Communication method between terminal and satellite and terminal

An embodiment of the invention relates to a communication method between a terminal and a satellite and the terminal. The method comprises the following steps: determining a derating performance indexof the terminal matched with the transmission frequency and bandwidth of a reverse uplink; determining a signal system parameter of the reverse uplink of the terminal according to the derating performance index; and sending a signal carrying data information to the satellite according to the signal system parameter. Thus, combination of terrestrial communication of the terminal and satellite communication as well as switching between terrestrial communication and satellite communication can be achieved. 本发明实施例涉及种终端与卫星间的通信方法以及终端，所述方法包括：确定与反向上行链路的发射频率和带宽相匹配的终端的降额性能指标；根据所述降额性能指标确定所述终端反向上行链路的信号体制参数；根据所述信号体制参数向卫星发送携带有数据信息的信号。由此，可以实现终端在陆地通信与卫星通信的结合以及陆地通信与卫星通信之间的模式切换。