1. Single Tx switched UL DRAFT 3GPP RAN #77 September 11 - 14, 2017
Sapporo, Japan
Agenda Item
DRAFT
Single Tx switched UL

2. UE Feature set for LTE-NR UL DC
LTE-NR Band/Channel Combinations (will include at least channel assignment)
Increasing MSD
Easy band/channel combinations (including at least channel assignment)
according to rules in slide 45
Difficult band/channel combinations (including at least channel assignment) according rules in slide 45
UE Feature
Mandatory
Optional
No spec support
Simultaneous 2Tx x
Single Tx switched UL
[x]
UE Feature
Mandatory
Optional
No spec support
Simultaneous 2Tx x
Single Tx switched UL

3. UE Feature set for LTE-NR UL DC (Cont.)
LTE-NR Band/Channel Combinations (will include at least channel assignment)
Increasing MSD
Intermediate band/channel combinations (including at least channel assignment)
UE Feature
Mandatory
Optional
No spec support
Simultaneous 2Tx x
Single Tx switched UL

4. General notes For the previous slides
The categorization of band combinations is up to RAN4
RAN4 is to define a rule for categorization (of band combinations including channel assignments) in order to apply them
A possible rule could be based on presence of resulting IMD[2]…[7] (including harmonics as long as cause includes simultaneous Tx) falling in Rx with the given channel assignment
In addition to indicate support for Simultaneous 2Tx or not, the UE may need to indicate a capability to support case 1 on slide 5. Whether or not a separate capability needs to be defined for that feature will be discussed jointly when UE capabilities are discussed
Note that a potential capability associated to case 1 on slide 5 is band/band combination independent
Note that case 2 on slide 5 is supported in a transparent manner from the UE and no UE capability is needed
Applies to a triplet of CCs
1 LTE PCell UL + 1 NR PSCell UL + 1 NR PSCell DL, or
1 LTE PCell UL + 1 NR PSCell UL + 1 LTE PCell DL

5. Background RAN1 decision RAN1 #90 Agreements:
When the UE is configured with multiple UL carriers on different frequencies (where there is at least one LTE carrier and at least one NR carrier of a different carrier frequency), but the UE operates on only one of the carriers at a given time among a pair of LTE and NR carriers
For LTE carrier, UE can be configured with
Case 1: DL-reference UL/DL configuration defined for LTE-FDD-SCell in LTE-TDD-FDD CA with LTE-TDD-PCell
For scheduling/HARQ timing of LTE FDD carrier, DL-reference UL/DL configuration defined for LTE-FDD-SCell in LTE-TDD-FDD CA with LTE-TDD-PCell is applied
UE is allowed to transmit NR UL signals at least in the subframe(s) where LTE UL transmission is not allowed according to the DL-reference UL/DL configuration
FFS whether or not a UE-specific subframe offset for the DL-reference UL/DL configuration can be configured considering system resource utilization and potential spec impact
Case 2: Release 15 LTE-FDD HARQ timing
No impact on LTE RAN1 specifications
Note: it doesn’t necessarily imply that UE has to support both cases