VoLTE

VoLTE is 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, it was subsequently expanded to the Samsung Galaxy S6 series, iPhone 6s, LG G4 and Sony Xperia Z3+ .[3][4]

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.[5]

In October 2014, China Mobile, KPN and iBasis successfully implemented the first international VoLTE roaming between mobile operators based on IMS local breakout architecture with home routing systems.[6]

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 was expected to be available in 2015. Testing and design are being done between both companies using third party networks such as Alcatel-Lucent.[7]

On 11 July 2015, SEATEL Cambodia have announced the world's first commercial 100% VoLTE service without 2G/3G in Cambodia.[8][9][10][11][12]

On 16 September 2015, Telstra announced that it had started enabling VoLTE across its network, including calling to National Broadband Network and business and enterprise services with HD handsets.[13]

Deployment

Operator Country Status Date Note
Algerie Telecom  Algeria trialed May 2014 [14][15][16]
A1  Austria launched 30 November 2015 [17]
Optus  Australia trialed 2013 [18]
Telstra  Australia launched 16 September 2015 [13][19]
Vodafone  Australia launched 20 December 2015 [20] Initially only available in Queensland [21]
Azercell  Azerbaijan planned [22]
Batelco  Bahrain launched 20 September 2015 [23]
Algar Telecom  Brazil planned [24]
Max  Bulgaria trialed 2015 [25]
Wizion Broadband  Cambodia planned [26][27]
SEATEL  Cambodia launched July 2015 [10][11][12] 100% VoLTE without 2G/3G
Rogers  Canada launched March 2015 [28]
SaskTel  Canada planned 2016 [29]
Telus  Canada planned [30]
China Mobile  China launched August 2015 [31] Start in Hangzhou, Zhejiang
China Telecom  China planned 2017 [32]
China Unicom  China planned 2016 [32]
Avantel  Colombia planned June 2015 [33]
O2  Czech Republic planned 2015 [34]
T-Mobile  Czech Republic launched May 2015 [35]
3  Denmark planned 2015 [36]
TDC  Denmark trialed December 2014 [37][38] Only trialed in December 2014
Telenor  Denmark launched November 2015 [39] Limited to Samsung Galaxy S6 and S6 Edge at November 2015 launch. Apple iPhone 6/6 Plus and 6s/6s Plus added 19 January 2016.
Telia  Denmark planned 2015 [39]
CNT  Ecuador planned [40]
Bouygues Telecom  France launched November 2015 [41]
Orange  France planned [42]
SFR  France trialed [43]
O2  Germany launched April 2015 [44]
Telekom  Germany launched January 2016 [45]
Vodafone  Germany launched March 2015 [46]
3  Hong Kong launched May 2014 [47][48]
CMHK  Hong Kong launched September 2015 [49][50]
csl. / 1O1O  Hong Kong launched August 2014 [51][52][53][54][55]
PCCW  Hong Kong launched May 2014 [56][57]
SmarTone  Hong Kong launched August 2014 [58][59]
Siminn  Iceland planned [60]
Airtel  India planned [61][62][63]
Reliance Jio  India launched January 2016 [64][65][66]
Vodafone  India planned [67]
Videocon  India planned [68]
Bolt  Indonesia planned [69]
Smartfren  Indonesia planned [70]
Telkomsel  Indonesia trialed June 2015 [71]
TIM  Italy launched December 2015 [72]
Vodafone  Italy launched July 2015 [73]
au  Japan launched December 2014 [74][75]
NTT Docomo  Japan launched June 2014 [76]
SoftBank  Japan launched December 2014 [77]
VIVA  Kuwait launched June 2015 [78]
Ooredoo  Kuwait planned 2014 [79]
Zain  Kuwait trialed [80]
Alfa  Lebanon planned 2014 [81]
Swisscom  Liechtenstein launched June 2015 [82]
DiGi  Malaysia planned 2015 [83]
CTM  Macau launched October 2015 [84]
Vip  Macedonia planned 2015 [85]
KPN  Netherlands trialed [86][87][88]
Tele2  Netherlands planned 2016 [89]
Vodafone  Netherlands planned 2015 [90]
Spark  New Zealand trialed [91]
Vodafone  New Zealand trialed [92]
Smile  Nigeria planned 2015 [93]
Ice.net  Norway planned [94]
Telenor  Norway launched December 2015 [95]
Plus  Poland trialed [96]
Sferia  Poland planned [97]
Vodafone  Portugal launched 28 September 2015 [98]
Orange  Romania launched 11 September 2015 [99]
Vodafone  Romania trialed November 2014 [100]
MegaFon  Russia launched August 2015 [101] Moscow region only
MTS  Russia trialed [102]
Vimpelcom  Russia launched April 2015 [103] Moscow region only
Etisalat  Saudi Arabia trialed [104]
Mobily  Saudi Arabia planned [105]
vip  Serbia trialed 2015 [106]
M1  Singapore launched April 2015 [107][108]
Singtel  Singapore launched May 2014 [3]
StarHub  Singapore launched June 2014 [107][109]
Movistar  Spain planned January 2016 [110]
Vodafone  Spain launched July 2015 [111][112]
Orange  Spain planned January 2016 [113]
Simobil  Slovenia planned [114]
SWAN  Slovakia trialed September 2015 [115]
Telekom Slovenije  Slovenia planned [116]
Vodacom  South Africa launched April 2015 [117]
KT  South Korea launched October 2012 [118]
LG U+  South Korea launched August 2012 [119]
SK Telecom  South Korea launched August 2012 [120]
Tele2  Sweden planned 2015 [121]
Telenor  Sweden planned 2015 [122]
Telia  Sweden trialed [123]
Swisscom   Switzerland launched June 2015 [82]
Ambit Microsystems  Taiwan launched May 2015 [124]
Asia Pacific Telecom  Taiwan launched [125]
Chunghwa Telecom  Taiwan planned 2015 [126]
FarEasTone  Taiwan planned 2015 [126]
Taiwan Mobile  Taiwan launched Jan 2016 [127]
T Star  Taiwan planned 2015 [126]
Smile  Tanzania planned [93]
DTAC  Thailand launched October 2015 [128]
AIS  Thailand planned July 2014 [129]
Truemove  Thailand launched November 2015 [130]
Avea  Turkey trialed 2015 [131]
Turkcell  Turkey trialed 2015 [132]
Smile  Uganda launched November 2015 [133]
du  United Arab Emirates trialed [134]
Etisalat  United Arab Emirates trialed [135]
3  United Kingdom launched 15 September 2015 [136] Only available on 800 MHz, not 1800 MHz spectrum.[137] Most calls drop to 3G since 1800 MHz LTE is preferred over 800 MHz.
EE  United Kingdom planned 2015 [136]
O2  United Kingdom planned 2016 [136]
Vodafone  United Kingdom planned 2015 [136]
AT&T  United States launched May 2014 Branded as HD Voice[138] AT&T’s Voice Over LTE Network Reaches More than 27 Million Subscribers [139]
C Spire  United States planned [140]
Evolve Broadband  United States launched 2013 [141]
MetroPCS  United States launched August 2012 [142]
Sprint  United States planned [143]
T-Mobile  United States launched May 2014 [138][144] 1/3 of all calls are now VoLTE
U.S. Cellular  United States trialed [145]
Verizon  United States launched September 2014 Branded as Advanced Calling[146]
VTel Wireless  United States planned [147]
Digitel  Venezuela planned [148]

