6 Transmitter

11.213GPPBase Station System (BSS) equipment specificationRadio aspectsRelease 1999TS

All tests in this Clause shall be conducted on Base Station Systems fitted with a full complement of Transceivers for the configuration unless otherwise stated. Measurements shall be made at the BTS Tx antenna connector, unless otherwise stated.

Power levels are expressed in dBm.

6.1 Static Layer 1 functions

6.1.1 Test purpose

To verify the following static Layer 1 transmitter functions:

1) the RF equipment;

2) the multiplexing and multiple access functions;

3) the interleaving and the channel encoding on the transmit side.

6.1.2 Test case

The BSS shall be configured with the maximum number of TRXs, with ARFCNs which shall be distributed over the entire declared bandwidth of operation for the BSS under test. One TRX shall be configured to support the BCCH. If the manufacturer declares that slow frequency hopping is supported, this shall be enabled.

Each TRX shall transmit a normal GSM modulated signal and the BSSTE shall be connected to the transmitter antenna connector. A known bit sequence exceeding a length of a superframe (1326 TDMA‑frames) shall be input before channel encoding in the BSS and a bit sequence shall be output after channel decoding in the BSSTE.

All logical channel types supported by the BSS shall be tested. The test shall be repeated for each TRX in the BSS configuration, for each logical channel supported by it.

NOTE: Some logical channels are only supported by the TRX configured to support the BCCH.

6.1.3 Essential conformance

This test need not be performed.

6.1.4 Complete conformance

Test Environment

Normal.

Conformance requirement

The output bit sequence shall be bit exact for all logical channel types.

6.1.5 Requirement reference

GSM 05.01 [3], GSM 05.02 (ETS 300 908) [4], GSM 05.03 (ETS 300 909) [5] and GSM 05.05 (ETS 300 910) [7].

6.2 Modulation accuracy

6.2.1 Test purpose

1) To verify the correct implementation of the pulse shaping filtering.

2) To verify that the phase error during the active part of the time slot does not exceed the specified limits under normal and extreme test conditions and when subjected to vibration.

3) To verify that the frequency error during the active part of the time slot does not exceed the specified limits under normal and extreme test conditions and when subjected to vibration.

6.2.2 Test case

All TRXs in the configuration shall be switched on transmitting full power in all time slots for at least 1 hour before starting the test.

If the Manufacturer declares that Synthesizer Slow Frequency Hopping is supported by the BSS, the BSS shall be configured with the maximum number of TRXs with ARFCNs which shall be distributed over the entire declared bandwidth of operation for the BSS under test, and including B, M and T, and three tests shall be performed. These tests may either use a test apparatus which employs the same hopping sequence as the BSS, or a fixed frequency apparatus on the radio frequency channels B, M and T. If only Baseband SFH is supported or SFH is not supported, one test shall be performed for each of the radio frequency channels B, M and T, using different TRXs to the extent possible for the configuration. As a minimum, one time slot shall be tested on each TRX specified to be tested.

GMSK modulation

The transmitted GMSK modulated signal from the TRX under test shall be extracted in the BSSTE for a pseudo‑random known bit stream of encrypted bits into the TRX modulator (the BSSTE is defined in annex B.1). The pseudo‑random bit stream shall be any 148 bit sub‑sequence of the 511 bit pseudo‑random bit stream defined in recommendation CCITT Q.153 fascicle IV.4. This pseudo‑random bit stream may be generated by another pseudo‑random bit stream inserted before channel encoding in the TRX and shall generate at least 200 different bursts. The phase trajectory (phase versus time) for the useful part of the time slots (147 bits in the centre of the burst ‑ see GSM 05.04 (ETS 300 959) [6] and GSM 05.10 (EN 300 912) [9] for further information) shall be extracted with a resolution of at least 2 samples per modulating bit. The RF receiver parts of the BSSTE shall not limit the measurement.

The theoretical phase trajectory from the known pseudo‑random bit stream shall be calculated in the BSSTE.

The phase difference trajectory shall be calculated as the difference between the measured and the theoretical phase trajectory. The mean frequency error across the burst shall then be calculated as the derivative of the regression line of the phase difference trajectory. The regression line shall be calculated using the Mean Square Error (MSE) method.

The phase error is then finally the difference between the phase difference trajectory and its linear regression line.

8-PSK modulation

The transmitted 8-PSK modulated signal from the TRX under test shall be extracted in the BSSTE for a pseudo‑random known bit stream of encrypted bits into the TRX modulator (the BSSTE is defined in annex B.1). The pseudo‑random bit stream shall be any bit sub‑sequence of the 32767-bit pseudo‑random bit stream defined in recommendation CCITT O.151 10/1997.

The following steps 1) to 5) shall be performed according to GSM 05.05 (ETS300 910) [22] subclause 4.6.2 and annex G.

1) The RMS EVM shall be measured and calculated over the useful part of the burst (excluding tail bits) for at least 200 bursts.

2) The origin offset supression shall be measured and calculated.

3) The frequency offset shall be measured and calculated.

4) The peak EVM shall be measured and calculated. The peak EVM is the peak error deviation within a burst, measured at each symbol interval, averaged over at least 200 bursts. The bursts shall have a minimum distance in time of 7 idle timeslots between them. The peak EVM values are acquired during the useful part of the burst, excluding tail bits.

5) The 95:th percentile EVM shall be measured and calculated. The 95:th percentile EVM is the point where 95% of the individual EVM, measured at each symbol interval, is below that point. That is, only 5% of the symbols are allowed to have an EVM exceeding the 95:th-percentile point. The EVM values are acquired during the useful part of the burst, excluding tail bits, over 200 bursts.

6.2.3 Essential conformance

Test Environment

Normal: One test shall be performed on each of B, M and T.

Extreme Power supply: One test shall be performed on each of B, M and T.

NOTE: tests under extreme power supply are carried out at extreme temperature limits.

Conformance requirement

GMSK modulation

The phase error shall not exceed:

5 degrees rms

20 degrees peak

For normal and micro BTSs the mean frequency error across the burst shall not exceed:

0,05 ppm

For pico BTSs the mean frequency error across the burst shall not exceed:

0,1 ppm

8-PSK modulation

The RMS EVM values, measured after any active element and excluding the effect of passive combining equipment, shall not exceed:

Under normal conditions 7.0 %

Under extreme conditions 8.0 %

The RMS EVM values, measured after any active element and including the effect of passive combining equipment, shall not exceed:

Under normal conditions 8.0 %

Under extreme conditions 9.0 %

The origin offset suppression shall exceed:

35 dB

For normal and micro BTSs the frequency offset shall not exceed:

0,05 ppm

For pico BTSs the frequency offset shall not exceed:

0,1 ppm

The peak EVM values, excluding the effect of passive combining equipment, shall not exceed:

22 %

The 95:th percentile EVM value, excluding the effect of passive combining equipment, shall not exceed:

11 %

6.2.4 Complete conformance

Test Environment

Normal: The test shall be repeated until 3 TRXs or all TRXs (whichever is the less) have each been tested on B, M and T.

Extreme Power supply: One test shall be performed on each of B, M and T.

NOTE: tests under extreme power supply are carried out at extreme temperature limits.

Vibration : One test shall be performed on each of B, M and T.

Conformance requirement

The requirement of essential conformance shall apply.

6.2.5 Requirement reference

[GSM 05.04 (ETS 300 959) [6], clause 2; GSM 05.05 (ETS 300 910) [7], subclause 4.6; GSM 05.10 (EN 300 912) [9], subclause 5.1].

6.3 Mean transmitted RF carrier power

6.3.1 Test purpose

To verify the accuracy of the mean transmitted RF carrier power across the frequency range and at each power step.

This test is also used to determine the parameter "power level", used in subclause 6.5.1.2.

6.3.2 Test case

For a normal BTS, this measurement the power shall be measured at the input of the TX combiner or at the BSS antenna connector. For a micro‑BTS, the power shall be measured at the BSS antenna connector. The Manufacturer shall declare the maximum output power of the BSS for each supported modulation at the same reference point as the measurement is made. The TX combiner shall have the maximum number of TRXs connected to it so that the measurement can be used as a reference for the measurement of transmitted carrier power versus time in subclause 6.4.

