When execution of the communication task can be extended, the communication apparatus extends {HEAD ~ execution} of {TAIL ~ the communication task} to a later time 
When execution of the communication task can be extended , the communication apparatus extends { HEAD ~ execution } of { TAIL ~ the communication task } to a later time
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH