11 Input Intermodulation

25.1533GPPRelease 17TSUTRA repeater conformance testing (LCR TDD)

The input intermodulation is a measure of the capability of the repeater to inhibit the generation of interference in the pass band, in the presence of interfering signals on frequencies other than the pass band.

11.1 Definition and applicability

Third and higher order mixing of the two interfering RF signals can produce an interfering signal in the band of the desired channel. Intermodulation response rejection is a measure of the capability of the Repeater to maintain the wanted frequency free of internally created interference.

This test applies to uplink and downlink path of the Repeater.

11.2 Minimum requirement

11.2.1 General requirement

For the parameters specified in table 11.1, the power in the pass band shall not increase with more than 10 dB at the output of the repeater as measured in the centre of the pass band, compared to the level obtained without interfering signals applied.

The frequency separation between the two interfering signals shall be adjusted so that the 3rd order intermodulation product is positioned in the centre of the pass band.

Table 11.1 specifies the parameters for two interfering signals, where:

– f1 offset is the offset from the channel edge frequency of the first or last channel in the pass band of the closer carrier.

Table 11.1: Input intermodulation requirement

f1 offset

Interfering Signal Levels

Type of signals

Measurement bandwidth

1,0 MHz

-40 dBm

2 CW carriers

1 MHz

11.2.2 Co-location with BS in other systems

This additional input intermodulation requirement may be applied for the protection of TDD Repeater input when GSM900, DCS1800, PCS1900, GSM850, UTRA FDD, UTRA TDD and/or E-UTRA BS are co-located with an LCR TDD Repeater.

Unless otherwise stated this requirement applies to the uplink and downlink of the repeater, at maximum gain.

For the parameters specified in table 11.2, the power in the pass band shall not increase with more than 10 dB at the output of the repeater as measured in the centre of the pass band, compared to the level obtained without interfering signals applied.

The frequency separation between the two interfering signals shall be adjusted so that the lowest order intermodulation product is positioned in the centre of the pass band.

NOTE 1: The lowest intermodulation products correspond to the 4th and 3rd order for the GSM 900 and DCS 1800 bands, respectively.

Table 11.2: Input intermodulation requirements for interfering signals in co-located other systems

Co-located other systems

Frequency of interfering signals

Interfering Signal Levels

Type of signals

Measurement bandwidth

Note

GSM900

921 ‑ 960 MHz

+16 dBm

2 CW carriers

1 MHz

DCS1800

1805 ‑ 1880 MHz

+16 dBm

2 CW carriers

1 MHz

PCS1900

1930 – 1990 MHz

+16 dBm

2 CW carriers

1 MHz

GSM850

869 – 894 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band I or
E-UTRA Band 1

2110 – 2170 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band II or
E-UTRA Band 2

1930 – 1990 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band III or
E-UTRA Band 3

1805 – 1880 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band IV or
E-UTRA Band 4

2110 – 2155 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band V or
E-UTRA Band 5

869 – 894 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band VI or
E-UTRA Band 6

875 – 885 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band VII or
E-UTRA Band 7

2620 – 2690 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band VIII or
E-UTRA Band 8

925 – 960 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band IX or
E-UTRA Band 9

1844.9 – 1879.9 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band X or
E-UTRA Band 10

2110 – 2170 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA-FDD Band XI or
E-UTRA Band 11

1475.9 – 1500.9 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA FDD Band XII or
E-UTRA Band 12

728 – 746 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA FDD Band XIII or
E-UTRA Band 13

746 – 756 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA FDD Band XIV or
E-UTRA Band 14

758 – 768 MHz

+16 dBm

2 CW carriers

1 MHz

UTRA TDD in Band a) or
E-UTRA Band 33

1900 – 1920 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band a), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band a) or
E-UTRA Band 34

2010 – 2025 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band a), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band b) or
E-UTRA Band 35

1850 – 1910 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band b), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band b) or
E-UTRA Band 36

1930 – 1990 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band b), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band c) or
E-UTRA Band 37

1910 – 1930 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band c), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band d) or
E-UTRA Band 38

2570 – 2620 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band d), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band e) or

E-UTRA Band 40

2300 – 2400 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band e), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

UTRA TDD in Band f) or

E-UTRA Band 39

1880 – 1920 MHz

+16 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band f), since it is already covered by the requirement in sub-clause 11.1, but requires a 86dB coupling loss between base station and the repeater DL receive port.

NOTE 1: The co-location requirements in Table 11.2 do not apply when the repeaters pass band frequency range is adjacent to the band for the co-location requirement in the Table 11.2. The current state-of-the-art technology does not allow a single generic solution for co-location with other system on adjacent frequencies for 30dB Repeater-BS minimum coupling loss. However, there are certain site-engineering solutions that can be used. These techniques are addressed in TR 25.942 [13].

