Abstract:
PURPOSE: A transmitting and receiving device for transmitting and receiving channel state information reference signals at a giant multiple input multiple output system operating in a frequency division duplex mode and a method thereof are provided to effectively transmit the channel information of various antennas and enable a receiving device to effectively estimate downlink channel state information using only downlink resources of limited amount. CONSTITUTION: A control part (1030) generates a signal for each beam to be transmitted through each antenna port. The control part forms the beam by precoding the signal for the each beam generated through a beam forming vector. The control part separates the resource reusing groups of an arbitrary number through grouping beams which is sharing the same resources of the formed beam. The control part transmits the beam to a receiving device by allocating the resource by the resource reusing group. The control part allocates the resources by determining the beam in which a transmitting device has a maximum benefit using feedback information transmitted from the receiving device. [Reference numerals] (1010) Wireless communication part; (1020) Storage part; (1030) Control part; (1031) Signal generation part by beams; (1032) Precoding part; (1033) Scheduler
Abstract:
본 발명은 수평적 차원과 수직적 차원을 동시에 고려하는 이차원 안테나 배열에 의한 M*N개의 빔들에 의해 마크로 서비스 영역을 형성하고, 상기 마크로 서비스 영역에 적어도 하나의 스몰 서비스 영역을 형성하는 이종 망에서 상기 마크로 서비스 영역에서의 신호 송/수신을 지원하는 기지국이 상기 M*N개의 빔들을 성형하는 장치 및 방법을 제안한다. 이를 위해 M*N개의 빔들에 의해 송신될 신호들 중 상기 적어도 하나의 스몰 서비스 영역에서의 송신 신호에 대해 간섭을 미칠 수 있는 신호를 송신하도록 형성된 적어도 하나의 간섭 예상 빔을 선별하고, 상기 선별한 적어도 하나의 간섭 예상 빔에 의해 송신될 신호로 인한 상기 적어도 하나의 스몰 서비스 영역에서의 셀 간 간섭을 고려하여 상기 M*N개의 빔들 각각에 대한 빔 성형을 수행한다.
Abstract:
PURPOSE: A device and a method thereof for giving channel state information (CSI) feedback by using the limited amount of information in a wireless communication system using a massive multiple-input multiple-output (MIMO) operating in a frequency division duplex (FDD) mode are provided for a mobile station to effectively give a base station feedback of the CSI by using the limited amount of feedback information. CONSTITUTION: A control part (620) selects a beam index having a maximum result value by comparing arbitrary function result values having channel coefficients of N as an input. The control part selects a beam index which is above a threshold value which is the constant value of the maximum result value among the function result values. The control part includes the selected beam index in a valid beam index aggregation. The control part estimates channel state information for the valid beam index aggregation. The control part controls a wireless communication part to give a base station feedback of the estimated channel state information and the valid beam index aggregation. [Reference numerals] (610) Wireless communication part; (620) Control part; (623) Channel state estimation part; (625) Valid beam index determination part; (627) Feedback information producing part; (630) Storing part