A highly efficient time slotted version is disclosed, in which transmission must begin at {HEAD ~ the start} of {TAIL ~ designated time slots}, as well as an unslotted version 
of
A highly efficient time slotted version is disclosed , in which transmission must begin at { HEAD ~ the start } of { TAIL ~ designated time slots } , as well as an unslotted version
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH