4G 10 things you must have no idea

你们天天说4G，月月说4G，我家怎么就一直没信号?也不是荒山野岭难道被抛弃了?累觉不爱啊!另外，4G那么快的网速到底干啥最爽?一定要去营业厅换卡吗?我买到的所有4G手机速度都一样快吗?

In the early 4G popularization, a lot of people have a variety of problems, for some high degree of concern, or tricky problems, we deliberately carried out the field test, and consult relevant senior personage, for everyone to make authoritative answer.

　　1, my home does not have 4G signal--don't worry, is running with 2-3 square kilometers of coverage speed every day

4G no matter how fast the speed, no signal is in vain. I believe that I have handled 4G business, or have recently visited our small partners have probably learned about the coverage of the 4G signal, the official said in Beijing, the current coverage is about three east, west and north of the three-ring area, the south only to reach Guangdong and Guangxi Road, but also CBD, Zhongguancun and Tsinghua University and other key areas. And according to a number of users of the test, and Tencent digital field experience, indicating that the current 4G signal coverage has been far beyond the region, in many directions have reached the area within the five rings.

In fact, when we told the Beijing mobile related to know that the 4G construction speed is very fast, only a little conservative publicity, because it is still in the early stages of development. In the current construction, every day will be opened 30 new base stations around, cover 2-3 square kilometers of area, so if you are enthusiastic about when your home can have 4G signal, no matter how remote also do not give up waiting, perhaps you see this article, you will be pleasantly surprised to find that can be in the 4G high-speed road bolted.

　　2, the subway/station have no signal, cover where to go?—— this thing you may have to ask the Subway/property

I was just saying that the 4G signal was covered to three rings/five rings, but I was in the city center by subway or office, how can I have no signal? Actually, no signal. This is more complicated, especially in the Royal Park of Beijing.

One situation may be that there are too many people around, the instantaneous flow request is very large, causing you to be "squeezed down". And the other one we want to focus on the situation, is really no signal, the mobile phone is showing 3G or even 2G, then it is likely that the base station around you did not upgrade to 4G.

Generally speaking, because the 4G is characterized by low power, high density, so the signal can penetrate at most 2-3 wall, then the subway or indoor is very likely to have no signal, this time the operator will go to set up a separate indoor system, each distribution system requires complex wiring, This construction will require a subway or property approval, then the next thing can be imagined. In addition, the mobile signal into the subway, but also need operators and the MTRC in the admission fee, operating maintenance costs and other aspects to reach a consensus.

So far, we have tested that no underground subway line can search for 4G signals, which makes us think of the Beijing Line 10 line (North Line) has not yet unicom 3G signal, imagine the difficulty of construction and how much resistance. So to cover these underground/indoor areas, it is estimated that more is a "wait" word.

　　3, the high-speed rail is to be able to call, the result is intermittent--railway base station is no longer dense and useless, speed is the biggest killer

We've had some experience before the high speed rail coverage, in just out of the station and the situation in the urban area is basically good, into the suburbs, especially after the increase in speed, in addition to the Beijing-Tianjin high-speed rail (average download speed up to 20Mbps), the 4G signal Basic No, and even the internet is impossible, and when the train into 300 kilometers per hour , the phone to see luck, do you want to take the high-speed train like flying in a daze sleep?

We learned from the relevant industry that, in fact, the biggest difficulty in 4G construction lies in high-speed rail, because of the characteristics of 4G itself and high-speed rail speed of 300 kilometers of ultra-high speed, so that every 800 meters must have a base station, despite this, the highest speed of high-speed rail, 83 meters per second forward, It will pass through a base station in less than 10 seconds, so when you talk about a phone call, you may have switched to dozens of base stations, and this time the disconnection is very likely to happen.

So for those of us who often use high-speed rail, we propose to call or surf the internet after a slow or urban entry, which will not only provide a relatively stable signal, but also reduce the power consumption and radiation of the mobile phone.

As for the attenuation of the 4G signal, the faster the speed will be slower, and when more than 200 kilometers per hour, the speed of the Internet will fall very clearly, so in the high-speed rail when still enjoy the scenery outside the window.

