6.6.4 Adjacent Channel Leakage Power Ratio (ACLR)
37.1043GPPMulti-Standard Radio (MSR) Base Station (BS) radio transmission and receptionNR, E-UTRA, UTRA and GSM/EDGERelease 17TS
Adjacent Channel Leakage Power Ratio (ACLR) is the ratio of the filtered mean power centred on the assigned channel frequency to the filtered mean power centred on an adjacent channel frequency.
6.6.4.1 E-UTRA minimum requirement
For E-UTRA, the minimum requirement for ACLR is specified in Table 6.6.4.1-1 and 6.6.4.1-2 and applies outside the Base Station RF Bandwidth or Radio Bandwidth.
For a BS operating in non-contiguous spectrum, the ACLR also applies for the first adjacent channel inside any sub-block gap with a gap size Wgap ≥ 15MHz. The ACLR requirement for the second adjacent channel applies inside any sub-block gap with a gap size Wgap ≥ 20 MHz. The CACLR requirement in subclause 6.6.4.4 applies in sub block gaps for the frequency ranges defined in Table 6.6.4.4-1.
For a BS operating in multiple bands, where multiple bands are mapped onto the same antenna connector, the ACLR also applies for the first adjacent channel inside any Inter RF Bandwidth gap with a gap size Wgap ≥ 15MHz. The ACLR requirement for the second adjacent channel applies inside any Inter RF Bandwidth gap with a gap size Wgap ≥ 20 MHz.
The CACLR requirement in subclause 6.6.4.4 applies in Inter-RF Bandwidth gaps for the frequency ranges defined in Table 6.6.4.4-1.
The requirements apply during the transmitter ON period.
The ACLR is defined with a square filter of bandwidth equal to the transmission bandwidth configuration of the transmitted signal (BWConfig) centred on the assigned channel frequency and a filter centred on the adjacent channel frequency according to the tables below.
For Category A Wide Area BS, either the ACLR limits in the tables below or the absolute limit of -13dBm/MHz shall apply, whichever is less stringent.
For Category B Wide Area BS, either the ACLR limits in the tables below or the absolute limit of -15dBm/MHz shall apply, whichever is less stringent. For Medium Range BS, either the ACLR limits in the tables below or the absolute limit of -25 dBm/MHz shall apply, whichever is less stringent.
For Local Area BS, either the ACLR limits in the tables below or the absolute limit of -32dBm/MHz shall apply, whichever is less stringent.
For operation in paired spectrum, the ACLR shall be higher than the value specified in Table 6.6.4.1‑1.
Table 6.6.4.1-1: Base Station ACLR in paired spectrum
Channel bandwidth of E-UTRA Lowest/ Highest Carrier transmitted BWChannel [MHz] |
BS adjacent channel centre frequency offset below the lower or above the upper Base Station RF bandwidth edge |
Assumed adjacent channel carrier |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
1.4, 3.0, 5, 10, 15, 20 |
0.5 x BWChannel |
E-UTRA of same BW |
Square (BWConfig) |
45 dB |
1.5 x BWChannel |
E-UTRA of same BW |
Square (BWConfig) |
45 dB |
|
2.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
|
7.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
|
NOTE 1: BWChannel and BWConfig are the channel bandwidth and transmission bandwidth configuration of the E-UTRA Lowest/Highest Carrier transmitted on the assigned channel frequency. NOTE 2: The RRC filter shall be equivalent to the transmit pulse shape filter defined in TS 25.104 [2], with a chip rate as defined in this table. |
For operation in unpaired spectrum, the ACLR shall be higher than the value specified in Table 6.6.4.1‑2.
Table 6.6.4.1-2: Base Station ACLR in unpaired spectrum with synchronized operation
Channel bandwidth of E-UTRA Lowest/ Highest Carrier transmitted BWChannel [MHz] |
BS adjacent channel centre frequency offset below the lower or above the upper Base Station RF Bandwidth edge |
Assumed adjacent channel carrier |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
1.4, 3 |
0.5 x BWChannel |
E-UTRA of same BW |
Square (BWConfig) |
45 dB |
1.5 x BWChannel |
E-UTRA of same BW |
Square (BWConfig) |
45 dB |
|
0.8 MHz |
1.28 Mcps UTRA |
RRC (1.28 Mcps) |
45 dB |
|
2.4 MHz |
1.28 Mcps UTRA |
RRC (1.28 Mcps) |
45 dB |
|
5, 10, 15, 20 |
0.5 x BWChannel |
E-UTRA of same BW |
Square (BWConfig) |
45 dB |
1.5 x BWChannel |
E-UTRA of same BW |
Square (BWConfig) |
45 dB |
|
0.8 MHz |
1.28 Mcps UTRA |
RRC (1.28 Mcps) |
45 dB |
|
2.4 MHz |
1.28 Mcps UTRA |
RRC (1.28 Mcps) |
45 dB |
|
2.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
|
7.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
|
5 MHz |
7.68 Mcps UTRA |
RRC (7.68 Mcps) |
45 dB |
|
15 MHz |
7.68 Mcps UTRA |
RRC (7.68 Mcps) |
45 dB |
|
NOTE 1: BWChannel and BWConfig are the channel bandwidth and transmission bandwidth configuration of the E-UTRA Lowest/Highest Carrier transmitted on the assigned channel frequency. NOTE 2: The RRC filter shall be equivalent to the transmit pulse shape filter defined in TS 25.105 [3], with a chip rate as defined in this table. |
For operation in non-contiguous paired spectrum, the ACLR shall be higher than the value specified in Table 6.6.4.1‑3.
Table 6.6.4.1-3: Base Station ACLR in non-contiguous paired spectrum
Sub-block gap size (Wgap) where the limit applies |
BS adjacent channel centre frequency offset below or above the sub-block edge (inside the gap) |
Assumed adjacent channel carrier |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
Wgap ≥ 15 MHz |
2.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
Wgap ≥ 20 MHz |
7.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
NOTE: The RRC filter shall be equivalent to the transmit pulse shape filter defined in TS 25.104 [2], with a chip rate as defined in this table. |
For operation in non-contiguous unpaired spectrum, the ACLR shall be higher than the value specified in Table 6.6.4.1‑4.
Table 6.6.4.1-4: Base Station ACLR in non-contiguous unpaired spectrum
Sub-block gap size (Wgap) where the limit applies |
BS adjacent channel centre frequency offset below or above the sub-block edge (inside the gap) |
Assumed adjacent channel carrier (informative) |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
Wgap ≥ 15 MHz |
2.5 MHz |
5MHz E-UTRA carrier |
Square (BWConfig) |
45 dB |
Wgap ≥ 20 MHz |
7.5 MHz |
5MHz E-UTRA carrier |
Square (BWConfig) |
45 dB |
6.6.4.2 UTRA FDD minimum requirement
For UTRA FDD, the minimum requirement for ACLR is specified in TS 25.104 [2], subclause 6.6.2.2, and applies outside the Base Station RF Bandwidth or Radio Bandwidth.
For a BS operating in non-contiguous spectrum, ACLR requirement also applies for the first adjacent channel, inside any sub-block gap with a gap size Wgap ≥ 15 MHz. The ACLR requirement for the second adjacent channel applies inside any sub-block gap with a gap size Wgap ≥ 20 MHz. The CACLR requirement in subclause 6.6.4.4 applies in sub block gaps for the frequency ranges defined in Table 6.6.4.4-1.
For a BS operating in multiple bands, where multiple bands are mapped onto the same antenna connector, ACLR requirement also applies for the first adjacent channel, inside any Inter RF Bandwidth gap with a gap size Wgap ≥ 15 MHz. The ACLR requirement for the second adjacent channel applies inside any Inter RF Bandwidth gap with a gap size Wgap ≥ 20 MHz. The CACLR requirement in subclause 6.6.4.4 applies in Inter RF Bandwidth gaps for the frequency ranges defined in Table 6.6.4.4-1.
6.6.4.3 UTRA TDD minimum requirement
For UTRA TDD, the minimum requirement for ACLR is specified in TS 25.105 [3], subclause 6.6.2.2.1.2, and applies outside the Base Station RF Bandwidth or Radio Bandwidth.
6.6.4.4 Cumulative ACLR requirement in non-contiguous spectrum
The following requirement applies for the sub-block or Inter RF Bandwidth gap sizes listed in Table 6.6.4.4-1:
– Inside a sub-block gap within an operating band for a BS operating in non-contiguous spectrum.
– Inside an Inter RF Bandwidth gap for a BS operating in multiple bands, where multiple bands are mapped on the same antenna connector.
The Cumulative Adjacent Channel Leakage Power Ratio (CACLR) in a sub-block gap or the Inter RF Bandwidth gap is the ratio of
a) the sum of the filtered mean power centred on the assigned channel frequencies for the two carriers adjacent to each side of the sub-block gap or the Inter RF Bandwidth gap, and
b) the filtered mean power centred on a frequency channel adjacent to one of the respective sub-block edges or Base Station RF Bandwidth edges.
The requirement applies to adjacent channels of NR, E-UTRA or UTRA carriers allocated adjacent to each side of the sub-block gap or the Inter RF Bandwidth gap. The assumed filter for the adjacent channel frequency is defined in Table 6.6.4.4-1 and the filters on the assigned channels are defined in Table 6.6.4.4-2.
NOTE: If the RAT on the assigned channel frequencies are different, the filters used are also different.
For Wide Area Category A BS, either the CACLR limits in Table 6.6.4.4-1 or the absolute limit of -13dBm/MHz shall apply, whichever is less stringent.
For Wide Area Category B BS, either the CACLR limits in Table 6.6.4.4-1 or the absolute limit of -15dBm/MHz shall apply, whichever is less stringent.
For Medium Range BS, either the CACLR limits in Table 6.6.4.4-1 or the absolute limit of -25 dBm/MHz shall apply, whichever is less stringent.
For Local Area BS, either the CACLR limits in Table 6.6.4.4-1 or the absolute limit of -32 dBm/MHz shall apply, whichever is less stringent.
The CACLR for E-UTRA and UTRA carriers located on either side of the sub-block gap or the Inter RF Bandwidth gap shall be higher than the value specified in Table 6.6.4.4-1.
Table 6.6.4.4-1: Base Station CACLR in non-contiguous spectrum or multiple bands
Band Category |
Sub-block or Inter RF Bandwidth gap size (Wgap) where the limit applies [MHz] |
BS adjacent channel centre frequency offset below or above the sub-block edge or the Base Station RF Bandwidth edge (inside the gap) |
Assumed adjacent channel carrier (informative) |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
CACLR limit |
BC1, BC2 |
5 ≤ Wgap < 15 (Note 3) |
2.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
BC1, BC2 |
10 < Wgap < 20 (Note 3) |
7.5 MHz |
3.84 Mcps UTRA |
RRC (3.84 Mcps) |
45 dB |
BC3 |
5 ≤ Wgap < 15 (Note 3) |
2.5 MHz |
5MHz E-UTRA |
Square (BWConfig) |
45 dB |
BC3 |
10 < Wgap < 20 (Note 3) |
7.5 MHz |
5MHz E-UTRA |
Square (BWConfig) |
45 dB |
BC1, BC2, BC3 |
5 ≤ Wgap < 45 (Note 4) |
2.5 MHz |
5 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
BC1, BC2, BC3 |
10 ≤ Wgap < 50 (Note 4) |
7.5 MHz |
5 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
BC1, BC2, BC3 |
20 ≤ Wgap < 30 (Note 3, 5) |
10 MHz |
20 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
BC1, BC2, BC3 |
20 ≤ Wgap < 60 (Note 4) |
10 MHz |
20 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
BC1, BC2, BC3 |
40 ≤ Wgap < 50 (Note 3, 5) |
30 MHz |
20 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
BC1, BC2, BC3 |
40 ≤ Wgap < 80 (Note 4) |
30 MHz |
20 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
NOTE 1: The RRC filter shall be equivalent to the transmit pulse shape filter defined in TS 25.104 [2], with a chip rate as defined in this table. NOTE 2: With SCS that provides largest transmission bandwidth configuration (BWConfig). NOTE 3: Applicable in case the channel bandwidth of the carrier transmitted at the other edge of the gap is 5, 10, 15, 20 MHz. NOTE 4: Applicable in case the channel bandwidth of the NR carrier transmitted at the other edge of the gap is 25, 30, 40, 50, 60, 70, 80, 90, 100 MHz. NOTE 5: Applicable in case the channel bandwidth of the lowest/highest NR carrier transmitted is 25, 30, 40, 50, 60, 70, 80, 90, 100 MHz. |
Table 6.6.4.4-2: Filter parameters for the assigned channel
RAT of the carrier adjacent to the sub-block and Inter RF Bandwidth gap |
Filter on the assigned channel frequency and corresponding filter bandwidth |
E-UTRA |
E-UTRA of same BW |
UTRA FDD |
RRC (3.84 Mcps) |
NR |
NR of same BW with SCS that provides largest transmission bandwidth configuration |
NOTE: The RRC filter shall be equivalent to the transmit pulse shape filter defined in TS 25.104 [2], with a chip rate as defined in this table. |
6.6.4.5 NB-IoT minimum requirement
For NB-IoT in-band and guard band operation, the E-UTRA minimum requirement specified in clause 6.6.4.1 shall apply.
For NB-IoT standalone operation, the ACLR shall be higher than the value specified in Table 6.6.4.5-1.
Table 6.6.4.5-1: Base Station ACLR for NB-IoT standalone operation
Channel bandwidth of standalone NB-IoT lowest/highest carrier transmitted BWChannel |
BS adjacent channel centre frequency offset below the lowest or above the highest carrier centre frequency transmitted |
Assumed adjacent channel carrier (informative) |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
200 kHz |
300 kHz |
Standalone NB-IoT |
Square (BWConfigl) |
40 dB |
500 kHz |
Standalone NB-IoT |
Square (BWConfig) |
50 dB |
|
NOTE 1: BWConfig is the transmission bandwidth configuration of the E-UTRA Lowest/Highest Carrier transmitted on the assigned channel frequency. |
6.6.4.6 NR minimum requirement
For NR, the minimum requirements shall apply outside the Base Station RF Bandwidth or Radio Bandwidth whatever the type of transmitter considered (single carrier or multi-carrier) and for all transmission modes foreseen by the manufacturer’s specification.
For a BS operating in non-contiguous spectrum, the ACLR requirement shall apply in sub-block gaps for the frequency ranges defined in table 6.6.4.6-2a, while the CACLR requirement shall apply in sub-block gaps for the frequency ranges defined in table 6.6.4.4-1.
For BS operating in multiple bands, where multiple bands are mapped onto the same antenna connector, the ACLR requirement shall apply in Inter RF Bandwidth gaps for the frequency ranges defined in table 6.6.4.6-2a, while the CACLR requirement in subclause 6.6.4.4 shall apply in Inter RF Bandwidth gaps for the frequency ranges defined in table 6.6.4.4-1.
The requirement shall apply during the transmitter ON period. The ACLR is defined with a square filter of bandwidth equal to the transmission bandwidth configuration of the transmitted signal (BWConfig) centred on the assigned channel frequency and a filter centred on the adjacent channel frequency according to the tables below.
The ACLR absolute limit in table 6.6.4.6-2 or the ACLR (CACLR) limit in table 6.6.4.6-1, 6.6.4.6-2a or 6.6.4.4-1, whichever is less stringent, shall apply for each antenna connector.
For operation in paired and unpaired spectrum, the ACLR shall be higher than the value specified in table 6.6.4.6‑1.
For Band 41 NR operation in Japan, absolute ACLR limits shall be applied to the sum of the absolute ACLR power over all antenna connectors.
Table 6.6.4.6-1: Base station ACLR limit
Channel bandwidth of lowest/highest NR carrier transmitted BWChannel [MHz] |
BS adjacent channel centre frequency offset below the lowest or above the highest carrier centre frequency transmitted |
Assumed adjacent channel carrier (informative) |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90,100 |
BWChannel |
NR of same BW (Note 2) |
Square (BWConfig) |
45 dB |
2 x BWChannel |
NR of same BW (Note 2) |
Square (BWConfig) |
45 dB |
|
BWChannel /2 + 2.5 MHz |
5 MHz E-UTRA |
Square (4.5 MHz) |
45 dB (Note 3) |
|
BWChannel /2 + 7.5 MHz |
5 MHz E-UTRA |
Square (4.5 MHz) |
45 dB (Note 3) |
|
NOTE 1: BWChannel and BWConfig are the channel bandwidth and transmission bandwidth configuration of the lowest/highest NR carrier transmitted on the assigned channel frequency. NOTE 2: With SCS that provides largest transmission bandwidth configuration (BWConfig). NOTE 3: The requirements are applicable when the band is also defined for E-UTRA or UTRA. |
The ACLR absolute limit is specified in table 6.6.4.6‑2.
Table 6.6.4.6-2: Base station ACLR absolute limit
BS category / BS class |
ACLR absolute limit |
Category A Wide Area BS |
-13 dBm/MHz |
Category B Wide Area BS |
-15 dBm/MHz |
Medium Range BS |
-25 dBm/MHz |
Local Area BS |
-32 dBm/MHz |
For operation in non-contiguous spectrum or multiple bands, the ACLR shall be higher than the value specified in Table 6.6.4.6‑2a.
Table 6.6.4.6-2a: Base Station ACLR limit in non-contiguous spectrum or multiple bands
Channel bandwidth of lowest/highest NR carrier transmitted BWChannel [MHz] |
Sub-block or Inter RF Bandwidth gap size (Wgap) where the limit applies [MHz] |
BS adjacent channel centre frequency offset below or above the sub-block or Base Station RF Bandwidth edge (inside the gap) |
Assumed adjacent channel carrier |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
5, 10, 15, 20 |
Wgap ≥ 15 (Note 3) Wgap ≥ 45 (Note 4) |
2.5 MHz |
5 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
Wgap ≥ 20 (Note 3) Wgap ≥ 50 (Note 4) |
7.5 MHz |
5 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
|
25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100 |
Wgap ≥ 60 (Note 4) Wgap ≥ 30 (Note 3) |
10 MHz |
20 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
Wgap ≥ 80 (Note 4) Wgap ≥ 50 (Note 3) |
30 MHz |
20 MHz NR (Note 2) |
Square (BWConfig) |
45 dB |
|
NOTE 1: BWConfig is the transmission bandwidth configuration of the assumed adjacent channel carrier. NOTE 2: With SCS that provides largest transmission bandwidth configuration (BWConfig). NOTE 3: Applicable in case the channel bandwidth of the carrier transmitted at the other edge of the gap is 5, 10, 15, 20 MHz. NOTE 4: Applicable in case the channel bandwidth of the NR carrier transmitted at the other edge of the gap is 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100 MHz.. |