A buffer information report can be sent to a system station from a node for relaying communications between {HEAD ~ at least one user station} and {TAIL ~ the system station} 
A buffer information report can be sent to a system station from a node for relaying communications between { HEAD ~ at least one user station } and { TAIL ~ the system station }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL