The present disclosure relates to a communication apparatus with multiple antenna sets installed on the radio interface between the communication apparatus and on-land base station, and a mobility method for the communication apparatus. In some embodiments, the communication apparatus may include a first antenna and a second antenna separated with a distance; and a digital unit connected to the first and second antennas and configured to support at least one backhaul context with the first antenna and at least another backhaul context with the second antenna at the same time.