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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.

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LTE Introduction

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  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

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