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