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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.
slide10
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