  This paper studies the offloading service improvement of multi-access edge
computing (MEC) based on backscatter communication (BackCom) assisted
non-orthogonal multiple access (BAC-NOMA). A hybrid BAC-NOMA protocol is
proposed, where the uplink users backscatter their tasks by leveraging the
downlink signal, and then the remaining data is transmitted through uplink
NOMA. In particular, a resource allocation problem is formulated to minimize
the offloading delay of uplink users. The non-convex problem is transformed
into a convex problem, and an iterative algorithm is developed accordingly.
Simulation results show that the proposed protocol outperforms the benchmark in
terms of offloading delay.
