Radiocommunications (Unacceptable Levels of Interference — 800 MHz Band) Determination 2012
Radiocommunications Act 1992
The AUSTRALIAN COMMUNICATIONS AND MEDIA AUTHORITY makes this Determination under subsection 145 (4) of the Radiocommunications Act 1992.
Dated 15 August 2012
Chris Chapman
[signed]
Member
Richard Bean
[signed]
Member/General Manager
Australian Communications and Media Authority
1 Name of Determination
This Determination is the Radiocommunications (Unacceptable Levels of Interference – 800 MHz Band) Determination 2012.
2 Commencement
This Determination commences on 18 June 2013.
3 Revocation
The Radiocommunications (Unacceptable Levels of Interference - 800 MHz Band) Determination 2000 is revoked.
4 Purpose
This Determination is made for the purposes of section 145 of the Act and sets out what is an unacceptable level of interference caused by a radiocommunications transmitter operating under a spectrum licence issued in the 800 MHz band, so as to ensure that high levels of emission from radiocommunications transmitters operated under a spectrum licence are kept within the geographic area and frequency band of the licence.
Note 1 Under section 145 of the Act, the ACMA may refuse to register a radiocommunications transmitter if it is satisfied that the operation of the radiocommunications transmitter under a spectrum licence could cause an unacceptable level of interference to the operation of other radiocommunications devices under that or any other spectrum licence, or any other licence.
Note 2 The ACMA information paper, Registration of radiocommunications devices under spectrum licences, (available on the ACMA website), provides further information about the registration of radiocommunications transmitters under Part 3.5 of the Act.
Note 3 The ACMA has issued written advisory guidelines under section 262 of the Act about compatibility requirements in relation to the assignment of frequencies to radiocommunications transmitters operated under apparatus licences and the operation of radiocommunications transmitters under spectrum licences. The ACMA may take these guidelines into account during the settlement of interference disputes. Each case will be assessed on its merits. The guidelines do not prevent a licensee negotiating other compatibility requirements with another licensee. The guidelines are:
· Radiocommunications Advisory Guidelines (Managing Interference to Spectrum Licensed Receivers — 800 MHz Band) 2012; and
· Radiocommunications Advisory Guidelines (Managing Interference from Spectrum Licensed Transmitters — 800 MHz Band) 2012.
These instruments can be accessed on the ComLaw website: www.comlaw.gov.au.
5 Interpretation
In this Determination, unless the contrary intention appears:
800 MHz band means the following frequency bands:
(a) 825 MHz - 845 MHz (the 800 MHz Lower band); and
(b) 870 MHz - 890 MHz (the 800 MHz Upper band).
Act means the Radiocommunications Act 1992.
centre frequency, in relation to a radiocommunications transmitter, means the frequency midway between the lower and upper frequency limits of the transmitter’s occupied bandwidth.
DEM-9S means the “GEODATA 9 Second Digital Elevation Model (DEM-9S) Version 3” (Australia New Zealand Land Information Council unique identifier ANZCW0703011541) containing modelled terrain height information for Australia, published by Geoscience Australia, as in force from time to time.
Note Copies of the DEM-9S can be obtained from Geoscience Australia: www.ga.gov.au.
DEM-9S cell means an individual height element of the DEM-9S.
device boundary, in relation to a radiocommunications transmitter or a group of radiocommunications transmitters operated under a spectrum licence, means the device boundary calculated in accordance with Part 1 of Schedule 2.
device boundary criterion means the value of the mathematical expression calculated in accordance with Part 2 of Schedule 2.
effective antenna height means the effective height of an antenna calculated in accordance with Schedule 3.
EIRP, in relation to a radiocommunications device, means the Effective Isotropic Radiated Power of the device.
emission designator means the designation of a radiocommunications transmitter’s emission, determined in accordance with section 6.
fixed receiver means a radiocommunications receiver located at a fixed point on land or sea and not designed or intended for use while in motion.
fixed transmitter means a radiocommunications transmitter located at a fixed point on land or sea and not designed or intended for use while in motion.
Geocentric Datum of Australia 1994 means the geodetic datum designated as the “Geocentric Datum of Australia (GDA94)” gazetted in the Commonwealth of Australia Gazette No. GN 35 on 6 September 1995.
