VoLTE(Voice over LTE;보이스 오버 엘티이)란?

제4세대(4G) 이동통신 방식인 롱 텀 에벌루션(LTE)방식을 이용하는 음성 서비스.

 LTE는 올아피(All IP) 방식으로 음성과 데이터의 구분이 없어지기 때문에 VoLTE 서비스가 나오면 음성과 데이터로 나뉜 지금 요금 체계에도 새로운 변화가 일어날 전망이라고 하네요

 사실 음성통화를 인터넷 신호로 전송하는 기술은 공짜 음성통화를 위한 기술로 널리 알려져 있다고 하네요.

 스카이프나 국내 주요 포털회사들이 내놓은 무선인터넷전화(mVoIP) 서비스들이 바로 VoLTE와 같은 기술이라고 하네요.

 　그러나 이동통신 회사들이 VoLTE 서비스를 공짜로 제공할 계획은 없다고 하네요.ㅠㅠ

 이 때문에 일반 소비자들 사이에 '공짜'라고 인식돼 있는 인터넷전화 기술에 대해 새로운 서비스를 추가해 소비자들이 요금을 낼 수 있는 차별적 서비스로 이미지를 바꾸는 게 VoLTE 상용화 성공을 가르는 관건이 될 것으로 보인다고 하네요.

 
This article is about the dressage training technique. For the Renaissance dance, see Lavolta.
The volte is a very small circle that is used in the training of a horse. Of all the circles, it requires the most balance from the horse. Voltes are excellent training tools, encouraging engagement and power.

Voice calls
The LTE standard only supports packet switching with its all-IP network. Voice calls in GSM, UMTS and CDMA2000 are circuit switched, so with the adoption of LTE, carriers will have to re-engineer their voice call network. Three different approaches sprang up. Most major backers of LTE preferred and promoted VoLTE (Voice over LTE, an implementation of IP Multimedia Subsystem or IMS) from the beginning. The lack of software support in initial LTE devices as well as core network devices however led to a number of carriers promoting VoLGA (Voice over LTE Generic Access) as an interim solution.[19] The idea was to use the same principles as GAN (Generic Access Network, also known as UMA or Unlicensed Mobile Access), which defines the protocols through which a mobile handset can perform voice calls over a customer's private Internet connection, usually over wireless LAN. VoLGA however never gained much support, because VoLTE (IMS) promises much more flexible services, albeit at the cost of having to upgrade the entire voice call infrastructure. VoLTE will also require Single Radio Voice Call Continuity (SRVCC) in order to be able to smoothly perform a handover to a 3G network in case of poor LTE signal quality.

While the industry has seemingly standardized on VoLTE for the future, the demand for voice calls today has led LTE carriers to introduce CSFB (Circuit Switched Fallback) as a stopgap measure. When placing or receiving a voice call, LTE handsets will fall back to old 2G or 3G networks for the duration of the call.

LTE CSFB to GSM/UMTS network interconnects

Full-HD Voice
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.[21] Where previous cell phone voice codecs only supported frequencies up to 3.5 kHz and upcoming HD Voice services up to 7 kHz, Full-HD Voice supports the entire bandwidth range from 0 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.