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