4G/5G Cellular Networks Quiz

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Questions and Answers

What is the function of the Base station (eNode-B) in 4G LTE architecture?

  • Manages wireless radio resources and mobile devices in its coverage area (correct)
  • Acts as the PDN gateway to the Internet
  • Stores the International Mobile Subscriber Identity (IMSI) on SIM card
  • Coordinates with nearly base stations to optimize radio use

What is the role of the User Equipment (UE) in 4G LTE?

  • Coordinates with other base stations to optimize radio use
  • Acts as the PDN gateway to the Internet
  • Stores the International Mobile Subscriber Identity (IMSI) on SIM card
  • Manages wireless radio resources and mobile devices in its coverage area (correct)

What is the function of the Mobility Management Entity (MME) in 4G LTE?

  • Handles signaling between the mobile device (UE) and the evolved Node B (eNode-B) (correct)
  • Coordinates with nearly base stations to optimize radio use
  • Acts as the PDN gateway to the Internet
  • Manages wireless radio resources and mobile devices in its coverage area

What is the purpose of the Home Subscriber Service (HSS) in 4G LTE architecture?

<p>Serves as the home location register for subscriber-related data (D)</p> Signup and view all the answers

What is the function of the Serving Gateway (S-GW) in 4G LTE?

<p>Routes data packets to and from the mobile device (C)</p> Signup and view all the answers

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Study Notes

Cellular Networks

  • 4G/5G cellular networks enable widespread deployment and use of mobile Internet, with more mobile-broadband-connected devices than fixed-broadband-connected devices (5:1 in 2019).

4G Availability and Technical Standards

  • 4G availability: 97% of the time in Korea and 90% in the US
  • Transmission rates up to 100's Mbps
  • Technical standards: 3rd Generation Partnership Project (3GPP) - www.3gpp.org
  • 4G standard: Long-Term Evolution (LTE)

Similarities to Wired Internet

  • Edge/core distinction, but both belong to the same carrier
  • Global cellular network: a network of networks
  • Widespread use of protocols:
    • HTTP
    • DNS
    • TCP
    • UDP
    • IP
    • NAT
    • Separation of data/control planes
    • SDN
    • Ethernet
    • Tunneling

Differences from Wired Internet

  • Different wireless link layer
  • Mobility as a 1st class service
  • User "identity" (via SIM card)
  • Business model: users subscribe to a cellular provider
  • Strong notion of "home network" versus roaming on visited nets
  • Global access, with authentication infrastructure, and inter-carrier settlements

Elements of 4G LTE Architecture

  • Mobile device:
    • Smartphone
    • Tablet
    • Laptop
    • IoT

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