LTE World Summit

I’m just back from Berlin at Informa’s LTE World Summit event. There is no doubt that voice was a hot topic. Voice over LTE permeated all three days of the conference.

While IMS remains most operator’s long term voice strategy, it’s clear that a more immediate solution is required. To date a technology called CS Fallback has emerged as the primary ‘competition’ to VoLGA.

Marc Fossier, vice president for Orange/FT Group, articulated the general perception of CS Fallback, when he said in his presentation that “…2G/3G fallback is not a very nice solution, but it could be usable.” That’s a vote of confidence!

Later in the conference, Franz Seiser with T-Mobile presented VoLGA. Mr. Seiser articulated the drivers for T-Mobile to push VoLGA. T-Mobile requirements for voice over LTE include:

• Provide a good customer experience
• Use the LTE radio
  
• Build upon the existing Rel-4 CS network and investment
• “do not touch the MSC”
• Build upon fully 3GPP compliant Rel-8 EPC/LTE network
• Reuse existing CS roaming/interconnect regime
• Minimize impact on handset, especially the UI

For this, T-Mobile has ruled out CS Fallback. After this conference, I suspect other operators will as well.