> For the complete documentation index, see [llms.txt](https://jen-hsuan-hsieh.gitbook.io/protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jen-hsuan-hsieh.gitbook.io/protocol/chapter5-wireless-network/54lte/544whats-lte-different.md).

# 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.&#x20;
  * 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