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