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Benefiting from the convenience of aerial flying, unmanned aerial vehicles (UAVs) can provide linear accessibility and dynamic adjusted coverage scheme to ground users, thus promising to act as removable base stations (BSs). Therefore, it necessitates the UAVs to work as a group or team and cooperate with each other, since the embedded computational and energy resources of UAVs lead to relevantly limited coverage range. In typical UAV groups, neighboring UAVs can create connections, forming a dynamic local network, to which UAVs are encouraged to stay connected due to the limited gateway resources. The connection form and networking mode of UAVs group have the characteristics of graph, which can help improve the group performance. Connections bring information sharing while the dynamic characteristics of the connections make the network topology changing with the UAVs' moving. Taking …