TR 36.770
High Power UE (Power Class 2) for LTE FDD Band 14
V18.0.0 (Wzip)
2024/03 15 p.
- Rapporteur:
- Mr. Borsato, Ronald
AT&T
full Table of Contents for TR 36.770 Word version: 18.0.0
1 Scope
2 References
3 Definitions of terms, symbols and abbreviations
4 Background
5 SAR Scheme
6 RF Performance
7 UE implementations
8 Conclusions
$ Change history
1 Scope p. 6
The present document is a technical report for High Power UE (power class 2) for LTE FDD Band 14. The purpose is to gather the relevant background information and outcome of evaluations to complete the band specific requirements.
2 References p. 6
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
3 Definitions of terms, symbols and abbreviations p. 6
3.1 Terms p. 6
For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Carrier aggregation:
Aggregation of two or more component carriers in order to support wider transmission bandwidths.
Channel bandwidth:
The RF bandwidth supporting a single E-UTRA RF carrier with the transmission bandwidth configured in the uplink or downlink of a cell. The channel bandwidth is measured in MHz and is used as a reference for transmitter and receiver RF requirements.
Channel edge:
The lowest and highest frequency of the carrier, separated by the channel bandwidth.
3.2 Symbols p. 6
For the purposes of the present document, the following symbols apply:
LCRB
Transmission bandwidth which represents the length of a contiguous resource block allocation expressed in units of resources blocks
RBstart
Indicates the lowest RB index of transmitted resource blocks.
3.3 Abbreviations p. 7
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
A-MPR
Additional Maximum Power Reduction
CA
Carrier Aggregation
CBW
Channel BandWidth
DC
Dual Connectivity
FDD
Frequency Division Duplex
EVM
Error Vector Magnitude
HPUE
High Power User Equipment
MPR
Maximum Power Reduction
PA
Power Amplifier
P-MPR
Power Management Maximum Power Reduction
REFSENS
Reference Sensitivity power level
RSD
Reference Sensitivity Degradation
SAR
Specific Absorption Rate
SEM
Spectrum Emissions Mask
TDD
Time Division Duplex
UE
User Equipment
WOLA
Weighted OverLap and Add
4 Background p. 7
4.1 Justification p. 7
Increasing the transmit power of the UE has significant benefits on extending uplink coverage area and improving the experience of cell edge users. In Rel-16 several study/work items related to HPUE have been proposed and worked on to standardize the requirements for EN-DC (FDD 23dBm+TDD 23/26dBm) scenarios. In Rel-17, PC2 HPUE for NR CA and SUL is also specified. In Rel-18, a new work item was introduced to address single band HPUE (PC2) operation in lower-frequency NR FDD bands.
However, extension of uplink coverage for lower-frequency LTE FDD band is very important for operators and to support public safety scenarios. The increment of UE transmit power would bring performance gain for both cell average and cell edge cases, which were verified under various power control parameters as one of the conclusions in Rel-17 Study on high power UE (power class 2) for one NR FDD band in TR 38.861.
In the Rel-17 WI on NR_PC2_UE_FDD, RF requirements including Tx power and tolerance, A-MPR and receiver sensitivity degradation requirements were specified for NR FDD band n1 and n3 under PC2 operation. And there are some further requests proposed by operators on PC2 for more NR FDD bands, including lower-frequency bands in the Rel-18 WI on HPUE_NR_FR1_FDD_R18 to fulfil the commercial deployment demands. It is expected that much of the technical analysis performed for HPUE operation in lower-frequency NR FR1 FDD bands can be leveraged for lower-frequency LTE FDD bands.
This Work Item is proposed to work on specifying RF requirements for HPUE (PC2) operation for LTE FDD band 14.
4.2 Objectives p. 7
The objectives of the core part are as follows:
-
Specify the band specific RF requirements for power class 2 LTE Band 14 including
- UE maximum output power and Tx power tolerance
- A-MPR requirements if needed
- PC2 sensitivity degradation requirements if needed
5 SAR Scheme p. 8
6 RF Performance p. 8
6.1 UE maximum output power p. 8
6.2 A-MPR p. 8
6.2.1 NS_06 p. 8
6.3 Receiver sensitivity degradation evaluation p. 11
7 UE implementations p. 12
8 Conclusions p. 13
$ Change history p. 14
