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4.4 Recommendation 4
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- To consider adopting the rule that, in faded conditions, the DAQ 3.4 (BER 2%) coverage area contour (106dBm) of a service should be at least 5 km away from a base station operating in the 1st adjacent channel.
The majority of reviewers agree with the proposed recommendation.
One reviewer proposed applying an additional engineering rule to address ambiguities in regards to fortuitous coverage. It suggests that the determination of the faded -106 dBm coverage contour can be a difficult task considering the New Zealand topography. It was proposed that, in addition to recommendation 4, it would be necessary to implement a rule to exclude fortuitous coverage from interference protection.
Another reviewer suggested that diverse local topography impacts coverage contours and that adjacent channel interference issues should be resolved by Approved Persons based on their experience.
PIB 38 (Sections 3.3 & 3.7) prescribes guidelines to help Approved Persons in making a professional judgement when determining the compatibility of new and existing mobile radiocommunications services. This approach was adequate when a single analogue equipment standard was in use. However, to ensure coexistence between TETRA and APCO/ analogue services, a more precise approach is considered necessary to provide a reasonable expectation for frequency re-use.
