Network & Protocols
  • Introduction
  • Chapter1: protocol for industrial
    • 1.1.modbus
  • Chapter2: Protocol for IOT
    • 2.1.MQTT
      • 2.1.1.Introduction: What is MQTT?
      • 2.1.2.Install mosquitto on Windows 7
      • 2.1.3.Install M2Mqtt by Nuget, Example code
  • Chapter3: Protocol for network
    • 3.1.網路模型與協定
    • 3.2.HTTP
      • 3.2.1.Basic concept
      • 3.2.2.Session & Cookie
    • 3.3.TCP/IP
    • 3.4.UDP
    • 3.5.子網路(subnet)
    • 3.6.子網路間的通訊
    • 3.7.路由
  • Chapter4: Protocol for Wireless network
    • 4.1.BLE, IBeacon
  • Chapter5: Cellular and Wifi
    • 5.1.Cellular module
      • 5.1.1.AT Command
      • 5.1.2.各家常用模組
        • 5.1.2.1.Cinterion
          • 5.1.2.1.1.PLS8-E
          • 5.1.2.1.2.PLS8-X
          • 5.1.2.1.3.PLS8-US
        • 5.1.2.2.Sierra
          • 5.1.2.2.1.MC-7354
        • 5.1.2.3.Telit
          • 5.1.2.3.1.LE910-EUG
          • 5.1.2.3.2.LE910-NAG
      • 5.1.3.用儀器測試Throughput
    • 5.2.MBIM for Windows
    • 5.3.Wireshark
      • 5.3.1.Capture filter
      • 5.3.2.Cli command
      • 5.3.3.Monitor mode
      • 5.3.4.Work with ssh
    • 5.4.LTE
      • 5.4.1.Introduction
      • 5.4.2.Types of networks
      • 5.4.3.Elements of access and core networks
      • 5.4.4.What's LTE different?
      • 5.4.5.LTE訊息傳輸
      • 5.4.6.3GPP (Generation Partnership Project)
      • 5.4.7.FDD, TDD, Half Duplex FDD
      • 5.4.8.Beared Types
Powered by GitBook
On this page

Was this helpful?

  1. Chapter5: Cellular and Wifi
  2. 5.4.LTE

5.4.7.FDD, TDD, Half Duplex FDD

Previous5.4.6.3GPP (Generation Partnership Project)Next5.4.8.Beared Types

Last updated 4 years ago

Was this helpful?

  • FDD

    • 分頻多工(Frequency-Division Duplexing, FDD)

    • 在頻率軸上以成對的方式進行分頻使用, 一頻帶用於下行頻寬(DL Bandwidth), 另一頻帶用於上行頻寬(UL Bandwidth)

    • 在相同頻寬配置下, FDD則為相同頻寬的上下行配置, 上下行各占用一半的資源比例, 此比例為固定

  • TDD

    • 分時多工(Time Division Duplexing, TDD)

    • 頻譜為上下行所共用, 上下行的配置是以時間進行分時配置, 一部分時間安排下行傳送, 另一部分則安排上行傳送. 在下行轉上行時, 會有一段保護時間(Guard Period, GP)用於接收與傳送間進行轉換

  • FDD v.s. TDD

    • 1.FDD模式為成對的頻譜配置, 而TDD為單一的頻譜配置

  • Half Duplex FDD

    • 1.Cost < FDD