NOTE: The value of the output power measured at the antenna connector is generally more useful for cell planning, and may be required for regulatory purposes

All TRXs in the configuration shall be switched on transmitting full power in all time slots for at least 1 hour before starting the test.

The Manufacturer shall declare how many TRXs the BSS supports:

1 TRX: The TRX shall be tested at B, M and T;

2 TRX: The TRXs shall be each be tested at B, M and T;

3 TRX or more: Three TRXs shall each be tested at B, M and T.

If the Manufacturer declares that Synthesizer Slow Frequency Hopping is supported by the BSS, the BSS shall be configured with the number of TRXs and frequency allocation defined above and SFH enabled.

The BSS under test shall be set to transmit at least 3 adjacent time slots in a TDMA‑frame at the same power level. The power level shall then be measured on a time slot basis over the useful part of one of the active time slots and the average of the logarithmic value taken over at least 200 time slots. Only active bursts shall be included in the averaging process. Whether SFH is supported or not, the measurement shall be carried out on all of the 3 frequencies in turn.

For the definition of the useful part of the time slot see figure 2, and for further details GSM 05.04 (ETS 300 959) [6] and GSM 05.10 (EN 300 912) [9]. For timing on a per time slot basis each time slot may contain 156.25 modulating bits, or 2 time slots may contain 157 and 6 time slots 156 modulating bits according to GSM 05.10 (EN 300 912) [9].

The power shall be measured at each nominal power level as specified. As a minimum, one time slot shall be tested on each TRX. Any TRX which is a dedicated BCCH shall only be tested at highest static power step.

6.3.3 Essential conformance

Test Environment

Normal: Each TRX specified in the test case shall be tested.

Extreme power supply: One TRX shall be tested, on one ARFCN, for highest static power step only.

NOTE: tests under extreme power supply are carried out at extreme temperature limits.

Conformance requirement

The BSS shall support at least Nmax steps of Static Power Control for each supported modulation with respect to the declared output power. For the modulation with the highest output power, Nmax shall be at least 6.

The static power step N has the range from the highest static power level to Nmax inclusive, where.

The Highest Static Power Level corresponds to the maximum output power declared by the manufacturer.

The power measured when the TRX is set to Highest Static Power Control Level shall have a tolerance of 2 dB under normal conditions and 2,5 dB under extreme conditions, relative to the maximum power declared by the manufacturer for the modulation under test. In this test, this measured power is termed the maximum BTS output power. Static power control shall allow the RF output power to be reduced from the maximum BTS output power for the modulation with the highest output power capability in at least 6 steps of nominally 2 dB with a tolerance of 1 dB for each modulation referenced to the previous level of the same modulation. In addition, the actual absolute output power for each supported modulation at each static RF power step (N) , with the exception below for the highest RF power level for 8-PSK, shall be 2*N dB below the maximum BTS output power for the modulation with the highest output power capability with a tolerance of 3 dB under normal conditions and 4 dB under extreme conditions.

In addition to the Static Power Control levels the BSS may utilize up to M steps of dynamic Downlink Power Control. M can have an upper limit of 0 to 15.

Dynamic Downlink power control shall allow the RF output power to be reduced in M steps with a step size of 2 dB with a tolerance of 1,5 dB referenced to the previous level.

Each dynamic Downlink Power Control level shall have a tolerance of 3 dB under normal conditions and 4 dB under extreme conditions relative to 2*Y dB below the maximum BTS output power for the modulation with the highest output power capability, where Y is the sum of the number of static and dynamic steps below Highest Static Power Control Level for the modulation with the highest output power capability.

For BTS supporting 8-PSK, the output power for both GMSK and 8-PSK shall be nominally the same for any supported static and dynamic power control level. An exception is allowed for the maximum output power of 8-PSK, which may be lower than the GMSK output power for the same static or dynamic power control level, i.e. the nominal size of the first step down from maximum power level for 8-PSK may be in the range 0 to 2 dB. The output power of 8-PSK for the second highest static or dynamic power control level shall be the same as the GMSK power for the same static or dynamic power control level within a tolerance of ±1 dB The number of static RF power steps and the total number of power control steps may be different for GMSK and 8-PSK.

6.3.4 Complete conformance

The requirement of essential conformance shall apply.

6.3.5 Requirement reference

GSM 05.05 (ETS 300 910) [7] subclause 4.1.2.

6.4 Transmitted RF carrier power versus time

6.4.1 Test purpose

To verify:

1) the time during which the transmitted power envelope should be stable (the useful part of the time slot);

2) the stability limits;

3) the maximum output power when nominally off between time slots.

It is not the purpose of this test to measure the detail of the power ramps; this is measured as adjacent channel power in subclause 6.5.

6.4.2 Test case

The Manufacturer shall declare how many TRXs the BSS supports, and declare any TRXs which are a dedicated BCCH carrier:

1 TRX: The BSS shall not be tested.

2 TRX: One TRX shall be configured to support the BCCH and the other shall be tested. Tests shall be performed on B, M and T, and both TRXs shall be tested on at least one frequency.

3 TRX: One TRX shall be configured to support the BCCH and the other two shall be tested at B, T and B, M. Tests shall be performed on B, M and T and both TRXs shall be tested on at least one frequency.

4 TRX or more: One TRX shall be configured to support the BCCH and three TRXs tested, one on B, one on M and one on T.

If the Manufacturer declares that Synthesizer Slow Frequency Hopping is supported by the BSS, the BSS shall be configured with the number of TRXs activated and frequency allocation defined above and SFH enabled. The TRX configured to support the BCCH shall not be tested.

If the TRX under test supports 8-PSK modulation, the test shall be performed at both GMSK and 8-PSK modulation.

A single time slot in a TDMA‑frame shall be activated in all TRXs to be tested, all other time slots in the TDMA‑frame shall be at Pidle.

Power measurements are made with a detector bandwidth of at least 300 kHz at the BTS antenna connector, at each frequency tested. Timing is related to T0 which is the transition time from symbol 13 to symbol 14 of the midamble training sequence for each time slot. For timing on a per time slot basis each time slot may contain 156.25 modulating symbols, or 2 time slots may contain 157 and 6 time slots 156 modulating symbols according to GSM 05.10 (EN 300 912) [9].Measurements shall be made at Pmax and Pmin. The time slots measured shall be displayed or stored for at least 100 complete cycles of the time slot power sequence for each measurement.

Pmax = Power measured in subclause 6.3 (Highest Static Power Control Level).

Pmin = the lowest static level measured in subclause 6.3.

Pidle  Pmax ‑30 dB, or Pmin ‑ 30 dB.

As a minimum, one time slot shall be tested on each TRX under test which is not a dedicated BCCH.

6.4.3 Essential conformance

Test Environment

Normal

Conformance requirement

The output power of each time slot tested relative to time shall conform with that illustrated in figure 2 and 2a. The residual output power, if a time slot is not activated, shall be maintained at, or below, the level of ‑30 dBc (300 kHz measurement bandwidth).

6.4.4 Complete conformance

The requirement of essential conformance shall apply.


Power/time mask for GSM 400, GSM 900, DCS 1800, GSM 850 and MXM 850

Power/time mask for PCS 1900 and MXM 1900

NOTE: The 0 dB reference is equal to the power Pmax or Pmin.

Figure 2: Power/time mask for power ramping of normal bursts at GMSK modulation

NOTE: The 0 dB reference is equal to the power Pmax or Pmin.

Figure 2a: Power/time mask for power ramping of normal bursts at 8-PSK modulation

6.4.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.5.1.

6.5 Adjacent channel power

The modulation, wideband noise and power level switching spectra can produce significant interference in the relevant TX and adjacent bands. The requirements for adjacent channel emissions are tested in two separate tests which intend to measure different sources of emission:

1) continuous modulation spectrum and wideband noise;

2) switching transients spectrum.

NOTE: Both requirements must be met, irrespective of the source of the emission at any particular frequency.

6.5.1 Spectrum due to modulation and wideband noise

6.5.1.1 Test purpose

To verify that the output RF spectrum due to modulation and wideband noise does not exceed the specified levels for an individual transceiver.

