Will ordinary users care about what volte is and how it is going? NO! However, some 2G / 3G users are worried about whether the operator’s frequency reduction and network withdrawal will affect their ability to make calls and surf the Internet. The focus behind this involves 4G voice volte. In short, volte will make your call and Internet experience better. But in the 4G era, volte is not developing fast.

According to the definition of 3GPP standard, 5g voice (vonr) still uses the 4G voice architecture and also provides voice services based on IMS. However, due to the insufficient initial coverage of 5g and different choices for SA / NSA, the initial voice of 5g will fall back to volte. After the 5g coverage is improved, vonr will be launched and higher definition codec technology will be adopted to further improve the voice quality and experience.

In other words, volte really blooms in the 5g era and should play the role of the main force. However, there are still some challenges and problems to be solved before we really move towards the glorious moment.

The first is network coverage. Network is the premise of supporting volte. By the end of June this year, China’s 4G users had reached 1.23 billion, accounting for 77.6% of mobile phone users. 4G penetration rate has been very high. However, 2G and 3G networks are still not closed, which will lead to the failure of some frequency bands, and the 4G and 5g network coverage will also be affected. Therefore, 2G / 3G withdrawal should be accelerated.

Secondly, terminal support. Terminals are the bearer of high-quality experience, but they need volte enabled terminals. At present, there are still few types. It is reported that China Mobile has achieved full coverage of volte terminals. For China Telecom, as early as the end of last year, there were more than 227 all Netcom mobile terminals supporting its volte, and 4G all Netcom terminals listed after April 1, 2018 generally support China Telecom volte.

China Unicom is relatively few. At present, only some models of Huawei, glory, Xiaomi, vivo and Samsung have supported China Unicom volte. All Apple terminals have been upgraded to support the opening of volte before December this year. Third, interconnection. If the volte of the three major operators can realize interoperability across the country, it can accelerate the conversion of 2G and 3G users to 4G. In this way, the 2G and 3G network withdrawal speed will be faster and the spectrum utilization will be improved.

At the beginning of this year, the Ministry of industry and information technology issued the IMS network interconnection pilot implementation plan: the IMS network interconnection pilot provinces are Hunan Province and Sichuan Province; The pilot business scope includes basic language service, supplementary service, point-to-point video call, RBT and teleconference; The pilot period is one year. China Telecom and China Mobile are the first to participate in the pilot, and China Unicom will participate in the pilot when the conditions are met.

Hunan Mobile dialed the first IMS inter network call to Hunan Telecom, which marks the phased achievements of Hunan IMS interconnection project. Next, the project will enter the service test stage. After the system is put into trial operation, the call quality between networks will be greatly improved, the types of inter network services will be richer, and the user communication network experience will be improved. I believe that after these three problems are solved, volte will begin to be fully commercial.

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