4G stands for the fourth generation of cellular wireless standards.
It is a successor to 3G and 2G families of standards.
Fourth generation mobile communications systems that are characterized by high-speed data rates at 20 to 100 Mbps
Objectives of 4G Technology:
- 4G is being developed to accommodate the QoS
- Mobile broadband access
- Video chat
- Mobile TV like HDTV
- Digital video broadcasting
- A data rate of at least 100 Mbit/s
- Smooth hand off across heterogeneous networks
- An all IP, packet switched network.
ITU Requirement And 4G Technology:
- Based on an all-IP packet switched network.
- Peak data rates of up to approximately 100 Mbit/s
- Scalable channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz
- 802.16m standardized by the IEEE (i.e. WiMAX)
- LTE Advanced standardized by the 3GPP
Principles of Technology:
- Turbo principle error-correcting codes
- Channel-dependent scheduling
- IP V6
Data Rates Table:
4G Candidate Systems:
- LTE Advanced
- IEEE 802.16m or WirelessMAN-Advanced
- 3GPP Long Term Evolution (LTE)
- Mobile WiMAX (IEEE 802.16e)
- UMB (formerly EV-DO Rev. C)
- iBurst and MBWA (IEEE 802.20) systems
3G Vs 4G:
- Predominantly voice driven – data was always add on
- Wide area cell-based
- 1800-2400 MHz
- Circuit and packet switched networks.
- Combination of existing & evolved equipment.
- Data rate (up to 2Mbps).
- Optimized antenna design, multi-band adapters
- A number of air link protocols, including IP
- Converged data and voice over IP
- Hybrid – Integration of Wireless LAN (WiFi, Bluetooth) and wide area.
- Higher frequency bands 2-8 GHz
- Entirely packet switched networks.
- All network elements are digital.
- Higher bandwidth (up to 100Mbps).
- Smarter Antennas, software multi-band and wide band radios
- All IP (IPv6.0)
- High usability: anytime, anywhere, and with any technology
- Support for multimedia services at low transmission cost
- Integrated services