6.5.1.2 Test case

The system under test shall be tested with one TRX active or with the BTS equipped with only one TRX., at three frequencies (B, M and T).

a) All time slots shall be set up to transmit full power GMSK modulated with a pseudo‑random bit sequence of encrypted bits apart from time slot 0 which shall be set up to transmit at full power but may be modulated with normal BCCH data. The pseudo‑random bit sequence may be generated by another pseudo‑random bit sequence inserted before channel encoding in the BSS.

b) The power level (as used in table 5) shall be measured using the method of subclause 6.3 for each power step to be tested.

c) Using a filter and video bandwidth of 30 kHz the power shall be measured at the antenna connector on the carrier frequency. The measurement shall be gated over 50 ‑ 90 % of the useful part of the time slot excluding midamble, and the measured value over this part of the burst shall be averaged. The averaging shall be over at least 200 time slots and only the active burst shall be included in the averaging process. The test is performed on one timeslot and not on timeslot 0.

d) Step c) shall be repeated with the following offsets above and below the carrier frequency:

– 100, 200, 250, 400 kHz; and

– 600 to 1 800 kHz in steps of 200 kHz.

e) With all time slots at the same power level, step c) and d) shall be repeated for all static power levels specified for the equipment (subclause 6.3).

f) With a filter and video bandwidth of 100 kHz and all time slots active, the power shall be measured at the antenna connector for frequency offsets beyond 1800 kHz up to 2 MHz outside either side of the relevant TX band. This test shall be made in a frequency scan mode, with a minimum sweep time of 75 ms and averaged over 200 sweeps.

g) With all time slots at the same power level, step f) shall be repeated for all static power levels specified for the equipment (subclause 6.3).

h) If the TRX supports 8-PSK modulation, step a) to g) shall be repeated with all time slots set up to transmit 8-PSK modulation apart from timeslot 0 which may be modulated with normal BCCH data.

6.5.1.3 Essential Conformance

Test Environment

Normal

Normal BTS Conformance requirement

The test shall be performed for one TRX.

For each static power step, the power measured in steps d) to g) of the test cases shall not exceed the limits shown in table 5 for the power level measured in step b), except where one or more of the following exceptions and minimum measurement levels applies:

1) For a GSM 400, GSM900, GSM 850 or MXM 850 BTS, if the limit according to table 5 is below ‑65 dBm, a value of ‑65 dBm shall be used instead.

2) For a DCS 1800, PCS 1900 or MXM 1900 BTS, if the limit according to table 5 is below ‑57 dBm, a value of ‑57 dBm shall be used instead.

3) In the combined range 600 kHz to 6 MHz above and below the carrier frequency, in up to three bands of 200 kHz width centred on a frequency which is an integer multiple of 200 kHz, exceptions at up to ‑36 dBm are allowed.

4) Above 6 MHz offset from the carrier frequency, in up to 12 bands of 200 kHz width centred on a frequency which is an integer multiple of 200 kHz, exceptions at up to ‑36 dBm are allowed.

Table 5: Continuous modulation spectrum ‑ maximum limits for BTS

Power

level

Maximum relative level (dB) at specified carrier offsets (kHz),

using specified measurement (filter)bandwidths (kHz):

(dBm)

100

200

250

400

600 to

< 1 200

1 200 to

< 1 800

1 800 to

< 6 000

>6000

as measured in step b)

Measurement (filter)bandwidth;

30 kHz

Measurement (filter)

bandwidth; 100 kHz

 43

+0,5

‑30

‑33

‑60*

‑70

‑73

‑75

‑80

41

+0,5

‑30

‑33

‑60*

‑68

‑71

‑73

‑80

39

+0,5

‑30

‑33

‑60*

‑66

‑69

‑71

‑80

37

+0,5

‑30

‑33

‑60*

‑64

‑67

‑69

‑80

35

+0,5

‑30

‑33

‑60*

‑62

‑65

‑67

‑80

 33

+0,5

‑30

‑33

‑60*

‑60

‑63

‑65

‑80

* For equipment supporting 8-PSK, the requirement at 8-PSK modulation is -56 dB.

The limit values in table 5, at the listed offsets from carrier frequency (kHz), are the ratio of the measured power to the measured power in step c) for the same static power step.

Table 5 provides requirements at discrete power levels. For powers between those specified, linear interpolation should be applied.

Micro and Pico‑BTS Conformance requirement

The test shall be performed for one TRX.

For each static power step, the power measures in steps d) and e) of the test case shall not exceed the limits shown in table 5 for the power level measured in step b), except where one or more of the micro or pico-BTS exceptions and minimum measurement levels applies.

For each static power step, the ratio of the power measured in steps f) and g) of the test case to the power measured in step c) for the same static power step shall not exceed the limits specified in table 5a for GSM900, GSM 850 and MXM 850 and table 5b for DCS1800, PCS 1900 and MXM 1900 systems, except where one or more of the micro or pico-BTS exceptions and minimum measurement levels applies.

Table 5a: Continuous modulation spectrum – maximum limits for GSM900,
GSM 850 and MXM 850 Micro and Pico-BTS

Power Class

Maximum relative level (dB) at specified carrier offsets (kHz),

using specified measurement (filter)bandwidths (kHz):

1 800 to < 6 000

> 6 000

Measurement (filter) bandwidth; 100kHz

M1 to M3

-70

-70

P1

-70

-80

Table 5b: Continuous modulation spectrum – maximum limits for DCS1800, PCS 1900
and MXM 1900 Micro and Pico-BTS

Power Class

Maximum relative level (dB) at specified carrier offsets (kHz),

using specified measurement (filter)bandwidths (kHz):

1 800 to < 6 000

> 6 000

Measurement (filter) bandwidth; 100kHz

M1 to M3

-76

-76

DCS 1800 P1

-76

-80

PCS 1900 and MXM 1900
P1

-76

-76

The following exceptions and minimum measurement levels shall apply for the micro and pico‑BTS.

1) In the combined range 600 kHz to 6 MHz above and below the carrier frequency, in up to three bands of 200 kHz width centred on a frequency which is an integer multiple of 200 kHz, exceptions at up to ‑36 dBm are allowed.

2) Above 6 MHz offset from the carrier frequency, in up to 12 bands of 200 kHz width centred on a frequency which is an integer multiple of 200 kHz, exceptions at up to ‑36 dBm are allowed.

3) If the limit as specified above is below the values in table 6, then the values in table 6 shall be used instead.

Table 6: Continuous modulation spectrum ‑ minimum levels for micro and pico‑BTS

Power Class

Maximum spectrum due to modulation and noise in 100 kHz

GSM900, GSM 850 and MXM 850 (dBm)

DCS1800, PCS 1900 and MXM 1900 (dBm)

M1

‑59

‑57

M2

‑64

‑62

M3

‑69

‑67

P1

-68

-65

6.5.1.4 Complete conformance

Test Environment:

Normal.

Conformance requirement

The test shall be repeated until each TRX in the configuration has been tested. The essential conformance requirement shall be met for each TRX.

6.5.1.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.2.1.

6.5.2 Switching transients spectrum

6.5.2.1 Test purpose

To verify that the output RF spectrum due to switching transients does not exceed the specified limits.

6.5.2.2 Test case

The Manufacturer shall declare how many TRXs the BSS supports:

1 TRX: The TRX shall be tested at B, M and T.

2 TRX: One shall be configured to support the BCCH and the second TRX shall be activated and tested at B, M and T.

3 TRX: One shall be configured to support the BCCH and the other two shall be activated and tested. Tests shall be performed on B, M and T and both TRXs shall be tested on at least one frequency.

4 TRX or more: One shall be configured to support the BCCH and three TRXs shall be tested, one on B, one on M and one on T.

If the TRX supporting the BCCH is physically different from the remaining TRX(s), it shall also be tested on B, M and T.

a) All active time slots shall be GMSK or 8-PSK modulated with a pseudo‑random bit sequence apart from time slot 0 of the TRX supporting the BCCH which may be modulated with normal data. The power shall be measured at the offsets listed below from one of the carrier frequencies in the configuration with the test equipment parameters below. The reference power for relative measurements is the power measured in a bandwidth of at least 300 kHz for the TRX under test for the time slot in this test with the highest power.