Note The Geocentric Datum of Australia 1994 is a coordinate reference system which replaces the Australian Geodectic Datum. More information on the GDA94 can be obtained from Geoscience Australia: www.ga.gov.au.
geographic area, for a spectrum licence, means the area within which operation of a radiocommunications device is authorised under the licence.
group of radiocommunications receivers has the meaning given by section 8.
group of radiocommunications transmitters has the meaning given by section 7.
horizontally radiated power, for a radiocommunications device, means the sum of:
(a) the maximum true mean power, in dBm per specified rectangular bandwidth at the antenna connector that is located within the frequency band of the spectrum licence authorising the operation of the radiocommunications device; and
(b) the antenna gain relative to an isotropic antenna in a specified direction in the horizontal plane containing the phase centre of the antenna used with the device, in dBi.
location, in relation to a radiocommunications transmitter or group of radiocommunications transmitters, means the location of the transmitter or group of radiocommunications transmitters, as the case may be, calculated in accordance with Schedule 1.
maximum true mean power means the true mean power measured in a specified rectangular bandwidth that is located within a specified frequency band such that the true mean power is the maximum of true mean powers produced.
Note The power within a specified bandwidth is normally established by taking measurements using either an adjacent channel power meter or a spectrum analyser. The accuracy of measuring equipment, measurement procedure and any corrections to measurements necessary to take account of practical filter shape factors would normally be in accordance with standard engineering practice.
mean power means the average power measured during an interval of time that is at least 10 times the period of the lowest modulation frequency.
mobile transmitter means a radiocommunications transmitter that is only designed or intended for use while in motion or during halts at unspecified points on land or sea.
occupied bandwidth, in relation to a radiocommunications transmitter, means the width of a frequency band having upper and lower limits that are necessary to contain 99% of the true mean power of the transmitter’s emission at any time.
Radio Regulations means the ‘Radio Regulations’ published by the International Telecommunication Union, as in force from time to time.
Note Copies of the Radio Regulations can be obtained from the ITU: www.itu.int.
true mean power means:
(a) if an unmodulated carrier is present — the mean power measured while the unmodulated carrier is present; and
(b) if an unmodulated carrier is not present — the mean power measured while transmitted information is present.
Note A number of terms used in this Determination are defined in the Act and, unless the contrary intention appears, have the meanings given to them by the Act:
· ACMA
· core condition
· frequency band
· interference
· radiocommunications device
· radiocommunications receiver
· radiocommunications transmitter
· radio emission
· Register
· spectrum licence
6 Emission designator
(1) In this Determination, the designation of a radiocommunications transmitter’s emission (emission designator) is determined using the methods specified in the Radio Regulations.
(2) For the purpose of determining the designation of a radiocommunications transmitter’s emission using the methods specified in the Radio Regulations, the references to necessary bandwidth for a given class of emission are taken to be references to the occupied bandwidth of the transmitter.
Note At the date of making this Determination, Appendix 1 of the Radio Regulations made provision for determining the designation of a radiocommunications transmitter’s emission.
7 Group of radiocommunications transmitters
(1) In this Determination, two or more fixed transmitters are a group of radiocommunications transmitters if:
(a) they have the same centre frequency and emission designator;
(b) they are operated for the purpose of communicating with the same radiocommunications receiver or group of radiocommunications receivers;
(c) each has an antenna of the same type, model and manufacturer;
(d) the antenna used with each fixed transmitter is located on the same structure and within 20 metres of the phase centre of all antennas within the group of radiocommunications transmitters; and
(e) the identification number assigned by the ACMA to the antenna used with each radiocommunications transmitter is the same.
(2) A radiocommunications transmitter must not belong to more than one group of radiocommunications transmitters.
(3) The location of a group of radiocommunications transmitters is calculated in accordance with Schedule 1.
8 Group of radiocommunications receivers
(1) In this Determination, two or more fixed receivers are a group of radiocommunications receivers if:
(a) they are operated for the purpose of communicating with the same radiocommunications transmitter or group of radiocommunications transmitters;
(b) each has an antenna of the same type, model and manufacturer;
(c) the antenna used with each fixed receiver is located on the same structure and within 20 metres of the phase centre of all antennas within the group of radiocommunications receivers; and
(d) the identification number assigned by the ACMA to the antenna used with each radiocommunications receiver is the same.
(2) A radiocommunications receiver must not belong to more than one group of radiocommunications receivers.
(3) The location of a group of radiocommunications receivers is calculated in accordance with Schedule 1 as if the group of receivers were a group of radiocommunications transmitters.
9 Unacceptable level of interference
A level of interference caused by a radiocommunications transmitter operated under a spectrum licence issued for the 800 MHz band is unacceptable if:
(a) the operation of the transmitter in the 800 MHz band results in a breach of a core condition of the licence relating to the maximum permitted level of radio emission from the transmitter:
(i) outside the part or parts of the spectrum the use of which is authorised under the licence; or
(ii) outside the geographic area of the licence;
(b) any part of the device boundary of the transmitter lies outside of the geographic area of the licence;
(c) the device boundary of the transmitter cannot be calculated in accordance with Part 1 of Schedule 2;
(d) the transmitter only operates in the 800 MHz Lower band and its antenna has an effective antenna height for any radial n, he1(fn) greater than 10 metres; or
(e) the transmitter is a mobile transmitter that operates in the 800 MHz band with a horizontally radiated power greater than 30dBm EIRP per 1 MHz.
