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Nov 18 2015

VoLTE – did you get it right the first time?

Twitter: @nokianetworks

Customer case: VoLTE optimization project yields 50% improvements in call drop rate in just 10 weeks.

There are currently about 30 live Voice Over LTE (VoLTE) operators in the world. Some of these networks are small, some large, but all have faced the same issues when launching new VoLTE services: How can they ensure that a subscriber’s first experience of VoLTE real time service will work together with the current voice network and fulfill the promise of VoLTE trademark HD quality?

Unfortunately, many of these operators have received customer complaints of inconsistent voice quality and an increase in dropped calls during their VoLTE launches. And here’s why. Overall, there’s still insufficient hands-on experience and understanding about what real time traffic in LTE networks require, particularly when providing VoLTE with current voice core including handovers.

When VoLTE was first launched, the VoLTE to VoLTE call was excellent wherever LTE coverage was in place. Then there was still plenty of time to react to issues as the amount of users was small, but today’s larger networks have millions of subscribers hungry for the HD voice and data experience, and operators can’t afford to lose them because of insufficient VoLTE planning and implementation.


I recently participated in Nokia’s Quality Awards 2015, where one finalist presented a project related to VoLTE network optimization focused specifically on large networks. He showed how the network call drop rate in a multivendor environment could be improved by over 50% in just 10 weeks, which was many months ahead of the operator’s own target. This translates into significant savings in the longer run by ensuring satisfied end users. Based on a customer-driven VoLTE market study, a 1% increase in Drop Call Rate leads to a 1.7% increase in customer churn. When customer complaint handling is added on top of this, a well-planned and optimized VoLTE network can translate into savings in the millions.

Another remarkable learning here was the method used to implement this project, which was the reason it was front and center at the Nokia Quality Awards event. In this case, Nokia Networks worked with the operator using DMAIC (Define, Measure, Analyze, Improve and Control) – an improvement cycle which is the core tool used to drive Six Sigma projects. The goal is to ensure extremely high quality results in a very short time frame.

The operator was able to provide real time communications using 2G, 3G, LTE, WiFi, networks and their subscribers experienced the same or better performance regardless of the network access used: CS call, VoLTE or VoWiFi.

The bottom line may sound cliché but there’s really no substitute for “getting it right the first time”. So let’s work together to optimize your VoLTE network prior to launching a service your subscribers will love.

Want to take a deeper dive into this topic? Read our White Paper: Nokia Voice Over LTE optimization.

Please share your thoughts on this topic by replying below – and join the discussion with @nokianetworks on Twitter using #NetworksPerform.

About Ismo Matilainen

Ismo is responsible for Nokia Global LTE voice evolution marketing. Feel free to ask him about anything related to IMS core VoLTE and Voice over Wi-Fi or communication services using APIs. He is particularly pleased to see business models with existing IMS technology now developing to include more and better digitalized service possibilities.