Waiting for ten years | What can fly on the Internet technology?

In the past when we were flying, the stewardess told us that the mobile phone needs to be shut down. This rule has changed recently. According to the Civil Aviation Administration of China (CAAC) statement on portable electronic equipment (PED) on aircraft, from January 18, 2018 onwards, Chinese users no longer have to shut down when they fly their aircraft. The era of aircraft mobile communication is finally coming, but can you know the technology from this? And listen to me slowly.

Why some aircraft before the Internet?

A: The aircraft benefited from the satellite mode and ground base station mode (ATG) two modes

First of all, understand why you can not use the mobile phone by airplanes, because the signal sent by electronic devices such as mobile phones may interfere with the normal signal transmission and make the aircraft in the wrong operation status, seriously affecting flight safety. Base stations transmit signals to aircraft that may be affected by signals transmitted by the handsets.

Affect the ground station signal? So simply my cell phone does not transmit signals through the ground station, with the other will not interfere with, therefore, one of the two modes of aircraft Internet -Satellite mode , It was developed.Mobile phones do not go through the ground station and communicate directly with the satellites to access the Internet.You may want to ask whether the signals from the satellites will affect the aircraft? The answer is no, at present, the aircraft uses the Internet Is in the Ku band in the 12.24-18GHz frequency range, whereas the current cellular phone systems and aircraft operate at frequencies between 800 and 1800MHz and hence are not affected by the band used by satellite mode.

Many satellite mode homes are doing, such as Iridium satellite, maritime satellite, and some commercial Ku band satellite (Matsushita scheme is more mature).

Normally, the top of the aircraft in satellite mode will have a rather bulging 'bulge', which is the cat used to receive satellite signals.

The advantage of satellite mode is that the coverage area is wider, but there are also some problems that the signal speed will be greatly influenced by the antenna attitude when the camera body is jittering or maneuvering, so the network speed will be unstable , Commonly known as'Change the card' .

Airplanes that use satellite mode to connect to the Internet usually use the Internet connection in the form of specific 'Wi-Fi', and in spite of the different frequency bands, just in case, the aircraft still needs to be used when it is over 3000m in flight or on the ground.

Having said the first of the two major modes of aircraft internet access, and looking at the second one, that is Ground Base Station Mode (ATG) .

Terrestrial Base Station Mode (ATG) is called Air to Ground, a kind of low-altitude signal transmission. It needs to set up ground base stations along the flight path or a specific airspace for coverage at high altitude, that is, using these ground base stations and aircraft for direct information transmission.

Is not it sounds messy, do not understand? Popular point is concerned, is to build a plane belongs to the aircraft's own base station, designed to fly passengers to use the Internet, which resulted in some limitations - the deployment of the ground station These base stations are not suitable for cross-ocean (international routes) use and are more suitable for countries with larger terrestrial land areas. Currently, 1,500 flights from 9 U.S. airlines have utilized this method of communication To achieve a comprehensive air Internet experience.Abundant and signal coverage is not broad enough, after all, the impact of the ground station signal area is limited, not as good as a wide range of satellite mode radiation.

Why have these two models have long been, the plane has not yet universal access to the Internet?

A: To put it plainly, the aircraft online money, the use of expensive, cost is high, not only that, before because of immature technology, but also card, card and expensive, Which airline dare to use?

The same is true. The ATG needs a ground station to transmit air to the ground. The aircraft uses an antenna installed on the belly to accept it. Generally, an omnidirectional antenna (featuring a small antenna without servo) is required. In addition, Airborne equipment, a dedicated set of servers, Wi-Fi hotspot equipment, etc., although the total cost of cheaper than satellite programs, but it also needs about 300,000 US dollars.

Speed ​​is also very touching, Ku band can achieve downlink 5Mbps, uplink 1Mbps speed, the actual use of the above also said that the body jitter or do some maneuver will change the card, before the actual experience is not optimistic.

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Why can not mobile phones require the Internet?

If the satellite mode and the ground station mode are two major aircraft access modes that are improved for the signal source, the flight mode is an improved mode for the mobile phone, but the airplane is not allowed to use the flight mode for many years. In the past, the so-called flight mode, Only handset manufacturers justify themselves, and did not get aviation safety testing and acceptance.So until now, the phone's flight mode is not approved by the aviation sector and airlines.

It is important to understand that, from a safety point of view, an extremely transport-critical vehicle, such as an airplane, must try its best to exclude unsafe factors, rather than ignoring unsafe places as much as possible. The certified flight mode, of course, is forbidden, which is why there are cell phones in flight mode or why they are banned from using the cell phone on an airplane.

The Historical Development of China Mobile Internet Access Mode

At the beginning of this year, the only operator in our country that had a photo camera for satellite mobile communications was China Telecom, which started using Ku satellite communications technology globally to provide passengers with access to the aircraft from 2014. As of now, the aircraft of China Airlines The total has exceeded 112.

In the field of airborne communications, China Mobile also has many years of deep plowing experience.China Mobile itself has a 4G network of research and technology, to take advantage of this, then also launched a 'ATG (ground-air communications) + satellite communications' hybrid network Way to provide travelers with an optimized solution for airborne communications through complementary advantages.United Kingdom Airlines carried out the flight experience many years ago and achieved good results.

As mentioned in the last paragraph, "expensive and expensive", so the aircraft did not get widespread Internet access.

And China Unicom solved the fundamental problem, through its own solution, the Ku-band satellite network mode greatly increase the program speed, from the original downlink 5Mbps, uplink 1Mbps rate increased to downlink 130Mbps, uplink 30Mbps. Nearly 30 times Upgrade, finally no card.

A report from the Weibo mainstream media is very compelling 'With the successful launch of China's first Ka-band communications satellite' Star 16 ', China Unicom, in conjunction with China Satcom and related avionics providers, began to deploy the aviation internet The whole industry chain is eco-friendly and jointly promote the commercial launch of 'No.16 Star'. Unicom has also become the first telecom operator among the three operators that owns both the Ku-band and Ka-band satellites.

It also made us understand that Unicom's unique solution benefited largely from this newly launched satellite, 'Star 16'.

Look at a news' in April 2017 to set up joint venture Unicom Air China is China Unicom satellite network communication service construction system of the undertaker and the executing unit, from January 16, 2018 to February 2, They held the China Unicom's aviation internet experience at Beijing Unicom Satellite Office and focused on demonstrating the comprehensive Internet / Internet technology solution based on the Ku / Ka band.Guo Man, General Manager of Unicom Airways, said that the launch of the 'Fast Bandwidth' internet business in the air was a combination of Unicom One of the results of the change.

In other words, China Unicom Airlines in order to achieve the popularity of the aircraft set up a 'Fast Bandwidth' plan, the basic plan is to launch 'Star 16' satellite, and the mainstream Ku band is different from the plan Also joining the 'Ka' band, it is understood that this band is mainly used to achieve a reduction in system and flow costs as well as an increase in user experience, and it will take some time to install this system specifically for the 'Ka' band Popularization, 'It is estimated that can hold 5 aircraft this year, can hold 50 or more next year.' Unicom Airlines official said.

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What are the advantages of Star 16?

First of all, this satellite has 20G bandwidth and mainly covers the eastern and eastern coastal areas of our country. The new satellite with 18G bandwidth to be launched next year will cover the western part of China while China Unicom will cover its own satellite communications service to a larger extent On January 9, 2018, while France's President Macron's visit to China, China United Network Communications Co., Ltd. and Eutelsat signed a memorandum of understanding on cooperation in the Great Hall of the People to jointly explore the satellite for the "Belt and Road" region Communication business reached a strategic consensus.

According to the agreement, EUTELSAT 172B satellite will be used initially to enhance China Unicom's satellite communication service capability from the west coast of North America to Asia and Oceania. With the E10A, airborne airborne communication services can be extended to continental Europe and more deployments will be considered in the future Of the resources for the provision of satellite communications services worldwide, to this end, China Unicom also bought 40% of European resources company's full life cycle of 15 years.

What is the cost of the plane online?

It is worth mentioning that even though Chinese users may use their cell phones to access the Internet while on an airplane from 0:00 on January 18, 2018, they still may not be able to make calls. Although the aircraft can make satellite calls, it may be cheaper , There is no way to be universal.Industry experts pointed out that in order to solve the issue of low-cost aircraft on the technical level, but also need to increase the communication bandwidth and transmission rate onboard more than 10-100 times.

To satellite mode, ATG base station or the future 5G communication network integration, but also for the characteristics of voice services, special on-board voice transmission technology optimization and the corresponding mobile phone chip algorithm upgrade.In general, to achieve in Plane call, there is still some way to go in the future.

Said so much nonsense, answer the key points: What is the cost of the aircraft online?

For passengers concerned about whether the Internet access charges, I conducted a review found that China Eastern Airlines, China Southern Airlines, Air China, Hainan Airlines Air Wi-Fi is currently no charge.Li Zhi Jie, senior civil aviation officials said the current cost of aircraft access to the Internet is relatively high, Attracting visitors to purchase tickets, there is no problem of charging passengers, or a nominal fee.

But if the airline rates it as a profitable project, it will take the direct charge of passengers or advertisers and other channels to collect fees way. 'He described, for now, the follow-up may be part of the domestic aviation enterprises to take direct Charges to travelers for traffic costs.

In my opinion, after the popularity of Wi-Fi in the air will not be overcharged in the future, first of all passengers who fly frequently are accustomed to 'flying a plane and not playing a mobile phone', plus the aircraft is currently one of the fastest speed means of transport, traveling shorter Of the plane, even if most of the passengers can also access the Internet can bear, so if you want to keep costs high to make a profit, it is likely to be 'depraved.' Of course, we will not rule out the 'takeaway' Shared bike 'isothermal boiled frog's profit model, which is the beginning of a lot of concessions, the price slowly on the mention.

Write last

On the whole, the successful launch of the "No.16" star indicates that the beginning of the global plane access to the Internet has also created benefits for the passengers in China, East Asia and South Asia with signal coverage, and I do not seem to have Feel excited, as I can do the train is not a plane-saving users, or hope that the plane fares can be lowered, after all, for now, the plane can be considered a more extravagant activities.

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