Calculating the maximum downlink data rate in a 5G network involves understanding various parameters and how they interact. Here, we provide a detailed step-by-step guide to calculate the throughput for a given example scenario.

## How to Calculate 5G Throughput?

### Given Parameters.

**Bandwidth (BW)**: 100 MHz**Subcarrier Spacing (SCS)**: 30 kHz**Modulation and Coding Scheme (MCS)**: 256 QAM**Code Rate**: 0.92578125 (948/1024)**Number of MIMO Layers**: 4**Control Channel Overhead**: 14%

### Calculations.

**Symbols per Slot**:

- Given SCS = 30 kHz, each slot duration is 0.5 ms.
- There are 14 OFDM symbols per slot.
- Therefore, in 1 ms, we have 2 slots, resulting in 28 symbols.

**Symbols per Physical Resource Block (PRB)**:

- Each PRB consists of 12 subcarriers.
- Hence, in 1 ms (28 symbols), each PRB contains:

12 subcarriers × 28 symbols = 336 symbols

**Number of PRBs in 100 MHz Bandwidth**:

- Using 30 kHz SCS, the number of PRBs in 100 MHz bandwidth is 273.

**Bits per Symbol for 256 QAM**:

- For 256 QAM, each symbol represents 8 bits.

**Effective Data Symbols (PDSCH Symbols)**:

- Control channel overhead is 14%, so the percentage of symbols used for data (PDSCH) is 86%:

PDSCH Symbols=100%−14%=86%

**Maximum Downlink Data Rate Calculation**:

- The formula for calculating the maximum downlink data rate per millisecond is:

Max DL Data Rate=(No of PRBs) × (No of Symbols per PRB) × (% of PDSCH Symbols) ×(Bits/Symbol) × (Code Rate) × (No of MIMO Layers). - Plugging in the values:
- Max DL Data Rate = 273 × 336 × 0.86 × 8 × 0.92578125 × 4$$$$

- Performing the calculation step-by-step:
- PRBs and symbols: 273×336 = 91728
- Considering PDSCH symbols: 91728×0.86 = 78924.08
- Including bits per symbol: 78924.08×8 = 631392.64
- Applying the code rate: 631392.64 × 0.92578125 = 584434.231
- Accounting for MIMO layers: 584434.231 × 4 = 2337736.924
- Finally, converting to Mbps:

Max DL Data Rate = 2337736.924 bits/ms = 2337Mbps = 2.337Gbps

### Summary

To summarize, the maximum downlink data rate for a 5G network with the given parameters is approximately 2.337 Gbps. This calculation considers bandwidth, subcarrier spacing, modulation scheme, coding rate, MIMO layers, and control channel overhead.

This comprehensive understanding allows network engineers to optimize and ensure the highest possible data rates in a 5G network.

Reference: This article is referenced from Huawei, Ericson, Alcatel Documents.