On October 15, the Bohai Sea Communication and Sensing Network independently developed and constructed by my country was officially put into operation, with a comprehensive signal coverage rate of 95% and a 5G network coverage rate of over 80%. It will provide high-speed, stable and reliable broadband communication and real-time sensing services for various sea-related activities to ensure water safety.
The Bohai Sea is an important navigable area in northern my country. There are not only fish but also "nets" here. Do you know this net?
There are no telephone poles on the sea, where does the signal come from?
Land base stations rely on tower optical fiber, but such conditions are not available at sea.
The Bohai Sea has more than 300 oil platforms, and 48 of them were selected for the project. 5G base stations are set up on the platforms and the original submarine optical cables of the platforms are used to transmit signals back to the land. It is like building "maritime service areas" on the sea, and ships can access the Internet when they enter the coverage area.
Why choose 700MHz "golden frequency band"?
Transmits far: A single base station can cover up to 40 kilometers at sea. The high-frequency solution requires 15 base stations, and the 700MHz solution only requires 2, saving a lot of construction costs;
Penetrating: with longer wavelength and strong diffraction ability, signals can also be received in blocked locations such as ship cabins;
Stable and power-saving: with small signal loss and low equipment power consumption, it can not only meet the needs of mobile phone Internet access, but also support the work of various monitoring sensors at sea for a long time, adapting to the needs of the vast sea surface.
5G, VHF, AIS, and hydrological observation stations, how do these systems work together?
Compare this communication perception network to a person:
AIS is the eye, reporting the ship's position, speed, and heading in real time;
VHF is the mouth and ears, enabling ship-to-shore and ship-to-ship intercom, and one-click calling in case of danger;
5G is an information highway, supporting Internet access, video calls, and monitoring screen backhaul;
The hydrological observation station is the skin, monitoring tide levels, currents, and water temperatures 24 hours a day, and sensing changes in the marine environment.
In addition to making calls online, what other value does this network have?
People’s livelihood level:
No longer lost when taking a boat, about 5 million passengers on the Liao-Shandong route every year can report safety at any time during the voyage;
It is safer for fishermen to go to sea, and they can receive weather warnings and quickly call for help when in danger;
The quality and efficiency of offshore platform operations are improved, and monitoring and production data are transmitted back to land in real time.
In terms of safety and security, in the past, the central part of the Bohai Sea was a communication blind spot. Ships were "invisible and responded to calls", making search and rescue difficult. AIS base stations now cover 95% of the sea area, enabling real-time monitoring of ship dynamics; eight VHF base stations ensure that emergency calls go directly to the traffic control center; 5G enables video and location backhaul, and precise rescue dispatch; virtual navigation beacons delineate sea lanes, and commercial and fishing vessels sail in separate lanes to reduce collisions. This is not a showpiece, but a real livelihood project, and a clairvoyant and helpful ear to protect the safety of navigation in the Bohai Sea.
