Wi-Fi Calling

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).
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Course Introduction
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Section 1 - Wi-Fi Calling Architecture
Section 2 - Initial Procedures
Section 3 - Making and Receiving Calls over Wi-Fi
Section 4 - Mobility and Interworking

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.

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.

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.

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.

The Institute of Telecommunications Professionals (ITP)

The ITP is the UK’s leading independent institution for people who work in telecommunications. It is dedicated to promoting the professional development of members through Professional Registration, training, mentoring and qualifications. The ITP collaborates with regulators, government associations and other leading bodies on projects that are important to the future of the industry. It has worked with businesses including; BT, Cable & Wireless Worldwide, Alcatel-Lucent, Huawei and Vodafone.  Find out more about The ITP and how you can become a member.

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