In the previous article “National Attitudes to Driverlessnessâ€, the new wisdom drive referred to various supportive policies adopted by unmanned authorities in various levels of government agencies, etc. At that time, it was concluded that the Asia-Pacific region is indeed more conservative than Europe and the United States. Some, but this is also because of different national conditions. In the article, China does not have much clear supportive policy in terms of driverlessness. It only supports attitudes. However, according to recent news in the industry, China’s technical standards for unmanned driving will be introduced in August. Now.
Google Unmanned Vehicle
Recently, at the "2016 Automobile and Information and Communication Integration Development Forum," Director of the Automotive Division of the Ministry of Industry and Information Technology of the Ministry of Industry and Information Technology, Miao Weizhen mentioned in his speech that the research on the "Intelligent Network Alliance Automotive Development Technology Roadmap" has been basically completed. Launched in August, the so-called "Intelligent Connected Vehicle" includes the "driving without driver" and "autopilot" that we have always mentioned.
The Ministry of Industry and Information Technology also commissioned the Automobile Association to take the lead in drafting the overall plan for the development of the intelligent networked automobile development. Some policy measures are also being pushed forward.
It is understood that the state’s overall plan for “Intelligent Connected Cars†began in October 2014. At that time, the Ministry of Industry and Information Technology entrusted the China Automobile Industry Association, the China Automobile Engineering Association, and the National Automobile Standardization Technical Committee to carry out research. Among them, the China Automotive Engineering Association is responsible for the development of the technology roadmap, while the steam standard committee is responsible for the planning of the standard system. At present, the intelligent network-linked automobile standard system plan has been drafted. After many rounds of discussions in the industry, a standard framework system has been formed, and opinions have been formed. After revision and improvement, it will be publicly released. At the same time, it is also applying for the establishment of the Smart Net Alliance Automotive Subcommittee, which plans to bring in experts from related fields and jointly research and formulate relevant technical standards. The development of specific standards such as intelligent assisted technology information security is also accelerating.
It is understood that this set of standard system framework to be released next month includes four main parts: basic, general specifications, product and technology applications, and related standards. The basic and common specifications relate to the basic standards for the commonness of network integration. The application of products and technologies involves specific design standards and is the backbone of the framework. It includes details on information collection, decision alarm, and vehicle control. The related standards relate to information exchange, communication protocols, connection interfaces, and so on.
Baidu unmanned vehicles
In other words, the standard for smart gridlink cars will soon be introduced in China, which will also affect the future development of China's smart gridlink car. However, industry insiders said that this is not a complete "Intelligent Network Alliance automotive standards", but an overall framework, specific details will be added and adjusted in the future.
In May of this year, the State Council issued the “Made in China 2025â€, which has already made the Intelligent Internet Alliance automobile industry one of its key areas. The “Thirteenth Five-Year Plan†outline also explicitly implements “Made in China 2025â€.
In the past two years, the Ministry of Industry and Information Technology has also done some work in promoting the integration of the automotive industry and information and communication technologies, including strengthening the top-level design of intelligent networked vehicles, clarifying the overall development goals, major tasks and safeguard measures, and organizing the domestic Tsinghua University Automobile Association. Research institutes such as the Research Institute and the CCID Research Institute have developed the Smart Net Alliance automobile development strategy as the basis for other planning and work programs.
In other words, the intelligence and networking of automobiles have already entered the strategic planning of the country's future development.
However, many people in the industry stated that they have some concerns about the development of intelligent network-linked vehicle standards and believe that intelligent network-linked vehicles are new and technological development is not mature enough. Forming standards too early will instead limit the progress of technology. But this point Lei Feng network (search "Lei Feng Net" public concern) do not have to worry about too much, because standards are generally used to ensure safety, applicability and other just-standard, and the technical constraints will not be too large, and It will adjust accordingly with the improvement of technology. In general, the introduction of technical specifications also means that China’s “Intelligent Connected Vehicles†is on the right track.
First, Wireless Router
So what is a wireless router?
Wireless router, according to the definition of Baidu Encyclopedia: Wireless router is used for users to access the Internet, with wireless coverage of the router.
A wireless router can be thought of as a repeater that forwards the broadband network signal from the wall of your home through an antenna to nearby wireless network devices (laptops, Wifi-enabled phones, tablets, and all Wifi-enabled devices).
The popular wireless routers in the market generally support four access methods: dedicated xdsl/cable, dynamic xdsl, pptp, and generally can only support 15 to 20 devices online at the same time. It also has some other network management functions, such as dhcp service, nat firewall, mac address filtering, dynamic domain name and so on. The signal range of the general wireless router is 50 meters radius, and the signal range of some wireless routers has reached 300 meters radius.
The name of wireless router can be separated out of two keywords: wireless and routing.
Understand the technical principle behind these two words, you understand the wireless router.
Wireless is also what we often call Wi-Fi. Wireless routers can convert home broadband from wired to wireless signals, and all devices can happily surf the Internet as long as they connect to their own Wi-Fi. In addition, these devices also form a wireless local area network, where local data is exchanged at high speed and is not limited by the bandwidth of home broadband.
For example, many people have smart speakers in their homes that can be used to control various smart appliances. When you say small X small X, turn on the TV, the speaker actually finds the TV through the LAN and sends instructions, and does not need to connect to the Internet; And if you let it broadcast news, you have to get data through the Internet.
The Local Area Network we talked about earlier, also known as the Intranet, is represented by the Local Area Network (LAN) on the router, so the Wi-Fi signal is also called WLAN(Wireless LAN); The Internet we want to access, also known as the extranet, is represented on the router by the WAN(Wide Area Network).
On the Intranet, the IP address of each device is different, which is called a private address. All devices on the Internet share the same public address, which is assigned by broadband operators such as China Telecom Unicom.
The router is the bridge between the Intranet and the external network. The above mentioned IP address translation, packet forwarding, is the router routing function. In other words, the router is the hub of the home network, and the data of all the devices must be forwarded through it to access each other or reach the external network, which means that one husband is the key and ten thousand men are not open, so the comprehensive router is also called "home gateway".
Second, the demand for wireless routers
I do not know if there is a sudden WIFI break when you play games at home, and a stable router is crucial at this time. However, it is important to note that your WIFI frequently dropped may not be a problem with the router, it may also be a problem with the carrier network. (Router means I don't back this pot)
In fact, for most people, there are two basic requirements for wireless routers
Stable and do not drop
Fast Internet and easy setup
Some people will have some advanced needs:
There are some features, USB interface, can be external U disk or hard disk, can achieve simple nas functions, QOS, etc., to advertising and so on
Mesh networking, when the house area is large, multiple routers can be used for Mesh networking
How to choose a wireless router
The wireless router market is in the transition stage from WiFi 5 to WiFi 6, if you want to buy the first choice is definitely WiFi 6 wireless router, which is the future trend.
The speed of WiFi 6 is nearly 40% higher than the previous generation 802.11ac, and the highest connection speed can even reach 9.6Gbps, while the highest speed of 802.11ac is only 6.93Gbp. More importantly, unlike 802.11ac, which only covers the 5GHz band, WiFi 6 covers 2.4GHz and 5GHz. Although the 5GHz band has less interference, it has weak wall penetration ability, and the 2.4GHz band has strong wall penetration ability, which takes into account each other.
So why choose a WIFI6 router?
Compared with the previous generation of 802.11ac WiFi 5, the maximum transmission rate of WiFi 6 in the 5Ghz band has been increased from 3.5Gbps to 9.6Gbps, and the theoretical speed has been increased by nearly 3 times. WiFi 6's 5Ghz single-stream 80Mhz bandwidth can reach theoretical speeds of up to 1201Mbps and 160Mhz bandwidth of up to 2402Mbps.
The band supports 2.4Ghz and 5Ghz.
In terms of modulation mode, WiFi6 supports 1024-QAM, which is higher than the 256-QAM of WiFi 5, and the data capacity is higher. Some high-end WiFi 6 routers support 4096-QAM.
WiFi6 supports MU-MIMO (multi-user multiple-input multiple-output) technology, and supports both upstream and downstream MU-MIMO, with a maximum support of 8T×8R MU-MIMO. The speed is greatly improved. High concurrency, WiFi6 5GHz band, terminal connections up to 128! 5 times that of WiFi5. Effectively solve the Internet needs of multi-person networking and smart home;
WiFi6 adopts OFDMA (orthogonal frequency division multiple access) technology. After using OFDM to parent the channel, the transmission technology of transmitting data is loaded on the subcarrier, allowing different users to share the same channel, allowing more devices to access, with shorter response time and lower delay.
Low latency, WiFi6 time delay can be as low as 10ms, compared to WiFi5 30ms delay, only 1/3. This performance refresh is extremely friendly to game lovers;
If WiFi6 (wireless router) devices need to be certified by the WiFi Alliance, they must use the WPA 3 security protocol, which is more secure.
The WiFi6 wireless router is backward compatible with WiFi5 and WiFi4 terminals.
Fourth, the misunderstanding of purchasing routers
Is the through-wall router really through-wall?
Mistake; The country has strict limits on the transmission power of the wireless router antenna, if you have a lot of rooms in your home, and there are many walls between them, even if you buy an expensive wireless router, you can not do one to cover all the room signals. If the signal is not good, you can consider multiple wireless router Mesh networking.
Does a wireless router have a stronger signal with more antennas?
More antennas just to match the X*X MIMO mode, the more antennas, the more channels, can only ensure that the network is more stable, the impact on the signal is little, the strength of the signal is only related to the wireless transmission power. The wireless transmission power of the country has a standard.
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