2019/03 77 p.
Currently, 3GPP has defined only Power Class UE 3 as the type of UE supported for TDD LTE band 41 operations.
This definition was based on aligning TDD LTE Band 41 UE power classes with prior work in 3GPP related to other
bands. However, it should be mentioned that 3GPP UE Power Class 3 definition (i.e. 23dBm) was mainly driven to
ensure backward compatibility with prior technologies (i.e. GSM/UMTS) so that network deployment topologies
remain similar. Furthermore, maintaining the same power class UE definition (i.e. Class 3) as previous technologies
would maintaining compliance with various national regulatory rulings, particularly in terms of SAR, for FDD LTE
However, TDD LTE band 41 does not have any 3GPP legacy technologies associated with it, hence the backward
compatibility consideration is not applicable in its case. Also, since band 41 is defined as a TDD LTE band, it is less
susceptible to SAR levels that FDD LTE bands due to SAR definition. Therefore, defining a new UE power class with
higher than 23dBm Tx power for TDD LTE Band 41 operations would not compromise any of 3GPP foundational
work, while improving UE and network performance. It should also be mentioned that 3GPP has done similar work on
other bands (i.e. band 14) when defining a higher power class UE, hence the concept presented in this document is a
continuation of that process.
The present document carries out a feasibility analysis for defining a UE Power class 2 (i.e. 26dBm) for operation on
TDD LTE band 41. The document analyses current and future technological advancements in the area of UE RF frontend
components and architectures that enable such definition while maintaining 3GPP specification and other
regulatory bodies' requirements. It should be emphasized that this proposal only relates to single carrier UL operations
on TDD band 41 (i.e. TM-1/2 modes) without affecting current 3GPP definition for UL carrier aggregation on band 41.
The scope of the present document is to evaluate the feasibility of increasing UL TX power in Band 41 from 23dBm +/-
2dB (Power Class 3) to 26dBm +/-2dB (Power Class 2) as well as discuss impacts (if any) to other 3GPP bands and