Abstract:
Clustered DFT-s-OFDM 방식의 전송 방법에 있어서, 레퍼런스 시그널(Reference signal)의 생성 및 전송 방법이 개시된다. 상향링크 전송을 위하여 할당된 클러스터 수만큼의 DM-RS 시퀀스를 생성하는 단계 및 생성된 DM-RS 시퀀스를 각 클러스터 별 해당 DM-RS 심볼 위치에 맵핑하는 단계를 포함하여 Clustered DFT-s-OFDM 방식의 DM-RS 생성 및 전송 방법을 구성한다. 따라서, 클러스터별로 DM-RS 시퀀스를 할당하여 전송하는 본 발명에 따른 RS 신호의 생성 및 전송 방법을 따를 경우에는, 클러스터 단위로 완전한 DM-RS 시퀀스를 사용하게 되므로, 셀간 간섭 문제(Inter-Cell Interference)가 약화될 뿐만 아니라, MU-MIMO(Multi-User MIMO)의 적용에도 문제가 없게 된다.
Abstract:
Disclosed is a communication method using a large-scale antenna in a multi-cell environment. A base station classifies a plurality of terminals within a cell into a cell-centered terminal group and a cell-boundary terminal group according to a preset reference, transmits downlink pilot signals to each of the classified groups, receives a first precoding matrix indicator (PMI) regarding a cell to which each terminal belongs from each terminal belonging to the cell-boundary terminal group and a second PMI regarding an interference signal from an adjacent cell, and subsequently generates interference information between multiple cells on the basis of the first PMI and the second PMI. Thus, information exchange through controlling interference between base stations can be minimized.
Abstract:
본 발명은 임의 접속 프리앰블을 전송하는 단말기 및 임의 접속 프리앰블을 수신하는 기지국을 제공한다. 단말기는 프리앰블에 대한 그룹핑 조건을 기지국으로부터 수신하고, 수신된 그룹핑 조건에 따라서 프리앰블들을 복수의 프리앰블 그룹으로 그룹핑한다. 단말기는 임의 접속 프리앰블을 선택하고, 선택한 임의 접속 프리앰블이 포함된 프리앰블 그룹에 대한 정보를 기지국으로 전송한다. 기지국은 프리앰블 그룹에 대한 정보에 기반하여 임의 접속 절차를 효율적으로 수행할 수 있다. 임의 접속, 프리앰블, 그룹핑
Abstract:
Disclosed is a method for transmitting a signal using multiple antennas. A base station transmits a reference signal using a plurality of beams which are formed using respective multiple antenna groups; receives a first precoder matrix index (PMI-1) and a second precoder matrix index (PMI-2) corresponding to the reference signal from a terminal; and performs precoding of a downlink transmission signal based on a first precoder corresponding to the first precoder matrix index and a second precoder corresponding to the second precoder matrix index. Therefore, the present invention can increase the capacity of a system.
Abstract:
Provided is a communication system for transmitting a control channel using a downlink. The communication system transmits information on the transfer of uplink allocation information representing whether uplink allocation information is transmitted, to a terminal using a downlink and the terminal determines whether or not a downlink frame includes uplink allocation information on the basis of the information on the transfer of the uplink allocation information. In addition, a base station transmits information on resources to the terminal through which a downlink physical control channel can be transmitted; and the terminal decodes a downlink control channel only within available resources through which a downlink physical control channel can be transmitted.
Abstract:
A method and a device of discovery for device-to-device communications are provided. The discovery method includes a step of transmitting a discovery request message for discovering a neighboring terminal; a step of receiving a response message which is a response to the discovery request message from at least one neighboring terminal; a step of forming a communications link with a first neighboring terminal, which has the shortest distance from a searching terminal, among at least one neighboring terminal based on the discovery response message; a step of receiving neighboring terminal information from the first neighboring terminal through the communications link; and a step of obtaining information of terminal which is neighboring the searching terminal based on the neighboring terminal information.
Abstract:
A discovery method for device-to-device communications is disclosed. The discovery method for device-to-device communications comprises a step for the transmission of a first subframe; a step of transmitting a discovery channel through a predetermined section on a second subframe positioned next to the first subframe; and a step for the transmission of a third subframe which is positioned next to the second subframe. Therefore, the discovery channel can be transmitted or received without colliding with other data. [Reference numerals] (AA) Frequency; (BB) Time; (CC) UL subframe n-1; (DD,FF) Time interval; (EE) Discovery subframe; (GG) UL subframe n+1