VoLTE has been standardized by the GSM Association (GSMA). It is the result of an initiative by operators and vendors to define a single profile (i.e., set of LTE and IP Multimedia Subsystem [IMS] features for networks and devices) that enables a single LTE network to support both voice and data while maintaining a desired Quality of Service (QoS).

This course presents the different voice options possible with an LTE network and provides an end-to-end view of the network architecture required for VoLTE. It introduces the concept of Rich Communications Services (RCS). Specific aspects of IMS needed to support VoLTE are discussed. The course covers the basic VoLTE device registration and VoLTE call setup signaling procedures from an LTE and IMS perspective, including end-to-end QoS management. The course also presents VoLTE call transitions to other technologies (SRVCC), as well as emergency calls using VoLTE. This is followed by specific upper layer signaling/media transport protocols and LTE air interface protocol enhancements. Finally, VoLTE capacity and quality metrics are discussed.

PREREQUISITES
LTE Release 8/9 Air Interface
LTE Release 8/9 Call Processing

OBJECTIVES
• List the various voice options possible for an LTE network.
• Explain the functions of and interactions between the various LTE and IMS core network elements in a VoLTE capable network.
• Explain the concept and key feature set of Rich Communications Services (RCS).
• Identify the various transport protocols (RTP, RTCP, UDP, TCP) and their functions to support
VoLTE related signaling and media traffic.
• List various Session Initiation Protocol (SIP) signaling messages used for VoLTE call scenarios.
• Describe the VoLTE device registration process and VoLTE call setup signaling procedures with end-to-end QoS management in a VoLTE network.
• Describe how a VoLTE call can be seamlessly transferred to legacy networks using Single Radio Voice Call Continuity (SRVCC).
• Explain how emergency calls are handled in VoLTE networks.
• Explain the various features and enhancements related to the LTE upper layer protocols (dual IP stack, PDCP, ROHC, RLC-UM) to support VoLTE.
• Describe the various features and enhancements related to the LTE lower layer protocols (SemiPersistent Scheduling, TTI Bundling, Connected DRX) needed to support voice over LTE for a large number of wireless users over a wide coverage area.
• List VoLTE call performance metrics for Control Plane and User Plane and explain VoLTE capacity estimates


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