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Revision as of 21:06, 7 January 2015

VoLTE, an acronym for Voice over LTE, which is based on the IP Multimedia Subsystem (IMS) network, with specific profiles for control and media planes of voice service on LTE defined by GSMA in PRD IR.92. This approach results in the voice service (control and media planes) being delivered as data flows within the LTE data bearer. This means that there is no dependency on (or ultimately, requirement for) the legacy circuit-switched voice network to be maintained. VoLTE has up to three times more voice and data capacity than 3G UMTS and up to six times more than 2G GSM. Furthermore, it frees up bandwidth because VoLTE’s packets headers are smaller than those of unoptimized VoIP/LTE.

History

In May 2014, SingTel introduced the world's first commercial "full-featured" VoLTE service in Singapore, initially only in combination with the Galaxy Note 3.

In June 2014, KT showcased the world’s first cross-border roaming services based on Voice over LTE. The South Korean operator partnered with China Mobile to develop VoLTE roaming services.

In October 2014, China Mobile, KPN and iBasis have successfully implemented the first international VoLTE roaming between mobile operators based on IMS local breakout architecture with a home routing systems.

In November 2014, Verizon and AT&T have announced the companies are enabling VoLTE-to-VoLTE connections between their respective customers. VoLTE interoperability between Verizon and AT&T customers is expected to be available in 2015.

Deployment

Operator Country Status Date Note
Optus  Australia trialed
Telstra  Australia planned 2015
Vodafone  Australia planned 2015
A1  Austria planned 2015
Azercell  Azerbaijan planned
Telus  Canada planned
China Mobile  China planned 2014
Avantel  Colombia planned
T-Mobile  Czech Republic planned 2015
CNT  Ecuador planned
Bouygues  France planned 2015
SFR  France trialed
E-Plus  Germany planned
O2  Germany in trial
Telekom  Germany trialed
Vodafone  Germany planned 2015
csl.  Hong Kong launched October 2014
3  Hong Kong launched May 2014
SmarTone  Hong Kong launched August 2014
PCCW  Hong Kong launched May 2014
Airtel  India trialed
Vodafone  Italy planned mid-2015
au  Japan planned
NTT Docomo  Japan launched June 2014
Ooredoo  Kuwait planned 2014
Zain  Kuwait trialed
Alfa  Lebanon planned 2014
Vip  Macedonia planned 2015
KPN  Netherlands Live Pilot
Vodafone  Netherlands planned 2015
Smile  Nigeria trialed
Net 1  Norway planned
Plus  Poland trialed
Vodafone  Romania launched November 2014
MegaFon  Russia in trial
MTS  Russia trialed
Vimpelcom  Russia trialed
Etisalat  Saudi Arabia trialed
Mobily  Saudi Arabia planned
M1  Singapore planned 2014
SingTel  Singapore launched May 2014
StarHub  Singapore trialed
Vodafone  Spain in trial
Telekom Slovenije  Slovenia planned
Simobil  Slovenia planned Cite error: There are <ref> tags on this page without content in them (see the help page).
Vodacom  South Africa trialed
KT  South Korea launched October 2012
LG U  South Korea launched August 2012
SK Telecom  South Korea launched August 2012
Tele2  Sweden trialed
Swisscom   Switzerland planned 2015
APT  Taiwan planned
Smile  Tanzania trialed
Altyn Asyr  Turkmenistan launched September 2014
Smile  Uganda trialed
du  United Arab Emirates trialed
EE  United Kingdom planned 2015
Vodafone  United Kingdom trialed
AT&T  United States launched May 2014
C Spire  United States planned
MetroPCS  United States launched August 2012
Sprint  United States planned
T-Mobile  United States launched May 2014
Verizon  United States launched September 2014
Digitel  Venezuela planned

Devices

Brand Name Note
Apple iPhone 6
iPhone 6 Plus
Fujitsu Arrows NX F-02G, F-05F
HTC Desire EYE
Huawei Ascend D2 LTE
Ascend P7
LG G Flex
G Pro F240S
G2
Isai VL
Optimus GX F310L
Optimus LTE 2 F160LV
Optimus LTE III F260S
Optimus Vu 2 F200L
Vu 3 F300
Motorola Droid Turbo XT-1254
Nokia Lumia 830
Pantech Vega Iron IM-A870S
Vega N°6 IM-A860S
Vega R3 IM-A850L
Vega Secret Note IM-A890S
Samsung Galaxy Avant
Galaxy Golden SHV-E400
Galaxy Grand SHV-E270
Galaxy Light
Galaxy Note II LTE SHV-E250S
Galaxy Note 3
Galaxy Note 10.1 LTE
Galaxy Note Edge SC-01G
Galaxy Pop SHV-E220S
Galaxy Round SM-G910S
Galaxy S III LTE SHV-E210
Galaxy S4 SCH-R970C
Galaxy S4 mini LTE GT-i9195
Galaxy S4 Zoom SM-C105S
Galaxy S5
Galaxy S5 Active SC-02G
Galaxy Win SHV-E500S
Sharp Aquos Pad SH-06F
Aquos Zeta SH-01G, SH-04F
Disney Mobile on docomo SH-02G
Sony Xperia SP M35t
Xperia Z2 SO-03F
Xperia Z2 Tablet SO-05F
Xperia Z3 SO-01G
Xperia Z3 Compact SO-02G

Voice quality

To ensure compatibility, 3GPP demands at least AMR-NB codec (narrow band), but the recommended speech codec for VoLTE is Adaptive Multi-Rate Wideband, also known as HD Voice. This codec is mandated in 3GPP networks that support 16 kHz sampling.

Fraunhofer IIS has proposed and demonstrated "Full-HD Voice", an implementation of the AAC-ELD (Advanced Audio Coding – Enhanced Low Delay) codec for LTE handsets. Where previous cell phone voice codecs only supported frequencies up to 3.5 kHz and upcoming wideband audio services branded as HD Voice up to 7 kHz, Full-HD Voice supports the entire bandwidth range from 20 Hz to 20 kHz. For end-to-end Full-HD Voice calls to succeed however, both the caller and recipient's handsets as well as networks have to support the feature.

See also

References

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