7Background

7 Background

(1) The 1800 MHz spectrum licences have been allocated in relation to geographic areas in capital cities and in regional areas. Apparatus licensed and class licensed radiocommunications transmitters communicate with radiocommunications receivers in and adjacent to the 1800 MHz band. These receivers may suffer interference from radiocommunications transmitters operated under an 1800 MHz spectrum licence. (2) This instrument has been made to provide guidance on the management of interference from radiocommunications transmitters operated under an 1800 MHz spectrum licence to apparatus licensed radiocommunications receivers operating in the following circumstances: (a) point to point fixed services operating in and adjacent to the 1800 MHz band (Part 3); (b) meteorological-satellite services operating at frequencies below 1710 MHz (Part 4); (c) cordless communications devices authorised by the Cordless Devices Class Licence and operating in the 1880 MHz to 1900 MHz frequency band (Part 5); (d) public mobile telecommunications services operating in the 1800 MHz band outside the geographic areas of 1800 MHz spectrum licences (Part 7). (3) This instrument also provides advice on the following: (a) the protection of radio astronomy services operating in the 1250 MHz to 1780 MHz frequency band on a fortuitous basis (Part 6); (b) the co-existence arrangements between public mobile telecommunications service networks and GSM-R technologies, operating under 1800 MHz spectrum licences (Part 8). (4) 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 1800 MHz band.

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

Note 2: The use of other published propagation models applicable to the 1800 MHz band may also be suitable.

(5) The ACMA may take this instrument into account in determining whether a radiocommunications transmitter operated under an 1800 MHz spectrum licence is causing interference to an apparatus licensed or class licensed radiocommunications receiver operating in circumstances set out in this instrument. (6) This instrument does not prevent a person negotiating and implementing other protection requirements with other persons.