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Basics of LTE (Long Term Evolution)

February 11, 2010

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LTE is the new standard of the 3GPP for the next generation of mobile telecommunications; It is the evolution of GSM/WCDMA. The key features of LTE are:

  • OFDM in Download link, DFTS-OFDM (“Single-Carrier FDMA”) in Uplink.
  • IP flat architecture with the SAE architecture.
  • Low latency (10ms for User-plane, 100ms for Control-plane).
  • MIMO antennas.
  • Building on current investments in the GSM/UMTS.
  • Flexible carrier bandwidths: 1.4MHz -20MHz.  (1.4, 3, 5, 10, 15 and 20 MHz).
  • FDD – TDD.
  • LTE can do handover and roaming to existing networks.
  • DL-peak: max 326,4 Mbit/s with 4×4 antennas, 172,8 Mbit/s with 2×2 antennas.
  • UL-peak: Max 86,4 Mbit/s.
  • Up to 200 users at the same time in a 5 MHz cell.
  • Average optimum cell distance 5km. Cell of 30km still works good, with a little degradation. Cell of 100km is still acceptable.
  • Increased spectrum flexibility, It supports spectrum slices of 1.5 MHz (up to 20 MHz).
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Categories: 3G, 4G, LTE Tags: , ,
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