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Summary of Agreements by Topic: Enabling TX/RX for XR
During RRM Measurements
General Agreements
- Dynamic Indication (Alt. 1-1):
- Explicit indication by DCI to skip a particular
gap/restriction.
- Indication is included as part of scheduling DCI with a
bit-field size of one bit.
- The bit in the DCI indicates whether to skip the first
gap/restriction occasion after a minimum time offset between the last
symbol of the PDCCH carrying the DCI format and the start of the skipped
gap/restriction occasion.
- Semi-Static Solution (Alt. 3-1):
- Configure patterns via RRC to indicate occasions where
gaps/restrictions can be skipped.
- Patterns can be based on periodicity, offset, duration,
or bitmap.
- UE Assistance Information:
- No consensus to support UE assistance information related
to measurement occasions, channel conditions, traffic, or UE mobility.
- RAN1 defers further work on UE assistance information to
other working groups.
Explicit Indication by DCI
- Bit Value Interpretation:
- Bit value "1" indicates the corresponding
gap/restriction occasion is to be skipped.
- Two options for bit value "0":
- Option 1: UE ignores the indication of this field in the
DCI.
- Option 2: UE behavior for the corresponding
gap/restriction occasion is as per legacy behavior.
- DCI Formats:
- Explicit indication can be included in DCI formats
0_1/1_1, 0_2/1_2, and 0_3/1_3.
- Skipping indication corresponds to the first
gap/restriction occasion among co-scheduled cells by the DCI (Type-1C
field).
- Applies only for intra-band CA cases (same SCS for cells
in the set of co-scheduled cells).
- Cross-Carrier Scheduling:
- For explicit indication by DCI to skip a particular
gap/restriction, one bit indication corresponds to a scheduled cell.
- If CIF field is present, the scheduled cell for the
skipping indication is determined by CIF field.
- If CIF field is not present, the scheduled cell for the
skipping indication is the scheduling cell.
Measurement Gap/Restriction Handling
- Skipping Measurement Gaps:
- If a measurement gap/restriction is indicated to be
skipped by explicit indication by DCI, TX/RX is enabled on all serving
cells in the applicable range of the skipped measurement gap/restriction.
- Applicable range is based on RAN4 specifications.
- Partial Cancellation:
- From RAN1 perspective, partial cancellation/skipping of
occasions of gaps/restrictions caused by RRM measurements is not
supported in Release 19.
Higher Layer Signaling
- Configuration of Skipping Indication:
- Explicit indication can be configured for each DCI format
individually by higher layer.
- If skipping field is configured to DCI format 0_3/1_3,
only intra-band cells with the same SCS can be co-scheduled.
- Impact on RRM Performance:
- RAN4 to consider the impact of skipping measurement
occasions on RRM performance.
Final Notes
- Agreements are subject to further refinement and
validation by RAN4 and other working groups.
- RAN1 continues to focus on solutions agnostic to types of
gaps/restrictions caused by RRM measurements.