1. WF on single Tx switched UL
3GPP TSG-RAN WG4#84bis Meeting
Dubrovnik, CR, Oct. 9-13, 2017
R4-17XXXXX
WF on single Tx switched UL
NTT DOCOMO,…

2. Proposed WF (1)
RAN4 is to define a rule for categorization (of band combinations including channel assignments), based on presence of resulting IMD2,3 (including harmonics as long as the cause includes simultaneous Tx) falling in Rx with the given channel assignment [RP ]
RAN4 should complete their tasks by December 2017 to allow the feature to be introduced to the specifications [RP ]

3. Proposed WF (2)
If IMD2 (or 3) is falling in Rx channel assignment of PCell/PSCell , simultaneous UL is optional, otherwise it shall be mandatory according to RAN guidance
Whether simultaneous UL is optional is decided based on exact range of IMDs. Exact range of IMD 2 (or 3) is calculated by the following equations and it should be captured in RAN4 specification.
Interference bandwidth: IBW = |a| x CBW1 + |b| x CBW2
|a| + |b| = 2 (or 3)
CBW1 and CBW2 are channel assignment of UL signals configured by the NW
Center freq. of IBW: fIBW = a x f1 + b x f2
f1 and f2 are center frequency of each UL signal
The range of IMD 2 (or 3): [fIBW – IBW/2, fIBW + IBW/2]
Case 1
Case 2a
Case 2b f
Rx channel
IMD2 f
Rx channel
IMD2 f
Rx channel
IMD2
Mandatory
Optional
Optional until December but further enhancement can be considered after December

4. E-UTRA Band / NRBand/ Channel bandwidth / NRB / Duplex mode
Proposed WF (3)
For case 2a/2b, UE capability is introduced to indicate UE does not support simultaneous UL. In addition, UE capability to indicate that UE supports simultaneous UL with various (maximally 4 kind of ) MSD requirements is also introduced for case 2a/2b
Above UE capabilities are per band combination basis
Example of MSD requirements for the latter capability is shown in below table. The exact values of MSD will be investigated after December 2017
Send LS to RAN2 to inform RAN4 agreements
E-UTRA Band / NRBand/ Channel bandwidth / NRB / Duplex mode
Source of IMD
Bit map
LTE-NR DC
Configuration
band
UL Fc (MHz)
UL/DL BW (MHz)
UL CLRB
DL Fc (MHz)
MSD (dB)
Duplex mode
DC_3A-n78A 3
1740 5 25
1835 30
FDD
IMD2
’00’
n78
3575
N/A
TDD 20
‘01’ 10
’10’
‘11’