Release date：2021-12-28Author source：KinghelmViews：426
The heavy rain in Henan affects everyone's heart.
Yesterday, a notification text message from China Mobile to temporarily resume communication instantly refreshed the screen:
I was moved by everyone's concern, and also felt the strength of the country's scientific and technological strength.
Moved, emotionally remembered. Let's talk from a technical point of view, this emergency communication operation is very good!
How did the pterosaur recover public network communication?
Let’s take a look at the original text of the official news:
This is the Wing Loong UAV dispatched by the Emergency Management Department of China Mobile. It has traveled thousands of miles, and has traveled through 3 theaters and 4 provinces. It has traveled 1,200 kilometers for a long distance, and has performed a 16-hour flight. It arrived in Gongyimi, Henan Province. In Hezhen, the emergency network signal coverage has been completed, which strongly supports the flood control command, dispatch and exchange of information, so that the people in the disaster area can report safety.
China Mobile Chengdu Research Institute, together with Guizhou Company and Henan Company, quickly formed a joint team, ... and all relevant personnel urgently assembled to complete the preparations for the aerospace base station and the satellite communication backhaul link.
At 6:00 a.m. on July 22, the high-altitude base station of the UAV completed the communication support task and returned smoothly.
The Wing Loong large-scale long-endurance UAV emergency communication system uses large fixed-wing UAVs to carry China Mobile wireless communication base stations, adopts the China Mobile emergency communication coverage model algorithm, adopts 4G/5G communication technology, and transmits through satellites.
In the wireless communication (4G, 5G) we use every day, its base stations rely on optical cables to transmit data to the core network.
The heavy rain caused failures such as interruption of optical cables and power outages of large-scale base stations, forming a "communication interruption area".
At this time, only emergency communication methods can be used. Common emergency communication methods include:
Satellite communication: Satellite communication is limited by handheld terminal equipment, and ordinary people generally do not have satellite communication terminal equipment. Satellite communication terminals are commonly equipped on ships.
maritime satellite phone
Emergency communication vehicle: It is the most common emergency communication equipment, like a mobile base station, which is mainly used to solve the communication capacity problem of large-scale activities. The car will definitely not be able to get through this rainstorm.
emergency communication vehicle
UAV emergency communication: The protagonist of today's topic has gradually developed in recent years, mainly due to the great development of UAV technology.
Wing Loong UAV
From the official notification, the principle of this communication has been basically described:
The Wing Loong UAV is equipped with 4G/5G base station equipment.
The backhaul of the wireless base station equipment on the aircraft adopts the satellite link.
Satellite to ground station, transmission to mobile 4/5G core network.
This emergency communication plan has been drilled in October last year. This time it is considered a successful actual combat:
How good is this emergency communication disaster relief?
Domestic UAV emergency communication is mainly developed and integrated by China Mobile. It is in charge of China Mobile Chengdu Research Institute.
Last year, Leshan City suffered a "once in a century" flood disaster. China Mobile (Chengdu) Industry Research Institute used 5G network-connected drones to play a great role in emergency rescue, post-disaster reconstruction, and helping restore normal production and living order. effect.
You can look at the picture above carefully, the aircraft used at that time dragged a "tail". Using a "tethered drone"
And this time to help Henan, a more advanced "fixed-wing UAV" was used.
These are different from the drones that everyone uses to take pictures and videos every day.
At present, the comparison of several UAV platforms is shown in the following figure:
Tethered UAVs use tethered cables to supply power to UAVs and base station equipment for a long time, increasing the length of stay in the air, but also losing flight flexibility.
How tethered drones work
This time, it was difficult for tethered drones to enter and use the super flood in Henan. They sent a big killer, the pterosaur fixed-wing drone.
Thousands of miles long run
Not limited by special disaster environment (no fear of power failure and circuit break)
Long-term (5 hours) communication guarantee
The appearance of drone + communication is heartwarming and shocking.
Follow-up drone + 5G, there are many application scenarios: inspection, disaster relief, performances, plant protection and so on. I believe it will continue to attract everyone's attention.
If you are interested in the topic of UAV + communication, you can pay more attention to China Mobile Chengdu Research Institute.
On July 2, 2021, China Mobile Cheng R&D just issued a bid for "China Mobile (Chengdu) Information and Communication Technology Co., Ltd. 2021-2022 Unmanned Aerial Vehicles, UAV Warehouses and Supporting Equipment Demand Projects First Batch_Comparison Announcement" , to purchase a large number of drones:
Technology changes and helps life. This time, I want to give a like to China Mobile and the Chengdu Research Institute of China Mobile!
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