active antenna systems (AAS)means a base station and an antenna system where the amplitude and/or phase between antenna elements is continually adjusted, resulting in an antenna pattern that varies in response to short term changes in the radio environment.
semi-synchronised operationmeans operation of two or more different TDD networks, where part of the frame is consistent with synchronised operation, while the remaining portion of the frame is consistent with unsynchronised operation.
synchronised operationmeans operation of two or more different time division duplex (TDD) networks, where simultaneous uplink (UL) and downlink (DL) transmissions do not occur, that is at any given moment in time either all networks transmit in downlink or all networks transmit in uplink.
unsynchronised operationmeans operation of two or more different TDD networks, where at any given moment in time at least one network transmits in DL while at least one network transmits in UL.