 the edges of the RF bandwidth. In the case of non-contiguous carrier aggregation where the subblock gap is very small that the ACLR requirements at the edges of the gap will overlap, a special cumulative ACLR (CACLR) requirement is defined for the gap. For CACLR, con- tributions from carriers on both sides of the subblock gap are taken into account in the cal- culation of CACLR limit. The CACLR limit is the same as the ACLR for the BS at 45 dB. The ACLR limits for the device are set based on the assumption that an NR or a UTRA receiver on the adjacent channel is used. In the case of carrier aggregation, the device ACLR requirement is applied to the aggregated channel bandwidth as opposed to per car- rier. The ACLR limit for NR devices is set to 30 dB. This is considerably more relaxed compared to the ACS requirement for the BS, implying that in the uplink, the device 686 Chapter 5 transmitter performance will be the limiting factor for the ACIR and consequently for the coexistence between the base stations and the devices [10]. The limits for the BS spurious emissions are derived from ITU-R and are only defined in the region outside the frequency range of the OBUE limits (see Fig. 5.9) and in the frequen- cies that are separated from the BS transmitter operating band by at least 10-40 MHz. There are also additional regional or optional limits for protection of other systems that may coexist with or even co-located with the NR. One of the implementation aspects of an RF transmitter is the possibility of intermodulation between the transmitted signal and other strong signals transmitted in the proximity of the BS or the device, which leads to the requirement for transmitter intermodulation. For the BS, the requirement is based on a stationary scenario with a co-located BS transmitter, with its transmitted signal appearing at the antenna connector of the BS being specified but atten- uated by 30 dB. Since it is a stationary scenario, there are no additional unwanted emissions allowed, implying that all unwanted emi