4G and LTE Advanced are upcoming technologies of new generation. 4G is technology similar to 3G but, simultaneously, more enhanced and improved in nature. The LTE is another technology that comes with the 4G technology. LTE stands for Long Term Evolution. Frequently, it is referred to as 4G; however, it’s just a pre-4G technology 3GPP. The first version of LTE wasn’t able to completely fulfill the requirements of IMT-Advanced (International Mobile Telecommunication). It is just a hypothesis that, when a channel of 20 MHz is utilized then the net bitrate size of LTE will be up to 50Mbits in uplink and 100Mbits in downlink. This bitrate size will be improved if the antenna arrays (MIMO) are utilized. Many well-known mobile carriers, like AT&T and Verizon Wireless, around the world are considering changing their networks into LTE. On 14 December 2009, LTE service, labeled as 4G, was commenced officially in Scandinavian capitals Oslo and Stockholm. HSOPA, High Speed OFDM Packet Access, was the name given to the physical radio interface in its early stage. However, it is now called as E-UTRA, UMTS Terrestrial Radio Access, which is the advanced form of HSOPA.
The Advanced LTE is perfectly suited for the standard of IMT Advanced which will be released in 2011. This technology was previously coming under ITU-T. The purpose of this technology is to go beyond the requirements of ITU. This technology, LTE Advanced, is supposed to allocate the frequency band and to be well-suited with the first release of LTE equipment.