Nambirajan Seshadri, Carl Erik W Sundberg, Wai Choong Wong: Method of multiple access. AT&T, Katharyn E Olson, May 30, 1995: US05420851 (184 worldwide citation)

A low delay multiple access scheme called Shared Time-Division Duplexing (STDD), allows both uplink and downlink voice traffic to share a common channel. The scheme contains separate uplink and downlink control channels and a common voice information channel. The control channels comprise means for ...