 빔포밍 벡터의 적용 응답 신호를 수신하는 단계, 및 상기 사전 수신 필터링 벡터를 적용하여, 상기 서빙 셀로부터 송신 빔포밍 벡터가 적용된 신호를 수신하는 단계를 포함하는 것을 특징으로 한다.
Abstract:
Systems and methods for conveying wireless transmission allocation information are disclosed. In accordance with one method, an index indicating selected data stream parameters is received. In addition, an indication of a number of transmit antennas at a transmitter from which the data stream is transmitted is also received. Further, the selected parameters are determined from the index based on the number of transmit antennas at the transmitter. Moreover, data signals are received and processed with a processor in accordance with the selected data stream parameters.
Abstract:
Method and arrangement in a base station for sending data to a user equipment. The base station comprises an instance of a codebook, corresponding to another instance of the codebook comprised in the user equipment. The method comprises obtaining channel state information from a signal received from the user equipment, estimating a channel to be used for transmitting data to the user equipment, calculating a precoder, based on the obtained channel state information. Further is comprised the steps of selecting a precoding index from the codebook based on the calculated precoder, or selecting a precoding index received from the user equipment, precoding data to be transmitted to the user equipment using the calculated precoder and transmitting the precoded data, a non-user dedicated reference signal and the precoding index on the estimated channel to the user equipment. Further, corresponding method and arrangement in a user equipment are described.
Abstract:
The present invention relates to a method for sending a data signal from a transmitter to a receiver in a multiple antenna wireless communication system. In particular, the method comprises: sending information about the number of transmission antennas of the transmitter to the receiver; receiving from the receiver information about the number of effective communication links of the transmitter and the receiver; determining a precoding matrix based on the information about the number of effective communication links; and receiving from the receiver the data signal using the precoding matrix, wherein transmission antennas of the transmitter and receiving antennas of the receiver respectively form effective communication links independent of each other.