Parameter	Explanation
${\phi }_i$	Required CPU cycles to complete the computation of user i
${\eta }_i$	Energy consumption per unit CPU cycle
$D_i$	The computation quantity of user i
$F_i^g$	The amount of resources allocated by the BS g to user i
$f_i^j$	The amount of resources allocated by the UAV j to user i
$M_i^g$	Resource pricing of BS g to user i
$M_j^g$	Pricing of UAV j employed by BS g
$m_i^j$	Resource pricing of UAV j to user i
$Nee{d}_i^g$	Whether user i chooses to offload to BS g
$Nee{d}_i^j$	Whether user i chooses to offload to UAV j
$Rol{e}_i^j$	Whether UAV j is a relay when dealing with the task of user i