The location, the power, and the antenna heights of all stations in the network should be selected in such a way that their range is confined, as far as possible, to the zone to be covered by the intended service.

Excessive antenna heights and transmitter outputs should be avoided, by using several locations of reduced height wherever possible. In border areas, directional antennas should be used to minimise the interference potential.

The effective radiated power and the height of the antenna should be as low as possible in relation to the area to be served.

BC = 10 x log10 (channel spacing / 25 kHz), dB

The value BC resulting from the formula should be added to the indicative coordination threshold as listed above.

T/R 25-08 35 considers the coordination between preferential channels of land mobile systems up to 25 kHz on one side and land mobile systems with a channel greater than 1 MHz on the other side of the border, for operation within the 400 MHz frequency bands.

Figure 5: Overlapping narrower channel and wider channel land mobile systems across the border

The following should be considered:

Note: @ stands for “at a distance inside the neighbouring country.”

For practical purposes, an antenna height correction factor of 10 dB from 10 m to 3 m height may be used. Other examples are the Okumura-Hatta model 37 that provides 15.6 dB, the ITU-R Recommendation P.1546 38 that provides 10.3 dB or HCM that provides 9 dB.

T/R 25-08 3 considers the coordination between land mobile systems with channel bandwidths greater than 1 MHz on both sides of the border, for operation within the 400 MHz ranges. ECC Report 276 4 provides technical background information. The deployment mode considered is FDD in the frequency bands 410-420 MHz (duplex with 420-430 MHz) and 450-460 MHz (duplex with 460-470 MHz).

Case A

Base stations using the same technologies on both sides of the border line with centre frequencies not aligned, or using preferential PCIs or PN (Pseudo-Noise) codes given in Appendix C with centre frequencies aligned may be used without coordination between neighbouring countries if the mean field strength produced by the cell (all transmitters within the sector) does not exceed the value of 55 dBμV/m/5 MHz at a height of 3 m above ground at the border line between neighbouring countries and does not exceed a value of 37 dB V/m/5 MHz at a height of 3 m above ground at a distance of 10 km inside the neighbouring country.

Case B

Base stations using the same technologies on both sides of the border line with centre frequencies aligned and using non-preferential PN codes or PCIs given in Appendix C may be used without coordination between neighbouring countries if the mean field strength produced by the cell (all transmitters within the sector) does not exceed the value of 37 dBμV/m/5 MHz at a height of 3 m above ground at the border line between neighbouring countries.

Case A

In the case of different technologies used on either side of the border line, with centre frequencies aligned or not aligned, base stations may be used without coordination with a neighbouring country if the mean field strength produced by the cell (all transmitters within the sector) does not exceed the value of 55 dBμV/m/5 MHz at a height of 3 m above ground at the borderline between neighbouring countries and does not exceed a value of 37 dBμV/m/5 MHz at a height of 3 m above ground at a distance of 10 km inside the neighbouring country.

For land mobile systems with channel bandwidth greater than 1 MHz, an overview of the trigger values of the field strength and the relevant paragraphs of this RFSAP is given in Table 21.

Note: @ stands for “at a distance inside the neighbouring country.”

Administrations may agree in bilateral or multilateral agreements/arrangements on preferential usage of frequencies, while ensuring fair treatment of different operators.

For example:

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