|[August 18, 2014]
Signals Research Group's New Benchmark Study Reveals VoLTE Outperforms Both 3G Circuit Switched Voice and Skype
SUNNYVALE, Calif. --(Business Wire)--
Communications, the leader in testing networks, services and
devices, announced today it is collaborating with Signals
Research Group (SRG) to conduct a two-part study that evaluates the
VoLTE User Experience by analyzing VoLTE voice quality, call performance
and battery performance. The recently completed part
one of this benchmark study compared VoLTE service to 3G Circuit
Switched Voice and Over The Top (OTT) Skype (News - Alert) Voice Service on the live
network of a major US operator. The study revealed VoLTE is worth the
wait and successfully delivers on the promise of superior Quality of
Experience (QoE) and efficient use of network resources.
Some key highlights of the study include:
VoLTE call quality, measured in terms of MOS using the
industry-accepted POLQA algorithm, greatly exceeded that of 3G CS
voice and was measurably higher than Skype Voice;
VoLTE performance was considerably better than that of
Skype when network loading and background applications were running on
the mobile phone and transferring data with the network;
VoLTE displayed significantly shorter call set up times
than Circuit-Switched Fallback (CSFB);
VoLTE required substantially fewer network resources
than Skype which resulted in a far greater network efficiency and a
meaningfully-longer estimated mobile battery life.
"Although conceptually I understood the potential benefits of VoLTE, it
wasn't until we analyzed the results that we collected with Spirent (News - Alert) that
I truly appreciated the incremental benefits that VoLTE offers,"
commented Michael Thelander, the President of Signals Research Group. "I
am really looking forward to the second part of our study when we have
the opportunity to do sensitivity studies and take observations made in
the field and confirm them in a tightly-controlled lab environment with
Spirent's test equipment and enginering resources."
With OTT services such as Skype being readily available to mobile users,
the driver behind VoLTE deployment is the opportunity for wireless
carriers to realize the full potential of LTE (News - Alert) and provide a guaranteed
Quality of Service (QoS) for voice services on their LTE network. The
study results validated that, although both VoLTE and Skype support HD
Voice, VoLTE-specific features such as guaranteed bearer (i.e. ability
to treat voice calls with higher priority over best-effort data packets)
make the difference and deliver a much higher quality voice service to
the mobile user. Additional positive network and user experience
implications are expected as carriers push to launch improvements in
their LTE deployments and expand LTE coverage.
"It was Spirent's sincere pleasure to collaborate with SRG on this
long-awaited VoLTE study," said Nigel Wright, Vice President Spirent
Communications. "We have been aggressively working with leading
carriers, device and chipset manufacturers for the past several years on
testing everything VoLTE and we are delighted to showcase the arrival of
a superior experience for the mobile user."
In this study, the Spirent Nomad
User Experience Analytics System was used to measure the call
quality (in terms of MOS) of the three voice applications and to control
and capture performance data during the call setup and reliability
tests. The Spirent Quantum
Battery Life Measurement System was used to measure power
consumption, current drain and the implied battery life for the three
applications, plus Skype Video. Spirent Datum
was used to simulate real world data usage.
The two measurement systems can also be used in a controlled lab
environment with data captured from the live network to replicate many
of the same test scenarios. This powerful ability enables the
introduction of subtle changes such as different RF conditions and IP
impairments to generate a more detailed VoLTE user experience analysis,
which will be the focus of a second part of this benchmark study.
For a preview of the report in Signals Ahead, "Behind The VoLTE Curtain,
Part 1: Quantifying The Performance of a Commercial VoLTE Deployment"
please visit the consultancy's website at www.signalsresearch.com.
For more information on Spirent's Nomad User Experience Analytics
System, please visit http://www.spirent.com/Service-Experience/Fit4Launch_Measurement_Systems/Nomad_HD.
For more information on Spirent's Quantum (News - Alert) Battery Performance
Measurement System, please visit http://www.spirent.com/Service-Experience/Fit4Launch_Measurement_Systems/Quantum.
About Spirent Communications (News - Alert) plc
Spirent Communications plc. (LSE: SPT), a global leader in test and
measurement, offers an extensive portfolio of solutions to test data
centers, cloud computing and virtualized environments, high speed
Ethernet networks and services, 3G/4G wireless networks and devices,
network and application security, and positioning technologies. For more
information visit http://www.spirent.com/about-us/News_Room/About_Spirent_Communications_plc.aspx
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