Opportunity-Driven Multiple Access

Opportunity-Driven Multiple Access (ODMA) is a UMTS communications relaying protocol standard first introduced by the European Telecommunication Standards Institute (ETSI) in 1996. ODMA has been adopted by the 3rd-Generation Partnership Project, 3GPP to improve the efficiency of UMTS networks using the TDD mode.

Source: Wikipedia — Opportunity-Driven Multiple Access (CC BY-SA 4.0)