I believe that many people have heard of the term VoLTE voice, but due to the current development of domestic technology, many cities have not fully popularized VoLTE voice. It is reported that VoLTE is a 4G high-definition voice / video communication service launched by mobile operators. It is called "Voice over LTE", which can be interpreted as a "voice technology transmitted through LTE network". So, what is VoLTE voice technology, what are the classifications of voice calls based on 4G LTE, what are the various voice call services and technical processes, let the editor explain to you in detail below.
What is VoLTE voice technology?
VoLTE is the abbreviation of Voice Over LTE in English. Literal translation means that audio is transmitted through the LTE network, which can be seen as a voice technology. VoLTE is based on IMS services and 4G LTE networks. Before further explaining the principles of VoLTE technology, we must first understand the basic principles of mobile phone networks.
At present, the mobile phone network is actually divided into a circuit domain and a packet domain. The circuit domain is responsible for voice and SMS communications, and the packet domain is responsible for data Internet access. However, with the development of 4G networks, these two domains start to converge, and the circuit domain business will join Transmitted in the packet domain, that is, voice is transmitted through the Internet channel, VoLTE is a voice service after the integration of the two domains.
In layman's terms, VoLTE is actually using your data traffic to make calls, which is similar to VoIP network calls such as WeChat Voice, FaceTIme, Skype, etc., but VoLTE uses a dedicated channel on the mobile data network, and the voice call service is The entire LTE network has the highest priority, so VoLTE has the advantages of better call quality, stronger stability (QoS), and no traffic charges.
When the three major domestic operators began to deploy 4G networks, due to technical and network coverage limitations, VoLTE was not directly launched to take over voice services, but the CSFB scheme (also a dual standby scheme) was used to allow 4G mobile phones under LTE networks to During the call, it fell back to 2G / 3G network. Until now, the 4G networks of the three operators have been mostly popularized, and commercial VoLTE services have not begun.
Because VoLTE is a data network, it can carry more information than voice lines in the past. VoLTE voice audio reaches the quality of 16kHz sampled HD voice calls, up to 20Hz-20kHz sampled Full-HD voice, parameters It seems to have improved a lot, but what about the actual effect?
Since China Unicom launched the HD Voice service under the 3G network at the end of last year, it happens that the high-definition voice service uses the same 23.85kbps ARM-WB audio as the mobile VoLTE, so that it can experience the VoLTE high-definition voice service in advance. According to the personal experience of the editor, the voice quality in the past is similar to that of mono FM radio, and the sound is dull, while the high-definition voice is more spatial, and some lip and tooth sounds can be distinguished at the beginning. Conditional Unicom mobile users can Try it yourself.
The improvement of call sound quality and stability is of great significance to salespersons, family members, and couples who need to make frequent phone calls. I remember that I have seen a mobile phone advertisement before, and a pair of lovers misunderstood each other because of the poor phone call quality. Everyone doesn't want their beloved to scream on the other side of the phone, but they can't hear their true words? Believe that VoLTE can make everyone talk as if the other party is beside them, and their hearts are closer.
In addition, under VoLTE, the phone dialing time is significantly shortened. After entering the number and pressing to dial, it only takes about two seconds to connect (meaning a beep or color ring back tone), while non-VoLTE takes 5-6 seconds. Even longer (system, hardware will also affect).
When promoting VoLTE, China Mobile said that in the future, mobile phone users will be able to surf the Internet during a call, and some netizens said that after playing mobile online games, incoming calls will not cause the game to be disconnected. These are because the VoLTE network can do data and call at the same time. (Unicom users can ignore this).
VoLTE can provide high-definition voice calls, and major operating businesses also mentioned high-definition video calls, and the two can be directly switched during the call. This high-definition video call is actually ViLTE (Video over LTE), also through IMS services and LTE data The network to control and transmit video data is only a unified promotion by the operator.
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