Resolution bandwidth: 30 kHz

Video bandwidth: 100 kHz

Zero frequency scan

Peak hold enabled

The following offsets from the carrier frequency shall be used:

400, 600, 1200, and 1800 kHz.

b) All timeslots of the TRX or TRXs under test shall be activated at the highest level of static power control and the power measured as described in step a). If synthesizer SFH is supported, the test shall be repeated for the TRX or TRXs which are activated and which do not support the BCCH, with them hopping between B, M and T.

c) All timeslots of the TRX or TRXs under test shall be activated at the lowest level of static power control and the power measured as described in step a). If synthesizer SFH is supported, the test shall be repeated for the TRX or TRXs which are activated and which do not support the BCCH, with them hopping between B, M and T.

d) Any active TRX which does not support the BCCH shall be configured with alternate timeslots active at the highest level of static power control and the remaining timeslots idle as illustrated in figure 4 and the power measured as described in step a).

e) Any active TRX which does not support the BCCH shall be configured with alternate timeslots active at the lowest level of static power control and the remaining timeslots idle as illustrated in figure 4 and the power measured as described in step a).

f) If the BSS supports dynamic downlink power control, any active TRX which does not support the BCCH shall be configured with transitions between timeslots active at the highest level of static power control and timeslots active at the lowest available level of dynamic power control and idle timeslots, as illustrated in figure 3 and the power measured as described in step a).

NOTE: Pdmin = The lowest dynamic power step measured in subclause 6.3.

Figure 3: Power/time slot configuration (RF power control)

Figure 4: Power/time slot configuration (no RF power control)

6.5.2.3 Essential conformance

Test environment:

Normal.

Conformance requirement

The power measured shall not exceed the limits shown in table 7, or ‑36 dBm, whichever value is highest.

6.5.2.4 Complete conformance

Test environment:

Normal.

Conformance requirement

The test shall be repeated until all the TRXs specified to be tested have each been tested on the B, M and T.

The power measured shall not exceed the limits shown in table 7, or ‑36 dBm, whichever value is highest.

Table 7: Switching transients spectrum ‑ maximum limits

Offset (kHz):

Power (dBc): GSM 400, GSM900, GSM 850 and MXM 850

(GMSK)

Power (dBc): GSM 400, GSM900, GSM 850 and MXM 850

(8-PSK)

Power (dBc) DCS1800, PCS 1900 and MXM 1900

(GMSK)

Power (dBc) DCS1800, PCS 1900 and MXM 1900

(8-PSK)

400

‑57

‑52

‑50

‑50

600

‑67

‑62

‑58

‑58

1200

‑74

‑74

‑66

‑66

1800

‑74

‑74

‑66

‑66

6.5.2.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.2.2.

6.6 Spurious emissions from the transmitter antenna connector

The test conditions for conducted emissions are defined separately for the BSS relevant transmit band, and elsewhere.

6.6.1 Conducted spurious emissions from the transmitter antenna connector, inside the BTS transmit band

6.6.1.1 Test Purpose

This test measures spurious emissions from the BSS transmitter antenna connector inside the BSS relevant transmit band, while one transmitter is in operation.

6.6.1.2 Test Case

The BTS shall be configured with one TRX active at its maximum output power on all time slots. The test shall be performed at RF channels B, M and T. Slow frequency hopping shall be disabled.

NOTE: It may be necessary to take steps to ensure that emissions from other transmitters which are not active do not influence the results. This may be achieved by, for example, equipping the BTS with only one TRX or by muting the outputs of the transmitters to a greater degree than otherwise required in GSM 05.05 (ETS 300 577 [7] or ETS 300 910 [22]).

The transmitter antenna connector shall be connected to a spectrum analyser or selective voltmeter with the same characteristic impedance. Peak hold shall be enabled. The power shall be measured.

For frequencies with an offset of 1.8 MHz  f < 6 MHz from the carrier frequency, and which fall within the relevant TX band:

– The detecting device shall be configured with a resolution bandwidth of 30 kHz and a video bandwidth of approximately three times this value.

For frequencies with an offset of  6 MHz from the carrier frequency, and which fall within the relevant TX band:

– The detecting device shall be configured with a resolution bandwidth of 100 kHz and a video bandwidth of approximately three times this value.

6.6.1.3 Essential conformance

Test Environment

Normal:

Conformance requirement

The maximum power measured shall not exceed ‑36 dBm.

6.6.1.4 Complete conformance

The requirement of essential conformance shall apply.

6.6.1.5 Requirement Reference

GSM 05.05 (ETS 300 577) [7] subclause 4.3, or GSM 05.05 (ETS 300 910) [22] subclause 4.3.

6.6.2 Conducted spurious emissions from the transmitter antenna connector, outside the BTS transmit band

6.6.2.1 Applicability (Phase 2)

This test is applicable to equipment meeting the requirements of ETS 300 577 [7] subclauses 4.3 and 4.7.2.

6.6.2.1.1 Test Purpose

This test measures spurious emissions from the BSS transmitter antenna connector outside the BSS relevant transmit band, while the transmitters are in operation. It also tests the intra‑BTS intermodulation requirements outside the BTS transmit and receive bands.

6.6.2.1.2 Test Case

a) The BSS shall be configured with all transmitters active at their maximum output power on all time slots. If a TRX is designated as being a dedicated BCCH, it shall be allocated to RF channel M. All remaining TRXs shall be allocated in the following order; first to RF channel B, then to T, then distributed as evenly as possible throughout the BSS transmit operating band. Slow frequency hopping shall be disabled.

b) The transmitter antenna connector shall be connected to a spectrum analyser or selective voltmeter with the same characteristic impedance.

The detecting device shall be configured with a resolution and video bandwidth of 100 kHz. The minimum sweep time shall be at least 75 ms and the response shall be averaged over 200 sweeps.

The power shall be measured over the BSS receive operating band.

c) Step b) shall be repeated for the following frequency band:

‑ for a GSM 900 BSS, the band 1 805 MHz to 1 880 MHz.

‑ for a DCS1800 BSS, the band 925 MHz to 960 MHz.

d) If the manufacturer declares that the BSS is suitable for the co-siting of GSM900 and DCS1800 BSSs the following test shall be performed:

Step b) shall be repeated for the following frequency band:

‑ for a GSM900 BSS, the band 1710 MHz to 1785 MHz.

‑ for a DCS1800 BSS, the band 880 MHz to 915 MHz.

e) The BSS shall be configured as in step a) except that each TRX which is not a dedicated BCCH shall transmit on full power on alternate time slots. The active timeslots should be the same for all TRXs. Either odd or even timeslots may be tested. If slow frequency hopping is supported, each TRX which is not a dedicated BCCH shall hop over the full range of frequencies defined in step a).

The detecting device shall be configured as defined in table 8a. Peak hold shall be enabled, and the video bandwidth shall be approximately three times the resolution bandwidth. If this video bandwidth is not available on the detecting device, it shall be the maximum available, and at least 1 MHz.

The power shall be measured over those parts of the frequency range 100 kHz to 12.75 GHz which are outside the BTS relevant transmit band.

Table 8a: Spurious Emissions Measurements outside the transmit band

Frequency Band

Frequency offset

Resolution Bandwidth

100 kHz ‑ 50 MHz

10 kHz

50 MHz ‑ 500 MHz

100 kHz

500 MHz – 12,75 GHz and outside the relevant transmit band

(offset from the edge of the relevant transmit band)

 2 MHz

30 kHz

 5 MHz

100 kHz

 10 MHz

300 kHz

 20 MHz

1 MHz

 30 MHz

3 MHz

6.6.2.1.3 Essential conformance

Test Environment

Normal:

Conformance requirement

i) The maximum power measured at step c) shall not exceed ‑47 dBm for a GSM 900 BTS or ‑57 dBm for a DCS 1800 BTS

ii) The maximum power measured at step e) shall not exceed:

– ‑36 dBm for frequencies up to 1 GHz;

– ‑30 dBm for frequencies above 1 GHz.

