Radiocommunications Advisory Guidelines (Managing Interference from Spectrum Licensed Transmitters – 1800 MHz Band) 2023
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8 Background
(1) Point to point fixed services in the 1800 MHz band are generally licensed in accordance with the frequency assignment criteria set out in RALI FX 3. RALI FX 3 provides details about channel plans for individual microwave bands, and guidance on interference criteria and frequency coordination between microwave links to achieve certain performance objectives. It provides assignment criteria for each frequency band and specifies protection ratios. The criteria are usually based on accepted ITU-R Recommendations. (2) RALI FX 3 is subject to continuing review in consultation with industry, to incorporate improved assignment techniques and changing technology requirements. Particular account is taken of changes in ITU-R Recommendations, and standards made by other bodies. As revisions seek to improve spectrum access opportunities, without causing undue detriment to existing licences, users of RALI FX 3 should consult the current version when planning systems, to increase spectrum productivity.