Explanation:
4G+ is an extension of 4G network standard, formally known as advanced Evolutionary version of 4G network standard.
Compared with 4G network, 4G+ mainly increases the support of carrier aggregation technology and VoLTE HD voice calling function. In some scenarios supported by both operators and mobile phones,the network speed can be multiple improved and the delay of mobile phones can also be reduced.
The new VoLTE HD voice calling technology allows calls to be dialed and transmitted over a data network, allowing you to connect to the Internet while making a call, with better call quality and shorter wait times.
Function Introduction:
VoLTE is just Voice over LTE, which is a kind of IP data transmission technology. Without 2G/3G network, all services are carried on 4G network, which can realize the unification of data and Voice services under the same network.In other words, 4G provides not only high-speed data but also high-quality audio and video calls, which require VoLTE technology.
VoLTE is fundamentally different from 2G and 3G voice calls.VoLTE is an end-to-end voice solution built on a 4G network with full IP environment.The VoLTE improves voice quality by about 40% over 2G and 3G voice calls because it uses high-resolution codec technology. VoLTE gives users a much lower access delay (wait time after dialing), 50% lower than 3G, around 2 seconds, compared to 6-7 seconds in 2G.In addition, the dropout rate under 2G and 3G occurred some time, but VoLTE's dropout rate was close to zero.
Notes:
1. VoLTE technology uses data traffic to transmit during calls, and adopts a new algorithm, which significantly improves the call quality and completely solves the problem of call network switching delay in CSFB technology.
2. Since VoLTE requires comprehensive support and optimization of terminal, wireless and core networks, it is difficult and complex to realize at present, and it is expected that VoLTE will not be effectively utilized and promoted in a short time.In other words, the CURRENT 4G network we use can only carry the data service, while the voice service still needs the support of 2G/3G network.