Mobile cloud computing (MCC) is a new technology that has been developed to overcome the restrictions of smart mobile devices (e. g. battery, processing power, storage capacity, etc. ) to send a part of the program (with complex computing) to the cloud server (CS). In this paper, we study a multi-cell with multi-input and multi-output (MIMO) system in which the cell-interior users request service for their processing from a common CS. Also, the problem of the optimum offloading is considered as an optimization problem with optimization parameters including COMMUNICATION resources (such as bandwidth, transmit power and backhaul link capacity) and computational resources (such as the capacity of cloud server) in the downlink network. The main goal is to minimize the total energy consumption by mobile users (MUs) for processing with the delay limitation for each use. This issue leads to a non-convex problem and to solve the problem, we use successive convex approximation (SCA) method. We finally show that the joint optimization of these parameters leads to reducing the energy consumption of the network with simulation examples.

Due to the explosion of smart devices, data traffic over CELLULAR networks has seen an exponential rise in recent years. This increase in mobile data traffic has caused an immediate need for offloading traffic from operators. Device-to-Device (D2D) COMMUNICATION is a promising solution to boost the capacity of CELLULAR networks and alleviate the heavy burden on backhaul links. However, direct wireless connections between devices in D2D COMMUNICATION are vulnerable to certain security threats. In this paper, we propose an incentive-aware lightweight secure data sharing scheme for D2D COMMUNICATION. We have considered the major security challenges of the data sharing scheme, including data confidentiality, integrity, detecting message modification, and preventing the propagation of malformed data. We have also applied an incentive mechanism to motivate users involvement in the process of data sharing. Actually, D2D COMMUNICATION is highly dependent on user participation in sharing content, so, we apply the concept of âAIvirtual checkâAI to motivate users (named proxy users) to help the requesting user (client) in the process of obtaining the data. Unlike the previous studies, our proposed protocol is an stateless protocol and does not depend on the userâAZs contextual information. Therefore, it can be used at anytime and from anywhere. The security analysis proves that the proposed protocol resists the security attacks and meets the security requirements. The performance evaluation shows that the proposed protocol outperforms the previous works in terms of COMMUNICATION and computation cost. Thus, the proposed protocol is indeed an efficient and practical solution for secure data sharing in D2D COMMUNICATION.