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题型:阅读理解-阅读表达 难度:0.65 引用次数:78 题号:14336798
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Difference between 4G And 5G

5G is the newest mobile network that's replacing the current 4G technology by providing a number of improvements in speed, coverage, and reliability.

The reason for needing an upgraded network is to support the growing number of devices that demand internet access.Many of them require so much bandwidth in order to function normally that 4G simply doesn't cut it anymore.

5G connects many more devices to the internet, minimizes delays, and delivers extremely fast speeds.4G uses frequencies below 6 GHz while some 5G networks use higher frequencies (频率) like around 30 GHz or more. These high frequencies support a huge capacity for fast data and can be used in the future for increasing bandwidth demands. They can also be used right next to other wireless signals without causing interference.

5G uses shorter wavelengths than 4G, which means that antennas (天线) can be much smaller while still providing precise directional control.Since one base station can use even more directional antennas,it means that 5G can support much more devices per meter than what's supported by 4G.

However,some of these high frequencies are easily absorbed by humidity,rain,and other objects, meaning that they don’t travel as far.It is for these reasons that a strong 5G connection right where you are could slow down to 4G speeds when you walk a few feet away.One way this is being dealt with is by using strategically placed antennas, either tiny ones in specific rooms or buildings, or large ones positioned throughout a city. As 5G expands, there will also probably be many repeating stations to push the radio as far as possible to provide long-range 5G support.

5G is 20 times faster than 4G. You could download close to 10 movies before 4G could deliver even the first half of one.

5G will help to build future “smart cities” with the help of sensor networks. Such networks will be able to help the police with the traffic, let us know what's happening in our homes, and even make it possible for doctors to perform an operation far away.

1. Why do we need upgraded network?
2. Please paraphrase the underlined part in the second paragraph in your own words.
3. Please decide which part is false in the following statement, then underline it and explain why.
These high frequencies of 5G support a huge capacity for fast data and can travel very far.
4. How will 5G help us? (About 40 words)
21-22高三上·北京房山·期中 查看更多[2]
【知识点】 信息技术

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