Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Juho Park

Jun Hwan Lee

Eun-Young Choi

Young Seog Song

Young Jo Ko

Seung Chan Bang

Ji Hyung Kim

Ju Young Kim

Cheulsoon Kim

Sung-Hyun Moon

Junghoon Lee

Minhyun Kim

Joonwoo Shin

Min Seok Jang

Youngchul Sung

Gilwon Lee

Disclosed are an optical modulation device and a phase modulation method using the same. The optical modulation device includes a reflection plate, an insulating film over the reflection plate, dielectric patterns aligned on the insulating film in a first direction and extended in parallel in a second direction intersecting the first direction, and first and second graphene patterns provided between the dielectric patterns aligned in the first direction and arranged in an alternating fashion. The first and second graphene patterns are in direct contact with the insulating film and the dielectric patterns are in direct contact with the insulating film at locations between the first and second graphene patterns. A width of each of the first graphene patterns in the first direction is different from a width of each of the second graphene patterns in the first direction.

Optical modulation device and phase modulation method using the same

A transmission method of a base station is provided. The base station generates a physical channel or a physical signal using a physical resource block (PRB) that is a resource allocation unit in a frequency domain. The base station transmits the physical channel or the physical signal.

Transmission method and apparatus using numerology and scheduling method and apparatus using numerology

A base station using a plurality of beams transmits a plurality of training beams, receives measurement information regarding a first number of training beams with a highest received signal strength indication (RSSI) from each of a plurality of terminals which have received the plurality of training beams, generates an RSSI table representing RSSIs of terminals and beam indices on the basis of the measurement information regarding the first number of training beams of each terminal, and subsequently schedules terminals to perform simultaneous transmission among the plurality of terminals using the RSSI table.

Scheduling method and apparatus in mobile communication system

Provided is a method for feeding back a channel quality indicator (CQI) by a terminal. The terminal receives, from a base station, at least one reference signal through at least one of multiple beams of the base station. The terminal measures a signal-to-interference plus noise ratio (SINR) for the at least one reference signal. The terminal determines a first level corresponding to the measured SINR among levels of a first CQI. In addition, the terminal feeds back the first CQI having the first level to the base station.

Scheduling method and apparatus of multi-antenna communication system, and method and apparatus for feeding-back channel quality indicator

A method in which a base station transmits pilot signals in a multiple-antenna communication system is provided. The base station includes some of the plurality of pilot signals distinguished by at least one of time domain symbols, subcarriers, and orthogonal codes in a first set to which a first random number is applied. The base station includes the remaining pilot signals, excluding the pilot signals that are included in the first set, in a second set that uses the same resources as used by the first set and to which a second random number different from the first random number is applied. The base station transmits at least one of the pilot signals that belong to the first set and the second set.

Method and apparatus for transmitting pilot in multi-antenna communication system, and method and apparatus for allocating pilot in multi-antenna communication system

In a communications system using a plurality of beams, a terminal determines a beam to be communicated with the terminal among the plurality of beams, determines one sequence among sequences allocated to the determined beam as a beam based random access preamble, and transmits the beam based random access preamble through the determined beam. In addition, if a random access response for the beam based random access preamble is not received from a base station for a set interval, the terminal determines one sequence among sequences in a cell based random access preamble collection as a cell based random access preamble and transmits the cell based random access preamble.

Method and apparatus for random access in communications system

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Daejeon, South Korea

Juho Park