3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
A1.1.1 Outdoor test site and general arrangements for measurements involving the use of radiated fields (GC4)
The outdoor test site shall be on a reasonably level surface or ground. At one point on the site a ground plane of at least 5 m diameter shall be provided. In the middle of this ground plane a non-conducting support capable of rotation through 360 degrees in the horizontal plane shall be used to support the test sample at 1,5 m above the ground plane.
The test site shall be large enough to allow the erection of a measuring or transmitting antenna at a distance of half a wavelength or at least 3 m whichever is the greater. Sufficient precautions shall be taken to ensure that reflections from extraneous objects adjacent to the site and ground reflections do not degrade the measurement results.
The test antenna is used to detect the radiation from both the test sample and the substitution antenna, when the site is used for radiation measurements. Where necessary the substitution antenna is used as a transmitting antenna, when the site is used for the measurement of receiver characteristics. This antenna is mounted on a support such as to allow the antenna to be used in either the horizontal or vertical polarization and for the height of its centre above ground to be varied over the range 1 m to 4 m. Preferably test antennas with pronounced directivity should be used. The size of the test antenna along the measurement axis shall not exceed 20 % of the measuring distance.
For radiation measurements the test antenna is connected to a test receiver capable of being tuned to any frequency under investigation and of measuring accurately the relative levels of signals at its input. When necessary (for receiver measurements) the test receiver is replaced by a signal source.
The substitution antenna shall be a half wave dipole, resonant at the frequency under consideration, or a shortened dipole, or (in the range 1 GHz to 4 GHz) a horn radiator. Antennas other than a half wave dipole shall have been calibrated to the half wave dipole. The centre of this antenna shall coincide with the reference point of the test sample it has replaced. This reference point shall be the volume centre of the sample when its antenna is mounted inside the cabinet, or the point where an external antenna is connected to the cabinet. The distance between the lower extremity of the dipole and the ground shall be at least 30 cm.
The substitution antenna shall be connected to a calibrated signal generator when the site is used for radiation measurements and to a calibrated measuring receiver when the site is used for measurements of receiver characteristics. The signal generator and the receiver shall be operating at the frequencies under investigation and shall be connected to the antenna through suitable matching and balancing network.
A1.1.2 Anechoic shielded chamber (GC5)
As an alternative to the above mentioned outdoor test site an indoor test site, being a well shielded anechoic chamber simulating free space environment may be used. If such a chamber is used, this shall be recorded in the test report.
NOTE: The anechoic shielded chamber is the preferred test site for testing to the present document.
The measurement site may be an electrically shielded anechoic chamber being 10 m long, 5 m broad and 5 m high. Walls and ceiling should be coated with RF absorbers of 1 m height. The ground should be covered with absorbing material 1 m thick able to carry test equipment and operators. A measuring distance of 3 m to 5 m in the long middle axis of the chamber can be used for measurements up to at least 10 GHz.
The test antenna, test receiver, substitution antenna and calibrated signal generator are used in a way similar to that of the outdoor test site method with the exception that, because the floor absorbers reject floor reflections, the antenna height need not be changed and shall be at the same height as the test sample. In the range between 30 MHz and 100 MHz some additional calibration may be necessary.
A1.1.3 Temporary antenna connector (GC7)
If the MS to be tested does not normally have a permanent external 50 connector then for test purposes only it may be modified to fit a temporary 50 antenna connector.
The permanent integral antenna shall be used for measurement of:
– Transmitter effective radiated power (subclause 13.3).
– Radiated spurious emissions (clause 12).
For tests in the relevant MS Receive band:
– The temporary antenna coupling factor is determined using the procedure defined in annex 1, subclause 1.1.5. When using the temporary antenna connector, the temporary antenna coupling factor needs to be taken into consideration when determining a stimulus or measured level in the receive band.
For tests in the relevant MS Transmit band:
– The temporary antenna coupling factor is determined using the procedure defined in subclause 220.127.116.11 When using the temporary antenna connector, the temporary antenna coupling factor needs to be taken into consideration when determining a stimulus or measured level in the transmit band.
For frequencies outside the above mentioned relevant bands the temporary antenna coupling factor is assumed to be 0 dB.
NOTE 1: The uncertainty in the determined value of the temporary antenna coupling factor is directly related to the uncertainty of the field strength value measured in subclause 18.104.22.168 step n) and annex 1, subclause 22.214.171.124 (approximately ±[3 dB]). By mutual agreement, between the MS manufacturer and the testing authority, a value of 0 dB for the temporary antenna coupling factor could be used.
NOTE 2: The accommodation of the uncertainty in the temporary antenna coupling factor in the relevant MS receive band for the tests in clause 14 is for further study.
NOTE 3: The uncertainty in the temporary antenna coupling factor in the relevant MS transmit band can be accommodated with appropriate adjustment of the measured levels by the uncertainty.
Testing must be performed in the following order to ensure that all the free field measurements are performed before the MS is modified.
– Subclause 12.1.2.
– Annex 1, subclauses 126.96.36.199 and 188.8.131.52.
– Subclause 184.108.40.206 (during this step the MS is modified).
– Annex 1, subclause 220.127.116.11.
– All remaining tests of clauses 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 and 22.
A1.1.4 Temporary antenna connector characteristics
The method of connection of the temporary connector shall allow secure and repeatable connections to be made to the device under test.
The antenna connector shall present a nominal 50 impedance over the GSM receive and transmit frequency ranges. The maximum loss within the frequency range 100 kHz to 12,75 GHz shall be less than 1 dB.
The connection circuitry shall be maximally broadband and shall contain no non-linear or active devices.
The characteristics of the connector shall not be significantly affected by temperatures in the range -25° to +60° Celsius.
A1.1.5 Calibration of the temporary antenna connector
For equipments fitted with an integral antenna and not provided with a permanent means for connection to an external antenna a calibration procedure is required to allow subsequent measurements to be performed on the temporary antenna connector.
Once calibrated this temporary antenna connector enables all receiver test procedures to be identical for equipments with an integral antenna and for equipments with an antenna connector.
The calibration procedure shall be carried out at three frequencies, namely an ARFCN in the low mid and high ARFCN ranges. The procedure consists of three distinct stages as follows:
1) Establish the MS antenna radiation pattern for the three selected frequencies.
2) Calibrate the test range (or anechoic shielded chamber) for the conditions needed in 1).
3) Determine the temporary antenna connector coupling factor.
A18.104.22.168 Antenna radiation pattern
a) The MS shall be in the anechoic shielded chamber, or on an outdoor test site, on an isolated support in a vertical position at an orientation specified by the manufacturer. This position is the 0° position.
A test antenna, connected to the SS shall be in the anechoic shielded chamber, or on the outdoor test site, at a distance of at least 3 m from the MS.
b) A call shall be originated by the SS to the MS on a frequency in the low ARFCN range. The MS shall be made to answer the call. The SS shall command the MS to maximum transmit power.
c) The SS shall, using estimated parameters for the outdoor test site or anechoic shielded chamber, set its output level "E" [see figure A1-1 to give an MS receiver input level of approximately 32 dBVemf. This corresponds to a field strength of 55,5 dBV/m at the MS position. The signal shall be the Standard Test Signal C1.
NOTE 1: The absolute value of the received signal level is not critical. The value suggested however will ensure that the MS receiver is operating essentially error free, yet is low enough to avoid any non linear effects in the receiver.
d) The SS shall use the RXLEV message from the MS to determine a measure of the received field strength. The procedure detailed in the flow chart of figure A1-1 shall now be followed.
The signal level from the SS that just results in the transition from RXLEVa to RXLEVb shall be recorded as Ei.
