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Summary of Agreements by Topic

1. Modulation Aspects

• R2D Modulation:
• Maximum M value for OOK-4 modulation is 24.
• Set of M values for PRDCH is {2, 6, 12, 24}.
• CAP uses the same M values set as PRDCH (FFS).
• CP handling for PRDCH supports Method Type 1 for M values ≤ 12. For M values > 12, down-selection between:
• Option 1: Insert padding chips only at the end of OOK chips of OFDM symbol.
• Option 3: No further CP handling design.
• Padding for R2D transmission is required when chips do not fully occupy the last OFDM symbol. Down-selection among:
• Alt 1a: Padding content is up to reader implementation, timeline refers to the end of padding.
• Alt 1b: Padding content is up to reader implementation, timeline refers to the start of padding.
• Alt 2: Specify detailed padding content.
• DFT-s-OFDM Waveform Generation for OOK-4 Modulation:
• Specification includes steps for waveform generation, such as chip representation, DFT/IDFT operations, and subcarrier mapping.
• Normative specification related to steps 1 and 5 is needed.

2. Line Coding, FEC, CRC, and Repetition

• CRC:
• CRC-6 is used for ≤ 24 information bits; CRC-16 is used for > 24 information bits.
• No case in D2R or R2D where CRC is not attached.
• Initial values of the CC encoder shift register are set to the last (K-1) information bits.
• Repetition:
• Block-level repetition for D2R transmission is supported, with repeated blocks transmitted in a single PDRCH.
• Small Frequency Shift:
• Potential values for D2R chip duration (Tchip), bit duration (Tb), and SFS factor (R) are provided for further down-selection.

3. Timing Acquisition and Synchronization

• R-TAS:
• SIP duration is 1 OFDM symbol with CAP pattern ON-OFF-ON-OFF for all M values corresponding to PRDCH.
• Option 1 for CAP of R-TAS is adopted, where CAP duration becomes proportionally shorter with increasing M values.
• D2R Preamble/Midamble:
• Base sequence is generated from m-sequence.
• Long preamble/midamble is based on n=5; short preamble/midamble is based on n=3.
• Reader explicitly indicates the interval between consecutive midambles and between preamble and first midamble via R2D control information.

4. Multiplexing/Multiple Access, Scheduling Information, and Timing Relationships

• Msg1 Transmission:
• Support X=1 and X=2 time domain resources for Msg1 transmissions triggered by one R2D transmission.
• Only X=1 time domain resource is supported for Msg3 transmission.
• Timing Relationships:
• Device is not required to monitor a corresponding R2D transmission earlier than TD2R_min after the end of its D2R transmission.
• Starting time for Msg1 time domain resource is Toffset1 after the end of the corresponding R2D transmission.
• For X=2, starting time for the second Msg1 time domain resource is derived based on the first Msg1 time domain resource plus Toffset2.
• FDMA:
• Support FDMA for multiple Msg1 transmissions with the same data rate for FDMed Msg1 transmissions.
• Payload Size Indication:
• 7 bits are used for byte-level D2R payload size indication.

5. Carrier Waveform Characteristics

• CW Transmission with Large Frequency Shift:
• CW and D2R backscattering can be transmitted in different carriers (e.g., CW in DL spectrum and D2R in UL spectrum).
• No interference from CW to D2R reception at the receiver side.
• Frequency Diversity Gain:
• Observations on frequency diversity gain for CW waveform with frequency hopping are captured, including performance comparisons and diversity gain metrics.

This summary provides a comprehensive overview of the agreements across different topics discussed in the document.