4G refers to the fourth generation of cellular wireless standards. It is a successor to 3G and 2G standards. The nomenclature of the generations generally refers to a change in the fundamental nature of the service. The first was the move from analogue to digital (2G), which was followed by multi-media support (3G) and now 4G, which refers to all IP packet switched networks and increases in data speeds.
A 4G system is expected to provide a comprehensive and secure all-IP based solution where facilities such as IP telephony, ultra-broadband Internet access, gaming services and streamed multimedia may be provided to users.
4G is being developed to accommodate the QoS and rate requirements set by further development of existing 3G applications like wireless broadband access, Multimedia Messaging Service (MMS), video chat, mobile TV, but also new services like HDTV content, minimal services like voice and data, and other services that utilize bandwidth. It may be allowed roaming with wireless local area networks, and be combined with digital video broadcasting systems.
Some Features:
- No CDMA
- An all IP, packet switched network
- Interoperability with existing wireless standards
- A data rate of at least 100 Mbit/s between any two points in the world
- Flexible channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz
- IPv6 Support
- Advanced Antenna Systems
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