Chinese engineers have successfully developed the world’s first satellite that enables smartphones to make calls directly, without the need for ground-based basic stations. This groundbreaking technology is designed for emergency use, particularly in situations where mobile communication may be disrupted due to natural disasters or other crises.
The idea for such a satellite came about after a devastating earthquake struck Sichuan province in 2008, resulting in a tragic loss of over 80,000 lives. Communication breakdowns during the disaster hampered rescue efforts, highlighting the need for a more reliable communication system.
In response, the Chinese government initiated the Tiantong project, a satellite communication system aimed at providing universal access to communication services for all, regardless of social status.
Over the past 16 years, significant advancements have been made in satellite communication technology as part of the Tiantong project. The first satellite in the Tiantong-1 series was launched in 2016, followed by two more in 2020 and 2021. Together, they have formed a network in geosynchronous orbit at an altitude of 36,000 km, covering the entire Asia-Pacific region.
Last year, Huawei Technologies introduced the world’s first smartphone capable of making satellite calls that are compatible with the Tiantong satellites. Other Chinese smartphone manufacturers such as Xiaomi, Honor, and Oppo also introduced similar models. The products have been well-received by Chinese consumers, with industry estimates suggesting that Huawei alone has sold tens of millions of units, surpassing the customer base of the Starlink system, which has over 2 million users globally.
One of the main technical challenges associated with using satellites for mobile phone communication was passive intermodulation (PIM), which interfered with technology development. Chinese scientists made a breakthrough by reducing PIM effects, leading to the development of new suppression methods and advanced detection technologies.
The Tiantong project underscores China’s leadership in satellite communications technology and its commitment to addressing crucial challenges in the aerospace industry. China’s extensive patents in this field also ensure that local high-tech companies have access to cutting-edge technologies, protecting them from potential patent restrictions or sanctions from Western powers.