The performance and ease of management of wireless communications environments is improved by {HEAD ~ a mechanism} that enables {TAIL ~ access points} to perform automatic channel selection 
enables
The performance and ease of management of wireless communications environments is improved by { HEAD ~ a mechanism } that enables { TAIL ~ access points } to perform automatic channel selection
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH