Electronics and Telecommunications Research Institute

Seuck Ho Won

Seong Rag Kim

Il Gyu Kim

Jung-Im Kim

Young-Hoon Kim

Kapseok Chang

Keun Young Kim

Hee Sang Chung

Yeong Jin Kim

A method for managing links, performed by a first communication node in a communication system, includes: obtaining, through an interface, communication status information including communication quality information for each link between the first communication node and at least one other communication node of the communication system; obtaining communication environment information including movement information and location information of each of the at least one other communication node; and obtaining a link probability computational model outputting a first link probability according to input of the communication status information by iteratively performing a machine learning operation based on the communication status information and the communication environment information, wherein the first link probability is used by the first communication node to control multi-connectivity with the at least one other communication node.

Method and apparatus for controlling multi-connectivity in wireless communication system

A method and an apparatus for transmitting a signal by using a plurality of radio units (RUs) to a user equipment (UE). The apparatus is configured to: determine an RU set including at least two RUs of the plurality of the RUs based on a feedback regarding a received strength of a transmission beam formed by the plurality of the RUs, wherein the feedback is received from the UE; determine a distributed precoding matrix of which a diversity order is predetermined based on information about an RU included in the RU set; and perform a precoding based on the distributed precoding matrix and transmitting a precoded signal to the UE through the RU set.

Method and apparatus for transmitting signal using multiple radio units

A layered transmission apparatus transmitting information regarding a plurality of layers includes: coding units coding an information bit of a corresponding layer to generate code bits; bit interleaving units bit-interleaving a corresponding code bit to generate interleaved symbols; a modulation unit classifying layers into layer groups, and modulating interleaved symbols corresponding to each of the groups to generate a modulation symbol of each of the groups; a gain control unit controlling gain of the modulation symbol of each of the groups; and an adding unit adding gain-controlled modulation symbols of the groups to generate a transmission symbol.

Layered transmission apparatus and method, reception apparatus and reception method

Disclosed is a symbol synchronization obtaining apparatus robust to a frequency offset in a cell search of a wireless communication system. The symbol synchronization obtaining apparatus robust to a frequency offset in a cell search of a wireless communication system may include a sequence generator to generate a base sequence for obtaining the symbol synchronization, a synchronization pattern generator to generate a modified sequence based on the base sequence, and to generate a synchronization pattern by combining the modified sequence and the base sequence, a frequency mapping unit to perform mapping of transmission information to a time area and a frequency area, based on the synchronization pattern, for generating a transmission frame, and a transmitting unit to transmit the transmission frame.

Symbol timing synchronization obtaining method and apparatus robust to frequency offset in cell search of wireless communication system

A receiver for receiving a layer-modulated signal includes: a base layer decoding unit configured to calculate a bit metric including code bit information of a base layer based on the reception signal and decode an information bit of the base layer; and at least one enhancement layer decoding unit configured to decode an information bit of an upper layer of a lower layer based on the decoding results of the lower layer, wherein the base layer decoding unit and the at least one enhancement layer decoding unit are sequentially connected according to the order of the corresponding layers.

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Daejeon, South Korea

Seuck Ho Won