From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about the mobile telecommunications standard. For other uses, see 4G (disambiguation).
| It has been suggested that 4g wifi be merged into this article or section. (Discuss) Proposed since October 2012.
| This article may be too technical for most readers to understand. Please help improve this article to make it understandable to non-experts, without removing the technical details. The talk page may contain suggestions. (December 2011)
| In telecommunications, 4G is the fourth generation of mobile phone mobile communications standards. It is a successor of the third generation (3G) standards. A 4G system provides mobile ultra-broadband Internet access, for example to laptops with USB wireless modems, to smartphones, and to other mobile devices. Conceivable applications include amended mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing and 3D television. Two 4G candidate systems are commercially deployed: the Mobile WiMAX standard (at first in South Korea in 2006), and the first-release Long Term Evolution (LTE) standard (in Scandinavia since 2009). It has however been debated if these first-release versions should be considered to be 4G or not, as discussed in the technical definition section below. In the U.S. Sprint Nextel has deployed Mobile WiMAX networks since 2008, and MetroPCS was the first operator to offer LTE service in 2010. USB wireless modems have been available since the start, while WiMAX smartphones have been available since 2010, and LTE smartphones since 2011. Equipment made for different continents are not always compatible, because of different frequency bands. Mobile WiMAX are currently (April 2012) not available for the European market. In Australia, Telstra launched the country's first 4G network (LTE) in September 2011 claiming "2–40 Mbps" speeds and announced an "aggressive" expansion of that network in 2012. In India, Bharti Airtel has launched India's first 4G service using TD-LTE technology in Kolkata on 10 April 2012. In New Zealand the first 4G network will be introduced in December 2013. Contents[hide] * 1 Technical definition * 2 Background * 3 IMT-Advanced requirements * 4 System standards * 4.1 IMT-2000 compliant 4G standards * 4.1.1 LTE Advanced * 4.1.2 IEEE 802.16m or WirelessMAN-Advanced * 4.2 Forerunner versions * 4.2.1 3GPP Long Term Evolution (LTE) * 4.2.2 Mobile WiMAX (IEEE 802.16e) * 4.2.3 TD-LTE for China market * 4.3 Discontinued candidate systems * 4.3.1 UMB (formerly EV-DO Rev. C) * 4.3.2 Flash-OFDM * 4.3.3 iBurst and MBWA (IEEE 802.20) systems * 5 Data rate comparison * 6 Principal technologies in all candidate systems * 6.1 Key features * 6.2 Multiplexing and access schemes * 6.3 IPv6 support * 6.4 Advanced antenna systems * 6.5 Open-wireless Architecture and Software-defined radio (SDR) * 7 History of 4G and pre-4G technologies * 7.1 Deployment plans * 7.1.1 Africa * 7.1.2 Australia * 7.1.3 Belgium * 7.1.4 Brazil * 7.1.5 Canada * 7.1.6 France * 7.1.7 India * 7.1.8 Middle East * 7.1.9 Romania * 7.1.10 Scandinavia * 7.1.11 South Korea * 7.1.12 Sri Lanka * 7.1.13 United Kingdom & Ireland * 7.1.14 United States * 7.1.15 Others * 8 Beyond 4G research * 9 See also * 10 References * 11 External links
| Technical definition
In March 2008, the International Telecommunications Union-Radio communications sector (ITU-R) specified a set of requirements for 4G standards, named the International Mobile Telecommunications Advanced (IMT-Advanced) specification, setting peak speed requirements for 4G service at 100 megabits per second (Mbit/s) for high mobility communication (such as from...
Please join StudyMode to read the full document