ViLTE, an acronym for "Video over LTE", is a conversational (i.e. person to person) video service based on the

IP Multimedia Subsystem The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is a standardised architectural framework for delivering IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched-styl ...

(IMS) core network like VoLTE. It has specific profiles for the

control Control may refer to: Basic meanings Economics and business * Control (management), an element of management * Control, an element of management accounting * Comptroller (or controller), a senior financial officer in an organization * Controllin ...

and

VoLTE Voice over LTE (VoLTE) is an LTE high-speed wireless communication standard for mobile phones and data terminals, including Internet of things (IoT) devices and wearables. VoLTE has up to three times more voice and data capacity than older 3G U ...

of the video service and uses LTE as the radio access medium. The service as a whole is governed by the

GSM Association The GSM Association (commonly referred to as 'the GSMA' or ''Global System for Mobile Communications'', originally ''Groupe Spécial Mobile'') is an industry organisation that represents the interests of mobile network operators worldwide. More ...

in PRD IR.94.

Mechanism

ViLTE uses the same control plane protocol as Voice over LTE (

), namely the Session Initiation Protocol ( SIP). The IMS core network along with the applicable Application Server ( AS) performs the call control. ViLTE uses the

H.264 Advanced Video Coding (AVC), also referred to as H.264 or MPEG-4 Part 10, is a video compression standard based on block-oriented, motion-compensated coding. It is by far the most commonly used format for the recording, compression, and distr ...

codec to encode and decode the video stream. The H.264 codec delivers superior quality as compared to the low bit rate

3G-324M 3G-324M is the 3GPP umbrella protocol for video telephony in 3G mobile networks. The 3G-324M protocol operates over an established circuit switched connection between two communicating peers. 3G-324M is an umbrella specification to enable conve ...

codec that is used in 3G conversational video calls. It is vital that ViLTE video calls are allocated appropriate

quality of service Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network, or a cloud computing service, particularly the performance seen by the users of the network. To quantitat ...

(QoS) to differentiate and prioritize this delay and jitter sensitive conversational traffic from other streaming video traffic that is not as delay or jitter sensitive. The mechanism used is called

QoS Class Identifier QoS Class Identifier (QCI) is a mechanism used in 3GPP Long Term Evolution (LTE) networks to ensure carrier traffic is allocated appropriate Quality of Service (QoS). Different carrier traffic requires different QoS and therefore different QCI val ...

(QCI). The ViLTE bearer traffic is typically allocated QCI=2, and the SIP-based IMS signalling QCI=5.

Devices

As of February 2019 the

Global Mobile Suppliers Association The Global mobile Suppliers Association (GSA) is a not-for-profit industry organisation representing companies in the mobile communication industry. GSA actively promotes 3GPP technology such as 3G; 4G; 5G. GSA is a market representation partn ...

had identified 257 devices, virtually all of them phones, supporting ViLTE technology. By August, continued momentum had seen the number of identified devices increase to 390. Many of the world’s largest handset vendors now have ViLTE capable devices on the market. As of August 2019, ViLTE devices were offered by 46 vendors/brands including Askey, BBK Electronics, Blackberry, Casper, Celkon, CENTRiC, Comio, Foxconn, General Mobile, GiONEE, HMD, HTC, Huaquin Telecom Technology, Huawei, Infinix, Infocus, Intex, Itel, Karbonn, Kult, Lanix, Lava, Lenovo, LG, LYF (Reliance Digital), Micromax, Mobiistar, Motorola, Panasonic, Reach, Samsung, Sonim, Sony Mobile, Spice Devices, Swipe Technologies, TCL, Tecno, Vestel, Xiaomi, YU (Micromax), Yulong Computer, Ziox, and ZTE. iPhones don’t support ViLTE.GSA
VoLTE & ViLTE: Global Market Update
August 2019

References

{{Mobile telecommunications standards LTE (telecommunication) Mobile technology Videotelephony

Mechanism

Devices

See also

References