5.4.4.What's LTE different?

• 1.LTE Salient Features/ Targets

  • 1.high data rates

    • DL > 100 Mbps (support MIMO)

    • UL > 50 Mbps

  • 2.Low delay/ latency

    • delay < 10 ms

    • latency < 100ms

  • 3.High spectral efficiency

  • 4.Spectrum flexibility

    • 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz, Can be deployed in FDD and HDD.

  • 5.Cell edge data rates

    • 2-3 * HSPA

  • 6.Focus on services from the packet switched domain

  • 7.State of the art towards 4G

• 2.How is EPS different thsn other technology architectures?

  • 1.比WCDMA少了RNC (Radio Network Controller)

  • 2.WCDMA的GGSN, SGSN在LTE中以P/S-GW來取代, node變少, latency降低

  • 3.LTE的eNodeB可以互相溝通, WCDMA的不行: optimized performance and cost efficiency