6.6.2.1.4 Complete conformance

Test Environment

Normal:

Conformance requirement

1) The maximum power measured at step b) shall not exceed the requirements in table 8b:

Table 8b: Requirements for transmitter spurious emissions in receiver bands

GSM BSS receive band (dBm)

DCS 1800 BSS receive band (dBm)

Normal BTS

‑98

‑98

Micro BTS M1

‑91

‑96

Micro BTS M2

‑86

‑91

Micro BTS M3

‑81

‑86

2) The maximum power measured at step c) shall not exceed ‑47 dBm for a GSM 900 BSS or ‑57 dBm for a DCS 1800 BSS;

3) The maximum power measured at step e) shall not exceed:

– ‑36 dBm for frequencies up to 1 GHz;

– ‑30 dBm for frequencies above 1 GHz.

4) If the manufacturer declares that the BSS is suitable for co‑siting of GSM 900 and DCS 1800 BSSs, the power measured in step d) shall not exceed the requirements in table 9.

6.6.2.1.5 Requirement Reference

GSM 05.05 (ETS 300 577) [7] subclauses 4.3 and 4.7.2

6.6.2.2 Applicability (Phase 2+)

This test is applicable to equipment meeting the requirements of EN 300 910 [22] subclauses 4.3 and 4.7.2.

6.6.2.2.1 Test Purpose

This test measures spurious emissions from the BSS transmitter antenna connector outside the BSS relevant transmit band, while the transmitters are in operation. It also tests the intra‑BTS intermodulation requirements for GSM 400, GSM 850, GSM 900, DCS 1800 and PCS 1900 outside the BTS transmit and receive bands.

6.6.2.2.2 Test Case

a) The BSS shall be configured with all transmitters active at their maximum output power on all time slots. If a TRX is designated as being a dedicated BCCH, it shall be allocated to RF channel M. All remaining TRXs shall be allocated in the following order; first to RF channel B, then to T, then distributed as evenly as possible throughout the BSS operating transmit band. Slow frequency hopping shall be disabled.

b) The transmitter antenna connector shall be connected to a spectrum analyser or selective voltmeter with the same characteristic impedance.

The detecting device shall be configured with a resolution and video bandwidth of 100 kHz. The minimum sweep time shall be at least 75 ms and the response shall be averaged over 200 sweeps.

The power shall be measured over the BSS operating receive band.

c) Step b) shall be repeated for the following frequency band:

‑ for a GSM 900 or GSM 400 BSS, the band 1 805 MHz to 1 880 MHz.

‑ for a DCS1800 or GSM 400 BSS, the band 921 MHz to 960 MHz.

‑ for a GSM 850 or MXM 850 BSS, the band 1 930 MHz to 1 990 MHz.

‑ for a PCS 1900 or MXM 1900 BSS, the band 869 MHz to 894 MHz.

d) If the manufacturer declares that the BSS is suitable for the co-siting of GSM 400, GSM900 and DCS1800 BSSs or co-siting of MXM 850 and MXM 1900 BSS or co-siting of GSM 850 and PCS 1900 BSS the following test shall be performed:

Step b) shall be repeated for the following frequency band:

‑ for a GSM900 or GSM 400 BSS, the band 1 710 MHz to 1 785 MHz.

  • for a DCS1800 or GSM 400 BSS, the band 876 MHz to 915 MHz.

– for a GSM 900 or DCS 1800 BSS suitable for co-siting with a GSM 400 BSS, the bands 450,4 – 457,6 MHz and 478,8 – 486,0 MHz.

‑ for a GSM 850 or MXM 850 BSS, the band 1 850 MHz to 1 910 MHz.

‑ for a PCS 1900 or MXM 1900 BSS, the band 824 MHz to 849 MHz.

e) The BSS shall be configured as in step a) except that each TRX which is not a dedicated BCCH shall transmit on full power on alternate time slots. The active timeslots should be the same for all TRXs. Either odd or even timeslots may be tested. If slow frequency hopping is supported, each TRX which is not a dedicated BCCH shall hop over the full range of frequencies defined in step a).

The detecting device shall be configured as defined in table 9a. Peak hold shall be enabled, and the video bandwidth shall be approximately three times the resolution bandwidth. If this video bandwidth is not available on the detecting device, it shall be the maximum available, and at least 1 MHz.

The power shall be measured over those parts of the frequency range 100 kHz to 12.75 GHz which are outside the BTS relevant transmit band.

f) If the manufacturer declares that the BSS protects co-coverage GSM 400 systems the following test shall be performed:

Step b) shall be repeated for the following frequency band:

‑ for a GSM900 or DCS 1800 BSS, the bands 460,4 – 467,6 MHz and 488,8 – 496,0 MHz.

Table 9a: Spurious Emissions Measurements outside the transmit band

Frequency Band

Frequency offset

Resolution Bandwidth

100 kHz ‑ 50 MHz

10 kHz

50 MHz ‑ 500 MHz and outside the

relevant transmit band

(offset from the edge of the relevant transmit band)

 2 MHz

30 kHz

 5 MHz

100 kHz

500 MHz ‑ 12,75 GHz and outside the relevant transmit band

(offset from the edge of the relevant transmit band)

 2 MHz

30 kHz

 5 MHz

100 kHz

 10 MHz

300 kHz

 20 MHz

1 MHz

 30 MHz

3 MHz

6.6.2.2.3 Essential conformance

Test Environment

Normal:

Conformance requirement

i) The maximum power measured at step c) shall not exceed:

‑47 dBm for a GSM 900, GSM 850 or MXM 850 BTS;

‑57 dBm for a DCS 1800, PCS 1900 or MXM 1900 BTS;

‑47 dBm for a GSM 400 BTS in the band 1 805 MHz to 1 880 MHz;

‑57 dBm for a GSM 400 BTS in the band 925 MHz to 960 MHz.

ii) The maximum power measured at step e) or f) shall not exceed:

‑36 dBm for frequencies up to 1 GHz;

‑30 dBm for frequencies above 1 GHz.

6.6.2.2.4 Complete conformance

Test Environment

Normal:

Conformance requirement

1) The maximum power measured at step b) shall not exceed the requirements in table 9b:

Table 9b: Requirements for transmitter spurious emissions in receiver bands

GSM 400, GSM 900, GSM 850 and MXM 850 BSS receive band (dBm)

DCS 1800, PCS 1900 and MXM 1900 BSS receive band (dBm)

Normal BTS

‑98

‑98

Micro BTS M1

‑91

‑96

Micro BTS M2

‑86

‑91

Micro BTS M3

‑81

‑86

Pico-BTS P1

-70

-80

R-GSM 900 BTS

‑89

NOTE: Micro and pico-BTS is not defined for GSM400.

2) The maximum power measured at step c) shall not exceed:

‑47 dBm for a GSM 900, GSM 850 or MXM 850 BSS;

‑57 dBm for a DCS 1800, PCS 1900 or MXM 1900 BSS;

‑47 dBm for a GSM 400 BTS in the band 1 805 MHz to 1 880 MHz;

‑57 dBm for a GSM 400 BTS in the band 925 MHz to 960 MHz.

3) The maximum power measured at step e) shall not exceed:

‑36 dBm for frequencies up to 1 GHz

‑30 dBm for frequencies above 1 GHz

4) If the manufacturer declares that the BSS is suitable for co‑siting of GSM 400, GSM 900 and DCS 1800 BSSs, the power measured in step d) shall not exceed the requirements in table 9b.

  1. If the manufacturer declares that the BSS is suitable for co‑siting of MXM 850 and MXM 1900 BSSs or co‑siting of GSM 850 and PCS 1900 BSSs, the power measured in step d) shall not exceed the requirements in table 9b.

6) If the manufacturer declares that the BSS protects co-coverage GSM 400 systems the maximum power measured at step f) shall not exceed:

‑57 dBm for a GSM 900, or DCS 1800 BSS

6.6.2.2.5 Requirement Reference

GSM 05.05 (EN 300 910) [22] subclauses 4.3, 4.7.2

6.6.2.3 Applicability (Phase 2+ Release 1999 GSM 400, GSM 900 and DCS 1800)

If this test is applicable subclause 6.6.2.2 is also applicable.

