"There is no signal on the high-speed rail", "There is no Internet access on the plane", "The signal in the subway is not good", these have almost become the common sense recognized by most people. The demand for communication anywhere, anytime, users can be stuck in the traffic, good With the wide application of 4G LTE technology, these phenomena are about to become a backward history. With its high speed, large bandwidth, high spectral efficiency, low latency and many other technical advantages, LTE has found a broader world outside the traditional carrier market. The big transportation industry is one of them.
High-speed rail signal difference will become history
The signal on the high-speed rail is very poor. Many passengers have a deep understanding. From a technical point of view, the mobile phone call on the high-speed train is intermittent and the signal is unstable. On the one hand, the density of the distribution point along the base station is insufficient, and on the other hand, the train The running speed is too fast, exceeding the speed at which the mobile signal is switched between the base stations, thus affecting the signal quality of the mobile phone on the train.
The construction of wireless networks for high-speed mobile scenes has long been a difficult point in the development of mobile communication technologies. Since the operation of high-speed rail, the three major operators in China have been solving signal quality problems. The arrival of LTE has made a qualitative leap in this effort.
In December 2012, Zhejiang Mobile and ZTE Corporation completed the 4G TD-LTE network coverage of the Jiaxing section of the Shanghai-Hangzhou high-speed railway, and realized the download of data services under the 300-kilometer high-speed rail scene. After the actual high-speed rail test, the average data service rate can reach 17.7MBPs- 21Mbps, and the peak download rate is 54.9Mbps. It can meet the needs of passengers working on high-speed rail, watching videos and browsing the web. This line has become the world's first coverage. High-speed rail line for 4G networks.
Recently, Zhejiang, Jiangsu and Shandong have announced that they will achieve full coverage of the province's high-speed rail line before the end of the year. It is believed that other provinces will follow suit. In the future, “high-speed rail travel + high-speed Internet access†will become standard.
The age of the Internet is coming soon
It is impossible to communicate with the Internet during the flight and lose ground with the ground. This phenomenon will also become a history with the adoption of LTE technology. In the past few years, domestic airlines have made many attempts to provide air-to-air services, including deploying servers and related equipment on flights, building on-board local area networks, and using satellite communication equipment to achieve on-board Internet access. In-flight communication has been in foreign countries for 10 years, and there are four or five years of Internet access. ZTE’s vice president, Gong Yuezhong, said that as early as 2007, ZTE and the US Aircell cooperated to build a GoGo network platform, which has been used by nine US airlines. Over 1,500 flights provide air access.
In April of this year, Air China and ZTE launched the first 4G air-to-air service in China, using 4G system ground-to-air coverage. When flying at a high-speed flight of 10,000 meters, passengers can browse through terminals such as notebooks and PADs at any time. Web pages, watching videos, sending and receiving emails, etc.
The aircraft flies at a high speed of 10,000 meters and generally has a speed of more than 1000 km per hour. It is necessary to solve the problem of coverage and access of LTE under such specific conditions. For example, Doppler frequency offset caused by high-speed flight of aircraft, high-speed switching of ground station information, and so on.
After Air China, China Eastern Airlines and China Southern Airlines have announced that they have the ability to access the Internet. The era of civil aviation entering the air Internet seems to be just around the corner.
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