6.7 Transmitter intermodulation
36.1043GPPBase Station (BS) radio transmission and receptionEvolved Universal Terrestrial Radio Access (E-UTRA)Release 18TS
The transmit intermodulation requirement is a measure of the capability of the transmitter to inhibit the generation of signals in its non linear elements caused by presence of the wanted signal and an interfering signal reaching the transmitter via the antenna. The requirement applies during the transmitter ON period and the transmitter transient period.
For BS capable of multi-band operation where multiple bands are mapped on separate antenna connectors, the single-band requirements apply regardless of the interfering signals position relative to the Inter RF Bandwidth gap.
6.7.1 Minimum requirement
The transmitter intermodulation level is the power of the intermodulation products when an E-UTRA signal of channel bandwidth 5 MHz as an interfering signal is injected into the antenna connector.
The transmitter intermodulation level shall not exceed the unwanted emission limits in clauses 6.6.2, 6.6.3 and 6.6.4 in the presence of an E-UTRA interfering signal according to Table 6.7.1-1, Table 6.7.1-2 and Table 6.7.1-3.
The requirement is applicable outside the Base Station RF Bandwidth or Radio Bandwidth. The interfering signal offset is defined relative to the Base Station RF Bandwidth edges or Radio Bandwidth edges.
For a BS operating in non-contiguous spectrum, the requirement is also applicable inside a sub-block gap for interfering signal offsets where the interfering signal falls completely within the sub-block gap. The interfering signal offset is defined relative to the sub-block edges.
For a BS capable of multi-band operation, the requirement applies relative to the Base Station RF Bandwidth edges of each supported operating band. In case the Inter RF Bandwidth gap is less than 15 MHz, the requirement in the gap applies only for interfering signal offsets where the interfering signal falls completely within the Inter RF Bandwidth gap.
For E-UTRA, the wanted signal and interfering signal centre frequency offset shall be as in Table 6.7.1-1.
Table 6.7.1-1 Interfering and wanted signals for the Transmitter intermodulation requirement for E-UTRA
|
Parameter |
Value |
|
Wanted signal |
E-UTRA single carrier, or multi-carrier, or multiple intra-band contiguously or non-contiguously aggregated carriers |
|
Interfering signal type |
E-UTRA signal of channel bandwidth 5 MHz |
|
Interfering signal level |
Rated total output power in the operating band – 30 dB |
|
Interfering signal centre frequency offset from the lower/upper edge of the wanted signal or edge of sub-block inside a sub-block gap |
± 2.5 MHz ± 7.5 MHz ± 12.5 MHz |
|
NOTE1: Interfering signal positions that are partially or completely outside of any downlink operating band of the base station are excluded from the requirement, unless the interfering signal positions fall within the frequency range of adjacent downlink operating bands in the same geographical area. In case that none of the interfering signal positions fall completely within the frequency range of the downlink operating band, TS 36.141 [4] provides further guidance regarding appropriate test requirements. NOTE2: In certain regions, NOTE1 is not applied in Band 1, 3, 8, 9, 11, 18, 19, 21, 28, 32 operating within 1475.9-1495.9MHz, 34, 74. |
|
For NB-IoT in-band and guard band operation, the wanted signal and interfering signal centre frequency offset shall be as in Table 6.7.1‑2.
Table 6.7.1-2 Interfering and wanted signals for the Transmitter intermodulation requirement for NB-IoT in-band and guard band operations
|
Parameter |
Value |
|
Wanted signal |
E-UTRA single carrier, or multi-carrier, or multiple intra-band contiguously or non-contiguously aggregated carriers with NB-IoT in-band and/or guard band operation |
|
Interfering signal type |
E-UTRA signal of channel bandwidth 5 MHz |
|
Interfering signal level |
Rated total output power in the operating band – 30 dB |
|
Interfering signal centre frequency offset from the lower/upper edge of the wanted signal or edge of sub-block inside a sub-block gap |
± 2.5 MHz ± 7.5 MHz ± 12.5 MHz |
|
NOTE1: Interfering signal positions that are partially or completely outside of any downlink operating band of the base station are excluded from the requirement, unless the interfering signal positions fall within the frequency range of adjacent downlink operating bands in the same geographical area. In case that none of the interfering signal positions fall completely within the frequency range of the downlink operating band, TS 36.141 [4] provides further guidance regarding appropriate test requirements. NOTE2: In certain regions, NOTE1 is not applied in Band 1, 3, 8, 9, 11, 18, 19, 21, 28, 32 operating within 1475.9-1495.9MHz, 34, 74. |
|
For NB-IoT standalone operation, the wanted signal and interfering signal centre frequency offset shall be as in Table 6.7.1‑3.
Table 6.7.1-3 Interfering and wanted signals for the Transmitter intermodulation requirement for standalone NB-IoT
|
Parameter |
Value |
|
Wanted signal |
Standalone NB-IoT carrier |
|
Interfering signal type |
E-UTRA signal of channel bandwidth 5 MHz |
|
Interfering signal level |
Rated total output power in the operating band – 30 dB |
|
Interfering signal centre frequency offset from the lower/upper edge of the wanted signal or edge of sub-block inside a sub-block gap |
± 2.5 MHz ± 7.5 MHz ± 12.5 MHz |
|
NOTE1: Interfering signal positions that are partially or completely outside of any downlink operating band of the base station are excluded from the requirement, unless the interfering signal positions fall within the frequency range of adjacent downlink operating bands in the same geographical area. In case that none of the interfering signal positions fall completely within the frequency range of the downlink operating band, TS 36.141 [4] provides further guidance regarding appropriate test requirements. NOTE2: In certain regions, NOTE1 is not applied in Band 1, 3, 8, 9, 11, 18, 19, 21, 28, 32 operating within 1475.9-1495.9MHz, 34, 74. |
|
6.7.2 Additional requirement for Band 41
In certain regions the following requirement may apply. For E-UTRA BS operating in Band 41, the transmitter intermodulation level shall not exceed the maximum levels specified in Table 6.6.2.1-2 with a square filter in the first adjacent channel, and Table 6.6.4.3.1-6 in the presence of an interfering signal according to Table 6.7.2‑1.
Table 6.7.2-1 Interfering and wanted signals for the additional transmitter intermodulation requirement for Band 41
|
Parameter |
Value |
|
Wanted signal |
E-UTRA single carrier (NOTE) |
|
Interfering signal type |
E-UTRA signal of the same channel bandwidth as the wanted signal |
|
Interfering signal level |
Rated total output power in the operating band – 30 dB |
|
Interfering signal centre frequency offset from the lower/upper carrier centre frequency of the wanted signal |
± BWChannel ± 2 x BWChannel |
|
NOTE: This requirement applies for 10 or 20 MHz E-UTRA carriers allocated within 2545-2645 MHz. |
|