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Summary of Agreements by Topic

9.9.1 NR PDCCH Reception in Symbols with LTE CRS REs

1. General Agreements:
• Reception of NR PDCCH candidates overlapping with LTE CRS REs is supported by Rel-18 UEs.
• PDCCH candidates and PDCCH-DMRS RE mapping are based on Rel-15 assumptions from the UE side.
• Channel estimation options include:
• Legacy CE assumption.
• CE on clean symbols only (not applicable for 1-symbol CORESET).
• Restriction on symbols and/or LTE CRS patterns can be considered during UE capability sessions.
• Agreements apply to 15 kHz SCS only.
2. Evaluation Options:
• Option 1-1: Legacy PDCCH mapping with receiver puncturing overlapping REs.
• Option 1-2: New PDCCH rate-matching with no DMRS on overlapping symbols.
• Option 2: Legacy mapping with baseline processing or advanced receiver options.
3. Simulation Assumptions:
• LLS Simulations: Parameters include carrier frequency (2 GHz), bandwidth (20 MHz), channel model (TDL-C 300), and UE speed (30 kmph).
• SLS Simulations: Parameters include carrier frequency (2.1 GHz), bandwidth (20 MHz), BS antenna height (25 m), UE height (1.5 m), and urban macro scenario.
4. Adopted Text Proposals:
• Updates to TS 38.211 and TS 38.213 regarding CORESET resource mapping and UE procedures for PDCCH assignment.

9.9.2 UE Support for Two Overlapping CRS Rate Matching Patterns

1. General Agreements:
• Introduce two new RRC parameters: lte-CRS-PatternList3-r18 and lte-CRS-PatternList4-r18.
• These parameters are applicable to 15 kHz SCS PDSCH only.
• Network cannot configure legacy lists (lte-CRS-PatternList1-r16 and lte-CRS-PatternList2-r16) simultaneously with the new lists.
• Overlapping CRS patterns are fully aligned in frequency between lte-CRS-PatternList3-r18 and lte-CRS-PatternList4-r18.
2. Working Assumptions:
• UE applies lte-CRS-PatternList3-r18 and lte-CRS-PatternList4-r18 for rate matching when configured.
• If two CORESET pools are configured, rate matching depends on coresetPoolIndex.
3. Agreements on UE Capability:
• Introduce new UE capabilities for supporting two overlapping LTE CRS patterns.
• Rel-16 UE capability overlapRateMatchingEUTRA-CRS-r16 is subject to support of multi-DCI-Multi-TRP-r16.

Maintenance on Enhancement of NR Dynamic Spectrum Sharing (DSS)

1. NR PDCCH Reception in Symbols with LTE CRS REs:
• Maintenance contributions focused on resolving remaining issues for PDCCH reception overlapping with LTE CRS.
• Monitoring of PDCCH candidates overlapping with LTE CRS was discussed.
2. UE Support for Two Overlapping CRS Rate Matching Patterns:
• No new contributions were made during maintenance sessions.

Other Agreements

1. Simulation Parameters:
• Companies to report details on channel estimation, power ratios, and other implementation assumptions.
• Traffic geometry is full buffer, and KPIs include PDCCH capacity, coverage, and coexistence with legacy UEs.
2. Email Discussions:
• Email discussions were arranged for clarifying evaluation assumptions, sharing implementation details, and collecting results.

This summary consolidates the agreements across sessions and topics related to NR Dynamic Spectrum Sharing (DSS) enhancements in Rel-18.