Often associated with VoLTE (Voice over Long Term Evolution), Wi-Fi Calling is the means by which service providers can support seamless mobility between the LTE and Wi-Fi networks, whilst maintaining voice services. The course builds on the LTE System Engineering and Wi-Fi System Engineering courses and explains in detail the enhancements that need to be made to the network to support VoWi-Fi, before describing how a call is established across Wi-Fi using the services of the EPC (Evolved Packet Core) and IMS (IP Multimedia Subsystem).
Intermediate |
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Section 1 - Wi-Fi Calling Architecture

Topic areas covered include:

  • Wi-Fi Calling Architecture Fundamentals:
    • VoLTE and VoWi-Fi.
    • Deployment Scenarios.
    • Network Architectures:
      • Trusted Non-3GPP Access.
      • Untrusted Non-3GPP Access.
  • Mobility Mechanisms:
    • Host Based Mobility.
    • Network Based Mobility:
      • PMIPv6.
      • GTP.
    • Multi Access PDN Connectivity.
    • Non seamless Wi-Fi Offload.
  • Network Architecture:
    • Untrusted Non-3GPP Access (GTP):
      • UE, Access Point, ePDG, PDN-GW, AAA Server, PCRF, ANDSF.
      • Protocol Stacks and Reference Points.
    • IP Multimedia Subsystem:
      • P-CSCF, S-CSCF, I-CSCF.
      • IMS Protocols.
  • Roaming Architectures:
    • Home Routed.
    • Local Breakout.
Section 2 - Initial Procedures

Topic areas covered include:

  • Initial Procedures Fundamentals:
    • Bearer Models and Bearer Mapping.
  • Network Discovery and Selection:
    • Network Discovery:
      • RAN Assistance Information.
      • ANDSF Rules.
    • Accessing the Wi-Fi Network:
      • Finding a Wi-Fi Network.
      • Joining a Wi-Fi Network.
      • WPA and Robust Security Networking.
    • ePDG Selection.
  • Initial Attach:
    • IKEv2 and IPSec.
    • EAP-AKA:
      • Detailed Signalling Evaluation.
    • Session Creation and Management:
      • Detailed Signalling Evaluation.
Section 3 - Making and Receiving Calls over Wi-Fi

Topic areas covered include:

  • Making and Receiving Calls Fundamentals.
  • IMS Registration:
    • IMS Identities:
      • Private User Identities.
      • Public User Identities.
      • Service Profiles.
    • Initial Registration Phase:
      • Detailed Signalling Evaluation.
    • Registration security Phase:
      • Detailed Signalling Evaluation.
    • Final Registration Phase:
      • Detailed Signalling Evaluation.
  • Mobile Originated Call Setup:
    • VoWi-Fi to VoWi-Fi / VoLTE:
      • Detailed Signalling Evaluation.
    • VoWi-Fi to PSTN:
      • Detailed Signalling Evaluation.
  • Mobile Terminated Call Setup:
    • VoWi-Fi / VoLTE to VoWi-Fi:
      • Detailed Signalling Evaluation.
    • PSTN to VoWi-Fi
      • Detailed Signalling Evaluation.
  • Emergency Calls.
  • Instant Messaging.
Section 4 - Mobility and Interworking

Topic areas covered include:

  • Mobility and Interworking Fundamentals.
  • Wi-Fi Mobility:
    • Access Point Channel Reports.
    • Wi-Fi Reassociation.
    • 802.11 Amendments:
      • 802.11k, 802.11r.
  • Wi-Fi to LTE Handover:
    • Detailed Signalling Evaluation.
    • Mobility when LTE Attached.
  • LTE to Wi-Fi Handover:
    • Detailed Signalling Evaluation.
  • Wi-Fi Calling and Roaming:
    • Home ePDG.
    • Home PDN-GW.
    • Visited PDN-GW.