NOTE 2: The Table 11.2 assumes that two operating bands, where the corresponding transmit and receive frequency ranges would be overlapping, are not deployed in the same geographical area. For such a case of operation with overlapping frequency arrangements in the same geographical area, special co-location requirements may apply that are not covered by the 3GPP specifications.

11.2.3 Co-existence with other systems

This additional input intermodulation requirement may be applied when GSM900, DCS1800, PCS1900, GSM850, UTRA FDD, UTRA TDD and/or E-UTRA BS operating in another frequency band co-exist with an E-UTRA FDD Repeater.

Unless otherwise stated this requirement applies to the uplink and downlink of the repeater, at maximum gain.

For the parameters specified in table 11.3, the power in the pass band shall not increase with more than 10 dB at the output of the repeater as measured in the centre of the pass band, compared to the level obtained without interfering signals applied.

The frequency separation between the two interfering signals shall be adjusted so that the lowest order intermodulation product is positioned in the centre of the pass band.

NOTE 1: The lowest intermodulation products correspond to the 4th and 3rd order for the GSM 900 and DCS 1800 bands, respectively.

Table 11.3: Input intermodulation requirements for interfering signals in co-existing other systems

Co-existence with other systems

Frequency of interfering signals

Interfering Signal Levels

Type of signals

Measurement bandwidth

Note

GSM900

876 – 915 MHz

-15 dBm

2 CW carriers

1 MHz

DCS1800

1710 ‑ 1785 MHz

-15 dBm

2 CW carriers

1 MHz

PCS1900

1850 ‑ 1910 MHz

-15 dBm

2 CW carriers

1 MHz

GSM850

824 ‑ 849 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band I or
E-UTRA Band 1

1920 – 1980 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band II or
E-UTRA Band 2

1850 – 1910 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band III or
E-UTRA Band 3

1710 – 1785 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band IV or
E-UTRA Band 4

1710 – 1755 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band V or
E-UTRA Band 5

824 – 849 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band VI or
E-UTRA Band 6

815 – 850 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band VII or
E-UTRA Band 7

2500 – 2570 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band VIII or
E-UTRA Band 8

880 – 915 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band IX or
E-UTRA Band 9

1749.9 – 1784.9 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band X or
E-UTRA Band 10

1710 – 1770 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band XI or
E-UTRA Band 11

1427.9 – 1452.9 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band XII or
E-UTRA Band 12

698 – 716 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band XIII or
E-UTRA Band 13

777 – 787 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA FDD Band XIV or
E-UTRA Band 14

788 – 798 MHz

-15 dBm

2 CW carriers

1 MHz

UTRA TDD in Band a) or
E-UTRA Band 33

1900 – 1920 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band a), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band a) or
E-UTRA Band 34

2010 – 2025 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band a), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band b) or
E-UTRA Band 35

1850 – 1910 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band b), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band b) or
E-UTRA Band 36

1930 – 1990 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band b), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band c) or
E-UTRA Band 37

1910 – 1930 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band c), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band d) or
E-UTRA Band 38

2570 – 2620 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band d), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band e) or

E-UTRA Band 40

2300 – 2400 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band e), since it is already covered by the requirement in sub-clause 11.1.

UTRA TDD in Band f) or

E-UTRA Band 39

1880 – 1920 MHz

-15 dBm

2 CW carriers

1 MHz

This requirement does not apply to LCR TDD Repeater operating in band f), since it is already covered by the requirement in sub-clause 11.1.

NOTE 1: The co-existence requirements in Table 11.3 do not apply when the repeaters pass band frequency range is adjacent to the band for the co-existence requirement in the Table 11.3. The current state-of-the-art technology does not allow a single generic solution for co-existence.

NOTE 2: The Table 11.3 assumes that two operating bands, where the frequency ranges would be overlapping, are not deployed in the same geographical area. For such a case of operation with overlapping frequency arrangements in the same geographical area, special co-existence requirements may apply that are not covered by the 3GPP specifications.

11.3 Test purpose

The purpose of this test is to verify that the Repeater meets the intermodulation characteristics requirements as specified by the minimum requirements.

11.4 Method of test

11.4.1 Initial conditions

1) A measurement system set-up is shown in annex A.

2) Set the Repeater to maximum gain.

3) Connect two signal generators with a combining circuit or one signal generator with the ability to generate several CW carriers to the input.

4) Connect a spectrum analyser to the output of the Repeater. Set the resolution bandwidth to 1 MHz in the centre of the pass band. Set averaging to 1 second or more.

11.4.2 Procedure

1) Adjust the frequency of the input signals, either below or above the pass band, so that one carrier, f1, is 1 MHz outside the channel edge frequency of the first or last channel in the pass band, and the lowest order intermodulation product from the two carriers is positioned in the centre of the pass band, according to subclause 11.2.

2) Take the measurement of the rise of the output signal.

3) Repeat the measurement for the opposite path of the Repeater.

11.5 Test requirements

The Input intermodulation measured according to subclause 11.4.2 shall not exceed the limits specified in the relevant tables of 11.2.