Apple fans have been posting a lot of comments on VoLTE on their WeChat Moments. What exactly is it?
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Some time ago, Apple and China Mobile pushed an operator file to iPhone 6/6s (Plus) users, which triggered a wave of discussion about VoLTE. At the Xiaomi 5 mobile phone launch conference, Lei Jun also mentioned a "VoLTE". VoLTE is a seemingly high-sounding word. Telecom operators, mobile phones, and chip manufacturers all promote VoLTE as a selling point service and function. So what is this VoLTE? What is VoLTE? VoLTE is the abbreviation of Voice Over LTE in English. It literally means that audio is transmitted through the LTE network. From this, 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, we must first understand the basic principles of mobile phone networks. At present, mobile phone networks are actually divided into circuit domain and 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 have begun to merge. Circuit domain services will be added to the packet domain for transmission, that is, voice is transmitted through the Internet access channel. VoLTE is the voice service after the fusion 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 voice call services are the highest priority in the entire LTE network, so VoLTE has the advantages of better call quality, stronger stability (QoS), and no traffic fees. When the three major domestic operators began to deploy 4G networks, due to technical and network coverage limitations, they did not directly launch VoLTE to take over voice services, but adopted the CSFB solution (also used dual standby solutions) to allow 4G mobile phones under the LTE network to fall back to the 2G/3G network during calls. It was not until the 4G networks of the three operators have been mostly popularized that the commercial VoLTE service began. What are the benefits of VoLTE? Because VoLTE uses a data network, it can carry more information than the previous voice lines. VoLTE's voice audio reaches the HD voice call quality of 16kHz sampling, and can reach the highest Full-HD voice of 20Hz-20kHz sampling. The parameters seem to have improved a lot, so what is the actual effect? Since China Unicom started to promote HD Voice service under 3G network at the end of last year, the HD Voice service happened to use the same 23.85kbps ARM-WB audio as China Mobile VoLTE, so we were able to experience VoLTE HD Voice service in advance. According to my personal experience, the voice quality in the past was similar to that of mono FM radio, and the sound was dull, while HD Voice has a better sense of space, and some lip sounds and dental sounds can be distinguished. Unicom mobile phone users who have the conditions can try it by themselves. The improvement of call quality and stability is very meaningful for salesmen, family members, and couples who need to contact each other frequently by phone. I remember that I saw a mobile phone advertisement before, in which a couple misunderstood each other because of the poor quality of mobile phone calls. No one wants their loved one to be hoarse on the other side of the phone, but they can't hear their true words clearly, right? I believe that VoLTE can make everyone feel as if the other person is right next to them when they are talking, and their hearts are closer to each other. In addition, under VoLTE, the time it takes to dial a phone call is significantly shortened. After entering the number and pressing the dial button, it only takes about two seconds to connect (referring to hearing a beep or ringtone), while non-VoLTE takes 5-6 seconds or even longer (the system and hardware will also affect it). When promoting VoLTE, China Mobile said that mobile phone users can also surf the Internet while talking on the phone in the future. Some netizens also said that when playing mobile online games, there will be no disconnection when a call comes in. This is because the VoLTE network can carry out data and calls at the same time (China Unicom users can ignore this). In addition to providing high-definition voice calls, major operators also mentioned high-definition video calls, and the two can be switched directly during a call. This high-definition video call is actually ViLTE (Video over LTE), which also controls and transmits video data through IMS services and LTE data networks, but the operators have made unified promotions. Which mobile phones does VoLTE support? There are actually many mobile phones on the market that support VoLTE technology. Many models actually support this technology (IMS protocol stack) in hardware, but due to problems with operators and mobile phone software, this function cannot be activated. , G3, G4, G5 Microsoft: Lumia 950/950XL, Lumia 640 and other Lumia phones that support Windows Phone 8.1 and above. How to activate, use and cost of VoLTE? Currently, China Mobile and China Unicom, the three major domestic operators, have started trial operation of VoLTE. Some time ago, iPhone 6/6s users received VoLTE push files from domestic operators. China Mobile 4G users can go to the business hall to activate the service if their phones support VoLTE. China Unicom users have VoLTE activated by default. The above is the situation in Guangzhou. Due to different activation methods of operators in different regions, users in other regions need to consult the local 10086/10010 hotline. After activating the VoLTE service on the operator's side, iPhone 6/6s (Plus) users also need to go to Settings-Cellular Data Mobile Network-Enable 4G and select Voice and Data (China Unicom users select 4G). There are many types of Android phones and it is impossible to explain them uniformly, but most of them check the VoLTE option in the settings or notification bar. Since VoLTE is based on data traffic, if it is calculated based on traffic, I believe everyone is ready to sleep on the street. Therefore, it is understood that the package provided by China Mobile will give 100 minutes of voice call time for free every month, and the fee will be calculated by the number of minutes after exceeding the limit. According to this statement, everyone does not have to worry about extra charges for VoLTE, and can just keep using it now. Mobile phones that have opened VoLTE can still make calls with ordinary 2G/3G mobile phones and fixed phones, but high-definition voice cannot be achieved. When the VoLTE network reaches a VoLTE-free network environment, SRVCC technology will help users automatically switch back to ordinary voice calls, and users do not have to worry about disconnection. As for VoLTE calls between operators, it is not possible at present. It will take one to two years for VoLTE to be fully popularized in China like GPRS and 3G in the past. When people choose new mobile phones, they have not yet reached the point where "mobile phones that do not support VoLTE cannot be used", but this year, if mobile phone manufacturers do not make VoLTE a must-have function for new mobile phones, it would be irresponsible. As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity. |
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