Content for TR 38.868 Word version: 17.0.0
1 Scope
2 References
3 Definitions, symbols and abbreviations
3.1 Definitions
3.2 Symbols
3.3 Abbreviations
4 Background
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1 Scope Word‑p. 6
This document is a technical report for optimization of pi/2 BPSK NR uplink power in Rel-17. The purpose is to evaluate the feasibility of increasing the UE's uplink power in TDD bands for pi/2 BPSK modulation assuming use of existing UE power classes as indicated per band or band combination. The objectives are applicable to FR1 TDD bands n34, n39, n40, n41, n77, n78 and n79. The justification and objectives of this work item are outlined in clause 4.1 and clause 4.2.
2 References Word‑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.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
3GPP TR 30.007: "Guideline on WI/SI for new Operating Bands".
[3]
TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".
[4]
TS 38.101-2: "NR; User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone".
[5]
TS 38.101-3: "NR; User Equipment (UE) radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios".
3 Definitions, symbols and abbreviations Word‑p. 6
3.1 Definitions Word‑p. 6
For the purposes of the present document, the terms and definitions 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.
3.2 Symbols Word‑p. 6
For the purposes of the present document, the following symbols apply:
3.3 Abbreviations Word‑p. 6
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.
ACLR
Adjacent Channel Leakage Ratio
ACS
Adjacent Channel Selectivity
AGC
Automatic Gain Control
A-MPR
Additional Maximum Power Reduction
BLER
BLock Error Rate
BS
Base Station
CBW
Channel Bandwidth
CDF
Cumulative Distribution Function
CP-OFDM
Cyclic Prefix-OFDM
DMRS
Demodulation Reference Signal
DSRC
Dedicated Short-Range Communications
EIRP
Equivalent Isotropically Radiated Power
EVM
Error Vector Magnitude
FDD
Frequency Division Duplex
FDM
Frequency Division Multiplexing
FR1
Frequency Range 1
FR2
Frequency Range 2
ITS
Intelligent Transportation System
LDPC
Low Density Parity Check
LTE
Long Term Evolution
LOS
Line-Of-Sight
MPR
Maximum Power Reduction
NF
Noise Figure
NLOS
Non-Line-Of-Sight
NR
New Radio
OLPC
Open Loop Power Control
PC
Power Control
PRB
Physical Resource Block
PRR
Package Reception Ratio
ProSe
Proximity-based Services
PSCCH
Physical Sidelink Control CHannel
PSSCH
Physical Sidelink Shared CHannel
REFSENS
Reference Sensitivity
RF
Radio Frequency
SCS
Sub-Carrier Spacing
SINR
Signal to Interference plus Noise Ratio
SL
Sidelink
SNR
Signal-to-Noise Ratio
TDD
Time Division Duplex
TDM
Time Division Multiplexing
UE
User Equipment
UL
Uplink
V2V
Vehicle to Vehicle
V2X
Vehicle to Everything
4 Background Word‑p. 7
4.1 Justification Word‑p. 7
Coverage enhancement is a study item led by RAN1 for Rel-17. It has been identified that uplink channels are the bottleneck in many of the evaluated scenarios in terms of the coverage achieved. Given a fixed number of antennas and fixed MCS choices, an improvement in the uplink link budget is only possible through an increase in the UE's UL power.
The current MPR tables may not fully exploit spectrum shaping of pi/2 BPSK waveforms. Meaningful reduction in MPR for certain waveforms could be achieved if UEs exclusively rely on 'strong' shaping. Increase in maximum achievable power may also be feasible relative to the MPR0 power level. For PC2 devices MPR1 is the output power level at which the ACLR=31 dBc obtained with a QPSK full RB DFT-S_OFDM waveform. The output power MPR0 is defined as, MPR0=MPR1+1dB.
Using precedent in Rel-15 and Rel-16 for high power transmissions, duty cycle restrictions will help maintain average power levels at 23 dBm for compliance with SAR requirements.
In this study item, we propose to exploit strong spectrum shaping to realize UL power gains for pi2BPSK waveforms.
4.2 Objective Word‑p. 8
The objective of this study is to evaluate the feasibility of increasing the UE's uplink power in TDD bands for pi/2 BPSK modulation assuming use of existing UE power classes as indicated per band or band combination. The objectives are applicable to FR1 TDD bands n34, n39, n40, n41, n77, n78 and n79.
- Identify achievable UE Tx power for pi/2 BPSK with the filter studied in this study item. [RAN4]
- Evaluate SAR-related duty-cycle restrictions and reporting mechanisms [RAN4]
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Identify filter characteristics necessary to enable the new power capability while ensuring good and robust BS receiver performance. [RAN4]
- The choice of filters is up to UE implementations and transparent to the network
- Evaluate possible pulse shaping filter requirement applicable to the identified new UE power capability if achievable [RAN4]
- Identify if necessary, changes that are needed to EVM equalizer flatness mask requirements to capture necessary filter. Changes to the existing 14 dB p-p baseline to be assessed in relation to any potential gains in UL link performance while still ensuring robust BS receiver performance for all UEs in a cell. [RAN4]
