A lot of people will say that 5G is not equal to 4G+1G. However, when displaying 5G, it is often just to show the peak rate, and habitually return to the logic of 4G+1G. In fact, the real trump card of 5G may not be a high rate. If 5G is really a new energy source, “fast” is not the key to entering all walks of life. “Low delay” is the key.
The gap of 19ms
Where is the difference between 5G and 4G? The change that many people may blurt out is the improvement of the speed of the Internet. Even in many news reports, it is also the display of 5G technology somewhere in a certain month of the year. It takes only X seconds to download a high-definition movie on the spot. However, the most qualitative change in 5G and 4G is not a high rate, but a low latency. In this regard, Ericsson and the Paris Saint-Germain football club have done such a test.
The test is performed using 4G VR devices and 5G VR devices respectively, and athletes are wearing VR devices.The first angle of view displayed by the VR device is used instead of both eyes for motion.
The delay in the 4G network is 20ms, when a group of players During the shooting practice, although the goalkeeper can normally see the video, it is impossible to save the flying football.
and the delay in the 5G network is 1ms, when performing the same shooting practice The goalkeeper not only can see the video screen, but also can see the picture in near real time, so that he can receive the ball calmly. The goalkeeper even said that wearing the 5G VR gate is very "Easy".
In addition, Ericsson also let the "Greater Paris" players try to play the ball with 4G VR equipment and 5G VR equipment respectively. The 5G VR screen with a delay of only 1ms can make the players complete the game. Ball. But under the 4G network, this 19ms gap makes even the high-level athletes unable to complete the most basic ball-turning action, and even can not complete the return of the ball.
Low delays inspire new game opportunities
It’s not difficult to get from this comparison.Low latency is the real trump card of 5G, or 5G upgrades the low latency of the original 4G network to almost no delay. In fact, taking many online games as an example, the more real-time confrontation features, the more developers need to optimize the delay. For example, Nintendo optimizes the online game of the host game "ARMS" to solve The delay of the two boxers during the fight. For many mobile games, a time delay like football is about the timing of the game. In the current 4G network environment, there is not even a networked competitive product that can satisfy the players.
At the same time, cloud games have also emerged, and a large number of companies such as Google, AT&T, Verizon, NVIDIA, and Tencent have different levels of layout. In effect, whether it is on a notebook, tablet or mobile phone, it can achieve the same game running effect as a local game console. The role of low latency is also indispensable.
On the other hand, for the device VR device used in the above test,Undoubtedly will bring new opportunities to VR games, VR will further move between virtual and reality, ultra-low latency will make VR games more competitive during the battle, and even join the real body Contact and confrontation bring more design space to developers.
Low latency is about life safety
A low latency One important point is that the 19ms gap that is slower to join 4G than 5G is only related to the player's outcome in the game. Then, in the automatic driving, smart factory, and robotic arm remote surgery, it is directly related to life safety. As in the case above, if the goalkeeper who can receive the ball under normal circumstances is compared to a car, it will most likely be delayed due to the 19ms delay while avoiding the target, thus causing a traffic accident. By the same token, in the operation of the factory that requires refinement, it will be related to whether the final product is qualified or not, and whether it will cause a production accident; in the course of telemedicine surgery, a hesitation may also cause operational deviation and cause a medical accident.
▲Delay sensitivity and data rate requirements vary by 5G use case
From Forrester's "IoT Case Requirements will meet your 5G requirements" report, "Delay sensitivity and data rate requirements vary by 5G use case" chart, in 5G commercial applications, in addition to medical In the field of high speed and time delay, in the field of automatic driving, factory automation, remote control, the delay requirement is actually higher than the speed, and the low delay is the key to whether the above application can really land.
However,Up to now, this real ace low latency of 5G has not officially entered the stage of adding vitality to all walks of life. Since the 5G network is still in the R15 stage, the global operators are still focusing on the eMBB scene. However, the relevant low-latency business trials under the R16 phase have already begun. For example, China Mobile, Huawei, and the People's Liberation Army General Hospital have completed the first 5G-based remote Parkinson's disease “brain pacemaker”. "Implantation surgery; China Telecom has completed the core installation of 5G communication system in the smart factory of Changxing Nuoli Intelligent Equipment Co., Ltd.; South Korea also recently announced plans to establish the world's first automatic driving test field based on 5G network in Seoul.
Maybe in 2020, 5G’s real trump card “low latency” will unveil more veil, and then it will be able to honor every practitioner’s phrase “5G The slogan of electric energy, leading the new round of industrial revolution.