EN   EN  
 
 EUROPEAN  
COMMISSION   
Brussels, XXX   
[…](2024) XXX  draft  
ANNEX  
 
ANNEX  
to the  
Commission Implementing Decision  
on the harmonisation of the 40,5‑43,5 GHz frequency band for terrestrial systems 
capable of providing wireless broadband electronic communications services in the 
Union  
 EN 1  EN ANNEX  
TECHNICAL CONDITIONS  REFERRED TO IN ARTICLES 2 AND 3  
1. DEFINITIONS  
For the purposes of this Decision, the following definitions apply: 
(1) ‘active antenna systems  (AAS) ’ means a base station and an antenna system where 
the amplitude and/or phase between antenna elements is continually adjusted, 
resulting in an antenna pattern that varies in response to short term changes in the radio environment. This excludes long- term beam shaping such as fixed electrical 
down tilt. In AAS base stations the antenna system is integrated as part of the base station system or product; 
(2) ‘synchronised operation’  means operation of two or more different time division 
duplex (TDD) networks, where simultaneous uplink (UL) and downlink (DL) transmissions do not occur, that is at any given moment in time either all networks transmit in downlink or all networks transmit in uplink. This requires the alignment of all DL and UL transmissions for all TDD  networks involved as well as 
synchronising the beginning of the frame across all networks; 
(3) ‘unsynchronised operation’  means operation of two or more different TDD 
networks, where at any given moment in time at least one network transmits in DL while at le ast one network transmits in UL. This might happen if the TDD networks 
either do not align all DL and UL transmissions or do not synchronise at the beginning of the frame; 
(4) ‘semi-synchronised  operation’  means operation of two or more different TDD 
networks, where part of the frame is consistent with synchronised operation, while 
the remaining portion of the frame is consistent with unsynchronised operation. This requires the adoption of a frame structure for all TDD networks involved, including slots where t he UL/DL direction is not specified, as well as synchronising the 
beginning of the frame across all networks; 
(5) ‘equivalent isotropically radiated power (EIRP)’ is t he product of the power supplied 
to the antenna and the antenna gain in a given direction rel ative to an isotropic 
antenna (absolute or isotropic gain); 
(6) ‘total radiated power  (TRP) ’ is a measure of how much power a composite antenna 
radiates. It equals the total conducted power input into the antenna array system less any losses in the antenna array system. TRP means the integral of the power transmitted in different directions over the entire radiation sphere as shown in the formula:  
𝑇𝑇𝑇𝑇𝑇𝑇≝1
4𝜋𝜋� �𝑇𝑇(𝜃𝜃,𝜑𝜑)sin (𝜃𝜃)𝑑𝑑𝜃𝜃𝑑𝑑𝜑𝜑𝜋𝜋
02𝜋𝜋
0 
where P(θ,φ) is the power radiated by an antenna array system in direction (θ,φ) given by the formula:  
𝑇𝑇(𝜃𝜃,𝜑𝜑)=𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔(𝜃𝜃,𝜑𝜑) 
w
here P Tx denotes the conducted power (measured in Watts), which is input to the array 
system, and g(θ,φ) denotes the array systems directional gain along the (θ, φ) direction. EN 2  EN 2. GENERAL  PARAMETERS  
(1) The duplex mode of operation in the 40,5-43,5 GHz frequency band shall be TDD.  
(2) The assigned  block size shall be a multiple of 200 MHz. A smaller block size of 
50 MHz or 100 MHz or 150 MHz, adjacent to the assigned block of another 
spectrum user, is also possible to ensure efficient use of the whole frequency band. 
(3) The technical conditions contained in this Annex are essential to address the mutual coexistence of terrestrial systems capable of providing wireless broadband electronic communications services (WBB ECS) and the coexistence of such systems with space station receivers in the Fixed Satellite Service (FSS)  within the 42,5-43,5 GHz 
frequency band. 
(4) Base station and terminal station transmission within the 40,5 -43,5 GHz frequency 
band shall be in compliance with the technical conditions set out in this Annex. 
(5) The harmonised technical  conditions provided below are based on the assumption of 
hotspot deployment and an authorisation regime where the locations of the WBB ECS base stations (both transmitters and receivers) are known. In order to implement the necessary protection for system s referred to in Article 3, additional measures at 
national level may be required for an authorisation regime where the locations of WBB ECS base stations are not known in advance of an installation
(1), while still 
respecting the harmonised technical conditions for WBB ECS set out in this Annex. 
(6) Additional measures may be required at national level, in order to ensure appropriate 
protection of receiving satellite earth stations operating within the 40,5 -42,5 GHz 
frequency band and, if needed, within the adjacent 39,5-40,5 GHz frequency band, and of systems in the Radio Astronomy S ervice (RAS) within the 42,5-43,5 GHz 
frequency band, as well as to ensure the coexistence of terrestrial systems capable of 
providing WBB ECS with terrestrial fixed links
(2). 
(7) For WBB ECS base stations, the protection of adjacent services below 40,5 GHz and above 43,5 GHz is provided through relevant out -of-band limits, which are derived 
in accordance with ETSI TS 138 104 V17.6.0 (table 9.7.4.3.3-2)
(3). 
(8) For terminal stations, the protection of adjacent services is provided by the 
requirements of ETSI TS 138.101-2 V.17.6.0 (table 6.5.2.1- 1). 
Figure 1 provides an example of a possible channelling arrangement. 
Figure 1 
Example of a channelling arrangement within the 40,5- 43,5 GHz frequency band  
 
