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Summary of Agreements by Topic
1. Cross-Carrier Scheduling (CCS) from SCell to PCell
- Allowed Scheduling Combinations:
- Self-scheduling on PCell/PSCell is allowed.
- Cross-carrier scheduling from PCell/PSCell to another
SCell is not allowed.
- Self-scheduling on the SCell used for scheduling
PCell/PSCell is allowed.
- Cross-carrier scheduling from the SCell used for
scheduling PCell/PSCell to another serving cell is allowed.
- Cross-carrier scheduling from another serving cell to the
SCell used for scheduling PCell/PSCell is not allowed.
- DCI Format Handling:
- DCI formats 0_0/1_0 are monitored for self-scheduling in
PCell and SCell.
- No changes introduced to DCI format monitoring rules.
- Padding is applied to align DCI sizes between PCell and
SCell for CCS.
- Simultaneous Monitoring:
- Type A UEs do not support simultaneous monitoring of USS
sets on sSCell and Type 0/0A/1/2 CSS sets on PCell for unicast DCI
formats.
- Type B UEs can monitor overlapping USS and CSS sets.
- Numerology Restrictions:
- When PCell and sSCell use different numerologies, PDSCH
reception preparation time is applied as per TS 38.214 Section 5.5.
- Capability Signaling:
- Separate UE capabilities introduced for handling scaling
factors during sSCell activation/deactivation and dormant BWP switching.
2. Multi-Cell PDSCH Scheduling via a Single DCI
- Feature Status:
- RAN1 decided to stop work on two-cell PDSCH scheduling
via a single DCI for Rel-17 DSS.
- Further study for Rel-18 may include more than two
carriers for both UL and DL within FR1 and FR2.
3. Efficient Activation/Deactivation Mechanism for SCells
- Temporary Reference Signals (TRS):
- TRS is selected as the temporary RS for SCell activation.
- TRS triggering is handled via MAC-CE or DCI, with options
for bitmap-based or A-TRS framework reuse.
- Activation Timing:
- The earliest slot for a UE to receive a triggered
temporary RS is the last DL slot of the to-be-activated SCell overlapping
with slot n+k as defined in TS 38.213 sub-clause 4.3.
- Configuration Details:
- CSI-RS resources within one resource set should be
configured with the same TCI state.
- CSI-RS for tracking cannot use two NZP CSI-RS resources
in one slot.
- Capability Enhancements:
- New FG35-2 introduced for additional bandwidth for fast
SCell activation.
4. Dormant BWP Operation
- Behavior:
- Dormant BWP is one of the UE’s dedicated BWPs configured
via RRC signaling.
- SpCell and PUCCH SCell cannot be configured with a
dormant BWP.
5. PDCCH Monitoring and BD/CCE Limit Handling
- Scaling Factors:
- Scaling factors are applied for BD/CCE limit computation
during sSCell activation and deactivation.
- Separate scaling factors introduced for PCell and sSCell
configurations.
- Overbooking Handling:
- PDCCH overbooking on sSCell USS sets is not allowed.
6. Clarifications and Corrections
- Capability Description:
- Parameters in CSI-MeasConfig of P(S)Cell and sSCell are
configured to ensure UE capabilities for A-/SP-CSI reporting on PUSCH are
not exceeded.
- DCI Size Alignment:
- Padding zeros are appended to align DCI sizes between
PCell and SCell for CCS.
- Section Naming:
- Corrections made to section naming for CSI-RS tracking
for fast SCell activation.
7. Other Agreements
- Collision Avoidance:
- Discussions on avoiding collisions between temporary RS
and other signaling.
- Stage 2 Description:
- Updates made to TS 38.300 to reflect fast SCell
activation mechanisms.
This summary consolidates the key agreements across various
topics discussed in the document.