LISTEN-BEFORE-TALK RESERVATION SCHEME FOR WIRELESS COMMUNICATIONS OVER UNLICENSED SPECTRUM

摘要

#$%^&*AU2018204555B220200709.pdf#####ABSTRACT Methods and apparatuses are described in which an unlicensed spectrum is used for Long Term Evolution (LTE) communications. In one embodiment, a method includes synchronizing, in an aligned clear channel assessment (CCA) period comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbol positions, CCA slots to determine availability of a shared spectrum for transmissions in a next transmission interval, wherein a first CCA slot of the CCA slots is aligned with a first OFDM symbol position of the plurality of OFDM symbol positions and a second CCA slot of the CCA slots is aligned with a second OFDM symbol position of the OFDM symbol positions.