        
 200 MHz  … 200 MHz  200 MHz  … 200 MHz   
        
40500 MHz      43500 MHz  
 
 
(1) The implementation of sharing conditions implies the need for prior information on the existing or planned location 
of the interfering and/or the interfered system or on the distance between them.  
(2) Guidance on such measures is provided in the  ECC Recommendations (22)01 and (22)02.  
(3) The values for those limits are: TR P of -5 dBm/MHz (0 ≤ Δf < 20 MHz), -13 dBm/MHz (20 MHz ≤ Δf < 400 
MHz) and spurious limits for Δf > 400 MHz.  EN 3  EN 3. TECHNICAL  CONDITIONS  FOR  BASE  STATIONS  - BLOCK  EDGE  MASK  
The following technical parameters for base stations, called Block Edge Mask (BEM), are an 
essential component of conditions necessary to ensure coexistence between neighbouring 
networks capable of providing WBB ECS , in the absence of bilateral or multilateral 
agreements between operators of such neighbouring networks. Network operators of W BB 
ECS in the 40,5-43,5 GHz frequency band may agree bilaterally or multilaterally, on 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 obligations resulting from cross -border coordination. Member States shall ensure that 
those less stringent technical parameters can be used by agreement among all concerned 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. The BEM consists of several elements that are given in Table 1. The in -block power limit is applied to a block assigned to 
an operator. The baseline power limit ensures the protection of the spectrum of other operators within the 40,5-43,5 GHz frequency band. The transitional region power limit enables filter roll- off from the in- block to the baseline power limit in order to ensure 
coexistence with other operators in adjacent blocks. Both the baseline power limit and the transitional region power limit represent out-of- block BEM elements.  
Figure 2 shows a general BEM applicable to the 40,5-43,5 GHz frequency band. 
Figure 2 
Illustration of a block edge mask  
 
No harmonised in- block power limit is specified. Tables 2 and 3 assume synchronised 
operation. Unsynchronised or semi -synchronised operation necessitates the geographical 
separation of neighbouring networks, while additional appropriate mitigation measures  
applicable at national level may also be applied. Table 4 provides an additional technical 
In-block  
Baseline  
Licensed 
spectrum  
Transitional  
Regions  
Block edge  
In-block  
 Out-of-block  
 Frequency  
Power 
limits  
Band  edge  
In-band  
 Out-of-band  EN 4  EN condition for base stations to facilitate coexistence with satellite systems in the Earth -to-space 
FSS.  
Table 1  
Definition of BEM elements  
BEM Element  Definition  
In-block Assigned spectrum block for which the BEM is derived.  
Baseline  Spectrum within the 40,5- 43,5 GHz frequency band used for 
terrestrial systems capable of providing WBB ECS, not including 
the operator’s block under consideration and the corresponding 
transitional regions.  
Transitional region  Spectrum adjacent to an operator’s block.  
Table 2  
Base station transitional region power limit for synchronised operation  
Frequency range  Maximum TRP  Measurement bandwidth 
Up to 50 MHz below or above 
an operator’s block  12 dBm  50 MHz  
Explanatory note  
This limit ensures coexistence between wireless broadband electronic communications 
networks in adjacent block(s) within the 40,5- 43,5 GHz frequency band in synchronised 
operation. Appropriate mitigation measures may be applied at national level in case of  
unsynchronised or semi -synchronised operations(4). 
Table 3  
Base station baseline power limit for synchronised operation  
Frequency range  Maximum TRP  Measurement bandwidth 
Baseline  4 dBm  50 MHz  
Explanatory note  
This limit ensures coexistence between wireless broadband electronic communications networks  in non -adjacent blocks within the 40,5 -43,5 GHz frequency band in synchronised 
operation. Appropriate mitigation measures may be applied at national level in case of unsynchronised or semi -synchronised operations
(4). 
 
(4) Relevant information is provided in ECC Report 307  “Toolbox for the most appropriate synchronisation regulatory 
framework including coexistence  of MFCN in 24.25-27.5 GHz in unsynchronised and semi -synchronised mode”, 
approved on 6 March 2020.  EN 5  EN Table 4  
Additional conditions applying to AAS outdoor base stations  
Requirement on elevation of the main beam of AAS outdoor base stations  
When deploying such base stations, it shall be ensured that each antenna is normally transmitting only 
with the main beam pointing below the horizon and in addition the antenna shall have mechanical 
pointing below the horizon except when the base station is only receiving.  
Explanatory note  
The condition applies to the protection of space station receivers in the FSS (Earth- to-space).  
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