9.5 OTA Transmit ON/OFF power

37.1053GPPActive Antenna System (AAS) Base Station (BS) transmission and receptionRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

9.5.1 General

OTA transmitter ON/OFF power requirements apply only to TDD operation of E-UTRA.

The OTA Transmit ON/OFF power requirements are co-location requirements and specified as the power sum of the supported polarization(s) at the co-location reference antenna conducted output(s).

9.5.2 OTA Transmitter OFF power

9.5.2.1 General

OTA transmitter OFF power is defined as the mean power measured over 70/N μs filtered with a square filter of bandwidth equal to the Base Station RF Bandwidth(s) centred on the central frequency of the Base Station RF Bandwidth (s) during the transmitter OFF period. N is equal to 1 for UTRA and E_UTRA SCS/15 for NR, where SCS is Sub Carrier Spacing in kHz.

For multi-band RIBs and single band RIBs supporting transmission in multiple bands, the requirement is only applicable during the transmitter OFF period in all supported operating bands.

For AAS BS supporting intra-band contiguous CA, the transmitter OFF power is defined as the mean power measured over 70/N us filtered with a square filter of bandwidth equal to the Aggregated BS Channel Bandwidth BW_{Channel_CA} centred on (F_edge,high+F_edge,low)/2 during the transmitter OFF period. N is equal to 1 if there are any UTRA or E-UTRA carriers, or for NR N = SCS/15, where SCS is the smallest supported Sub Carrier Spacing in kHz in the Aggregated BS Channel Bandwidth.

9.5.2.2 Minimum requirement for MSR operation

There is no OTA transmitter OFF power requirement for UTRA operation.

For NR and E-UTRA operation, the total power from all co-location reference antenna conducted output(s) shall be less than -106 dBm/MHz.

9.5.2.3 Minimum requirement for single RAT UTRA operation

There is no OTA transmitter OFF power requirement for UTRA operation.

9.5.2.4 Minimum requirement for single RAT E-UTRA operation

The total power from all co-location reference antenna conducted output(s) shall be less than -106 dBm/MHz.

9.5.3 OTA Transmitter transient period

9.5.3.1 General

The OTA transmitter transient period is the time period during which the transmitter unit is changing from the OFF period to the ON period or vice versa. The OTA transmitter transient period is illustrated in figure 9.5.3.1-1.

Figure 9.5.3.1-1: Illustration of the relations of transmitter ON period,
transmitter OFF period and transmitter transient period

This requirement applies at each co-location reference antenna conducted output supporting transmission in the operating band.

9.5.3.2 Minimum requirement for MSR operation

For E-UTRA operation, the minimum requirements for MSR AAS BS OTA transmitter transient period shall be shorter than the values in table 9.5.3.4-1.

For NR operation, the minimum requirements for MSR AAS BS OTA transmitter transient period shall be shorter than the values specified in 3GPP TS 37.104 [5] subclause 6.4.2.1.

9.5.3.3 Minimum requirement for single RAT UTRA operation

There is no OTA Transmitter transient period requirement for UTRA operation.

9.5.3.4 Minimum requirement for single RAT E-UTRA operation

For single RAT AAS BS, the OTA transmitter transient period shall be shorter than the values in table 9.5.3.4-1.

Table 9.5.3.4-1: Minimum requirements for the transmitter transient period

Transition	Transient period length [us]
OFF to ON	17
ON to OFF	17