{HEAD ~ The base station} 6, wherein the service metric comprises the quality of {TAIL ~ service priority indicator} 
{ HEAD ~ The base station } 6 , wherein the service metric comprises the quality of { TAIL ~ service priority indicator }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL