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 at least a second channel for {TAIL ~ transmission} 
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 at least a second channel for { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL