If you have already used 4G, you will definitely find a problem, that is, the mobile phone instantly becomes a "double standby". It is obvious that there is only one SIM card. Why do you have two signals? At the same time, why is there no such treatment for the iPhone 5s in the 4G environment? It seems to be a simple signal problem, but behind it hides a secret that is not noticed.
Usually, most people don't think that there is anything worth talking about when calling the 4G era. After all, the speed is going straight to 100Mbps. Is it still a matter of phone? In fact, this problem has really ruined the operators, especially China Mobile. At the same time, it is exactly what seems to be irrelevant. It has made China Mobile almost lose its arms after 7 years of iPhone release, so this is really not a piece. Small things.
Although I don't want to describe this in a boring language, I still can't avoid the most basic problem, that is, 4G and 3G are really different in voice calls. Currently, 4G has three voice call solutions: dual standby. CSFB (Circuit Switched Fallback) and VoLTE (Voice over LTE), I try to put these three less technical.
Dual standby is well understood, that is, 4G and 3G/2G are on standby at the same time, 4G is used for Internet access, and 3G/2G is used for making calls. The standby effect is as mentioned at the beginning of this article. It seems that it is automatically upgraded to double standby overnight. mode. Because the two do not affect each other, the call effect and the use of the Internet are relatively smooth, and the problem of language calls is solved with a small investment in the early 4G. Therefore, most of the terminal mobile phones purchased by China Mobile currently adopt this solution. Program. But it is also because there are two sets of RF transmission systems inside the mobile phone, so the biggest problem is power consumption, and the standby and use time is significantly shortened. We have used one of the custom models for a long time. Under normal use, the 3100mAh battery actually stays less than one day, and its 3G model uses a similar capacity battery, the standby time is obviously much longer.
There is no perfect thing in the world. In many people's view, the high power consumption problem of dual standby mode is unacceptable. Therefore, quite a few manufacturers turn to CSFB, and the principle of this solution is very simple. Only one set of RF chip is used, and it will fall back to 2G mode (cannot access the Internet) during the call, and then resume to 4G/3G after the call ends. Obviously, this solution has only one set of RF chips, and the power consumption problem is well controlled, but the problem is coming...
The fatal point of CSFB is that it can't be restored to 4G/3G network very quickly after the call ends. The initial time difference is even as long as ten seconds. If you feel that it is not a big deal to use the network immediately after the call, then it is frequent. Dropping words is simply unacceptable. It can be said that CSFB is not mature compared to dual standby. It is also an expedient measure at the expense of user experience, but unfortunately, this is the iPhone 5s/5c. Solution, do you have a lot of fruit powder used in 4G, but this is the result?
If this is the case, then the iPhone 5s will not marry China Mobile at all. Although the marriage between the two is another story, they have at least contributed to the fact that CSFB, which was previously unacceptable, has been greatly optimized. If you pick up the iPhone 5s and make a call now, you will find that all the things I said before are idle - the call-off phenomenon is basically gone, and the network switching time after the call is only one second so short, it is not me. Moving in the black?
On the contrary, China Mobile is happy for both of them. Both schemes are used (actually all three are running, as will be mentioned later). Dual standby is the basic strategy. This has not changed, but in order to catch up for 7 years. The long-time "Goddess" iPhone 5s also debugged the base station and the background, so that the models using the CSFB solution can also have a more OK call effect, so that the CSFB phones are also dimmed with the iPhone 5s, even they are While achieving perfect call performance, it also has the advantage of power consumption compared to the dual standby type.
This is not the end of the matter. If you think about it, you will find that although the network speed has been upgraded to the 4G era of the 100M standard, the call is still using the 2G mode for more than 20 years. Regardless of the dual standby or CSFB, the standard is actually used. It is 2G. For ordinary users, this is not inconvenient. It is a big deal to bring a charging treasure. But for operators, it is very uneconomical to support two networks at the same time. It is like the Windows 8 system, which also supports a Windows 95 system in the Windows 8 era. In the long run, it is absolutely necessary to get rid of the lower and lower efficiency. 2G network, then the next role of the 2G "terminator" is the third option VoLTE.
If you haven't been fainted by me at this time, congratulations, you have already seen the biggest dawn of the 4G era. For operators and users, the ultimate goal is to have only one network, that is, to allow voice calls to run in a 4G network environment. This is not a simple matter, and this difficult task falls on VoLTE.
The most direct feeling that VoLTE brings to users is that the connection waiting time is shorter, and the call quality is higher and more natural. VoLTE is essentially different from 2G and 3G voice calls. It is an end-to-end voice solution based on all-IP conditions on 4G networks. Compared with 2G and 3G voice calls, it can increase by about 40% because it uses high-resolution editing. Decoding technology. In addition, VoLTE brings lower access latency (waiting time after dialing), which is 50% lower than 3G, about 2 seconds, and 6-7 seconds in the 2G era. In addition, the drop condition at 2G and 3G has occurred, but the drop rate of VoLTE is close to zero.
Although VoLTE sounds great, we can't experience it in a short time. This technology can only be fully set up after the 4G network is very popular, and the coverage rate reaches a very high level. Otherwise, even when there is no 4G network, even the most basic telephones will not work. This situation will be terrible and unimaginable. Before 4G has not been popularized as high as the fixed line, it can still be called only by dual standby or CSFB.
However, with the rise of IM tools such as WeChat and the changes in people's communication methods, pure voice calls seem to be gradually being replaced by multimedia three-dimensional communication. Perhaps when VoLTE is popular, people have already replaced it in other ways. This simple to dispensable single function. But in any case, "calling" in the 4G era is not an easy task.
Finally, we will inevitably have to look at the purchase of 4G mobile phones. In general, the products with dual standby are obviously more than CSFB. After all, this is the main push plan of China Mobile. There are more than a dozen models on the market, and they are still increasing, but their shortcomings are obvious. That is, the power consumption is too large. If you can't stand it and look for the CSFB model, you will find that in addition to the Apple iPhone 5s/5c, only a few mobile phones from domestic manufacturers such as Huawei are available. Therefore, from the terminal, if you are a "fruit powder" then you will definitely take CSFB to talk, if not the basic "double standby" users, so there is basically no choice for users in this matter.
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