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