Difference between 3G and 4G?
Major requirement driving architecture | 3G (Including 2.5G, Sub3G) | 4G |
| | Predominantly voice driven; data was always add on | Converged data and voice over IP |
| Network Architecture | Wide area cell-based | Hybrid: Integration of wireless LAN (WiFi, Bluetooth) and wide area |
| Speeds | 384 Kbps to 2 Mbps | 20 to 100 Mbps in mobile mode |
| Frequency Band | Dependent on country or continent (1800‐2400 MHz) | Higher frequency bands (2-8 GHz) |
| Bandwidth | 5-20 MHz | 100 MHz (or more) |
| Switching Design Basis | Circuit and Packet | All digital with packetized voice |
| Access Technologies | W-CDMA, 1xRTT, Edge | OFDM and MC-CDMA (Multi Carrier CDMA) |
| Forward Error Correction | Convolutional rate 1/2, 1/3 | Concatenated coding scheme |
| Component Design | Optimized antenna design, multi-band adapters | Smarter Antennas, software multiband and wideband radios |
| IP | A number of air link protocols, including IP 5.0 | All IP (IPv6) |
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