Beijing time, October 26, according to foreign media reports, a research team composed of researchers from MIT, Harvard and other European universities has recently devised a method that can increase the transmission power without increasing the base station , And increase the speed of the wireless network by 10 times without additional bandwidth. It is expected that the advent of this technology will have an important impact on the development of LTE and WiFi. Essentially, this technology called "encoded TCP" will completely eliminate packet loss during data transmission. In the wired network, the packet loss rate is very low, but for wireless networks, this is a big headache. According to the data, the packet loss rate of the MIT campus wireless network is about 2%, and on a fast-moving train, the packet loss rate will rise to about 5%. Once data packet loss occurs, it will be very headache, because the recipient has to inform the sender of the data that his data packet has been lost, and then desperately waits for the sender to retransmit. If a large area of ​​packet loss occurs, a large number of repeated transmissions will be required, which will seriously squeeze the bandwidth and cause a serious reduction in network speed. This is why the speed of the wireless network is affected in some environments, such as on a fast train, or after a thick wall. The technology developed by the researchers this time is trying to avoid a large amount of data rediscovery caused by the high packet loss rate. Although the current specific approach is still confidential and has been applied for technology patents by some companies, we can still give some basic descriptions. In a standard TCP connection, the network adapter will steadily realize the transmission of data packets. Each such data packet has a header, which stores the target IP address and other important information. When a data packet passes through the router, it checks these headers and transmits them to the corresponding destination IP address. At the target address, these data packets are reorganized to form the original original file. If a data packet is lost in the middle, the terminal must wait for this part to be retransmitted to reorganize the file. After using encoded TCP technology, a large number of data packets will be packed together and processed using an algorithm equation, which will describe these packets. If part of the information is lost, the receiving end can extract the lost information by interpreting this description equation. The interpretation of these equations is simple and linear, which means that this process does not take up too much internal computer resources. In the test, this technology greatly improved the performance of data transmission. MIT found that the transmission speed of its campus wireless network has greatly increased from the original 1Mbps to 16Mbps. On a fast-moving train, the network access speed also jumped from 0.5Mbps to 13.5Mbps. Of course, this technical improvement is not so unexpected. TCP technology is designed for a wired network with a low packet loss rate. In this system, packet loss is generally a signal of network congestion. Wireless networks currently need forward error correction technology (forward error correcTIon), and this is exactly what coding TCP provides. It should also be noted that this technology does not have much effect in an environment with low packet loss rate. For example, in a network system that already has a very low packet loss rate, its speed will not suddenly jump from 300Mbps to 3000Mbps due to the use of this technology. In the wireless network environment, low packet loss rate is very rare, and in the cellular network system, it is also costly to add new base stations. Under these circumstances, the coding TCP technology will show its huge improvement effect. Another point worth mentioning is that researchers are currently not planning to deploy this technology on a large scale. However, some hardware manufacturers are currently actively acquiring related patents, and it is expected that commercial products will be launched in the near future.
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This chart shows the impact of high packet loss rates on network performance