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