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Voice over LTE

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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.[1] 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.[2]

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.[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.[4]

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.[5]

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. Testing and design are being done between both companies using third party networks such as Alcatel-Lucent.[6]

In 11 July 2015, SEATEL Cambodia have announced the world's first commercial 100% VoLTE service without 2G/3G in Cambodia.[7][8][9][10][11]

Deployment

Operator Country Status Date Note
A1  Austria planned 2015 [12]
Optus  Australia trialed 2013 [13]
Telstra  Australia planned 2015 [14]
Vodafone  Australia planned 2015 [15]
Azercell  Azerbaijan planned [16]
Algar Telecom  Brazil planned [17]
Max  Bulgaria trialed 2015 [18]
SEATEL  Cambodia launched July 2015 [9][10][11] 100% VoLTE without 2G/3G
Rogers  Canada launched March 2015 [19]
SaskTel  Canada planned 2016 [20]
Telus  Canada planned [21]
China Mobile  China launched August 2015 [22] Start in Hangzhou, Zhejiang
Avantel  Colombia planned June 2015 [23]
O2  Czech Republic planned 2015 [24]
T-Mobile  Czech Republic launched May 2015 [25]
3  Denmark planned 2015 [26]
TDC  Denmark launched December 2014 [27][28]
Telenor  Denmark trialed 2015 [29]
Telia  Denmark planned 2015 [29]
CNT  Ecuador planned [30]
Bouygues  France planned 2015 [31]
Orange  France planned [32]
SFR  France trialed [33]
O2  Germany launched April 2015 [34]
Telekom  Germany planned 2015 [35]
Vodafone  Germany launched March 2015 [36]
3  Hong Kong launched May 2014 [37][38]
CMHK  Hong Kong planned [39]
csl. / 1O1O  Hong Kong launched August 2014 [40][41][42]
PCCW  Hong Kong launched May 2014 [43][44]
SmarTone  Hong Kong launched August 2014 [45][46]
Siminn  Iceland planned [47]
Airtel  India trialed [48]
Reliance  India planned [49]
Videocon  India planned [50]
Vodafone  Italy launched July 2015 [51]
au  Japan launched December 2014 [52][53]
NTT Docomo  Japan launched June 2014 [54]
SoftBank  Japan launched December 2014 [55]
VIVA  Kuwait launched June 2015 [56]
Ooredoo  Kuwait planned 2014 [57]
Zain  Kuwait trialed [58]
Alfa  Lebanon planned 2014 [59]
Swisscom  Liechtenstein launched June 2015 [60]
Vip  Macedonia planned 2015 [61]
KPN  Netherlands Live Pilot [62][63][64]
Vodafone  Netherlands planned 2015 [65]
Spark  New Zealand trialed [66]
Vodafone  New Zealand in trial [67]
Smile  Nigeria planned 2015 [68]
Net 1  Norway planned [69]
Plus  Poland trialed [70]
Sferia  Poland planned [71]
Vodafone  Romania launched November 2014 [72]
MegaFon  Russia in trial [73]
MTS  Russia trialed [74]
Vimpelcom  Russia Live Pilot August 2015 [75] Start in Moscow and surrounding Moscow region.
Etisalat  Saudi Arabia trialed [76]
Mobily  Saudi Arabia planned [77]
vip  Serbia trialed 2015 [78]
M1  Singapore launched April 2015 [79][80]
Singtel  Singapore launched May 2014 [3]
StarHub  Singapore launched June 2014 [79][81]
Vodafone  Spain launched July 2015 [82][83]
Simobil  Slovenia planned [84]
SWAN  Slovakia trialed September 2015 [85]
Telekom Slovenije  Slovenia planned [86]
Vodacom  South Africa launched April 2015 [87]
KT  South Korea launched October 2012 [88]
LG U+  South Korea launched August 2012 [89]
SK Telecom  South Korea launched August 2012 [90]
Tele2  Sweden planned 2015 [91]
Telenor  Sweden planned 2015 [92]
Telia  Sweden in trial [93]
Swisscom   Switzerland launched June 2015 [60]
Ambit Microsystems  Taiwan launched May 2015 [94]
Asia Pacific Telecom  Taiwan planned [95]
Chunghwa Telecom  Taiwan planned 2015 [96]
FarEasTone  Taiwan planned 2015 [96]
Taiwan Mobile  Taiwan planned 2016 [97]
Vibo Telecom  Taiwan planned 2015 [96]
Smile  Tanzania planned [68]
DTAC  Thailand in trial [98]
Avea  Turkey trialed 2015 [99]
Turkcell  Turkey trialed 2015 [100]
Altyn Asyr  Turkmenistan launched September 2014 [101]
Smile  Uganda planned 2015 [68]
du  United Arab Emirates trialed [102]
Etisalat  United Arab Emirates trialed [103]
3  United Kingdom planned September 2015 [104]
EE  United Kingdom planned 2015 [104]
O2  United Kingdom planned 2016 [104]
Vodafone  United Kingdom planned 2015 [104]
AT&T  United States launched May 2014 [105]
C Spire  United States planned [106]
MetroPCS  United States launched August 2012 [107]
Sprint  United States planned [108]
T-Mobile  United States launched May 2014 [105]
US Cellular  United States in trial [109]
Verizon  United States launched September 2014 [110]
VTel Wireless  United States planned [111]
Digitel  Venezuela planned [112]

