When {HEAD ~ a request} for {TAIL ~ communication task} is detected, the communication apparatus determines whether execution of the communication task can be extended at a later time 
When { HEAD ~ a request } for { TAIL ~ communication task } is detected , the communication apparatus determines whether execution of the communication task can be extended at a later time
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH