Feasible TBS Values and Packet Loss Traces for 80ms Bundling Period for ULBC over NB-IoT NTN GEO Channel

1. Background and Scope

This contribution presents simulation results for 80ms bundling period following the Simulation One ("target QoS based simulation") methodology. The document provides:

• Feasible TBS values
• Packet loss traces for optimal configurations
• System capacity analysis

2. Simulation Parameters and Trace Labeling

The simulations cover the following parameter ranges:

• Direction: UL/DL
• TBS: 144, 256, 328, 424 bits (for 80ms bundling)
• Bundling period: 80ms (focus of this paper)
• Doppler spread: 1Hz, 5Hz
• Number of RX: UL: 1, DL: 1, 2
• SCS: UL: 3.75kHz, 15kHz; DL: 15kHz
• Number of tones: UL: 1 for 3.75kHz SCS; 1, 3, 6, 12 for 15kHz SCS; DL: 15
• BLER targets: 1%, 2%, 6%, 10%
• UE power class: 23dBm, 26dBm, 31dBm

Trace file naming convention established for both UL and DL scenarios.

3. Optimal Configurations

3.1 TBS 144, 1 UE RX

Optimality criterion: Tradeoff between per-UE performance (TBS and BLER) and system capacity.

1% BLER

• DL: 16ms NPDSCH (N_SF=4, N_rep=4), required SNR: -4.6dB, capacity: 5 UEs
• UL: 48ms NPUSCH (N_RU=6, SCS 15kHz, 1 tone), required SNR: 0.0dB, UE TX power: 26.4dBm
• Feasibility: Only with 31dBm UE power class

2% BLER

• DL: 12ms NPDSCH (N_SF=3, N_rep=4), required SNR: -4.1dB, capacity: 6 UEs
• UL: 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), required SNR: -2.2dB, UE TX power: 24.2dBm
• Feasibility: 26dBm and 31dBm UE power classes

6% BLER

• DL: 8ms NPDSCH (N_SF=4, N_rep=2), required SNR: -4.0dB, capacity: 10 UEs
• UL: 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), required SNR: -3.2dB, UE TX power: 23.2dBm
• Feasibility: 26dBm and 31dBm UE power classes

10% BLER

• DL: 6ms NPDSCH (N_SF=3, N_rep=2), required SNR: -3.4dB, capacity: 12 UEs (limited by UL)
• UL: 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), required SNR: -3.7dB, UE TX power: 22.7dBm
• Feasibility: All power classes (23dBm, 26dBm, 31dBm)

3.2 TBS 144, 2 UE RX

For 23dBm UE Power Class

• Only 10% BLER achievable with system capacity: 12 UEs
• Uses 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone) and 3ms NPDSCH (N_SF=3, N_rep=1)

For 26dBm and 31dBm UE Power Classes

• 1% BLER: 20 UEs, uses 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 25.6dBm, 4ms NPDSCH
• 2% BLER: 20 UEs, uses 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 25.0dBm, 4ms NPDSCH
• 6% BLER: 20 UEs, uses 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 23.9dBm, 4ms NPDSCH
• 10% BLER: 26 UEs, uses 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 23.4dBm, 3ms NPDSCH

Key observation: 3.75kHz SCS configuration becomes optimal for higher power classes due to better coding rate.

3.3 TBS 256, 2 UE RX

For 26dBm UE Power Class

• 10% BLER: 12 UEs, 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), UE TX power: 24.8dBm
• 6% BLER: 12 UEs, 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), UE TX power: 25.3dBm
• 2% and 1% BLER: Infeasible

For 31dBm UE Power Class

• 10% BLER: 16 UEs, 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 27.2dBm, 5ms NPDSCH
• 6% BLER: 16 UEs, 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 27.8dBm, 5ms NPDSCH
• 2% BLER: 10 UEs, 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), UE TX power: 26.3dBm, 8ms NPDSCH
• 1% BLER: 10 UEs, 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), UE TX power: 26.8dBm, 8ms NPDSCH

3.4 TBS 328, 2 UE RX

For 26dBm UE Power Class

• Only 10% BLER achievable: 12 UEs, 64ms NPUSCH (N_RU=8, SCS 15kHz, 1 tone), UE TX power: 25.88dBm

For 31dBm UE Power Class

• 10% BLER: 13 UEs, 64ms NPUSCH (N_RU=2, SCS 3.75kHz, 1 tone), UE TX power: 30.5dBm, 6ms NPDSCH
• 6% BLER: 10 UEs, 64ms NPUSCH (N_RU=4, N_rep=2, SCS 15kHz, 1 tone), UE TX power: 26.4dBm, 8ms NPDSCH
• 2% BLER: 10 UEs, 64ms NPUSCH (N_RU=4, N_rep=2, SCS 15kHz, 1 tone), UE TX power: 27.5dBm, 8ms NPDSCH
• 1% BLER: 8 UEs, 64ms NPUSCH (N_RU=4, N_rep=2, SCS 15kHz, 1 tone), UE TX power: 28.1dBm, 10ms NPDSCH

3.5 TBS 424, 2 UE RX

Note: Coarse 5ms granularity for NPDSCH time-domain configuration.

For 31dBm UE Power Class

• 10% BLER: 4 UEs, 40ms NPUSCH (N_RU=5, SCS 15kHz, 3 tones), UE TX power: 29.10dBm, 10ms NPDSCH
• 6% BLER: 4 UEs, 40ms NPUSCH (N_RU=5, SCS 15kHz, 3 tones), UE TX power: 29.73dBm, 10ms NPDSCH
• 2% BLER: 4 UEs, 40ms NPUSCH (N_RU=5, SCS 15kHz, 3 tones), UE TX power: 30.96dBm, 10ms NPDSCH
• 1% BLER: Infeasible

4. Feasible TBS Values

Observation: For 80ms bundling period with UE power class up to 31dBm:
- All TBS values (144, 256, 328, 424) are feasible for BLERs 1%, 2%, 6%, and 10%
- Exception: TBS 424 is not feasible at 1% BLER

5. Packet Loss Traces

299,391 traces provided in attached zip file for all 4 TBS values (144, 256, 328, 424).

6. Proposal

Proposal: Include clauses 2 through 5 to the PD or TR to provide a workable example on determining configurations based on optimal tradeoff between per-UE performance and system capacity.