What is mobile HD

"HD" represents volte high-definition voice call technology. When the "HD" icon appears on the mobile phone, it means that the user has turned on the "VoLTE high-definition voice call" function. This function is provided by communication operators, but users You can turn this feature off or on at your own discretion. The "HD" function has two functions: one is to ensure that users are not disconnected from the mobile data network during calls; the other function is to provide a more stable environment for users' calls.

The operating environment of this tutorial: HarmonyOS 2 system, HONOR V30 mobile phone.

When many users use their mobile phones, they find that the "HD" icon is displayed on the top of the mobile phone screen. They don't know what it means and what it represents. Let's talk about what it does.

"HD" stands for volte high-definition voice call technology. Compared with traditional call technology, this call technology has the advantages of faster answer, clearer call voice, and low call drop rate. Moreover, this call technology The technology also supports using the data network while making calls, which means that you can answer calls without being connected to the Internet.

#What does "HD" mean when it appears on your phone?

The so-called "HD" icon can be understood as a certain "communication standard". When the "HD" icon appears on the mobile phone, it means that the user has turned on the "VoLTE high-definition voice call" function. This function It is provided by communication operators, but users can turn off or turn on this function at their own discretion.

# Turn on the "HD" function, what is it used for?

Its use is either big or small. As mentioned in the previous article, when the "HD" icon appears, it means that the user has turned on the "VoLTE high-definition voice call" function. This function It has two functions: one is to ensure that the user does not disconnect from the mobile data network during the call; the other function is to provide a more stable environment for the user's call. In the 2G and 3G era, due to technology, equipment, and network limitations, call networks and mobile data networks often could not coexist. However, with the emergence of VoLTE technology, this problem has been perfectly solved. solved this problem.

Introduction to volte high-definition voice call technology:

is a high-speed wireless communication standard for mobile phones and data terminals. It is based on the IP Multimedia Subsystem (IMS) network and uses specially tailored profiles (defined by the GSM Association in PRD IR.92) for the control plane (Control plane) and the media plane (Media plane) of voice services on LTE. Enable voice services (control and media layers) to be transmitted as data streams in the LTE data bearer network, without the need to maintain and rely on traditional circuit-switched voice networks

## Advantages of #volte high-definition voice call technology:

VoLTE is an end-to-end voice solution based on all-IP conditions on the 4G network. Compared with 2G and 3G voice calls, VoLTE can improve voice quality by about 40% because it uses high-resolution codec technology. VoLTE brings users lower access latency (waiting time after dialing), which is 50% lower than that of 3G, about 2 seconds, while it was 6-7 seconds in the 2G era. In addition, under 2G and 3G, call drops occur from time to time, but the call drop rate of VoLTE is close to zero.

Another value is to improve user experience. The VoLTE experience is obviously better than traditional CS voice. First, the introduction of high-definition voice and video codecs has significantly improved communication quality; second, the call connection time of VoLTE has been greatly shortened, and tests have shown that VoLTE is more than half shorter than CS calls; third, seamless integration with RCS can bring a wealth of business.

The development of volte high-definition voice call technology:

The first stage: LTE hotspot coverage hotspots, pre-VoLTE applications appear. In the early stage of LTE, hotspot coverage is the main focus, mainly for Mobile broadband data applications such as data cards and tablets, but some early LTE voice applications will also appear.

The second stage: LTE area continuously covers the area and enters the development period of VoLTE. In this stage, operators expand the LTE coverage level and meet the conditions for operating voice services, especially in cities and densely populated areas; , the emergence of a large number of LTE smartphones has promoted the development of VoLTE.

The third stage: LTE full coverage, VoLTE becomes mainstream application. At this stage, LTE coverage has reached a very complete level, or LTE and other wireless broadband technologies such as HSPA form a seamless network, making mobile broadband voice applications become mainstream. , traditional CS will be gradually replaced, of course, this is a quite long process.

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