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Extensive Summary of Agreements by Topic
Side Control Information
- Beam Information:
- Beam information is recommended as side control
information to improve NCR performance.
- Both fixed and adaptive beams can be considered for
C-link and backhaul link.
- Beam correspondence is assumed for DL/UL of access link
and backhaul link.
- For FR2, beam indication is beneficial for controlling
NCR behavior; no evaluation results for FR1 yet.
- ON-OFF Information:
- ON-OFF information is beneficial for energy efficiency
and interference management.
- NCR-Fwd is expected to be "OFF" unless
explicitly or implicitly indicated by gNB.
- For FR2, ON state is indicated implicitly via beam
indication; for FR1, ON state is indicated via beam indication.
- Timing Alignment:
- NCR-Fwd’s DL/UL timing aligns with NCR-MT’s DL/UL frame
timing.
- Internal delay impacts timing relationships between DL/UL
transmission and reception.
- TDD UL/DL Configuration:
- Semi-static TDD UL/DL configuration is needed for C-link,
backhaul link, and access link.
- Same TDD UL/DL configuration is assumed for all links if
NCR-MT and NCR-Fwd operate in the same frequency band.
- Power Control:
- Power control information is applicable for UL and DL
forwarding links.
- Dynamic repeater gain/power control provides additional
SINR gain over semi-static configurations.
Signaling for Side Control Information
- L1/L2 Signaling:
- Dynamic and granular (symbol-level) side control
information indication is supported.
- Both L1 (DCI-based) and L2/L3 (MAC-CE or RRC-based)
signaling are considered for semi-static/periodic signals.
- Aperiodic beam indication is supported via DCI format
2_8.
- Priority Handling:
- Priority order for beam indications: Aperiodic >
Semi-persistent > Periodic.
- No conflict is expected between periodic or
semi-persistent indications.
- Beam Indication Granularity:
- Both slot-level and symbol-level granularity are
recommended for time-domain resource indication.
- Semi-static and dynamic beam indications are supported.
- Configuration Parameters:
- Maximum number of periodic beam indications: 32.
- Maximum supported number of beams: 64.
- Maximum number of symbols for time resource duration:
112.
NCR Behavior
- Forwarding Behavior:
- NCR-Fwd does not perform forwarding in "OFF"
state.
- Default behavior for flexible symbols is "OFF"
unless dynamic DL/UL operation is supported.
- Beam Failure Recovery:
- NCR-Fwd is OFF until beam failure recovery is completed
in C-link.
- Simultaneous Transmission:
- No specification impact for power sharing across NCR-MT
and NCR-Fwd for simultaneous UL transmission.
Other Aspects
- Control Plane Signaling:
- Legacy Rel-15 initial/random access procedures are
supported for NCR-MTs in C-link.
- HARQ-ACK feedback for PDSCH carrying side control
information is supported using legacy mechanisms.
- Sounding Procedures:
- Legacy UE sounding procedures are supported for NCR-MT in
C-link.
- Beam Correspondence:
- Backhaul link beam follows the last MAC CE before BWP
switching until a new MAC CE is received.
- Abbreviations:
- NCR abbreviation added to specifications for clarity.
- Cyclic Prefix:
- Time resource configuration for access link assumes the
cyclic prefix of the active BWP.
Maintenance
- Specification Alignment:
- Parameter names aligned across TS 38.213 and TS 38.306.
- Clarifications added for SCS and cyclic prefix
assumptions.
- Remaining Issues:
- No enhancement on DCI size for DCI 2_8; gNB ensures
"DCI size budget."
- No conflict expected on AP-beam indication over
overlapped time resources in a single DCI.
This summary captures the key agreements across topics
related to NR network-controlled repeaters in Rel-18.