Fundamentals of Voice in LTE

Subject: 4G LTE
Category: Core
Duration: 1 day

Course outline:

Introduction to EPS

● IP in the Core Network
● Overview of EPC protocols: GTP, X2AP, S1-AP, S1-MME, GTP, Diameter
● IP connectivity, user plane and control plane

Circuit Switched Fallback (CSFB)

● Fundamentals of CSFB
● SGs interface / SGsAP Protocol
● CFSB call setup
● Options for SMS over LTE (using SGs interface or IMS)

IMS and voice over LTE

● IMS architecture and nodes (S-CSCF, P-CSCF, I-CSCF, AS, HSS, MRFC, MRFP, etc)
● VoLTE services: Multimedia Telephony (MMTel) and Supplementary Services
● IMS example procedures: End-To-End call establishment, Session service procedure

Single Radio Voice Call Continuity (SRVCC)

● Fundamentals of SRVCC
● SRVCC-related elements: Sv and I2 interfaces, enhanced MSC server
● Service Centralization and Continuity AS (SCCAS)
● SRVCC and ISC (IMS Service Continuity)

Policy and Charging Control in EPS and IMS

● IP Connectivity Access Networks (IP-CANs) relation to PCC
● IP-CAN bearer establishment procedure
● IMS based charging principles (PCC rules and high level PCC operation)
● PCC nodes and functions (PCRF, PCEF, AF and SPR)

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