Table 8 Existing QoS class categorization for M2M communications [118, 142, 169]
From: Mobile M2M communication architectures, upcoming challenges, applications, and future directions
| Parameters | Class 0 | Class 1 | Class 2 | Class 3 | Class 4 |
|---|---|---|---|---|---|
| Use cases | e-healthcare, | Mobile POS | Intelligent | Smart homes, | Metering, |
| emergency | (point of sale) | transportation, | security | monitoring | |
| alerting | streaming, | ||||
| Traffic types | Random, | Random, | Random | Random | Regular |
| real time | real time | ||||
| Priority | Strict, high | Low-1 | Low-2 | Low-3 | Low-3 |
| Data size in bytes | Small | Small | Small | Small/medium | Large |
| Inter-send time | Seconds | Seconds | Minute | Minute | Seconds |
| ↓ | ↓ | ||||
| hours | hours | ||||
| Mobility | Low | Low | Low | No | Low |
| ↓ | |||||
| high | |||||
| Delay budget | Milliseconds | Milliseconds | Milliseconds | Minute | Seconds |
| ↓ | ↓ | ||||
| [approx. 125 ms] | minute | hours |