6.7.1 General

37.145-23GPPActive Antenna System (AAS) Base Station (BS) conformance testingPart 2: radiated conformance testingRelease 17TS

Unwanted emissions consist of so-called out-of-band emissions and spurious emissions according to ITU definitions TS 25.331 [15]. In ITU terminology, out of band emissions are unwanted emissions immediately outside the channel bandwidth resulting from the modulation process and non-linearity in the transmitter but excluding spurious emissions. Spurious emissions are emissions which are caused by unwanted transmitter effects such as harmonics emission, parasitic emission, intermodulation products and frequency conversion products, but exclude out of band emissions.

OTA unwanted emissions for OTA AAS BS in single RAT E-UTRA operation and MSR operation using E-UTRA consist of an OTA operating band unwanted emissions requirement and OTA spurious emissions requirement. OTA operating band unwanted emissions requirement defines limits for emissions in each supported downlink operating band plus the frequency ranges ΔfOBUE above and ΔfOBUE below each band, where ΔfOBUE is the maximum offset of the operating band unwanted emission mask from the operating band edge. Emissions outside of this frequency range are limited by OTA spurious emissions requirement.

The values of ΔfOBUE are defined for OTA AAS BS for E-UTRA, NR and UTRA FDD operating bands in Table 6.7.1-1.

Table 6.7.1-1: Maximum offset of OBUE outside the downlink operating band

BS type

Operating band characteristics

ΔfOBUE [MHz]

OTA AAS BS

FDL_high – FDL_low < 100 MHz

10

100 MHz ≤ FDL_high – FDL_low ≤ 900 MHz

40

OTA unwanted emissions for OTA AAS BS in single UTRA operation and MSR operation using UTRA consist of OTA spectrum emission mask requirement and OTA spurious emissions requirement.

NOTE: For definitions of conducted unwanted emissions requirements refer to clause 6.6 in TS 37.145‑1 [9].

The unwanted emission requirements are applied per cell for all the configurations supported by OTA AAS BS. Requirements for OTA unwanted emissions are captured using TRP, directional requirements or co-location requirements as described per requirement.

There is in addition a requirement for occupied bandwidth and an ACLR requirement.