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LTE has been all over the news this year - Reliance Industries (RIL) looks set to deploy TD-LTE services in 2011 in India, WiMax v/s LTE, The Indian government have approved Qualcomm’s investment in four fixed broadband services that will use LTE... Let us try to understand what LTE is all about. Long Term Evolution (LTE), is a new radio platform that is the primary technology behind 4G – the evolution of 3G networks. Where 3G made mobile data a reality, 4G will make it a much better one. It has been in development for around 10 years now, and has begun to see some releases worldwide. The very first LTE network was launched by TeliaSonera in Norway and Sweden, Verizon launched their LTE service in 38 markets in late 2010. Elsewhere the network is still at the trial stage. Boiled down to it’s basics, here is what LTE does: Theoretical download peak data rates up to 100 Mbps and upload peak data rates up to 50 Mbps with 20 MHz bandwidth Reduced latency to 10 msec round-trip time between user equipment and base station More capacity than 3G – an LTE network can support more users in a single area Larger cell size. A single LTE cell tower can cover up to 100km. While that size will be greatly diminished in a heavy urban area, it’s still a lot better than 3G Compatability - LTE is designed to be compatible with existing standards Ease of upgrade - Part of the reason it has taken so long to develop LTE is that it is planning forward a lot. The networks are being designed so that implementing upgrades further down the line will be much easier. TD-LTE has been gathering steam over the last few months, and now a lot of operators are experimenting with it. It stands for Time Division LTE, and was developed by China Mobile over the last three years. To keep this as simple as possible, here are the essential differences and similarities between TD-LTE and classic LTE: They run on different bands of the wireless spectrum. But the part of the spectrum that would carry the TD-LTE signal is much cheaper, and has much less traffic. TD-LTE and LTE are so similar that the same chip can access both networks – which is much easier for handset manufacturers. The other standard for 4G, WiMAX, is not particularly compatible with LTE. There’s talk that it WILL be compatible in the future, but it’s not at the moment. TD-LTE, however, can be pretty cheaply and easily upgraded to from WiMAX. A novel radio access technology is implemented by LTE, which bodes well for IP-based traffic largely. Another advantage of this technology is its offering an uncomplicated upgrading track from existing 3G networks. A mobile networks core architecture also may evolve from LTE that would be known as System Architecture Evolution, which can effectuate significant perormance augmentations over 3G. This technology, further can enhance spectral efficiency with double the efficacy of 3G and HSPA standards. The numerous wireless broadband networks of the times can exploit the higher data speeds and capacity evolved here, as good as any other media application. Other significant advantages presented by this technology are - cost reduction per bit, services increment at low costs, Usage flexibility of new, as well as existing frequency bands, open interfaces, simple architecture, and a considerable reduction in terminal power consumption. LTE can co-exist with earlier 3GPP radio technologies, even in adjacent channels, and calls can be handed over to and from all 3GPP’s previous radio access technologies. What is LTE architecture? The evolved architecture comprises E-UTRAN (Evolved UTRAN) on the access side and EPC (Evolved Packet Core) on the core side. The figure below shows the evolved system architecture More technical info here Since it is a evolving technology, experts are requested to give their opinion and the post will be modified accordingly To see the latest LTE deployments and commitments check LTE Maps Sourced info from missphones, gomonews