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