This test is applicable to GSM 400, GSM 900 and DCS 1800 equipment supporting any of the release 1999 features GSM 400 or 8-PSK modulation with the following exceptions:

  • If a BTS is built to a specification for Release 98 or earlier and is upgraded to Release 99 or later, by exchange to or addition of transceivers supporting 8-PSK, any transmitters not supporting 8-PSK shall be excluded in step a in subclause 6.6.2.3.2.
6.6.2.3.1 Test Purpose

This test measures spurious emissions from the BSS transmitter antenna connector in the UTRA UE and BS receive bands, while the transmitters are in operation.

6.6.2.3.2 Test Case

a) The BSS shall be configured with all transmitters, not excluded according to subclause 6.6.2.3, active at their maximum output power on all time slots. If a TRX is designated as being a dedicated BCCH, it shall be allocated to RF channel M. All remaining TRXs shall be allocated in the following order; first to RF channel B, then to T, then distributed as evenly as possible throughout the BSS operating transmit band. Slow frequency hopping shall be disabled.

b) The transmitter antenna connector shall be connected to a spectrum analyser or selective voltmeter with the same characteristic impedance.

The detecting device shall be configured with a resolution and video bandwidth of 100 kHz. The minimum sweep time shall be at least 75 ms and the response shall be averaged over 200 sweeps.

The power shall be measured for the following frequency band:

– the band 1900 ‑ 1920 MHz.

– the band 1920 ‑ 1980 MHz.

– the band 2010 ‑ 2025 MHz.

  • the band 2110 ‑ 2170 MHz.

c) The BSS shall be configured with all transmitters active at their maximum output power on all time slots. If a TRX is designated as being a dedicated BCCH, it shall be allocated to RF channel M. All remaining TRXs shall be allocated in the following order; first to RF channel B, then to T, then distributed as evenly as possible throughout the BSS operating transmit band. Slow frequency hopping shall be disabled.

d) If the manufacturer declares that the BSS is suitable for the co-siting with UTRA BTS the following test shall be performed (with configuration according to step c) :

The transmitter antenna connector shall be connected to a spectrum analyser or selective voltmeter with the same characteristic impedance.

The detecting device shall be configured with a resolution and video bandwidth of 100 kHz. The minimum sweep time shall be at least 75 ms and the response shall be averaged over 200 sweeps.

The power shall be measured for the following frequency band:

  • the band 1900 ‑ 1920 MHz and 2010 – 2025 MHz for a BTS intended for co-siting with a UTRA/TDD BS.
  • the band 1920 ‑ 1980 MHz for a BTS intended for co-siting with a UTRA/FDD BS.
6.6.2.3.3 Essential conformance

Test Environment

Normal:

Conformance requirement

The maximum power measured at step b) shall not exceed ‑62 dBm.

6.6.2.3.4 Complete conformance

Test Environment

Normal:

Conformance requirement

  1. The maximum power measured at step b) shall not exceed ‑62 dBm.
  2. If the manufacturer declares that the BSS is suitable for co‑siting with one or more types of UTRA BTS, the power measured in step d) shall not exceed –96 dBm.
6.6.2.3.5 Requirement Reference

GSM 05.05 (EN 300 910) [22] subclauses 4.3.2

6.7 Intermodulation attenuation (GSM 400, GSM 900 and DCS 1800)

6.7.1 Test purpose

To verify that the RF transmit equipment is able to restrict the generation of signals in its non‑linear elements caused by the presence of the RF output from the transmitter and an interfering signal reaching the transmitter via its antenna to below specified levels.

6.7.2 Test case

If SFH is supported by the BSS, it shall be disabled during this measurement.

The Manufacturer shall declare how many TRXs the BSS supports. The BSS shall be configured with the maximum number of TRXs supported. The test shall be performed for the number of TRXs and the frequencies defined in the conformance requirement.

Only the TRX under test shall be active. All remaining TRXs shall be idle on an ARFCN within the transmit operating band for the BSS.

NOTE 1: It is particularly important, for a BSS which uses a tuned transmitter combiner, that all sections of the combiner are set to frequencies within the transmit operating band of the BSS during this test.

The antenna output of the RF transmit equipment under test, including the combiner, shall be connected to a coupling device, presenting to the RF equipment a load with an impedance of 50 ohms. The frequency of the test signal shall be within the transmit operating band (see subclause 4.2). The test signal shall be unmodulated and the frequency shall be X MHz offset from the frequency of the RF transmit equipment under test. The TRX under test shall be set to highest static power control level and the test signal power level shall be adjusted 30 dB below this value. The test signals are illustrated in figure 5. The power level of the test signal shall be measured at the antenna output end of the coaxial cable, when disconnected from the RF transmit equipment and then correctly matched into 50 ohms. The antenna output power of the RF transmit equipment shall be measured directly at the antenna output terminal connected to an artificial antenna. Intermodulation product frequencies in the relevant TX band and relevant RX band shall be identified and measured according to the following process.

For the measurements in the relevant RX band:

Use a measurement and filter bandwidth of 100 kHz, frequency scan mode, averaged over 200 sweeps, with a sweep time of at least 75 ms. The frequency offset X shall be chosen to cause the lowest order intermodulation product to fall in the operating RX band.

For measurements in the relevant TX band:

The measurement shall be made for frequency offsets X of: 0.8 MHz, 2.0 MHz, 3.2 MHz, 6.2 MHz. The power of all third and fifth order intermodulation products shall be measured. The method of measurement specified below depends on the frequency offset of the intermodulation product from the carrier frequency:

For measurements at frequency offsets from the active TRX of more than 6 MHz the peak power of any intermodulation components shall be measured with a bandwidth of 300 kHz, zero frequency span, over a time slot period. This shall be measured over sufficient time slots to ensure conformance according to methodology of annex A. The reference power for relative measurements is the power measured in a bandwidth of at least 300 kHz for the TRX under test.

For measurements at frequency offsets from the active TRX 1.8 MHz or less the intermodulation product power shall be measured selectively using video averaging over 50 to 90 % of the useful part of the time slot excluding the mid‑amble. The averaging shall be over at least 200 time slots and only active bursts shall be included in the averaging process. The RF and video filter bandwidth of the measuring instrument shall be 30 kHz.

For measurements at frequency offsets in the range 1.8 to 6 MHz the intermodulation product power shall be measured in a frequency scan mode, with a minimum sweep time of 75 ms and averaged over 200 sweeps. The RF and video filter bandwidth of the measuring instrument shall be 100 kHz.

NOTE 2: When the above measurements are performed precautions should be taken, so that non‑linearity in the selective measuring device does not influence the results appreciably. Furthermore it should be ensured that intermodulation components which may be generated by non‑linear elements in the test equipment (e.g. signal generator, coupling device, selective measuring device) are sufficiently reduced. The RF transmit equipment under test and the test signal source should be physically separated in such a way that the measurement is not influenced by direct radiation. A possible measurement set‑up is shown in annex B.2.

6.7.3 Essential Conformance

Test Environment

Normal:

The following tests shall be performed, depending on the number of TRXs supported by the BSS:

1 TRX: The TRX shall be tested at B, M, and T.

2 TRX: One test shall be performed on B, M, and T. Each TRX shall be tested at least once.

3 or more TRX: One TRX shall be tested at B, one at M and one at T.

Conformance requirement

At frequencies offset from the wanted signal carrier frequency by more than 6 MHz and up to the edge of the relevant transmit band, the intermodulation components measured shall not exceed ‑70 dBc or ‑36 dBm, whichever is the higher. 1 in 100 time slot periods may fail the requirement by up to 10 dB.

At frequencies offset from the wanted signal carrier frequency of less than 6 MHz, the requirements are that specified in 6.5.1.3, Continuous Modulation Spectrum. The exceptions given in subclause 6.5.1.3 also apply.

6.7.4 Complete conformance

Test Environment

Normal:

Figure 5: Example of TX intermodulation attenuation

Conformance requirement

The test shall be performed until three TRXs, or the maximum number supported by the BSS (whichever is the less) have each been tested at B, M, and T.

In the operating receive band the measured intermodulation components shall never exceed the values given in table 10 under normal test conditions.

