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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

LTE Introduction

0056532 Tzu-chin Liu

15th March 2012


Outline
Outline

  • Overview

  • Network architecture

  • Protocol stack

  • Resource element

  • Frame structure

    • TDD frame configuration

    • TDD special subframe

  • MIMO

  • Random access procedure


Lte overview
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



Protocol stack
Protocol Stack

  • User plane:

  • Control plane:


Resource element
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.


Lte frame structure
LTE Frame Structure

  • One radio frame has 10 ms:

    • 10 subframes, each of 1 ms.

  • Duplexing:

    • FDD

    • TDD


Lte tdd frame
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.



MIMO

  • Multiple-Input Multiple-Output:

    • multiple antennas at both the transmitter and receiver to improve communication performance.

  • Better throughput

  • Longer transmission distance


Mimo modes
MIMO modes

  • Downlink Transmission Mode:

    • Release 8 have defined 7 transmission modes.


Random access procedure
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




References
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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