NOTE 2: The actual values of RXLEVa and RXLEVb will need to be recorded, because this transition will be used as the reference point for all further stages of the calibration procedure.
e) Step d) shall be repeated after the MS has been rotated by n 45° in the horizontal plane. Ensuring that the same RXLEV transition is used, the signal levels from the SS shall be recorded as Ein.
f) Calculate the effective mean signal level from the RMS value of the eight signal levels obtained in d) and e) above by using the following formula:
g) Repeat steps b) to f), except in step b) use an ARFCN in the mid ARFCN range to obtain a mean signal level E2. Ensure the same RXLEV transition is used.
h) Repeat steps b) to f), except in step b) use an ARFCN in the high ARFCN range to obtain a mean signal level E3.
Ensure the same RXLEV transition is used.
A22.214.171.124 Test range calibration
The objective of this step is to determine the actual field strength at the MS corresponding to the three signal levels E1, E2 and E3 established in annex 1, subclause 126.96.36.199. The following procedure shall be used:
a) Replace the MS by a calibrated reception antenna connected to a measuring receiver.
b) For each frequency used in annex 1, subclause 188.8.131.52 measure the field strength Efr corresponding to the respective signal levels Er determined in steps f), g) and h) of annex 1, subclause 184.108.40.206 record these values as Ef1, Ef2, Ef3.
A220.127.116.11 Temporary antenna connector coupling factor
The coupling factor of the temporary antenna connector is the relationship expressed in dB, between the output signal of the SS and the effective receiver input signal for the MS.
The test sample MS is modified to fit a temporary antenna connector in accordance with annex 1, subclause 1.1.3. Or alternatively a second MS shall be provided, fitted with such a temporary antenna connector.
NOTE: If only one MS is supplied for testing, the tests of radiated spurious emissions (transmit and receive) and receiver sensitivity shall be performed before the MS is modified to accept a temporary antenna connector.
The calibration procedure shall be as follows:
a) The MS temporary connector is connected to the output of the SS.
b) A call shall be originated by the SS to the MS using a frequency in the low ARFCN range. The MS shall be made to answer the call. The SS shall command the MS to maximum transmit power, non hopping encrypted mode.
c) The SS shall, using the procedures of annex 1, subclause 18.104.22.168, adjust its output signal level to determine the RXLEVa to RXLEVb transition. This signal level shall be recorded as Ec1.
d) Repeat steps b) and c) for frequencies in the mid ARFCN range and the high ARFCN range. Record the RXLEV transitions as Ec2 and Ec3 respectively.
e) The temporary antenna connector coupling factor F is then calculated from:
where Kn = conversion factor of an isotropic antenna expressed as V at the frequency V/m corresponding to the ARCFN used.
f) The mean antenna coupling factor Fm to be used for measurements requiring hopping shall be calculated from the RMS value of all parameters in e) as follows:
g) In all tests in which a MS with integral antenna is the unit under test, the signal level at the temporary antenna connector is determined from:
– Ein = Ereq + F;
– Ein = signal level at coupling device (dBVemf);
– Ereq = signal level required by the test (dBVemf);
– F = coupling factor at the respective ARFCN (dB).
This is indicated in the test procedures as Ereq, dBVemf( ), where the empty parenthesis is to be read as Ein.
For frequencies not in the receive band or the transmit band, 0dBi antenna gain shall be assumed.]
A1.1.6 Connection of devices with multiple antennae
Devices with multiple antennae must be connected in well defined manner in order for test requirements to be considered valid. This applies equally to those tests which are specifically testing these requirements associated with a device with multiple antennae, as those which are not.
A22.214.171.124 DARP phase 2 MS
For those tests which are specifically designed for DARP phase 2 MS, the SS must present signals to, and connect to the MS in a manner specified in TS 45.005 Annex N.2. Additionally, the SS must be able to accommodate the MS transmission being on either one or both or these antennae, or indeed an alternative antenna.
A126.96.36.199 VAMOS III MS
For those tests which are specifically designed for VAMOS III MS, the SS must present signals to, and connect to the MS in a manner specified in TS 45.005 Annex Q.7. Additionally, the SS must be able to accommodate the MS transmission being on either one or both or these antennae, or indeed an alternative antenna.