# Commission Implementing Decision (EU) 2019/784 of 14 May 2019 on harmonisation of the 24,25-27,5 GHz frequency band for terrestrial systems capable of providing wireless broadband electronic communications services in the Union (notified under document C(2019) 3450) (Text with EEA relevance), Division 3: Technical conditions for base stations — Block Edge Mask

Extent: E+W+S+N.I.

The technical parameters for base stations, called block edge mask (BEM) set out in this section, are an essential component of the conditions necessary to ensure coexistence between neighbouring wireless broadband electronic communications networks in the absence of bilateral or multilateral agreements between operators of such neighbouring networks. Operators of wireless broadband electronic communications services in the 24,25-27,5 GHz band may agree, on a bilateral or multilateral basis, less stringent technical parameters provided that they continue to comply with the technical conditions applicable for the protection of other services, applications or networks and with their cross-border obligations. Member States shall ensure that those less stringent technical parameters can be used by agreement among all affected parties.
A BEM is an emission mask that defines power levels as a function of frequency relative to the edge of a block of spectrum assigned to an operator. It consists of several elements as shown in Table 1. The baseline power limit ensures that the spectrum of other operators is protected. The additional baseline power limit (out-of-band limit) ensures that the spectrum for services and applications outside the 24,25-27,5 GHz frequency band is protected. The transitional region power limit enables a roll-off of power levels from the in-block to the baseline power limit and ensures co-existence with other operators in adjacent blocks.
Figure 2 shows a general BEM applicable to the 26 GHz frequency band.

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Source: https://www.legislation.gov.uk/eudn/2019/784/annex/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2019-784/annex/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.