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Extensive Summary of Agreements by Topic for Rel-19 LTE-based 5G Broadcast Phase 2

Time and Frequency Interleaving

1. Time Interleaving Depth:
• Supported values: M={4,8,16,32} and N={1,2,4,8,16}.
• FFS: Larger values, including M=64 and N={32,64}.
• UE behavior to be specified for cases where M and N exceed UE capabilities (e.g., soft buffer size, maximum TBS supportable in a TTI).
2. Configuration Options for Time Interleaving Transmission:
• Option 1: Per MBSFN area/MCCH configuration (via mcch-Config).
• Option 2: Per PMCH configuration (via pmch-Config).
• Option 3: Per MBMS session (via MBMS-SessionInfo or MAC CE).
• Updated agreement: If per MBMS session configuration is done:
• Alt1: A T_proc of 3 ms between the end of MSI and the first MTCH in the MCH scheduling period is needed for UE de-rate matching.
• Alt2: Other options are not precluded, allowing UE to know M, N values of the first MTCH scheduled after MSI.
3. Basic Transmission Pattern:
• PMCH with time interleaving consists of (M x N) consecutive MBSFN subframes, excluding MCCH and MSI.
• Two transmissions of the same TB are separated by (M-1) MBSFN subframes.
4. Handling MSI Periodicity Mismatch:
• Adopt extended configurable periodicities for MCH scheduling to reduce resource wastage.
• Options for residual mismatch:
• Option 1: Drop time-interleaved TBs without all N RVs transmitted within MSI periodicity.
• Option 2: Drop time-interleaved TBs that could not be successfully decoded.
• Network decides whether to schedule MTCH transmission in residual mismatch parts of MSI periodicity.

Transport Block Size (TBS) Scaling

1. Scaling by N:
• Two options for calculating final TBS:
• Option 1: Use transport block size table in TS 36.213, calculate TBS based on system bandwidth, and round to the closest TBS value.
• Option 2: Obtain initial TBS as per current specifications and calculate final TBS as TBS = round{TBS' × N}.
• Clarification: If two TBS values are equidistant, the larger TBS is chosen.
2. Maximum TBS for PMCH:
• Derived based on DL-SCH as per TS 36.306 set by UE category.
• Includes scaled-up broadcast bits by N.

Frequency Interleaving

1. Granularity:
• Granularity of frequency interleaver is 1 RE.
2. Design Principles:
• Modulation symbol vector interleaved according to TS 36.212.
• Number of columns (X) options:
• Option 1: X equals the number of codeblocks mapped to the OFDM symbol.
• Option 2: X=32.
• Other options not precluded.
• Matrix operations:
• Write elements column-wise into a matrix.
• Read elements row-wise, excluding padding.
• Map vector to resource elements as per TS 36.211.
3. Row Operations:
• Inter-row permutation with reordered row indexes.
• Cyclic shift applied to elements in each row with defined offset.

LBRM Parameters

1. Consistency:
• LBRM parameters (e.g., NIR, NCB) are consistent between broadcast network and multiple UEs receiving the transmission.
• FFS: How consistent NIR and NCB are calculated for UEs of different categories.

Higher Layer Signaling

1. Initial Input:
• Rapporteur to provide input on higher layer signaling under agenda item 9.13.
• Other inputs to be included in relevant sub-agenda items.

Evaluation Guidance

1. Channel Profile:
• Use "Two Path Ensemble" channel profile defined in Table A.1.1, Annex A of A325-2024-04 for frequency interleaver evaluation.
• Delay to be selected by proponents but less than 0.95*CP.

This summary consolidates agreements across sessions and topics for Rel-19 LTE-based 5G Broadcast Phase 2.