1 / 15

LTE Introduction

LTE Introduction. 0056532 Tzu-chin Liu 15 th March 2012. Outline . Overview Network architecture Protocol stack Resource element Frame structure TDD frame configuration TDD special subframe MIMO Random access procedure. LTE Overview.

allie
Download Presentation

LTE Introduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. LTE Introduction 0056532 Tzu-chin Liu 15th March 2012

  2. Outline • Overview • Network architecture • Protocol stack • Resource element • Frame structure • TDD frame configuration • TDD special subframe • MIMO • Random access procedure

  3. LTE Overview • LTE – Long Term Evolution: The 4th generation telecommunication standards. • Evolved from the 3GPP system.(R8) • RAN: LTE • Core: SAE(System Architecture Evolution) • Characteristics: • Packet switching • All – IP network • Higher data rate • OFDMA based • MIMO supported

  4. SAE – System Architecture Evolution

  5. Protocol Stack • User plane: • Control plane:

  6. Resource element • The basic unit when allocating carrier resource. • Resource Element(RE): • One subcarrier by one symbol • Resource Block(RB): • 12 subcarriers by 7 symbol • Resource Element Group(REG): • For control plane • One REG has 4 or 6 REs.

  7. LTE Frame Structure • One radio frame has 10 ms: • 10 subframes, each of 1 ms. • Duplexing: • FDD • TDD

  8. LTE TDD Frame • UL-DL configuration: • LTE TDD can have 7 UL-DL subframe configurations. • Special Subframe: • Provide a gap to allow switching from DL to UL a transition subframe.

  9. LTE TDD UL-DL configuration

  10. MIMO • Multiple-Input Multiple-Output: • multiple antennas at both the transmitter and receiver to improve communication performance. • Better throughput • Longer transmission distance

  11. MIMO modes • Downlink Transmission Mode: • Release 8 have defined 7 transmission modes.

  12. Random Access Procedure • Random access purpose: Set up the RRC (Radio Resource Control) connection when: • Idle state or initial power on • Handover • Synchronization • Reset RRC

  13. Random Access Procedure

  14. Q & A

  15. References • TDD LTE Air Interfaces v.1 • TS 33.401 3GPP System Architecture Evolution (SAE): Security architecture • TS 36.213 Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures • TS 36.321 Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification

More Related