　　4, my licensed iphone 5s was abandoned by 4G?—— use 4G is only a matter of time

A while ago the iphone 5s/5c with China Mobile 4G network of things stir, a time Business Hall cut card sound, but a lot of small partners to go after the disappointment and return, because only the port version of the iphone 5s/5c can be 4G "lucky", a time licensed, American version of the user dejected. The little fellows raised their heads, and the good news came!

In fact, we saw in the iphone 5s disassembly that it used a high-pass mdm9615m baseband chip, a "secret weapon" that was hidden from the iphone 5 era, which supports LTE (FDD and TDD), hspa+, ev-do version B and TD-SCDMA, GSM, and other formats , the legendary 5-mode 11-frequency chip, so in principle, the world's iphone 5s can support China Mobile 4G (TDD), the difference is that Apple in different regions "artificially" to lock some frequency bands, so there will be different versions of the model, but they are in the hardware, In particular, there is no difference on the base belt.

The current operator of the "unlock" method is to let the port version of the iphone 5s/5c in a roaming state, so that can "cheat" system to open TDD format. and other versions of the iphone 5s/5c can also use this method to activate the 4G, just time and maturity of the problem, so everyone should not be too anxious. At the same time, we also boldly predict that the IPhone 5 can also be used 4G, please crack the great God's efforts.

　　5, 4G What's the best thing to do? Watch the video?—— wrong, to see live broadcast

Many people think that the killer application of 4G era is not online video, in fact, in mobile insiders, this application for 3G speed is "pediatrics", even with 4G to see high-definition online video, but also is overqualified, really can reflect the 4G advantage (that is, the most test speed) the application is actually live.

For online video, Network speed as long as the maintenance in 1.6-2.4mbps can be carefree to watch, if the 4G environment, because the theoretical speed of up to 100Mbps, so you can cache a few minutes or even more than 10 minutes of video streaming, and this time even in the base station switch to lose the signal or cause the speed drop, can still load the cache to watch, until the search to the next Base station, so for online video, a smooth and seamless viewing experience should be the biggest advantage of the 4G era.

But for live broadcast is completely different, this application requires 48Mbps bandwidth requirements, the current only 4G speed to meet, it and online video is essentially different, so the 4G era change the largest category of application scenarios, should be the main live broadcast.

　　6, the use of 4G mobile phones are "tyrants" it?—— not all 4G mobile phone speed is the same as fast

If you have the spirit of the geek, I believe will be willing to play 4G speed to the extreme, but the same standard 4G mobile phone, speed is all the same? believe that this is every geek or even ordinary users of the problem, because this is related to 4G mobile phone to buy the fundamental problem.

According to the Tencent digital this period of continuous 4G test, in the same area of a number of "run speed" test, including Sony m35t, Huawei G716, Samsung 7108D and other mobile phones, including the first 4G products, uplink/downlink speed are almost the same, only Huawei D2 LTE version is significantly higher than other opponents, So what's the difference between these products?

To the insider after we learned that, currently has td-lte chip production qualification manufacturers include Qualcomm, MediaTek, Core, exhibition, HiSilicon, and so on, most of them are using Qualcomm 28nm process chip, and the future of domestic thousand 4G mobile phones are mainly using MediaTek chip, One of the more special is the independent research and development capabilities of Huawei, its D2 mobile phone has been using HiSilicon k3v2 four core processor, the LTE version D2 also implanted HiSilicon 4G chip. Compared to several other products using Qualcomm chips, the LTE version of the D2 implanted in the 4-class chip, the theory has a faster network access capabilities, so in the actual performance of different responses.

In our actual test, the LTE version of Huawei D2 and other 4G mobile phones can be faster than the speed of 20-30%, in this regard, domestic chip has been in the front. Of course, there are a number of factors to consider a chip, speed is only one side, stability, compatibility and calorific value need comprehensive consideration. But here we just want to tell 4G users the truth: Not all 4G phones are as fast as they are.

　7, since do not change the number, why to change the card?—— Usim card encryption knowledge

For you impatient small partner, with 4G the most is not urgent is to change the card, regardless of whether you run to the Business Hall queue or waiting for mailing, is a long process, then why must change the card to use 4G?

For our average user, the SIM card seems to be useful in addition to storing phone and text messages (phones and text messages are rarely in the SIM card). and carefully observe the replacement of the Usim card can be found, the chip part of the larger area, is it expansion? To store more information?

In fact, the SIM card is very important role is identity, so it must have the function of encryption, to ensure that identity privacy is not stolen, and in the 4G era, Usim card to assume a higher level of encryption, which means more security, more difficult to be cracked.

For example, the X-Net has a lot of SIM card replicators, and we get a lot of spam messages every day. "Want to know his/her phone secret?" copy a card for you that is the same as his or her ", in fact this is in the Crack + copy SIM card, for the previous SIM card, this process may take several 10 minutes, Still able to wait, but the use of new encryption features of the 4G Usim card, even if the use of such violence to crack the way, the time spent is totally unbearable, so we still go to the business Hall for a unique Usim card, privacy security is very important.

　8, a lattice signal is also very fast--the truth is: 4G Network, the number of mobile phone signal has no meaning

This may be a more subversive concept, in the 4G network, mobile phone signal meaning is not significant.

Users who have experienced 4G mobile phones may have discovered the fact that, even in the lowest signal, the speed is still very fast. According to our test, if the full grid signal state, download the average speed of 48.8Mbps, then in a single signal intensity, can also have 12Mbps download average speed, so that seems to be unscientific, because whether to 5 or 4 lattice count as an example, should not get the results of this ratio, then the truth is what? ?

To this end, we have consulted the operators of professional people, in fact, in the 4G network, the signal strength on the phone has lost its meaning, although we can say that the full grid signal will be faster than a grid of the Internet speed, but there is no strict series of points, to the signal strength of the phone to estimate the speed is very inaccurate, How to mark the signal strength and speed in the 4G era is a small problem that is bothering the operators.

　　9, the speed of the Internet, is my base station here special to force it?—— the truth is, you might not be around 4G.

Although each place 4G speed is not the same, or even the difference is very different, but do not think that this is the inherent differences in the construction of the base station, the actual situation is likely--the internet slow place more people online, and the fast speed of the place almost no one to use.

According to our field test, such as the revival of the door, trade such hot spots, 4G speed is generally maintained at 16Mbps, slightly lower than the city's 4G downward mean, and the southwest four ring outside the region, but often can connect to 64Mbps 4G network, it is very surprising.

But according to the operator's explanation, this is not the network base station what is the difference, but by the number of people on the Internet at the same time to decide, the more the number of Internet speed will be slower, and the above revival door, international trade and so on certainly belong to this situation. Therefore, for operators, in the initial universal coverage of the task completed, the next stage will be "capacity-building", that is, increase the base station density of hot spots, such as in the urban hotspot area to reach a base station of 300-400 meters high density, which can effectively improve the speed of the same time online, Make the 4G experience faster and smoother.

So here we want to remind you that 4G speed will experience the "roller coaster" general fluctuations-in the early days of business, speed should be more ideal, because the use of people are not much, and as time goes on, the speed may experience turbulence, because this time access to more people, and the base station construction has not keep up; But with the large-scale growth of users, operators will take the expansion of construction, development to this period, the speed will have a stable rebound, because this time the number of users and speed are relatively stable.

　　10, download speed so fast, upload why very slow?—— total, but will adjust on demand

The previous speed overall unhappy, so very few people pay attention to upload rate, in fact, this aspect is precisely the 4G speed increase the most obvious place. Although in most cases, such as browsing the web, watching movies, listening to music, playing games, using the download service, but in which you will inevitably occur data interaction, so the upload behavior is there, but not so high-speed demand. But with the increase of mobile interconnection, especially since the rise of media and video sharing, uploading speed is becoming more and more important, such as uploading photos, voice, video and so on, which requires faster upload speed.

And in the test we found that the 4G mobile phone download speed may have a larger fluctuation, but the upload speed is relatively stable at 8Mbps or so, although this value has been quite considerable, but we still want to ask why there is such a setting?

According to the explanation of the operator insiders, upload and download the total speed is fixed, and their respective speed is the relationship between the two, that is, at the base station that end, upload speed set fast, download speed will be correspondingly slower, the current network downlink and uplink network resources ratio is 3:1. At the same time we also understand that this speed is adjustable, if the future upload demand increases, then the operator is likely to adjust on demand, so that our upload speed up, theoretically faster than download speed is entirely possible.