estimating {HEAD ~ one or more network conditions} of {TAIL ~ a network} using a comparison between the certain time and the acquired timestamp 
of
estimating { HEAD ~ one or more network conditions } of { TAIL ~ a network } using a comparison between the certain time and the acquired timestamp
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH