Adjacent Channel Leakage Power Ratio

In Release 15, the primary evolution for ACLR involved the explicit introduction and refinement of Over-the-Air (OTA) ACLR requirements for base stations, as detailed in TS 37.145-2. This included specific corrections and clarifications to the OTA ACLR test procedure and its associated tables to ensure accurate radiated conformance testing. Furthermore, the release added support for Multi-User (MU) evaluation of ACLR within the Radiated Chamber (RC) test method, as documented in TR 37.843.

• New Annex to TR 37.843: Power density measurements close to EUT TS 37.843CR0006
• Correction to TDD OFF power requirement TS 37.105CR0124
• CR to TS 37.145-2: Corrections on OTA Transmit ON/OFF power TS 37.145CR0042
• CR to TS 37.145-2: OTA Adjacent Channel Leakage Ratio (6.7.3) and OTA Operating band unwanted emissions (6.7.5) - corrections to text and tables TS 37.145CR0055
• Correction to TDD OFF power requirement TS 37.145CR0075
• Addition of power backoff for 256QAM and 1024QAM TS 37.145CR0108

+ 14 more changes

In Release 16, a key update for the ACLR function was a correction to the ACLR limit for operation in non-contiguous spectrum, as specified by a Change Request to TS 37.104. Furthermore, the release extensively expanded the applicability of ACLR requirements by introducing wider channel bandwidths for numerous NR operating bands, including n1, n7, n38, n50, n66, n77, and n78. These new bandwidths, such as 30MHz for n50 and 40MHz for n38, directly defined new channel edges and carrier frequencies to which the ACLR ratio, measured with a Root Raised Cosine filter, would apply.

• Addition channel bandwidth of 30MHz for n50 in TS 38.104 TS 38.104CR0031
• CR for TS 38.104: adding wider channel bandwidths in Band n7 TS 38.104CR0037
• CR for TS 38.104: adding wider channel bandwidths in Band n77/n78 TS 38.104CR0105
• CR for TS 38.104: Addition channel bandwidth of 40MHz for n38 TS 38.104CR0106
• Introducing new channel bandwidth for band n28 TS 38.104CR0131
• CR for TS 38.104: adding wider channel bandwidths for n66 TS 38.104CR0139

+ 27 more changes

In Release 17, the ACLR function was updated to introduce new requirements for 35 MHz and 45 MHz channel bandwidths across multiple technical specifications for both LTE and NR. This included adding support for these new channel bandwidths in existing NR operating bands and correcting related technical reports. Furthermore, specific ACLR requirements were defined for new NR repeater equipment.

• CR to 37.104: Introduction of requirements for 35 and 45MHz channel bandwidths TS 37.104CR0949
• CR for TS 37.141: introduction of channel bandwidths 35MHz and 45MHz TS 37.141CR0990
• CR for TS 37.145-2: introduction of channel bandwidths 35MHz and 45MHz TS 37.145CR0314
• Big CR to 38.104 - Additional Channel BW TS 38.104CR0258
• Big CR to 38.104 - Additional Channel BW TS 38.104CR0291
• Big CR to TS 38.104: Adding channel BW support in existing NR bands TS 38.104CR0319

+ 35 more changes

In Release 18, a key update for ACLR was the separation of additional ACLR requirements specifically for LTE-based 5G terrestrial broadcast systems, as detailed in a Change Request to TS 36.104. This modification introduced distinct technical criteria for broadcast applications within the established framework where ACLR is defined as the ratio of average power measured with a Root Raised Cosine filter. The change ensured that these new broadcast deployments had tailored adjacent channel leakage limits separate from other LTE and NR use cases.

• CR to TS 37.141 - Consideration of NR 3 MHz channel bandwidth TS 37.141CR1068
• Big CR to TS 38.104: Adding channel BW support in existing NR bands TS 38.104CR0450
• Big CR to TS 38.104 on introduction of 3 MHz channel bandwidth TS 38.104CR0500
• Big CR to TS 38.104: Adding channel BW support in existing NR bands TS 38.104CR0512
• Big CR to TS 38.104: Adding channel BW support in existing NR bands TS 38.104CR0538
• CR to TS38.104: Introduction of an enhanced channel raster TS 38.104CR0536

+ 71 more changes

In Release 19, the primary update for ACLR was the introduction of a new 7 MHz channel bandwidth for NR FR1, which necessitated defining the corresponding ACLR requirements and measurement conditions for this new bandwidth. This addition required updates across multiple specification documents to establish the channel bandwidth as a reference for transmitter RF requirements, including ACLR. The changes also included corrections and clarifications related to ACLR measurements for other bandwidths, such as 3 MHz.

• CR to TS37.104 Introduction of 7 MHz NR FR1 channel bandwidth TS 37.104CR1028
• CR to TS 37.105: 7MHz channel bandwidth introduction TS 37.105CR0304
• CR to TS37.141 Introduction of 7 MHz NR FR1 channel bandwidth TS 37.141CR1098
• CR to TS 37.145-2: 7MHz channel bandwidth introduction TS 37.145CR0398
• Big CR to TS 38.104: Adding channel BW support in existing NR bands TS 38.104CR0685
• CR to 38.104 on adding new UL channel bandwidth to band n48 TS 38.104CR0698

+ 39 more changes