Since lte can work with or without channel sensing, what if lte starts to send when wifi is already sending? I see there is "sanity check code" in lte-spectrum-phy.cc" stating that receiving signals should come at the same time and last for the same duration. However, in laa coexistence scenario, will that always keep true? Won't lte receive wifi signal? And wifi signal is not necessary to arrive at the begining of the subframe. If so, won't it fall into a problem?