Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Youngchul Sung

Gilwon Lee

Juho Park

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

Disclosed herein are a user scheduling and beamformer design method, apparatus, and storage medium for multi-user MIMO downlink based on two-stage beamforming or single-stage beamforming. The user scheduling and beamformer design method includes 1) a two-step feedback approach, 2) the use of orthonormal reference beam vectors, 3) computation of the angle between the user's channel vector and each of the orthonormal reference beam vectors, 4) first-step feedback of the reference beam index to which the user's channel vector's angle is less than a certain threshold and feedback of the user's channel vector's norm, 5) selection of roughly orthogonal users with large channel norm based on the use of reference beam vectors and the channel norm feedback, 6) second-step feedback of the channel state information (CSI) from the scheduled users, 7) design of multi-user downlink beamformer for the scheduled users based on the second-step feedback of the CSI of the scheduled users. The main key point of this invention is that in the first step of user selection, we propose to use the channel norm or noise-plus-interference-divided channel norm as the feedback quantity and we propose to use only the angle between each of the reference beam vectors and the user's channel vector to identify the closest reference beam vector.

Growing community of inventors

Daejeon, South Korea

Youngchul Sung