I believe 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, which is called “Voice over LTEâ€. It can be understood as a “voice technology transmitted over LTE networkâ€. So, what are the VoLTE voice technologies, which classifications are based on 4G LTE voice calls, what are the various voice call services and technical processes, let the small series give you a detailed explanation.
What is VoLTE voice technology?
VoLTE is the abbreviation of English Voice Over LTE. The literal translation is that audio is transmitted through the LTE network. It can be seen that this is a voice technology. VoLTE is based on IMS services and 4G LTE networks. Before further explaining the principles of VoLTE technology, it is necessary to understand the basic principles of mobile phone networks.
At present, the mobile phone mobile network is actually divided into circuit domain and packet domain. The circuit domain is responsible for voice and short message communication, and the packet domain is responsible for data access. However, with the development of 4G network, these two domains begin to merge, and circuit domain services will be added. The packet is transmitted on the packet domain, that is, the voice is transmitted through the Internet access channel, and VoLTE is the voice service after the integration of the two domains.
In general, VoLTE is actually using your data traffic to make calls, which is similar to VoIP phones such as WeChat voice, FaceTIme, Skype, etc., but VoLTE is 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, more stability (QoS), and no traffic.
When the three major operators in China began to deploy 4G networks, due to technical and network coverage restrictions, they did not directly take over VoLTE to take over voice services. Instead, they adopted the CSFB solution (also useful for dual-standby solutions), allowing 4G mobile phones under LTE networks to When the call fell back to the 2G/3G network, until now the 4G networks of the three operators have become popular, and the commercial VoLTE service began.
Because VoLTE is a data network, it can carry more information than past voice lines. VoLTE voice audio reaches 16 kHz sampling HD voice call quality, and can go to 20 Hz-20 kHz sampled Full-HD voice. It seems to improve a lot, so the actual effect?
Since China Unicom began to implement the HD Voice service under the 3G network at the end of last year, the HD voice service used the same 23.85 kbps ARM-WB audio as the mobile VoLTE, so that the VoLTE HD voice service could be experienced in advance. According to Xiaobian's personal experience, the past voice quality is similar to the mono FM radio, the voice is dull, and the high-definition voice is more spatial, and some lip sounds and tooth sounds can be distinguished. The qualified Unicom mobile phone users can Try it yourself.
The improvement of the sound quality and stability of the call is very meaningful to the salespersons, family members and couples who need to contact the phone frequently. I remember that Xiaobian had seen a mobile phone advertisement before, and a pair of lovers misunderstood each other because of the poor quality of the mobile phone call. Everyone doesn't want their beloved ones to scream on the other side of the phone, but they can't hear their true words? I believe that VoLTE allows everyone to talk as if they are next to each other, and their hearts are closer.
In addition, under VoLTE, the dial-up time of the mobile phone is significantly shortened. After the input number is pressed and dialed, it only takes about two seconds to turn on (refer to hear a beep or ring tones), instead of VoLTE, it takes 5-6 seconds. Even longer (systems, hardware will also affect).
When China Mobile promoted VoLTE, it said that mobile phone users can also access the Internet during the call. Some netizens said that playing mobile phone games in the future will not cause the game to be disconnected. This is because the VoLTE network can simultaneously perform data and call. (Unicom users can ignore this one).
VoLTE can provide high-definition voice calls. The major operating businesses also mention high-definition video calls, and the two can directly switch between calls. This HD video call is actually ViLTE (Video over LTE), also through IMS service and LTE data. The network controls and transmits video data, but the operators have made a unified publicity.
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