Telefónica Deutschland:World's first handovers of voice calls from LTE to UMTS under realistic conditions

-In the lab: Voice calls that begin as Voice over LTE (VoLTE) are continued as conventional mobile calls when leaving the LTE network
-Single Radio Voice Call Continuity (SRVCC) is working under the same conditions as apply in real mobile networks
-World's first network provider to demonstrate SRVCC with components from multiple suppliers
MUNICH/GERMANY. Telefónica has made a breakthrough in Germany: the network operator is the first in the world to demonstrate in a multi-vendor environment a technology transferring telephone calls from the LTE network to the UMTS mobile network without interruption. This so-called "handover" was achieved a few days ago in the lab under similar conditions to those found in real mobile networks. With an imperceptible switch-over, voice calls that begin as Voice over LTE (VoLTE) are continued as conventional mobile calls when leaving the LTE network.
Progress is two-fold: until now virtually all LTE smartphones have had to switch to older standards such as GSM or UMTS for telephone calls. VoLTE is available only in a few places. However Telefónica has now installed this new technology in the test-lab and has shown handover working to the 3G mobile network. In future, this will be especially convenient in cars when drivers leave LTE signal range, because without the ability to hand over, VoLTE telephone calls would break off at this point. Another advantage: with VoLTE customers can enjoy faster call set-up and better battery life.
"Telefónica Deutschland is once again showing that we are among the pioneers. Our VoLTE technology is leading the field worldwide and we are one of the three providers in Germany using the powerful 800-megahertz frequencies for LTE, which are the only ones that enable a nationwide provision of super-fast mobile Internet", says René Schuster, CEO of Telefónica Deutschland. "Using VoLTE with handover to GSM and UMTS, O2 customers will have the best possible audio quality and reliability for their telephone calls with LTE smartphones." The engineers use the SRVCC standard (Single Radio Voice Call Continuity) for the handover from the LTE network to a neighbouring UMTS cell. Telefónica in Germany is the first network provider in the world to demonstrate SRVCC with components from several different suppliers, corresponding to the actual conditions in today's mobile communication networks. Handsets and network components from at least six different manufacturers have been used: Acme Packet, Ericsson, Huawei, NokiaSiemensNetworks, Qualcomm and Sony Mobile.
In doing this, Telefónica in Germany is demonstrating the advantages of its converged infrastructure for mobile and landline communications, based completely on the Internet protocol (IP): the engineers are currently building a single core network for telephone calls on landlines and mobiles using a common IP multimedia subsystem (IMS). For the new VoLTE telephone calls, Telefónica uses the same IMS core which is already being used by millions of customers for DSL telephone calls. The same mobile phone subscriber database is also used as for the previous technologies GSM and UMTS. At the Mobile World Congress in Barcelona this month (25-28 February) Telefónica will showcase market-leading innovative demonstrations on the implementation of Voice in LTE networks, as well as outlining its next generation wireless strategy for the future. Visit us in Hall 3, Stand 3B108.
Telefónica Deutschland Holding AG, listed at the Frankfurt Stock Exchange in the Prime Standard, and its wholly-owned, operationally active subsidiary Telefónica Germany GmbH & Co. OHG belong to Telefónica Europe and are part of the Spanish telecommunication group Telefónica S.A. The company offers its German private and business customers post-paid and prepaid mobile telecom products as well as innovative mobile data services based on the GPRS, UMTS and LTE technologies with its product brand O2. In addition, the integrated communications provider also offers DSL fixed network telephony and high-speed internet. Telefónica Europe has more than 105 million mobile and fixed network customers in Spain, Great Britain, Ireland, the Czech Republic, Slovakia and Germany.