公开(公告)号：US20170288823A1

公开(公告)日：2017-10-05

申请号：US15628401

申请日：2017-06-20

Applicant: QUALCOMM Incorporated

Inventor： Naga Bhushan ,  Durga Prasad Malladi ,  Yongbin Wei ,  Peter Gaal ,  Tao Luo ,  Tingfang Ji ,  Gavin Bernard Horn ,  Wanshi Chen ,  Aleksander Damnjanovic

IPC: H04W28/08 ,  H04L1/00 ,  H04L27/00 ,  H04L27/26 ,  H04L5/00 ,  H04L5/14 ,  H04W16/14 ,  H04W24/02 ,  H04W28/02 ,  H04W28/16 ,  H04W48/10 ,  H04W56/00 ,  H04W72/04 ,  H04W72/08 ,  H04W74/00 ,  H04W74/04 ,  H04W74/08 ,  H04W76/02 ,  H04J11/00 ,  H04W84/12 ,  H04W88/02 ,  H04W88/06 ,  H04W88/08

Abstract: Methods and apparatuses are described in which an unlicensed spectrum is used for Long Term Evolution (LTE) communications. A first method includes performing clear channel assessment (CCA) to determine availability of an unlicensed spectrum, transmitting a request-to-send (RTS) signal to a set of user equipments (UEs) using the unlicensed spectrum when a determination is made that the unlicensed spectrum is available, and receiving, in the unlicensed spectrum, a common clear-to-send (CTS) signal and an individual CTS signal from one or more of the UEs in response to the RTS signal. A second method includes transmitting an RTS signal in an unlicensed spectrum or a V-RTS signal in a licensed spectrum, addressed to a set of UEs, and transmitting a CTS-to-self signal in the unlicensed spectrum along with the transmission of the V-RTS signal.