Tiangong Internet

Tiangong connects to Earth via China's Tianlian relay satellite system - a constellation of 7 operational satellites in geostationary orbit. The station achieves 1.2 Gbps downlink speed via K-band, with sub-second latency. Taikonauts use Huawei phones, Lenovo ThinkPads, and tablets running Kylin OS, connected to an onboard WiFi network that routes through the Tianlian relays.

Yes, on paper. Tiangong's Tianlian-2 relay satellites provide 1.2 Gbps downlink, compared to the ISS's 600 Mbps via TDRS (Ku-band). However, the ISS has also demonstrated 1.2 Gbps via the ILLUMA-T laser terminal. Both stations rely on geostationary relay satellites for their primary links. China has not disclosed per-crew bandwidth or many operational details, so a direct comparison of practical speeds is difficult.

Yes. Taikonauts use WeChat for video calls with family and have conducted multiple live broadcasts from the station, including the famous 'Tiangong Class' live lectures broadcast to millions of students. They have access to email, online TV, and private communications. China has also delivered the 'Wukong AI' assistant to the station via the Tianzhou-9 cargo mission in July 2025.

China has built a fully independent space communication infrastructure: the Tianlian relay constellation (comparable to NASA's TDRS), the CDSN ground stations (comparable to NASA's DSN), and the Queqiao lunar relay satellites (no NASA equivalent yet for the lunar far side). While smaller than NASA's networks, China's systems are newer, rapidly expanding, and completely independent of Western infrastructure.

Tianlian ('Sky Link') is China's data relay satellite system, equivalent to NASA's TDRS. It consists of two generations: Tianlian-1 (5 launched, 2 still active) and Tianlian-2 (5 launched, all active). The second-generation satellites use K-band frequencies achieving 1.2 Gbps throughput and can track multiple targets simultaneously. Two new Tianlian-2 satellites were launched in quick succession in March and April 2025.