Blockchain-Based Task Offloading for Mobile Edge Computing Networks with Server Collaboration

Multi-server collaboration offloading refers to one kind of task offloading mechanism that can balance the workloads of edge servers (ESs) and reduce the waste of computing resources in mobile edge computing (MEC) systems. However, few previous works have investigated the reliability of ESs during collaboration. To solve this issue, we design a blockchain-based task offloading scheme for MEC systems with server collaboration, in which the blockchain is employed to evaluate and manage the offloading reliability of ESs. In addition, we model a transaction queue to describe the long-term dynamic process of verifying transactions in the blockchain and utilize the age of information (AoI) to describe the freshness of offloading reliability. We consider the mutual influence between the MEC and the blockchain, instead of making decisions separately. By jointly optimizing the task offloading and the blockchain consensus, the utility of ESs can be enhanced. Finally, the simulation experiments are implemented to demonstrate the effectiveness of our proposed scheme for mobile edge computing.