To conduct studies on Resolution 763 (WRC-15) “Stations on board sub-orbital vehicles”, a team from China academy of launch vehicle technology (CALT), along with state radio regulation of China and Beijing Institute of Tracking and Telecommunications Technology, participates in the cycle of WRC-19, and formulates technical report as “Radiocommunications for suborbital vehicles”. Considering actual technical approaching of China’s suborbital vehicle modes, the team proposes possible spectrum criteria fulfilling the requirements of whole-period communication coverage, large Doppler shift and Doppler acceleration, and overcoming communication blackout. The agenda item is the first time for CALT to participate in international telecommunication standardization work, which brings new challenges for China’s aerospace radiocommunication requirements when commercializing at global level. This agenda item is discussed during WRC-19, anticipating for future further studies on radiocommunication regulatory, operations and services, technically ensuring stations on board suborbital vehicles shall be operated within the frameworks of ITU regulations.