37.1053GPPActive Antenna System (AAS) Base Station (BS) transmission and receptionRelease 17TS
Unless otherwise stated, the transmitter characteristics are specified with a full complement of transceiver units for the configuration in normal operating conditions.
The manufacturer shall declare the minimum number of supported geographical cells (i.e. geographical areas). The minimum number of supported geographical cells (Ncells) relates to the AAS BS setting with the minimum amount of cell splitting supported with transmission on all TAB connectors supporting the operating band. The manufacturer shall also declare TAB connector TX min cell groups. Every TAB connector supporting transmission in an operating band shall map to one TAB connector TX min cell group supporting the same operating band. The mapping of TAB connectors to cells is implementation dependent.
The number of active transmitter units that are considered when calculating the emissions limit (NTXU, counted) for an AAS BS is calculated as follows:
NTXU, counted = min(NTXU,active , 8×Ncells) for AAS BS in single RAT E-UTRA operation and MSR AAS BS (except UTRA only MSR AAS BS)
NTXU, counted = min(NTXU,active, 4×Ncells) for AAS BS in single RAT UTRA operation and UTRA only MSR AAS BS
NTXU,countedpercell = NTXU,counted / Ncells
NTXU,countedpercell is used for scaling the basic limits as described in subclause 6.6.
NOTE: NTXU,active depends on the actual number of active transmitter units and is independent to the declaration of Ncells.
Any transmitter requirement specified for NB-IoT in-band, NB-IoT guard band, or standalone NB-IoT operation in 3GPP TS 36.104  for E-UTRA with NB-IoT (in-band or guard band) or for standalone NB-IoT, or in 3GPP TS 37.104  for E-UTRA with NB-IoT or standalone NB-IoT in MSR operation, and referred in clause 6, is not applicable for AAS BS.
Any transmitter requirement specified for Band 46 operation or for Band 49 operation in 3GPP TS 36.104  for E-UTRA, or in 3GPP TS 37.104  for E-UTRA in MSR operation, and referred in clause 6, is not applicable for AAS BS.