Note Subsection 66 (1) of the Act provides that a spectrum licence must include core conditions specifying the maximum permitted level of radio emissions that may be caused by the operation of radiocommunications devices under the licence (see paragraphs 66 (1) (b) and (d) of the Act).
10 Accuracy
Unless otherwise specified, the value of a parameter in Schedules 1, 2, 3, 4 and 5 must be estimated with a level of confidence not less than 95 percent that the true value of the parameter will always remain below the requirement specified in this Determination.
Schedule 1 Location of a transmitter
(section 5)
1. The location of a radiocommunications transmitter, (lt, Lt) is the location (by latitude and longitude with reference to the Geocentric Datum of Australia 1994) of the phase centre of the radiocommunications transmitter’s antenna.
2. The location of a group of radiocommunications transmitters, (lt, Lt) is the location (by latitude and longitude with reference to the Geocentric Datum of Australia 1994) of the centre point between the phase centre of each radiocommunications transmitter antenna within the group.
3. In determining the location of a radiocommunications transmitter, or a group of radiocommunications transmitters, the measurement error should be less than 10 metres.
Note 1 The ACMA issues site identifiers for established radiocommunications locations available in the Register.
Note 2 The ACMA provides advice on its website to assist licensees in determining the location and measurement error of a transmitter site in the document Business Operating Procedure (BOP) – Radiocommunications site data requirements.
Schedule 2 Device boundaries
(section 5)
Part 1 Device boundary of a transmitter
1. The device boundary of a single radiocommunications transmitter is established as follows:
Step 1: Calculate the device boundary criterion at each m×500 metre increment along each of the n-degree radials, where:
(a) m is the values 1 through 170; and
(b) n is the values 0 (true north) through 359.
Step 2: For each radial, find the latitude and longitude of the first point (lowest value of m) where either:
(a) RP-MP is less than or equal to 0; or
(b) m is equal to 170.
Step 3: The end point of each radial is the device boundary of the radiocommunications transmitter.
Note RP-MP is calculated under Part 2.
2. For a group of radiocommunications transmitters the device boundary is to be calculated as if for a single radiocommunications transmitter. The radiated power (RP) for groups of radiocommunications transmitters is taken:
(a) to be equal for each bearing σn; and
(b) to have a value that is the maximum horizontally radiated power, in any direction, of any radiocommunications transmitter in the group.
Part 2 Device boundary criterion
The device boundary criterion is the value of the mathematical expression:
RP-MP
where:
MP
:
is PL(lmn,Lmn) + LOP - Gr
RP
:
is the radiated power, measured in dBm EIRP per 1 MHz, for each bearing, σn, expressed as:
HRP + E – 0.8,
HRP
:
is the horizontally radiated power, measured in dBm EIRP per 1 MHz, for each bearing, σn,
LOP
:
is the radiocommunications receiver level of protection, measured in dBm per 1 MHz, set to - 111dBm per MHz for the 800 MHz Upper band and - 115dBm per MHz for the 800 MHz Lower band,
Gr
:
is the nominal radiocommunications receiver antenna gain including feeder loss set to 0dBi for the 800 MHz Upper band and 13dBi for the 800 MHz Lower band,
PL(lmn, Lnm)
:
is the propagation loss (dB) set out in Part 3 of the mth increment on the nth radial.
Part 3 Calculation of propagation loss
1. In calculating PL(lmn, Lnm):
f
:
is the centre frequency of the radiocommunications transmitter in megahertz (MHz).
hgr
:
is the nominal receiver antenna height above ground level.
:
is the transmitter effective antenna height (in metres) as defined in Schedule 3, except:
if < 1.5 metres, then = 1.5 metres; or
if > 500 metres then = 500 metres.
d(lmn, Lmn)
:
is the distance in kilometres between the location of the radiocommunications transmitter, (lt, Lt), and the mth increment on the nth radial (lmn, Lmn).
2. The propagation loss for the mth increment on the nth radial is established as follows:
Step 1: Calculate the parameters required:
Step 2: Calculate the propagation loss for the mth increment on the nth radial:
Note 1 The formula in Step 1 and Step 2 use Modified Hata propagation from ‘ERC Report 068’ published by the European Conference of Postal and Telecommunications Administrations (CEPT) in 2000 and revised in 2002.
Note 2 Radiocommunications receivers may be registered in the 800 MHz Lower band by treating the receiver as if it were a radiocommunications transmitter in the propagation loss calculations stated above and application of suitable values of HRP and level of protection in the RP-MP criterion.
3. For the purpose of calculating the device boundary criterion:
(a) the propagation loss and Maximum Power (MP) function for the 800 MHz Lower band is calculated in accordance with Schedule 4; and
(b) the propagation loss and Maximum Power (MP) function for the 800 MHz Upper band is calculated in accordance with Schedule 5.
Schedule 3 Effective antenna height and average ground height
(section 5)
Part 1 Effective antenna height of a transmitter
1. If:
(a) hgt is the vertical height in metres of the phase centre of the fixed transmitter’s antenna measured with an error of less than 5 parts in 100 and relative to the point:
(i) located on the line of intersection between the external surface of the structure supporting the antenna and the surface of the ground or sea; and
(ii) having the lowest elevation on that line;
(b) hsis the sum of the DEM-9S cell height of the location of the
radiocommunications transmitter as defined in Schedule 1 and hgt; and
(c) is the average ground height of the DEM-9S at each m-increment on each n-radial as calculated in accordance with Part 2;
then the effective antenna height is (as shown in Diagram 1) except when is less than , in which case is .
2. For a group of radiocommunications transmitters, hgt is the greatest of the hgt for each individual transmitter in the group, calculated as in 1(a).
3. If the latitude or longitude of the radiocommunications transmitter as defined in Schedule 1 has a modulus of zero when divided by 0.0025, then hsis the sum of hgt and the maximum height of the adjacent DEM-9S cells.
Note Additional information for the purpose of calculating hs where the latitude or longitude of the radiocommunications transmitter as defined in Schedule 1 corresponds to a DEM-9S cell boundary is provided in the document titled ‘Digital Elevation Model Interpretation’ available on the ACMA website.
Diagram 1 Calculating effective antenna height
mean sea level
Part 2 Average ground height
1. The average ground height for the mth increment on the nth radial is calculated as follows:
Step 1: determine the associated latitude and longitude of the mth increment on the nth radial as calculated in Part 3.
Step 2: identify the DEM-9S cell represented by the latitude and longitude of the mth increment on the nth radial.
Step 3: bound the identified DEM-9S cell with the 8 adjacent DEM-9S cells in a 3x3 matrix and obtain each DEM-9S cell height attribute (as shown in Diagram 2).
Step 4: determine the average value of height from the 3x3 matrix.
2. If the latitude or longitude of the mth increment on the nth radial as calculated in Part 3 has a modulus of zero when divided by 0.0025, then the corresponding DEM-9S cell as identified in Step 2 above, is the minimum height of the adjacent DEM-9S cells.
Note Additional information where the associated latitude or longitude of the mth increment on the nth radial as calculated in Part 3 corresponds to a DEM-9S cell boundary is provided in the document titled ‘Digital Elevation Model Interpretation’ available on the ACMA website.
Diagram 2 Calculating average ground height
Part 3 Vincenty’s Formulae
Note This implementation of Vincenty’s Direct Formulae uses the parameters from the GRS80 ellipsoid as referenced by the Geocentric Datum of Australian 1994 (GDA94).
1. In calculating:
lt
:
is the latitude of the fixed transmitter (decimal degrees)
Lt
:
is the longitude of the fixed transmitter (decimal degrees)
α
:
is the azimuth angle (decimal degrees)
d
:
is the separation distance to required point (m×500 metres)
a
:
is the semi-major axis of (6378137 metres)
fl
:
is the flattening of (1/298.25722210)
b
:
is the semi-minor axis of (a×(1-fl))
2. Using an initial value, iterate the following three equations until the change in ϕ is less than 10-12.
3. Then:
Schedule 4 Propagation loss - Maximum Power (MP) Function – 800 MHz Lower Band
For the purpose of calculating the device boundary criterion in Schedule 2, the propagation loss and Maximum Power (MP) function for the 800 MHz Lower band is calculated as set out below.
For simplification let:
dm(fn) = d; and
hem(fn) = he.
If he 500m then he = 500m.
The propagation loss in the 800 MHz Lower band is calculated using the following equation:
Where
Where the MP function in the lower band is calculated by adding the level of protection to the propagation loss:
Schedule 5 Propagation loss – Maximum Power (MP) Function – 800 MHz Upper Band
For the purpose of calculating the device boundary criterion in Schedule 2, the propagation loss and Maximum Power (MP) function for the 800 MHz Upper band is calculated as set out below.
For simplification let:
dm(fn) = d ; and
hem(fn) = he.
If he 500m then he = 500m.
The propagation loss in the 800 MHz Upper band is calculated using the following equation:
Where
Where the MP function in the upper band is calculated by adding the level of protection to the propagation loss:
