Voice over LTE: Challenges and Opportunities
An Industry Whitepaper
The Policy and Charging Rules Function (PCRF) is the key element that enables the transition to and reliable operation of VoLTE services. Heavy Reading reports that more than 70 percent of service providers believe they will need to upgrade or replace their existing data PCRF to handle the rigors of VoLTE.
With voice services now sharing the pipe with other data services like web browsing, video and social media, the ability to manage the speed, quality, volume and diameter signaling associated with VoLTE is critical to providing a differentiated experience.
Additionally, although the LTE network provides a framework for signaling application QoS, CSPs need to verify the actual quality experienced by subscribers who have purchased VoLTE services. There is a significant difference between signaling priority and verifying subscriber quality of experience (QoE).
There is also an opportunity for CSPs to consolidate their control plane architecture with a PCRF element that can leverage the LTE QoS architecture to enable such use cases such as non-IMS voice services, gaming, universal fixed and mobile policy control, and WiFi offload. A capable PCRF offers CSPs the opportunity to save costs and deploy additional revenue-generating services that capitalize on the new QoS control capabilities of the LTE network.
This paper first presents a crash course in VoLTE, and then explores the challenges and opportunities associated with this emerging technology.