7Background

7 Background

(1) The 3.4 GHz band has been allocated for spectrum licensing in specified parts of Australia. Spectrum licensed, apparatus licensed and class licensed radiocommunications transmitters communicate with radiocommunications receivers in and adjacent to the 3.4 GHz band. These receivers may suffer interference from unwanted emissions, blocking and intermodulation caused by a 3.4 GHz transmitter. (2) This instrument has been made to provide guidance on the management of interference from 3.4 GHz transmitters operated under a 3.4 GHz spectrum licence to radiocommunications receivers operating in the following circumstances: (a) as part of point to point fixed services on frequencies in and adjacent to the 3.4 GHz band (Part 3); (b) as fixed-satellite service earth receive stations operating in the 3400 MHz to 4200 MHz frequency band (Part 4); (c) as part of point to multipoint services in the 3400 MHz to 3700 MHz frequency band (Part 5); (d) as part of radiolocation services in the 3300 MHz to 3400 MHz frequency band, or the 3400 MHz to 3600 MHz frequency band (Part 6); (e) as authorised by a class licence, or to receive transmissions from a radiocommunications transmitter operated in accordance with a class licence (Part 7); (f) as spectrum licensed receivers in areas adjacent to the 3.4 GHz spectrum licence (Part 8); (g) in earth station protection zones (Part 9); (h) at an earth station facility near Uralla, New South Wales (Part 10); (i) as part of highly localised wireless broadband services provided under fixed licences (Part 11); (j) as authorised by area-wide licences in the 3400 MHz to 4000 MHz frequency band, adjacent to the 3.4 GHz spectrum licence (Part 12); (k) as authorised by area-wide licences in areas adjacent to the 3.4 GHz spectrum licence (Part 13); (l) as part of aeronautical mobile and aeronautical radionavigation services in the 4200 MHz to 4400 MHz frequency band (Part 14). (3) As radio waves propagate in different ways because of factors such as frequency, terrain, atmospheric conditions and topography, there are a number of ways to predict path loss. The ITU-R Recommendation P.1144 “Guide to the application of the propagation methods of Radiocommunication Study Group 3” provides a guide on the application of various propagation methods developed by the Radiocommunication Sector of the International Telecommunication Union. It advises on the most appropriate methods for particular applications, as well as the limits, required input information and output for each of these methods. The most recent version of propagation models developed by the Radiocommunication Sector of the International Telecommunication Union should be considered when modelling propagation in the 3.4 GHz band.

Note 1: ITU-R Recommendation P.1144 is available, free of charge, from the International Telecommunication Union’s website at .