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　　6月末的時候，中國移動公布了5G網絡的推出時間表，我們的手機網速終于要再一次飛天啦。根據這個時間表，他們今年會在5個城市啟動5G的外場測試，2018年開始規模試驗，而到2020年就能全面開始商用了。

　　話說，從3G和4G開始，我們對這種起名方法就已經不陌生了。不過，大家都知道這個G到底是什么意思嗎?3G、4G、5G又分別是什么呢?今天就讓小編來科普一下這個吧~

　　首先，這個 G 代表的是 Generation(一代)5G 的全稱是 5th generation mobile networks，也就是“第五代移動網絡”。然后，5G 和 4G 相比，除了速度更快以外，它還能容納更大的用戶密度(user density)換句話說，扎堆上網拖網速的現象會減輕很多。而且它支持一種叫“設備到設備通訊”的技術：Device-to-Device Communication(D2D)3G、4G網絡里，所有的設備之間，如果要傳遞信號，這些信號都需要經過中轉站。而 5G 里面則可以通過這種 D2D 技術直接傳，這也是它的速度得以進一步提升的原因之一。

　　參考范文：

　　5G的詳細介紹及前景展望

　　目錄

　　1 2

　　The development of mobile communication technology What is 5G? Why do we need 5G?

　　34

　　Research status and challenges of 5G.

　　1

　　The development of mobile communication technology

　　The development of mobile communication technology

　　Digital mobile communication system Broadband access and distribution network system

　　1G

　　Simulation of mobile communication system

　　3G

　　multimedia mobile communications system

　　2

　　What is 5G?

　　01 An English abbreviation

　　5G is the English abbreviation of “The fifth generation mobile communication technology”

　　An English abbreviation

　　converged

　　02 UNE

　　Compared with 2G, 3G and 4G, 5G is not independent and brand-new. It is a combination and further development of present mobile communication technology.

　　03 A green energy network

　　network

　　Besides the speed upgrade, 5G will also meet the requirements of large bandwidth, super high capacity, super dense site, super high reliability and whenever and wherever possible access.

　　A green energy network

　　Some details about 5G

　　3

　　Why do we need 5G?

　　Mobile communication has profoundly changed people's life, but people's pursuit for higher performance of mobile communication has never stopped.

　　In order to cope with the future of mobile data traffic explosive growth, the connection of massive device, the continuous emergence of various new services and applications scene, the fifth generation mobile communication (5G) system will emerge as times require.

　　The necessity of 5G

　　Why does the vision of 5G emerge?

　　5G will make information break through the limitation of time and space, providing excellent interactive experience and immersive information feast for the user. Through the seamless fusion way, 5G will close the distance of all things, realize the intelligent interconnection between man and all things on earth.

　　5G will provide the access rate of fiber like, the using experience of “zero delay”, the ability to connect billions of devices, super high flux density, super high connection number density , super high mobility and other multi scene favorable service and intelligent optimization of business and user perception. At the same time, 5G will bring the network over a hundred times the energy efficiency and ultra hundred times the bit cost reduction. Finally 5G will realize the general hope of “Get the information whenever you want and all things on earth are at your fingertips”.

　　4

　　Research status and challenges of 5G.

　　To meet the demand of 5G, breakthrough in air interface technology is necessary. But innovation in network architecture is also significant and necessary so as to realize the vision of 5G.

　　Centralized or distributed network architecture The dividing line of access network and the core network

　　To realize network construction or function configuration

　　Part1 Five opening problem on designing 5G network architecture

　　The influence of NFV and SDN

　　IMT-2020 (5G) architecture is evolution or revolution

　　Part 02 Integration of 5G and Wi-Fi

　　An general introduction of Integration of 5G and Wi-Fi

　　The integration network of 5G and Wi-Fi can well solve the problem of rapid growing wireless traffic and user experience pursuit in 5G. Integration of multi-radio access technology, multiple needs and multiple internet were studied to become the inevitable trend for IMT 2020 (5G).

　　In the networking of 5G and Wi-Fi, integration of network application scene and fusion networking technology were introduced to be the inevitable demand, nosense authentication, network security, green communication were proposed to become the key technical indications.

　　Integration of

　　networking

　　technology route

　　Integrate Wi-Fi into mobile communication network as a wireless technology under the circumstance of integration of a variety of cellular network. To realize the multiple access mode of core network with other cellular technology

　　no-sense authentication, network security, green communication were proposed to become the key technical indications.

　　key technical indications

　　Some challenges

　　To work well in a multi service environment with seamless handover technology ? Interference suppression technology ? Automatic adaptation technology ? Security problems. Seamless docking of secure protocol when integrating 5G and Wi-Fi.

　　Part 03 Security vision of 5G

　　The security key technologies

　　1 2 3

　　Large data security in 5G

　　Security problems brought by cloudization, virtualization and Software Defined Network, SDN

　　The security of mobile intelligent terminal

　　Researchers

　　THANK YOU VERY MUCH

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