Nokia Siemens Networks has carried out the world’s first voice calls in LTE
networks using commercial, 3GPP-standardized user and network equipment. The success
of the voice calls and SMS texting demonstrate the viability of the One Voice
approach to voice over LTE (VoLTE).
A standards-compliant voice call in LTE was recently made by Nokia Siemens Networks
at its R&D centers in Germany and Finland. While the focus of most LTE trials and
deployment plans are on data service, LTE also has important benefits for voice
service as it offers the highest spectral efficiency for voice. Also, the delivery
of voice over LTE networks means operators will in the future be able to provide all
services over the same all-IP network, driving down the expense of operating
parallel legacy and LTE networks.
The call conducted by Nokia Siemens Networks used a configuration of commercially
ready LTE equipment fully 3GPP-compliant from end to end. The call was made from a
laptop equipped with the Nokia Siemens Networks Communication Suite “softphone”
application and an LG Electronics LTE USB Datacard. The network used for the call
included commercial versions of Nokia Siemens Networks’ Flexi Multiradio Base
Station with 3GPP-compliant software, Evolved Packet Core (EPC) and Fast Track VoLTE
The EPC provides data connectivity for LTE networks, while the Nokia Siemens
Networks Fast Track VoLTE solution provides fully 3GPP-standardized IP Multimedia
Subsystem (IMS) functionality to handle call control for mobile voice traffic in LTE
networks. Fast Track VoLTE is fully aligned with the One Voice initiative recently
announced by Nokia Siemens Networks and other industry stakeholders.
To further demonstrate the viability of 3GPP-standardized voice, Nokia Siemens
Networks’ will also soon conduct VoLTE test calls with a fully implemented IMS
system. In a separate related development, Nokia Siemens Networks recently conducted
a voice call using TD-LTE equipment in Hangzhou, China.
“Voice will continue to be an important application in mobile networks now and in
the future,” said Jürgen Walter, head of converged core, Nokia Siemens Networks.
“This successful LTE voice call takes us a step closer to realizing commercial
voice over LTE services. And the fact that we can now demonstrate this functionality
with both FDD and TDD variants of LTE means that we are well on track to
successfully introduce standardized LTE voice and SMS to all parts of the world.”
Nokia Siemens Networks is committed to driving the commercialization of LTE
services, including standardized LTE voice and SMS. The company offers operators the
most suitable evolution path towards an LTE based all-IP network, with a choice of
introducing voice over LTE by means of its award-winning Fast Track VoLTE solution
or its leading IMS solution.
Nokia Siemens Networks recently conducted the world’s first LTE call and handover
using commercial base station and fully standards-compliant software, and is
conducting end-to-end interoperability testing with four device vendors in different
frequency bands. It recently announced completion of the first interoperability
tests with LG Electronics in the 2100 MHz band.
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