Division C 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, in the absence of bilateral or multilateral agreements between operators of such neighbouring networks. Less stringent technical parameters, if agreed among the operators of such networks, may also be used.

The BEM consists of several elements given in Table 1. The in-block power limit is applied to a block owned by an operator. The baseline power limit, designed to protect the spectrum of other operators, the transitional region power limit, enabling filter roll-off from the in-block to the baseline power limit, and the restricted baseline power limit applicable to cases of unsynchronised or semi-synchronised operation represent out-of-block elements. The additional baseline power limit is an out-of-band power limit which is used either for the protection of radar operation below 3 400 MHz or for the protection of fixed satellite services (FSS) and fixed services (FS) above 3 800 MHz.

Tables 2 to 7 contain the power limits for the different BEM elements for TDD networks providing wireless broadband (WBB) electronic communications services (ECS). Power limits are provided for synchronised, unsynchronised and semi-synchronised WBB ECS networks.

In Tables 3 and 4, the power level P_Max is the maximum carrier power in dBm for the base station in question. P_Max is defined and measured as the equivalent isotropically radiated power (e.i.r.p.) per antenna for base stations with non-active antenna systems (non-AAS). For AAS, base stations P_Max is defined as the maximum mean carrier power in dBm for the base station and measured as TRP per carrier in a given cell.

In Tables 3, 4, and 7 the power limits are determined relative to a fixed upper limit by means of the formula Min(P_{Max — A} , B), which sets the lower (or stricter) of two values: (1) (P_Max A) expressing the maximum carrier power P_Max minus a relative offset A, and (2) the fixed upper limit B.

To obtain a BEM for a specific block, the BEM elements that are defined in Table 1 are combined in the following steps:

1. 1..

   in-block power limit is used for the block assigned to the operator;

2. 2..

   transitional regions are determined, and corresponding power limits are used;

3. 3..

   baseline power limit is used in the case of synchronised WBB ECS networks for spectrum within the band except from the operator's block in question and the corresponding transitional regions;

4. 4..

   restricted baseline power limits are used in the case of unsynchronised and semi-synchronised WBB ECS networks;

5. 5..

   for spectrum below 3 400 MHz the respective additional baseline power limit is used;

6. 6..

   for coexistence with FSS/FS above 3 800 MHz an additional baseline power limit is used.

The Figure below provides an example of the combination of different BEM elements.