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1. (WO2017188870) A FIRST COMMUNICATIONS DEVICE AND METHOD THEREIN FOR TRANSMITTING DATA TO A SECOND COMMUNICATIONS DEVICE

Pub. No.:    WO/2017/188870    International Application No.:    PCT/SE2016/050375
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Fri Apr 29 01:59:59 CEST 2016
IPC: H04W 74/08
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: SUNDMAN, Dennis
LOPEZ, Miquel
SHARIATI, Nafiseh
NILSSON, Thomas
Title: A FIRST COMMUNICATIONS DEVICE AND METHOD THEREIN FOR TRANSMITTING DATA TO A SECOND COMMUNICATIONS DEVICE
Abstract:
A first communications device 102 and a method therein for transmitting data to a second communications device 104 on a sub-channel. The first device performs carrier sensing on a first sub-channel assigned an unknown occupancy state. When the first sub-channel is determined as being vacant, the first device transmits, to the second device, the data on the first sub-channel. When the first sub-channel is determined as being occupied, the first device assigns the first sub-channel an occupied state, starts a first time period associated with the first sub-channel, and performs carrier sensing on a second sub- channel assigned with the unknown occupancy state. When the second sub-channel is determined as being vacant, the first device transmits, to the second device, the data on the second sub-channel. In absence of the second sub-channel assigned an unknown occupancy state, the first device enters an inactive mode until the first time period has expired.