A communication system includes a plurality of channels, a first service that utilizes at least a first channel for transmission, and {HEAD ~ a second service} that utilizes {TAIL ~ at least a second channel} for transmission 
utilizes
A communication system includes a plurality of channels , a first service that utilizes at least a first channel for transmission , and { HEAD ~ a second service } that utilizes { TAIL ~ at least a second channel } for transmission
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH