Electronics and Telecommunications Research Institute

Jung Sook Bae

Heesoo Lee

Seung Jae Bahng

An Seok Lee

Jun Sik Kim

Soon Gi Park

Yeong Jin Kim

Daeho Kim

Hyungu Hwang

Disclosed are a method and an apparatus for codebook design in a communication system. A method of a base station may comprise: transmitting a pilot signal to a terminal by using a reconfigurable intelligent surface (RIS); receiving, from the terminal, channel information measured based on the pilot signal; estimating characteristics of elements of the RIS based on the channel information; generating a codebook based on the estimated characteristics of the elements; and transmitting the codebook to a controller of the RIS.

Method and apparatus for codebook design in communication system

An operation method of a first device in a communication system may comprise: receiving, at a second device, a primary synchronization signal block (SSB) including first SSBs for the first device; feeding back to the second device an index of a first SSB with a highest received signal strength among the first SSBs of the first SSB set; receiving, at the second device, a second SSB set including the first SSBs for the first device and second SSBs for a third device; transmitting to the third device the second SSBs for the third device in the second SSB set; and forwarding an index of a second SSB with a highest received signal strength among the second SSBs to the second device, the index being received from the third device.

Beam search method and apparatus in smart repeater system

A method for controlling base stations in a wireless communication system may include: performing a monitoring operation on a first base station forming a first cell in a predetermined communication area; determining whether the first base station needs to be replaced; when the first base station needs to be replaced, controlling a second base station to move in a direction of the first base station and form a second cell; when coverages of the first and second cells overlap fully or partially, decreasing a transmit power of the first base station and increasing a transmit power of the second base station; and in response to identifying that all of one or more communication nodes connected to the first cell are handed over to the second base station, determining that the first base station is successfully replaced with the second base station.

Method and apparatus for switching aerial base stations in wireless communication system

An operation method of a terminal for initial access in a communication system may comprise: receiving a plurality of SSBs having different indexes through a plurality of antennas included in a base station; calculating a channel capacity using the plurality of SSBs; feeding back, to the base station, index(es) of one or more SSBs for having a maximum channel capacity among the plurality of SSBs; and performing communication with the base station through a combination of two or more antennas that have transmitted the one or more SSBs for having the maximum channel capacity among the plurality of antennas.

Method and apparatus for initial access in communication system

A beam alignment method performed by a first communication node in a communication system may comprise: identifying a position of a first antenna of the first communication node; configuring a first coordinate system based on a physical position and direction of the first antenna, based on information on the position of the first antenna; identifying a position of a second antenna of a second communication node of the communication system; converting information on the position of the second antenna into coordinate information based on the first coordinate system; calculating direction change values of the first antenna based on the information on the position of the second antenna, which is converted based on the first coordinate system; changing a direction of the first antenna based on the direction change values of the first antenna; and updating a beam alignment state between the first and second antennas.

Method and apparatus for controlling beam in wireless communication system

Disclosed is a method of deciding a radio link failure at a base station. The method includes initializing a signal quality degradation count value, measuring an uplink signal quality at predetermined time intervals, and increasing the signal quality degradation count value when the uplink signal quality is less than a predetermined lower limit quality threshold value, wherein a radio link failure is decided when the signal quality degradation count value reaches a predetermined radio link failure decision threshold value while the measuring of the uplink signal quality and the increasing of the signal quality degradation count value are repetitively performed a predetermined number of times.

Method of deciding radio link failure at base station

A feedback generation method for uplink Transmit Power Control (TPC) in a mobile communication system is provided. A feedback generation system for uplink TPC includes an uplink information receiver to receive uplink information from a terminal, to measure a Signal-to-Interference Noise Ratio (SINR) value with respect to the received uplink information, and to measure a movement speed of the terminal, a transmission power adjustment value setting unit to set a transmission power adjustment value based on the movement speed of the terminal; an adjusted SINR calculator to calculate an adjusted SINR value, based on an expected SINR value and the measured SINR value; and a feedback information regenerator to regenerate feedback information based on the transmission power adjustment value and the adjusted SINR value, and to transmit the regenerated feedback information to the terminal.

Growing community of inventors

Daejeon, South Korea

Jung Sook Bae