Table 10: Maximum Receive Band transmitter intermodulation limits

GSM 400, GSM 900 (dBm)

DCS 1800

(dBm)

Normal BTS

‑98

‑98

Micro‑BTS M1

‑91

‑96

Micro‑BTS M2

‑86

‑91

Micro‑BTS M3

‑81

‑86

Pico‑BTS P1

‑70

‑80

R‑GSM 900 BTS

‑89

n/a

NOTE: Micro and pico-BTS is not defined for GSM400.

At frequencies offset from the wanted signal carrier frequency by more than 6 MHz and up to the edge of the relevant transmit band, the intermodulation components measured shall not exceed ‑70 dBc or ‑36 dBm, whichever is the higher. 1 in 100 time slot periods may fail the requirement by up to 10 dB.

At frequencies offset from the wanted signal carrier frequency by less than 6 MHz, the requirements are that specified in subclause 6.5.1.3, Continuous Modulation Spectrum. The exceptions given in subclause 6.5.1.3 also apply.

6.7.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.7.1

6.8 Intra Base Station System intermodulation attenuation

6.8.1 Test purpose

To verify that the level of intermodulation products produced inside the RX and TX bands (due to the leakage of RF power between transmitters that are operating in close vicinity of each other inside the BSS, or are combined to feed a single antenna) do not exceed the specified limit. The test is not applicable for GSM 850, MXM 850, PCS 1900 and MXM 1900.

6.8.2 Test case

If SFH is supported by the BSS, it shall be disabled during this measurement.

The BSS shall be configured with a full compliment of transceivers. Each RF transmit equipment shall be operated at the maximum power specified (Highest Static Power Control Level subclause 6.3) and with modulation of a pseudo random sequence applied.

In the relevant transmit band, the intermodulation components shall be measured at frequency offsets above the uppermost and below the lowermost carrier frequencies.

All intermodulation product frequencies in the relevant TX band and operating RX band shall be identified and measured according to the process below.

For the measurement in the operating RX band

The equipment shall be operated with ARFCNs such that the lowest order intermodulation product falls into the operating receive band. The measurement shall be carried out at the antenna connector of the BSS, using a frequency selective instrument.

A possible measurement set‑up for this test is shown in annex B.2.

For measurements in the RX band the following is the test set up:

A filter and video bandwidth of 100 kHz.

Frequency scan mode.

Minimum sweep time of 75 ms and averaged over 200 sweeps.

For measurements in the relevant TX band

The equipment shall be operated at equal and minimum frequency spacing specified for the BSS configuration under test.

For frequency offsets of more than 6 MHz the peak power of any intermodulation components shall be measured with a bandwidth of 300 kHz, zero frequency span, over a time slot period. This shall be measured over sufficient time slots to ensure conformance according to methodology of annex A.1. The reference power for relative measurements is the power measured in a bandwidth of at least 300 kHz for the TRX under test.

For frequency offsets 1.8 MHz or less the intermodulation product power shall be measured selectively using video averaging over 50 to 90 % of the useful part of the time slot excluding the mid‑amble. The averaging shall be over at least 200 time slots and only active bursts shall be included in the averaging process. The RF and video filter bandwidth of the measuring instrument shall be 30 kHz.

For frequency offsets in the range 1.8 to 6 MHz the intermodulation product power shall be measured in a frequency scan mode, with a minimum sweep time of 75 ms and averaged over 200 sweeps. The RF and video filter bandwidth of the measuring instrument shall be 100 kHz.

6.8.3 Essential conformance

Test Environment

Normal:

Conformance requirement

In the relevant transmit band, at offsets greater than 0.6 MHz and up to 6 MHz, the requirements are that specified in subclause 6.5.1, Continuous Modulation Spectrum. The exceptions given there shall also apply.

At frequencies offset from the wanted signal carrier frequency by more than 6 MHz and up to the edge of the relevant transmit band, the intermodulation components measured shall not exceed ‑70 dBc or ‑36 dBm, whichever is the higher. 1 in 100 time slot periods may fail the requirement by up to 10 dB.

6.8.4 Complete conformance

Test Environment

Normal:

Conformance requirement

In the operating receive band the measured intermodulation components shall never exceed the values given in table 11 under normal test conditions.

Table 11: Maximum intra‑BSS Receive Band transmitter intermodulation limits

GSM 400, GSM 850 and GSM 900 (dBm)

DCS 1800 and PCS 1900 (dBm)

Normal BTS

‑98

‑98

Micro‑BTS M1

‑91

‑96

Micro‑BTS M2

‑86

‑91

Micro‑BTS M3

‑81

‑86

Pico‑BTS P1

‑70

‑80

R‑GSM 900 BTS

‑89

n/a

NOTE: Micro and pico-BTS is not defined for GSM400.

In the relevant transmit band, at offsets greater than 0.6 MHz and up to 6 MHz, the requirements are that specified in subclause 6.5.1, Continuous Modulation Spectrum. The exceptions given there shall also apply.

At frequencies offset from the wanted signal carrier frequency by more than 6 MHz and up to the edge of the relevant transmit band, the intermodulation components measured shall not exceed ‑70 dBc or ‑36 dBm, whichever is the higher. 1 in 100 time slot periods may fail the requirement by up to 10 dB.

6.8.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.7.2.

6.9 Intra Base Station System intermodulation attenuation, MXM 850 and MXM 1900

6.9.1 Test purpose

To verify that the level of intermodulation products (due to the leakage of RF power between transmitters that are operating in close vicinity of each other inside the BSS, or are combined to feed a single antenna) do not exceed the specified limit.

6.9.2 Test cases

6.9.2.1 200 kHz carriers-only

If SFH is supported by the BSS, it shall be disabled during this measurement.

The BSS shall be configured with a full complement of transceivers. Each RF transmit equipment shall be operated at the maximum power specified (Highest Static Power Control Level, subclause 6.3) and with modulation of a pseudo random sequence applied.

The equipment shall be operated at equal and minimum frequency spacing specified for the BSS configuration under test.

For frequency offsets above the uppermost and below the lowermost carrier frequencies of more than 1.2 MHz and within the relevant TX band the average power of any intermodulation components shall be measured with a bandwidth of 200 kHz, zero frequency span, over a time slot period. The reference power for relative measurements is the average power measured in a bandwidth of 300 kHz for the TRX under test.

6.9.2.2 200 kHz and ANSI-136 30 kHz carriers

A BSS comprised of both ANSI-136 30 kHz carriers (see TIA-EIA-136-C [25]) and 200 kHz carriers, shall be configured with a full complement of transceivers. Each RF transmit equipment shall be operated at the maximum power specified (Static Level 0 subclause 6.3 or, in the case of 30 kHz channels, as specified in TIA-EIA-136-C [25] part 280) and with modulation of a pseudo random sequence applied.

The equipment shall be operated at equal and minimum frequency spacing specified for each carrier type operating in the BSS configuration under test.

For frequency offsets above the uppermost and below the lowermost carrier frequencies, of more than 1.2 MHz and within the relevant TX band, the average power of any intermodulation components shall be measured as follows.

Two measurement types shall be made:

(a) For each 30 kHz carrier, measure the reference average power, in a 30 kHz bandwidth and in accordance with TIA/EIA-136 part 280, section 3.4.4 [25]. Then, for all intermodulation products, measure, in a 30 kHz bandwidth and in average power mode, the power relative to the carrier reference power.

(b) For each 200 kHz carrier, measure the reference average power, in a 300 kHz bandwidth and averaged over a time slot period in zero frequency span. Then, for all intermodulation products, measure, in a 200 kHz bandwidth and in average power mode, the power relative to the carrier reference power.

6.9.3 Essential conformance

This test need not be performed.

6.9.4 Complete conformance

Test Environment

Normal:

Conformance requirement

The average value of the measured intermodulation products shall not exceed:

(a) -60 dBc, relative to the 30 kHz carrier average power and

(b) -60 dBc, relative to the 200 kHz carrier average power.

6.9.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.7.2.

6.10 Intra Base Station System intermodulation attenuation,
PCS 1900 and GSM 850

6.10.1 Test purpose

To verify that the level of intermodulation products produced inside the RX and TX bands (due to the leakage of RF power between transmitters that are operating in close vicinity of each other inside the BSS, or are combined to feed a single antenna) do not exceed the specified limit.

