Source : http://vernonchan.com/2010/11/ytl-comms-ye...-preview-event/
The true definition of 4G has been, thus far, been sketchy and highly muddled. In layman terms, 4G is simply defined as the fourth generation of the cellular wireless standard, superseding 3G and 2G. 4G is a fully IP-packet switched network solution which facilitates ultra high-speed broadband, IP telephony, seamless connectivity, global roaming across multiple networks and next generation multimedia support (IPTV, streaming video, rich media, etc). International Telecommunications Union-Radiocommunication Sector (ITU-R)‘s 4G requirements specifies target peak data rates of approximately 100Mbps for mobile access and 1Gbps for stationary or low mobility access.
There has been two clear players/standards – both which are considered pre-4G technologies (because they do not fully comply with IMT-Advanced requirements). Globally, this hasn’t stopped telcos from branding their offerings as 4G. Firstly, there is 3GPP LTE (Long Term Evolution). Theoretically, LTE has downlink speeds of up to 100Mbps and 50Mbps uplink if a 20Mhz channel is used. LTE, if you didn’t know already, has been field-tested by Maxis in Damansara and Bandar Utama areas since July this year. The tests revealed impressive speeds of 60-104Mbps, utilising both 10Mhz and 20Mhz bandwidth channels. How fast is that? How about downloading a full length 640Mb movie in a minute? The world’s first LTE networks were deployed in Stockholm and Oslo in 2009.
Next is Mobile WiMAX (IEEE 802.16e standard), which first made its debut in South Korea in 2006 (called WiBro). US-based Sprint Nextel started using Mobile WiMAX in 2008, also branding it 4G. Data speeds peaked at 128Mbps on downlink and 56Mbps on uplink via 20Hz channels.
Will the real 4G please stand up?
Just a month ago, the ITU accorded two technologies namely LTE-Advanced and WirelessMAN-Advanced2 or WiMAX 2 (IEEE 802.16m) the designation of IMT-Advanced (formal name for 4G), officially qualifying them as true 4G technologies. As it stands, existing 4G networks are not 4G, not for a long shot. But here’s the thing, LTE-Advanced and WiMAX 2 will not be coming anytime soon. Not in some years at least. Strictly from a branding standpoint, it makes sense for telcos to ride on the 4G moniker. For one, it is easier for consumers to relate to and differentiate from the old. Next, because technically speaking, LTE/WiMAX are indeed new generation technologies (however short they fall off ITU specifications) and are definite steps up from voice-centric 3G (UMTS — CDMA — HSPA/HSPA+) which are available currently.
Samsung GALAXY S II Official thread V1, Reviews/FAQ/Tips/Accessories/Apps
Mar 5 2011, 11:26 PM
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