Youmight have noticed that sometimes, when you are playing mobile games, thepicture suddenly freezes (卡顿) because the network speed is oslow. However, these annoying things will soon become a thing of the past, asChina just issued commercial licenses (发放商用牌照) or 5Gnetworks on June 6, 2019. This means that China's telecommunications companieswill be able to offer 5G network speeds to users.
The"G" in "5G"stands for generation. IG let us talk to eachother, 2G let us send messages, 3G gave us mobile data and internet, and 4Gmade all of these things faster. So what will SG bring?
Itwill allow us to download an entire HD movie in seconds. The delay (延时) between sending and receiving data will be shortened. Now, 4Gtakesabout 100 to 200 milliseconds, while humans have a reaction time of about 200 to300 milliseconds. But 5G will get the delay down to I millisecond or less, whichis almost real-time.
Withthe development of 5G, new kinds of technology will be created and used.
Robotswill be used to do operations because doctors will be able to control them fromsomewhere else without any delay. Self-driving cars will be able to drive more safelybecause they can smoothly communicate with each other, traffic lights and roadsensors.
5Gnetworks will be powerful, but not perfect. They do have some disadvantages.
Onone hand, 5G signals don't go very far. On 4G networks, you can be 10kilometers away from the nearest transmission base (传送基站) and don't lose signal. But 5G maxes out at about 300 meters. Onthe other hand, 5G signals have a hard time going through walls and rains. Thismeans we will need to build many small transmitters to make sure 5G signals canbe received everywhere. Soon you may see small boxes on every street lamp andbuilding
