Optimal Multi-access Computation Offloading for Mobile Blockchain

摘要

Blockchain has emerged as a decentralized and trustable ledger for recording and storing digital transactions. The mining process of blockchain, however, requires to consume heavy computation-resources to solve the proof-of-work puzzle, which is prohibitive from the perspective of the conventional mobile terminals (MTs). In this work, we investigate the mobile edge computing (MEC) assisted Blockchain, in which a group of MTs exploit MEC to enhance their computing-powers for solving the proof-of-work puzzle. In particular, we consider the recent advanced multiple-access MEC (MA-MEC) which enables each MT to acquire the computing-powers from several edge servers (ESs) simultaneously. We formulate a joint optimization problem which aims at maximizing the total reward of all MTs, while keeping the fairness among the MTs. Despite the non-convexity of the problem, we propose efficient layered algorithms to compute the optimal solution. Extensive numerical results have been provided to validate the efficiency of our proposed algorithms.