Have you ever experienced these frustrations?
Driving through the magnificent Northwest, your mobile signal suddenly disappears~
✈ Flying at an altitude of 10,000 meters, unable to send messages~
Vacationing by the sea, suddenly losing internet connection and missing important notifications~
⚡ A disaster strikes suddenly, communication is interrupted, and you lose contact with family and friends~
Don't worry. A future communication architecture named the [Integrated Space-Air-Ground Network] is quietly taking shape. It will completely break geographical limitations and make signals ubiquitous!
Integrated Space-Air-Ground: A Seamlessly Covered Communication Network
- Air: Utilizing airborne platforms as network nodes or relays, mainly including High-Altitude Platform Stations (HAPS) and low-altitude Unmanned Aerial Vehicle (UAV) networks. It works in coordination with "Space" (satellites) and "Ground" (terrestrial networks) to jointly form a globally covered and seamlessly connected communication network.
- Space: Geostationary satellites at an altitude of 36,000 kilometers and thousands of small satellites in low Earth orbit jointly weave a space communication network.
- Ground: Seamlessly integrating terrestrial cellular networks with satellite communications and high-altitude platforms (UAVs) to build a three-dimensional communication network covering the globe.
- Integration: Deep integration of satellite networks and terrestrial networks, with unified scheduling and seamless switching!
In the Integrated Space-Air-Ground Network, satellites may contain part or all of the access network, or even core network functions. The bearer network can be further divided into a "space bearer network" and a "terrestrial bearer network".
- The terrestrial bearer network remains the main body for service bearing, providing ubiquitous connection services with high bandwidth and low latency. As a coverage supplement and extension of the terrestrial network, the space bearer network provides supplementary connections in under-covered areas and highly reliable backup connections.
The space bearer network and the terrestrial bearer network will jointly form a heterogeneous converged network, supporting backhaul connections between the terrestrial access network and the space access network to the terrestrial core network and the space core network.
The terrestrial bearer network is connected to the satellite-based space bearer network through gateway stations, jointly achieving integrated satellite-terrestrial transmission by coordinating satellite links and terrestrial links. The operational status of satellite links is collected and fed back to the ground-based unified control plane in real time. Based on the ground-based unified control plane, the orchestration, scheduling, and management of network resources and paths are completed, achieving end-to-end performance optimization for integrated space-air-ground bearing.
While inheriting the existing 5G mobile backhaul network architecture, the terrestrial bearer network also needs to be responsible for the connection between terrestrial gateway stations and satellite operation control centers. Since some ToB (To Business) satellite services and satellite operation control information have high requirements for security isolation, the terrestrial bearer network needs to consider adopting private network or dedicated line networking to ensure end-to-end high reliability. For example, as a terrestrial bearer network, SPN (Slicing Packet Network) configures dedicated slices for satellite terrestrial backhaul services and satellite operation and control commands.
The space bearer network is composed of single-layer or multi-layer satellite networks, which may include Low Earth Orbit (LEO) satellite networks, Medium Earth Orbit (MEO) satellite networks, and High Earth Orbit (HEO) satellite networks. Each satellite will be equipped with transmission network elements to achieve inter-satellite physical communication connections, as well as networking routing and protection functions. Different satellites within the same constellation are connected through intra-orbit/inter-orbit inter-satellite communication links, while different constellations can be interconnected through inter-constellation communication links.
Major Upgrade in Satellite Communication: The Rise of LEO Satellites
Traditional geostationary satellites have weak signals and high latency. The new generation of Low Earth Orbit (LEO) satellites (only 300-2,000 kilometers from Earth) have obvious advantages:
Low latency: Video calls and online games are smoother (latency within 50 milliseconds, comparable to terrestrial networks).
Large capacity: Meets the access needs of massive users.
Broad coverage: Oceans, deserts, skies, and polar regions have no signal dead zones!
Satellite-Terrestrial Integration: The Aerial Partners of 5G/6G
5G/6G are not exclusive to the ground; they are closely joining hands with satellites:
- Signal relay: When your mobile phone leaves the terrestrial coverage area (such as the open ocean or deep mountains), the signal automatically switches to the satellite link, ensuring uninterrupted calls and internet access.
- Capacity enhancement: When the terrestrial network is congested during large events (concerts, sports events), satellites share the traffic pressure.
- Emergency support: When disasters destroy terrestrial base stations, the satellite network quickly restores critical communications.
- Space and air coverage: In the future, airplanes and high-speed railways will become stable network spaces, and high-altitude, high-speed internet access will become the norm.
6G Vision: Towards True Ubiquitous Connectivity
In the 6G era, "integrated space and ground" is the core! Satellite networks will be more deeply integrated into the 6G architecture:
- Build a three-dimensional fully covered communication network. Support ultra-low latency applications such as autonomous driving and remote surgery. Achieve global Internet of Things (IoT) and empower a smart earth.
The Future is Here: The Life Scene of Integrated Space-Air-Ground
- Self-driving tour enthusiasts: Full-process navigation and worry-free live streaming when crossing uninhabited areas. Business people: High-definition video conferences on transoceanic flights.
- Fishermen/Scientific expedition members: Real-time communication in the far sea, with safety guaranteed. Emergency disaster relief: The life channel is never interrupted.
- Smart agriculture: Full monitoring of Internet of Things (IoT) devices in vast farmlands.
- Autonomous driving: Vehicles in remote areas can still achieve high-precision positioning and navigation.
The Integrated Space-Air-Ground Network is not only a technological upgrade but also a ladder for the progress of civilization. From the peak of Mount Everest to the deep-sea trenches, from bustling cities to uninhabited deserts, this all-encompassing network will eventually bridge the digital divide, allowing humanity to truly embrace the era of ubiquitous global connectivity.