# 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.