6.10.2 Test case

If SFH is supported by the BSS, it shall be disabled during this measurement.

The BSS shall be configured with a full compliment of transceivers. Each RF transmit equipment shall be operated at the maximum power specified (Highest Static Power Control Level subclause 6.3) and with modulation of a pseudo random sequence applied.

All intermodulation product frequencies in the relevant TX band and operating RX band shall be identified and measured according to the process below.

For measurements in the relevant TX band

The equipment shall be operated at equal and minimum frequency spacing specified for the BSS configuration under test.

For frequency offsets 0.6 to 1.8 MHz the intermodulation product power shall be measured selectively using video averaging over 50 to 90 % of the useful part of the time slot excluding the mid‑amble. The averaging shall be over at least 200 time slots and only active bursts shall be included in the averaging process. The RF and video filter bandwidth of the measuring instrument shall be 30 kHz.

For frequency offsets above the uppermost and below the lowermost carrier frequencies of more than 1.8 MHz the average power of any intermodulation components shall be measured with a bandwidth of 300 kHz, zero frequency span, over a time slot period. . The reference power for relative measurements is the power measured in a bandwidth of at least 300 kHz for the TRX under test In the operating RX band the power of any intermodulation components shall be measured with a filter and video bandwidth of 100 kHz, frequency scan mode, minimum sweep time of 75 ms and averaged over 200 sweeps.

For the measurement in the operating RX band

The equipment shall be operated with ARFCNs such that the lowest order intermodulation product falls into the operating receive band. The measurement shall be carried out at the antenna connector of the BSS, using a frequency selective instrument.

A possible measurement set‑up for this test is shown in annex B.2.

For measurements in the RX band the following is the test set up:

A filter and video bandwidth of 100 kHz.

Frequency scan mode.

Minimum sweep time of 75 ms and averaged over 200 sweeps.

6.10.3 Essential conformance

This test need not be performed.

6.10.4 Complete conformance

Test Environment

Normal:

Conformance requirement

In the operating receive band the measured intermodulation components shall never exceed the values given in table 11 under normal test conditions.

In the relevant transmit band, at offsets greater than 0.6 MHz and up to 1.8 MHz, the requirements are that specified in subclause 6.5.1, Continuous Modulation Spectrum except that for offset 1.2 MHz to 1.8 MHz the measured power shall not exceed –70 dBc. The exceptions given there shall also apply.

In the relevant transmit band for offsets greater than 1.8 MHz the measured power shall not exceed –70 dBc relative to the per carrier power or –46 dBm whichever is the higher.

6.10.5 Requirement reference

GSM 05.05 (EN 300 910) [22] subclause 4.7.2

6.11 Intermodulation attenuation (GSM 850, MXM 850, PCS 1900 and MXM 1900)

6.11.1 Test purpose

To verify that the RF transmit equipment is able to restrict the generation of signals in its non‑linear elements caused by the presence of the RF output from the transmitter and an interfering signal reaching the transmitter via its antenna to below specified levels.

6.11.2 Test case

If SFH is supported by the BSS, it shall be disabled during this measurement.

The Manufacturer shall declare how many TRXs the BSS supports. The BSS shall be configured with the maximum number of TRXs supported. The test shall be performed for the number of TRXs and the frequencies defined in the conformance requirement.

Only the TRX under test shall be active. All remaining TRXs shall be idle on an ARFCN within the transmit operating band for the BSS.

NOTE 1: It is particularly important, for a BSS which uses a tuned transmitter combiner, that all sections of the combiner are set to frequencies within the transmit operating band of the BSS during this test.

The antenna output of the RF transmit equipment under test, including the combiner, shall be connected to a coupling device, presenting to the RF equipment a load with an impedance of 50 ohms. The frequency of the test signal shall be within the transmit operating band (see subclause 4.2). The test signal shall be unmodulated and the frequency shall be X MHz offset from the frequency of the RF transmit equipment under test. The TRX under test shall be set to highest static power control level and the test signal power level shall be adjusted 30 dB below this value. The test signals are illustrated in figure 5. The power level of the test signal shall be measured at the antenna output end of the coaxial cable, when disconnected from the RF transmit equipment and then correctly matched into 50 ohms. The antenna output power of the RF transmit equipment shall be measured directly at the antenna output terminal connected to an artificial antenna. Intermodulation product frequencies in the relevant TX band and relevant RX band shall be identified and measured according to the following process.

For the measurements in the relevant RX band:

Use a measurement and filter bandwidth of 100 kHz, frequency scan mode, averaged over 200 sweeps, with a sweep time of at least 75 ms. The frequency offset X shall be chosen to cause the lowest order intermodulation product to fall in the operating RX band.

For measurements in the relevant TX band:

The measurement shall be made for frequency offsets X of: 0.8 MHz, 2.0 MHz, 3.2 MHz, 6.2 MHz. The power of all third and fifth order intermodulation products shall be measured. The method of measurement specified below depends on the frequency offset of the intermodulation product from the carrier frequency:

For measurements at frequency offsets from the active TRX 1.8 MHz or less the intermodulation product power shall be measured selectively using video averaging over 50 to 90 % of the useful part of the time slot excluding the mid‑amble. The averaging shall be over at least 200 time slots and only active bursts shall be included in the averaging process. The RF and video filter bandwidth of the measuring instrument shall be 30 kHz.

For measurements at frequency offsets from the active TRX more than 1.8 MHz the average power of any intermodulation components shall be measured with a bandwidth of 300 kHz, zero frequency span, over a time slot period. . The reference power for relative measurements is the power measured in a bandwidth of at least 300 kHz for the TRX under test. In the operating RX band the power of any intermodulation components shall be measured with a filter and video bandwidth of 100 kHz, frequency scan mode, minimum sweep time of 75 ms and averaged over 200 sweeps.

6.11.3 Essential Conformance

Test Environment

Normal:

The following tests shall be performed, depending on the number of TRXs supported by the BSS:

1 TRX: The TRX shall be tested at B, M, and T.

2 TRX: One test shall be performed on B, M, and T. Each TRX shall be tested at least once.

3 or more TRX: One TRX shall be tested at B, one at M and one at T.

Conformance requirement

In the relevant transmit band for offsets greater than 1.8 MHz the measured power shall not exceed –70 dBc relative to the per carrier power or –46 dBm whichever is the higher.

In the relevant transmit band, at offsets greater than 0.6 MHz and up to 1.8 MHz, the requirements are that specified in subclause 6.5.1.3, Continuous Modulation Spectrum except that for offset 1.2 MHz to 1.8 MHz the measured power shall not exceed the requirements specified in subclause 6.5.1 or –70 dBc whichever higher. The exceptions in subclause 6.5.1.3 shall also apply.

6.11.4 Complete conformance

Figure 5a: Example of TX intermodulation attenuation

Test Environment

Normal:

Conformance requirement

The test shall be performed until three TRXs, or the maximum number supported by the BSS (whichever is the less) have each been tested at B, M, and T.

In the operating receive band the measured intermodulation components shall never exceed the values given in table 11a under normal test conditions.

Table 11a: Maximum Receive Band transmitter intermodulation limits

GSM 850 and MXM 850 (dBm)

PCS 1900 and MXM 1900 (dBm)

Normal BTS

‑98

‑98

Micro‑BTS M1

‑91

‑96

Micro‑BTS M2

‑86

‑91

Micro‑BTS M3

‑81

‑86

Pico‑BTS P1

‑70

‑80

In the relevant transmit band, at offsets greater than 0.6 MHz and up to 1.8 MHz, the requirements are that specified in subclause 6.5.1.3, Continuous Modulation Spectrum except that for offset 1.2 MHz to 1.8 MHz the measured power shall not exceed the requirements specified in subclause 6.5.1 or –70 dBc whichever higher. The exceptions in subclause 6.5.1.3 shall also apply.

In the relevant transmit band for offsets greater than 1.8 MHz the measured power shall not exceed –70 dBc relative to the per carrier power or –46 dBm whichever is the higher.

6.11.5 Requirement reference

3GPP TS 05.05 subclause 4.7.1.