There is no signal on the way to the high speed train, so why is the cell phone signal speed so bad in Shenzhen North and Guangzhou South?
Everyone in the train, high-speed rail, moving car, have you found such a situation: cell phone signal is much worse, call intermittent, and sometimes even no signal, this is how it is?
At present, poor cell phone signal on trains and high-speed railways is a common phenomenon. The main reason for this phenomenon is: the high speed train traveling too fast. On a high-speed train, you will quickly pass through areas with different signal coverage, which requires your cell phone to quickly switch between different signals. If you don't have enough time to complete the signal switching, your phone won't be able to connect to the next signal as soon as you lose the original one, and the signal interruption will occur.
Coupled with the fact that high-speed trains use a fully enclosed car structure and some cars use metal-coated glass, resulting in greater car penetration loss in wireless transmission, the signal attenuation is much greater than in ordinary trains.
At present, there is no significant way to solve this problem. It is recommended that users who need to open the SMS call, leakage reminder and other functions, high-speed rail on the cell phone signal quite a lot, in case of missed calls will be trouble. All three major carriers provide such services, and some virtual carriers can also provide such services.
So which operator has the best 4G network on the high speed train?
The test results, "China's good 4G" also released a related video on Weibo, showing the test results during the period.
When the forward speed of the high-speed rail reaches 300Km/h:
Unicom's average download speed is 12M/s
Telecom's average download speed is 5M/s
Mobile's average download speed is 6M/s
During the whole test, Unicom's 4G's download speed on the high-speed rail is much more stable, with an average speed of 12M/s. Combining the whole test results, Unicom 4G's download speed is much more stable, with an average speed of 12M/s. /The final conclusion of the blogger "China Good 4G" is that Unicom 4G signal is good on the high speed train, after summarizing the results of the whole test!
Why is Unicom 4G the fastest on high-speed rail? After checking the relevant information, quoting the experts' opinion is:
First of all, the construction of high-speed rail 4G network is unified by Unicom Group directly.
Unlike other operators is the provinces around the head to build, to know if the provinces around the head to build coverage, around the world have around the small, many cities will think that the high-speed rail is a passer-by, and their own local users are not very relevant to naturally reduce the investment, the network coverage is naturally less than the unified build the perfect. Unicom, on the other hand, ensures that the network quality is at a high level in the industry through centralized evaluation, centralized optimization, centralized management and centralized monitoring.
Moreover, the fast Unicom is born with network speed.
Simply put, Unicom and Telecom are using the FDD, that is, the frequency of the network speed, mobile TDD, that is, to time, the same bandwidth FDD can be realized double, and TDD can only be used to one-half of the bandwidth, so the same is the use of 20 megabytes of bandwidth, the Unicom's can be 40 megabytes of network speed, mobile can only be realized 10 megabytes, this is the difference. There are children's shoes will ask, why telecom's measured and mobile almost, because telecom with only 15 megabytes, 20 megabytes than the Unicom is less, double the speed is 10 megabytes of difference.
Summary: Unicom 4G on high-speed rail, better signal, faster speed.