Devices

All Windows Phone 8.1 devices or newer with GDR1 update or higher that include LTE have support for VoLTE.[113]

Brand Name Note
Apple iPhone 6 [114]
iPhone 6 Plus [114]
Fujitsu Arrows NX [115] F-02G, F-05F, F-04G
HTC Desire 526 [116]
Desire 526 [116]
Desire EYE [117]
One (M8) [118]
One M9 [119]
Huawei Ascend D2 LTE [120]
Ascend P7 [72]
LG Disney Mobile on docomo [115] DM-01G
G Flex [121]
G Pro [120] F240S
G2 [110]
G3 [122]
G4 [116]
isai VL [123] LGV31
Lancet [116]
Optimus GX [120] F310L
Optimus LTE 2 [120] F160LV
Optimus LTE III [120] F260S
Optimus Vu II [120] F200L
Vu 3 [120] F300
Microsoft Lumia 640 [124]
Lumia 640 XL [124]
Lumia 735 [116]
Motorola Droid Maxx [116]
Droid Mini [116]
Droid Turbo [125] XT-1254
Nexus 6 [116]
Nokia Lumia 830 [126]
Pantech Vega Iron [120] IM-A870S
Vega N°6 [120] IM-A860S
Vega R3 [120] IM-A850L
Vega Secret Note [120] IM-A890S
Samsung Galaxy Avant [127]
Galaxy Core Prime [116]
Galaxy Golden [120] SHV-E400
Galaxy Grand [120] SHV-E270
Galaxy Light [121]
Galaxy Note II LTE [120] SHV-E250S
Galaxy Note 3 [3][43]
Galaxy Note 4 [128]
Galaxy Note 5 [129]
Galaxy Note 10.1 LTE [120]
Galaxy Note Edge [115] SC-01G
Galaxy Pop [120] SHV-E220S
Galaxy Round [120] SM-G910S
Galaxy S III LTE [120] SHV-E210
Galaxy S4 [120] SCH-R970C
Galaxy S4 mini LTE [105] GT-i9195
Galaxy S4 Zoom [120] SM-C105S
Galaxy S5 [121]
Galaxy S5 Active [115] SC-02G
Galaxy S6 [130]
Galaxy S6 edge [130]
Galaxy S6 edge+ [131]
Galaxy Win [120] SHV-E500S
Sharp Aquos Ever [115] SH-04G
Aquos Pad [115] SH-06F, SH-05G
Aquos Zeta [115] SH-01G, SH-04F, SH-03G
Disney Mobile on docomo [115] SH-02G
Sony Xperia A4 [115] SO-04G
Xperia SP M35t [120]
Xperia Z2 [115] SO-03F
Xperia Z2 Tablet [115] SO-05F
Xperia Z3 [115] SO-01G, D6653
Xperia Z3 Compact [115] SO-02G
Xperia Z4 [132] SO-03G
Xperia Z4 Tablet [115] SO-05G

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.[133]

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.[134]

See also

References

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