Devices

Brand Name Note
Apple iPhone 6 (Plus) [149]
iPhone 6S (Plus) [150]
BlackBerry Priv [151]
Fujitsu Arrows NX [152] F-02G, F-05F, F-04G
HTC Desire 524 [153]
Desire 526 [153]
Desire EYE [154]
J butterfly [155] HTV31
One (M8) [156]
One M9 [157]
Huawei Ascend D2 LTE [158]
Ascend P7 [100]
iida INFOBAR A03 [159]
Kyocera BASIO [160]
TORQUE G02 [161]
URBANO V01 [162]
URBANO V02 [163]
LG Disney Mobile on docomo [152] DM-01G
G Flex

G Flex 2

 [164]
G Pro [158] F240S
G2 [146]
G3 [165]
G4 [153]
isai vivid [166] LGV32
isai VL [167] LGV31
Lancet [153]
Optimus GX [158] F310L
Optimus LTE 2 [158] F160LV
Optimus LTE III [158] F260S
Optimus Vu II [158] F200L
Spirit LTE Indian Version
Vu 3 [158] F300
Microsoft Lumia 950 [168]
Lumia 950XL [168]
Lumia 640 [168]
Lumia 640 XL [168]
Lumia 550 [168]
Lumia 735 [153]
Motorola Droid Maxx [153]
Droid Mini [153]
Droid Turbo [169] XT-1254
Nexus 6 [153]
Moto G (3rd Gen) XT1550
Nokia Lumia 830 [170]
Pantech Vega Iron [158] IM-A870S
Vega N°6 [158] IM-A860S
Vega R3 [158] IM-A850L
Vega Secret Note [158] IM-A890S
Samsung Galaxy Avant [171]
Galaxy Core Prime [153]
Galaxy Golden [158] SHV-E400
Galaxy Grand [158] SHV-E270
Galaxy Light [164]
Galaxy Note II LTE [158] SHV-E250S
Galaxy Note 3 [3][56]
Galaxy Note 4 [172]
Galaxy Note 5 [173]
Galaxy Note 10.1 LTE [158]
Galaxy Note Edge [152] SC-01G
Galaxy Pop [158] SHV-E220S
Galaxy Round [158] SM-G910S
Galaxy S III LTE [158] SHV-E210
Galaxy S4 [158] SCH-R970C
Galaxy S4 mini LTE [138] GT-i9195
Galaxy S4 Zoom [158] SM-C105S
Galaxy S5 [164]
Galaxy S5 Active [152] SC-02G
Galaxy S6 (Edge) [174]
Galaxy S6 Edge+ [175]
Galaxy Win [158] SHV-E500S
Sharp AQUOS CRYSTAL [176]
AQUOS CRYSTAL 2 [176]
AQUOS CRYSTAL X [176]
AQUOS EVER [152] SH-04G
AQUOS PAD [152] SH-06F, SH-05G
AQUOS SERIE [177] SHV32
AQUOS SERIE mini [178] SHV31
AQUOS Xx [176]
AQUOS ZETA [152] SH-01G, SH-04F, SH-03G
Disney Mobile on docomo [152] SH-02G
Sony Xperia A4 [152] SO-04G
Xperia SP M35t [158]
Xperia Z2 [152] SO-03F
Xperia Z2 Tablet [152] SO-05F
Xperia M4 Aqua Dual [152] SO-06F
Xperia Z3 [152] SO-01G, D6653
Xperia Z3 Compact [152] SO-02G
Xperia Z4 [179] SO-03G
Xperia Z4 Tablet [152] SO-05G

All Windows Phone 8.1 devices or newer with GDR1 update or higher that include LTE have support for VoLTE.[180]

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 (AMR-WB), also known as HD Voice. This codec is mandated in 3GPP networks that support 16 kHz sampling.[181]

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.[182]

See also

References

  1. ↑ Nick Russell (3 March 2013). "Official Document IR.92 - IMS Profile for Voice and SMS" (PDF). GSMA. Retrieved 14 September 2014.
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